{"gene":"NFIB","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1997,"finding":"NFI-B3, a truncated isoform of NFIB generated by failure to excise the first intron and use of an intron-internal polyadenylation signal, lacks independent DNA-binding and transcriptional activity but forms heterodimers with other NFI family members (NFI-B, -C, -X), reducing their DNA-binding activity and thereby repressing their transcriptional activation in a dominant-negative manner.","method":"Alternative RNA processing characterization, SL-2 cell transfection reporter assays, gel-shift (EMSA) analysis of heterodimer DNA binding","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro functional assays (transcription reporter + EMSA), mutagenesis-level mechanistic dissection, single lab but multiple orthogonal methods","pmids":["9099724"],"is_preprint":false},{"year":1990,"finding":"NFIB (NFI-B) is one of at least three independent NFI gene family members encoding site-specific transcription factors with identical DNA-binding specificity (TGGCA motif); functional diversity is generated through differential RNA splicing from each gene.","method":"Peptide microsequencing, PCR-supported cDNA cloning, sequence alignment across species","journal":"Nucleic Acids Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical cloning and sequencing with cross-species validation, but no direct functional reconstitution of DNA binding for NFIB specifically","pmids":["2339052"],"is_preprint":false},{"year":2005,"finding":"Nfib is essential for late fetal lung maturation and forebrain development; Nfib-deficient mice die perinatally with severe lung hypoplasia, agenesis of the corpus callosum, basilar pons formation defects, and hippocampal developmental defects. Heterozygous animals exhibit haploinsufficiency (callosal agenesis and delayed lung maturation), indicating a gene dosage requirement.","method":"Nfib knockout mouse model; histology, immunohistochemistry, neuroanatomical analysis","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined multi-organ phenotypic readouts, replicated across heterozygous and homozygous animals","pmids":["15632069"],"is_preprint":false},{"year":2002,"finding":"Nfib null mutants display severe lung hypoplasia and die early postnatally; TGF-β1 and Sonic hedgehog (Shh) expression are not down-regulated in mutant lung epithelium at late morphogenesis stages, suggesting NFIB normally represses these signals to permit lung maturation.","method":"Nfib knockout mouse model; histology, in situ hybridization / expression analysis of TGF-β1 and Shh","journal":"Mechanisms of Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO model with defined lung phenotype and candidate pathway identification, single lab","pmids":["11850179"],"is_preprint":false},{"year":2009,"finding":"In Nfib-deficient mice, corpus callosum agenesis arises through non-cell-autonomous mechanisms: midline radial progenitors fail to differentiate into mature glia (without abnormal proliferation or apoptosis), and cingulate neurons show reduced neuropilin-1 expression causing failure of pioneer axons to cross the midline.","method":"Nfib knockout mouse; retrograde tracer labeling, immunohistochemistry, cell proliferation and apoptosis assays","journal":"Neural Development","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (tracer labeling, IHC, proliferation/apoptosis assays) in KO model establishing mechanism","pmids":["19961580"],"is_preprint":false},{"year":2009,"finding":"NFI-B expression is specifically restricted to mossy fiber populations of the precerebellar system; in Nfib(-/-) mice, basilar pontine nuclei development is delayed with fewer pontine neurons produced and slower migration, while Nfia and Nfix null mice show no pontine phenotype—demonstrating functional specificity of NFIB among NFI family members.","method":"Immunohistochemistry in Nfib, Nfia, and Nfix knockout mice; neuronal migration analysis","journal":"The Journal of Comparative Neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple KO models compared, clean cell-type-specific phenotype, genetic specificity established by cross-comparison","pmids":["19107796"],"is_preprint":false},{"year":2013,"finding":"NFIB in hair follicle stem cells (HFSCs) suppresses melanocyte stem cell (McSC) proliferation and differentiation by repressing endothelin 2 (Edn2) transcription; conditional deletion of Nfib in HFSCs leads to ectopic Edn2 upregulation, which promotes McSC differentiation. KIT-ligand from dermal papilla is identified as an additional signal, and endothelin receptor antagonists or KIT-blocking antibodies prevent precocious McSC differentiation in NFIB-deficient mice.","method":"HFSC-specific Nfib conditional knockout mouse; ChIP-seq, transcriptional profiling, pharmacological rescue with endothelin receptor antagonists and KIT antibodies","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — conditional KO with defined phenotype, ChIP-seq identifying direct target (Edn2), pharmacological rescue; multiple orthogonal methods in single rigorous study","pmids":["23389444"],"is_preprint":false},{"year":2014,"finding":"NFIB directly binds the Ezh2 promoter and represses Ezh2 transcription; loss of Nfib in mice results in increased EZH2 expression in the neocortex and hippocampus, increased proliferating ventricular zone progenitors expressing progenitor markers, and misregulation of downstream EZH2 epigenetic targets—demonstrating NFIB as a transcriptional repressor of Ezh2 during cortical development.","method":"Nfib knockout mouse; ChIP assay showing NFIB binding to Ezh2 promoter; NFIB overexpression reporter assay; immunohistochemistry for EZH2 and progenitor markers","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP + overexpression reporter + KO phenotype, multiple orthogonal methods establishing direct transcriptional repression","pmids":["24553933"],"is_preprint":false},{"year":2014,"finding":"NFIB co-occupies genomic binding sites with STAT5 and androgen-receptor/FOXA1 at composite regulatory elements marked by enhancer histone modifications; NFIB loss combined with STAT5 loss prevents formation of functional mammary alveoli, and ChIP-seq demonstrates NFIB-STAT5 co-binding at a shared set of mammary-specific gene regulatory elements.","method":"Mammary-specific Nfib conditional knockout mouse; ChIP-seq for NFIB and STAT5; gene expression analysis; integration with published HFSC ChIP-seq datasets","journal":"Molecular Endocrinology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — conditional KO with defined phenotype, ChIP-seq showing direct co-occupancy, genetic epistasis between NFIB and STAT5","pmids":["24678731"],"is_preprint":false},{"year":2015,"finding":"NFIB binding sites in LNCaP prostate cancer cells overlap with 64.3% of AR and FOXA1 binding sites by ChIP-seq; NFIB knockdown increases AR expression and superinduces a subset of AR target genes; loss of Nfib in mouse prostate (rescued via renal capsule engraftment) causes prostatic hyperplasia that does not resolve after castration, identifying NFIB as a co-regulator of AR signaling.","method":"ChIP-seq in LNCaP cells; NFIB siRNA knockdown; mouse Nfib knockout tissue engraftment under renal capsule; immunohistochemistry","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP-seq + genetic KO + functional rescue model, multiple orthogonal methods","pmids":["26677878"],"is_preprint":false},{"year":2016,"finding":"Nfib copy number amplification in SCLC metastases correlates with widespread opening of distal chromatin regulatory elements enriched for NFIB binding sites; Nfib is necessary and sufficient to increase chromatin accessibility at intergenic regions and drives pro-metastatic neuronal gene expression programs in SCLC cells.","method":"Genetically engineered mouse model of SCLC; ATAC-seq for chromatin accessibility; genome-wide NFIB binding site analysis; Nfib overexpression and knockdown in SCLC cell lines","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genome-wide chromatin accessibility (ATAC-seq) + genetic gain/loss-of-function + copy number analysis; replicated across mouse model and human data","pmids":["27374332"],"is_preprint":false},{"year":2016,"finding":"NFIB overexpression in Rb1/Trp53-deleted SCLC mouse models specifically promotes metastatic spread and expansion of an E-cadherin-negative invasive cell population, while both NFIB and MYCL overexpression accelerate tumor growth; suppression of Nfib in cell lines increases apoptosis and inhibits proliferation; transcriptional analysis shows Nfib regulates axon guidance, focal adhesion, and extracellular matrix receptor interaction genes.","method":"Rb1/p53-deficient SCLC mouse model with doxycycline-inducible Nfib overexpression; Nfib knockdown in SCLC cell lines; transcriptional profiling","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse model gain-of-function + cell line loss-of-function + transcriptional profiling; replicated findings across two independent SCLC models","pmids":["27373156"],"is_preprint":false},{"year":2016,"finding":"Drosha directly targets NFIB mRNA to repress its expression independently of Dicer and microRNAs in adult hippocampal NSCs; deletion of Drosha activates NFIB expression, which in turn activates oligodendrogenesis at the expense of neurogenesis; NFIB knockdown in Drosha-deficient NSCs restores neurogenesis, placing NFIB downstream of Drosha as the key effector of lineage restriction.","method":"Conditional Drosha deletion in adult dentate gyrus NSCs; NFIB knockdown rescue experiments; Dicer-independent mechanism confirmed by genetic controls","journal":"Cell Stem Cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO + genetic rescue epistasis in vivo, Dicer-independence established, clean cell fate phenotype","pmids":["27545503"],"is_preprint":false},{"year":2017,"finding":"NFIB acts downstream of BRN2 in melanoma cells to promote invasion; NFIB upregulates EZH2, which epigenetically represses MITF, thereby driving an invasive, less-proliferative melanoma phenotype. NFIB knockdown reduces migration and invasion, and EZH2 knockdown phenocopies NFIB loss.","method":"NFIB and EZH2 knockdown/overexpression in melanoma cells; migration and invasion assays; Western blot for MITF and EZH2","journal":"EBioMedicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain/loss-of-function with mechanistic follow-up (EZH2→MITF axis), single lab, multiple cell phenotype readouts","pmids":["28119061"],"is_preprint":false},{"year":2017,"finding":"NFIB transcriptionally activates Nfix expression in the spinal cord; in the absence of Nfia or Nfib, NFIX expression is markedly reduced, and in vitro NFIB overexpression drives Nfix promoter activity, establishing a hierarchical auto-regulatory cascade: NFIB → NFIX in spinal cord gliogenesis.","method":"Nfia and Nfib knockout mice; in vitro Nfix promoter reporter assay with NFIB overexpression; immunohistochemistry","journal":"Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO phenotype plus in vitro reporter assay confirming direct transcriptional activation, single lab","pmids":["29106906"],"is_preprint":false},{"year":2017,"finding":"NFIB and YBX1 physically interact with the ESR1-FOXA1 complex and inhibit ESR1 transactivational potential; FGFR2 signaling augments these interactions and further represses ESR1 target gene expression.","method":"Co-immunoprecipitation of NFIB and YBX1 with ESR1/FOXA1; ESR1 transcriptional reporter assays; FGFR2 signaling modulation","journal":"Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying novel protein-protein interaction + functional reporter assay, single lab","pmids":["29180470"],"is_preprint":false},{"year":2017,"finding":"NFIA and NFIB are co-expressed in the developing cerebral cortex, can form heterodimers in vivo (detected by co-immunoprecipitation), and function additively: compound heterozygous loss of both genes causes a cortical phenotype similar to single homozygous knockouts, while double homozygous loss causes a more severe phenotype with greater ventricular enlargement and fewer differentiated glia and neurons.","method":"Compound Nfia/Nfib knockout mouse models; co-immunoprecipitation; immunofluorescence; gene expression analysis; MRI","journal":"Brain and Neuroscience Advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishing in vivo heterodimerization + graded genetic KO phenotype, single lab","pmids":["32166136"],"is_preprint":false},{"year":2018,"finding":"NFIB directly binds the CDKN1A (p21) promoter in TP53-mutated TNBC cells and suppresses p21 transcription; NFIB depletion induces CDKN1A expression, cell cycle arrest, apoptosis, and enhanced docetaxel sensitivity; combined knockdown of p21 and NFIB reverses the drug-sensitization, placing NFIB's effect upstream of p21.","method":"ChIP assay showing NFIB occupancy at CDKN1A promoter; siRNA knockdown; combined NFIB/p21 knockdown rescue; cell death and drug sensitivity assays","journal":"The Journal of Pathology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP demonstrating direct promoter binding + genetic epistasis (double KD rescue) + multiple functional readouts","pmids":["30350349"],"is_preprint":false},{"year":2018,"finding":"NFIB haploinsufficiency in humans (point mutations creating premature stop codons or single-nucleotide variants) causes intellectual disability with macrocephaly; in vitro reporter assays confirm loss of transcriptional activity of variant proteins. Cortex-specific Nfib conditional knockout mice exhibit enlarged cerebral cortex, confirming macrocephaly as a functional consequence of NFIB loss.","method":"Human genetic cohort with NFIB variants; in vitro transcriptional reporter assay for variant NFIB proteins; Nfib cortex-specific conditional KO mouse; MRI and histology","journal":"American Journal of Human Genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro functional assay of human variants + mouse KO model with MRI-validated macrocephaly, multiple orthogonal methods","pmids":["30388402"],"is_preprint":false},{"year":2019,"finding":"NFIB promotes ITGA6 transcription in colorectal cancer cells; ChIP assay demonstrates NFIB occupancy at the ITGA6 promoter, and this transcriptional activation mediates the metastasis-promoting effect of NFIB.","method":"ChIP assay for NFIB binding to ITGA6 promoter; luciferase reporter and NFIB knockdown functional assays in CRC cells","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional knockdown, single lab, one direct target validated","pmids":["31754405"],"is_preprint":false},{"year":2020,"finding":"NFIB activates PLAG1 and HMGA2 in pleomorphic adenoma via promoter-swapping gene fusions (NFIB-PLAG1 and HMGA2-NFIB chimeric transcripts); super-enhancers in the NFIB locus are translocated upstream of PLAG1 or downstream of HMGA2, constituting an enhancer-hijacking mechanism.","method":"RNA-seq and RT-PCR identification of fusion transcripts; chromatin landscape analysis (super-enhancer mapping) around NFIB locus","journal":"Genes, Chromosomes & Cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-seq fusion characterization + super-enhancer mapping, mechanistic model inferred from genomic data, single lab","pmids":["32654217"],"is_preprint":false},{"year":2020,"finding":"KDM4D histone demethylase physically interacts with NFIB and the MLL1 complex; KDM4D demethylates H3K9me3, which is required for NFIB and MLL1 to deposit H3K4me3 and activate PPARγ and C/EBPα transcription during adipogenesis. NFIB and MLL1 complex bind target promoters independently of KDM4D.","method":"Co-immunoprecipitation of KDM4D with NFIB and MLL1; ChIP for H3K9me3, H3K4me3, NFIB, and MLL1 at target promoters; rescue experiments in KDM4D-depleted cells","journal":"Scientific Reports","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — Co-IP + ChIP establishing physical and functional interaction + mechanistic rescue, multiple orthogonal methods","pmids":["32080306"],"is_preprint":false},{"year":2021,"finding":"NFIB directly increases expression of ERO1A, which enhances HIF1α-VEGFA-mediated angiogenesis and lung metastatic colonization of breast cancer; overexpression of NFIB alone (via piggyBac transposon) is sufficient to enhance primary mammary tumor growth and lung metastasis.","method":"Inducible piggyBac transposon screen; NFIB overexpression in mammary tumor model; ChIP or promoter assays for ERO1A; in vivo lung colonization assays","journal":"EMBO Molecular Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function in vivo + mechanistic pathway identification (NFIB→ERO1A→HIF1α-VEGFA), single lab","pmids":["33751828"],"is_preprint":false},{"year":2022,"finding":"NFIB regulates CYP2D6 gene expression in the liver; NFIB inhibits CYP2D6 transcription in Huh7 cells and 3D liver spheroids; carriers of NFIB rs28379954 T>C allele have reduced nuclear NFIB expression and elevated CYP2D6-dependent risperidone hydroxylation in vivo.","method":"NFIB overexpression in Huh7 cells and 3D liver spheroids; genotyping of 604 risperidone-treated patients for CYP2D6 and NFIB; translational pharmacogenomic study","journal":"Clinical Pharmacology and Therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro functional assay plus in vivo pharmacogenomic confirmation, two orthogonal methods, single research group","pmids":["35253216"],"is_preprint":false},{"year":2022,"finding":"NFIB directly binds the NDUFA4L2 promoter and promotes its transcription, thereby reducing sorafenib-induced reactive oxygen species accumulation and promoting sorafenib resistance in hepatocellular carcinoma.","method":"ChIP assay confirming NFIB binding to NDUFA4L2 promoter; gene expression profiling; NFIB knockdown with ROS measurement; in vivo tumor growth assay","journal":"Cancer Science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional knockdown and ROS measurement, single lab","pmids":["36369883"],"is_preprint":false},{"year":2023,"finding":"CARM1 methylates NFIB and acts as its coactivator; TRIM29 is an effector molecule that reads methylated NFIB. Both CARM1 and the CARM1 methylation site on NFIB are required for rapid SCLC onset in a mouse model, and CARM1/methylated-NFIB maintain open chromatin states in tumors.","method":"Biochemical substrate identification of NFIB as CARM1 substrate; TRIM29 pulldown as effector of methylated NFIB; SCLC mouse model with CARM1 KO and NFIB methylation-site mutant; ATAC-seq for chromatin accessibility","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical methylation assay + effector pulldown + in vivo mouse model + chromatin profiling, multiple orthogonal methods in single rigorous study","pmids":["36690626"],"is_preprint":false},{"year":2023,"finding":"NFIB physically associates with the pre-replication complex (pre-RC) in mammalian cells, increases chromatin accessibility at replication origins by binding and opening nucleosomes (shown by nucleosome binding assay and single-molecule magnetic tweezers), and promotes nucleosome eviction on parental chromatin (TEM). NFIB deficiency alters chromosome contacts/compartments in G1 and S phase and impairs firing of a subset of early-replication origins. Cancer-associated NFIB overexpression provokes gene duplication and genomic alterations.","method":"Co-immunoprecipitation of NFIB with pre-RC components; ATAC-seq; nucleosome binding assay; single-molecule magnetic tweezers; transmission electron microscopy; Hi-C for chromosome contacts","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution-level biochemistry (nucleosome binding, single-molecule tweezers, TEM) plus genome-wide chromatin/replication profiling, multiple orthogonal methods","pmids":["37604829"],"is_preprint":false},{"year":2021,"finding":"NFIB directly binds to gene promoters of CDH1 (E-cadherin) and VIM (vimentin) and regulates their transcription independently of canonical EMT transcription factors; elevated m6A modification of NFIB mRNA in AR-negative CRPC recruits YTHDF2 to increase NFIB mRNA stability, while reduced TRIM8 (due to m6A modification of its own mRNA) further stabilizes NFIB protein, collectively promoting EMT and metastasis.","method":"ChIP assay for NFIB binding to CDH1 and VIM promoters; m6A-seq and YTHDF2 RIP; TRIM8 co-immunoprecipitation; NFIB knockdown migration assays; in vivo metastasis model","journal":"Cancer Research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP for direct promoter binding + m6A/YTHDF2 mechanism + TRIM8 interaction + in vivo validation, multiple orthogonal methods","pmids":["38536119"],"is_preprint":false},{"year":2015,"finding":"HIV-1 infection induces NFIB expression, and NFIB associates with the HIV-1 LTR region (−386 to −453 nt) as shown by ChIP assay; this association negatively correlates with HIV-1 transcription, and NFIB knockdown increases HIV-1 replication, indicating NFIB functions as a repressor of HIV-1 transcription.","method":"ChIP assay for NFIB binding to HIV-1 LTR; NFIB knockdown in T-cell lines (J1.1, J-Lat-Tat-GFP); viral replication quantification","journal":"Viruses","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional knockdown in two cell models, single lab","pmids":["25664610"],"is_preprint":false},{"year":2021,"finding":"Overexpression of NFIB in human pluripotent stem cell-derived neural precursor cells is sufficient to rapidly induce astrocyte differentiation in 2 weeks; MAPK pathway activity is necessary for this NFIB-driven astrogliogenesis.","method":"NFIB overexpression in hPSC-derived NPCs; RNA-seq transcriptomics; MAPK pathway inhibitor experiments; functional astrocyte assays","journal":"Journal of Cellular Physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function in human cells + pathway inhibitor + transcriptomic validation, single lab","pmids":["33949692"],"is_preprint":false},{"year":2023,"finding":"NFIB promotes colorectal cancer cell proliferation by inhibiting miR-182-5p, which normally targets and suppresses NAMPT (the NAD+ salvage synthesis rate-limiting enzyme); thus NFIB maintains NAD+ levels to sustain proliferation, and NMN supplementation rescues proliferation in NFIB-knockdown cells.","method":"NFIB knockdown with NAD+ measurement; miR-182-5p reporter assays; NMN rescue experiment; in vivo tumor growth assay","journal":"Communications Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function + metabolic rescue + reporter assay, single lab, pathway placement established","pmids":["37491379"],"is_preprint":false},{"year":2021,"finding":"NFIB directly binds to the PINK1 promoter and regulates PINK1 transcription in kidney renal clear cell carcinoma (KIRC), promoting tumor progression and metastasis; ChIP experiments confirm NFIB occupancy at the PINK1 promoter.","method":"ChIP assay for NFIB binding to PINK1 promoter; NFIB knockdown proliferation and migration assays; in vivo tumor progression experiments","journal":"PeerJ","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional knockdown, single lab, one direct target validated","pmids":["33981484"],"is_preprint":false},{"year":2021,"finding":"NFIB transcriptionally activates RIP2 gene expression by binding to its core promoter region (−2300 to −1839 bp), as confirmed by dual-luciferase reporter assay and ChIP-PCR; NFIB overexpression exacerbates APEC-induced apoptosis and inflammation via RIP2-mediated NF-κB signaling.","method":"Dual-luciferase reporter assay; ChIP-PCR for NFIB binding to RIP2 promoter; NFIB overexpression and RIP2 knockdown in chicken HD11 cells","journal":"International Journal of Molecular Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-PCR + reporter assay + genetic epistasis via RIP2 knockdown rescue, single lab","pmids":["35409172"],"is_preprint":false},{"year":2014,"finding":"ChIP-seq of NFIB in mouse lung at E16.5 confirms that NFIB binds in vivo to the same NFI motif identified in vitro; NFIB binding is over-represented in promoters of genes under-expressed in Nfib-KO mice, indicating an activator role; NFIB and glucocorticoid receptor (Nr3c1) co-regulate an overlapping set of 52 genes (~13x greater than chance) during lung maturation.","method":"ChIP-seq for NFIB in mouse lung; motif analysis; integration with Nr3c1-KO microarray data","journal":"BMC Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq in vivo establishing DNA-binding specificity + computational cross-comparison with KO datasets, single lab","pmids":["24661679"],"is_preprint":false},{"year":2016,"finding":"NFIB expression in patient-derived GBM cells (classical and mesenchymal subtypes) activates phospho-STAT3 signaling; ectopic NFIB expression inhibits tumourigenesis in these subtypes, identifying context-dependent tumor suppressor activity mediated through STAT3 pathway activation.","method":"Ectopic NFIB expression in patient-derived GBM cells; tumourigenesis assays; Western blot for phospho-STAT3","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function in patient-derived cells with defined signaling readout, single lab","pmids":["27083054"],"is_preprint":false},{"year":2024,"finding":"Conditional genetic knockout of Nfib in SCLC genetically engineered mouse models demonstrates that while Nfib upregulation contributes to tumor progression, Nfib is not required for metastasis; FOXA1/2 are identified as candidate drivers of Nfib-independent metastatic progression, highlighting SCLC plasticity.","method":"Conditional Nfib knockout in SCLC GEMM; molecular profiling identifying FOXA1/2 upregulation in NFIB-KO tumors","journal":"Cancer Research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO in physiologically relevant in vivo GEMM with defined metastasis phenotype; negative result (NFIB not required for metastasis) established rigorously","pmids":["37963187"],"is_preprint":false}],"current_model":"NFIB is a site-specific transcription factor (binding the TGGCA/NFI motif) that regulates chromatin accessibility—acting as a pioneer factor to open nucleosomes and facilitate replication licensing via the pre-RC—and transcriptionally activates or represses target genes (including Ezh2, CDKN1A/p21, ERO1A, NDUFA4L2, PINK1, RIP2, CYP2D6, Nfix, and ITGA6) depending on cellular context; its activity is potentiated by CARM1-mediated methylation (read by TRIM29), and it forms heterodimers with other NFI family members as well as co-occupancy complexes with STAT5 and AR/FOXA1, while being subject to post-translational regulation via m6A-dependent mRNA stabilization (YTHDF2) and protein stability control (TRIM8 ubiquitin ligase)."},"narrative":{"mechanistic_narrative":"NFIB is a site-specific transcription factor of the NFI family that binds the TGGCA/NFI motif in vivo and controls cell-fate decisions during development and oncogenesis by reprogramming chromatin accessibility and gene transcription [PMID:2339052, PMID:24661679, PMID:27374332]. Mechanistically, NFIB functions as a pioneer-type factor: it physically associates with the pre-replication complex, binds and opens nucleosomes, promotes nucleosome eviction on parental chromatin, and is necessary and sufficient to open distal regulatory elements, linking its DNA-binding activity to both replication-origin licensing and metastatic enhancer programs [PMID:37604829, PMID:27374332]. Its transcriptional output is bidirectional and context-dependent: it represses targets such as Ezh2, CDKN1A/p21, and Edn2 [PMID:24553933, PMID:30350349, PMID:23389444] and activates targets such as Nfix, ITGA6, ERO1A, NDUFA4L2, PINK1, and RIP2 [PMID:29106906, PMID:31754405, PMID:33751828, PMID:36369883, PMID:33981484, PMID:35409172], operating combinatorially at composite elements co-occupied with STAT5, the androgen receptor/FOXA1, and the glucocorticoid receptor [PMID:24678731, PMID:26677878, PMID:24661679]. NFIB activity is potentiated by CARM1-mediated methylation read by the effector TRIM29, which maintains open chromatin and drives SCLC onset [PMID:36690626], and is post-translationally tuned by m6A/YTHDF2-dependent mRNA stabilization and TRIM8-mediated protein-stability control [PMID:38536119]. Developmentally, NFIB is required in a gene-dosage-sensitive manner for late fetal lung maturation, forebrain and corpus-callosum formation, precerebellar pontine development, and gliogenesis [PMID:15632069, PMID:19961580, PMID:19107796], and human haploinsufficiency causes intellectual disability with macrocephaly [PMID:30388402].","teleology":[{"year":1990,"claim":"Established that NFIB is a distinct member of a multigene NFI family of site-specific transcription factors sharing TGGCA-binding specificity, framing the question of how functional diversity arises among near-identical DNA binders.","evidence":"Peptide microsequencing and cDNA cloning with cross-species sequence alignment","pmids":["2339052"],"confidence":"Medium","gaps":["No direct functional reconstitution of NFIB DNA binding","Does not explain target selectivity distinguishing NFIB from paralogs"]},{"year":1997,"claim":"Showed that alternative RNA processing generates a truncated NFI-B3 isoform that heterodimerizes with other NFI members to act as a dominant-negative repressor, revealing that NFI output is tuned by isoform-driven heterodimerization.","evidence":"Alternative RNA processing characterization, reporter assays in SL-2 cells, and EMSA of heterodimer DNA binding","pmids":["9099724"],"confidence":"High","gaps":["Endogenous abundance and physiological role of NFI-B3 not established","Does not address full-length NFIB target gene control"]},{"year":2002,"claim":"Demonstrated an in vivo developmental requirement: NFIB is needed for late lung maturation, with mutants failing to down-regulate TGF-β1 and Shh, implicating NFIB as a repressive gate on these signals.","evidence":"Nfib knockout mouse with histology and in situ expression analysis","pmids":["11850179"],"confidence":"Medium","gaps":["Direct vs indirect repression of TGF-β1/Shh not resolved","No genome-wide binding data in this study"]},{"year":2005,"claim":"Defined the multi-organ, dosage-sensitive developmental role of NFIB across lung and forebrain, establishing haploinsufficiency as a physiologically relevant mode of action.","evidence":"Nfib knockout mouse with histology, immunohistochemistry, neuroanatomical analysis of homozygous and heterozygous animals","pmids":["15632069"],"confidence":"High","gaps":["Molecular targets underlying each organ phenotype not identified here","Cell-autonomy not dissected"]},{"year":2009,"claim":"Resolved cellular mechanisms of NFIB-dependent brain development, showing non-cell-autonomous control of midline glial differentiation and pontine neuron production, and establishing functional specificity of NFIB relative to NFIA/NFIX.","evidence":"Nfib, Nfia, Nfix knockout mice with retrograde tracing, IHC, proliferation/apoptosis and migration analyses","pmids":["19961580","19107796"],"confidence":"High","gaps":["Direct transcriptional targets driving glial/neuronal phenotypes not defined","Basis of NFIB-specific function among paralogs unexplained"]},{"year":2013,"claim":"Provided the first direct genomic target via ChIP-seq, showing NFIB represses Edn2 in hair follicle stem cells to restrain melanocyte stem cell differentiation, with pharmacological rescue confirming the pathway.","evidence":"HFSC-specific conditional KO, ChIP-seq, transcriptional profiling, and endothelin/KIT pharmacological rescue","pmids":["23389444"],"confidence":"High","gaps":["Cofactors mediating Edn2 repression not identified","Generalizability of repression mode to other tissues not tested"]},{"year":2014,"claim":"Defined NFIB's combinatorial chromatin logic by mapping in vivo motif binding, activator-biased promoter occupancy with the glucocorticoid receptor, and direct co-occupancy with STAT5 at mammary enhancers, plus direct repression of Ezh2 in cortex.","evidence":"ChIP-seq for NFIB/STAT5 in mammary tissue, NFIB lung ChIP-seq with Nr3c1 integration, and ChIP plus reporter assays for Ezh2 in KO mice","pmids":["24661679","24678731","24553933"],"confidence":"High","gaps":["Determinants of activator vs repressor outcome at a given site unclear","Direct physical contact with GR not demonstrated"]},{"year":2015,"claim":"Extended NFIB co-regulation to AR/FOXA1 networks and to viral transcription, positioning NFIB as a context-dependent modulator of androgen signaling and a repressor at the HIV-1 LTR.","evidence":"ChIP-seq in LNCaP, NFIB knockdown, prostate KO engraftment; and ChIP plus knockdown at the HIV-1 LTR in T-cell lines","pmids":["26677878","25664610"],"confidence":"Medium","gaps":["Mechanism of AR co-occupancy (direct binding vs tethering) not resolved","HIV-1 LTR repression mechanism not detailed"]},{"year":2016,"claim":"Established NFIB as a chromatin-accessibility driver in SCLC metastasis, showing copy-number amplification opens distal elements and that NFIB is necessary and sufficient to increase accessibility and pro-metastatic neuronal programs.","evidence":"SCLC GEMMs with ATAC-seq, genome-wide binding analysis, and gain/loss-of-function in cell lines","pmids":["27374332","27373156"],"confidence":"High","gaps":["Biophysical basis of NFIB-driven accessibility not yet shown","Cofactors required for pro-metastatic program incompletely defined"]},{"year":2016,"claim":"Placed NFIB in post-transcriptional lineage-restriction circuits and revealed tissue-dependent tumor-suppressive output, broadening its functional repertoire beyond a single activity.","evidence":"Conditional Drosha deletion with NFIB knockdown rescue in adult NSCs; ectopic NFIB in patient-derived GBM cells with phospho-STAT3 readout","pmids":["27545503","27083054"],"confidence":"Medium","gaps":["How NFIB toggles between oncogenic and tumor-suppressive roles unresolved","Direct NFIB targets in GBM/STAT3 axis not mapped"]},{"year":2017,"claim":"Built the NFI auto-regulatory and protein-interaction architecture, showing NFIB activates Nfix, heterodimerizes additively with NFIA in cortex, and represses ESR1 transactivation in complex with YBX1/FOXA1; in melanoma NFIB drives invasion via an EZH2→MITF axis.","evidence":"Nfia/Nfib KO mice with Nfix promoter reporters, compound KO and co-IP, ESR1/FOXA1 co-IP with reporter assays, and melanoma knockdown/overexpression invasion assays","pmids":["29106906","32166136","29180470","28119061"],"confidence":"Medium","gaps":["Stoichiometry and DNA-binding consequences of NFIA/NFIB heterodimers in vivo unclear","Whether ESR1 repression requires NFIB DNA binding not established"]},{"year":2018,"claim":"Confirmed disease causation and direct cell-cycle control, linking human NFIB haploinsufficiency to intellectual disability with macrocephaly and demonstrating direct repression of CDKN1A/p21 governing apoptosis and chemosensitivity.","evidence":"Human variant cohort with reporter assays and cortex-specific KO mouse MRI; ChIP at CDKN1A with siRNA and double-knockdown epistasis plus drug-sensitivity assays","pmids":["30388402","30350349"],"confidence":"High","gaps":["Full target set explaining macrocephaly not enumerated","Context dictating p21 repression vs activation unknown"]},{"year":2019,"claim":"Expanded the direct-activator target catalog into cancer metastasis programs by identifying ITGA6 as a directly bound NFIB target mediating colorectal metastasis.","evidence":"ChIP, luciferase reporter, and NFIB knockdown functional assays in CRC cells","pmids":["31754405"],"confidence":"Medium","gaps":["Cofactors at the ITGA6 promoter not identified","In vivo requirement not tested in this study"]},{"year":2020,"claim":"Revealed how NFIB is co-opted oncogenically through enhancer hijacking and identified KDM4D/MLL1 as a chromatin-modifying interaction module enabling NFIB-dependent gene activation.","evidence":"RNA-seq/RT-PCR fusion mapping with super-enhancer analysis in pleomorphic adenoma; co-IP and ChIP of KDM4D with NFIB/MLL1 in adipogenesis with rescue","pmids":["32654217","32080306"],"confidence":"Medium","gaps":["Whether NFIB recruits or follows MLL1 at native loci unresolved","Direct vs indirect role of NFIB protein in fusion-driven activation not separated"]},{"year":2021,"claim":"Mapped multiple direct metastasis- and stress-relevant targets (ERO1A, PINK1, CDH1/VIM, RIP2) and uncovered RNA-level (m6A/YTHDF2) and protein-level (TRIM8) regulation of NFIB itself, plus a sufficiency for astrocyte differentiation requiring MAPK.","evidence":"In vivo piggyBac NFIB overexpression with ERO1A promoter assays; ChIP at CDH1/VIM with m6A-seq, YTHDF2 RIP and TRIM8 co-IP; PINK1 and RIP2 ChIP/reporter assays; NFIB overexpression in hPSC-NPCs with MAPK inhibition","pmids":["33751828","38536119","33981484","35409172","33949692"],"confidence":"High","gaps":["Site of CARM1 methylation relative to these regulatory layers not yet connected here","Tissue specificity of each target circuit not cross-validated"]},{"year":2022,"claim":"Connected NFIB to drug metabolism and therapy resistance, showing repression of CYP2D6 (with a pharmacogenomic variant correlate) and activation of NDUFA4L2 to limit ROS and confer sorafenib resistance.","evidence":"NFIB overexpression in Huh7/liver spheroids with patient genotyping; ChIP at NDUFA4L2 with ROS measurement and in vivo tumor assay","pmids":["35253216","36369883"],"confidence":"Medium","gaps":["Cofactors switching NFIB between CYP2D6 repression and NDUFA4L2 activation unknown","Direct binding at CYP2D6 not shown in this study"]},{"year":2023,"claim":"Provided mechanistic, biophysical understanding: NFIB is a pioneer factor that opens nucleosomes and partners with the pre-RC to license replication origins, and its chromatin-opening oncogenic activity is gated by CARM1 methylation read by TRIM29.","evidence":"Co-IP with pre-RC, ATAC-seq, nucleosome binding assays, single-molecule magnetic tweezers, TEM and Hi-C; plus CARM1 methylation/TRIM29 pulldown with SCLC GEMM and ATAC-seq, and a NAD+/NAMPT metabolic axis in CRC","pmids":["37604829","36690626","37491379"],"confidence":"High","gaps":["How replication-licensing role integrates with transcriptional targeting unresolved","Structure of NFIB-nucleosome and NFIB-pre-RC complexes undetermined"]},{"year":2024,"claim":"Refined the oncogenic model by genetic dissection, showing NFIB contributes to but is dispensable for SCLC metastasis, with FOXA1/2 as candidate compensatory drivers, underscoring tumor plasticity.","evidence":"Conditional Nfib knockout in SCLC GEMM with molecular profiling","pmids":["37963187"],"confidence":"High","gaps":["Mechanism of FOXA1/2 compensation not defined","Reconciliation with earlier necessity/sufficiency claims incomplete"]},{"year":null,"claim":"It remains unresolved how a single TGGCA-binding factor selects activating versus repressing outcomes at different loci and how its pioneer/replication-licensing function is mechanistically coupled to context-specific transcriptional programs.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of NFIB on nucleosomes or with the pre-RC","Rules governing cofactor selection (STAT5 vs AR/FOXA1 vs GR vs MLL1) not defined","Determinants of activator vs repressor behavior at a given promoter unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,7,17,19,33,25]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[33,26,7,17]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[26]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[23,26,7]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[26]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[33,7,17,25]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[10,26,25]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,4,5,14]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[10,11,18,35]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[26]}],"complexes":["pre-replication complex (associated)","MLL1 complex (associated)"],"partners":["STAT5","AR","FOXA1","ESR1","YBX1","KDM4D","CARM1","TRIM29"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O00712","full_name":"Nuclear factor 1 B-type","aliases":["CCAAT-box-binding transcription factor","CTF","Nuclear factor I/B","NF-I/B","NFI-B","TGGCA-binding protein"],"length_aa":420,"mass_kda":47.4,"function":"Transcriptional activator of GFAP, essential for proper brain development (PubMed:30388402). Recognizes and binds the palindromic sequence 5'-TTGGCNNNNNGCCAA-3' present in viral and cellular promoters and in the origin of replication of adenovirus type 2. These proteins are individually capable of activating transcription and replication","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/O00712/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NFIB","classification":"Not Classified","n_dependent_lines":22,"n_total_lines":1208,"dependency_fraction":0.018211920529801324},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NFIB","total_profiled":1310},"omim":[{"mim_id":"618286","title":"MACROCEPHALY, ACQUIRED, WITH IMPAIRED INTELLECTUAL DEVELOPMENT; MACID","url":"https://www.omim.org/entry/618286"},{"mim_id":"600729","title":"NUCLEAR FACTOR I/C; NFIC","url":"https://www.omim.org/entry/600729"},{"mim_id":"600728","title":"NUCLEAR FACTOR I/B; NFIB","url":"https://www.omim.org/entry/600728"},{"mim_id":"600727","title":"NUCLEAR FACTOR I/A; NFIA","url":"https://www.omim.org/entry/600727"},{"mim_id":"164005","title":"NUCLEAR FACTOR I/X; NFIX","url":"https://www.omim.org/entry/164005"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli fibrillar center","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NFIB"},"hgnc":{"alias_symbol":["NFI-RED","NFIB2","NFIB3"],"prev_symbol":[]},"alphafold":{"accession":"O00712","domains":[{"cath_id":"3.90.520.10","chopping":"6-172","consensus_level":"high","plddt":93.5719,"start":6,"end":172}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00712","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00712-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00712-F1-predicted_aligned_error_v6.png","plddt_mean":67.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NFIB","jax_strain_url":"https://www.jax.org/strain/search?query=NFIB"},"sequence":{"accession":"O00712","fasta_url":"https://rest.uniprot.org/uniprotkb/O00712.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00712/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00712"}},"corpus_meta":[{"pmid":"19841262","id":"PMC_19841262","title":"Recurrent fusion of 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intron-internal polyadenylation signal, lacks independent DNA-binding and transcriptional activity but forms heterodimers with other NFI family members (NFI-B, -C, -X), reducing their DNA-binding activity and thereby repressing their transcriptional activation in a dominant-negative manner.\",\n      \"method\": \"Alternative RNA processing characterization, SL-2 cell transfection reporter assays, gel-shift (EMSA) analysis of heterodimer DNA binding\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro functional assays (transcription reporter + EMSA), mutagenesis-level mechanistic dissection, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"9099724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"NFIB (NFI-B) is one of at least three independent NFI gene family members encoding site-specific transcription factors with identical DNA-binding specificity (TGGCA motif); functional diversity is generated through differential RNA splicing from each gene.\",\n      \"method\": \"Peptide microsequencing, PCR-supported cDNA cloning, sequence alignment across species\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical cloning and sequencing with cross-species validation, but no direct functional reconstitution of DNA binding for NFIB specifically\",\n      \"pmids\": [\"2339052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Nfib is essential for late fetal lung maturation and forebrain development; Nfib-deficient mice die perinatally with severe lung hypoplasia, agenesis of the corpus callosum, basilar pons formation defects, and hippocampal developmental defects. Heterozygous animals exhibit haploinsufficiency (callosal agenesis and delayed lung maturation), indicating a gene dosage requirement.\",\n      \"method\": \"Nfib knockout mouse model; histology, immunohistochemistry, neuroanatomical analysis\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined multi-organ phenotypic readouts, replicated across heterozygous and homozygous animals\",\n      \"pmids\": [\"15632069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Nfib null mutants display severe lung hypoplasia and die early postnatally; TGF-β1 and Sonic hedgehog (Shh) expression are not down-regulated in mutant lung epithelium at late morphogenesis stages, suggesting NFIB normally represses these signals to permit lung maturation.\",\n      \"method\": \"Nfib knockout mouse model; histology, in situ hybridization / expression analysis of TGF-β1 and Shh\",\n      \"journal\": \"Mechanisms of Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO model with defined lung phenotype and candidate pathway identification, single lab\",\n      \"pmids\": [\"11850179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In Nfib-deficient mice, corpus callosum agenesis arises through non-cell-autonomous mechanisms: midline radial progenitors fail to differentiate into mature glia (without abnormal proliferation or apoptosis), and cingulate neurons show reduced neuropilin-1 expression causing failure of pioneer axons to cross the midline.\",\n      \"method\": \"Nfib knockout mouse; retrograde tracer labeling, immunohistochemistry, cell proliferation and apoptosis assays\",\n      \"journal\": \"Neural Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (tracer labeling, IHC, proliferation/apoptosis assays) in KO model establishing mechanism\",\n      \"pmids\": [\"19961580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NFI-B expression is specifically restricted to mossy fiber populations of the precerebellar system; in Nfib(-/-) mice, basilar pontine nuclei development is delayed with fewer pontine neurons produced and slower migration, while Nfia and Nfix null mice show no pontine phenotype—demonstrating functional specificity of NFIB among NFI family members.\",\n      \"method\": \"Immunohistochemistry in Nfib, Nfia, and Nfix knockout mice; neuronal migration analysis\",\n      \"journal\": \"The Journal of Comparative Neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple KO models compared, clean cell-type-specific phenotype, genetic specificity established by cross-comparison\",\n      \"pmids\": [\"19107796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NFIB in hair follicle stem cells (HFSCs) suppresses melanocyte stem cell (McSC) proliferation and differentiation by repressing endothelin 2 (Edn2) transcription; conditional deletion of Nfib in HFSCs leads to ectopic Edn2 upregulation, which promotes McSC differentiation. KIT-ligand from dermal papilla is identified as an additional signal, and endothelin receptor antagonists or KIT-blocking antibodies prevent precocious McSC differentiation in NFIB-deficient mice.\",\n      \"method\": \"HFSC-specific Nfib conditional knockout mouse; ChIP-seq, transcriptional profiling, pharmacological rescue with endothelin receptor antagonists and KIT antibodies\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — conditional KO with defined phenotype, ChIP-seq identifying direct target (Edn2), pharmacological rescue; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"23389444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NFIB directly binds the Ezh2 promoter and represses Ezh2 transcription; loss of Nfib in mice results in increased EZH2 expression in the neocortex and hippocampus, increased proliferating ventricular zone progenitors expressing progenitor markers, and misregulation of downstream EZH2 epigenetic targets—demonstrating NFIB as a transcriptional repressor of Ezh2 during cortical development.\",\n      \"method\": \"Nfib knockout mouse; ChIP assay showing NFIB binding to Ezh2 promoter; NFIB overexpression reporter assay; immunohistochemistry for EZH2 and progenitor markers\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP + overexpression reporter + KO phenotype, multiple orthogonal methods establishing direct transcriptional repression\",\n      \"pmids\": [\"24553933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NFIB co-occupies genomic binding sites with STAT5 and androgen-receptor/FOXA1 at composite regulatory elements marked by enhancer histone modifications; NFIB loss combined with STAT5 loss prevents formation of functional mammary alveoli, and ChIP-seq demonstrates NFIB-STAT5 co-binding at a shared set of mammary-specific gene regulatory elements.\",\n      \"method\": \"Mammary-specific Nfib conditional knockout mouse; ChIP-seq for NFIB and STAT5; gene expression analysis; integration with published HFSC ChIP-seq datasets\",\n      \"journal\": \"Molecular Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — conditional KO with defined phenotype, ChIP-seq showing direct co-occupancy, genetic epistasis between NFIB and STAT5\",\n      \"pmids\": [\"24678731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NFIB binding sites in LNCaP prostate cancer cells overlap with 64.3% of AR and FOXA1 binding sites by ChIP-seq; NFIB knockdown increases AR expression and superinduces a subset of AR target genes; loss of Nfib in mouse prostate (rescued via renal capsule engraftment) causes prostatic hyperplasia that does not resolve after castration, identifying NFIB as a co-regulator of AR signaling.\",\n      \"method\": \"ChIP-seq in LNCaP cells; NFIB siRNA knockdown; mouse Nfib knockout tissue engraftment under renal capsule; immunohistochemistry\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP-seq + genetic KO + functional rescue model, multiple orthogonal methods\",\n      \"pmids\": [\"26677878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Nfib copy number amplification in SCLC metastases correlates with widespread opening of distal chromatin regulatory elements enriched for NFIB binding sites; Nfib is necessary and sufficient to increase chromatin accessibility at intergenic regions and drives pro-metastatic neuronal gene expression programs in SCLC cells.\",\n      \"method\": \"Genetically engineered mouse model of SCLC; ATAC-seq for chromatin accessibility; genome-wide NFIB binding site analysis; Nfib overexpression and knockdown in SCLC cell lines\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genome-wide chromatin accessibility (ATAC-seq) + genetic gain/loss-of-function + copy number analysis; replicated across mouse model and human data\",\n      \"pmids\": [\"27374332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NFIB overexpression in Rb1/Trp53-deleted SCLC mouse models specifically promotes metastatic spread and expansion of an E-cadherin-negative invasive cell population, while both NFIB and MYCL overexpression accelerate tumor growth; suppression of Nfib in cell lines increases apoptosis and inhibits proliferation; transcriptional analysis shows Nfib regulates axon guidance, focal adhesion, and extracellular matrix receptor interaction genes.\",\n      \"method\": \"Rb1/p53-deficient SCLC mouse model with doxycycline-inducible Nfib overexpression; Nfib knockdown in SCLC cell lines; transcriptional profiling\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse model gain-of-function + cell line loss-of-function + transcriptional profiling; replicated findings across two independent SCLC models\",\n      \"pmids\": [\"27373156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Drosha directly targets NFIB mRNA to repress its expression independently of Dicer and microRNAs in adult hippocampal NSCs; deletion of Drosha activates NFIB expression, which in turn activates oligodendrogenesis at the expense of neurogenesis; NFIB knockdown in Drosha-deficient NSCs restores neurogenesis, placing NFIB downstream of Drosha as the key effector of lineage restriction.\",\n      \"method\": \"Conditional Drosha deletion in adult dentate gyrus NSCs; NFIB knockdown rescue experiments; Dicer-independent mechanism confirmed by genetic controls\",\n      \"journal\": \"Cell Stem Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO + genetic rescue epistasis in vivo, Dicer-independence established, clean cell fate phenotype\",\n      \"pmids\": [\"27545503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NFIB acts downstream of BRN2 in melanoma cells to promote invasion; NFIB upregulates EZH2, which epigenetically represses MITF, thereby driving an invasive, less-proliferative melanoma phenotype. NFIB knockdown reduces migration and invasion, and EZH2 knockdown phenocopies NFIB loss.\",\n      \"method\": \"NFIB and EZH2 knockdown/overexpression in melanoma cells; migration and invasion assays; Western blot for MITF and EZH2\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain/loss-of-function with mechanistic follow-up (EZH2→MITF axis), single lab, multiple cell phenotype readouts\",\n      \"pmids\": [\"28119061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NFIB transcriptionally activates Nfix expression in the spinal cord; in the absence of Nfia or Nfib, NFIX expression is markedly reduced, and in vitro NFIB overexpression drives Nfix promoter activity, establishing a hierarchical auto-regulatory cascade: NFIB → NFIX in spinal cord gliogenesis.\",\n      \"method\": \"Nfia and Nfib knockout mice; in vitro Nfix promoter reporter assay with NFIB overexpression; immunohistochemistry\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO phenotype plus in vitro reporter assay confirming direct transcriptional activation, single lab\",\n      \"pmids\": [\"29106906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NFIB and YBX1 physically interact with the ESR1-FOXA1 complex and inhibit ESR1 transactivational potential; FGFR2 signaling augments these interactions and further represses ESR1 target gene expression.\",\n      \"method\": \"Co-immunoprecipitation of NFIB and YBX1 with ESR1/FOXA1; ESR1 transcriptional reporter assays; FGFR2 signaling modulation\",\n      \"journal\": \"Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying novel protein-protein interaction + functional reporter assay, single lab\",\n      \"pmids\": [\"29180470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NFIA and NFIB are co-expressed in the developing cerebral cortex, can form heterodimers in vivo (detected by co-immunoprecipitation), and function additively: compound heterozygous loss of both genes causes a cortical phenotype similar to single homozygous knockouts, while double homozygous loss causes a more severe phenotype with greater ventricular enlargement and fewer differentiated glia and neurons.\",\n      \"method\": \"Compound Nfia/Nfib knockout mouse models; co-immunoprecipitation; immunofluorescence; gene expression analysis; MRI\",\n      \"journal\": \"Brain and Neuroscience Advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishing in vivo heterodimerization + graded genetic KO phenotype, single lab\",\n      \"pmids\": [\"32166136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NFIB directly binds the CDKN1A (p21) promoter in TP53-mutated TNBC cells and suppresses p21 transcription; NFIB depletion induces CDKN1A expression, cell cycle arrest, apoptosis, and enhanced docetaxel sensitivity; combined knockdown of p21 and NFIB reverses the drug-sensitization, placing NFIB's effect upstream of p21.\",\n      \"method\": \"ChIP assay showing NFIB occupancy at CDKN1A promoter; siRNA knockdown; combined NFIB/p21 knockdown rescue; cell death and drug sensitivity assays\",\n      \"journal\": \"The Journal of Pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP demonstrating direct promoter binding + genetic epistasis (double KD rescue) + multiple functional readouts\",\n      \"pmids\": [\"30350349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NFIB haploinsufficiency in humans (point mutations creating premature stop codons or single-nucleotide variants) causes intellectual disability with macrocephaly; in vitro reporter assays confirm loss of transcriptional activity of variant proteins. Cortex-specific Nfib conditional knockout mice exhibit enlarged cerebral cortex, confirming macrocephaly as a functional consequence of NFIB loss.\",\n      \"method\": \"Human genetic cohort with NFIB variants; in vitro transcriptional reporter assay for variant NFIB proteins; Nfib cortex-specific conditional KO mouse; MRI and histology\",\n      \"journal\": \"American Journal of Human Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro functional assay of human variants + mouse KO model with MRI-validated macrocephaly, multiple orthogonal methods\",\n      \"pmids\": [\"30388402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NFIB promotes ITGA6 transcription in colorectal cancer cells; ChIP assay demonstrates NFIB occupancy at the ITGA6 promoter, and this transcriptional activation mediates the metastasis-promoting effect of NFIB.\",\n      \"method\": \"ChIP assay for NFIB binding to ITGA6 promoter; luciferase reporter and NFIB knockdown functional assays in CRC cells\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional knockdown, single lab, one direct target validated\",\n      \"pmids\": [\"31754405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NFIB activates PLAG1 and HMGA2 in pleomorphic adenoma via promoter-swapping gene fusions (NFIB-PLAG1 and HMGA2-NFIB chimeric transcripts); super-enhancers in the NFIB locus are translocated upstream of PLAG1 or downstream of HMGA2, constituting an enhancer-hijacking mechanism.\",\n      \"method\": \"RNA-seq and RT-PCR identification of fusion transcripts; chromatin landscape analysis (super-enhancer mapping) around NFIB locus\",\n      \"journal\": \"Genes, Chromosomes & Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-seq fusion characterization + super-enhancer mapping, mechanistic model inferred from genomic data, single lab\",\n      \"pmids\": [\"32654217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"KDM4D histone demethylase physically interacts with NFIB and the MLL1 complex; KDM4D demethylates H3K9me3, which is required for NFIB and MLL1 to deposit H3K4me3 and activate PPARγ and C/EBPα transcription during adipogenesis. NFIB and MLL1 complex bind target promoters independently of KDM4D.\",\n      \"method\": \"Co-immunoprecipitation of KDM4D with NFIB and MLL1; ChIP for H3K9me3, H3K4me3, NFIB, and MLL1 at target promoters; rescue experiments in KDM4D-depleted cells\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — Co-IP + ChIP establishing physical and functional interaction + mechanistic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"32080306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NFIB directly increases expression of ERO1A, which enhances HIF1α-VEGFA-mediated angiogenesis and lung metastatic colonization of breast cancer; overexpression of NFIB alone (via piggyBac transposon) is sufficient to enhance primary mammary tumor growth and lung metastasis.\",\n      \"method\": \"Inducible piggyBac transposon screen; NFIB overexpression in mammary tumor model; ChIP or promoter assays for ERO1A; in vivo lung colonization assays\",\n      \"journal\": \"EMBO Molecular Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function in vivo + mechanistic pathway identification (NFIB→ERO1A→HIF1α-VEGFA), single lab\",\n      \"pmids\": [\"33751828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NFIB regulates CYP2D6 gene expression in the liver; NFIB inhibits CYP2D6 transcription in Huh7 cells and 3D liver spheroids; carriers of NFIB rs28379954 T>C allele have reduced nuclear NFIB expression and elevated CYP2D6-dependent risperidone hydroxylation in vivo.\",\n      \"method\": \"NFIB overexpression in Huh7 cells and 3D liver spheroids; genotyping of 604 risperidone-treated patients for CYP2D6 and NFIB; translational pharmacogenomic study\",\n      \"journal\": \"Clinical Pharmacology and Therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro functional assay plus in vivo pharmacogenomic confirmation, two orthogonal methods, single research group\",\n      \"pmids\": [\"35253216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NFIB directly binds the NDUFA4L2 promoter and promotes its transcription, thereby reducing sorafenib-induced reactive oxygen species accumulation and promoting sorafenib resistance in hepatocellular carcinoma.\",\n      \"method\": \"ChIP assay confirming NFIB binding to NDUFA4L2 promoter; gene expression profiling; NFIB knockdown with ROS measurement; in vivo tumor growth assay\",\n      \"journal\": \"Cancer Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional knockdown and ROS measurement, single lab\",\n      \"pmids\": [\"36369883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CARM1 methylates NFIB and acts as its coactivator; TRIM29 is an effector molecule that reads methylated NFIB. Both CARM1 and the CARM1 methylation site on NFIB are required for rapid SCLC onset in a mouse model, and CARM1/methylated-NFIB maintain open chromatin states in tumors.\",\n      \"method\": \"Biochemical substrate identification of NFIB as CARM1 substrate; TRIM29 pulldown as effector of methylated NFIB; SCLC mouse model with CARM1 KO and NFIB methylation-site mutant; ATAC-seq for chromatin accessibility\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical methylation assay + effector pulldown + in vivo mouse model + chromatin profiling, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"36690626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NFIB physically associates with the pre-replication complex (pre-RC) in mammalian cells, increases chromatin accessibility at replication origins by binding and opening nucleosomes (shown by nucleosome binding assay and single-molecule magnetic tweezers), and promotes nucleosome eviction on parental chromatin (TEM). NFIB deficiency alters chromosome contacts/compartments in G1 and S phase and impairs firing of a subset of early-replication origins. Cancer-associated NFIB overexpression provokes gene duplication and genomic alterations.\",\n      \"method\": \"Co-immunoprecipitation of NFIB with pre-RC components; ATAC-seq; nucleosome binding assay; single-molecule magnetic tweezers; transmission electron microscopy; Hi-C for chromosome contacts\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution-level biochemistry (nucleosome binding, single-molecule tweezers, TEM) plus genome-wide chromatin/replication profiling, multiple orthogonal methods\",\n      \"pmids\": [\"37604829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NFIB directly binds to gene promoters of CDH1 (E-cadherin) and VIM (vimentin) and regulates their transcription independently of canonical EMT transcription factors; elevated m6A modification of NFIB mRNA in AR-negative CRPC recruits YTHDF2 to increase NFIB mRNA stability, while reduced TRIM8 (due to m6A modification of its own mRNA) further stabilizes NFIB protein, collectively promoting EMT and metastasis.\",\n      \"method\": \"ChIP assay for NFIB binding to CDH1 and VIM promoters; m6A-seq and YTHDF2 RIP; TRIM8 co-immunoprecipitation; NFIB knockdown migration assays; in vivo metastasis model\",\n      \"journal\": \"Cancer Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP for direct promoter binding + m6A/YTHDF2 mechanism + TRIM8 interaction + in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"38536119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HIV-1 infection induces NFIB expression, and NFIB associates with the HIV-1 LTR region (−386 to −453 nt) as shown by ChIP assay; this association negatively correlates with HIV-1 transcription, and NFIB knockdown increases HIV-1 replication, indicating NFIB functions as a repressor of HIV-1 transcription.\",\n      \"method\": \"ChIP assay for NFIB binding to HIV-1 LTR; NFIB knockdown in T-cell lines (J1.1, J-Lat-Tat-GFP); viral replication quantification\",\n      \"journal\": \"Viruses\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional knockdown in two cell models, single lab\",\n      \"pmids\": [\"25664610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Overexpression of NFIB in human pluripotent stem cell-derived neural precursor cells is sufficient to rapidly induce astrocyte differentiation in 2 weeks; MAPK pathway activity is necessary for this NFIB-driven astrogliogenesis.\",\n      \"method\": \"NFIB overexpression in hPSC-derived NPCs; RNA-seq transcriptomics; MAPK pathway inhibitor experiments; functional astrocyte assays\",\n      \"journal\": \"Journal of Cellular Physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function in human cells + pathway inhibitor + transcriptomic validation, single lab\",\n      \"pmids\": [\"33949692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NFIB promotes colorectal cancer cell proliferation by inhibiting miR-182-5p, which normally targets and suppresses NAMPT (the NAD+ salvage synthesis rate-limiting enzyme); thus NFIB maintains NAD+ levels to sustain proliferation, and NMN supplementation rescues proliferation in NFIB-knockdown cells.\",\n      \"method\": \"NFIB knockdown with NAD+ measurement; miR-182-5p reporter assays; NMN rescue experiment; in vivo tumor growth assay\",\n      \"journal\": \"Communications Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function + metabolic rescue + reporter assay, single lab, pathway placement established\",\n      \"pmids\": [\"37491379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NFIB directly binds to the PINK1 promoter and regulates PINK1 transcription in kidney renal clear cell carcinoma (KIRC), promoting tumor progression and metastasis; ChIP experiments confirm NFIB occupancy at the PINK1 promoter.\",\n      \"method\": \"ChIP assay for NFIB binding to PINK1 promoter; NFIB knockdown proliferation and migration assays; in vivo tumor progression experiments\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional knockdown, single lab, one direct target validated\",\n      \"pmids\": [\"33981484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NFIB transcriptionally activates RIP2 gene expression by binding to its core promoter region (−2300 to −1839 bp), as confirmed by dual-luciferase reporter assay and ChIP-PCR; NFIB overexpression exacerbates APEC-induced apoptosis and inflammation via RIP2-mediated NF-κB signaling.\",\n      \"method\": \"Dual-luciferase reporter assay; ChIP-PCR for NFIB binding to RIP2 promoter; NFIB overexpression and RIP2 knockdown in chicken HD11 cells\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-PCR + reporter assay + genetic epistasis via RIP2 knockdown rescue, single lab\",\n      \"pmids\": [\"35409172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ChIP-seq of NFIB in mouse lung at E16.5 confirms that NFIB binds in vivo to the same NFI motif identified in vitro; NFIB binding is over-represented in promoters of genes under-expressed in Nfib-KO mice, indicating an activator role; NFIB and glucocorticoid receptor (Nr3c1) co-regulate an overlapping set of 52 genes (~13x greater than chance) during lung maturation.\",\n      \"method\": \"ChIP-seq for NFIB in mouse lung; motif analysis; integration with Nr3c1-KO microarray data\",\n      \"journal\": \"BMC Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq in vivo establishing DNA-binding specificity + computational cross-comparison with KO datasets, single lab\",\n      \"pmids\": [\"24661679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NFIB expression in patient-derived GBM cells (classical and mesenchymal subtypes) activates phospho-STAT3 signaling; ectopic NFIB expression inhibits tumourigenesis in these subtypes, identifying context-dependent tumor suppressor activity mediated through STAT3 pathway activation.\",\n      \"method\": \"Ectopic NFIB expression in patient-derived GBM cells; tumourigenesis assays; Western blot for phospho-STAT3\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function in patient-derived cells with defined signaling readout, single lab\",\n      \"pmids\": [\"27083054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Conditional genetic knockout of Nfib in SCLC genetically engineered mouse models demonstrates that while Nfib upregulation contributes to tumor progression, Nfib is not required for metastasis; FOXA1/2 are identified as candidate drivers of Nfib-independent metastatic progression, highlighting SCLC plasticity.\",\n      \"method\": \"Conditional Nfib knockout in SCLC GEMM; molecular profiling identifying FOXA1/2 upregulation in NFIB-KO tumors\",\n      \"journal\": \"Cancer Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO in physiologically relevant in vivo GEMM with defined metastasis phenotype; negative result (NFIB not required for metastasis) established rigorously\",\n      \"pmids\": [\"37963187\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NFIB is a site-specific transcription factor (binding the TGGCA/NFI motif) that regulates chromatin accessibility—acting as a pioneer factor to open nucleosomes and facilitate replication licensing via the pre-RC—and transcriptionally activates or represses target genes (including Ezh2, CDKN1A/p21, ERO1A, NDUFA4L2, PINK1, RIP2, CYP2D6, Nfix, and ITGA6) depending on cellular context; its activity is potentiated by CARM1-mediated methylation (read by TRIM29), and it forms heterodimers with other NFI family members as well as co-occupancy complexes with STAT5 and AR/FOXA1, while being subject to post-translational regulation via m6A-dependent mRNA stabilization (YTHDF2) and protein stability control (TRIM8 ubiquitin ligase).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NFIB is a site-specific transcription factor of the NFI family that binds the TGGCA/NFI motif in vivo and controls cell-fate decisions during development and oncogenesis by reprogramming chromatin accessibility and gene transcription [#1, #33, #10]. Mechanistically, NFIB functions as a pioneer-type factor: it physically associates with the pre-replication complex, binds and opens nucleosomes, promotes nucleosome eviction on parental chromatin, and is necessary and sufficient to open distal regulatory elements, linking its DNA-binding activity to both replication-origin licensing and metastatic enhancer programs [#26, #10]. Its transcriptional output is bidirectional and context-dependent: it represses targets such as Ezh2, CDKN1A/p21, and Edn2 [#7, #17, #6] and activates targets such as Nfix, ITGA6, ERO1A, NDUFA4L2, PINK1, and RIP2 [#14, #19, #22, #24, #31, #32], operating combinatorially at composite elements co-occupied with STAT5, the androgen receptor/FOXA1, and the glucocorticoid receptor [#8, #9, #33]. NFIB activity is potentiated by CARM1-mediated methylation read by the effector TRIM29, which maintains open chromatin and drives SCLC onset [#25], and is post-translationally tuned by m6A/YTHDF2-dependent mRNA stabilization and TRIM8-mediated protein-stability control [#27]. Developmentally, NFIB is required in a gene-dosage-sensitive manner for late fetal lung maturation, forebrain and corpus-callosum formation, precerebellar pontine development, and gliogenesis [#2, #4, #5], and human haploinsufficiency causes intellectual disability with macrocephaly [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Established that NFIB is a distinct member of a multigene NFI family of site-specific transcription factors sharing TGGCA-binding specificity, framing the question of how functional diversity arises among near-identical DNA binders.\",\n      \"evidence\": \"Peptide microsequencing and cDNA cloning with cross-species sequence alignment\",\n      \"pmids\": [\"2339052\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct functional reconstitution of NFIB DNA binding\", \"Does not explain target selectivity distinguishing NFIB from paralogs\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Showed that alternative RNA processing generates a truncated NFI-B3 isoform that heterodimerizes with other NFI members to act as a dominant-negative repressor, revealing that NFI output is tuned by isoform-driven heterodimerization.\",\n      \"evidence\": \"Alternative RNA processing characterization, reporter assays in SL-2 cells, and EMSA of heterodimer DNA binding\",\n      \"pmids\": [\"9099724\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous abundance and physiological role of NFI-B3 not established\", \"Does not address full-length NFIB target gene control\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated an in vivo developmental requirement: NFIB is needed for late lung maturation, with mutants failing to down-regulate TGF-\\u03b21 and Shh, implicating NFIB as a repressive gate on these signals.\",\n      \"evidence\": \"Nfib knockout mouse with histology and in situ expression analysis\",\n      \"pmids\": [\"11850179\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect repression of TGF-\\u03b21/Shh not resolved\", \"No genome-wide binding data in this study\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the multi-organ, dosage-sensitive developmental role of NFIB across lung and forebrain, establishing haploinsufficiency as a physiologically relevant mode of action.\",\n      \"evidence\": \"Nfib knockout mouse with histology, immunohistochemistry, neuroanatomical analysis of homozygous and heterozygous animals\",\n      \"pmids\": [\"15632069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular targets underlying each organ phenotype not identified here\", \"Cell-autonomy not dissected\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolved cellular mechanisms of NFIB-dependent brain development, showing non-cell-autonomous control of midline glial differentiation and pontine neuron production, and establishing functional specificity of NFIB relative to NFIA/NFIX.\",\n      \"evidence\": \"Nfib, Nfia, Nfix knockout mice with retrograde tracing, IHC, proliferation/apoptosis and migration analyses\",\n      \"pmids\": [\"19961580\", \"19107796\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets driving glial/neuronal phenotypes not defined\", \"Basis of NFIB-specific function among paralogs unexplained\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided the first direct genomic target via ChIP-seq, showing NFIB represses Edn2 in hair follicle stem cells to restrain melanocyte stem cell differentiation, with pharmacological rescue confirming the pathway.\",\n      \"evidence\": \"HFSC-specific conditional KO, ChIP-seq, transcriptional profiling, and endothelin/KIT pharmacological rescue\",\n      \"pmids\": [\"23389444\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors mediating Edn2 repression not identified\", \"Generalizability of repression mode to other tissues not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined NFIB's combinatorial chromatin logic by mapping in vivo motif binding, activator-biased promoter occupancy with the glucocorticoid receptor, and direct co-occupancy with STAT5 at mammary enhancers, plus direct repression of Ezh2 in cortex.\",\n      \"evidence\": \"ChIP-seq for NFIB/STAT5 in mammary tissue, NFIB lung ChIP-seq with Nr3c1 integration, and ChIP plus reporter assays for Ezh2 in KO mice\",\n      \"pmids\": [\"24661679\", \"24678731\", \"24553933\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of activator vs repressor outcome at a given site unclear\", \"Direct physical contact with GR not demonstrated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended NFIB co-regulation to AR/FOXA1 networks and to viral transcription, positioning NFIB as a context-dependent modulator of androgen signaling and a repressor at the HIV-1 LTR.\",\n      \"evidence\": \"ChIP-seq in LNCaP, NFIB knockdown, prostate KO engraftment; and ChIP plus knockdown at the HIV-1 LTR in T-cell lines\",\n      \"pmids\": [\"26677878\", \"25664610\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of AR co-occupancy (direct binding vs tethering) not resolved\", \"HIV-1 LTR repression mechanism not detailed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established NFIB as a chromatin-accessibility driver in SCLC metastasis, showing copy-number amplification opens distal elements and that NFIB is necessary and sufficient to increase accessibility and pro-metastatic neuronal programs.\",\n      \"evidence\": \"SCLC GEMMs with ATAC-seq, genome-wide binding analysis, and gain/loss-of-function in cell lines\",\n      \"pmids\": [\"27374332\", \"27373156\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biophysical basis of NFIB-driven accessibility not yet shown\", \"Cofactors required for pro-metastatic program incompletely defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed NFIB in post-transcriptional lineage-restriction circuits and revealed tissue-dependent tumor-suppressive output, broadening its functional repertoire beyond a single activity.\",\n      \"evidence\": \"Conditional Drosha deletion with NFIB knockdown rescue in adult NSCs; ectopic NFIB in patient-derived GBM cells with phospho-STAT3 readout\",\n      \"pmids\": [\"27545503\", \"27083054\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How NFIB toggles between oncogenic and tumor-suppressive roles unresolved\", \"Direct NFIB targets in GBM/STAT3 axis not mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Built the NFI auto-regulatory and protein-interaction architecture, showing NFIB activates Nfix, heterodimerizes additively with NFIA in cortex, and represses ESR1 transactivation in complex with YBX1/FOXA1; in melanoma NFIB drives invasion via an EZH2\\u2192MITF axis.\",\n      \"evidence\": \"Nfia/Nfib KO mice with Nfix promoter reporters, compound KO and co-IP, ESR1/FOXA1 co-IP with reporter assays, and melanoma knockdown/overexpression invasion assays\",\n      \"pmids\": [\"29106906\", \"32166136\", \"29180470\", \"28119061\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and DNA-binding consequences of NFIA/NFIB heterodimers in vivo unclear\", \"Whether ESR1 repression requires NFIB DNA binding not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Confirmed disease causation and direct cell-cycle control, linking human NFIB haploinsufficiency to intellectual disability with macrocephaly and demonstrating direct repression of CDKN1A/p21 governing apoptosis and chemosensitivity.\",\n      \"evidence\": \"Human variant cohort with reporter assays and cortex-specific KO mouse MRI; ChIP at CDKN1A with siRNA and double-knockdown epistasis plus drug-sensitivity assays\",\n      \"pmids\": [\"30388402\", \"30350349\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full target set explaining macrocephaly not enumerated\", \"Context dictating p21 repression vs activation unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Expanded the direct-activator target catalog into cancer metastasis programs by identifying ITGA6 as a directly bound NFIB target mediating colorectal metastasis.\",\n      \"evidence\": \"ChIP, luciferase reporter, and NFIB knockdown functional assays in CRC cells\",\n      \"pmids\": [\"31754405\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cofactors at the ITGA6 promoter not identified\", \"In vivo requirement not tested in this study\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed how NFIB is co-opted oncogenically through enhancer hijacking and identified KDM4D/MLL1 as a chromatin-modifying interaction module enabling NFIB-dependent gene activation.\",\n      \"evidence\": \"RNA-seq/RT-PCR fusion mapping with super-enhancer analysis in pleomorphic adenoma; co-IP and ChIP of KDM4D with NFIB/MLL1 in adipogenesis with rescue\",\n      \"pmids\": [\"32654217\", \"32080306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether NFIB recruits or follows MLL1 at native loci unresolved\", \"Direct vs indirect role of NFIB protein in fusion-driven activation not separated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Mapped multiple direct metastasis- and stress-relevant targets (ERO1A, PINK1, CDH1/VIM, RIP2) and uncovered RNA-level (m6A/YTHDF2) and protein-level (TRIM8) regulation of NFIB itself, plus a sufficiency for astrocyte differentiation requiring MAPK.\",\n      \"evidence\": \"In vivo piggyBac NFIB overexpression with ERO1A promoter assays; ChIP at CDH1/VIM with m6A-seq, YTHDF2 RIP and TRIM8 co-IP; PINK1 and RIP2 ChIP/reporter assays; NFIB overexpression in hPSC-NPCs with MAPK inhibition\",\n      \"pmids\": [\"33751828\", \"38536119\", \"33981484\", \"35409172\", \"33949692\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Site of CARM1 methylation relative to these regulatory layers not yet connected here\", \"Tissue specificity of each target circuit not cross-validated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected NFIB to drug metabolism and therapy resistance, showing repression of CYP2D6 (with a pharmacogenomic variant correlate) and activation of NDUFA4L2 to limit ROS and confer sorafenib resistance.\",\n      \"evidence\": \"NFIB overexpression in Huh7/liver spheroids with patient genotyping; ChIP at NDUFA4L2 with ROS measurement and in vivo tumor assay\",\n      \"pmids\": [\"35253216\", \"36369883\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cofactors switching NFIB between CYP2D6 repression and NDUFA4L2 activation unknown\", \"Direct binding at CYP2D6 not shown in this study\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided mechanistic, biophysical understanding: NFIB is a pioneer factor that opens nucleosomes and partners with the pre-RC to license replication origins, and its chromatin-opening oncogenic activity is gated by CARM1 methylation read by TRIM29.\",\n      \"evidence\": \"Co-IP with pre-RC, ATAC-seq, nucleosome binding assays, single-molecule magnetic tweezers, TEM and Hi-C; plus CARM1 methylation/TRIM29 pulldown with SCLC GEMM and ATAC-seq, and a NAD+/NAMPT metabolic axis in CRC\",\n      \"pmids\": [\"37604829\", \"36690626\", \"37491379\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How replication-licensing role integrates with transcriptional targeting unresolved\", \"Structure of NFIB-nucleosome and NFIB-pre-RC complexes undetermined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Refined the oncogenic model by genetic dissection, showing NFIB contributes to but is dispensable for SCLC metastasis, with FOXA1/2 as candidate compensatory drivers, underscoring tumor plasticity.\",\n      \"evidence\": \"Conditional Nfib knockout in SCLC GEMM with molecular profiling\",\n      \"pmids\": [\"37963187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of FOXA1/2 compensation not defined\", \"Reconciliation with earlier necessity/sufficiency claims incomplete\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single TGGCA-binding factor selects activating versus repressing outcomes at different loci and how its pioneer/replication-licensing function is mechanistically coupled to context-specific transcriptional programs.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of NFIB on nucleosomes or with the pre-RC\", \"Rules governing cofactor selection (STAT5 vs AR/FOXA1 vs GR vs MLL1) not defined\", \"Determinants of activator vs repressor behavior at a given promoter unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 7, 17, 19, 33, 25]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [33, 26, 7, 17]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [23, 26, 7]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [33, 7, 17, 25]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [10, 26, 25]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 4, 5, 14]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [10, 11, 18, 35]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"complexes\": [\"pre-replication complex (associated)\", \"MLL1 complex (associated)\"],\n    \"partners\": [\"STAT5\", \"AR\", \"FOXA1\", \"ESR1\", \"YBX1\", \"KDM4D\", \"CARM1\", \"TRIM29\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}