{"gene":"ONECUT1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1997,"finding":"HNF-6 encodes a cut-homeodomain-containing transcription factor that directly binds DNA and activates expression of reporter genes driven by HNF-6 binding sites from the HNF-3β and transthyretin (TTR) promoter regions, establishing HNF-3β as a transcriptional target of HNF-6.","method":"Yeast one-hybrid system (cDNA isolation), cotransfection reporter assays","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast one-hybrid plus cotransfection reporter assays in single study, two orthogonal methods","pmids":["9441664"],"is_preprint":false},{"year":1997,"finding":"HNF-6 transcriptionally stimulates the HNF-4 and HNF-3β promoters, placing HNF-6 upstream of these factors in a liver transcription factor regulatory network.","method":"Transfection/reporter assays in hepatic cells","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transfection assays, single lab, two target genes tested","pmids":["9441665"],"is_preprint":false},{"year":1998,"finding":"HNF-6 and HNF-1 bind the protein C gene promoter in a mutually exclusive manner; a -14 T→C mutation reduces HNF-6 binding and abolishes HNF-6-mediated transactivation, demonstrating HNF-6 is a direct transcriptional activator of the protein C gene.","method":"DNA binding (EMSA), transient transfection/reporter assays, site-directed mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — EMSA plus mutagenesis plus reporter assays, multiple orthogonal methods in a single focused study","pmids":["9553065"],"is_preprint":false},{"year":2000,"finding":"GH stimulates transcription of the hnf6 gene via a mechanism requiring STAT5 binding (~-110 bp) and HNF-4 binding (~-650 bp) in the hnf6 promoter; both STAT5 binding and HNF-4 binding affinity are increased in liver within 1 h of GH injection.","method":"DNA binding assays (EMSA), transfection with site-directed mutagenesis of promoter-reporter constructs, in vivo GH treatment of hypophysectomized rats","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 1 / Strong — EMSA, mutagenesis, reporter assays, and in vivo validation in multiple complementary experiments","pmids":["10674400"],"is_preprint":false},{"year":2000,"finding":"Persistent HNF-6 expression in pancreatic endocrine cells (beyond E18.5) via pdx1(PB) transgene causes disrupted islet architecture, loss of GLUT2 expression in beta cells, and diabetes, demonstrating that timely downregulation of HNF-6 in endocrine cells is required for normal islet organization and beta cell function.","method":"Transgenesis (pdx1(PB)-HNF6 mice), histology, marker analysis, glucose challenge","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo transgenic loss-of-function/gain-of-function with specific cellular and physiological phenotypes, replicated across multiple marker analyses","pmids":["10851133"],"is_preprint":false},{"year":2002,"finding":"HNF-6 is required for normal development of the biliary tract: Hnf6−/− mice lack a gallbladder, show abnormal extrahepatic bile ducts, and have perturbed intrahepatic bile duct development. HNF-6 directly stimulates the Hnf1β promoter, and HNF1β expression is downregulated in Hnf6−/− intrahepatic bile ducts, establishing a HNF6→HNF1β regulatory cascade in biliary development.","method":"Hnf6−/− mouse phenotype analysis, promoter-reporter assays (HNF-6 stimulation of Hnf1β promoter), immunostaining","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse phenotyping combined with promoter activation assay, multiple orthogonal methods","pmids":["11934848"],"is_preprint":false},{"year":2002,"finding":"HNF-6 directly activates the Glut-2 promoter via sequences at -185 to -144 bp; only HNF-6 (not HNF-3 proteins) binds this region and provides transcriptional activation, and maintaining HNF-6 during AdHNF3β infection restores hepatic Glut-2 levels and glycogen.","method":"In vivo adenoviral co-infection, DNA binding assays, cotransfection assays in HepG2 cells","journal":"Hepatology","confidence":"High","confidence_rationale":"Tier 1 / Strong — DNA binding (EMSA), cotransfection reporter assays, and in vivo adenoviral rescue experiments using multiple orthogonal methods","pmids":["11915024"],"is_preprint":false},{"year":2003,"finding":"HNF-6 controls timing of pancreas specification upstream of Pdx-1: onset of Pdx-1 expression is delayed in Hnf6−/− embryos in both ventral and dorsal endoderm, and HNF-6 directly stimulates the Pdx1 promoter in transfection assays.","method":"Hnf6−/− mouse phenotype analysis, promoter-reporter (cotransfection) assays","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KO phenotype plus direct promoter stimulation assay, two orthogonal methods","pmids":["12781686"],"is_preprint":false},{"year":2003,"finding":"HNF-6 physically interacts with FoxA2 through the HNF-6 Cut-Homeodomain and FoxA2 winged-helix DNA binding domains; HNF-6 acts as a coactivator to synergistically stimulate FoxA2 transcriptional activity by recruiting p300/CBP coactivators via an LXXLL sequence in the Cut domain. Conversely, increased FoxA2 levels inhibit HNF-6 DNA binding at HNF-6-specific sites, repressing HNF-6 activation of the Glut-2 promoter.","method":"HepG2 cotransfection assays, protein-binding assays, site-directed mutagenesis of LXXLL, DNA binding assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — protein interaction assays, mutagenesis, cotransfection, and DNA binding assays in a single rigorous study with multiple orthogonal methods","pmids":["12509444"],"is_preprint":false},{"year":2004,"finding":"HNF-6 directly activates the CYP7A1 promoter through sequences at -206/-194 bp as demonstrated by deletional and mutational analyses; increasing HNF-6 levels in vivo (by adenovirus or GH treatment) induces CYP7A1 mRNA, linking HNF-6 to bile acid homeostasis.","method":"Cotransfection with deletional/mutational promoter analysis, in vivo adenoviral infection, GH treatment model","journal":"Hepatology","confidence":"High","confidence_rationale":"Tier 1 / Strong — promoter mutagenesis plus in vivo adenoviral and GH-treatment validation, multiple orthogonal methods","pmids":["15349898"],"is_preprint":false},{"year":2004,"finding":"HNF6/OC-2 and HNF1 binding sites in the HNF4α P2 promoter are functional; HNF6/OC-2 double-deficient embryos show reduced HNF4α7 transcript levels, and HNF4α1 represses P2 activity, establishing a developmental switch from HNF6/OC-2-driven P2 to HNF4α1-driven P1 promoter activity.","method":"Site-directed mutagenesis of P2 promoter, double-KO mouse analysis, transient transgenesis, transfection assays, quantitative PCR","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo double-KO validation combined with promoter mutagenesis and reporter assays, multiple orthogonal methods","pmids":["15159395"],"is_preprint":false},{"year":2004,"finding":"HNF-6 indirectly inhibits Foxa1 expression by suppressing TGF-β signaling: in Hnf6−/− liver/cells, TGF-β receptor II is upregulated, leading to increased TGF-β signaling that drives Foxa1 expression. Inhibition of TGF-β signaling in Hnf6−/− cells down-regulates Foxa1.","method":"Hnf6−/− mouse analysis, BMEL cell lines, TGF-β signaling inhibition experiments","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO plus cell-based rescue, single lab, two orthogonal approaches","pmids":["15562441"],"is_preprint":false},{"year":2006,"finding":"C/EBPα forms a protein complex with HNF-6 requiring the HNF-6 cut domain and C/EBPα AD1/AD2 sequences; this complex stimulates HNF-6-dependent transcription by recruiting the CBP coactivator. Co-immunoprecipitation from liver extracts confirms the in vivo association between HNF-6, C/EBPα, and CBP. ChIP assays show that increased C/EBPα and HNF-6 are required for association with the endogenous Foxa2 promoter.","method":"HepG2 cotransfection assays, protein-binding assays, co-immunoprecipitation from liver extracts, chromatin immunoprecipitation (ChIP), adenovirus E1A inhibition","journal":"Hepatology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reciprocal co-IP from liver extracts, ChIP, cotransfection with mutagenesis, multiple orthogonal methods in one study","pmids":["16440369"],"is_preprint":false},{"year":2006,"finding":"vHNF1/TCF2 acts upstream of HNF6 in the embryonic endoderm via a functional binding site in an intronic enhancer of the Hnf6 gene; loss of vHNF1 reduces HNF6 expression, establishing a vHNF1→HNF6→Pdx1 cascade controlling pancreatic precursor cell generation.","method":"In vitro and in vivo protein-DNA interaction (EMSA, footprinting), endoderm electroporation, transgenesis, gene inactivation in embryos","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo gene inactivation, enhancer mapping, protein-DNA binding, and transgenesis in a single study with multiple orthogonal methods","pmids":["16380477"],"is_preprint":false},{"year":2007,"finding":"Crystal structure of the bipartite DNA-binding domain (single cut domain + homeodomain) of HNF-6α complexed with its binding site from the TTR promoter reveals the DNA recognition mechanism and structural basis for the dual mode of transcriptional activation dependent on target gene context.","method":"X-ray crystallography (crystal structure determination)","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure of protein-DNA complex with functional discussion of DNA recognition mechanism","pmids":["17223534"],"is_preprint":false},{"year":2007,"finding":"HNF-6/OC-1 and OC-2 redundantly stimulate degradation of the basal lamina surrounding the liver bud and promote hepatoblast migration into the septum transversum, operating in a gene network with E-cadherin, thrombospondin-4, and osteopontin.","method":"Double-knockout mouse analysis, gene expression analysis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — double-KO mouse phenotyping with gene expression analysis, single lab","pmids":["17936262"],"is_preprint":false},{"year":2008,"finding":"SHP (NR0B2) physically interacts with HNF-6 in vitro, co-localizes with HNF-6 in the nucleus, and represses HNF-6 transcriptional activity by inhibiting HNF-6 DNA binding at HNF-6-response elements; SHP represses HNF-6 target genes G6Pase and PEPCK in cells.","method":"Cotransfection assays, protein-protein binding assays, EMSA, ChIP, confocal microscopy, adenoviral SHP and SHP siRNA experiments","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — protein interaction assays, EMSA, ChIP, and functional transcription assays in a single study with multiple orthogonal methods","pmids":["18459945"],"is_preprint":false},{"year":2009,"finding":"HNF6 directly activates the Ngn3 (pro-endocrine) gene promoter in the developing pancreas; conditional inactivation of HNF6 from Ngn3-expressing cells reduces multipotent progenitor cells entering the endocrine lineage, establishing HNF6 as a direct upstream activator of Ngn3.","method":"Conditional gene inactivation (Cre-lox), reporter/promoter assays","journal":"Mechanisms of development","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in vivo with direct promoter activation assay, two orthogonal methods","pmids":["19766716"],"is_preprint":false},{"year":2009,"finding":"miR-495 and miR-218 post-transcriptionally repress HNF-6 and OC-2 respectively by targeting their 3'UTRs; overexpression of these miRNAs in cultured cells decreases endogenous HNF-6 and OC-2 mRNA levels.","method":"Transient transfection with miRNA mimics, 3'UTR reporter assays, endogenous mRNA quantification","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 3'UTR reporter and endogenous knockdown, two orthogonal methods, single lab","pmids":["19913497"],"is_preprint":false},{"year":2012,"finding":"HNF6 and Sox9 are ectopically induced in acinar cells during acinar-to-ductal metaplasia (ADM); HNF6 is required for repression of acinar genes, modulation of ADM-associated cell polarity changes, and activation of ductal genes in metaplastic acinar cells, as shown by gain- and loss-of-function experiments.","method":"Immunostaining in human and mouse pancreas, gain- and loss-of-function experiments in cultured cells and mouse ADM models","journal":"Gut","confidence":"High","confidence_rationale":"Tier 2 / Strong — combined gain-of-function and loss-of-function in vivo and in vitro, human tissue validation, multiple orthogonal approaches","pmids":["22271799"],"is_preprint":false},{"year":2012,"finding":"Glis3 directly binds the Ngn3 promoter and interacts physically with HNF6 in vitro and in vivo; the amino-terminus of Glis3 and the homeodomain of HNF6 are critical for this interaction, suggesting cooperative regulation of Ngn3 expression.","method":"Chromatin immunoprecipitation (binding to Ngn3 promoter), luciferase reporter assay, co-immunoprecipitation, in vitro protein interaction assays","journal":"Molecules and cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP in vivo plus in vitro binding assay and reporter assay, single lab","pmids":["22820919"],"is_preprint":false},{"year":2012,"finding":"HNF-6 regulates in spinal motor neurons the expression of agrin, neuregulin-2, and TGF-β receptor II, which are required for neuromuscular junction formation; Hnf6 mutant mice have abnormal NMJ morphology and defective synaptophysin localization, and defects in NMJ-like co-culture structures are rescued by recombinant agrin and neuregulin.","method":"Hnf6 mutant mouse analysis (histology, behavioral tests), gene expression analysis, spinal cord slice/myotube co-culture with recombinant factor rescue","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KO phenotyping combined with rescue experiment in co-culture, multiple orthogonal methods","pmids":["23227180"],"is_preprint":false},{"year":2013,"finding":"Onecut1 (Oc1) is required for horizontal cell (HC) genesis in the retina: ~80% of HCs fail to form in retina-specific Oc1 KO mice. Epistasis analysis places Oc1 downstream of FoxN4, in parallel with Ptf1a, and upstream of Lim1 and Prox1. Oc1 and Ptf1a together are sufficient (in utero electroporation) to determine HC fate.","method":"Retina-specific Oc1 knockout, in utero electroporation for gain-of-function, genetic epistasis analysis with multiple TF mutants","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO phenotyping plus gain-of-function electroporation and genetic epistasis, multiple orthogonal methods","pmids":["23926259"],"is_preprint":false},{"year":2013,"finding":"Onecut1 is sufficient to induce cells with earliest markers of cones and horizontal cells; interference with Onecut1 transcriptional activity leads to precocious rod development. A cis-regulatory module (ThrbCRM1) for the Thrb gene is combinatorially regulated by Otx2 and Onecut1, placing Onecut1 in control of cone vs. rod photoreceptor fate.","method":"Retinal electroporation for gain- and dominant-negative loss-of-function, cis-regulatory element analysis","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function and dominant-negative loss-of-function with CRM analysis, multiple orthogonal experiments","pmids":["23867227"],"is_preprint":false},{"year":2013,"finding":"Let-7b and miR-495 repress HNF6 in pancreatic acinar cells; inhibition of these miRNAs (or Dicer inactivation) leads to HNF6 induction, repression of acinar differentiation, and induction of hepatic genes. Overexpression of HNF6 alone in developing acinar cells is sufficient to repress acinar differentiation. The Dicer-deficient acinar phenotype depends on HNF6 induction (epistasis in Dicer/Hnf6 double-KO).","method":"Pancreas/acinar-specific Dicer KO mice, Dicer/Hnf6 double-KO epistasis, miRNA mimic/inhibitor transfection in acinar cells","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic epistasis (double KO), gain-of-function, and miRNA modulation, multiple orthogonal methods","pmids":["23684747"],"is_preprint":false},{"year":2014,"finding":"Onecut1 and Onecut2 act redundantly in retinal development: double-null mice show complete absence of HCs, reduced RGC production, failed starburst amacrine cell genesis, and compromised cone generation. RNA-Seq identified downstream targets, confirming redundancy and showing that onecut factors suppress rod fate, contributing to retinal progenitor competence for early cell fates.","method":"Oc1/Oc2 double-knockout mice, RNA-Seq expression profiling, retinal cell type quantification","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — double-KO mouse phenotyping with RNA-Seq downstream target identification, multiple orthogonal approaches","pmids":["25228773"],"is_preprint":false},{"year":2015,"finding":"CUX2 competes with HNF6 for DNA binding at shared genomic binding sites in liver chromatin; in cell-based assays, CUX2 inhibits HNF6 transcriptional regulation of sex-specific gene promoters (CYP2C11, CYP2C12). ChIP-seq identified ~40,000 HNF6-binding sites in mouse liver, with ~90% of CUX2 binding sites co-occupied by HNF6.","method":"Cell-based transfection reporter assays, in vitro EMSA, ChIP-seq (HNF6 cistrome mapping)","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 1 / Strong — genome-wide ChIP-seq cistrome mapping, EMSA competition, and reporter assays, multiple orthogonal methods","pmids":["26218442"],"is_preprint":false},{"year":2015,"finding":"Onecut1 and Onecut2 operate downstream of Pax6 in retinal development to maintain horizontal cells; in Pax6-deficient retinas, Onecut1/2 expression is lost, and compound Onecut1/2 mutants show complete loss of HCs. Genes for HC development (Foxn4, Ptf1a, Prox1, Lim1) show that HCs are initially formed but not maintained in Onecut-deficient retinas.","method":"Single and compound Onecut1/Onecut2 KO mouse analysis, Pax6 conditional KO, immunostaining for HC markers and TF expression","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple KO models with genetic epistasis, replicated across labs","pmids":["25794677"],"is_preprint":false},{"year":2016,"finding":"HNF6 acts as a transcriptional repressor of lipogenic genes in adult liver: liver-specific deletion of HNF6 causes hepatic steatosis, upregulates lipogenic genes directly bound by HNF6, and reduces binding of the circadian nuclear receptor Rev-erbα at these sites, revealing a novel mechanism by which HNF6 represses lipid metabolism genes and facilitates Rev-erbα occupancy.","method":"Adult liver-specific HNF6 deletion (Cre-lox), RNA-seq/gene expression, ChIP-seq for HNF6 and Rev-erbα binding","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in vivo combined with ChIP-seq mapping of HNF6 and Rev-erbα co-occupancy, multiple orthogonal methods","pmids":["27445394"],"is_preprint":false},{"year":2016,"finding":"GH mediates its hepatoprotective effect against apoptosis through HNF6; GH-mediated suppression of caspase-3/-8/-9 and hepatic apoptosis during bile duct ligation is abrogated in Hnf6 conditional KO mice. ChIP and EMSA identified Ciap1 (Birc2) as a direct HNF6 target gene mediating this anti-apoptotic effect.","method":"Hnf6 conditional KO mouse model, bile duct ligation, primary hepatocyte cultures, ChIP-on-chip and EMSA","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in vivo with ChIP and EMSA identifying a direct target, multiple orthogonal methods","pmids":["27936029"],"is_preprint":false},{"year":2019,"finding":"Oc1 (HNF6) is a direct transcriptional regulator of pancreatic exocrine (acinar) differentiation: ChIP-seq in embryonic pancreas identified ~1000 direct Oc1 target genes including acinar regulatory factors (Nr5a2, Ptf1a, Gata4, Mist1) and functional genes (Amylase, Cpa1, Prss1, Spink1), as well as ductal factors Hnf1β and FoxA2.","method":"ChIP-seq (direct target identification), RNA-seq on Oc1-deficient pancreas, immunofluorescence validation","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP-seq for direct binding combined with RNA-seq and protein-level validation in a single focused study","pmids":["30831323"],"is_preprint":false},{"year":2021,"finding":"Loss of ONECUT1 in human pluripotent stem cell differentiation impairs pancreatic progenitor formation and endocrine program. ONECUT1 loss alters transcription factor binding, enhancer activity, and NKX2.2/NKX6.1 expression in pancreatic progenitors, establishing ONECUT1 as a regulator of transcriptional and epigenetic machinery in endocrine development.","method":"hPSC directed differentiation with ONECUT1 loss-of-function, ChIP-seq, ATAC-seq, RNA-seq","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 1 / Strong — multi-omic analysis (ChIP-seq, ATAC-seq, RNA-seq) in human stem cell model, multiple orthogonal methods in a rigorous study","pmids":["34663987"],"is_preprint":false},{"year":2021,"finding":"Stage-specific RNA-seq, ChIP-seq, and ATAC-seq during hPSC pancreatic differentiation identify ONECUT1 as a crucial fate regulator in pancreas progenitors that prepares progenitors for later endocrine specification, acting within a transcriptional and epigenetic regulatory circuitry.","method":"RNA-seq, ChIP-seq, ATAC-seq during hPSC pancreatic differentiation","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multi-omic approach (RNA-seq, ChIP-seq, ATAC-seq), multiple orthogonal methods in a single rigorous study","pmids":["34789845"],"is_preprint":false},{"year":2024,"finding":"A long-range enhancer ~664 kb from the ONECUT1 promoter (ONECUT1e-664kb) is required for ONECUT1 expression during pancreatic differentiation; homozygous deletion of this enhancer in hPSCs causes near-complete loss of ONECUT1 expression and impaired pancreatic differentiation. A T2D-associated variant (rs528350911) in this enhancer disrupts a GATA motif and reduces binding of GATA4, GATA6, and FOXA2.","method":"CRISPRi screen in hPSC pancreatic differentiation, homozygous enhancer deletion, ChIP for TF binding at risk variant, hPSC differentiation assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — CRISPRi screen, homozygous deletion, ChIP validation, multiple orthogonal methods in a focused study","pmids":["39163202"],"is_preprint":false},{"year":2025,"finding":"ONECUT1 transcriptionally activates PSAT1 by directly binding to the PSAT1 promoter, as confirmed by ChIP and dual luciferase assays; ONECUT1 overexpression in lung squamous cell carcinoma cells restores PSAT1-mediated upregulation of PD-L1 expression and immune evasion.","method":"ChIP assay, dual luciferase reporter assay, overexpression/knockdown experiments, flow cytometry, co-culture assays","journal":"Tissue & cell","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP and luciferase assays in a single cancer cell line study, single lab","pmids":["40907151"],"is_preprint":false},{"year":2025,"finding":"ONECUT1 functions as a tumor suppressor downstream of activated β-Catenin in hepatoblastoma; β-Catenin activation suppresses ONECUT1 expression, and co-expression of ONECUT1 with YAP/β-Catenin strongly suppresses hepatoblastoma formation. ONECUT1 negatively regulates tumor cell glycolysis and reshapes the tumor immune microenvironment.","method":"Inducible transposon-based murine HB model, doxycycline-inducible ONECUT1 expression, transcriptomic analysis, T cell depletion experiments","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo murine model with inducible expression and transcriptomic analysis plus immune depletion, two orthogonal in vivo approaches","pmids":["39999468"],"is_preprint":false}],"current_model":"ONECUT1/HNF-6 is a bipartite DNA-binding transcription factor (single cut domain + homeodomain, structurally resolved by X-ray crystallography) that acts as a direct transcriptional activator of key developmental genes (HNF-3β, HNF-4, HNF1β, Pdx1, Ngn3, Glut-2, CYP7A1, Ciap1, acinar genes) and, in adult liver, also as a transcriptional repressor of lipogenic genes; it interacts with multiple co-regulators (FoxA2, C/EBPα, CBP/p300, SHP, CUX2, Glis3) to modulate its activity, is controlled upstream by GH via STAT5/HNF-4 at its promoter and by vHNF1/TCF2 via an intronic enhancer, is post-transcriptionally repressed by miR-495 and miR-218, and is essential in vivo for biliary tract morphogenesis (via an HNF6→HNF1β cascade), pancreas specification and endocrine differentiation, retinal horizontal cell genesis (positioned downstream of FoxN4, upstream of Lim1/Prox1), neuromuscular junction formation in motor neurons, and hepatic lipid homeostasis in adults."},"narrative":{"mechanistic_narrative":"ONECUT1 (HNF-6) is a bipartite cut-homeodomain transcription factor whose single cut domain and homeodomain together recognize DNA, with X-ray crystallography of the domain bound to a transthyretin-promoter site defining the recognition mechanism that underlies its dual mode of activation [PMID:17223534]. As a direct activator it binds and stimulates promoters of a hepatic/endoderm transcription-factor network, including HNF-3β, HNF-4, the protein C gene, Glut-2, Pdx1, Ngn3, Hnf1β and CYP7A1 [PMID:9441664, PMID:9441665, PMID:9553065, PMID:11934848, PMID:11915024, PMID:12781686, PMID:15349898, PMID:19766716], positioning it at the apex of cascades that drive biliary tract morphogenesis (an HNF6→HNF1β cascade) and pancreas specification and endocrine differentiation [PMID:11934848, PMID:12781686, PMID:19766716]. Its activity is tuned by physical partners: it acts as a coactivator that synergizes with FoxA2 and recruits p300/CBP through an LXXLL motif in the cut domain [PMID:12509444], cooperates with C/EBPα to recruit CBP [PMID:16440369] and Glis3 at the Ngn3 promoter [PMID:22820919], while CUX2, SHP (NR0B2) and elevated FoxA2 antagonize it by competing for or inhibiting DNA binding [PMID:12509444, PMID:18459945, PMID:26218442]. Upstream, growth hormone induces hnf6 transcription via STAT5 and HNF-4 at the promoter [PMID:10674400], vHNF1/TCF2 acts through an intronic enhancer [PMID:16380477], and miR-495/miR-218/let-7b repress it post-transcriptionally [PMID:19913497, PMID:23684747]; a long-range enhancer ~664 kb away carrying a T2D-associated GATA-disrupting variant is required for its pancreatic expression [PMID:39163202]. In adult liver ONECUT1 switches to a repressor of lipogenic genes, facilitating Rev-erbα occupancy, such that its loss causes hepatic steatosis [PMID:27445394]. Beyond endoderm it directs retinal horizontal-cell and cone fate downstream of FoxN4/Pax6 and upstream of Lim1/Prox1, acting redundantly with Onecut2 [PMID:23926259, PMID:23867227, PMID:25228773, PMID:25794677], and regulates motor-neuron genes (agrin, neuregulin-2) required for neuromuscular junction formation [PMID:23227180].","teleology":[{"year":1997,"claim":"Established the core identity of HNF-6 as a cut-homeodomain DNA-binding transcription factor and placed it upstream of other liver transcription factors, answering what kind of molecule it is and where it sits in a regulatory hierarchy.","evidence":"Yeast one-hybrid cDNA isolation and cotransfection reporter assays on HNF-3β, TTR and HNF-4 promoters in hepatic cells","pmids":["9441664","9441665"],"confidence":"Medium","gaps":["Direct in vivo binding to endogenous targets not yet shown","No structural basis for DNA recognition"]},{"year":1998,"claim":"Demonstrated direct, sequence-specific transcriptional activation by HNF-6 at a defined promoter, converting the inferred activator role into a mutation-validated mechanism.","evidence":"EMSA, site-directed mutagenesis (-14 T→C) and reporter assays on the protein C gene promoter","pmids":["9553065"],"confidence":"High","gaps":["Single target gene","No genome-wide binding map"]},{"year":2000,"claim":"Defined upstream control of hnf6 by growth hormone and revealed gain-of-function consequences, showing both how the factor is regulated and that its levels must be temporally limited for normal islet function.","evidence":"EMSA and promoter mutagenesis with in vivo GH treatment of hypophysectomized rats; pdx1(PB)-HNF6 transgenic mice with histology and glucose challenge","pmids":["10674400","10851133"],"confidence":"High","gaps":["Mechanism of timed downregulation in endocrine cells not defined","Direct STAT5/HNF-4 cooperativity at the promoter not structurally resolved"]},{"year":2002,"claim":"Established in vivo developmental requirement for HNF-6 in biliary morphogenesis via a direct HNF6→HNF1β cascade and confirmed direct Glut-2 activation, linking the factor to organ development and hepatic glucose handling.","evidence":"Hnf6−/− mouse phenotyping with promoter-reporter assays and immunostaining; in vivo adenoviral co-infection and DNA binding for Glut-2","pmids":["11934848","11915024"],"confidence":"High","gaps":["Full set of biliary effectors downstream of HNF1β not enumerated","Intrahepatic vs extrahepatic duct mechanism differences unresolved"]},{"year":2003,"claim":"Positioned HNF-6 as a direct upstream timing regulator of pancreas specification and uncovered a partner-based mechanism for tuning its activity through FoxA2 and p300/CBP recruitment.","evidence":"Hnf6−/− embryo analysis with Pdx1 promoter assays; protein-binding, LXXLL mutagenesis, DNA binding and cotransfection for FoxA2 interaction","pmids":["12781686","12509444"],"confidence":"High","gaps":["Quantitative balance between coactivation and FoxA2-mediated inhibition in vivo unclear","Structural detail of the cut-homeodomain/winged-helix interface not resolved"]},{"year":2004,"claim":"Expanded the target repertoire (CYP7A1, HNF4α P2 promoter) and revealed indirect regulation via TGF-β suppression, broadening HNF-6 from a simple activator to a network hub with both direct and indirect outputs.","evidence":"Promoter mutagenesis with in vivo adenoviral/GH validation (CYP7A1); double-KO mice and transgenesis (HNF4α P2); Hnf6−/− cells with TGF-β inhibition (Foxa1)","pmids":["15349898","15159395","15562441"],"confidence":"High","gaps":["Direct vs indirect contributions to bile acid homeostasis not separated","Mechanism linking HNF-6 loss to TGF-βRII upregulation unknown"]},{"year":2006,"claim":"Defined a C/EBPα–HNF-6–CBP coactivation complex confirmed in vivo and showed vHNF1/TCF2 acts through an intronic enhancer upstream of HNF6, mapping both protein-complex and cis-regulatory inputs.","evidence":"Cotransfection, reciprocal co-IP from liver extracts and ChIP for C/EBPα; EMSA, footprinting, endoderm electroporation, transgenesis and gene inactivation for vHNF1","pmids":["16440369","16380477"],"confidence":"High","gaps":["Stoichiometry and structure of the HNF-6/C/EBPα/CBP complex unknown","Other inputs into the intronic enhancer not characterized"]},{"year":2007,"claim":"Resolved the crystal structure of the bipartite cut-homeodomain bound to DNA, providing the structural basis for sequence recognition and context-dependent dual activation.","evidence":"X-ray crystallography of the HNF-6α cut+homeodomain complexed with the TTR promoter site; double-KO mouse analysis of hepatoblast migration","pmids":["17223534","17936262"],"confidence":"High","gaps":["Structure of full-length protein with coactivators not solved","Basal-lamina degradation effectors only partly mapped"]},{"year":2008,"claim":"Identified SHP (NR0B2) as a repressor that inhibits HNF-6 DNA binding, adding a nuclear-receptor brake on gluconeogenic target genes G6Pase and PEPCK.","evidence":"Cotransfection, protein-binding, EMSA, ChIP, confocal microscopy and adenoviral SHP/siRNA experiments","pmids":["18459945"],"confidence":"High","gaps":["Physiological conditions triggering SHP-mediated repression not defined"]},{"year":2009,"claim":"Established HNF6 as a direct activator of the pro-endocrine gene Ngn3 required for progenitor entry into the endocrine lineage, and identified miRNA control of its mRNA.","evidence":"Conditional Cre-lox inactivation and Ngn3 promoter assays; miR-495/miR-218 3'UTR reporter and endogenous mRNA quantification","pmids":["19766716","19913497"],"confidence":"High","gaps":["In vivo relevance of miR-495/miR-218 regulation not tested","Co-factor requirements at the Ngn3 promoter not yet defined"]},{"year":2012,"claim":"Linked HNF6 to acinar-to-ductal metaplasia and identified Glis3 as a cooperative partner at Ngn3, refining how HNF6 toggles between acinar repression and ductal/endocrine programs.","evidence":"Gain/loss-of-function in cells and mouse ADM models with human tissue staining; ChIP, luciferase, co-IP and in vitro binding for Glis3; NMJ analysis in Hnf6 mutant mice with co-culture rescue","pmids":["22271799","22820919","23227180"],"confidence":"High","gaps":["Direct vs indirect acinar gene repression targets not all defined","Mechanism of motor-neuron target selection unclear"]},{"year":2013,"claim":"Defined ONECUT1's role in retinal fate determination (horizontal and cone cells, suppression of rod fate) and demonstrated miRNA-enforced repression maintains acinar identity, with HNF6 induction sufficient to derail it.","evidence":"Retina-specific KO, in utero/retinal electroporation and ThrbCRM1 cis-regulatory analysis; pancreas/acinar Dicer KO, Dicer/Hnf6 double-KO epistasis and miRNA modulation","pmids":["23926259","23867227","23684747"],"confidence":"High","gaps":["Combinatorial logic with Otx2/Ptf1a at cis-regulatory modules incompletely mapped","In vivo miRNA contribution to acinar identity quantitatively unresolved"]},{"year":2014,"claim":"Demonstrated functional redundancy with Onecut2 in retina, showing the two factors jointly confer progenitor competence for early cell fates and suppress rod fate.","evidence":"Oc1/Oc2 double-knockout mice with RNA-Seq target identification and cell-type quantification","pmids":["25228773"],"confidence":"High","gaps":["Direct vs indirect status of RNA-Seq targets not fully resolved"]},{"year":2015,"claim":"Mapped the genome-wide HNF6 cistrome (~40,000 sites) and revealed CUX2 competition at shared sex-specific gene loci, plus Pax6-dependent maintenance of Onecut expression in horizontal cells.","evidence":"ChIP-seq cistrome mapping, EMSA competition and reporter assays (CUX2); single/compound Onecut and Pax6 KO with marker immunostaining","pmids":["26218442","25794677"],"confidence":"High","gaps":["Determinants of activator vs repressor outcome at cistrome-wide sites not defined","How Pax6 maintains Onecut expression mechanistically unknown"]},{"year":2016,"claim":"Revealed HNF6's adult-liver function as a repressor of lipogenic genes that facilitates Rev-erbα occupancy, and as a GH-dependent anti-apoptotic factor acting through direct target Ciap1.","evidence":"Adult liver-specific deletion with RNA-seq and ChIP-seq for HNF6/Rev-erbα; Hnf6 conditional KO with bile duct ligation, ChIP-on-chip and EMSA for Ciap1","pmids":["27445394","27936029"],"confidence":"High","gaps":["Molecular switch between activator and repressor modes in liver not defined","Direct interaction with Rev-erbα not established"]},{"year":2019,"claim":"Genome-wide direct target mapping in embryonic pancreas established ONECUT1 as a direct regulator of both acinar and ductal gene programs, anchoring its exocrine differentiation role.","evidence":"ChIP-seq direct target identification, RNA-seq on Oc1-deficient pancreas and immunofluorescence validation","pmids":["30831323"],"confidence":"High","gaps":["Logic determining acinar vs ductal target output not resolved"]},{"year":2021,"claim":"Human pluripotent stem cell models established ONECUT1 as a regulator of transcriptional and epigenetic machinery preparing pancreatic progenitors for endocrine specification, translating mouse findings to human development.","evidence":"hPSC directed differentiation with loss-of-function, ChIP-seq, ATAC-seq and RNA-seq across stages","pmids":["34663987","34789845"],"confidence":"High","gaps":["Direct vs indirect control of enhancer accessibility not separated","Causal chain to NKX2.2/NKX6.1 not fully mapped"]},{"year":2024,"claim":"Identified a required long-range enhancer ~664 kb upstream and a T2D-associated variant disrupting GATA binding, connecting ONECUT1 cis-regulation to disease risk.","evidence":"CRISPRi screen in hPSC pancreatic differentiation, homozygous enhancer deletion and ChIP for GATA4/GATA6/FOXA2 at the risk variant","pmids":["39163202"],"confidence":"High","gaps":["Population-level penetrance of the variant not addressed","3D chromatin contact between enhancer and promoter not directly demonstrated"]},{"year":2025,"claim":"Extended ONECUT1 into cancer contexts as a regulator of metabolism and immune evasion, acting as a PSAT1 activator in lung squamous carcinoma and a tumor suppressor downstream of β-Catenin in hepatoblastoma.","evidence":"ChIP and luciferase assays with overexpression/knockdown and co-culture in LUSC cells; inducible transposon murine hepatoblastoma model with transcriptomics and T cell depletion","pmids":["40907151","39999468"],"confidence":"Medium","gaps":["Single cancer cell line for PSAT1 mechanism","Whether tumor-suppressive effect is cell-autonomous vs immune-mediated not fully separated"]},{"year":null,"claim":"The molecular switch that determines whether ONECUT1 acts as an activator or repressor at a given genomic site, and how its cofactor and chromatin context dictate context-specific outputs across endoderm, retina, motor neurons and tumors, remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of activator vs repressor cofactor complexes","Determinants of tissue-specific target selection not defined","Mechanistic basis for Rev-erbα facilitation not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,2,14,28,30]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2,14,26]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[8,12]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[16]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,2,30]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,7,22,25,31]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[28,9]}],"complexes":[],"partners":["FOXA2","CEBPA","CUX2","NR0B2","GLIS3","CREBBP","EP300","NR1D1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UBC0","full_name":"Hepatocyte nuclear factor 6","aliases":["One cut domain family member 1","One cut homeobox 1"],"length_aa":465,"mass_kda":51.0,"function":"Transcriptional activator. 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endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/31990658","citation_count":7,"is_preprint":false},{"pmid":"19123138","id":"PMC_19123138","title":"Expression of Xenopus tropicalis HNF6/Onecut-1.","date":"2009","source":"The International journal of developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/19123138","citation_count":7,"is_preprint":false},{"pmid":"11323086","id":"PMC_11323086","title":"Mutation screening of the hepatocyte nuclear factor (HNF)-6 gene in Japanese subjects with diabetes mellitus.","date":"2001","source":"Diabetes research and clinical practice","url":"https://pubmed.ncbi.nlm.nih.gov/11323086","citation_count":6,"is_preprint":false},{"pmid":"38926048","id":"PMC_38926048","title":"HNF6 and HNF4α expression in adenocarcinomas of the liver, pancreaticobiliary tract, and gastrointestinal tract: an immunohistochemical study of 480 adenocarcinomas of the digestive system.","date":"2024","source":"Pathology","url":"https://pubmed.ncbi.nlm.nih.gov/38926048","citation_count":5,"is_preprint":false},{"pmid":"10578522","id":"PMC_10578522","title":"Type-I protein-C deficiency caused by disruption of a hepatocyte nuclear factor (HNF)-6/HNF-1 binding site in the human protein-C gene promoter.","date":"1999","source":"Trends in cardiovascular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/10578522","citation_count":5,"is_preprint":false},{"pmid":"39999468","id":"PMC_39999468","title":"β-Catenin regulates distinct pathways from YAP and suppresses ONECUT1 to drive hepatoblastoma development in mice and humans.","date":"2025","source":"Hepatology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/39999468","citation_count":3,"is_preprint":false},{"pmid":"39427318","id":"PMC_39427318","title":"A ONECUT1 regulatory, non-coding region in pancreatic development and diabetes.","date":"2024","source":"Cell 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expression and mediate immune evasion of lung squamous cell carcinoma.","date":"2025","source":"Tissue & cell","url":"https://pubmed.ncbi.nlm.nih.gov/40907151","citation_count":1,"is_preprint":false},{"pmid":"16078569","id":"PMC_16078569","title":"[Expression of HNF4alpha and HNF6 mRNA during the process of mouse liver development].","date":"2005","source":"Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition","url":"https://pubmed.ncbi.nlm.nih.gov/16078569","citation_count":1,"is_preprint":false},{"pmid":"41937186","id":"PMC_41937186","title":"Overexpression of ONECUT1 suppresses hepatoblastoma progression via modulating tumor cell growth and tumor microenvironment.","date":"2026","source":"Cell & bioscience","url":"https://pubmed.ncbi.nlm.nih.gov/41937186","citation_count":0,"is_preprint":false},{"pmid":"39427317","id":"PMC_39427317","title":"CUTting through the distance: A disease-relevant long-range ONECUT1 enhancer.","date":"2024","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/39427317","citation_count":0,"is_preprint":false},{"pmid":"38746154","id":"PMC_38746154","title":"CRISPR Screening Uncovers a Long-Range Enhancer for ONECUT1 in Pancreatic Differentiation and Links a Diabetes Risk Variant.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/38746154","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.07.30.667746","title":"Developmental analysis of the cone photoreceptor-less little skate retina reveals distinct Onecut1 isoforms","date":"2025-07-31","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.30.667746","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":38891,"output_tokens":8874,"usd":0.124892,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18708,"output_tokens":6544,"usd":0.12857,"stage2_stop_reason":"end_turn"},"total_usd":0.253462,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"HNF-6 encodes a cut-homeodomain-containing transcription factor that directly binds DNA and activates expression of reporter genes driven by HNF-6 binding sites from the HNF-3β and transthyretin (TTR) promoter regions, establishing HNF-3β as a transcriptional target of HNF-6.\",\n      \"method\": \"Yeast one-hybrid system (cDNA isolation), cotransfection reporter assays\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast one-hybrid plus cotransfection reporter assays in single study, two orthogonal methods\",\n      \"pmids\": [\"9441664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"HNF-6 transcriptionally stimulates the HNF-4 and HNF-3β promoters, placing HNF-6 upstream of these factors in a liver transcription factor regulatory network.\",\n      \"method\": \"Transfection/reporter assays in hepatic cells\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transfection assays, single lab, two target genes tested\",\n      \"pmids\": [\"9441665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"HNF-6 and HNF-1 bind the protein C gene promoter in a mutually exclusive manner; a -14 T→C mutation reduces HNF-6 binding and abolishes HNF-6-mediated transactivation, demonstrating HNF-6 is a direct transcriptional activator of the protein C gene.\",\n      \"method\": \"DNA binding (EMSA), transient transfection/reporter assays, site-directed mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — EMSA plus mutagenesis plus reporter assays, multiple orthogonal methods in a single focused study\",\n      \"pmids\": [\"9553065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GH stimulates transcription of the hnf6 gene via a mechanism requiring STAT5 binding (~-110 bp) and HNF-4 binding (~-650 bp) in the hnf6 promoter; both STAT5 binding and HNF-4 binding affinity are increased in liver within 1 h of GH injection.\",\n      \"method\": \"DNA binding assays (EMSA), transfection with site-directed mutagenesis of promoter-reporter constructs, in vivo GH treatment of hypophysectomized rats\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — EMSA, mutagenesis, reporter assays, and in vivo validation in multiple complementary experiments\",\n      \"pmids\": [\"10674400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Persistent HNF-6 expression in pancreatic endocrine cells (beyond E18.5) via pdx1(PB) transgene causes disrupted islet architecture, loss of GLUT2 expression in beta cells, and diabetes, demonstrating that timely downregulation of HNF-6 in endocrine cells is required for normal islet organization and beta cell function.\",\n      \"method\": \"Transgenesis (pdx1(PB)-HNF6 mice), histology, marker analysis, glucose challenge\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo transgenic loss-of-function/gain-of-function with specific cellular and physiological phenotypes, replicated across multiple marker analyses\",\n      \"pmids\": [\"10851133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"HNF-6 is required for normal development of the biliary tract: Hnf6−/− mice lack a gallbladder, show abnormal extrahepatic bile ducts, and have perturbed intrahepatic bile duct development. HNF-6 directly stimulates the Hnf1β promoter, and HNF1β expression is downregulated in Hnf6−/− intrahepatic bile ducts, establishing a HNF6→HNF1β regulatory cascade in biliary development.\",\n      \"method\": \"Hnf6−/− mouse phenotype analysis, promoter-reporter assays (HNF-6 stimulation of Hnf1β promoter), immunostaining\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse phenotyping combined with promoter activation assay, multiple orthogonal methods\",\n      \"pmids\": [\"11934848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"HNF-6 directly activates the Glut-2 promoter via sequences at -185 to -144 bp; only HNF-6 (not HNF-3 proteins) binds this region and provides transcriptional activation, and maintaining HNF-6 during AdHNF3β infection restores hepatic Glut-2 levels and glycogen.\",\n      \"method\": \"In vivo adenoviral co-infection, DNA binding assays, cotransfection assays in HepG2 cells\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — DNA binding (EMSA), cotransfection reporter assays, and in vivo adenoviral rescue experiments using multiple orthogonal methods\",\n      \"pmids\": [\"11915024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"HNF-6 controls timing of pancreas specification upstream of Pdx-1: onset of Pdx-1 expression is delayed in Hnf6−/− embryos in both ventral and dorsal endoderm, and HNF-6 directly stimulates the Pdx1 promoter in transfection assays.\",\n      \"method\": \"Hnf6−/− mouse phenotype analysis, promoter-reporter (cotransfection) assays\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KO phenotype plus direct promoter stimulation assay, two orthogonal methods\",\n      \"pmids\": [\"12781686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"HNF-6 physically interacts with FoxA2 through the HNF-6 Cut-Homeodomain and FoxA2 winged-helix DNA binding domains; HNF-6 acts as a coactivator to synergistically stimulate FoxA2 transcriptional activity by recruiting p300/CBP coactivators via an LXXLL sequence in the Cut domain. Conversely, increased FoxA2 levels inhibit HNF-6 DNA binding at HNF-6-specific sites, repressing HNF-6 activation of the Glut-2 promoter.\",\n      \"method\": \"HepG2 cotransfection assays, protein-binding assays, site-directed mutagenesis of LXXLL, DNA binding assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — protein interaction assays, mutagenesis, cotransfection, and DNA binding assays in a single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"12509444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HNF-6 directly activates the CYP7A1 promoter through sequences at -206/-194 bp as demonstrated by deletional and mutational analyses; increasing HNF-6 levels in vivo (by adenovirus or GH treatment) induces CYP7A1 mRNA, linking HNF-6 to bile acid homeostasis.\",\n      \"method\": \"Cotransfection with deletional/mutational promoter analysis, in vivo adenoviral infection, GH treatment model\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — promoter mutagenesis plus in vivo adenoviral and GH-treatment validation, multiple orthogonal methods\",\n      \"pmids\": [\"15349898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HNF6/OC-2 and HNF1 binding sites in the HNF4α P2 promoter are functional; HNF6/OC-2 double-deficient embryos show reduced HNF4α7 transcript levels, and HNF4α1 represses P2 activity, establishing a developmental switch from HNF6/OC-2-driven P2 to HNF4α1-driven P1 promoter activity.\",\n      \"method\": \"Site-directed mutagenesis of P2 promoter, double-KO mouse analysis, transient transgenesis, transfection assays, quantitative PCR\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo double-KO validation combined with promoter mutagenesis and reporter assays, multiple orthogonal methods\",\n      \"pmids\": [\"15159395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HNF-6 indirectly inhibits Foxa1 expression by suppressing TGF-β signaling: in Hnf6−/− liver/cells, TGF-β receptor II is upregulated, leading to increased TGF-β signaling that drives Foxa1 expression. Inhibition of TGF-β signaling in Hnf6−/− cells down-regulates Foxa1.\",\n      \"method\": \"Hnf6−/− mouse analysis, BMEL cell lines, TGF-β signaling inhibition experiments\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO plus cell-based rescue, single lab, two orthogonal approaches\",\n      \"pmids\": [\"15562441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"C/EBPα forms a protein complex with HNF-6 requiring the HNF-6 cut domain and C/EBPα AD1/AD2 sequences; this complex stimulates HNF-6-dependent transcription by recruiting the CBP coactivator. Co-immunoprecipitation from liver extracts confirms the in vivo association between HNF-6, C/EBPα, and CBP. ChIP assays show that increased C/EBPα and HNF-6 are required for association with the endogenous Foxa2 promoter.\",\n      \"method\": \"HepG2 cotransfection assays, protein-binding assays, co-immunoprecipitation from liver extracts, chromatin immunoprecipitation (ChIP), adenovirus E1A inhibition\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reciprocal co-IP from liver extracts, ChIP, cotransfection with mutagenesis, multiple orthogonal methods in one study\",\n      \"pmids\": [\"16440369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"vHNF1/TCF2 acts upstream of HNF6 in the embryonic endoderm via a functional binding site in an intronic enhancer of the Hnf6 gene; loss of vHNF1 reduces HNF6 expression, establishing a vHNF1→HNF6→Pdx1 cascade controlling pancreatic precursor cell generation.\",\n      \"method\": \"In vitro and in vivo protein-DNA interaction (EMSA, footprinting), endoderm electroporation, transgenesis, gene inactivation in embryos\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo gene inactivation, enhancer mapping, protein-DNA binding, and transgenesis in a single study with multiple orthogonal methods\",\n      \"pmids\": [\"16380477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure of the bipartite DNA-binding domain (single cut domain + homeodomain) of HNF-6α complexed with its binding site from the TTR promoter reveals the DNA recognition mechanism and structural basis for the dual mode of transcriptional activation dependent on target gene context.\",\n      \"method\": \"X-ray crystallography (crystal structure determination)\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure of protein-DNA complex with functional discussion of DNA recognition mechanism\",\n      \"pmids\": [\"17223534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HNF-6/OC-1 and OC-2 redundantly stimulate degradation of the basal lamina surrounding the liver bud and promote hepatoblast migration into the septum transversum, operating in a gene network with E-cadherin, thrombospondin-4, and osteopontin.\",\n      \"method\": \"Double-knockout mouse analysis, gene expression analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — double-KO mouse phenotyping with gene expression analysis, single lab\",\n      \"pmids\": [\"17936262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SHP (NR0B2) physically interacts with HNF-6 in vitro, co-localizes with HNF-6 in the nucleus, and represses HNF-6 transcriptional activity by inhibiting HNF-6 DNA binding at HNF-6-response elements; SHP represses HNF-6 target genes G6Pase and PEPCK in cells.\",\n      \"method\": \"Cotransfection assays, protein-protein binding assays, EMSA, ChIP, confocal microscopy, adenoviral SHP and SHP siRNA experiments\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — protein interaction assays, EMSA, ChIP, and functional transcription assays in a single study with multiple orthogonal methods\",\n      \"pmids\": [\"18459945\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HNF6 directly activates the Ngn3 (pro-endocrine) gene promoter in the developing pancreas; conditional inactivation of HNF6 from Ngn3-expressing cells reduces multipotent progenitor cells entering the endocrine lineage, establishing HNF6 as a direct upstream activator of Ngn3.\",\n      \"method\": \"Conditional gene inactivation (Cre-lox), reporter/promoter assays\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in vivo with direct promoter activation assay, two orthogonal methods\",\n      \"pmids\": [\"19766716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"miR-495 and miR-218 post-transcriptionally repress HNF-6 and OC-2 respectively by targeting their 3'UTRs; overexpression of these miRNAs in cultured cells decreases endogenous HNF-6 and OC-2 mRNA levels.\",\n      \"method\": \"Transient transfection with miRNA mimics, 3'UTR reporter assays, endogenous mRNA quantification\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 3'UTR reporter and endogenous knockdown, two orthogonal methods, single lab\",\n      \"pmids\": [\"19913497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HNF6 and Sox9 are ectopically induced in acinar cells during acinar-to-ductal metaplasia (ADM); HNF6 is required for repression of acinar genes, modulation of ADM-associated cell polarity changes, and activation of ductal genes in metaplastic acinar cells, as shown by gain- and loss-of-function experiments.\",\n      \"method\": \"Immunostaining in human and mouse pancreas, gain- and loss-of-function experiments in cultured cells and mouse ADM models\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — combined gain-of-function and loss-of-function in vivo and in vitro, human tissue validation, multiple orthogonal approaches\",\n      \"pmids\": [\"22271799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Glis3 directly binds the Ngn3 promoter and interacts physically with HNF6 in vitro and in vivo; the amino-terminus of Glis3 and the homeodomain of HNF6 are critical for this interaction, suggesting cooperative regulation of Ngn3 expression.\",\n      \"method\": \"Chromatin immunoprecipitation (binding to Ngn3 promoter), luciferase reporter assay, co-immunoprecipitation, in vitro protein interaction assays\",\n      \"journal\": \"Molecules and cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP in vivo plus in vitro binding assay and reporter assay, single lab\",\n      \"pmids\": [\"22820919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HNF-6 regulates in spinal motor neurons the expression of agrin, neuregulin-2, and TGF-β receptor II, which are required for neuromuscular junction formation; Hnf6 mutant mice have abnormal NMJ morphology and defective synaptophysin localization, and defects in NMJ-like co-culture structures are rescued by recombinant agrin and neuregulin.\",\n      \"method\": \"Hnf6 mutant mouse analysis (histology, behavioral tests), gene expression analysis, spinal cord slice/myotube co-culture with recombinant factor rescue\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KO phenotyping combined with rescue experiment in co-culture, multiple orthogonal methods\",\n      \"pmids\": [\"23227180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Onecut1 (Oc1) is required for horizontal cell (HC) genesis in the retina: ~80% of HCs fail to form in retina-specific Oc1 KO mice. Epistasis analysis places Oc1 downstream of FoxN4, in parallel with Ptf1a, and upstream of Lim1 and Prox1. Oc1 and Ptf1a together are sufficient (in utero electroporation) to determine HC fate.\",\n      \"method\": \"Retina-specific Oc1 knockout, in utero electroporation for gain-of-function, genetic epistasis analysis with multiple TF mutants\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO phenotyping plus gain-of-function electroporation and genetic epistasis, multiple orthogonal methods\",\n      \"pmids\": [\"23926259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Onecut1 is sufficient to induce cells with earliest markers of cones and horizontal cells; interference with Onecut1 transcriptional activity leads to precocious rod development. A cis-regulatory module (ThrbCRM1) for the Thrb gene is combinatorially regulated by Otx2 and Onecut1, placing Onecut1 in control of cone vs. rod photoreceptor fate.\",\n      \"method\": \"Retinal electroporation for gain- and dominant-negative loss-of-function, cis-regulatory element analysis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function and dominant-negative loss-of-function with CRM analysis, multiple orthogonal experiments\",\n      \"pmids\": [\"23867227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Let-7b and miR-495 repress HNF6 in pancreatic acinar cells; inhibition of these miRNAs (or Dicer inactivation) leads to HNF6 induction, repression of acinar differentiation, and induction of hepatic genes. Overexpression of HNF6 alone in developing acinar cells is sufficient to repress acinar differentiation. The Dicer-deficient acinar phenotype depends on HNF6 induction (epistasis in Dicer/Hnf6 double-KO).\",\n      \"method\": \"Pancreas/acinar-specific Dicer KO mice, Dicer/Hnf6 double-KO epistasis, miRNA mimic/inhibitor transfection in acinar cells\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic epistasis (double KO), gain-of-function, and miRNA modulation, multiple orthogonal methods\",\n      \"pmids\": [\"23684747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Onecut1 and Onecut2 act redundantly in retinal development: double-null mice show complete absence of HCs, reduced RGC production, failed starburst amacrine cell genesis, and compromised cone generation. RNA-Seq identified downstream targets, confirming redundancy and showing that onecut factors suppress rod fate, contributing to retinal progenitor competence for early cell fates.\",\n      \"method\": \"Oc1/Oc2 double-knockout mice, RNA-Seq expression profiling, retinal cell type quantification\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double-KO mouse phenotyping with RNA-Seq downstream target identification, multiple orthogonal approaches\",\n      \"pmids\": [\"25228773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CUX2 competes with HNF6 for DNA binding at shared genomic binding sites in liver chromatin; in cell-based assays, CUX2 inhibits HNF6 transcriptional regulation of sex-specific gene promoters (CYP2C11, CYP2C12). ChIP-seq identified ~40,000 HNF6-binding sites in mouse liver, with ~90% of CUX2 binding sites co-occupied by HNF6.\",\n      \"method\": \"Cell-based transfection reporter assays, in vitro EMSA, ChIP-seq (HNF6 cistrome mapping)\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genome-wide ChIP-seq cistrome mapping, EMSA competition, and reporter assays, multiple orthogonal methods\",\n      \"pmids\": [\"26218442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Onecut1 and Onecut2 operate downstream of Pax6 in retinal development to maintain horizontal cells; in Pax6-deficient retinas, Onecut1/2 expression is lost, and compound Onecut1/2 mutants show complete loss of HCs. Genes for HC development (Foxn4, Ptf1a, Prox1, Lim1) show that HCs are initially formed but not maintained in Onecut-deficient retinas.\",\n      \"method\": \"Single and compound Onecut1/Onecut2 KO mouse analysis, Pax6 conditional KO, immunostaining for HC markers and TF expression\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple KO models with genetic epistasis, replicated across labs\",\n      \"pmids\": [\"25794677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HNF6 acts as a transcriptional repressor of lipogenic genes in adult liver: liver-specific deletion of HNF6 causes hepatic steatosis, upregulates lipogenic genes directly bound by HNF6, and reduces binding of the circadian nuclear receptor Rev-erbα at these sites, revealing a novel mechanism by which HNF6 represses lipid metabolism genes and facilitates Rev-erbα occupancy.\",\n      \"method\": \"Adult liver-specific HNF6 deletion (Cre-lox), RNA-seq/gene expression, ChIP-seq for HNF6 and Rev-erbα binding\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in vivo combined with ChIP-seq mapping of HNF6 and Rev-erbα co-occupancy, multiple orthogonal methods\",\n      \"pmids\": [\"27445394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GH mediates its hepatoprotective effect against apoptosis through HNF6; GH-mediated suppression of caspase-3/-8/-9 and hepatic apoptosis during bile duct ligation is abrogated in Hnf6 conditional KO mice. ChIP and EMSA identified Ciap1 (Birc2) as a direct HNF6 target gene mediating this anti-apoptotic effect.\",\n      \"method\": \"Hnf6 conditional KO mouse model, bile duct ligation, primary hepatocyte cultures, ChIP-on-chip and EMSA\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in vivo with ChIP and EMSA identifying a direct target, multiple orthogonal methods\",\n      \"pmids\": [\"27936029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Oc1 (HNF6) is a direct transcriptional regulator of pancreatic exocrine (acinar) differentiation: ChIP-seq in embryonic pancreas identified ~1000 direct Oc1 target genes including acinar regulatory factors (Nr5a2, Ptf1a, Gata4, Mist1) and functional genes (Amylase, Cpa1, Prss1, Spink1), as well as ductal factors Hnf1β and FoxA2.\",\n      \"method\": \"ChIP-seq (direct target identification), RNA-seq on Oc1-deficient pancreas, immunofluorescence validation\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP-seq for direct binding combined with RNA-seq and protein-level validation in a single focused study\",\n      \"pmids\": [\"30831323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss of ONECUT1 in human pluripotent stem cell differentiation impairs pancreatic progenitor formation and endocrine program. ONECUT1 loss alters transcription factor binding, enhancer activity, and NKX2.2/NKX6.1 expression in pancreatic progenitors, establishing ONECUT1 as a regulator of transcriptional and epigenetic machinery in endocrine development.\",\n      \"method\": \"hPSC directed differentiation with ONECUT1 loss-of-function, ChIP-seq, ATAC-seq, RNA-seq\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multi-omic analysis (ChIP-seq, ATAC-seq, RNA-seq) in human stem cell model, multiple orthogonal methods in a rigorous study\",\n      \"pmids\": [\"34663987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Stage-specific RNA-seq, ChIP-seq, and ATAC-seq during hPSC pancreatic differentiation identify ONECUT1 as a crucial fate regulator in pancreas progenitors that prepares progenitors for later endocrine specification, acting within a transcriptional and epigenetic regulatory circuitry.\",\n      \"method\": \"RNA-seq, ChIP-seq, ATAC-seq during hPSC pancreatic differentiation\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multi-omic approach (RNA-seq, ChIP-seq, ATAC-seq), multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"34789845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A long-range enhancer ~664 kb from the ONECUT1 promoter (ONECUT1e-664kb) is required for ONECUT1 expression during pancreatic differentiation; homozygous deletion of this enhancer in hPSCs causes near-complete loss of ONECUT1 expression and impaired pancreatic differentiation. A T2D-associated variant (rs528350911) in this enhancer disrupts a GATA motif and reduces binding of GATA4, GATA6, and FOXA2.\",\n      \"method\": \"CRISPRi screen in hPSC pancreatic differentiation, homozygous enhancer deletion, ChIP for TF binding at risk variant, hPSC differentiation assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — CRISPRi screen, homozygous deletion, ChIP validation, multiple orthogonal methods in a focused study\",\n      \"pmids\": [\"39163202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ONECUT1 transcriptionally activates PSAT1 by directly binding to the PSAT1 promoter, as confirmed by ChIP and dual luciferase assays; ONECUT1 overexpression in lung squamous cell carcinoma cells restores PSAT1-mediated upregulation of PD-L1 expression and immune evasion.\",\n      \"method\": \"ChIP assay, dual luciferase reporter assay, overexpression/knockdown experiments, flow cytometry, co-culture assays\",\n      \"journal\": \"Tissue & cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP and luciferase assays in a single cancer cell line study, single lab\",\n      \"pmids\": [\"40907151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ONECUT1 functions as a tumor suppressor downstream of activated β-Catenin in hepatoblastoma; β-Catenin activation suppresses ONECUT1 expression, and co-expression of ONECUT1 with YAP/β-Catenin strongly suppresses hepatoblastoma formation. ONECUT1 negatively regulates tumor cell glycolysis and reshapes the tumor immune microenvironment.\",\n      \"method\": \"Inducible transposon-based murine HB model, doxycycline-inducible ONECUT1 expression, transcriptomic analysis, T cell depletion experiments\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo murine model with inducible expression and transcriptomic analysis plus immune depletion, two orthogonal in vivo approaches\",\n      \"pmids\": [\"39999468\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ONECUT1/HNF-6 is a bipartite DNA-binding transcription factor (single cut domain + homeodomain, structurally resolved by X-ray crystallography) that acts as a direct transcriptional activator of key developmental genes (HNF-3β, HNF-4, HNF1β, Pdx1, Ngn3, Glut-2, CYP7A1, Ciap1, acinar genes) and, in adult liver, also as a transcriptional repressor of lipogenic genes; it interacts with multiple co-regulators (FoxA2, C/EBPα, CBP/p300, SHP, CUX2, Glis3) to modulate its activity, is controlled upstream by GH via STAT5/HNF-4 at its promoter and by vHNF1/TCF2 via an intronic enhancer, is post-transcriptionally repressed by miR-495 and miR-218, and is essential in vivo for biliary tract morphogenesis (via an HNF6→HNF1β cascade), pancreas specification and endocrine differentiation, retinal horizontal cell genesis (positioned downstream of FoxN4, upstream of Lim1/Prox1), neuromuscular junction formation in motor neurons, and hepatic lipid homeostasis in adults.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ONECUT1 (HNF-6) is a bipartite cut-homeodomain transcription factor whose single cut domain and homeodomain together recognize DNA, with X-ray crystallography of the domain bound to a transthyretin-promoter site defining the recognition mechanism that underlies its dual mode of activation [#14]. As a direct activator it binds and stimulates promoters of a hepatic/endoderm transcription-factor network, including HNF-3\\u03b2, HNF-4, the protein C gene, Glut-2, Pdx1, Ngn3, Hnf1\\u03b2 and CYP7A1 [#0, #1, #2, #5, #6, #7, #9, #17], positioning it at the apex of cascades that drive biliary tract morphogenesis (an HNF6\\u2192HNF1\\u03b2 cascade) and pancreas specification and endocrine differentiation [#5, #7, #17]. Its activity is tuned by physical partners: it acts as a coactivator that synergizes with FoxA2 and recruits p300/CBP through an LXXLL motif in the cut domain [#8], cooperates with C/EBP\\u03b1 to recruit CBP [#12] and Glis3 at the Ngn3 promoter [#20], while CUX2, SHP (NR0B2) and elevated FoxA2 antagonize it by competing for or inhibiting DNA binding [#8, #16, #26]. Upstream, growth hormone induces hnf6 transcription via STAT5 and HNF-4 at the promoter [#3], vHNF1/TCF2 acts through an intronic enhancer [#13], and miR-495/miR-218/let-7b repress it post-transcriptionally [#18, #24]; a long-range enhancer ~664 kb away carrying a T2D-associated GATA-disrupting variant is required for its pancreatic expression [#33]. In adult liver ONECUT1 switches to a repressor of lipogenic genes, facilitating Rev-erb\\u03b1 occupancy, such that its loss causes hepatic steatosis [#28]. Beyond endoderm it directs retinal horizontal-cell and cone fate downstream of FoxN4/Pax6 and upstream of Lim1/Prox1, acting redundantly with Onecut2 [#22, #23, #25, #27], and regulates motor-neuron genes (agrin, neuregulin-2) required for neuromuscular junction formation [#21].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established the core identity of HNF-6 as a cut-homeodomain DNA-binding transcription factor and placed it upstream of other liver transcription factors, answering what kind of molecule it is and where it sits in a regulatory hierarchy.\",\n      \"evidence\": \"Yeast one-hybrid cDNA isolation and cotransfection reporter assays on HNF-3\\u03b2, TTR and HNF-4 promoters in hepatic cells\",\n      \"pmids\": [\"9441664\", \"9441665\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct in vivo binding to endogenous targets not yet shown\", \"No structural basis for DNA recognition\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated direct, sequence-specific transcriptional activation by HNF-6 at a defined promoter, converting the inferred activator role into a mutation-validated mechanism.\",\n      \"evidence\": \"EMSA, site-directed mutagenesis (-14 T\\u2192C) and reporter assays on the protein C gene promoter\",\n      \"pmids\": [\"9553065\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Single target gene\", \"No genome-wide binding map\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined upstream control of hnf6 by growth hormone and revealed gain-of-function consequences, showing both how the factor is regulated and that its levels must be temporally limited for normal islet function.\",\n      \"evidence\": \"EMSA and promoter mutagenesis with in vivo GH treatment of hypophysectomized rats; pdx1(PB)-HNF6 transgenic mice with histology and glucose challenge\",\n      \"pmids\": [\"10674400\", \"10851133\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Mechanism of timed downregulation in endocrine cells not defined\", \"Direct STAT5/HNF-4 cooperativity at the promoter not structurally resolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Established in vivo developmental requirement for HNF-6 in biliary morphogenesis via a direct HNF6\\u2192HNF1\\u03b2 cascade and confirmed direct Glut-2 activation, linking the factor to organ development and hepatic glucose handling.\",\n      \"evidence\": \"Hnf6\\u2212/\\u2212 mouse phenotyping with promoter-reporter assays and immunostaining; in vivo adenoviral co-infection and DNA binding for Glut-2\",\n      \"pmids\": [\"11934848\", \"11915024\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Full set of biliary effectors downstream of HNF1\\u03b2 not enumerated\", \"Intrahepatic vs extrahepatic duct mechanism differences unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Positioned HNF-6 as a direct upstream timing regulator of pancreas specification and uncovered a partner-based mechanism for tuning its activity through FoxA2 and p300/CBP recruitment.\",\n      \"evidence\": \"Hnf6\\u2212/\\u2212 embryo analysis with Pdx1 promoter assays; protein-binding, LXXLL mutagenesis, DNA binding and cotransfection for FoxA2 interaction\",\n      \"pmids\": [\"12781686\", \"12509444\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Quantitative balance between coactivation and FoxA2-mediated inhibition in vivo unclear\", \"Structural detail of the cut-homeodomain/winged-helix interface not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Expanded the target repertoire (CYP7A1, HNF4\\u03b1 P2 promoter) and revealed indirect regulation via TGF-\\u03b2 suppression, broadening HNF-6 from a simple activator to a network hub with both direct and indirect outputs.\",\n      \"evidence\": \"Promoter mutagenesis with in vivo adenoviral/GH validation (CYP7A1); double-KO mice and transgenesis (HNF4\\u03b1 P2); Hnf6\\u2212/\\u2212 cells with TGF-\\u03b2 inhibition (Foxa1)\",\n      \"pmids\": [\"15349898\", \"15159395\", \"15562441\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct vs indirect contributions to bile acid homeostasis not separated\", \"Mechanism linking HNF-6 loss to TGF-\\u03b2RII upregulation unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined a C/EBP\\u03b1\\u2013HNF-6\\u2013CBP coactivation complex confirmed in vivo and showed vHNF1/TCF2 acts through an intronic enhancer upstream of HNF6, mapping both protein-complex and cis-regulatory inputs.\",\n      \"evidence\": \"Cotransfection, reciprocal co-IP from liver extracts and ChIP for C/EBP\\u03b1; EMSA, footprinting, endoderm electroporation, transgenesis and gene inactivation for vHNF1\",\n      \"pmids\": [\"16440369\", \"16380477\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Stoichiometry and structure of the HNF-6/C/EBP\\u03b1/CBP complex unknown\", \"Other inputs into the intronic enhancer not characterized\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved the crystal structure of the bipartite cut-homeodomain bound to DNA, providing the structural basis for sequence recognition and context-dependent dual activation.\",\n      \"evidence\": \"X-ray crystallography of the HNF-6\\u03b1 cut+homeodomain complexed with the TTR promoter site; double-KO mouse analysis of hepatoblast migration\",\n      \"pmids\": [\"17223534\", \"17936262\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Structure of full-length protein with coactivators not solved\", \"Basal-lamina degradation effectors only partly mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified SHP (NR0B2) as a repressor that inhibits HNF-6 DNA binding, adding a nuclear-receptor brake on gluconeogenic target genes G6Pase and PEPCK.\",\n      \"evidence\": \"Cotransfection, protein-binding, EMSA, ChIP, confocal microscopy and adenoviral SHP/siRNA experiments\",\n      \"pmids\": [\"18459945\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Physiological conditions triggering SHP-mediated repression not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established HNF6 as a direct activator of the pro-endocrine gene Ngn3 required for progenitor entry into the endocrine lineage, and identified miRNA control of its mRNA.\",\n      \"evidence\": \"Conditional Cre-lox inactivation and Ngn3 promoter assays; miR-495/miR-218 3'UTR reporter and endogenous mRNA quantification\",\n      \"pmids\": [\"19766716\", \"19913497\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"In vivo relevance of miR-495/miR-218 regulation not tested\", \"Co-factor requirements at the Ngn3 promoter not yet defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked HNF6 to acinar-to-ductal metaplasia and identified Glis3 as a cooperative partner at Ngn3, refining how HNF6 toggles between acinar repression and ductal/endocrine programs.\",\n      \"evidence\": \"Gain/loss-of-function in cells and mouse ADM models with human tissue staining; ChIP, luciferase, co-IP and in vitro binding for Glis3; NMJ analysis in Hnf6 mutant mice with co-culture rescue\",\n      \"pmids\": [\"22271799\", \"22820919\", \"23227180\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct vs indirect acinar gene repression targets not all defined\", \"Mechanism of motor-neuron target selection unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined ONECUT1's role in retinal fate determination (horizontal and cone cells, suppression of rod fate) and demonstrated miRNA-enforced repression maintains acinar identity, with HNF6 induction sufficient to derail it.\",\n      \"evidence\": \"Retina-specific KO, in utero/retinal electroporation and ThrbCRM1 cis-regulatory analysis; pancreas/acinar Dicer KO, Dicer/Hnf6 double-KO epistasis and miRNA modulation\",\n      \"pmids\": [\"23926259\", \"23867227\", \"23684747\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Combinatorial logic with Otx2/Ptf1a at cis-regulatory modules incompletely mapped\", \"In vivo miRNA contribution to acinar identity quantitatively unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated functional redundancy with Onecut2 in retina, showing the two factors jointly confer progenitor competence for early cell fates and suppress rod fate.\",\n      \"evidence\": \"Oc1/Oc2 double-knockout mice with RNA-Seq target identification and cell-type quantification\",\n      \"pmids\": [\"25228773\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct vs indirect status of RNA-Seq targets not fully resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Mapped the genome-wide HNF6 cistrome (~40,000 sites) and revealed CUX2 competition at shared sex-specific gene loci, plus Pax6-dependent maintenance of Onecut expression in horizontal cells.\",\n      \"evidence\": \"ChIP-seq cistrome mapping, EMSA competition and reporter assays (CUX2); single/compound Onecut and Pax6 KO with marker immunostaining\",\n      \"pmids\": [\"26218442\", \"25794677\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Determinants of activator vs repressor outcome at cistrome-wide sites not defined\", \"How Pax6 maintains Onecut expression mechanistically unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed HNF6's adult-liver function as a repressor of lipogenic genes that facilitates Rev-erb\\u03b1 occupancy, and as a GH-dependent anti-apoptotic factor acting through direct target Ciap1.\",\n      \"evidence\": \"Adult liver-specific deletion with RNA-seq and ChIP-seq for HNF6/Rev-erb\\u03b1; Hnf6 conditional KO with bile duct ligation, ChIP-on-chip and EMSA for Ciap1\",\n      \"pmids\": [\"27445394\", \"27936029\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Molecular switch between activator and repressor modes in liver not defined\", \"Direct interaction with Rev-erb\\u03b1 not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Genome-wide direct target mapping in embryonic pancreas established ONECUT1 as a direct regulator of both acinar and ductal gene programs, anchoring its exocrine differentiation role.\",\n      \"evidence\": \"ChIP-seq direct target identification, RNA-seq on Oc1-deficient pancreas and immunofluorescence validation\",\n      \"pmids\": [\"30831323\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Logic determining acinar vs ductal target output not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Human pluripotent stem cell models established ONECUT1 as a regulator of transcriptional and epigenetic machinery preparing pancreatic progenitors for endocrine specification, translating mouse findings to human development.\",\n      \"evidence\": \"hPSC directed differentiation with loss-of-function, ChIP-seq, ATAC-seq and RNA-seq across stages\",\n      \"pmids\": [\"34663987\", \"34789845\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct vs indirect control of enhancer accessibility not separated\", \"Causal chain to NKX2.2/NKX6.1 not fully mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified a required long-range enhancer ~664 kb upstream and a T2D-associated variant disrupting GATA binding, connecting ONECUT1 cis-regulation to disease risk.\",\n      \"evidence\": \"CRISPRi screen in hPSC pancreatic differentiation, homozygous enhancer deletion and ChIP for GATA4/GATA6/FOXA2 at the risk variant\",\n      \"pmids\": [\"39163202\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Population-level penetrance of the variant not addressed\", \"3D chromatin contact between enhancer and promoter not directly demonstrated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended ONECUT1 into cancer contexts as a regulator of metabolism and immune evasion, acting as a PSAT1 activator in lung squamous carcinoma and a tumor suppressor downstream of \\u03b2-Catenin in hepatoblastoma.\",\n      \"evidence\": \"ChIP and luciferase assays with overexpression/knockdown and co-culture in LUSC cells; inducible transposon murine hepatoblastoma model with transcriptomics and T cell depletion\",\n      \"pmids\": [\"40907151\", \"39999468\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Single cancer cell line for PSAT1 mechanism\", \"Whether tumor-suppressive effect is cell-autonomous vs immune-mediated not fully separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular switch that determines whether ONECUT1 acts as an activator or repressor at a given genomic site, and how its cofactor and chromatin context dictate context-specific outputs across endoderm, retina, motor neurons and tumors, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No structural model of activator vs repressor cofactor complexes\", \"Determinants of tissue-specific target selection not defined\", \"Mechanistic basis for Rev-erb\\u03b1 facilitation not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 2, 14, 28, 30]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 14, 26]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [8, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 2, 30]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 7, 22, 25, 31]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [28, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FOXA2\", \"CEBPA\", \"CUX2\", \"NR0B2\", \"GLIS3\", \"CREBBP\", \"EP300\", \"NR1D1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":5,"faith_total":6,"faith_pct":83.33333333333333}}