{"gene":"NKX2-1","run_date":"2026-04-29T11:37:56","timeline":{"discoveries":[{"year":1990,"finding":"TTF-1 (NKX2-1) was identified as a thyroid nuclear factor containing a homeodomain with sequence homology to the Drosophila NK-2 homeodomain; the protein binds to promoters of thyroid-specific genes and its mRNA/binding activity is detected in thyroid and lung, with chromosomal localization to human chromosome 14 and mouse chromosome 12.","method":"cDNA cloning, DNA-binding assays with nuclear extracts, chromosomal mapping","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — original cloning and biochemical characterization with DNA-binding validation, foundational paper with >499 citations","pmids":["1976511"],"is_preprint":false},{"year":1992,"finding":"TTF-1 binds to three specific sites (A, B, C) in the bovine thyroglobulin gene promoter as revealed by DNase I footprinting; mutations reducing TTF-1 binding at A, B, and C sites also decreased promoter activity in transfection assays in primary thyrocytes, demonstrating that TTF-1 binding is functionally required for thyroglobulin gene transcription.","method":"DNase I footprinting, site-directed mutagenesis, transient transfection assays in primary dog thyrocytes","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — in vitro footprinting combined with mutagenesis and functional promoter assays","pmids":["1555648"],"is_preprint":false},{"year":1993,"finding":"The NMR structure of the rat TTF-1 homeodomain (TTF-1 HD) was determined, revealing three helices arranged in a helix-turn-helix motif similar to other homeodomains, consistent with its DNA-binding function.","method":"500 MHz 1H NMR spectroscopy, standard 2D NMR methodology, secondary structure determination","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — NMR structural determination with full spectral assignment","pmids":["8282100"],"is_preprint":false},{"year":1994,"finding":"The conformational stability of the TTF-1 homeodomain was characterized; it has a Tm of 42°C and low Gibbs free energy of stabilization (~1.3–1.4 kcal/mol), indicating it is a mobile, flexible segment folded into loose helices, and small reductions in alpha-helical content significantly modify DNA-binding activity.","method":"Circular dichroism-monitored thermal denaturation and urea unfolding, DNA-binding activity assays","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1 — biophysical characterization, single lab, single study","pmids":["7957942"],"is_preprint":false},{"year":1995,"finding":"The DNA-binding specificity of the TTF-1 homeodomain preferentially recognizes sequences with the 5'-CAAG-3' core motif, but also binds a wider spectrum of sequences; the 5'-CAAG-3' core is necessary but not sufficient for maximal binding affinity.","method":"TTF-1 HD-Sepharose column chromatography, sequential selection and amplification of binding sequences (SELEX-like), binding activity measurement","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro biochemical selection with binding quantification, single lab","pmids":["7654238"],"is_preprint":false},{"year":1995,"finding":"TTF-1 activates transcription of the human surfactant protein B (SP-B) gene through an upstream enhancer element (−439 to −331 bp); three TTF-1 binding sites in this region were identified, purified TTF-1 homeodomain binds this region, co-transfection of TTF-1 transactivates the SP-B promoter, and mutation of TTF-1 binding sites blocks both binding and transactivation.","method":"Deletion analysis, luciferase reporter assays, co-transfection, purified TTF-1 binding assays, site-directed mutagenesis of binding sites","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted binding with purified protein, mutagenesis, functional reporter assays","pmids":["7559607"],"is_preprint":false},{"year":1995,"finding":"The human NKX2-1/TTF-1 gene was characterized as a single locus spanning ~3.3 kb with two exons and a single intron, encoding a 371 amino acid protein highly conserved with rat TTF-1 (98% identity); the 5'-flanking region directs lung epithelial cell-selective transcription; TTF-1 protein is localized to nuclei of fetal lung epithelial cells from 11 weeks gestation and postnatally in type II epithelial cells and bronchiolar epithelial subsets.","method":"Gene cloning and sequencing, immunohistochemistry, luciferase reporter transfection assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — gene structure determination combined with promoter activity assays and immunolocalization, foundational characterization paper","pmids":["7713914"],"is_preprint":false},{"year":1998,"finding":"The human Nkx2.1 gene is organized into three exons and two introns (revising previous reports of two exons); a newly identified exon I contains an ATG codon in-frame with a previously identified initiator codon on the 5E transcript, and in vitro transcription/translation of this 5E cDNA produces a 44 kDa polypeptide; at least two independent regions (within intron 1 and 5' of exon 1) may mediate basal promoter activity in lung epithelial cells.","method":"cDNA cloning, genomic cloning, sequencing, Northern blot analysis, in vitro transcription/translation, promoter activity assays","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 — gene structure revision with functional promoter mapping, single lab","pmids":["9545595"],"is_preprint":false},{"year":1999,"finding":"Nkx2.1 is required for septation of the anterior foregut into trachea and esophagus; homozygous Nkx2.1-null mouse embryos fail to form separate tracheal and esophageal structures, develop profoundly hypoplastic lungs that fail normal branching morphogenesis, and lack pulmonary surfactant protein gene expression; reduced Bmp-4 expression in mutant lung epithelium was identified as a possible mechanistic clue for impaired branching.","method":"Targeted gene disruption (knockout mice), in situ hybridization for Bmp-4 and Vegf, histological analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function mouse model with defined morphogenetic and molecular phenotypes, replicated finding, >357 citations","pmids":["10208743"],"is_preprint":false},{"year":2000,"finding":"The two NKX2.1 protein isoforms (371 aa and 401 aa) are functionally distinct: the longer isoform (401 aa, encoded by a transcript including all three exons) exhibits reduced transcriptional activity on an SP-C target promoter compared to the truncated major isoform; the 30 amino acid N-terminal extension likely acts by steric interference, as demonstrated by site-directed mutagenesis.","method":"Differential expression analysis of transcripts, transactivation reporter assays, site-directed mutagenesis of the 30 aa extension","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — functional assays with mutagenesis, single lab","pmids":["10753648"],"is_preprint":false},{"year":2000,"finding":"Distal lung morphogenesis (but not proximal) is strictly dependent on Nkx2.1; Nkx2.1-null lungs show significantly reduced or absent expression of alpha-integrins and collagen type IV (unlike laminin which is maintained), and exhibit predominant Vegf1/reduced Vegf3 expression typical of tracheobronchial epithelium, indicating Nkx2.1 controls the epithelial phenotype required for distal morphogenesis.","method":"Analysis of Nkx2.1(-/-) embryos, immunohistochemistry/in situ hybridization for ECM proteins, integrins, and Vegf isoforms","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function mouse model with molecular pathway analysis, single lab","pmids":["10706142"],"is_preprint":false},{"year":2000,"finding":"Oncogenic Ras represses TTF-1 transcriptional activity through multiple downstream pathways; the Raf/MEK/ERK cascade directly phosphorylates TTF-1 at three serine residues, and mutation of these serines to alanines abolishes ERK-mediated phosphorylation in vitro and in vivo; a second ERK-independent pathway (activated by V12N38 Ras) also partially represses TTF-1 activity, and combined activation of both pathways nearly completely abolishes TTF-1 function.","method":"Transient transfection assays with Ras effector mutants, activated Raf expression, MEK inhibitors (U0126, PD98059), in vitro kinase assay (ERK phosphorylates TTF-1), in vivo phosphorylation analysis, site-directed mutagenesis of serine residues","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — direct in vitro kinase assay combined with mutagenesis and in vivo phosphorylation confirmation","pmids":["10733581"],"is_preprint":false},{"year":2002,"finding":"TTF-1 directly interacts with and synergistically activates transcription with Pax8; GST-Pax8 pull-down captures TTF-1 from thyroid and non-thyroid cell extracts, direct interaction is confirmed using bacterially purified TTF-1, and co-immunoprecipitation demonstrates in vivo interaction in thyroid cells; co-expression in HeLa cells synergistically activates thyroglobulin gene transcription requiring the N-terminal activation domain of TTF-1 and C-terminal domain of Pax8.","method":"GST pull-down with purified proteins, co-immunoprecipitation, transactivation reporter assays, deletion analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct interaction confirmed with purified proteins and co-IP in vivo, functional synergy demonstrated","pmids":["12441357"],"is_preprint":false},{"year":2002,"finding":"NKX2-1 haploinsufficiency in humans (heterozygous loss-of-function mutations including deletions, missense, and nonsense mutations) causes a triad of congenital hypothyroidism, choreoathetosis/muscular hypotonia, and pulmonary problems, establishing NKX2-1 as required for thyroid, basal ganglia, and lung development and function in humans.","method":"Clinical phenotyping, gene sequencing, identification of heterozygous loss-of-function mutations in five patients","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple independent mutations with consistent clinical phenotype, corroborated by mouse model, >246 citations","pmids":["11854319"],"is_preprint":false},{"year":2002,"finding":"Heterozygous deletion of the mouse Ttf1 gene (haploinsufficiency) results in predominantly neurological phenotype (poor coordination) and elevated serum thyrotropin, demonstrating that TTF1 haploinsufficiency is sufficient to produce neurological and thyroid axis defects; a mutant human TTF1 (insertion into codon 86) fails to bind its cis-element or transactivate a thyroglobulin promoter reporter, and does not interfere with wild-type TTF1, confirming haploinsufficiency as the mechanism.","method":"Heterozygous Ttf1 knockout mouse analysis, reporter gene transactivation assay with mutant vs. wild-type TTF1, competition assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 — mechanistic validation in both human mutation analysis and mouse genetic model","pmids":["11854318"],"is_preprint":false},{"year":2002,"finding":"TTF-1, GATA6, and Foxa2 directly bind to specific consensus sites within the WNT7b promoter (demonstrated by EMSA) and cooperatively transactivate WNT7b expression in lung epithelial cells; TTF-1 and GATA6 physically interact in vivo and synergistically activate the minimal TTF-1-containing WNT7b promoter region.","method":"Electrophoretic mobility shift assay (EMSA), transfection/transactivation assays, truncation mutagenesis of GATA6/Foxa2 binding sites, co-immunoprecipitation (TTF-1 and GATA6 in vivo interaction)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — EMSA binding, functional reporter assays with mutations, and in vivo co-IP all in same study","pmids":["11914369"],"is_preprint":false},{"year":2002,"finding":"Mutations in TITF-1 (NKX2-1) are associated with benign hereditary chorea (BHC); a de novo 1.2 Mb deletion harboring TITF-1 was identified in a BHC family, and further TITF-1 mutations in additional BHC families were described, establishing NKX2-1 loss-of-function as the genetic cause of this dominantly inherited movement disorder.","method":"Linkage analysis, genomic deletion mapping, mutation screening by sequencing","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — genetic evidence in multiple families with confirmed mutations, >160 citations","pmids":["11971878"],"is_preprint":false},{"year":2003,"finding":"In Nkx2.1-null mice, ascending dopaminergic axons from mesencephalic DA cells aberrantly cross the ventral midline and project to the contralateral striatum instead of remaining ipsilateral; this is associated with loss of neuroepithelium in the ventromedial hypothalamus of the third ventricle and markedly reduced expression of semaphorin 3A (and previously reported slit2), indicating that NKX2-1 maintains chemorepulsive axon guidance cues in the hypothalamus.","method":"Tyrosine hydroxylase immunostaining in Nkx2.1(-/-) embryos, DiI axon tracing, immunohistochemistry for semaphorin 3A","journal":"Experimental neurology","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with axon tracing and molecular marker analysis, single lab","pmids":["12821380"],"is_preprint":false},{"year":2003,"finding":"Nkx2.1 and Gsh2 act cooperatively (not through cross-repression) in patterning the ventral telencephalon; however, Gsh2 expression in the MGE after E10.5 may negatively regulate Nkx2.1-dependent oligodendrocyte specification, revealing both integrative and antagonistic interactions in telencephalic patterning.","method":"Double-mutant mouse analysis, loss- and gain-of-function genetic experiments, histological/marker analysis","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis in double mutants, single lab","pmids":["12930780"],"is_preprint":false},{"year":2003,"finding":"TTF-1 directly regulates PACAP gene transcription in the hypothalamus: the TTF-1 homeodomain binds six of seven putative binding sites in the PACAP 5'-flanking region; TTF-1 dose-dependently activates the PACAP promoter in C6 glioma cells; deletion of the TTF-1 binding motif at −369 abolishes transactivation; intracerebroventricular antisense TTF-1 oligodeoxynucleotide reduces hypothalamic PACAP mRNA in vivo; TTF-1 and PACAP show coordinated daily oscillations in the rat hypothalamus.","method":"DNA-binding assays, transactivation reporter assays, deletion mutagenesis, in vivo antisense knockdown, RNase protection assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro binding, functional promoter assay with mutagenesis, and in vivo validation by antisense knockdown","pmids":["12122016"],"is_preprint":false},{"year":2003,"finding":"TTF-1 regulates angiotensinogen gene transcription in the rat subfornical organ: TTF-1 mRNA co-localizes with angiotensinogen-producing cells; both mRNAs increase simultaneously upon water deprivation; TTF-1 dose-dependently transactivates the angiotensinogen promoter in C6 glioma cells; deletion of the TTF-1 binding motif at −125 abolishes transactivation; in vivo intracranial antisense TTF-1 oligodeoxynucleotide reduces angiotensinogen mRNA and causes decreased water intake and plasma vasopressin.","method":"Double in situ hybridization, RNase protection assays, reporter gene transactivation with deletion analysis, in vivo antisense knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro binding with functional mutagenesis, in vivo antisense validation","pmids":["12730191"],"is_preprint":false},{"year":2004,"finding":"TAZ (transcriptional co-activator with PDZ-binding motif) directly interacts with TTF-1 and synergistically activates SP-C expression; pull-down experiments demonstrated direct TAZ–TTF-1 interaction; mammalian two-hybrid assays and pull-down experiments mapped TAZ binding to the NH2-terminal domain of TTF-1; co-expression of TAZ and TTF-1 synergistically activated mouse SP-C-luciferase reporter constructs.","method":"Mammalian two-hybrid assay, pull-down experiments, co-transfection luciferase reporter assays, immunolocalization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — direct interaction mapped by pull-down with domain deletion, functional synergy demonstrated, replicated in thyroid (2008 paper)","pmids":["14970209"],"is_preprint":false},{"year":2004,"finding":"In vivo promoter analysis of the baboon Nkx2.1 5'-flanking region revealed that proximal and distal promoter fragments direct LacZ expression to brain (including hypothalamus) and two of three fragments direct tracheal epithelial-specific expression in transgenic mice, but parenchymal lung and thyroid expression was not conferred, demonstrating that cis-elements for tracheal vs. lung morphogenesis are distinct and thyroid-directing elements are absent from the tested ~4 kb region.","method":"BAC/transgene constructs with LacZ reporter, transgenic mouse analysis at E15 and E18","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo promoter analysis in transgenic mice, single lab","pmids":["15094193"],"is_preprint":false},{"year":2006,"finding":"Sonic hedgehog (Shh) maintains Nkx2.1 expression in the MGE during neurogenesis to specify interneurons, but unlike its initial induction of Nkx2.1 (which requires antagonizing Gli3 repressor formation), the Nkx2.1 maintenance function of Shh does not require blocking Gli3R formation, revealing two mechanistically distinct Shh-dependent steps in Nkx2.1 regulation.","method":"Genetic mouse models (Shh conditional mutants, Gli3 mutants), immunohistochemistry, in situ hybridization","journal":"Cerebral cortex","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis in mouse models, single lab","pmids":["16766713"],"is_preprint":false},{"year":2006,"finding":"Conditional deletion of Ttf1 from differentiated neurons causes delayed puberty, reduced reproductive capacity, and a short reproductive span associated with reduced hypothalamic expression of genes required for sexual development, without affecting basal ganglia morphology or function; TTF1 expression in the nonhuman primate hypothalamus increases at puberty, indicating a postdevelopmental role in neuroendocrine control of reproduction.","method":"Conditional Ttf1 neuronal knockout mice, gene expression profiling, reproductive phenotyping, extrapyramidal function testing","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — conditional knockout with defined reproductive phenotype, single lab","pmids":["17182767"],"is_preprint":false},{"year":2008,"finding":"Nkx2.1 is required for the temporal specification of cortical interneuron subtypes: conditional removal of Nkx2.1 at distinct neurogenic time points causes a switch in interneuron subtypes produced, demonstrating a causal link between Nkx2.1 expression in progenitors and the functional identity of their neuronal progeny.","method":"Conditional loss-of-function mouse genetics (Cre-mediated deletion at different developmental timepoints), interneuron subtype marker analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with temporal resolution, specific phenotypic readout, >260 citations","pmids":["18786356"],"is_preprint":false},{"year":2008,"finding":"Postmitotic Nkx2-1 controls interneuron migration by directly repressing the guidance receptor Neuropilin-2: downregulation of Nkx2-1 in postmitotic cells is required for cortical migration while maintenance is required for striatal migration; Nkx2-1 directly regulates Neuropilin-2 expression, which enables interneurons to invade the striatum.","method":"Conditional loss-of-function mouse genetics, in utero electroporation, interneuron migration assays, ChIP/reporter assays for Neuropilin-2 direct regulation","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1–2 — direct transcriptional target identification combined with genetic migration assays, >192 citations","pmids":["18786357"],"is_preprint":false},{"year":2008,"finding":"TAZ acts as a coactivator for both Pax8 and TTF-1 in thyroid cells: TAZ is present in the nucleus of differentiated thyroid cells; TAZ physically interacts with both Pax8 and TTF-1 in vitro and in vivo; this interaction significantly enhances transcriptional activity on the thyroglobulin promoter, suggesting TAZ modulates thyroid-specific gene expression.","method":"Co-immunoprecipitation (in vitro and in vivo), cotransfection reporter assays, immunofluorescence co-localization","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP and functional synergy, single lab, extends prior TAZ-TTF-1 findings to thyroid context","pmids":["19010321"],"is_preprint":false},{"year":2009,"finding":"Five new NKX2-1 mutations causing brain-lung-thyroid syndrome were characterized; functional analysis revealed that three missense mutations (L176V, P202L, Q210P) cause loss of transactivation capacity on the thyroglobulin enhancer/promoter; notably, deficient transcriptional activity of NKX2-1-P202L was completely rescued by co-transfected wild-type PAX8, whereas synergism was abolished by L176V and Q210P mutations, identifying a PAX8-NKX2-1 functional interaction critical for thyroid gene regulation.","method":"Mutation identification by sequencing, in vitro transactivation assays, co-transfection rescue experiments with PAX8","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — functional assays with multiple mutations and co-transfection rescue, mechanistically informative","pmids":["19336474"],"is_preprint":false},{"year":2009,"finding":"NKX2-1 directly regulates RET transcription in coordination with Phox2b and Sox10: dual-luciferase reporter studies showed Nkx2-1 works cooperatively with Phox2b and Sox10 (but not Pax3) to activate the RET promoter; HSCR-associated SNPs at the NKX2-1 binding site reduce NKX2-1 binding and abolish synergistic transactivation of RET by HOXB5 and NKX2-1.","method":"Dual-luciferase reporter assays, immunohistochemistry for PHOX2B in human gut, SNP functional analysis","journal":"Journal of pediatric surgery","confidence":"Medium","confidence_rationale":"Tier 2–3 — reporter assays with multiple factors, single lab","pmids":["19853745"],"is_preprint":false},{"year":2009,"finding":"TGF-beta inhibits lung endodermal morphogenesis partly through reduction of NKX2.1 protein and its downstream target surfactant protein C; this requires TGFbeta receptor II and is partially dependent on Smad3/Smad4 signaling; increased Pten expression accounts for TGFbeta's anti-proliferative effects but is not sufficient to restore morphogenesis, indicating NKX2.1 is an independent mediator of morphogenetic TGFbeta signaling.","method":"Mesenchyme-free embryonic lung endoderm explant model, conditional knockout mice (Smad3(-/-), Smad4Δ/Δ, TGFbetaRII conditional KO, Pten conditional KO), BrdU proliferation assays, protein/mRNA analysis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple genetic models with defined molecular readouts, single lab","pmids":["18602626"],"is_preprint":false},{"year":2009,"finding":"TTF-1 inhibits TGF-beta-mediated epithelial-to-mesenchymal transition (EMT) in lung adenocarcinoma cells: TTF-1 expression down-regulates TGF-beta target genes including EMT regulators Snail and Slug; silencing TTF-1 enhances TGF-beta-mediated EMT; TTF-1 down-regulates TGF-beta2 production and TGF-beta conversely decreases TTF-1 expression, creating a reciprocal regulatory loop.","method":"TTF-1 overexpression and siRNA knockdown in lung adenocarcinoma cells, EMT marker analysis, invasion assays, gene expression analysis","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal regulation demonstrated with gain- and loss-of-function, defined molecular phenotype, replicated findings","pmids":["19293183"],"is_preprint":false},{"year":2011,"finding":"NKX2-1 controls tumor differentiation and limits metastatic potential in lung adenocarcinoma in part by repressing the embryonically restricted chromatin regulator Hmga2; gain- and loss-of-function experiments showed Nkx2-1 negativity is pathognomonic of high-grade poorly differentiated tumors, and Nkx2-1 constrains malignant progression through Hmga2 repression.","method":"Lentiviral mouse lung adenocarcinoma model, gain- and loss-of-function experiments in tumor cell lines, in vivo transplant experiments, gene expression analysis, functional complementation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal in vivo and in vitro approaches with functional complementation, >387 citations","pmids":["21471965"],"is_preprint":false},{"year":2011,"finding":"NKX2-1 is amplified as a lineage-specific oncogene in lung cancer; siRNA-mediated knockdown of NKX2-1/TITF1 in lung cancer cell lines with amplification reduces cell proliferation through decreased cell-cycle progression and increased apoptosis.","method":"Genomic profiling of 128 lung cancer cell lines/tumors, siRNA knockdown, cell proliferation and apoptosis assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA knockdown with defined cellular phenotype, single lab","pmids":["18212743"],"is_preprint":false},{"year":2011,"finding":"Continuous expression of Nkx2-1 is essential for the maturation and maintenance of cholinergic basal forebrain neurons: prenatal deletion of Nkx2-1 in GAD67-expressing neurons causes nearly complete loss of cholinergic and parvalbumin-positive GABAergic neurons in the basal forebrain; postnatal deletion in choline acetyltransferase-expressing cells also causes a striking reduction in cholinergic neuron number, with partial denervation of target structures and discrete spatial memory impairment.","method":"Two conditional knockout mouse lines (prenatal GAD67-Cre, postnatal ChAT-Cre), cell counting, denervation analysis, spatial memory behavioral testing","journal":"The European journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — two complementary conditional KO strategies with defined cellular and behavioral phenotypes, single lab","pmids":["22098391"],"is_preprint":false},{"year":2011,"finding":"HOXB5 physically interacts with NKX2-1 as a protein complex and synergistically mediates RET expression; HOXB5 binds the RET promoter region 5' upstream of the NKX2-1 binding site; HSCR-associated SNPs at the NKX2-1 binding site abolish this synergistic transactivation; in contrast, HOXB5 cooperates only additively with SOX10, PAX3, and PHOX2B.","method":"ChIP, luciferase reporter assays, co-immunoprecipitation of HOXB5-NKX2-1 complex, SNP functional analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and co-IP combined with functional assays, single lab","pmids":["21677782"],"is_preprint":false},{"year":2012,"finding":"NKX2-1 induces expression of the receptor tyrosine kinase ROR1, which sustains a prosurvival PI3K-AKT/p38 signaling balance in lung adenocarcinoma through ROR1 kinase-dependent c-Src activation and kinase-independent maintenance of EGFR-ERBB3 association, ERBB3 phosphorylation, and PI3K activation; ROR1 knockdown inhibits lung adenocarcinoma cell lines including those with EGFR inhibitor resistance.","method":"NKX2-1 gain-of-function, ROR1 siRNA knockdown, signaling pathway analysis (PI3K-AKT, p38, Src, ERBB3), cell line proliferation/apoptosis assays","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 — defined downstream pathway with mechanistic dissection of kinase-dependent and independent functions, multiple cell lines","pmids":["22439932"],"is_preprint":false},{"year":2012,"finding":"Nkx2-1 haploinsufficiency combined with oncogenic Kras(G12D) causes mucinous pulmonary adenocarcinoma in transgenic mice; NKX2-1 directly associates with AP-1 binding elements and canonical NKX2-1 binding elements at genes induced in mucinous tumors (identified by ChIP-seq); NKX2-1 inhibits AP-1 activity and tumor colony formation in vitro, demonstrating context-dependent tumor suppressor activity against Kras-driven mucinous tumors.","method":"Transgenic mouse models (Nkx2-1 haploinsufficiency + Kras(G12D)), ChIP with massively parallel DNA sequencing (ChIP-seq), AP-1 reporter assays, colony formation assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP-seq genome-wide binding combined with functional in vitro and in vivo assays","pmids":["23143308"],"is_preprint":false},{"year":2013,"finding":"MiR-365 directly regulates NKX2-1 protein levels in lung cancer; ectopic miR-365 expression decreased NKX2-1 expression in lung cancer cell lines, reduced cell proliferation, and NKX2-1 overexpression overcame the suppressive effect of miR-365, placing miR-365 as an upstream post-transcriptional regulator of NKX2-1.","method":"miR-365 mimic/inhibitor transfection, NKX2-1 overexpression, cell proliferation assays","journal":"Cancer letters","confidence":"Low","confidence_rationale":"Tier 3 — single lab, single method without direct 3'UTR binding validation","pmids":["23507558"],"is_preprint":false},{"year":2014,"finding":"mTOR inhibition promotes TTF-1-dependent redifferentiation of thyroid carcinoma cells and increases iodine uptake; this redifferentiation is not mediated by autophagy or inflammation but through transcriptional upregulation of TTF-1; siRNA inhibition of TTF-1 completely abrogates mTOR inhibition-induced sodium-iodine symporter expression, placing TTF-1 as the key downstream mediator of mTOR-dependent thyroid differentiation.","method":"mTOR inhibitor treatment of thyroid carcinoma cell lines, siRNA knockdown of TTF-1, iodine uptake assays, mRNA/protein expression analysis","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA rescue experiment identifying TTF-1 as essential downstream mediator, single lab","pmids":["24712572"],"is_preprint":false},{"year":2015,"finding":"Nkx2-1-derived glia (astrocytes and polydendrocytes) are required for proper formation of the anterior commissure; selective cell ablation showed synergistic roles of Nkx2-1-derived GABAergic interneurons and astroglia in AC formation; Nkx2-1-regulated cells mediate anterior commissure axon guidance through expression of the repellent cue Slit2.","method":"Fate mapping, selective cell ablation strategy, Slit2 expression analysis, Nkx2.1 lineage tracing","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — cell ablation with defined axon guidance phenotype linked to Slit2, single lab","pmids":["25904499"],"is_preprint":false},{"year":2015,"finding":"Loss of Foxa2 and Cdx2 synergizes with loss of Nkx2-1 to fully activate the metastatic program in lung adenocarcinoma; knockdown of all three factors synergistically promotes metastatic potential; this is sufficient to upregulate invadopodia component Tks5long, Hmga2, and Snail, accounting for a significant fraction of gene expression differences between non-metastatic and metastatic states.","method":"Knockdown of Foxa2, Cdx2, and Nkx2-1 alone and in combination; in vivo metastasis assays; gene expression analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — systematic combinatorial knockdown with in vivo metastasis assays and transcriptomic validation, multiple orthogonal approaches","pmids":["26341558"],"is_preprint":false},{"year":2016,"finding":"NKX2-1 controls regional identity and, together with LHX6, is necessary to specify pallidal projection neurons and forebrain interneurons; genome-wide chromosomal binding analysis showed NKX2-1 binding at distal regulatory elements leads to repressed epigenetic state and transcriptional repression in the ventricular zone, while NKX2-1 is also required to establish permissive chromatin and transcriptional activation in the sub-ventricular and mantle zones; combinatorial binding of NKX2-1 and LHX6 promotes permissive chromatin and activates genes in cortical migrating interneurons.","method":"ChIP-seq for NKX2-1 binding, ATAC-seq for chromatin state, RNA-seq for gene expression, conditional knockout analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1–2 — integrated multi-omics with genetic validation, context-dependent dual activator/repressor function established","pmids":["27657450"],"is_preprint":false},{"year":2018,"finding":"Selenbp1 is a direct transcriptional target of Nkx2-1 in lung adenocarcinoma: Nkx2-1 is required and sufficient for Selenbp1 expression; Selenbp1 and Nkx2-1 function in a positive feedback loop (Selenbp1 stabilizes Nkx2-1 protein); Selenbp1 inhibits clonal growth and migration in vitro, suppresses metastasis in an in vivo transplant model, and its CRISPR/Cas9 inactivation enhances primary tumor growth in autochthonous models.","method":"Loss- and gain-of-function experiments, CRISPR/Cas9 Selenbp1 knockout, in vivo transplant and autochthonous mouse models, ChIP-seq for direct NKX2-1 binding","journal":"Molecular cancer research","confidence":"High","confidence_rationale":"Tier 1–2 — direct target identification by ChIP-seq, functional validation by CRISPR KO and transplant models, positive feedback loop established","pmids":["30002193"],"is_preprint":false},{"year":2021,"finding":"NKX2-1 loss in BRAFV600E-driven lung adenocarcinoma leads to invasive mucinous adenocarcinoma with gastric differentiation; BRAF/MEK inhibitors drive NKX2-1-positive tumor cells into quiescence but fail to induce cell cycle exit in NKX2-1-negative cells; BRAF/MEK inhibitors induce cell identity switching within the gastric lineage in NKX2-1-negative tumors driven partly by WNT signaling and FoxA1/2, revealing a reciprocal NKX2-1/ERK/WNT feedback loop modulating gastric identity.","method":"Genetically engineered mouse models (BRAFV600E with/without NKX2-1), BRAF/MEK inhibitor treatment, cell cycle analysis, WNT pathway manipulation, FoxA1/2 expression analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — in vivo GEMM with pharmacological intervention and pathway dissection, multiple orthogonal approaches","pmids":["33821796"],"is_preprint":false},{"year":2021,"finding":"NKX2-1 positively expresses in deep-layer neocortical neurogliaform cells (ID2+Nkx2.1+ cells) that are active during the down state of non-REM sleep; optogenetic activation of ID2+Nkx2.1+ interneurons in the posterior parietal cortex during NREM sleep interferes with consolidation of cue discrimination memory, demonstrating a physiological role for this NKX2-1-expressing interneuron type in memory consolidation.","method":"Single-cell electrophysiology, immunohistochemistry, optogenetic activation of ID2+Nkx2.1+ cells, memory consolidation behavioral assays","journal":"Nature neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — optogenetic manipulation with behavioral readout, single lab","pmids":["33619404"],"is_preprint":false},{"year":2021,"finding":"CRISPRi-mediated functional analysis of NKX2-1 binding sites revealed that a subset of NKX2-1-binding sites are functionally indispensable while others are dispensable for target gene expression (genes including SFTPB, LAMP3, SFTPA1, SFTPA2, MYBPH, LMO3, CD274/PD-L1); this demonstrates unequal functional roles of NKX2-1 binding sites across proximal and distal genomic regions.","method":"CRISPRi (CRISPR/dCas9-KRAB), ChIP-seq, gene expression analysis of 19 NKX2-1-binding regions","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 — systematic CRISPRi screen of binding sites with gene expression readout, single lab","pmids":["33980985"],"is_preprint":false},{"year":2022,"finding":"FoxA1/2 loss leads to aberrant NKX2-1 activity and genomic relocalization in NKX2-1-positive LUAD; loss of FoxA1/2 collapses a dual pulmonary/gastrointestinal transcriptional identity state, and aberrant NKX2-1 activity actively inhibits tumorigenesis and drives alternative cellular identity programs associated with non-proliferative states.","method":"Foxa1/2 conditional knockout in KRAS-driven mouse models, human cell lines, NKX2-1 ChIP-seq to assess genomic relocalization, transcriptomics","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP-seq showing genomic relocalization, multiple genetic models in vivo and in vitro","pmids":["35835117"],"is_preprint":false},{"year":2023,"finding":"NKX2-1 directly binds and transcriptionally upregulates serine/glycine synthesis enzyme genes (PHGDH, PSAT1, PSPH, SHMT1/2), driving serine/glycine synthesis addiction in T-cell leukemia and lung cancer cells; NKX2-1-driven serine/glycine synthesis generates nucleotides and redox molecules, alters the cellular lipidome and methylome, and NKX2-1-expressing cells show enhanced sensitivity to serine/glycine conversion inhibition by sertraline.","method":"ChIP-qPCR for direct NKX2-1 binding to enzyme gene promoters, NKX2-1 overexpression/knockout models, mass spectrometry metabolomics, proliferation/invasion assays, mouse tumor models","journal":"British journal of cancer","confidence":"High","confidence_rationale":"Tier 1–2 — direct ChIP binding combined with metabolomics, in vivo validation, and therapeutic relevance","pmids":["36932191"],"is_preprint":false},{"year":2024,"finding":"NKX2-1 directly restricts expression of CXCL1, CXCL2, and CXCL5 chemokines in lung adenocarcinoma cells as revealed by ATAC-seq showing NKX2-1 occupancy at their promoters; NKX2-1 depletion triggers CXCL secretion that recruits tumor-promoting neutrophils via CXCR2 signaling, increasing tumor growth that is reversed by CXCR2 antagonist SB225002.","method":"ATAC-seq for chromatin accessibility at CXCL promoters, chemokine array, qRT-PCR, NKX2-1 knockdown in LUAD cells, syngeneic mouse model, single-cell RNA-seq, CXCR2 antagonist treatment","journal":"Advanced science","confidence":"High","confidence_rationale":"Tier 1–2 — ATAC-seq chromatin evidence of direct regulation combined with in vivo mouse model and single-cell sequencing","pmids":["39113226"],"is_preprint":false}],"current_model":"NKX2-1 (TTF-1) is a homeodomain transcription factor that binds DNA via a NK-2-type homeodomain (preferentially recognizing 5'-CAAG-3' motifs), is phosphorylated and repressed by the Ras/Raf/MEK/ERK cascade, physically interacts with co-factors including TAZ, PAX8, GATA6, Foxa2, HOXB5, and LHX6 to cooperatively regulate tissue-specific gene expression, directly activates surfactant protein genes (SP-B, SP-C), WNT7b, PACAP, angiotensinogen, and serine/glycine synthesis enzymes, while repressing CXCL chemokines, Hmga2, and EMT-driving genes; in the developing lung and forebrain it controls morphogenesis, interneuron specification, and migration via direct repression of guidance receptors (Neuropilin-2), and in lung adenocarcinoma functions as a context-dependent lineage-survival oncogene and tumor suppressor whose genomic localization and activity are modulated by FoxA1/2 and whose loss activates CXCR2-dependent neutrophil recruitment and metastatic programs."},"narrative":{"teleology":[{"year":1990,"claim":"Identification of TTF-1 as a homeodomain-containing thyroid/lung nuclear factor established a new tissue-specific transcription factor family and placed NKX2-1 at the intersection of thyroid and pulmonary gene regulation.","evidence":"cDNA cloning, DNA-binding assays with thyroid nuclear extracts, chromosomal mapping to human chr14","pmids":["1976511"],"confidence":"High","gaps":["No in vivo loss-of-function data","DNA-binding specificity not yet defined at nucleotide level","Lung function of TTF-1 not yet demonstrated"]},{"year":1993,"claim":"Structural and biophysical characterization of the TTF-1 homeodomain revealed a canonical helix-turn-helix fold with unusual conformational flexibility, linking structural dynamics to DNA-binding activity.","evidence":"NMR structure determination and CD-monitored thermal/urea unfolding of recombinant TTF-1 homeodomain","pmids":["8282100","7957942"],"confidence":"High","gaps":["No co-crystal structure with DNA","Structural basis for target gene selectivity unknown"]},{"year":1995,"claim":"Definition of the 5'-CAAG-3' core binding motif and demonstration that TTF-1 directly transactivates the surfactant protein B gene extended TTF-1 function from thyroid to pulmonary epithelial gene regulation.","evidence":"SELEX-based binding site selection; reporter assays with site-directed mutagenesis of SP-B enhancer TTF-1 sites in lung cells","pmids":["7654238","7559607"],"confidence":"High","gaps":["Genome-wide binding landscape unknown","Mechanism of tissue-selective activation (thyroid vs. lung) not resolved"]},{"year":1999,"claim":"Nkx2.1-null mice revealed an essential non-redundant role in foregut septation, distal lung morphogenesis, and surfactant gene expression, establishing NKX2-1 as a master regulator of lung development.","evidence":"Targeted gene disruption in mice; histological and molecular analysis of null embryos showing tracheoesophageal and pulmonary defects","pmids":["10208743","10706142"],"confidence":"High","gaps":["Downstream transcriptional network in lung morphogenesis largely uncharacterized","Mechanism linking NKX2-1 to Bmp-4 regulation not established"]},{"year":2000,"claim":"Discovery that the Ras/Raf/MEK/ERK cascade directly phosphorylates TTF-1 at three serine residues to repress its activity identified a key post-translational regulatory axis, connecting oncogenic signaling to loss of differentiated function.","evidence":"In vitro ERK kinase assay, in vivo phosphorylation analysis, serine-to-alanine mutagenesis abolishing phosphorylation, MEK inhibitor rescue","pmids":["10733581"],"confidence":"High","gaps":["Identity of ERK-independent Ras pathway repressing TTF-1 not resolved","Structural basis for phosphorylation-mediated repression unknown"]},{"year":2002,"claim":"Identification of NKX2-1 loss-of-function mutations in patients with brain-lung-thyroid syndrome and benign hereditary chorea established NKX2-1 haploinsufficiency as the genetic cause of a multi-organ developmental disorder, validated by heterozygous knockout mice.","evidence":"Mutation screening in BHC and congenital hypothyroidism families; heterozygous Ttf1 knockout mouse phenotyping; functional assays showing loss of DNA binding and transactivation","pmids":["11854319","11854318","11971878"],"confidence":"High","gaps":["Genotype-phenotype correlations for specific mutations incomplete","Mechanism of selective basal ganglia vulnerability unknown"]},{"year":2002,"claim":"Demonstration of direct physical interactions between TTF-1 and co-factors PAX8, GATA6, and FoxA2 on thyroid and lung target promoters (thyroglobulin, WNT7b) revealed the combinatorial transcriptional logic underlying tissue-specific gene activation.","evidence":"GST pull-down with purified proteins, co-immunoprecipitation, EMSA, cooperative transactivation assays on thyroglobulin and WNT7b promoters","pmids":["12441357","11914369"],"confidence":"High","gaps":["Structural basis of TTF-1–PAX8 interaction unknown","Relative contributions of each co-factor in vivo not dissected"]},{"year":2004,"claim":"Identification of TAZ as a direct co-activator of TTF-1 binding through the N-terminal domain provided a mechanistic link between Hippo pathway effectors and NKX2-1-dependent transcription in lung and thyroid.","evidence":"Mammalian two-hybrid, pull-down domain mapping, cooperative SP-C and thyroglobulin reporter activation","pmids":["14970209","19010321"],"confidence":"High","gaps":["Whether TAZ modulates NKX2-1 chromatin occupancy genome-wide untested","In vivo requirement for TAZ–NKX2-1 interaction not demonstrated genetically"]},{"year":2008,"claim":"Conditional knockout studies demonstrated that Nkx2-1 controls temporal specification and migration of cortical interneurons by directly repressing the guidance receptor Neuropilin-2, establishing a postmitotic transcriptional switch governing neuronal fate and migration.","evidence":"Temporally controlled conditional KO in mouse MGE progenitors; ChIP and reporter assays for Neuropilin-2; in utero electroporation migration assays","pmids":["18786356","18786357"],"confidence":"High","gaps":["Full set of NKX2-1 direct targets in postmitotic interneurons not catalogued","Mechanism of Nkx2-1 downregulation in cortex-destined interneurons unknown"]},{"year":2011,"claim":"Identification of NKX2-1 as both a lineage-survival oncogene (when amplified) and a metastasis suppressor (through Hmga2 repression) resolved its paradoxical dual role in lung adenocarcinoma and established the concept of context-dependent lineage transcription factor activity in cancer.","evidence":"Lentiviral mouse LUAD model with gain/loss-of-function; siRNA knockdown in amplified cell lines; Hmga2 rescue experiments; genomic profiling of 128 tumors","pmids":["21471965","18212743"],"confidence":"High","gaps":["Mechanism by which NKX2-1 amplification switches from tumor-suppressive to oncogenic function incompletely defined","Patient-level biomarker validation of NKX2-1 status for prognosis limited"]},{"year":2012,"claim":"ChIP-seq revealed genome-wide NKX2-1 occupancy at AP-1 elements in mucinous lung tumors and demonstrated that NKX2-1 haploinsufficiency with Kras activation drives mucinous adenocarcinoma, establishing the mechanistic basis of NKX2-1's tumor-suppressive activity against Kras-driven mucinous differentiation.","evidence":"ChIP-seq in Nkx2-1 haploinsufficient/Kras(G12D) mouse models; AP-1 reporter inhibition assays; colony formation assays","pmids":["23143308"],"confidence":"High","gaps":["Whether NKX2-1 directly sequesters AP-1 or modulates its chromatin access unclear","Therapeutic strategies to restore NKX2-1 function not explored"]},{"year":2016,"claim":"Integrated ChIP-seq and ATAC-seq in the developing forebrain revealed that NKX2-1 acts as a dual-function chromatin regulator — repressing genes by closing chromatin in the ventricular zone while activating genes via permissive chromatin together with LHX6 in migrating interneurons — resolving how a single factor achieves context-dependent transcriptional outcomes.","evidence":"NKX2-1 ChIP-seq, ATAC-seq, RNA-seq in developing mouse forebrain, conditional KO validation","pmids":["27657450"],"confidence":"High","gaps":["Cofactors mediating repressive vs. activating mode in brain not fully identified","Whether this dual chromatin mechanism operates similarly in lung and thyroid untested"]},{"year":2022,"claim":"FoxA1/2 were shown to direct NKX2-1 genomic localization; their loss causes aberrant NKX2-1 redistribution that paradoxically inhibits tumorigenesis, establishing that pioneer factor availability dictates NKX2-1's oncogenic versus tumor-suppressive output.","evidence":"Conditional Foxa1/2 knockout in Kras-driven mouse LUAD; NKX2-1 ChIP-seq showing genomic relocalization; transcriptomics in mouse and human cells","pmids":["35835117"],"confidence":"High","gaps":["Which chromatin features recruit relocalized NKX2-1 unknown","Whether therapeutic modulation of FoxA1/2 can redirect NKX2-1 activity untested"]},{"year":2023,"claim":"NKX2-1 was found to directly activate serine/glycine biosynthesis enzyme genes, revealing an unexpected metabolic programming function that creates a therapeutically exploitable metabolic vulnerability in NKX2-1-expressing cancers.","evidence":"ChIP-qPCR for NKX2-1 at PHGDH/PSAT1/PSPH/SHMT promoters; metabolomics; sertraline sensitivity assays in lung cancer and T-ALL models","pmids":["36932191"],"confidence":"High","gaps":["Whether metabolic reprogramming contributes to NKX2-1's developmental functions unknown","Clinical validation of sertraline sensitivity in NKX2-1-positive tumors lacking"]},{"year":2024,"claim":"NKX2-1 was shown to directly repress CXCL chemokines, and its loss triggers CXCR2-dependent neutrophil recruitment that promotes tumor growth, connecting NKX2-1 loss to immune microenvironment remodeling in lung adenocarcinoma.","evidence":"ATAC-seq showing NKX2-1 occupancy at CXCL promoters; NKX2-1 knockdown in syngeneic mouse LUAD; scRNA-seq; CXCR2 antagonist rescue","pmids":["39113226"],"confidence":"High","gaps":["Whether NKX2-1 regulates other immune cell populations beyond neutrophils untested","Interaction between NKX2-1-mediated immune control and checkpoint immunotherapy unknown"]},{"year":null,"claim":"Key unresolved questions include the structural basis for NKX2-1's context-dependent activator/repressor switching, the full catalog of cofactors determining its mode in each tissue, and whether its metabolic and immune-regulatory functions contribute to developmental morphogenesis beyond cancer.","evidence":"","pmids":[],"confidence":"High","gaps":["No co-crystal structure of NKX2-1 with DNA or cofactors","Comprehensive comparison of NKX2-1 cistrome across lung, thyroid, and brain in matched conditions lacking","Therapeutic strategies to restore NKX2-1 function in NKX2-1-loss tumors not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,2,4,5]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,5,12,15,19,20,21,32,42,48,49]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,6,21,27]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,5,12,15,19,42,46]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[8,10,25,26]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11,30,36,44]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[32,33,37,41,47,49]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[17,25,26,34,45]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[49]}],"complexes":[],"partners":["PAX8","TAZ","GATA6","FOXA2","HOXB5","LHX6","FOXA1"],"other_free_text":[]},"mechanistic_narrative":"NKX2-1 (TTF-1) is a homeodomain transcription factor that serves as a master regulator of lineage identity in the lung, thyroid, and forebrain, coordinating morphogenesis, cell-type specification, and differentiated gene expression programs. It binds DNA via an NK-2-type homeodomain preferring 5'-CAAG-3' core motifs and directly activates surfactant protein genes (SP-B, SP-C), thyroglobulin, WNT7b, PACAP, angiotensinogen, ROR1, RET, and serine/glycine biosynthetic enzymes, while repressing Hmga2, CXCL chemokines, Neuropilin-2, and EMT-driving genes through context-dependent recruitment of co-factors including PAX8, TAZ, GATA6, FoxA1/2, LHX6, and HOXB5 [PMID:1976511, PMID:7559607, PMID:12441357, PMID:14970209, PMID:27657450, PMID:39113226]. Its transcriptional activity is negatively regulated by Ras/Raf/MEK/ERK-mediated phosphorylation at three serine residues and by TGF-β signaling, and its genomic occupancy is redirected upon loss of pioneer factors FoxA1/2 [PMID:10733581, PMID:18602626, PMID:35835117]. Heterozygous loss-of-function mutations cause brain-lung-thyroid syndrome (congenital hypothyroidism, choreoathetosis, and pulmonary disease) and benign hereditary chorea, while in lung adenocarcinoma NKX2-1 functions as a context-dependent lineage-survival oncogene when amplified and a tumor suppressor whose loss unleashes metastatic programs, mucinous differentiation, and CXCR2-dependent neutrophil recruitment [PMID:11854319, PMID:11971878, PMID:21471965, PMID:23143308, PMID:39113226]."},"prefetch_data":{"uniprot":{"accession":"P43699","full_name":"Homeobox protein Nkx-2.1","aliases":["Homeobox protein NK-2 homolog A","Thyroid nuclear factor 1","Thyroid transcription factor 1","TTF-1","Thyroid-specific enhancer-binding protein","T/EBP"],"length_aa":371,"mass_kda":38.6,"function":"Transcription factor that binds and activates the promoter of thyroid specific genes such as thyroglobulin, thyroperoxidase, and thyrotropin receptor. Crucial in the maintenance of the thyroid differentiation phenotype. May play a role in lung development and surfactant homeostasis. Forms a regulatory loop with GRHL2 that coordinates lung epithelial cell morphogenesis and differentiation. Activates the transcription of GNRHR and plays a role in enhancing the circadian oscillation of its gene expression. Represses the transcription of the circadian transcriptional repressor NR1D1 (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P43699/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NKX2-1","classification":"Not Classified","n_dependent_lines":21,"n_total_lines":1208,"dependency_fraction":0.0173841059602649},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NKX2-1","total_profiled":1310},"omim":[{"mim_id":"619280","title":"COILED-COIL DOMAIN-CONTAINING PROTEIN 59; CCDC59","url":"https://www.omim.org/entry/619280"},{"mim_id":"616844","title":"DNAJ/HSP40 HOMOLOG, SUBFAMILY C, MEMBER 17; DNAJC17","url":"https://www.omim.org/entry/616844"},{"mim_id":"616741","title":"PR DOMAIN-CONTAINING PROTEIN 13; PRDM13","url":"https://www.omim.org/entry/616741"},{"mim_id":"616534","title":"THYROID CANCER, NONMEDULLARY, 4; NMTC4","url":"https://www.omim.org/entry/616534"},{"mim_id":"610978","title":"CHOREOATHETOSIS AND CONGENITAL HYPOTHYROIDISM WITH OR WITHOUT PULMONARY DYSFUNCTION; CAHTP","url":"https://www.omim.org/entry/610978"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Golgi apparatus","reliability":"Uncertain"},{"location":"Vesicles","reliability":"Uncertain"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"lung","ntpm":52.0},{"tissue":"thyroid gland","ntpm":162.9}],"url":"https://www.proteinatlas.org/search/NKX2-1"},"hgnc":{"alias_symbol":["TTF-1","TTF1"],"prev_symbol":["NKX2A","BCH","TITF1"]},"alphafold":{"accession":"P43699","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P43699","model_url":"https://alphafold.ebi.ac.uk/files/AF-P43699-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P43699-F1-predicted_aligned_error_v6.png","plddt_mean":56.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NKX2-1","jax_strain_url":"https://www.jax.org/strain/search?query=NKX2-1"},"sequence":{"accession":"P43699","fasta_url":"https://rest.uniprot.org/uniprotkb/P43699.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P43699/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P43699"}},"corpus_meta":[{"pmid":"17990269","id":"PMC_17990269","title":"Fate mapping Nkx2.1-lineage cells in the mouse telencephalon.","date":"2008","source":"The Journal of comparative neurology","url":"https://pubmed.ncbi.nlm.nih.gov/17990269","citation_count":455,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"21471965","id":"PMC_21471965","title":"Suppression of lung adenocarcinoma progression by Nkx2-1.","date":"2011","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/21471965","citation_count":387,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"10208743","id":"PMC_10208743","title":"Defects in tracheoesophageal and lung morphogenesis in Nkx2.1(-/-) mouse embryos.","date":"1999","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/10208743","citation_count":357,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12023581","id":"PMC_12023581","title":"TTF-1 expression in pulmonary adenocarcinomas.","date":"2002","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/12023581","citation_count":296,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18786356","id":"PMC_18786356","title":"The requirement of Nkx2-1 in the temporal specification of cortical interneuron subtypes.","date":"2008","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/18786356","citation_count":260,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"10895813","id":"PMC_10895813","title":"A clinicopathologic study of 100 cases of pulmonary sclerosing hemangioma with immunohistochemical studies: TTF-1 is expressed in both round and surface cells, suggesting an origin from primitive respiratory epithelium.","date":"2000","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/10895813","citation_count":251,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11854319","id":"PMC_11854319","title":"Choreoathetosis, hypothyroidism, and pulmonary alterations due to human NKX2-1 haploinsufficiency.","date":"2002","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/11854319","citation_count":246,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22439932","id":"PMC_22439932","title":"NKX2-1/TITF1/TTF-1-Induced ROR1 is required to sustain EGFR survival signaling in lung adenocarcinoma.","date":"2012","source":"Cancer cell","url":"https://pubmed.ncbi.nlm.nih.gov/22439932","citation_count":215,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18786357","id":"PMC_18786357","title":"Postmitotic Nkx2-1 controls the migration of telencephalic interneurons by direct repression of guidance receptors.","date":"2008","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/18786357","citation_count":192,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"28463226","id":"PMC_28463226","title":"Prospective isolation of NKX2-1-expressing human lung progenitors derived from pluripotent stem cells.","date":"2017","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/28463226","citation_count":188,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18212743","id":"PMC_18212743","title":"Genomic profiling identifies TITF1 as a lineage-specific oncogene amplified in lung cancer.","date":"2008","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/18212743","citation_count":175,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"17616654","id":"PMC_17616654","title":"Lineage-specific dependency of lung adenocarcinomas on the lung development regulator TTF-1.","date":"2007","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/17616654","citation_count":173,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19336474","id":"PMC_19336474","title":"Five new TTF1/NKX2.1 mutations in brain-lung-thyroid syndrome: rescue by PAX8 synergism in one case.","date":"2009","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19336474","citation_count":150,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19037882","id":"PMC_19037882","title":"Thyroid transcription factor-1 (TTF-1/Nkx2.1/TITF1) gene regulation in the lung.","date":"2009","source":"Clinical science (London, England : 1979)","url":"https://pubmed.ncbi.nlm.nih.gov/19037882","citation_count":144,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18091384","id":"PMC_18091384","title":"The diagnostic value of TTF-1, CK 5/6, and p63 immunostaining in classification of lung carcinomas.","date":"2007","source":"Applied immunohistochemistry & molecular morphology : AIMM","url":"https://pubmed.ncbi.nlm.nih.gov/18091384","citation_count":132,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"23143308","id":"PMC_23143308","title":"Kras(G12D) and Nkx2-1 haploinsufficiency induce mucinous adenocarcinoma of the lung.","date":"2012","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/23143308","citation_count":130,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"15861215","id":"PMC_15861215","title":"Variable sensitivity and specificity of TTF-1 antibodies in lung metastatic adenocarcinoma of colorectal origin.","date":"2005","source":"Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc","url":"https://pubmed.ncbi.nlm.nih.gov/15861215","citation_count":122,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18091383","id":"PMC_18091383","title":"Diagnostic value of CDX-2 and TTF-1 expressions in separating metastatic neuroendocrine neoplasms of unknown origin.","date":"2007","source":"Applied immunohistochemistry & molecular morphology : AIMM","url":"https://pubmed.ncbi.nlm.nih.gov/18091383","citation_count":109,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"27657450","id":"PMC_27657450","title":"Transcriptional Networks Controlled by NKX2-1 in the Development of Forebrain GABAergic Neurons.","date":"2016","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/27657450","citation_count":101,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12930780","id":"PMC_12930780","title":"Combinatorial function of the homeodomain proteins Nkx2.1 and Gsh2 in ventral telencephalic patterning.","date":"2003","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/12930780","citation_count":100,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"15188024","id":"PMC_15188024","title":"The role of TTF-1 in differentiating primary and metastatic lung adenocarcinomas.","date":"2004","source":"Pathology oncology research : POR","url":"https://pubmed.ncbi.nlm.nih.gov/15188024","citation_count":98,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"10706142","id":"PMC_10706142","title":"Inhibition of distal lung morphogenesis in Nkx2.1(-/-) embryos.","date":"2000","source":"Developmental dynamics : an official publication of the American Association of Anatomists","url":"https://pubmed.ncbi.nlm.nih.gov/10706142","citation_count":98,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11914369","id":"PMC_11914369","title":"The WNT7b promoter is regulated by TTF-1, GATA6, and Foxa2 in lung epithelium.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11914369","citation_count":96,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"21464700","id":"PMC_21464700","title":"Combination of napsin A and TTF-1 immunohistochemistry helps in differentiating primary lung adenocarcinoma from metastatic carcinoma in the lung.","date":"2011","source":"Applied immunohistochemistry & molecular morphology : AIMM","url":"https://pubmed.ncbi.nlm.nih.gov/21464700","citation_count":96,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11075855","id":"PMC_11075855","title":"Pulmonary sclerosing hemangioma consistently expresses thyroid transcription factor-1 (TTF-1): a new clue to its histogenesis.","date":"2000","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/11075855","citation_count":89,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"15716236","id":"PMC_15716236","title":"Usefulness of CDX2 and TTF-1 in differentiating gastrointestinal from pulmonary carcinoids.","date":"2005","source":"American journal of clinical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/15716236","citation_count":87,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"26341558","id":"PMC_26341558","title":"Foxa2 and Cdx2 cooperate with Nkx2-1 to inhibit lung adenocarcinoma metastasis.","date":"2015","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/26341558","citation_count":85,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"26829311","id":"PMC_26829311","title":"KRAS and NKX2-1 Mutations in Invasive Mucinous Adenocarcinoma of the Lung.","date":"2016","source":"Journal of thoracic oncology : official publication of the International Association for the Study of Lung Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/26829311","citation_count":76,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"15494931","id":"PMC_15494931","title":"Histopathologic classification of lung cancer: Relevance of cytokeratin and TTF-1 immunophenotyping.","date":"2004","source":"Annals of diagnostic pathology","url":"https://pubmed.ncbi.nlm.nih.gov/15494931","citation_count":67,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19010321","id":"PMC_19010321","title":"TAZ is a coactivator for Pax8 and TTF-1, two transcription factors involved in thyroid differentiation.","date":"2008","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/19010321","citation_count":65,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"33619404","id":"PMC_33619404","title":"Sleep down state-active ID2/Nkx2.1 interneurons in the neocortex.","date":"2021","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/33619404","citation_count":62,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"9545595","id":"PMC_9545595","title":"Structure of the human Nkx2.1 gene.","date":"1998","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/9545595","citation_count":59,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"16138374","id":"PMC_16138374","title":"Cytology applications of p63 and TTF-1 immunostaining in differential diagnosis of lung cancers.","date":"2005","source":"Diagnostic cytopathology","url":"https://pubmed.ncbi.nlm.nih.gov/16138374","citation_count":59,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"9601992","id":"PMC_9601992","title":"Demarcation of ventral territories by the homeobox gene NKX2.1 during early chick development.","date":"1998","source":"Development genes and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/9601992","citation_count":58,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"10733581","id":"PMC_10733581","title":"Multiple ras downstream pathways mediate functional repression of the homeobox gene product TTF-1.","date":"2000","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/10733581","citation_count":54,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"17636482","id":"PMC_17636482","title":"Napsin A (TA02) is a useful alternative to thyroid transcription factor-1 (TTF-1) for the identification of pulmonary adenocarcinoma cells in pleural effusions.","date":"2007","source":"Diagnostic cytopathology","url":"https://pubmed.ncbi.nlm.nih.gov/17636482","citation_count":53,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19853745","id":"PMC_19853745","title":"Transcriptional regulation of RET by Nkx2-1, Phox2b, Sox10, and Pax3.","date":"2009","source":"Journal of pediatric surgery","url":"https://pubmed.ncbi.nlm.nih.gov/19853745","citation_count":48,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"16766713","id":"PMC_16766713","title":"Shh maintains Nkx2.1 in the MGE by a Gli3-independent mechanism.","date":"2006","source":"Cerebral cortex (New York, N.Y. : 1991)","url":"https://pubmed.ncbi.nlm.nih.gov/16766713","citation_count":48,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"21838611","id":"PMC_21838611","title":"Diagnostic utility of PAX8, TTF-1 and napsin A for discriminating metastatic carcinoma from primary adenocarcinoma of the lung.","date":"2011","source":"Biotechnic & histochemistry : official publication of the Biological Stain Commission","url":"https://pubmed.ncbi.nlm.nih.gov/21838611","citation_count":48,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"17182767","id":"PMC_17182767","title":"Deletion of the Ttf1 gene in differentiated neurons disrupts female reproduction without impairing basal ganglia function.","date":"2006","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/17182767","citation_count":47,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"25125621","id":"PMC_25125621","title":"Evaluation of napsin A, TTF-1, p63, p40, and CK5/6 immunohistochemical stains in pulmonary neuroendocrine tumors.","date":"2014","source":"American journal of clinical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/25125621","citation_count":46,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"23507558","id":"PMC_23507558","title":"MicroRNA-365 regulates NKX2-1, a key mediator of lung cancer.","date":"2013","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/23507558","citation_count":46,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"25786084","id":"PMC_25786084","title":"Chordoid gliomas of the third ventricle share TTF-1 expression with organum vasculosum of the lamina terminalis.","date":"2015","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/25786084","citation_count":45,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12709398","id":"PMC_12709398","title":"Activation of the KATP channel-independent signaling pathway by the nonhydrolyzable analog of leucine, BCH.","date":"2003","source":"American journal of physiology. Endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/12709398","citation_count":45,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"23701182","id":"PMC_23701182","title":"Update on hypophysitis and TTF-1 expressing sellar region masses.","date":"2013","source":"Brain pathology (Zurich, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/23701182","citation_count":43,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"24171694","id":"PMC_24171694","title":"Benign hereditary chorea related to NKX2.1: expansion of the genotypic and phenotypic spectrum.","date":"2013","source":"Developmental medicine and child neurology","url":"https://pubmed.ncbi.nlm.nih.gov/24171694","citation_count":43,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12821380","id":"PMC_12821380","title":"Aberrant trajectory of ascending dopaminergic pathway in mice lacking Nkx2.1.","date":"2003","source":"Experimental neurology","url":"https://pubmed.ncbi.nlm.nih.gov/12821380","citation_count":43,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"34524427","id":"PMC_34524427","title":"SRGN-Triggered Aggressive and Immunosuppressive Phenotype in a Subset of TTF-1-Negative Lung Adenocarcinomas.","date":"2022","source":"Journal of the National Cancer Institute","url":"https://pubmed.ncbi.nlm.nih.gov/34524427","citation_count":42,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"8458846","id":"PMC_8458846","title":"Analysis of the promoter and regulatory sequences of an oxygen-regulated bch operon in Rhodobacter capsulatus by site-directed mutagenesis.","date":"1993","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/8458846","citation_count":41,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"35835117","id":"PMC_35835117","title":"FoxA1 and FoxA2 control growth and cellular identity in NKX2-1-positive lung adenocarcinoma.","date":"2022","source":"Developmental cell","url":"https://pubmed.ncbi.nlm.nih.gov/35835117","citation_count":41,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12902388","id":"PMC_12902388","title":"Dlx2 progenitor migration in wild type and Nkx2.1 mutant telencephalon.","date":"2003","source":"Cerebral cortex (New York, N.Y. : 1991)","url":"https://pubmed.ncbi.nlm.nih.gov/12902388","citation_count":39,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18754327","id":"PMC_18754327","title":"If it's not CK5/6 positive, TTF-1 negative it's not a squamous cell carcinoma of lung.","date":"2008","source":"APMIS : acta pathologica, microbiologica, et immunologica Scandinavica","url":"https://pubmed.ncbi.nlm.nih.gov/18754327","citation_count":39,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18445682","id":"PMC_18445682","title":"BNIP2 extra long inhibits RhoA and cellular transformation by Lbc RhoGEF via its BCH domain.","date":"2008","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/18445682","citation_count":38,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"24712572","id":"PMC_24712572","title":"mTOR Inhibition promotes TTF1-dependent redifferentiation and restores iodine uptake in thyroid carcinoma cell lines.","date":"2014","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/24712572","citation_count":37,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"30169783","id":"PMC_30169783","title":"Comparison of Three Different TTF-1 Clones in Resected Primary Lung Cancer and Epithelial Pulmonary Metastases.","date":"2018","source":"American journal of clinical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/30169783","citation_count":35,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"10753648","id":"PMC_10753648","title":"Two functionally distinct forms of NKX2.1 protein are expressed in the pulmonary epithelium.","date":"2000","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/10753648","citation_count":35,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"30002193","id":"PMC_30002193","title":"Tumor Suppressor Activity of Selenbp1, a Direct Nkx2-1 Target, in Lung Adenocarcinoma.","date":"2018","source":"Molecular cancer research : MCR","url":"https://pubmed.ncbi.nlm.nih.gov/30002193","citation_count":35,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"16220345","id":"PMC_16220345","title":"Nonsense mutation in TITF1 in a Portuguese family with benign hereditary chorea.","date":"2005","source":"Neurogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/16220345","citation_count":34,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19620839","id":"PMC_19620839","title":"GCDFP-15 positive and TTF-1 negative primary lung neoplasms: a tissue microarray study of 381 primary lung tumors.","date":"2009","source":"Applied immunohistochemistry & molecular morphology : AIMM","url":"https://pubmed.ncbi.nlm.nih.gov/19620839","citation_count":28,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12730191","id":"PMC_12730191","title":"TTF-1, a homeodomain-containing transcription factor, participates in the control of body fluid homeostasis by regulating angiotensinogen gene transcription in the rat subfornical organ.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12730191","citation_count":28,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"1555648","id":"PMC_1555648","title":"Functional role of TTF-1 binding sites in bovine thyroglobulin promoter.","date":"1992","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/1555648","citation_count":28,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"25904499","id":"PMC_25904499","title":"Nkx2.1-derived astrocytes and neurons together with Slit2 are indispensable for anterior commissure formation.","date":"2015","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/25904499","citation_count":27,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22383183","id":"PMC_22383183","title":"Opposite roles of FOXA1 and NKX2-1 in lung cancer progression.","date":"2012","source":"Genes, chromosomes & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/22383183","citation_count":27,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"24930029","id":"PMC_24930029","title":"A novel de novo mutation of the TITF1/NKX2-1 gene causing ataxia, benign hereditary chorea, hypothyroidism and a pituitary mass in a UK family and review of the literature.","date":"2014","source":"Cerebellum (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/24930029","citation_count":27,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"23169673","id":"PMC_23169673","title":"Choreoathetosis, congenital hypothyroidism and neonatal respiratory distress syndrome with intact NKX2-1.","date":"2012","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/23169673","citation_count":27,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22046491","id":"PMC_22046491","title":"TTF-1 positive small cell cancers: Don't think they're always primary pulmonary!","date":"2011","source":"World journal of gastrointestinal oncology","url":"https://pubmed.ncbi.nlm.nih.gov/22046491","citation_count":26,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22098391","id":"PMC_22098391","title":"The integrity of cholinergic basal forebrain neurons depends on expression of Nkx2-1.","date":"2011","source":"The European journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/22098391","citation_count":26,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"34663216","id":"PMC_34663216","title":"Overexpression of a carrot BCH gene, DcBCH1, improves tolerance to drought in Arabidopsis thaliana.","date":"2021","source":"BMC plant biology","url":"https://pubmed.ncbi.nlm.nih.gov/34663216","citation_count":25,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"21677782","id":"PMC_21677782","title":"HOXB5 cooperates with NKX2-1 in the transcription of human RET.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21677782","citation_count":25,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18602626","id":"PMC_18602626","title":"Mechanisms of TGFbeta inhibition of LUNG endodermal morphogenesis: the role of TbetaRII, Smads, Nkx2.1 and Pten.","date":"2008","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/18602626","citation_count":25,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"20660160","id":"PMC_20660160","title":"The BNIP-2 and Cdc42GAP homology (BCH) domain of p50RhoGAP/Cdc42GAP sequesters RhoA from inactivation by the adjacent GTPase-activating protein domain.","date":"2010","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/20660160","citation_count":24,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"28807344","id":"PMC_28807344","title":"Pituicytoma: Review of commonalities and distinguishing features among TTF-1 positive tumors of the central nervous system.","date":"2017","source":"Annals of diagnostic pathology","url":"https://pubmed.ncbi.nlm.nih.gov/28807344","citation_count":23,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18067638","id":"PMC_18067638","title":"Immunohistochemical expression of TTF-1 in various cytological subtypes of primary lung adenocarcinoma, with special reference to intratumoral heterogeneity.","date":"2008","source":"Pathology international","url":"https://pubmed.ncbi.nlm.nih.gov/18067638","citation_count":22,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12122016","id":"PMC_12122016","title":"Regulation of pituitary adenylate cyclase-activating polypeptide gene transcription by TTF-1, a homeodomain-containing transcription factor.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12122016","citation_count":22,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"7957942","id":"PMC_7957942","title":"Analysis of the conformation and stability of rat TTF-1 homeodomain by circular dichroism.","date":"1994","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/7957942","citation_count":22,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22710163","id":"PMC_22710163","title":"Functional plasticity of the BNIP-2 and Cdc42GAP Homology (BCH) domain in cell signaling and cell dynamics.","date":"2012","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/22710163","citation_count":22,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"33821796","id":"PMC_33821796","title":"An NKX2-1/ERK/WNT feedback loop modulates gastric identity and response to targeted therapy in lung adenocarcinoma.","date":"2021","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/33821796","citation_count":21,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"26799356","id":"PMC_26799356","title":"Utility of TTF-1 and Napsin-A in the work-up of malignant effusions.","date":"2016","source":"Diagnostic cytopathology","url":"https://pubmed.ncbi.nlm.nih.gov/26799356","citation_count":20,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22479462","id":"PMC_22479462","title":"Cross-species analyses identify the BNIP-2 and Cdc42GAP homology (BCH) domain as a distinct functional subclass of the CRAL_TRIO/Sec14 superfamily.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22479462","citation_count":20,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19011567","id":"PMC_19011567","title":"TTF-1 expression in nephroblastoma.","date":"2009","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/19011567","citation_count":20,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"24157949","id":"PMC_24157949","title":"Ldb1 is essential for development of Nkx2.1 lineage derived GABAergic and cholinergic neurons in the telencephalon.","date":"2013","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/24157949","citation_count":19,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"21555194","id":"PMC_21555194","title":"TITF-1 gene mutation in a case of sporadic non-progressive chorea. Response to levodopa treatment.","date":"2011","source":"Brain & development","url":"https://pubmed.ncbi.nlm.nih.gov/21555194","citation_count":19,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"30236546","id":"PMC_30236546","title":"The expression of TTF1, CDX2 and ISL1 in 74 poorly differentiated neuroendocrine carcinomas.","date":"2018","source":"Annals of diagnostic pathology","url":"https://pubmed.ncbi.nlm.nih.gov/30236546","citation_count":18,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"25209726","id":"PMC_25209726","title":"Expression of bkt and bch genes from Haematococcus pluvialis in transgenic Chlamydomonas.","date":"2014","source":"Science China. Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/25209726","citation_count":18,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"33980985","id":"PMC_33980985","title":"CRISPRi-mediated functional analysis of NKX2-1-binding sites in the lung.","date":"2021","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/33980985","citation_count":18,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"34170361","id":"PMC_34170361","title":"64Cu-PSMA-BCH: a new radiotracer for delayed PET imaging of prostate cancer.","date":"2021","source":"European journal of nuclear medicine and molecular imaging","url":"https://pubmed.ncbi.nlm.nih.gov/34170361","citation_count":18,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"36932191","id":"PMC_36932191","title":"Transcription factor NKX2-1 drives serine and glycine synthesis addiction in cancer.","date":"2023","source":"British journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/36932191","citation_count":17,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"7654238","id":"PMC_7654238","title":"Definition of the DNA-binding specificity of TTF-1 homeodomain by chromatographic selection of binding sequences.","date":"1995","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/7654238","citation_count":17,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"39113226","id":"PMC_39113226","title":"Neutrophils Recruited by NKX2-1 Suppression via Activation of CXCLs/CXCR2 Axis Promote Lung Adenocarcinoma Progression.","date":"2024","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/39113226","citation_count":16,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"23672829","id":"PMC_23672829","title":"Enhanced derivation of mouse ESC-derived cortical interneurons by expression of Nkx2.1.","date":"2013","source":"Stem cell research","url":"https://pubmed.ncbi.nlm.nih.gov/23672829","citation_count":16,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"21867529","id":"PMC_21867529","title":"Altered surfactant homeostasis and recurrent respiratory failure secondary to TTF-1 nuclear targeting defect.","date":"2011","source":"Respiratory research","url":"https://pubmed.ncbi.nlm.nih.gov/21867529","citation_count":16,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"25412988","id":"PMC_25412988","title":"Recurrent drop attacks in early childhood as presenting symptom of benign hereditary chorea caused by TITF1 gene mutations.","date":"2014","source":"Developmental medicine and child neurology","url":"https://pubmed.ncbi.nlm.nih.gov/25412988","citation_count":15,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"21982616","id":"PMC_21982616","title":"A novel nonsense mutation in the TITF-1 gene in a Japanese family with benign hereditary chorea.","date":"2011","source":"Journal of the neurological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/21982616","citation_count":15,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"23946985","id":"PMC_23946985","title":"Lung metastasis from TTF-1 positive sigmoid adenocarcinoma. pitfalls and management.","date":"2013","source":"Pathologica","url":"https://pubmed.ncbi.nlm.nih.gov/23946985","citation_count":14,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"15094193","id":"PMC_15094193","title":"In vivo characterization of the Nkx2.1 promoter/enhancer elements in transgenic mice.","date":"2004","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/15094193","citation_count":14,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"17640327","id":"PMC_17640327","title":"Evaluation of the thyroid transcription factor-1 gene (TITF1) as a Hirschsprung's disease locus.","date":"2007","source":"Annals of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17640327","citation_count":13,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"28286255","id":"PMC_28286255","title":"A further case of brain-lung-thyroid syndrome with deletion proximal to NKX2-1.","date":"2017","source":"European journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28286255","citation_count":13,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"8282100","id":"PMC_8282100","title":"Structural study of rat thyroid transcription factor 1 homeodomain (TTF-1 HD) by nuclear magnetic resonance.","date":"1993","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/8282100","citation_count":13,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"39377914","id":"PMC_39377914","title":"TTF-1 is a highly sensitive but not fully specific marker for pulmonary and thyroidal cancer: a tissue microarray study evaluating more than 17,000 tumors from 152 different tumor entities.","date":"2024","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/39377914","citation_count":12,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"31135446","id":"PMC_31135446","title":"The Incidence of Labelling of Non-Lung Adenocarcinomas With Antibodies Against TTF-1 and Diagnostic Implications.","date":"2020","source":"Applied immunohistochemistry & molecular morphology : AIMM","url":"https://pubmed.ncbi.nlm.nih.gov/31135446","citation_count":12,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12477932","id":"PMC_12477932","title":"Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences.","date":"2002","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/12477932","citation_count":1479,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19274049","id":"PMC_19274049","title":"A census of human transcription factors: function, expression and evolution.","date":"2009","source":"Nature reviews. Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19274049","citation_count":1191,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21873635","id":"PMC_21873635","title":"Phylogenetic-based propagation of functional annotations within the Gene Ontology consortium.","date":"2011","source":"Briefings in bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/21873635","citation_count":656,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"1976511","id":"PMC_1976511","title":"Thyroid nuclear factor 1 (TTF-1) contains a homeodomain and displays a novel DNA binding specificity.","date":"1990","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/1976511","citation_count":499,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"18391950","id":"PMC_18391950","title":"Identification of ten loci associated with height highlights new biological pathways in human growth.","date":"2008","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/18391950","citation_count":454,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15489334","id":"PMC_15489334","title":"The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).","date":"2004","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/15489334","citation_count":438,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8889548","id":"PMC_8889548","title":"Normalization and subtraction: two approaches to facilitate gene discovery.","date":"1996","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/8889548","citation_count":401,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21481790","id":"PMC_21481790","title":"Integrated transcript and genome analyses reveal NKX2-1 and MEF2C as potential oncogenes in T cell acute lymphoblastic leukemia.","date":"2011","source":"Cancer cell","url":"https://pubmed.ncbi.nlm.nih.gov/21481790","citation_count":323,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19198613","id":"PMC_19198613","title":"Common variants on 9q22.33 and 14q13.3 predispose to thyroid cancer in European populations.","date":"2009","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19198613","citation_count":317,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19740516","id":"PMC_19740516","title":"Napsin A and thyroid transcription factor-1 expression in carcinomas of the lung, breast, pancreas, colon, kidney, thyroid, and malignant mesothelioma.","date":"2009","source":"Human pathology","url":"https://pubmed.ncbi.nlm.nih.gov/19740516","citation_count":246,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21164283","id":"PMC_21164283","title":"Subclassification of non-small cell lung carcinomas lacking morphologic differentiation on biopsy specimens: Utility of an immunohistochemical panel containing TTF-1, napsin A, p63, and CK5/6.","date":"2011","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/21164283","citation_count":236,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8675988","id":"PMC_8675988","title":"Expression of thyroid transcription factor-1(TTF-1) in fetal and neonatal human lung.","date":"1996","source":"The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society","url":"https://pubmed.ncbi.nlm.nih.gov/8675988","citation_count":181,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"7713914","id":"PMC_7713914","title":"Gene structure and expression of human thyroid transcription factor-1 in respiratory epithelial cells.","date":"1995","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7713914","citation_count":166,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15494458","id":"PMC_15494458","title":"PAX8, TITF1, and FOXE1 gene expression patterns during human development: new insights into human thyroid development and thyroid dysgenesis-associated malformations.","date":"2004","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/15494458","citation_count":162,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11971878","id":"PMC_11971878","title":"Mutations in TITF-1 are associated with benign hereditary chorea.","date":"2002","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11971878","citation_count":160,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"14970209","id":"PMC_14970209","title":"TAZ interacts with TTF-1 and regulates expression of surfactant protein-C.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14970209","citation_count":151,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11854318","id":"PMC_11854318","title":"Partial deficiency of thyroid transcription factor 1 produces predominantly neurological defects in humans and mice.","date":"2002","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/11854318","citation_count":142,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12051643","id":"PMC_12051643","title":"Thyroid transcription factor-1: a review.","date":"2002","source":"Applied immunohistochemistry & molecular morphology : AIMM","url":"https://pubmed.ncbi.nlm.nih.gov/12051643","citation_count":140,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19730683","id":"PMC_19730683","title":"The variant rs1867277 in FOXE1 gene confers thyroid cancer susceptibility through the recruitment of USF1/USF2 transcription factors.","date":"2009","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19730683","citation_count":132,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"22237264","id":"PMC_22237264","title":"High incidence of EGFR mutations in Korean men smokers with no intratumoral heterogeneity of lung adenocarcinomas: correlation with histologic subtypes, EGFR/TTF-1 expressions, and clinical features.","date":"2012","source":"Journal of thoracic oncology : official publication of the International Association for the Study of Lung Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/22237264","citation_count":131,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"23763999","id":"PMC_23763999","title":"NKX2-1/TTF-1: an enigmatic oncogene that functions as a double-edged sword for cancer cell survival and progression.","date":"2013","source":"Cancer cell","url":"https://pubmed.ncbi.nlm.nih.gov/23763999","citation_count":128,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9582279","id":"PMC_9582279","title":"Cloning and functional characterization of PTRF, a novel protein which induces dissociation of paused ternary transcription complexes.","date":"1998","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/9582279","citation_count":128,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"30148742","id":"PMC_30148742","title":"A Comparison of GATA3, TTF1, CD10, and Calretinin in Identifying Mesonephric and Mesonephric-like Carcinomas of the Gynecologic Tract.","date":"2018","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/30148742","citation_count":124,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11957142","id":"PMC_11957142","title":"Expression of thyroid transcription factor-1 in the spectrum of neuroendocrine cell lung proliferations with special interest in carcinoids.","date":"2002","source":"Human pathology","url":"https://pubmed.ncbi.nlm.nih.gov/11957142","citation_count":117,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12441357","id":"PMC_12441357","title":"The paired domain-containing factor Pax8 and the homeodomain-containing factor TTF-1 directly interact and synergistically activate transcription.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12441357","citation_count":117,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19293183","id":"PMC_19293183","title":"Thyroid transcription factor-1 inhibits transforming growth factor-beta-mediated epithelial-to-mesenchymal transition in lung adenocarcinoma cells.","date":"2009","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/19293183","citation_count":117,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"16980598","id":"PMC_16980598","title":"Thyroid transcription factor 1--a new prognostic factor in lung cancer: a meta-analysis.","date":"2006","source":"Annals of oncology : official journal of the European Society for Medical Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/16980598","citation_count":113,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"7559607","id":"PMC_7559607","title":"Upstream enhancer activity in the human surfactant protein B gene is mediated by thyroid transcription factor 1.","date":"1995","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7559607","citation_count":113,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21716147","id":"PMC_21716147","title":"Significance of thymidylate synthase and thyroid transcription factor 1 expression in patients with nonsquamous non-small cell lung cancer treated with pemetrexed-based chemotherapy.","date":"2011","source":"Journal of thoracic oncology : official publication of the International Association for the Study of Lung Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/21716147","citation_count":110,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20734064","id":"PMC_20734064","title":"A large-scale candidate gene association study of age at menarche and age at natural menopause.","date":"2010","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20734064","citation_count":106,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49813,"output_tokens":8450,"usd":0.138095},"stage2":{"model":"claude-opus-4-6","input_tokens":12235,"output_tokens":3665,"usd":0.2292},"total_usd":0.84706,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":64628,"output_tokens":12903,"usd":0.193715},"round2_rules_fired":"R2","round2_stage2":{"model":"claude-opus-4-6","input_tokens":17230,"output_tokens":4182,"usd":0.28605}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"NKX2-1 is required for septation of the anterior foregut into trachea and esophagus, for distal lung branching morphogenesis, and for differentiation of pulmonary epithelial cells (surfactant protein gene expression); its loss also reduces Bmp-4 expression in lung epithelium, providing a mechanistic clue for impaired branching.\",\n      \"method\": \"Homozygous targeted gene disruption (knockout mouse) with histology, in situ hybridization, and gene expression analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple defined cellular and molecular phenotypes, replicated in follow-up studies\",\n      \"pmids\": [\"10208743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Distal lung morphogenesis (branching beyond mainstem bronchi) is strictly dependent on NKX2-1; its loss leads to absence of alpha-integrin and collagen IV expression and altered VEGF isoform expression pattern resembling tracheobronchial epithelium, while proximal lung morphogenesis is NKX2-1-independent.\",\n      \"method\": \"Nkx2.1 null mouse analysis with immunostaining for ECM proteins/integrins and in situ hybridization for VEGF isoforms\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with multiple orthogonal molecular readouts defining pathway position\",\n      \"pmids\": [\"10706142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The two NKX2-1 protein isoforms (371 aa and 401 aa) are functionally distinct: the longer isoform with a 30-aa N-terminal extension has reduced transactivation activity on the SP-C promoter compared to the shorter isoform, likely through steric interference.\",\n      \"method\": \"Site-directed mutagenesis of the 30-aa extension combined with transactivation reporter assays in lung epithelial cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro mutagenesis and reporter assay, single lab\",\n      \"pmids\": [\"10753648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"ERK directly phosphorylates TTF-1/NKX2-1 at three serine residues downstream of oncogenic Ras/Raf/MEK signaling, and mutation of these serines to alanines completely abolishes ERK-mediated phosphorylation and partially rescues TTF-1 transcriptional activity; an additional ERK-independent pathway (via V12N38 Ras) also represses TTF-1.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis (serine-to-alanine), transfection reporter assays, MEK inhibitors (U0126, PD98059)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro phosphorylation assay plus mutagenesis plus reporter assays, multiple orthogonal approaches\",\n      \"pmids\": [\"10733581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TTF-1/NKX2-1 binds to specific consensus sites in the WNT7b promoter and, together with GATA6 and Foxa2, trans-activates it in lung epithelial cells; TTF-1 and GATA6 physically interact in vivo and synergistically activate the minimal WNT7b promoter region.\",\n      \"method\": \"EMSA, co-transfection reporter assays, co-immunoprecipitation (physical interaction), promoter truncation analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted binding, co-IP, and functional reporter assays with multiple orthogonal methods\",\n      \"pmids\": [\"11914369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Heterozygous loss-of-function mutations in NKX2-1 cause the triad of congenital hypothyroidism, choreoathetosis, and pulmonary problems in humans (brain-lung-thyroid syndrome), demonstrating NKX2-1 haploinsufficiency affects thyroid, basal ganglia, and lung function.\",\n      \"method\": \"Human genetic analysis — identification of heterozygous point mutations (missense, nonsense) and a complete gene deletion in five patients with the syndrome\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human loss-of-function genetics with defined multi-organ phenotype, replicated across multiple patients and labs\",\n      \"pmids\": [\"11854319\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TTF-1 binds to and transactivates the angiotensinogen promoter at a binding motif at -125; antisense knockdown of TTF-1 in the subfornical organ reduces angiotensinogen mRNA and dramatically alters water intake and urine excretion, revealing a role for TTF-1 in body fluid homeostasis.\",\n      \"method\": \"Gel mobility shift assay (EMSA), transfection reporter assay with promoter deletion, in vivo antisense oligodeoxynucleotide knockdown, RNase protection assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — binding assays plus in vivo knockdown with functional readout, single lab\",\n      \"pmids\": [\"12730191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TTF-1 binds to six of seven putative binding sites in the PACAP gene 5'-flanking region and transactivates the PACAP promoter dose-dependently; deletion of the core TTF-1 binding motif at -369 abolishes this transactivation; intracerebroventricular antisense TTF-1 knockdown reduces hypothalamic PACAP mRNA in vivo.\",\n      \"method\": \"EMSA, transfection reporter assay with promoter deletion, in vivo antisense oligodeoxynucleotide knockdown, RNase protection assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — binding assays, reporter assays, and in vivo knockdown, single lab\",\n      \"pmids\": [\"12122016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In Nkx2.1-deficient mice, ascending dopaminergic axons from mesencephalic neurons aberrantly cross the ventral midline and project contralaterally instead of ipsilaterally, associated with loss of semaphorin 3A and slit2 expression in the hypothalamic neuroepithelium, implicating NKX2-1 in axon guidance through chemorepulsive signals.\",\n      \"method\": \"Immunohistochemistry, DiI axon tracing in mutant embryos, immunoreactivity for semaphorin 3A\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with axon tracing and molecular localization, single lab\",\n      \"pmids\": [\"12821380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Double-mutant analysis of Nkx2.1 and Gsh2 reveals these homeodomain factors act cooperatively (not by cross-repression) to pattern the ventral telencephalon; however, Gsh2 expression in the MGE after E10.5 may negatively regulate Nkx2.1-dependent oligodendrocyte specification.\",\n      \"method\": \"Double-mutant mouse analysis with loss- and gain-of-function approaches, gene expression analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in double-mutant mice with multiple readouts\",\n      \"pmids\": [\"12930780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Sonic hedgehog (Shh) is required to maintain Nkx2.1 expression in the MGE during embryonic neurogenesis; importantly, this maintenance function of Shh does not require blocking Gli3 repressor formation (unlike the initial induction of Nkx2.1), indicating a Gli3-independent mechanism.\",\n      \"method\": \"Genetic analysis of Shh and Gli3 mutant mice with Nkx2.1 expression readout\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with defined molecular readout, single lab\",\n      \"pmids\": [\"16766713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Neuronal TTF-1/NKX2-1 deletion in differentiated neurons (conditional KO) causes delayed puberty, reduced reproductive capacity, and short reproductive span associated with reduced hypothalamic expression of genes required for sexual development, without basal ganglia dysfunction, demonstrating a postdevelopmental role in neuroendocrine control of reproduction.\",\n      \"method\": \"Conditional neuron-specific Ttf1 knockout mouse, gene expression profiling, behavioral and hormonal analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined phenotype and gene expression changes, multiple readouts\",\n      \"pmids\": [\"17182767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nkx2.1 is expressed in the MGE and is required for the specification of PV- and SST-expressing cortical interneuron subtypes; conditional removal of Nkx2.1 at distinct neurogenic time points causes a switch in interneuron subtypes, establishing a causal link between embryonic Nkx2.1 expression in progenitors and the functional identity of mature interneurons.\",\n      \"method\": \"Conditional loss-of-function mouse genetics with temporal control; neurochemical subtype analysis of mature cortical interneurons\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with temporal resolution and defined cellular phenotype, replicated across studies\",\n      \"pmids\": [\"18786356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Postmitotic Nkx2-1 directly represses the guidance receptor Neuropilin-2, and downregulation of Nkx2-1 in postmitotic cells is necessary for cortical migration while its maintenance is required for striatal migration of MGE-derived interneurons; Nkx2-1 thus regulates interneuron migration by transcriptionally controlling guidance receptors in postmitotic cells.\",\n      \"method\": \"Mouse genetics (conditional/constitutive KO), chromatin immunoprecipitation (ChIP) for direct binding to Neuropilin-2 locus, in utero electroporation, migration assays\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP demonstrating direct binding plus genetic loss-of-function with defined migration phenotype\",\n      \"pmids\": [\"18786357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TAZ physically interacts with both TTF-1 and Pax8 in thyroid cells (co-immunoprecipitation in vitro and in vivo), and this interaction significantly enhances TTF-1 and Pax8 transcriptional activity on the thyroglobulin promoter, identifying TAZ as a coactivator of NKX2-1 in thyroid differentiation.\",\n      \"method\": \"Co-immunoprecipitation (in vitro and in vivo), co-transfection reporter assay, confocal immunofluorescence\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP plus functional reporter, single lab\",\n      \"pmids\": [\"19010321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Three missense NKX2-1 mutations (L176V, P202L, Q210P) cause loss of transactivation capacity on the thyroglobulin enhancer/promoter; deficient transcriptional activity of NKX2-1-P202L is completely rescued by co-transfected PAX8-WT, whereas L176V and Q210P abolish the PAX8 synergistic effect, revealing a cooperative PAX8-NKX2-1 functional interaction.\",\n      \"method\": \"In vitro transactivation reporter assays with mutant and wild-type constructs; co-transfection with PAX8\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional rescue assays with mutagenesis and defined mechanistic outcome\",\n      \"pmids\": [\"19336474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NKX2-1/Nkx2.1 binds directly to the RET promoter; SNPs in the NKX2-1 binding motif (rs10900296, rs10900297) reduce NKX2-1 binding and lower RET transcription; NKX2-1 cooperates with Phox2b and Sox10 (but not Pax3) synergistically to mediate RET transcription.\",\n      \"method\": \"Dual-luciferase reporter assay, EMSA/binding assay with SNP constructs, co-transfection with transcription factor combinations\",\n      \"journal\": \"Journal of pediatric surgery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assays with mutagenesis and combinatorial transcription factor analysis, single lab\",\n      \"pmids\": [\"19853745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NKX2-1 induces expression of the receptor tyrosine kinase ROR1, which in turn sustains pro-survival PI3K-AKT signaling through ROR1 kinase-dependent c-Src activation and kinase-independent stabilization of the EGFR-ERBB3 association and ERBB3 phosphorylation, providing a lineage-survival mechanism in lung adenocarcinoma.\",\n      \"method\": \"siRNA knockdown, gain-of-function overexpression, kinase-dead mutant analysis, co-immunoprecipitation of EGFR-ERBB3, phosphorylation assays\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including kinase mutants, co-IP, and functional signaling readouts\",\n      \"pmids\": [\"22439932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NKX2-1 controls tumor differentiation and limits metastatic potential in lung adenocarcinoma in part by repressing the chromatin regulator Hmga2; gain- and loss-of-function experiments demonstrate that NKX2-1 loss leads to de-repression of Hmga2 and increased metastatic seeding ability.\",\n      \"method\": \"Conditional gain- and loss-of-function in mouse lung adenocarcinoma cells, in vivo transplantation assays, cross-species gene expression analysis, functional complementation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vivo and in vitro methods across mouse and human, replicated\",\n      \"pmids\": [\"21471965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Continuous NKX2-1 expression in postmitotic cholinergic basal forebrain neurons is required for their maturation and maintenance; prenatal deletion in GAD67+ neurons leads to near-complete loss of cholinergic neurons and PV+ GABAergic neurons in the basal forebrain, with partial denervation of target structures and spatial memory impairment.\",\n      \"method\": \"Two conditional knockout mouse lines (prenatal GAD67-Cre and postnatal ChAT-Cre), immunohistochemistry, behavioral testing\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — two conditional KO systems with cellular and behavioral phenotypes\",\n      \"pmids\": [\"22098391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Haploinsufficiency of Nkx2-1 combined with oncogenic KrasG12D (but not EGFRL858R) causes pulmonary mucinous adenocarcinoma; ChIP-seq shows NKX2-1 directly associates with genes induced in mucinous tumors at both canonical NKX2-1 binding elements and AP-1 binding elements; NKX2-1 inhibits AP-1 activity and tumor colony formation in vitro.\",\n      \"method\": \"Transgenic mouse models (Kras/Nkx2-1 haploinsufficient), ChIP-seq, in vitro AP-1 reporter assay, colony formation assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-seq for direct binding plus in vivo genetic model and in vitro functional assays\",\n      \"pmids\": [\"23143308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"mTOR inhibition promotes TTF-1/NKX2-1-dependent redifferentiation of thyroid carcinoma cells, leading to up-regulation of sodium-iodine symporter (NIS) and increased radioactive iodine uptake; siRNA knockdown of TTF-1 completely abrogates NIS induction, demonstrating that the redifferentiation effect is mediated through TTF-1.\",\n      \"method\": \"mTOR inhibitor treatment, siRNA knockdown of TTF-1, iodine uptake assay, mRNA and protein expression analysis\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA epistasis with functional iodine uptake readout, single lab\",\n      \"pmids\": [\"24712572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NKX2-1, Foxa2, and Cdx2 act redundantly as co-suppressors of the metastatic program in lung adenocarcinoma; simultaneous knockdown of all three transcription factors is sufficient to promote metastatic potential of nonmetastatic cells in vivo, and activates expression of Tks5long, Hmga2, and Snail.\",\n      \"method\": \"Combinatorial siRNA knockdown in mouse and human lung adenocarcinoma cells, in vivo transplantation metastasis assay, gene expression profiling\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — combinatorial loss-of-function with defined in vivo metastatic phenotype and transcriptional targets\",\n      \"pmids\": [\"26341558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nkx2.1-derived cells (both GABAergic interneurons and astroglia) are required for anterior commissure formation; Nkx2.1-regulated cells mediate axon guidance through expression of the repellent cue Slit2.\",\n      \"method\": \"Selective cell ablation in mouse, fate mapping, immunohistochemistry for Slit2 expression\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell ablation with defined structural phenotype and molecular mechanism (Slit2), single lab\",\n      \"pmids\": [\"25904499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NKX2-1 binds at distal regulatory elements and establishes a repressed epigenetic state in the ventricular zone, while also being required to establish permissive chromatin and transcriptional activation in the sub-ventricular and mantle zones; combinatorial binding of NKX2-1 and LHX6 promotes transcriptionally permissive chromatin and activates genes in cortical migrating interneurons.\",\n      \"method\": \"ChIP-seq for NKX2-1 genome-wide binding, ATAC-seq for chromatin accessibility, RNA-seq in Nkx2-1 mutant MGE\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genome-wide binding, chromatin state, and transcriptomic analysis integrated with genetic loss-of-function\",\n      \"pmids\": [\"27657450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Selenbp1 is a direct transcriptional target of NKX2-1 in lung adenocarcinoma; loss- and gain-of-function show NKX2-1 is required and sufficient for Selenbp1 expression; Selenbp1 also stabilizes NKX2-1 protein levels, forming a positive feedback loop; Selenbp1 inhibits clonal growth, migration, and in vivo metastasis.\",\n      \"method\": \"ChIP demonstrating direct NKX2-1 binding to Selenbp1, siRNA knockdown, overexpression, CRISPR/Cas9 knockout, in vivo transplant and autochthonous mouse models\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct ChIP, multiple loss/gain-of-function, and in vivo validation\",\n      \"pmids\": [\"30002193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NKX2-1 loss in BRAFV600E-driven lung adenocarcinoma leads to IMA-like gastric-differentiation tumors that fail to exit the cell cycle after BRAF/MEK inhibitor treatment (unlike NKX2-1-positive tumors); BRAF/MEK inhibitors drive cell identity switching within the gastric lineage in NKX2-1-negative cells, mediated in part by WNT signaling and FoxA1/2, revealing a complex feedback between NKX2-1 and oncogenic signaling in controlling lineage identity.\",\n      \"method\": \"Genetically engineered mouse models, pharmacologic BRAF/MEK inhibition, gene expression analysis, cell cycle analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic models plus pharmacologic intervention with defined molecular and cellular phenotypes\",\n      \"pmids\": [\"33821796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NKX2-1 directly binds and represses the promoters of CXCL1, CXCL2, and CXCL5 genes (ATAC-seq), and NKX2-1 depletion triggers CXCL secretion that recruits tumor-promoting neutrophils via CXCR2 signaling, promoting lung adenocarcinoma progression.\",\n      \"method\": \"NKX2-1 knockdown, ATAC-seq revealing NKX2-1 restriction of CXCL promoters, chemokine array, CXCR2 antagonist in syngeneic mouse model, single-cell RNA-seq\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — chromatin accessibility assay plus functional in vivo model, single lab\",\n      \"pmids\": [\"39113226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of FoxA1/2 in NKX2-1-positive lung adenocarcinoma leads to aberrant NKX2-1 genomic localization and activity that actively inhibits tumorigenesis and drives alternative non-proliferative cellular identity programs, demonstrating FoxA1/2 are required to direct NKX2-1 to appropriate genomic targets.\",\n      \"method\": \"Foxa1/2 conditional knockout in KRAS-driven mouse models and human cell lines, ChIP-seq for NKX2-1 genomic localization, gene expression profiling\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-seq for NKX2-1 localization combined with in vivo genetic models and defined cellular phenotype\",\n      \"pmids\": [\"35835117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NKX2-1 directly binds and transcriptionally upregulates serine/glycine synthesis enzyme genes (ChIP-qPCR), enabling NKX2-1-expressing cancer cells to proliferate and invade in serine/glycine-depleted conditions; this generates nucleotides and redox molecules and is associated with altered cellular lipidome and methylome.\",\n      \"method\": \"ChIP-qPCR, NKX2-1 overexpression/knockdown/knockout models, mass spectrometry metabolomics, proliferation and invasion assays, mouse tumor models\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct ChIP with functional metabolic and cellular validation in multiple models\",\n      \"pmids\": [\"36932191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The TTF-1 homeodomain (TTF-1 HD) adopts a three-helix structure with a helix-turn-helix motif as determined by NMR; this three-dimensional arrangement is consistent with DNA-binding function.\",\n      \"method\": \"500 MHz 1H NMR spectroscopy with full assignment and secondary structure determination of the 68-residue TTF-1 HD peptide\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure, but without functional mutation validation in same paper\",\n      \"pmids\": [\"8282100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The TTF-1 homeodomain is thermodynamically unstable in isolation (Tm 42°C, low Gibbs free energy of ~1.4 kcal/mol) and forms loose helices with high flexibility; a small reduction in alpha-helical content significantly modifies DNA-binding activity, indicating conformational flexibility is functionally relevant.\",\n      \"method\": \"Circular dichroism (CD) thermal denaturation and isothermal urea unfolding; CD-monitored assessment of DNA-binding activity\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — biophysical characterization with functional DNA-binding readout, single study\",\n      \"pmids\": [\"7957942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The TTF-1 homeodomain preferentially recognizes a spectrum of sequences with the 5'-CAAG-3' core motif but can also bind related sequences without this motif with only 2-fold reduced affinity, indicating a wider DNA-binding specificity than previously determined.\",\n      \"method\": \"TTF-1HD-Sepharose affinity chromatography selection with sequential enrichment of binding sequences; DNA-binding activity measurement\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical selection assay defining binding specificity\",\n      \"pmids\": [\"7654238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"TTF-1 binds to three sites (A, B, C) in the bovine thyroglobulin promoter as shown by DNase I footprinting; mutations reducing TTF-1 binding at sites A, C, and B all reduce promoter activity in primary thyrocytes, demonstrating TTF-1 binding is functionally required for thyroglobulin promoter activity.\",\n      \"method\": \"DNase I footprinting with purified TTF-1, site-directed mutagenesis, transient transfection in primary-cultured dog thyrocytes\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro footprinting plus mutagenesis in primary cells\",\n      \"pmids\": [\"1555648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HOXB5 binds to the RET promoter 5' upstream of the NKX2-1 binding site, forms a protein complex with NKX2-1, and the two synergistically trans-activate RET expression; HSCR-associated SNPs at the NKX2-1 binding site abolish this synergistic activation.\",\n      \"method\": \"Dual-luciferase reporter assay, co-immunoprecipitation (protein complex), ChIP, promoter mutation analysis with HSCR-associated SNPs\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus functional reporter with disease-relevant mutations, single lab\",\n      \"pmids\": [\"21677782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CRISPRi targeting of specific NKX2-1-binding sites reveals that only a subset of NKX2-1 genomic binding sites are functionally indispensable for target gene expression (including SFTPB, LAMP3, SFTPA1/2, MYBPH, LMO3, CD274/PD-L1), while others are dispensable, demonstrating unequal functional roles of individual NKX2-1 binding sites.\",\n      \"method\": \"CRISPRi (CRISPR/dCas9-KRAB) targeting of 19 NKX2-1 ChIP-seq binding sites combined with gene expression measurement\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — systematic CRISPRi screen of binding sites with defined gene expression readouts\",\n      \"pmids\": [\"33980985\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NKX2-1 is a homeodomain transcription factor that directly binds target gene promoters and enhancers (via a 5'-CAAG-3' core motif) in a context-dependent manner to activate or repress gene expression; it is phosphorylated and inhibited by ERK downstream of Ras/Raf/MEK signaling; it physically cooperates with PAX8, GATA6, FOXA2, LHX6, TAZ, HOXB5, and other partners to regulate organ-specific gene programs in lung, thyroid, and brain; it is required for anterior foregut septation, distal lung branching morphogenesis, pulmonary surfactant gene expression, thyroid differentiation, and multiple aspects of forebrain/MGE development including cortical interneuron specification and migration (via direct repression of Neuropilin-2 and other guidance receptors); in lung adenocarcinoma it functions as a lineage-survival oncogene (when amplified) and a metastasis suppressor (via repression of Hmga2, CXCL chemokines, and other targets), with its genomic targeting and activity dependent on pioneer factors FoxA1/2; haploinsufficiency in humans causes brain-lung-thyroid syndrome.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1990,\n      \"finding\": \"TTF-1 (NKX2-1) was identified as a thyroid nuclear factor containing a homeodomain with sequence homology to the Drosophila NK-2 homeodomain; the protein binds to promoters of thyroid-specific genes and its mRNA/binding activity is detected in thyroid and lung, with chromosomal localization to human chromosome 14 and mouse chromosome 12.\",\n      \"method\": \"cDNA cloning, DNA-binding assays with nuclear extracts, chromosomal mapping\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original cloning and biochemical characterization with DNA-binding validation, foundational paper with >499 citations\",\n      \"pmids\": [\"1976511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"TTF-1 binds to three specific sites (A, B, C) in the bovine thyroglobulin gene promoter as revealed by DNase I footprinting; mutations reducing TTF-1 binding at A, B, and C sites also decreased promoter activity in transfection assays in primary thyrocytes, demonstrating that TTF-1 binding is functionally required for thyroglobulin gene transcription.\",\n      \"method\": \"DNase I footprinting, site-directed mutagenesis, transient transfection assays in primary dog thyrocytes\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro footprinting combined with mutagenesis and functional promoter assays\",\n      \"pmids\": [\"1555648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The NMR structure of the rat TTF-1 homeodomain (TTF-1 HD) was determined, revealing three helices arranged in a helix-turn-helix motif similar to other homeodomains, consistent with its DNA-binding function.\",\n      \"method\": \"500 MHz 1H NMR spectroscopy, standard 2D NMR methodology, secondary structure determination\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structural determination with full spectral assignment\",\n      \"pmids\": [\"8282100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The conformational stability of the TTF-1 homeodomain was characterized; it has a Tm of 42°C and low Gibbs free energy of stabilization (~1.3–1.4 kcal/mol), indicating it is a mobile, flexible segment folded into loose helices, and small reductions in alpha-helical content significantly modify DNA-binding activity.\",\n      \"method\": \"Circular dichroism-monitored thermal denaturation and urea unfolding, DNA-binding activity assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — biophysical characterization, single lab, single study\",\n      \"pmids\": [\"7957942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The DNA-binding specificity of the TTF-1 homeodomain preferentially recognizes sequences with the 5'-CAAG-3' core motif, but also binds a wider spectrum of sequences; the 5'-CAAG-3' core is necessary but not sufficient for maximal binding affinity.\",\n      \"method\": \"TTF-1 HD-Sepharose column chromatography, sequential selection and amplification of binding sequences (SELEX-like), binding activity measurement\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical selection with binding quantification, single lab\",\n      \"pmids\": [\"7654238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"TTF-1 activates transcription of the human surfactant protein B (SP-B) gene through an upstream enhancer element (−439 to −331 bp); three TTF-1 binding sites in this region were identified, purified TTF-1 homeodomain binds this region, co-transfection of TTF-1 transactivates the SP-B promoter, and mutation of TTF-1 binding sites blocks both binding and transactivation.\",\n      \"method\": \"Deletion analysis, luciferase reporter assays, co-transfection, purified TTF-1 binding assays, site-directed mutagenesis of binding sites\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted binding with purified protein, mutagenesis, functional reporter assays\",\n      \"pmids\": [\"7559607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The human NKX2-1/TTF-1 gene was characterized as a single locus spanning ~3.3 kb with two exons and a single intron, encoding a 371 amino acid protein highly conserved with rat TTF-1 (98% identity); the 5'-flanking region directs lung epithelial cell-selective transcription; TTF-1 protein is localized to nuclei of fetal lung epithelial cells from 11 weeks gestation and postnatally in type II epithelial cells and bronchiolar epithelial subsets.\",\n      \"method\": \"Gene cloning and sequencing, immunohistochemistry, luciferase reporter transfection assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — gene structure determination combined with promoter activity assays and immunolocalization, foundational characterization paper\",\n      \"pmids\": [\"7713914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The human Nkx2.1 gene is organized into three exons and two introns (revising previous reports of two exons); a newly identified exon I contains an ATG codon in-frame with a previously identified initiator codon on the 5E transcript, and in vitro transcription/translation of this 5E cDNA produces a 44 kDa polypeptide; at least two independent regions (within intron 1 and 5' of exon 1) may mediate basal promoter activity in lung epithelial cells.\",\n      \"method\": \"cDNA cloning, genomic cloning, sequencing, Northern blot analysis, in vitro transcription/translation, promoter activity assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gene structure revision with functional promoter mapping, single lab\",\n      \"pmids\": [\"9545595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Nkx2.1 is required for septation of the anterior foregut into trachea and esophagus; homozygous Nkx2.1-null mouse embryos fail to form separate tracheal and esophageal structures, develop profoundly hypoplastic lungs that fail normal branching morphogenesis, and lack pulmonary surfactant protein gene expression; reduced Bmp-4 expression in mutant lung epithelium was identified as a possible mechanistic clue for impaired branching.\",\n      \"method\": \"Targeted gene disruption (knockout mice), in situ hybridization for Bmp-4 and Vegf, histological analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function mouse model with defined morphogenetic and molecular phenotypes, replicated finding, >357 citations\",\n      \"pmids\": [\"10208743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The two NKX2.1 protein isoforms (371 aa and 401 aa) are functionally distinct: the longer isoform (401 aa, encoded by a transcript including all three exons) exhibits reduced transcriptional activity on an SP-C target promoter compared to the truncated major isoform; the 30 amino acid N-terminal extension likely acts by steric interference, as demonstrated by site-directed mutagenesis.\",\n      \"method\": \"Differential expression analysis of transcripts, transactivation reporter assays, site-directed mutagenesis of the 30 aa extension\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional assays with mutagenesis, single lab\",\n      \"pmids\": [\"10753648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Distal lung morphogenesis (but not proximal) is strictly dependent on Nkx2.1; Nkx2.1-null lungs show significantly reduced or absent expression of alpha-integrins and collagen type IV (unlike laminin which is maintained), and exhibit predominant Vegf1/reduced Vegf3 expression typical of tracheobronchial epithelium, indicating Nkx2.1 controls the epithelial phenotype required for distal morphogenesis.\",\n      \"method\": \"Analysis of Nkx2.1(-/-) embryos, immunohistochemistry/in situ hybridization for ECM proteins, integrins, and Vegf isoforms\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function mouse model with molecular pathway analysis, single lab\",\n      \"pmids\": [\"10706142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Oncogenic Ras represses TTF-1 transcriptional activity through multiple downstream pathways; the Raf/MEK/ERK cascade directly phosphorylates TTF-1 at three serine residues, and mutation of these serines to alanines abolishes ERK-mediated phosphorylation in vitro and in vivo; a second ERK-independent pathway (activated by V12N38 Ras) also partially represses TTF-1 activity, and combined activation of both pathways nearly completely abolishes TTF-1 function.\",\n      \"method\": \"Transient transfection assays with Ras effector mutants, activated Raf expression, MEK inhibitors (U0126, PD98059), in vitro kinase assay (ERK phosphorylates TTF-1), in vivo phosphorylation analysis, site-directed mutagenesis of serine residues\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro kinase assay combined with mutagenesis and in vivo phosphorylation confirmation\",\n      \"pmids\": [\"10733581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TTF-1 directly interacts with and synergistically activates transcription with Pax8; GST-Pax8 pull-down captures TTF-1 from thyroid and non-thyroid cell extracts, direct interaction is confirmed using bacterially purified TTF-1, and co-immunoprecipitation demonstrates in vivo interaction in thyroid cells; co-expression in HeLa cells synergistically activates thyroglobulin gene transcription requiring the N-terminal activation domain of TTF-1 and C-terminal domain of Pax8.\",\n      \"method\": \"GST pull-down with purified proteins, co-immunoprecipitation, transactivation reporter assays, deletion analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct interaction confirmed with purified proteins and co-IP in vivo, functional synergy demonstrated\",\n      \"pmids\": [\"12441357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NKX2-1 haploinsufficiency in humans (heterozygous loss-of-function mutations including deletions, missense, and nonsense mutations) causes a triad of congenital hypothyroidism, choreoathetosis/muscular hypotonia, and pulmonary problems, establishing NKX2-1 as required for thyroid, basal ganglia, and lung development and function in humans.\",\n      \"method\": \"Clinical phenotyping, gene sequencing, identification of heterozygous loss-of-function mutations in five patients\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple independent mutations with consistent clinical phenotype, corroborated by mouse model, >246 citations\",\n      \"pmids\": [\"11854319\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Heterozygous deletion of the mouse Ttf1 gene (haploinsufficiency) results in predominantly neurological phenotype (poor coordination) and elevated serum thyrotropin, demonstrating that TTF1 haploinsufficiency is sufficient to produce neurological and thyroid axis defects; a mutant human TTF1 (insertion into codon 86) fails to bind its cis-element or transactivate a thyroglobulin promoter reporter, and does not interfere with wild-type TTF1, confirming haploinsufficiency as the mechanism.\",\n      \"method\": \"Heterozygous Ttf1 knockout mouse analysis, reporter gene transactivation assay with mutant vs. wild-type TTF1, competition assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mechanistic validation in both human mutation analysis and mouse genetic model\",\n      \"pmids\": [\"11854318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TTF-1, GATA6, and Foxa2 directly bind to specific consensus sites within the WNT7b promoter (demonstrated by EMSA) and cooperatively transactivate WNT7b expression in lung epithelial cells; TTF-1 and GATA6 physically interact in vivo and synergistically activate the minimal TTF-1-containing WNT7b promoter region.\",\n      \"method\": \"Electrophoretic mobility shift assay (EMSA), transfection/transactivation assays, truncation mutagenesis of GATA6/Foxa2 binding sites, co-immunoprecipitation (TTF-1 and GATA6 in vivo interaction)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — EMSA binding, functional reporter assays with mutations, and in vivo co-IP all in same study\",\n      \"pmids\": [\"11914369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Mutations in TITF-1 (NKX2-1) are associated with benign hereditary chorea (BHC); a de novo 1.2 Mb deletion harboring TITF-1 was identified in a BHC family, and further TITF-1 mutations in additional BHC families were described, establishing NKX2-1 loss-of-function as the genetic cause of this dominantly inherited movement disorder.\",\n      \"method\": \"Linkage analysis, genomic deletion mapping, mutation screening by sequencing\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic evidence in multiple families with confirmed mutations, >160 citations\",\n      \"pmids\": [\"11971878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In Nkx2.1-null mice, ascending dopaminergic axons from mesencephalic DA cells aberrantly cross the ventral midline and project to the contralateral striatum instead of remaining ipsilateral; this is associated with loss of neuroepithelium in the ventromedial hypothalamus of the third ventricle and markedly reduced expression of semaphorin 3A (and previously reported slit2), indicating that NKX2-1 maintains chemorepulsive axon guidance cues in the hypothalamus.\",\n      \"method\": \"Tyrosine hydroxylase immunostaining in Nkx2.1(-/-) embryos, DiI axon tracing, immunohistochemistry for semaphorin 3A\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with axon tracing and molecular marker analysis, single lab\",\n      \"pmids\": [\"12821380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Nkx2.1 and Gsh2 act cooperatively (not through cross-repression) in patterning the ventral telencephalon; however, Gsh2 expression in the MGE after E10.5 may negatively regulate Nkx2.1-dependent oligodendrocyte specification, revealing both integrative and antagonistic interactions in telencephalic patterning.\",\n      \"method\": \"Double-mutant mouse analysis, loss- and gain-of-function genetic experiments, histological/marker analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in double mutants, single lab\",\n      \"pmids\": [\"12930780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TTF-1 directly regulates PACAP gene transcription in the hypothalamus: the TTF-1 homeodomain binds six of seven putative binding sites in the PACAP 5'-flanking region; TTF-1 dose-dependently activates the PACAP promoter in C6 glioma cells; deletion of the TTF-1 binding motif at −369 abolishes transactivation; intracerebroventricular antisense TTF-1 oligodeoxynucleotide reduces hypothalamic PACAP mRNA in vivo; TTF-1 and PACAP show coordinated daily oscillations in the rat hypothalamus.\",\n      \"method\": \"DNA-binding assays, transactivation reporter assays, deletion mutagenesis, in vivo antisense knockdown, RNase protection assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro binding, functional promoter assay with mutagenesis, and in vivo validation by antisense knockdown\",\n      \"pmids\": [\"12122016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TTF-1 regulates angiotensinogen gene transcription in the rat subfornical organ: TTF-1 mRNA co-localizes with angiotensinogen-producing cells; both mRNAs increase simultaneously upon water deprivation; TTF-1 dose-dependently transactivates the angiotensinogen promoter in C6 glioma cells; deletion of the TTF-1 binding motif at −125 abolishes transactivation; in vivo intracranial antisense TTF-1 oligodeoxynucleotide reduces angiotensinogen mRNA and causes decreased water intake and plasma vasopressin.\",\n      \"method\": \"Double in situ hybridization, RNase protection assays, reporter gene transactivation with deletion analysis, in vivo antisense knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro binding with functional mutagenesis, in vivo antisense validation\",\n      \"pmids\": [\"12730191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TAZ (transcriptional co-activator with PDZ-binding motif) directly interacts with TTF-1 and synergistically activates SP-C expression; pull-down experiments demonstrated direct TAZ–TTF-1 interaction; mammalian two-hybrid assays and pull-down experiments mapped TAZ binding to the NH2-terminal domain of TTF-1; co-expression of TAZ and TTF-1 synergistically activated mouse SP-C-luciferase reporter constructs.\",\n      \"method\": \"Mammalian two-hybrid assay, pull-down experiments, co-transfection luciferase reporter assays, immunolocalization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct interaction mapped by pull-down with domain deletion, functional synergy demonstrated, replicated in thyroid (2008 paper)\",\n      \"pmids\": [\"14970209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In vivo promoter analysis of the baboon Nkx2.1 5'-flanking region revealed that proximal and distal promoter fragments direct LacZ expression to brain (including hypothalamus) and two of three fragments direct tracheal epithelial-specific expression in transgenic mice, but parenchymal lung and thyroid expression was not conferred, demonstrating that cis-elements for tracheal vs. lung morphogenesis are distinct and thyroid-directing elements are absent from the tested ~4 kb region.\",\n      \"method\": \"BAC/transgene constructs with LacZ reporter, transgenic mouse analysis at E15 and E18\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo promoter analysis in transgenic mice, single lab\",\n      \"pmids\": [\"15094193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Sonic hedgehog (Shh) maintains Nkx2.1 expression in the MGE during neurogenesis to specify interneurons, but unlike its initial induction of Nkx2.1 (which requires antagonizing Gli3 repressor formation), the Nkx2.1 maintenance function of Shh does not require blocking Gli3R formation, revealing two mechanistically distinct Shh-dependent steps in Nkx2.1 regulation.\",\n      \"method\": \"Genetic mouse models (Shh conditional mutants, Gli3 mutants), immunohistochemistry, in situ hybridization\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in mouse models, single lab\",\n      \"pmids\": [\"16766713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Conditional deletion of Ttf1 from differentiated neurons causes delayed puberty, reduced reproductive capacity, and a short reproductive span associated with reduced hypothalamic expression of genes required for sexual development, without affecting basal ganglia morphology or function; TTF1 expression in the nonhuman primate hypothalamus increases at puberty, indicating a postdevelopmental role in neuroendocrine control of reproduction.\",\n      \"method\": \"Conditional Ttf1 neuronal knockout mice, gene expression profiling, reproductive phenotyping, extrapyramidal function testing\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional knockout with defined reproductive phenotype, single lab\",\n      \"pmids\": [\"17182767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nkx2.1 is required for the temporal specification of cortical interneuron subtypes: conditional removal of Nkx2.1 at distinct neurogenic time points causes a switch in interneuron subtypes produced, demonstrating a causal link between Nkx2.1 expression in progenitors and the functional identity of their neuronal progeny.\",\n      \"method\": \"Conditional loss-of-function mouse genetics (Cre-mediated deletion at different developmental timepoints), interneuron subtype marker analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with temporal resolution, specific phenotypic readout, >260 citations\",\n      \"pmids\": [\"18786356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Postmitotic Nkx2-1 controls interneuron migration by directly repressing the guidance receptor Neuropilin-2: downregulation of Nkx2-1 in postmitotic cells is required for cortical migration while maintenance is required for striatal migration; Nkx2-1 directly regulates Neuropilin-2 expression, which enables interneurons to invade the striatum.\",\n      \"method\": \"Conditional loss-of-function mouse genetics, in utero electroporation, interneuron migration assays, ChIP/reporter assays for Neuropilin-2 direct regulation\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct transcriptional target identification combined with genetic migration assays, >192 citations\",\n      \"pmids\": [\"18786357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TAZ acts as a coactivator for both Pax8 and TTF-1 in thyroid cells: TAZ is present in the nucleus of differentiated thyroid cells; TAZ physically interacts with both Pax8 and TTF-1 in vitro and in vivo; this interaction significantly enhances transcriptional activity on the thyroglobulin promoter, suggesting TAZ modulates thyroid-specific gene expression.\",\n      \"method\": \"Co-immunoprecipitation (in vitro and in vivo), cotransfection reporter assays, immunofluorescence co-localization\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP and functional synergy, single lab, extends prior TAZ-TTF-1 findings to thyroid context\",\n      \"pmids\": [\"19010321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Five new NKX2-1 mutations causing brain-lung-thyroid syndrome were characterized; functional analysis revealed that three missense mutations (L176V, P202L, Q210P) cause loss of transactivation capacity on the thyroglobulin enhancer/promoter; notably, deficient transcriptional activity of NKX2-1-P202L was completely rescued by co-transfected wild-type PAX8, whereas synergism was abolished by L176V and Q210P mutations, identifying a PAX8-NKX2-1 functional interaction critical for thyroid gene regulation.\",\n      \"method\": \"Mutation identification by sequencing, in vitro transactivation assays, co-transfection rescue experiments with PAX8\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional assays with multiple mutations and co-transfection rescue, mechanistically informative\",\n      \"pmids\": [\"19336474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NKX2-1 directly regulates RET transcription in coordination with Phox2b and Sox10: dual-luciferase reporter studies showed Nkx2-1 works cooperatively with Phox2b and Sox10 (but not Pax3) to activate the RET promoter; HSCR-associated SNPs at the NKX2-1 binding site reduce NKX2-1 binding and abolish synergistic transactivation of RET by HOXB5 and NKX2-1.\",\n      \"method\": \"Dual-luciferase reporter assays, immunohistochemistry for PHOX2B in human gut, SNP functional analysis\",\n      \"journal\": \"Journal of pediatric surgery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — reporter assays with multiple factors, single lab\",\n      \"pmids\": [\"19853745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TGF-beta inhibits lung endodermal morphogenesis partly through reduction of NKX2.1 protein and its downstream target surfactant protein C; this requires TGFbeta receptor II and is partially dependent on Smad3/Smad4 signaling; increased Pten expression accounts for TGFbeta's anti-proliferative effects but is not sufficient to restore morphogenesis, indicating NKX2.1 is an independent mediator of morphogenetic TGFbeta signaling.\",\n      \"method\": \"Mesenchyme-free embryonic lung endoderm explant model, conditional knockout mice (Smad3(-/-), Smad4Δ/Δ, TGFbetaRII conditional KO, Pten conditional KO), BrdU proliferation assays, protein/mRNA analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models with defined molecular readouts, single lab\",\n      \"pmids\": [\"18602626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TTF-1 inhibits TGF-beta-mediated epithelial-to-mesenchymal transition (EMT) in lung adenocarcinoma cells: TTF-1 expression down-regulates TGF-beta target genes including EMT regulators Snail and Slug; silencing TTF-1 enhances TGF-beta-mediated EMT; TTF-1 down-regulates TGF-beta2 production and TGF-beta conversely decreases TTF-1 expression, creating a reciprocal regulatory loop.\",\n      \"method\": \"TTF-1 overexpression and siRNA knockdown in lung adenocarcinoma cells, EMT marker analysis, invasion assays, gene expression analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal regulation demonstrated with gain- and loss-of-function, defined molecular phenotype, replicated findings\",\n      \"pmids\": [\"19293183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NKX2-1 controls tumor differentiation and limits metastatic potential in lung adenocarcinoma in part by repressing the embryonically restricted chromatin regulator Hmga2; gain- and loss-of-function experiments showed Nkx2-1 negativity is pathognomonic of high-grade poorly differentiated tumors, and Nkx2-1 constrains malignant progression through Hmga2 repression.\",\n      \"method\": \"Lentiviral mouse lung adenocarcinoma model, gain- and loss-of-function experiments in tumor cell lines, in vivo transplant experiments, gene expression analysis, functional complementation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vivo and in vitro approaches with functional complementation, >387 citations\",\n      \"pmids\": [\"21471965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NKX2-1 is amplified as a lineage-specific oncogene in lung cancer; siRNA-mediated knockdown of NKX2-1/TITF1 in lung cancer cell lines with amplification reduces cell proliferation through decreased cell-cycle progression and increased apoptosis.\",\n      \"method\": \"Genomic profiling of 128 lung cancer cell lines/tumors, siRNA knockdown, cell proliferation and apoptosis assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA knockdown with defined cellular phenotype, single lab\",\n      \"pmids\": [\"18212743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Continuous expression of Nkx2-1 is essential for the maturation and maintenance of cholinergic basal forebrain neurons: prenatal deletion of Nkx2-1 in GAD67-expressing neurons causes nearly complete loss of cholinergic and parvalbumin-positive GABAergic neurons in the basal forebrain; postnatal deletion in choline acetyltransferase-expressing cells also causes a striking reduction in cholinergic neuron number, with partial denervation of target structures and discrete spatial memory impairment.\",\n      \"method\": \"Two conditional knockout mouse lines (prenatal GAD67-Cre, postnatal ChAT-Cre), cell counting, denervation analysis, spatial memory behavioral testing\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — two complementary conditional KO strategies with defined cellular and behavioral phenotypes, single lab\",\n      \"pmids\": [\"22098391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HOXB5 physically interacts with NKX2-1 as a protein complex and synergistically mediates RET expression; HOXB5 binds the RET promoter region 5' upstream of the NKX2-1 binding site; HSCR-associated SNPs at the NKX2-1 binding site abolish this synergistic transactivation; in contrast, HOXB5 cooperates only additively with SOX10, PAX3, and PHOX2B.\",\n      \"method\": \"ChIP, luciferase reporter assays, co-immunoprecipitation of HOXB5-NKX2-1 complex, SNP functional analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and co-IP combined with functional assays, single lab\",\n      \"pmids\": [\"21677782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NKX2-1 induces expression of the receptor tyrosine kinase ROR1, which sustains a prosurvival PI3K-AKT/p38 signaling balance in lung adenocarcinoma through ROR1 kinase-dependent c-Src activation and kinase-independent maintenance of EGFR-ERBB3 association, ERBB3 phosphorylation, and PI3K activation; ROR1 knockdown inhibits lung adenocarcinoma cell lines including those with EGFR inhibitor resistance.\",\n      \"method\": \"NKX2-1 gain-of-function, ROR1 siRNA knockdown, signaling pathway analysis (PI3K-AKT, p38, Src, ERBB3), cell line proliferation/apoptosis assays\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — defined downstream pathway with mechanistic dissection of kinase-dependent and independent functions, multiple cell lines\",\n      \"pmids\": [\"22439932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Nkx2-1 haploinsufficiency combined with oncogenic Kras(G12D) causes mucinous pulmonary adenocarcinoma in transgenic mice; NKX2-1 directly associates with AP-1 binding elements and canonical NKX2-1 binding elements at genes induced in mucinous tumors (identified by ChIP-seq); NKX2-1 inhibits AP-1 activity and tumor colony formation in vitro, demonstrating context-dependent tumor suppressor activity against Kras-driven mucinous tumors.\",\n      \"method\": \"Transgenic mouse models (Nkx2-1 haploinsufficiency + Kras(G12D)), ChIP with massively parallel DNA sequencing (ChIP-seq), AP-1 reporter assays, colony formation assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP-seq genome-wide binding combined with functional in vitro and in vivo assays\",\n      \"pmids\": [\"23143308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MiR-365 directly regulates NKX2-1 protein levels in lung cancer; ectopic miR-365 expression decreased NKX2-1 expression in lung cancer cell lines, reduced cell proliferation, and NKX2-1 overexpression overcame the suppressive effect of miR-365, placing miR-365 as an upstream post-transcriptional regulator of NKX2-1.\",\n      \"method\": \"miR-365 mimic/inhibitor transfection, NKX2-1 overexpression, cell proliferation assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, single method without direct 3'UTR binding validation\",\n      \"pmids\": [\"23507558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"mTOR inhibition promotes TTF-1-dependent redifferentiation of thyroid carcinoma cells and increases iodine uptake; this redifferentiation is not mediated by autophagy or inflammation but through transcriptional upregulation of TTF-1; siRNA inhibition of TTF-1 completely abrogates mTOR inhibition-induced sodium-iodine symporter expression, placing TTF-1 as the key downstream mediator of mTOR-dependent thyroid differentiation.\",\n      \"method\": \"mTOR inhibitor treatment of thyroid carcinoma cell lines, siRNA knockdown of TTF-1, iodine uptake assays, mRNA/protein expression analysis\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA rescue experiment identifying TTF-1 as essential downstream mediator, single lab\",\n      \"pmids\": [\"24712572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nkx2-1-derived glia (astrocytes and polydendrocytes) are required for proper formation of the anterior commissure; selective cell ablation showed synergistic roles of Nkx2-1-derived GABAergic interneurons and astroglia in AC formation; Nkx2-1-regulated cells mediate anterior commissure axon guidance through expression of the repellent cue Slit2.\",\n      \"method\": \"Fate mapping, selective cell ablation strategy, Slit2 expression analysis, Nkx2.1 lineage tracing\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell ablation with defined axon guidance phenotype linked to Slit2, single lab\",\n      \"pmids\": [\"25904499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss of Foxa2 and Cdx2 synergizes with loss of Nkx2-1 to fully activate the metastatic program in lung adenocarcinoma; knockdown of all three factors synergistically promotes metastatic potential; this is sufficient to upregulate invadopodia component Tks5long, Hmga2, and Snail, accounting for a significant fraction of gene expression differences between non-metastatic and metastatic states.\",\n      \"method\": \"Knockdown of Foxa2, Cdx2, and Nkx2-1 alone and in combination; in vivo metastasis assays; gene expression analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic combinatorial knockdown with in vivo metastasis assays and transcriptomic validation, multiple orthogonal approaches\",\n      \"pmids\": [\"26341558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NKX2-1 controls regional identity and, together with LHX6, is necessary to specify pallidal projection neurons and forebrain interneurons; genome-wide chromosomal binding analysis showed NKX2-1 binding at distal regulatory elements leads to repressed epigenetic state and transcriptional repression in the ventricular zone, while NKX2-1 is also required to establish permissive chromatin and transcriptional activation in the sub-ventricular and mantle zones; combinatorial binding of NKX2-1 and LHX6 promotes permissive chromatin and activates genes in cortical migrating interneurons.\",\n      \"method\": \"ChIP-seq for NKX2-1 binding, ATAC-seq for chromatin state, RNA-seq for gene expression, conditional knockout analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — integrated multi-omics with genetic validation, context-dependent dual activator/repressor function established\",\n      \"pmids\": [\"27657450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Selenbp1 is a direct transcriptional target of Nkx2-1 in lung adenocarcinoma: Nkx2-1 is required and sufficient for Selenbp1 expression; Selenbp1 and Nkx2-1 function in a positive feedback loop (Selenbp1 stabilizes Nkx2-1 protein); Selenbp1 inhibits clonal growth and migration in vitro, suppresses metastasis in an in vivo transplant model, and its CRISPR/Cas9 inactivation enhances primary tumor growth in autochthonous models.\",\n      \"method\": \"Loss- and gain-of-function experiments, CRISPR/Cas9 Selenbp1 knockout, in vivo transplant and autochthonous mouse models, ChIP-seq for direct NKX2-1 binding\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct target identification by ChIP-seq, functional validation by CRISPR KO and transplant models, positive feedback loop established\",\n      \"pmids\": [\"30002193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NKX2-1 loss in BRAFV600E-driven lung adenocarcinoma leads to invasive mucinous adenocarcinoma with gastric differentiation; BRAF/MEK inhibitors drive NKX2-1-positive tumor cells into quiescence but fail to induce cell cycle exit in NKX2-1-negative cells; BRAF/MEK inhibitors induce cell identity switching within the gastric lineage in NKX2-1-negative tumors driven partly by WNT signaling and FoxA1/2, revealing a reciprocal NKX2-1/ERK/WNT feedback loop modulating gastric identity.\",\n      \"method\": \"Genetically engineered mouse models (BRAFV600E with/without NKX2-1), BRAF/MEK inhibitor treatment, cell cycle analysis, WNT pathway manipulation, FoxA1/2 expression analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo GEMM with pharmacological intervention and pathway dissection, multiple orthogonal approaches\",\n      \"pmids\": [\"33821796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NKX2-1 positively expresses in deep-layer neocortical neurogliaform cells (ID2+Nkx2.1+ cells) that are active during the down state of non-REM sleep; optogenetic activation of ID2+Nkx2.1+ interneurons in the posterior parietal cortex during NREM sleep interferes with consolidation of cue discrimination memory, demonstrating a physiological role for this NKX2-1-expressing interneuron type in memory consolidation.\",\n      \"method\": \"Single-cell electrophysiology, immunohistochemistry, optogenetic activation of ID2+Nkx2.1+ cells, memory consolidation behavioral assays\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — optogenetic manipulation with behavioral readout, single lab\",\n      \"pmids\": [\"33619404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CRISPRi-mediated functional analysis of NKX2-1 binding sites revealed that a subset of NKX2-1-binding sites are functionally indispensable while others are dispensable for target gene expression (genes including SFTPB, LAMP3, SFTPA1, SFTPA2, MYBPH, LMO3, CD274/PD-L1); this demonstrates unequal functional roles of NKX2-1 binding sites across proximal and distal genomic regions.\",\n      \"method\": \"CRISPRi (CRISPR/dCas9-KRAB), ChIP-seq, gene expression analysis of 19 NKX2-1-binding regions\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic CRISPRi screen of binding sites with gene expression readout, single lab\",\n      \"pmids\": [\"33980985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FoxA1/2 loss leads to aberrant NKX2-1 activity and genomic relocalization in NKX2-1-positive LUAD; loss of FoxA1/2 collapses a dual pulmonary/gastrointestinal transcriptional identity state, and aberrant NKX2-1 activity actively inhibits tumorigenesis and drives alternative cellular identity programs associated with non-proliferative states.\",\n      \"method\": \"Foxa1/2 conditional knockout in KRAS-driven mouse models, human cell lines, NKX2-1 ChIP-seq to assess genomic relocalization, transcriptomics\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP-seq showing genomic relocalization, multiple genetic models in vivo and in vitro\",\n      \"pmids\": [\"35835117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NKX2-1 directly binds and transcriptionally upregulates serine/glycine synthesis enzyme genes (PHGDH, PSAT1, PSPH, SHMT1/2), driving serine/glycine synthesis addiction in T-cell leukemia and lung cancer cells; NKX2-1-driven serine/glycine synthesis generates nucleotides and redox molecules, alters the cellular lipidome and methylome, and NKX2-1-expressing cells show enhanced sensitivity to serine/glycine conversion inhibition by sertraline.\",\n      \"method\": \"ChIP-qPCR for direct NKX2-1 binding to enzyme gene promoters, NKX2-1 overexpression/knockout models, mass spectrometry metabolomics, proliferation/invasion assays, mouse tumor models\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct ChIP binding combined with metabolomics, in vivo validation, and therapeutic relevance\",\n      \"pmids\": [\"36932191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NKX2-1 directly restricts expression of CXCL1, CXCL2, and CXCL5 chemokines in lung adenocarcinoma cells as revealed by ATAC-seq showing NKX2-1 occupancy at their promoters; NKX2-1 depletion triggers CXCL secretion that recruits tumor-promoting neutrophils via CXCR2 signaling, increasing tumor growth that is reversed by CXCR2 antagonist SB225002.\",\n      \"method\": \"ATAC-seq for chromatin accessibility at CXCL promoters, chemokine array, qRT-PCR, NKX2-1 knockdown in LUAD cells, syngeneic mouse model, single-cell RNA-seq, CXCR2 antagonist treatment\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ATAC-seq chromatin evidence of direct regulation combined with in vivo mouse model and single-cell sequencing\",\n      \"pmids\": [\"39113226\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NKX2-1 (TTF-1) is a homeodomain transcription factor that binds DNA via a NK-2-type homeodomain (preferentially recognizing 5'-CAAG-3' motifs), is phosphorylated and repressed by the Ras/Raf/MEK/ERK cascade, physically interacts with co-factors including TAZ, PAX8, GATA6, Foxa2, HOXB5, and LHX6 to cooperatively regulate tissue-specific gene expression, directly activates surfactant protein genes (SP-B, SP-C), WNT7b, PACAP, angiotensinogen, and serine/glycine synthesis enzymes, while repressing CXCL chemokines, Hmga2, and EMT-driving genes; in the developing lung and forebrain it controls morphogenesis, interneuron specification, and migration via direct repression of guidance receptors (Neuropilin-2), and in lung adenocarcinoma functions as a context-dependent lineage-survival oncogene and tumor suppressor whose genomic localization and activity are modulated by FoxA1/2 and whose loss activates CXCR2-dependent neutrophil recruitment and metastatic programs.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NKX2-1 is a homeodomain transcription factor that serves as a master regulator of lung, thyroid, and forebrain development and maintains lineage identity in adult tissues and cancer. It binds a 5'-CAAG-3' core DNA motif at promoters and distal regulatory elements, where it cooperates with tissue-specific partners — PAX8 and TAZ in thyroid, GATA6 and FOXA2 in lung epithelium, and LHX6 in cortical interneurons — to activate or repress distinct gene programs including surfactant proteins, thyroglobulin, WNT7b, guidance cues (Neuropilin-2, Slit2), and metabolic enzymes [PMID:10208743, PMID:11914369, PMID:18786357, PMID:27657450, PMID:19336474]. Its transcriptional activity is negatively regulated by direct ERK-mediated phosphorylation downstream of Ras/Raf/MEK signaling, and its genomic targeting in lung adenocarcinoma depends on the pioneer factors FoxA1/2, whose loss causes NKX2-1 redistribution to aberrant sites [PMID:10733581, PMID:35835117]. In lung adenocarcinoma NKX2-1 functions as both a lineage-survival factor — inducing ROR1 to sustain PI3K-AKT signaling — and a metastasis suppressor that represses Hmga2, CXCL chemokines, and other pro-invasion targets redundantly with Foxa2 and Cdx2 [PMID:22439932, PMID:21471965, PMID:26341558, PMID:39113226]. Heterozygous loss-of-function mutations in NKX2-1 cause brain-lung-thyroid syndrome (choreoathetosis, congenital hypothyroidism, and pulmonary disease) in humans [PMID:11854319].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Establishing that NKX2-1 (TTF-1) is a direct transcriptional activator of the thyroglobulin promoter resolved how thyroid-specific gene expression is controlled at the cis-regulatory level.\",\n      \"evidence\": \"DNase I footprinting of three TTF-1 binding sites plus site-directed mutagenesis in primary thyrocytes\",\n      \"pmids\": [\"1555648\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo validation of individual binding site contributions\", \"Mechanism of thyroid-specific restriction unknown\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Structural and biophysical characterization of the TTF-1 homeodomain revealed a three-helix fold with broad DNA-binding specificity centered on a 5'-CAAG-3' core motif, establishing the molecular basis for NKX2-1's ability to recognize diverse regulatory elements.\",\n      \"evidence\": \"NMR structure determination of the 68-residue homeodomain; affinity selection of binding sequences; CD thermal denaturation\",\n      \"pmids\": [\"8282100\", \"7957942\", \"7654238\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No full-length protein structure\", \"No co-crystal with DNA\", \"Functional significance of conformational flexibility not tested by mutagenesis\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Knockout mouse studies demonstrated that NKX2-1 is essential for tracheo-esophageal septation, distal lung branching morphogenesis, surfactant protein expression, and downstream Bmp-4 and ECM/VEGF gene regulation, establishing it as the central transcription factor of pulmonary development.\",\n      \"evidence\": \"Homozygous Nkx2.1 knockout mice with histology, in situ hybridization for Bmp-4, immunostaining for integrins and collagen IV\",\n      \"pmids\": [\"10208743\", \"10706142\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct versus indirect regulation of Bmp-4 and ECM targets not distinguished\", \"Cell-autonomous versus non-autonomous effects not separated\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of ERK-mediated phosphorylation at three serines as a mechanism that inhibits NKX2-1 transcriptional activity placed NKX2-1 downstream of Ras/Raf/MEK oncogenic signaling, explaining how mitogenic signals suppress differentiation programs.\",\n      \"evidence\": \"In vitro kinase assay, serine-to-alanine mutagenesis, MEK inhibitors, reporter assays\",\n      \"pmids\": [\"10733581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo phosphorylation stoichiometry not determined\", \"ERK-independent Ras pathway for TTF-1 repression not molecularly defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery that heterozygous NKX2-1 mutations cause brain-lung-thyroid syndrome in humans proved haploinsufficiency across three organ systems and unified the developmental roles into a single clinical entity.\",\n      \"evidence\": \"Human genetic analysis identifying heterozygous missense, nonsense, and deletion mutations in patients with the triad phenotype\",\n      \"pmids\": [\"11854319\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype correlation across mutation types incomplete\", \"Why some organs are more sensitive to haploinsufficiency than others not explained\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstration that NKX2-1 physically interacts with GATA6 and cooperates with FOXA2 to activate the WNT7b promoter established a combinatorial transcription factor model for lung-specific gene regulation.\",\n      \"evidence\": \"Co-immunoprecipitation of TTF-1 and GATA6, EMSA, co-transfection reporter assays with promoter truncations\",\n      \"pmids\": [\"11914369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide extent of GATA6-NKX2-1 co-regulation not mapped\", \"Whether WNT7b mediates branching downstream of NKX2-1 not tested in vivo\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Conditional loss-of-function in the MGE revealed that NKX2-1 specifies PV+ and SST+ cortical interneuron subtypes and controls their migration by directly repressing the guidance receptor Neuropilin-2, establishing a transcription-to-migration mechanism in interneuron development.\",\n      \"evidence\": \"Temporally controlled conditional KO in mouse MGE progenitors, ChIP for NKX2-1 at Neuropilin-2 locus, in utero electroporation, neurochemical subtype analysis\",\n      \"pmids\": [\"18786356\", \"18786357\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full repertoire of NKX2-1-regulated guidance cues not defined\", \"How NKX2-1 downregulation is triggered in cortically migrating interneurons unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of TAZ as a physical coactivator of both NKX2-1 and PAX8 on the thyroglobulin promoter, together with the demonstration that disease-associated NKX2-1 mutations differentially abolish PAX8 synergy, defined the cooperative transcription factor network governing thyroid differentiation.\",\n      \"evidence\": \"Co-immunoprecipitation in vitro/in vivo, reporter assays with NKX2-1 mutants and PAX8 co-transfection\",\n      \"pmids\": [\"19010321\", \"19336474\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TAZ bridges NKX2-1 and PAX8 in a ternary complex not tested\", \"Structural basis of mutation-specific PAX8 synergy loss unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Studies in lung adenocarcinoma established NKX2-1's dual role as a lineage-survival oncogene (via ROR1-mediated PI3K-AKT activation) and a metastasis suppressor (via repression of Hmga2), resolving the paradox of its context-dependent tumor functions.\",\n      \"evidence\": \"siRNA/overexpression/kinase-dead mutant analysis for ROR1 pathway; conditional gain/loss-of-function with in vivo transplant metastasis assays for Hmga2\",\n      \"pmids\": [\"22439932\", \"21471965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the balance between survival and suppressor programs is determined in individual tumors not explained\", \"Whether ROR1 mediates pro-survival signaling independently of NKX2-1's metastasis-suppressive functions not separated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Genome-wide ChIP-seq and ATAC-seq revealed that NKX2-1 establishes zone-specific chromatin states in the developing forebrain — repressive in the ventricular zone, permissive in the subventricular/mantle zone — and that combinatorial NKX2-1 + LHX6 binding drives transcriptional activation in migrating interneurons.\",\n      \"evidence\": \"ChIP-seq, ATAC-seq, RNA-seq in Nkx2-1 mutant MGE tissue\",\n      \"pmids\": [\"27657450\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which NKX2-1 switches from repressor to activator in different zones not defined\", \"Cofactors mediating repression in the VZ not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Systematic CRISPRi targeting of NKX2-1 binding sites showed that only a subset are functionally required for target gene expression, indicating that NKX2-1's genomic occupancy is not equivalent to functional regulation.\",\n      \"evidence\": \"CRISPRi (dCas9-KRAB) targeting 19 NKX2-1 ChIP-seq peaks with gene expression readout\",\n      \"pmids\": [\"33980985\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chromatin context determining which sites are functional not defined\", \"Whether dispensable sites contribute under stress or differentiation conditions untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstration that FoxA1/2 loss causes NKX2-1 genomic redistribution and paradoxical tumor suppression established that pioneer factors FoxA1/2 are required to direct NKX2-1 to its pro-tumorigenic genomic targets in lung adenocarcinoma.\",\n      \"evidence\": \"FoxA1/2 conditional KO in KRAS-driven mouse models, NKX2-1 ChIP-seq showing redistributed binding, gene expression profiling\",\n      \"pmids\": [\"35835117\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of aberrant NKX2-1 targets that suppress tumorigenesis not fully characterized\", \"Whether other pioneer factors can substitute for FoxA1/2 unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Direct transcriptional upregulation of serine/glycine biosynthesis enzymes by NKX2-1 revealed a metabolic reprogramming function enabling cancer cell proliferation under nutrient stress, extending NKX2-1's role beyond lineage specification to metabolic adaptation.\",\n      \"evidence\": \"ChIP-qPCR, NKX2-1 overexpression/knockdown/knockout, mass spectrometry metabolomics, mouse tumor models\",\n      \"pmids\": [\"36932191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this metabolic function operates in normal lung epithelium unknown\", \"Relative contribution of individual metabolic targets to tumor fitness not dissected\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for NKX2-1's context-dependent switching between activation and repression, the full cofactor repertoire determining tissue-specific chromatin targeting, and how NKX2-1 phosphorylation by ERK and other kinases is integrated with pioneer factor availability in tumors.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length NKX2-1 structure or NKX2-1–DNA co-crystal exists\", \"Mechanism of VZ repression versus SVZ/mantle activation not molecularly resolved\", \"Integration of ERK phosphorylation with FoxA1/2-dependent genomic targeting not studied\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [32, 33, 4, 13, 20, 24, 35]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 4, 5, 14, 15, 18, 24, 25, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 13, 24, 30]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1, 8, 9, 12, 13, 19, 23, 24]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [4, 14, 15, 20, 24, 29, 33, 35]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 17, 26]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [17, 18, 20, 22, 26, 27, 28, 29]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [8, 11, 12, 13, 19]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"PAX8\",\n      \"GATA6\",\n      \"FOXA2\",\n      \"LHX6\",\n      \"TAZ\",\n      \"HOXB5\",\n      \"FOXA1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"NKX2-1 (TTF-1) is a homeodomain transcription factor that serves as a master regulator of lineage identity in the lung, thyroid, and forebrain, coordinating morphogenesis, cell-type specification, and differentiated gene expression programs. It binds DNA via an NK-2-type homeodomain preferring 5'-CAAG-3' core motifs and directly activates surfactant protein genes (SP-B, SP-C), thyroglobulin, WNT7b, PACAP, angiotensinogen, ROR1, RET, and serine/glycine biosynthetic enzymes, while repressing Hmga2, CXCL chemokines, Neuropilin-2, and EMT-driving genes through context-dependent recruitment of co-factors including PAX8, TAZ, GATA6, FoxA1/2, LHX6, and HOXB5 [PMID:1976511, PMID:7559607, PMID:12441357, PMID:14970209, PMID:27657450, PMID:39113226]. Its transcriptional activity is negatively regulated by Ras/Raf/MEK/ERK-mediated phosphorylation at three serine residues and by TGF-β signaling, and its genomic occupancy is redirected upon loss of pioneer factors FoxA1/2 [PMID:10733581, PMID:18602626, PMID:35835117]. Heterozygous loss-of-function mutations cause brain-lung-thyroid syndrome (congenital hypothyroidism, choreoathetosis, and pulmonary disease) and benign hereditary chorea, while in lung adenocarcinoma NKX2-1 functions as a context-dependent lineage-survival oncogene when amplified and a tumor suppressor whose loss unleashes metastatic programs, mucinous differentiation, and CXCR2-dependent neutrophil recruitment [PMID:11854319, PMID:11971878, PMID:21471965, PMID:23143308, PMID:39113226].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Identification of TTF-1 as a homeodomain-containing thyroid/lung nuclear factor established a new tissue-specific transcription factor family and placed NKX2-1 at the intersection of thyroid and pulmonary gene regulation.\",\n      \"evidence\": \"cDNA cloning, DNA-binding assays with thyroid nuclear extracts, chromosomal mapping to human chr14\",\n      \"pmids\": [\"1976511\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo loss-of-function data\", \"DNA-binding specificity not yet defined at nucleotide level\", \"Lung function of TTF-1 not yet demonstrated\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Structural and biophysical characterization of the TTF-1 homeodomain revealed a canonical helix-turn-helix fold with unusual conformational flexibility, linking structural dynamics to DNA-binding activity.\",\n      \"evidence\": \"NMR structure determination and CD-monitored thermal/urea unfolding of recombinant TTF-1 homeodomain\",\n      \"pmids\": [\"8282100\", \"7957942\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-crystal structure with DNA\", \"Structural basis for target gene selectivity unknown\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Definition of the 5'-CAAG-3' core binding motif and demonstration that TTF-1 directly transactivates the surfactant protein B gene extended TTF-1 function from thyroid to pulmonary epithelial gene regulation.\",\n      \"evidence\": \"SELEX-based binding site selection; reporter assays with site-directed mutagenesis of SP-B enhancer TTF-1 sites in lung cells\",\n      \"pmids\": [\"7654238\", \"7559607\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide binding landscape unknown\", \"Mechanism of tissue-selective activation (thyroid vs. lung) not resolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Nkx2.1-null mice revealed an essential non-redundant role in foregut septation, distal lung morphogenesis, and surfactant gene expression, establishing NKX2-1 as a master regulator of lung development.\",\n      \"evidence\": \"Targeted gene disruption in mice; histological and molecular analysis of null embryos showing tracheoesophageal and pulmonary defects\",\n      \"pmids\": [\"10208743\", \"10706142\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream transcriptional network in lung morphogenesis largely uncharacterized\", \"Mechanism linking NKX2-1 to Bmp-4 regulation not established\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Discovery that the Ras/Raf/MEK/ERK cascade directly phosphorylates TTF-1 at three serine residues to repress its activity identified a key post-translational regulatory axis, connecting oncogenic signaling to loss of differentiated function.\",\n      \"evidence\": \"In vitro ERK kinase assay, in vivo phosphorylation analysis, serine-to-alanine mutagenesis abolishing phosphorylation, MEK inhibitor rescue\",\n      \"pmids\": [\"10733581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of ERK-independent Ras pathway repressing TTF-1 not resolved\", \"Structural basis for phosphorylation-mediated repression unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of NKX2-1 loss-of-function mutations in patients with brain-lung-thyroid syndrome and benign hereditary chorea established NKX2-1 haploinsufficiency as the genetic cause of a multi-organ developmental disorder, validated by heterozygous knockout mice.\",\n      \"evidence\": \"Mutation screening in BHC and congenital hypothyroidism families; heterozygous Ttf1 knockout mouse phenotyping; functional assays showing loss of DNA binding and transactivation\",\n      \"pmids\": [\"11854319\", \"11854318\", \"11971878\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype correlations for specific mutations incomplete\", \"Mechanism of selective basal ganglia vulnerability unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstration of direct physical interactions between TTF-1 and co-factors PAX8, GATA6, and FoxA2 on thyroid and lung target promoters (thyroglobulin, WNT7b) revealed the combinatorial transcriptional logic underlying tissue-specific gene activation.\",\n      \"evidence\": \"GST pull-down with purified proteins, co-immunoprecipitation, EMSA, cooperative transactivation assays on thyroglobulin and WNT7b promoters\",\n      \"pmids\": [\"12441357\", \"11914369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of TTF-1–PAX8 interaction unknown\", \"Relative contributions of each co-factor in vivo not dissected\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of TAZ as a direct co-activator of TTF-1 binding through the N-terminal domain provided a mechanistic link between Hippo pathway effectors and NKX2-1-dependent transcription in lung and thyroid.\",\n      \"evidence\": \"Mammalian two-hybrid, pull-down domain mapping, cooperative SP-C and thyroglobulin reporter activation\",\n      \"pmids\": [\"14970209\", \"19010321\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TAZ modulates NKX2-1 chromatin occupancy genome-wide untested\", \"In vivo requirement for TAZ–NKX2-1 interaction not demonstrated genetically\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Conditional knockout studies demonstrated that Nkx2-1 controls temporal specification and migration of cortical interneurons by directly repressing the guidance receptor Neuropilin-2, establishing a postmitotic transcriptional switch governing neuronal fate and migration.\",\n      \"evidence\": \"Temporally controlled conditional KO in mouse MGE progenitors; ChIP and reporter assays for Neuropilin-2; in utero electroporation migration assays\",\n      \"pmids\": [\"18786356\", \"18786357\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full set of NKX2-1 direct targets in postmitotic interneurons not catalogued\", \"Mechanism of Nkx2-1 downregulation in cortex-destined interneurons unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of NKX2-1 as both a lineage-survival oncogene (when amplified) and a metastasis suppressor (through Hmga2 repression) resolved its paradoxical dual role in lung adenocarcinoma and established the concept of context-dependent lineage transcription factor activity in cancer.\",\n      \"evidence\": \"Lentiviral mouse LUAD model with gain/loss-of-function; siRNA knockdown in amplified cell lines; Hmga2 rescue experiments; genomic profiling of 128 tumors\",\n      \"pmids\": [\"21471965\", \"18212743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which NKX2-1 amplification switches from tumor-suppressive to oncogenic function incompletely defined\", \"Patient-level biomarker validation of NKX2-1 status for prognosis limited\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"ChIP-seq revealed genome-wide NKX2-1 occupancy at AP-1 elements in mucinous lung tumors and demonstrated that NKX2-1 haploinsufficiency with Kras activation drives mucinous adenocarcinoma, establishing the mechanistic basis of NKX2-1's tumor-suppressive activity against Kras-driven mucinous differentiation.\",\n      \"evidence\": \"ChIP-seq in Nkx2-1 haploinsufficient/Kras(G12D) mouse models; AP-1 reporter inhibition assays; colony formation assays\",\n      \"pmids\": [\"23143308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NKX2-1 directly sequesters AP-1 or modulates its chromatin access unclear\", \"Therapeutic strategies to restore NKX2-1 function not explored\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Integrated ChIP-seq and ATAC-seq in the developing forebrain revealed that NKX2-1 acts as a dual-function chromatin regulator — repressing genes by closing chromatin in the ventricular zone while activating genes via permissive chromatin together with LHX6 in migrating interneurons — resolving how a single factor achieves context-dependent transcriptional outcomes.\",\n      \"evidence\": \"NKX2-1 ChIP-seq, ATAC-seq, RNA-seq in developing mouse forebrain, conditional KO validation\",\n      \"pmids\": [\"27657450\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors mediating repressive vs. activating mode in brain not fully identified\", \"Whether this dual chromatin mechanism operates similarly in lung and thyroid untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"FoxA1/2 were shown to direct NKX2-1 genomic localization; their loss causes aberrant NKX2-1 redistribution that paradoxically inhibits tumorigenesis, establishing that pioneer factor availability dictates NKX2-1's oncogenic versus tumor-suppressive output.\",\n      \"evidence\": \"Conditional Foxa1/2 knockout in Kras-driven mouse LUAD; NKX2-1 ChIP-seq showing genomic relocalization; transcriptomics in mouse and human cells\",\n      \"pmids\": [\"35835117\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which chromatin features recruit relocalized NKX2-1 unknown\", \"Whether therapeutic modulation of FoxA1/2 can redirect NKX2-1 activity untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"NKX2-1 was found to directly activate serine/glycine biosynthesis enzyme genes, revealing an unexpected metabolic programming function that creates a therapeutically exploitable metabolic vulnerability in NKX2-1-expressing cancers.\",\n      \"evidence\": \"ChIP-qPCR for NKX2-1 at PHGDH/PSAT1/PSPH/SHMT promoters; metabolomics; sertraline sensitivity assays in lung cancer and T-ALL models\",\n      \"pmids\": [\"36932191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether metabolic reprogramming contributes to NKX2-1's developmental functions unknown\", \"Clinical validation of sertraline sensitivity in NKX2-1-positive tumors lacking\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"NKX2-1 was shown to directly repress CXCL chemokines, and its loss triggers CXCR2-dependent neutrophil recruitment that promotes tumor growth, connecting NKX2-1 loss to immune microenvironment remodeling in lung adenocarcinoma.\",\n      \"evidence\": \"ATAC-seq showing NKX2-1 occupancy at CXCL promoters; NKX2-1 knockdown in syngeneic mouse LUAD; scRNA-seq; CXCR2 antagonist rescue\",\n      \"pmids\": [\"39113226\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NKX2-1 regulates other immune cell populations beyond neutrophils untested\", \"Interaction between NKX2-1-mediated immune control and checkpoint immunotherapy unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for NKX2-1's context-dependent activator/repressor switching, the full catalog of cofactors determining its mode in each tissue, and whether its metabolic and immune-regulatory functions contribute to developmental morphogenesis beyond cancer.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-crystal structure of NKX2-1 with DNA or cofactors\", \"Comprehensive comparison of NKX2-1 cistrome across lung, thyroid, and brain in matched conditions lacking\", \"Therapeutic strategies to restore NKX2-1 function in NKX2-1-loss tumors not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 2, 4, 5]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 5, 12, 15, 19, 20, 21, 32, 42, 48, 49]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 6, 21, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 5, 12, 15, 19, 42, 46]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8, 10, 25, 26]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11, 30, 36, 44]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [32, 33, 37, 41, 47, 49]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [17, 25, 26, 34, 45]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [49]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"PAX8\",\n      \"TAZ\",\n      \"GATA6\",\n      \"FOXA2\",\n      \"HOXB5\",\n      \"LHX6\",\n      \"FOXA1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}