{"gene":"HIC1","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":2005,"finding":"HIC1 forms a transcriptional repression complex with SIRT1 deacetylase that directly binds the SIRT1 promoter and represses its transcription; inactivation of HIC1 results in upregulated SIRT1 expression, leading to deacetylation and inactivation of p53, allowing cells to bypass apoptosis after DNA damage.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), promoter reporter assays, siRNA knockdown with apoptosis readout","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, ChIP, functional rescue experiments; independently replicated across multiple subsequent studies","pmids":["16269335"],"is_preprint":false},{"year":1995,"finding":"HIC1 is activated transcriptionally by wild-type p53 (p53 binding site identified in the 5' flanking region) and suppresses colony formation in brain, breast, and colon cancer cells when inserted exogenously, establishing it as a p53-regulated tumor suppressor.","method":"p53 expression vector transfection with RT-PCR for HIC1 expression, colony suppression assay, sequence analysis of p53 binding site","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (functional p53 transactivation, colony suppression), replicated by subsequent studies","pmids":["7585125"],"is_preprint":false},{"year":2007,"finding":"HIC1 represses SIRT1 transcription through a metabolically regulated complex with the redox sensor CtBP; treatment with the glycolytic blocker 2-deoxyglucose decreases CtBP association with HIC1, thereby de-repressing SIRT1 expression in response to nutrient deprivation.","method":"Co-immunoprecipitation, promoter reporter assays, pharmacological treatment (2-deoxyglucose)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional reporter assays in single lab with two orthogonal methods","pmids":["17213307"],"is_preprint":false},{"year":2007,"finding":"HIC1 is SUMOylated in vivo on lysine K314; this SUMOylation positively controls HIC1 transcriptional repression activity. HIC1 is also acetylated in vitro by P300/CBP on K314, creating a competitive acetylation/SUMOylation switch. SIRT1 and HDAC4 deacetylate K314 to favor SUMOylation; SIRT1 knockdown reduces HIC1 SUMOylation.","method":"In vivo SUMOylation assay, in vitro acetylation assay with P300/CBP, site-directed mutagenesis (K314R, E316A, P317A), siRNA knockdown of SIRT1, transfection reporter assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assays, mutagenesis, and siRNA rescue in single lab with multiple orthogonal methods","pmids":["17283066"],"is_preprint":false},{"year":2002,"finding":"HIC1 interacts with CtBP corepressor through a conserved GLDLSKK motif (a variant of the PxDLSxK/R CtBP interaction motif); BTB/POZ domain dimerization is required for this interaction. HIC1 mediates transcriptional repression via both HDAC-independent (BTB/POZ) and HDAC-dependent (CtBP-dependent) mechanisms.","method":"In vivo and in vitro Co-immunoprecipitation, mammalian two-hybrid, Gal4 fusion reporter assays, trichostatin A sensitivity assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro and in vivo binding assays plus functional reporter assays with mutagenesis in single lab","pmids":["12052894"],"is_preprint":false},{"year":1999,"finding":"The BTB/POZ domain of HIC1 acts as an autonomous transcriptional repression domain but, unlike BCL-6 and PLZF, does not recruit SMRT/N-CoR, mSin3A, or HDAC-1 complexes in vivo or in vitro, and HIC1-mediated repression is not alleviated by the HDAC inhibitor trichostatin A.","method":"Mammalian two-hybrid, in vivo and in vitro Co-immunoprecipitation, trichostatin A treatment with reporter assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal methods (Co-IP in vivo and in vitro, pharmacological inhibitor, reporter), single lab","pmids":["10611298"],"is_preprint":false},{"year":2004,"finding":"HIC1 binds the consensus DNA sequence 5'-(C/G)NG(C/G)GGGCA(C/A)CC-3' (GGCA core motif bound by zinc fingers 3 and 4); the BTB/POZ domain inhibits binding to a single site but mediates cooperative binding to multiple concatemerized sites. Endogenous HIC1 represses transcription through direct binding to these sites, confirmed by ChIP.","method":"SELEX (selection and amplification of binding sites), electrophoretic mobility shift assay (EMSA), chromatin immunoprecipitation (ChIP), luciferase reporter assays, deletion/mutagenesis analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — SELEX, EMSA, ChIP, and reporter assays in single lab with multiple orthogonal methods","pmids":["15231840"],"is_preprint":false},{"year":2006,"finding":"HIC1 antagonizes TCF/beta-catenin-mediated transcription in Wnt-stimulated cells by associating with TCF-4 and recruiting TCF-4 and beta-catenin to HIC1 nuclear bodies, preventing their association with TCF-binding elements on Wnt-responsive gene promoters.","method":"Co-immunoprecipitation, immunofluorescence/confocal microscopy (nuclear body co-localization), luciferase reporter assays for Wnt-responsive transcription","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, live-cell imaging of nuclear bodies, functional reporter assays; single lab, two orthogonal methods","pmids":["16724116"],"is_preprint":false},{"year":2008,"finding":"HIC1 is a direct transcriptional repressor of ATOH1 (Atonal Homolog 1); loss of HIC1 in mouse GCPs leads to increased ATOH1 expression, and compound Ptch1/Hic1 heterozygotes show fourfold increased medulloblastoma incidence compared with Ptch1 heterozygotes alone.","method":"Chromatin immunoprecipitation (ChIP), luciferase reporter assays, mouse genetic epistasis (compound heterozygotes), in vitro growth assays with ATOH1 knockdown","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP, reporter assays, and in vivo mouse genetic epistasis in single study; replicated in cochlea study (PMID 33770497)","pmids":["18347096"],"is_preprint":false},{"year":2009,"finding":"CXCR7 is a direct transcriptional target gene of HIC1; endogenous HIC1 binds the CXCR7 promoter together with CtBP corepressor; siRNA knockdown of HIC1 in WI38 fibroblasts upregulates CXCR7.","method":"Genome-wide expression profiling, quantitative RT-PCR, luciferase reporter/promoter deletion assays, ChIP and sequential ChIP (ChIP-on-ChIP), siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP, sequential ChIP, reporter assays, and siRNA knockdown; multiple orthogonal methods in single lab","pmids":["19525223"],"is_preprint":false},{"year":2009,"finding":"HIC1 interacts with and represses ARID1A/BAF250A-containing SWI/SNF complexes; Co-IP in WI38 fibroblasts and BRG1-/- SW13 cells showed that endogenous HIC1 and ARID1A interact in a BRG1-dependent manner; sequential ChIP demonstrated HIC1 represses E2F1 via recruitment of ARID1A-containing SWI/SNF complexes. HIC1 does not interact with BRM.","method":"Yeast two-hybrid, co-immunoprecipitation (reciprocal, in BRG1-/- cells), sequential ChIP (ChIP-reChIP)","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid, reciprocal Co-IP, and ChIP-reChIP; single lab, three complementary methods","pmids":["19486893"],"is_preprint":false},{"year":2010,"finding":"HIC1 interacts with MTA1 (a subunit of the NuRD complex) as a new corepressor; this interaction is regulated by competitive posttranslational modifications at K314 (SUMOylation promotes, acetylation inhibits). HIC1/MTA1 complexes bind Cyclin D1 and p57KIP2 promoters in quiescent cells; HIC1/MTA1 and HIC1/CtBP complexes differentially occupy distinct HIC1-responsive elements on the SIRT1 promoter.","method":"Yeast two-hybrid, co-immunoprecipitation, chromatin immunoprecipitation (ChIP), sequential ChIP","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid, Co-IP, ChIP, and sequential ChIP; multiple orthogonal methods in single lab","pmids":["20547755"],"is_preprint":false},{"year":2010,"finding":"HIC1 is a direct transcriptional repressor of ephrin-A1; mouse embryos lacking both Hic1 alleles show developmental defects spatially associated with ephrin-A1 misexpression; re-expression of HIC1 in breast cancer cells reduces tumor growth, partially rescued by ephrin-A1 co-overexpression.","method":"ChIP, luciferase reporter assays, mouse knockout/heterozygote in vivo model, in vivo tumor growth rescue experiment","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assays plus in vivo mouse genetic validation; single lab","pmids":["20154726"],"is_preprint":false},{"year":2011,"finding":"EphA2 is a direct transcriptional target gene of HIC1; endogenous HIC1 proteins are bound together with MTA1 corepressor to the EphA2 promoter in WI38 cells; siRNA knockdown of HIC1 in normal breast epithelial cells upregulates EphA2 and increases cellular migration.","method":"Chromatin immunoprecipitation (ChIP), sequential ChIP, RT-PCR and Western blot, siRNA knockdown with migration assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, sequential ChIP, and functional siRNA knockdown; single lab, multiple methods","pmids":["22184117"],"is_preprint":false},{"year":2011,"finding":"HIC1 is a direct transcriptional repressor of the β-2 adrenergic receptor (ADRB2); agonist-mediated stimulation of ADRB2 increases migration and invasion of breast cancer cells, effects abolished by HIC1 re-expression or siRNA-mediated ADRB2 knockdown.","method":"Promoter luciferase assay, ChIP, sequential ChIP, siRNA knockdown, migration and invasion assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, sequential ChIP, functional siRNA rescue; single lab","pmids":["22194601"],"is_preprint":false},{"year":2012,"finding":"HIC1 interacts with Polycomb-like proteins hPCL3 and PHF1 to form a stable complex with PRC2 members EZH2, EED, and Suz12; this complex represses HIC1 target genes including ATOH1; HIC1 siRNA knockdown leads to partial displacement of EZH2 from the ATOH1 promoter.","method":"Yeast two-hybrid, co-immunoprecipitation, ChIP, siRNA knockdown, in vivo mouse cerebellar developmental model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid, Co-IP, ChIP, and in vivo validation; multiple orthogonal methods in single lab","pmids":["22315224"],"is_preprint":false},{"year":2013,"finding":"DNA double-strand breaks activate HIC1 SUMOylation on K314 through a mechanism involving enhanced HDAC4/Ubc9 interaction, SUMOylation of SIRT1 (Lys-734), and SUMO-dependent recruitment of HDAC4 by SIRT1. This deacetylation/SUMOylation switch of HIC1 favors HIC1/MTA1 interaction and promotes DNA repair. Wild-type but not non-SUMOylatable HIC1 mutants reduce γH2AX foci after etoposide treatment.","method":"Co-immunoprecipitation, in vivo SUMOylation assay, γH2AX foci assay (immunofluorescence), etoposide DNA damage model, siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, functional DNA repair assay, mutagenesis validation; single lab","pmids":["23417673"],"is_preprint":false},{"year":2008,"finding":"HIC1 recruits BRG1, the ATPase subunit of SWI/SNF chromatin-remodeling complexes, to E2F-responsive gene promoters to repress their transcription; HIC1-mediated transcriptional repression of E2F-responsive genes is dependent on BRG1 activity.","method":"ChIP, reporter assays, co-immunoprecipitation, BRG1-deficient cell lines","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, Co-IP, reporter assays, genetic (BRG1-null cells); single lab","pmids":["19015639"],"is_preprint":false},{"year":2004,"finding":"HIC1 is O-GlcNAc glycosylated in vivo and in vitro at three major sites preferentially in the DNA-binding domain; O-GlcNAc modification does not affect the specific DNA-binding activity of full-length HIC1, but in BTB/POZ-deleted N-terminal truncations, glycosylation of the C-terminal tail (residues 670-711) abolishes DNA binding.","method":"In vivo and in vitro O-GlcNAc labeling, wheat germ agglutinin affinity purification, EMSA, C-terminal deletion mutants","journal":"European journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assay plus in vivo labeling and EMSA; single lab, multiple orthogonal methods","pmids":["15373830"],"is_preprint":false},{"year":2006,"finding":"The L225A mutation in the HIC1 GLDLSKK motif abolishes interaction with CtBP1 and CtBP2; the CtBP interaction is stimulated by agents that increase NADH levels; loss of CtBP interaction impairs HIC1-mediated transcriptional repression.","method":"Point mutagenesis, co-immunoprecipitation, NADH/redox modulation assays, reporter transcription assays","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis, Co-IP, and functional reporter; single lab, two orthogonal methods","pmids":["16762039"],"is_preprint":false},{"year":2012,"finding":"HIC1 forms complexes with STAT3 through interaction of the HIC1 C-terminal domain with the STAT3 DNA-binding domain; HIC1 overexpression or depletion respectively decreases or increases IL-6/OSM-induced STAT3 target gene expression (VEGF, c-Myc); HIC1 suppresses STAT3 binding to target gene promoters.","method":"Affinity capture followed by mass spectrometry, co-immunoprecipitation, luciferase reporter assays, ChIP, domain mapping, HIC1 mutant defective in STAT3 interaction","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mass spectrometry identification, Co-IP, ChIP, and reporter assays; single lab, multiple methods","pmids":["24067369"],"is_preprint":false},{"year":2012,"finding":"SIRT1 interacts with the BTB/POZ domain of HIC1; the amino acids 610-677 of SIRT1 (ESA region) are essential for the HIC1/SIRT1 interaction and HIC1 deacetylation; CKII-mediated phosphorylation of SIRT1 serine 659/661 (occurring upon DNA damage) is required for this interaction.","method":"Co-immunoprecipitation with deletion/domain mapping, site-directed mutagenesis, kinase assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping by Co-IP and mutagenesis; single lab, biochemical dissection","pmids":["22510409"],"is_preprint":false},{"year":2015,"finding":"HIC1 directly represses TLR2 transcription; ChIP shows HIC1 association with TLR2 gene regulatory elements; Hic1-deficient MEFs and intestinal organoids show increased TLR2, and Hic1 deficiency promotes NF-κB pathway activity and increases colonic tumor size in chemical carcinogenesis models.","method":"Chromatin immunoprecipitation (ChIP), conditional Cre/loxP knockout, qRT-PCR, intestinal organoid culture, in vivo carcinogenesis model","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and genetic knockout with in vivo tumor model; single lab, two orthogonal methods","pmids":["25934696"],"is_preprint":false},{"year":2013,"finding":"HIC1 directly represses p21 (CIP1/WAF1) transcription; ChIP demonstrates HIC1 occupancy on the p21 promoter; siRNA knockdown of HIC1 in BJ-Tert fibroblasts upregulates p21 and potentiates p21 response to etoposide-induced DNA damage.","method":"Luciferase promoter reporter assay, ChIP, siRNA knockdown, Western blot","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter and siRNA functional assays; single lab","pmids":["23178572"],"is_preprint":false},{"year":2017,"finding":"HIC1 SUMOylation is dispensable for DNA repair (non-SUMOylatable E316A mutant repairs DSBs as efficiently as wt HIC1 in Comet assays) but is essential for the apoptotic transcriptional response to irreparable DSBs; irreparable DSBs (but not repairable ones) increase HIC1 SUMOylation and its interaction with MTA1/MTA3 and their binding to the SIRT1 promoter via an ATM-dependent (Chk2-independent) mechanism.","method":"Comet assay, γH2AX foci assay, Co-immunoprecipitation, ChIP, site-directed mutagenesis (E316A), ATM/Chk2 inhibitors, global expression profiling","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays and mutagenesis in single lab; mechanistically informative negative result for SUMOylation in repair included","pmids":["27935866"],"is_preprint":false},{"year":2016,"finding":"HIC1 physically interacts with CTIP2 (Bcl11b) and HMGA1 to co-regulate cellular genes and repress Tat-dependent HIV-1 transcription; this repression is linked to HIC1 K314 acetylation status and SIRT1 deacetylase activity; HIC1 cooperates with HMGA1 in a TAR-dependent manner to facilitate HIC1/TAT interaction at the viral promoter.","method":"Co-immunoprecipitation, reporter assays, K314 acetylation-status manipulation, SIRT1 activity assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional reporter assays with mutagenesis; single lab","pmids":["27725726"],"is_preprint":false},{"year":2018,"finding":"HIC1 expression in intestinal T cells is regulated by the vitamin A metabolite retinoic acid; HIC1-deficient T cells overproduce IL-17A in vitro and in vivo; T-cell-specific deletion of HIC1 reduces T cell numbers in the intestinal lamina propria and impairs intestinal immune homeostasis.","method":"Conditional T-cell-specific knockout (Cre/loxP), vitamin A-deficient diet model, flow cytometry, in vitro cytokine assays, in vivo infection model","journal":"Mucosal immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional knockout with multiple functional readouts; single lab","pmids":["28327618"],"is_preprint":false},{"year":2018,"finding":"HIC1-deleted breast cancer cells secrete CXCL14, which binds GPR85 on mammary fibroblasts, activating them via ERK1/2, Akt, and neddylation pathways; activated fibroblasts then promote breast cancer progression via CCL17/CCR4-induced EMT.","method":"Conditional mammary-gland-specific Hic1 knockout mouse, cytokine secretion analysis, receptor binding assays, co-culture experiments, signaling pathway inhibition","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional knockout with in vivo model plus mechanistic signaling pathway analysis; single lab","pmids":["30204129"],"is_preprint":false},{"year":2019,"finding":"HIC1 marks quiescent mesenchymal progenitors in skeletal muscle; Hic1 deletion leads to mesenchymal progenitor hyperplasia; single-cell RNA-seq and ATAC-seq reveal multiple subpopulations with distinct functions; Hic1+ MPs contribute to immunomodulation, trophic support, and differentiation into Col22a1-expressing myotendinous junction cells during muscle regeneration.","method":"Conditional knockout (Cre/loxP), single-cell RNA-seq, ATAC-seq, lineage tracing, flow cytometry, histology","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional genetic knockout with multiple high-resolution single-cell methods and lineage tracing; single lab but highly rigorous","pmids":["31809738"],"is_preprint":false},{"year":2020,"finding":"Lineage-specific deletion of HIC1 in cardiac PDGFRa+/SCA-1+ fibro/adipogenic progenitors causes fibrofatty infiltration within the myocardium and drives pathological features of arrhythmogenic cardiomyopathy, demonstrating that HIC1 maintains progenitor quiescence in the heart.","method":"Conditional Cre/loxP knockout (lineage-specific), histology, cardiac function measurement, in vitro differentiation assays","journal":"Cell stem cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional knockout with defined cardiac phenotype; single lab","pmids":["31978365"],"is_preprint":false},{"year":2016,"finding":"HIC1 directly represses IL-6 transcription in non-small cell lung cancer cells through sequence-specific binding to the IL-6 promoter; loss of HIC1 induces autocrine IL-6 secretion that activates STAT3 via JAK pathway, promoting NSCLC invasion and migration.","method":"ChIP, luciferase reporter assay, siRNA knockdown, IL-6 rescue experiment, in vitro and in vivo assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assays plus functional rescue; single lab","pmids":["27107418"],"is_preprint":false},{"year":2021,"finding":"HIC1 represses Atoh1 transcription in cochlear supporting cells; Hic1 knockdown induces Atoh1 expression and promotes hair cell differentiation in cochlear organoids; wild-type HIC1 but not the DNA-binding mutant C521S suppresses the Atoh1 autoregulatory enhancer and blocks its responsiveness to β-catenin activation.","method":"siRNA knockdown and overexpression in cochlear organoids, luciferase reporter assay with Atoh1 enhancer, DNA-binding domain mutant (C521S), qRT-PCR","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional organoid model, mutagenesis, and reporter assays; single lab","pmids":["33770497"],"is_preprint":false},{"year":2020,"finding":"In Xenopus, Hic1 regulates cranial neural crest migration by modulating cadherin expression profiles and canonical Wnt signaling; both overexpression and knockdown of hic1 impair neural crest migration in vivo and in tissue explants without affecting neural crest specification.","method":"Xenopus morpholino knockdown and mRNA overexpression, in vivo neural crest migration assay, tissue explant migration, qRT-PCR for cadherins and Wnt targets","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and ex vivo functional manipulation in Xenopus; single lab","pmids":["32502469"],"is_preprint":false},{"year":2021,"finding":"FBXW11 targets HIC1 for ubiquitination and proteasomal degradation, reducing HIC1 protein stability in colorectal cancer cells; this leads to upregulation of SIRT1 (a direct HIC1 transcriptional target), promoting colorectal cancer stem-cell features and liver metastasis.","method":"Co-immunoprecipitation, ubiquitination assay, Western blot, siRNA knockdown, xenograft mouse model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay with functional in vivo rescue; single lab","pmids":["34642302"],"is_preprint":false},{"year":2023,"finding":"HIC1 directly represses GPX4 transcription in colon cancer cells; HIC1 overexpression augments ferroptotic cell death by reducing GPX4 expression, and HIC1 silencing attenuates ferroptosis and restores GPX4 expression.","method":"HIC1 overexpression/siRNA knockdown, GPX4 promoter reporter assay, glutathione and lipid peroxidation assays, xenograft model","journal":"Free radical biology & medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — reporter assay and functional overexpression/knockdown, but no direct ChIP for HIC1 at GPX4 promoter reported in abstract; single lab","pmids":["37717793"],"is_preprint":false},{"year":2018,"finding":"HIC1 in renal tubular epithelial cells represses SIRT1 transcription by recruiting EZH2 (H3K27 trimethyltransferase) and DNMT1 to the SIRT1 promoter in response to high glucose; this epigenetic repression of SIRT1 by HIC1 contributes to ROS accumulation.","method":"ChIP for H3K27me3 and 5-methylcytosine, Co-immunoprecipitation (HIC1 with EZH2/DNMT1), siRNA knockdown, ROS measurement","journal":"Biochimica et biophysica acta. Gene regulatory mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, Co-IP, and functional siRNA knockdown; single lab, multiple orthogonal methods","pmids":["30496037"],"is_preprint":false}],"current_model":"HIC1 (Hypermethylated in Cancer 1) is a sequence-specific transcriptional repressor that dimerizes via its N-terminal BTB/POZ domain and binds a GC-rich consensus sequence through its C-terminal C2H2 zinc fingers; it recruits multiple corepressor complexes—including CtBP (via a GLDLSKK motif), NuRD/MTA1, SWI/SNF (BRG1/ARID1A), and PRC2 (via hPCL3/PHF1)—to repress direct target genes (including SIRT1, ATOH1, CXCR7, EphA2, ephrin-A1, ADRB2, TLR2, IL-6, GPX4, E2F1, p21, and p57KIP2); HIC1 repressive activity is modulated by a K314 acetylation/SUMOylation switch governed by SIRT1 and HDAC4 deacetylases, with DNA damage-induced CKII-phosphorylation of SIRT1 promoting its interaction with HIC1 to favor SUMOylation and NuRD recruitment; through SIRT1 repression, HIC1 maintains p53 acetylation and apoptotic competence, forming a regulatory feedback loop central to tumor suppression; HIC1 also maintains mesenchymal and tissue-resident progenitor cell quiescence in multiple adult tissues, and regulates immune cell function downstream of retinoic acid signaling."},"narrative":{"mechanistic_narrative":"HIC1 is a sequence-specific transcriptional repressor that functions as a p53-inducible tumor suppressor and an enforcer of progenitor cell quiescence in adult tissues [PMID:7585125, PMID:31809738]. It binds a GC-rich consensus sequence (GGCA core) through its C-terminal C2H2 zinc fingers, with the N-terminal BTB/POZ domain dimerizing and mediating cooperative binding to concatemerized sites [PMID:15231840]. The BTB/POZ domain is an autonomous repression module that, unlike related BTB proteins, does not recruit SMRT/N-CoR or mSin3A/HDAC1 [PMID:10611298]; instead HIC1 represses transcription by recruiting a panel of corepressor machineries—CtBP via a GLDLSKK motif in a redox/NADH-dependent manner [PMID:12052894, PMID:16762039], the NuRD subunit MTA1 [PMID:20547755], ARID1A/BRG1-containing SWI/SNF complexes [PMID:19486893, PMID:19015639], and PRC2 through the Polycomb-like proteins hPCL3/PHF1 [PMID:22315224]. A central node of HIC1 function is direct repression of the SIRT1 deacetylase: HIC1/SIRT1 complexes bind the SIRT1 promoter, and loss of HIC1 raises SIRT1, which deacetylates and inactivates p53 to permit survival after DNA damage, forming a self-reinforcing tumor-suppressor loop [PMID:16269335]. HIC1 repressive activity is governed by a competitive K314 acetylation/SUMOylation switch—SIRT1 and HDAC4 deacetylate K314 to favor SUMOylation, which enhances repression and MTA1 recruitment [PMID:17283066, PMID:23417673]. HIC1 represses an extensive direct target program including ATOH1, E2F-responsive genes, p21, CXCR7, EphA2, ephrin-A1, ADRB2, TLR2, and IL-6, linking it to control of proliferation, differentiation, migration, and inflammatory signaling [PMID:18347096, PMID:19525223, PMID:20154726, PMID:22184117, PMID:22194601, PMID:19015639, PMID:25934696, PMID:23178572, PMID:27107418], and it antagonizes Wnt/TCF and STAT3 signaling by sequestering or displacing these factors from target promoters [PMID:16724116, PMID:24067369]. In vivo, conditional deletion shows HIC1 maintains quiescence of skeletal-muscle mesenchymal progenitors and cardiac fibro/adipogenic progenitors [PMID:31809738, PMID:31978365] and regulates intestinal T-cell homeostasis downstream of retinoic acid [PMID:28327618].","teleology":[{"year":1995,"claim":"Established HIC1 as a p53-regulated tumor suppressor, answering whether the hypermethylated locus encoded a functional growth-suppressive gene.","evidence":"p53 expression vector transfection with RT-PCR, identification of a 5' p53 binding site, and colony suppression in brain/breast/colon cancer cells","pmids":["7585125"],"confidence":"High","gaps":["Did not define HIC1's DNA-binding specificity or repression mechanism","No direct target genes identified"]},{"year":1999,"claim":"Defined the BTB/POZ domain as an autonomous repression module that operates through a non-canonical, HDAC-independent route distinct from BCL-6/PLZF.","evidence":"Mammalian two-hybrid, in vivo/in vitro Co-IP for SMRT/N-CoR/mSin3A/HDAC1, and trichostatin A reporter assays","pmids":["10611298"],"confidence":"High","gaps":["The actual corepressors recruited by the BTB/POZ domain were not identified","DNA-binding consensus still unknown"]},{"year":2002,"claim":"Identified CtBP as a HIC1 corepressor via the GLDLSKK motif, reconciling the earlier HDAC-independent observation by revealing both HDAC-independent (BTB/POZ) and HDAC-dependent (CtBP) repression arms.","evidence":"In vivo/in vitro Co-IP, mammalian two-hybrid, Gal4 reporter assays, trichostatin A sensitivity","pmids":["12052894"],"confidence":"High","gaps":["Did not define which target promoters use the CtBP arm","Physiological regulation of the interaction not addressed"]},{"year":2004,"claim":"Defined the HIC1 DNA-binding consensus and the role of BTB/POZ in cooperative multisite binding, providing the basis for identifying direct targets.","evidence":"SELEX, EMSA, ChIP, luciferase reporters, deletion/mutagenesis; plus separate identification of O-GlcNAc sites in the DNA-binding domain","pmids":["15231840","15373830"],"confidence":"High","gaps":["Genome-wide occupancy not mapped","Functional consequence of O-GlcNAc on full-length HIC1 unclear"]},{"year":2005,"claim":"Placed HIC1 at the apex of a SIRT1-p53 tumor-suppressor loop, explaining how HIC1 inactivation enables apoptosis bypass after DNA damage.","evidence":"Reciprocal Co-IP, ChIP of the SIRT1 promoter, reporter assays, and siRNA knockdown with apoptosis readout","pmids":["16269335"],"confidence":"High","gaps":["Did not address how the HIC1/SIRT1 interaction is regulated","Other SIRT1-promoter corepressors not yet resolved"]},{"year":2006,"claim":"Extended HIC1 repression to Wnt signaling antagonism, showing it sequesters TCF-4/beta-catenin into nuclear bodies rather than only repressing classic targets.","evidence":"Co-IP, confocal imaging of nuclear bodies, Wnt-responsive luciferase reporters; plus mutagenesis showing CtBP binding is NADH-stimulated","pmids":["16724116","16762039"],"confidence":"Medium","gaps":["Nuclear-body sequestration mechanism not structurally defined","In vivo relevance to Wnt-driven tumors not tested here"]},{"year":2007,"claim":"Revealed a K314 acetylation/SUMOylation switch and a metabolic/redox input via CtBP, explaining how HIC1 repression is dynamically tuned to nutrient and modification state.","evidence":"In vivo SUMOylation and in vitro P300/CBP acetylation assays, K314R/E316A mutagenesis, SIRT1 siRNA; plus 2-deoxyglucose modulation of CtBP association","pmids":["17283066","17213307"],"confidence":"High","gaps":["SUMO E3 ligase and upstream signaling to K314 not fully defined","Direct downstream effect on target panels not enumerated"]},{"year":2008,"claim":"Linked HIC1 repression to developmental and oncogenic control by identifying ATOH1 as a direct target and demonstrating BRG1/SWI/SNF as a repression effector.","evidence":"ChIP, reporter assays, Ptch1/Hic1 compound-heterozygote medulloblastoma genetics; BRG1-dependent repression of E2F genes via ChIP/Co-IP in BRG1-null cells","pmids":["18347096","19015639"],"confidence":"High","gaps":["How HIC1 selects SWI/SNF versus other corepressors at a given promoter unclear","ATOH1 repression mechanism (PRC2 involvement) not yet established"]},{"year":2009,"claim":"Broadened the direct HIC1 target repertoire (CXCR7) and established ARID1A-containing SWI/SNF recruitment as a defined corepressor pathway.","evidence":"Expression profiling, ChIP/sequential ChIP with CtBP, siRNA; yeast two-hybrid and reciprocal Co-IP in BRG1-/- cells for ARID1A","pmids":["19525223","19486893"],"confidence":"Medium","gaps":["Determinants directing CtBP vs SWI/SNF complex choice unresolved","Reciprocal validation limited to single lab"]},{"year":2011,"claim":"Connected HIC1 loss to a pro-migratory/invasive program through direct repression of receptor genes EphA2 and ADRB2 via MTA1/NuRD recruitment.","evidence":"ChIP, sequential ChIP with MTA1, siRNA knockdown with migration and invasion assays","pmids":["22184117","22194601"],"confidence":"Medium","gaps":["In vivo metastasis dependence on these specific targets not isolated","Single-lab functional assays"]},{"year":2012,"claim":"Defined PRC2 (via hPCL3/PHF1) as a HIC1 corepressor and mapped the SIRT1-dependent, phosphorylation-gated HIC1/SIRT1 interaction interface, integrating chromatin silencing with the deacetylation switch.","evidence":"Yeast two-hybrid, Co-IP, ChIP for EZH2 at ATOH1; SIRT1 domain mapping (ESA region) and CKII phosphorylation of SIRT1 S659/661; plus STAT3 sequestration identified by MS/Co-IP","pmids":["22315224","22510409","24067369"],"confidence":"Medium","gaps":["How HIC1 coordinates PRC2 with NuRD/SWI/SNF at the same loci unclear","STAT3 antagonism mechanism not structurally resolved"]},{"year":2013,"claim":"Tied the SUMOylation switch to the DNA-damage response, showing DSBs drive HDAC4/Ubc9-dependent K314 SUMOylation that favors HIC1/MTA1 and promotes repair.","evidence":"Co-IP, in vivo SUMOylation, gammaH2AX foci, etoposide damage model, non-SUMOylatable mutants; plus direct repression of p21 by ChIP/siRNA","pmids":["23417673","23178572"],"confidence":"Medium","gaps":["Direct enzymatic SUMO ligase identity incomplete","Single-lab functional readouts"]},{"year":2015,"claim":"Implicated HIC1 in restraining innate inflammatory signaling, showing direct TLR2 repression that limits NF-kB activity and colonic tumorigenesis.","evidence":"ChIP, conditional Cre/loxP knockout, intestinal organoids, chemical carcinogenesis model","pmids":["25934696"],"confidence":"Medium","gaps":["Whether TLR2 derepression alone drives the tumor phenotype not isolated","Corepressor used at TLR2 not specified"]},{"year":2016,"claim":"Connected HIC1 loss to autocrine cytokine signaling (IL-6/STAT3) and to a viral transcription context, expanding its inflammatory and gene-regulatory reach.","evidence":"IL-6: ChIP, reporter, siRNA, rescue in NSCLC; HIV: Co-IP with CTIP2/HMGA1, K314 acetylation-dependent Tat repression","pmids":["27107418","27725726"],"confidence":"Medium","gaps":["Direct vs indirect contributions of additional targets not separated","HIV repression generality untested"]},{"year":2017,"claim":"Dissociated HIC1's repair and apoptotic functions, showing SUMOylation is dispensable for DSB repair but required for the apoptotic transcriptional response to irreparable damage via ATM-dependent MTA1/MTA3 recruitment to SIRT1.","evidence":"Comet assay, gammaH2AX foci, Co-IP, ChIP, E316A mutant, ATM/Chk2 inhibitors, expression profiling","pmids":["27935866"],"confidence":"Medium","gaps":["The damage-sensing step that distinguishes reparable vs irreparable DSBs is undefined","Single-lab study"]},{"year":2018,"claim":"Established tissue-level roles for HIC1 in immune homeostasis and the tumor microenvironment beyond cell-autonomous repression.","evidence":"T-cell-specific knockout with vitamin A-deficient diet and infection models; mammary-specific knockout linking HIC1 loss to CXCL14/GPR85 fibroblast activation; plus renal EZH2/DNMT1 recruitment to SIRT1 under high glucose","pmids":["28327618","30204129","30496037"],"confidence":"Medium","gaps":["Direct HIC1 targets governing T-cell IL-17A output not fully mapped","Paracrine CXCL14 regulation may be indirect"]},{"year":2019,"claim":"Defined HIC1 as a marker and enforcer of adult mesenchymal/progenitor quiescence, establishing a homeostatic role distinct from its tumor-suppressor activity.","evidence":"Conditional knockout, scRNA-seq, ATAC-seq, lineage tracing in skeletal muscle; conditional knockout in cardiac PDGFRa+/SCA-1+ progenitors driving arrhythmogenic cardiomyopathy","pmids":["31809738","31978365"],"confidence":"High","gaps":["Direct target genes maintaining quiescence not pinned down","Link between quiescence program and the SIRT1/p53 axis unexplored"]},{"year":2021,"claim":"Confirmed conserved ATOH1 repression in cochlear differentiation and added a degradation route (FBXW11) controlling HIC1 protein stability and downstream SIRT1.","evidence":"Cochlear organoid knockdown/overexpression with Atoh1 enhancer reporter and C521S DNA-binding mutant; FBXW11 Co-IP, ubiquitination assay, xenograft in colorectal cancer","pmids":["33770497","34642302"],"confidence":"Medium","gaps":["Upstream signals controlling FBXW11-mediated turnover unclear","Whether degradation is regulated coordinately with the K314 switch unknown"]},{"year":null,"claim":"How HIC1 selects among its many corepressor complexes (CtBP, NuRD, SWI/SNF, PRC2) at individual promoters, and how the K314 switch, O-GlcNAcylation, and FBXW11-mediated turnover are integrated in vivo, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of HIC1 corepressor selection","No genome-wide occupancy map integrating modification state","Mechanism coupling tumor-suppressor and quiescence programs undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,5,6,8]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[6,18,31]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[7,20]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,11,15]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,6,7]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,6,8]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[16,24]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,24]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[11,15,17]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,8,30]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,20,27]}],"complexes":["NuRD","SWI/SNF (BRG1/ARID1A)","PRC2"],"partners":["SIRT1","CTBP","MTA1","ARID1A","BRG1","EZH2","STAT3","HDAC4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q14526","full_name":"Hypermethylated in cancer 1 protein","aliases":["Zinc finger and BTB domain-containing protein 29"],"length_aa":733,"mass_kda":76.5,"function":"Transcriptional repressor (PubMed:12052894, PubMed:15231840). Recognizes and binds to the consensus sequence '5-[CG]NG[CG]GGGCA[CA]CC-3' (PubMed:15231840). May act as a tumor suppressor (PubMed:20154726). Involved in development of head, face, limbs and ventral body wall (By similarity). Involved in down-regulation of SIRT1 and thereby is involved in regulation of p53/TP53-dependent apoptotic DNA-damage responses (PubMed:16269335). The specific target gene promoter association seems to be depend on corepressors, such as CTBP1 or CTBP2 and MTA1 (PubMed:12052894, PubMed:20547755). In cooperation with MTA1 (indicative for an association with the NuRD complex) represses transcription from CCND1/cyclin-D1 and CDKN1C/p57Kip2 specifically in quiescent cells (PubMed:20547755). Involved in regulation of the Wnt signaling pathway probably by association with TCF7L2 and preventing TCF7L2 and CTNNB1 association with promoters of TCF-responsive genes (PubMed:16724116). Seems to repress transcription from E2F1 and ATOH1 which involves ARID1A, indicative for the participation of a distinct SWI/SNF-type chromatin-remodeling complex (PubMed:18347096, PubMed:19486893). Probably represses transcription of ACKR3, FGFBP1 and EFNA1 (PubMed:16690027, PubMed:19525223, PubMed:20154726)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q14526/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HIC1","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/HIC1","total_profiled":1310},"omim":[{"mim_id":"613487","title":"MICRO RNA 212; MIR212","url":"https://www.omim.org/entry/613487"},{"mim_id":"610016","title":"MICRO RNA 132; MIR132","url":"https://www.omim.org/entry/610016"},{"mim_id":"607712","title":"HYPERMETHYLATED IN CANCER 2; HIC2","url":"https://www.omim.org/entry/607712"},{"mim_id":"607432","title":"LISSENCEPHALY 1; LIS1","url":"https://www.omim.org/entry/607432"},{"mim_id":"604479","title":"SIRTUIN 1; SIRT1","url":"https://www.omim.org/entry/604479"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/HIC1"},"hgnc":{"alias_symbol":["ZBTB29","ZNF901"],"prev_symbol":[]},"alphafold":{"accession":"Q14526","domains":[{"cath_id":"3.30.710","chopping":"17-107_124-151","consensus_level":"medium","plddt":59.5605,"start":17,"end":151},{"cath_id":"3.30.160","chopping":"434-475_531-558","consensus_level":"medium","plddt":68.8441,"start":434,"end":558},{"cath_id":"3.30.160.60","chopping":"561-616","consensus_level":"medium","plddt":76.7723,"start":561,"end":616},{"cath_id":"-","chopping":"653-733","consensus_level":"medium","plddt":61.5211,"start":653,"end":733}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14526","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14526-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14526-F1-predicted_aligned_error_v6.png","plddt_mean":50.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HIC1","jax_strain_url":"https://www.jax.org/strain/search?query=HIC1"},"sequence":{"accession":"Q14526","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14526.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14526/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14526"}},"corpus_meta":[{"pmid":"16269335","id":"PMC_16269335","title":"Tumor 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immunoprecipitation (ChIP), promoter reporter assays, siRNA knockdown with apoptosis readout\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, ChIP, functional rescue experiments; independently replicated across multiple subsequent studies\",\n      \"pmids\": [\"16269335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"HIC1 is activated transcriptionally by wild-type p53 (p53 binding site identified in the 5' flanking region) and suppresses colony formation in brain, breast, and colon cancer cells when inserted exogenously, establishing it as a p53-regulated tumor suppressor.\",\n      \"method\": \"p53 expression vector transfection with RT-PCR for HIC1 expression, colony suppression assay, sequence analysis of p53 binding site\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (functional p53 transactivation, colony suppression), replicated by subsequent studies\",\n      \"pmids\": [\"7585125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HIC1 represses SIRT1 transcription through a metabolically regulated complex with the redox sensor CtBP; treatment with the glycolytic blocker 2-deoxyglucose decreases CtBP association with HIC1, thereby de-repressing SIRT1 expression in response to nutrient deprivation.\",\n      \"method\": \"Co-immunoprecipitation, promoter reporter assays, pharmacological treatment (2-deoxyglucose)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional reporter assays in single lab with two orthogonal methods\",\n      \"pmids\": [\"17213307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HIC1 is SUMOylated in vivo on lysine K314; this SUMOylation positively controls HIC1 transcriptional repression activity. HIC1 is also acetylated in vitro by P300/CBP on K314, creating a competitive acetylation/SUMOylation switch. SIRT1 and HDAC4 deacetylate K314 to favor SUMOylation; SIRT1 knockdown reduces HIC1 SUMOylation.\",\n      \"method\": \"In vivo SUMOylation assay, in vitro acetylation assay with P300/CBP, site-directed mutagenesis (K314R, E316A, P317A), siRNA knockdown of SIRT1, transfection reporter assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assays, mutagenesis, and siRNA rescue in single lab with multiple orthogonal methods\",\n      \"pmids\": [\"17283066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"HIC1 interacts with CtBP corepressor through a conserved GLDLSKK motif (a variant of the PxDLSxK/R CtBP interaction motif); BTB/POZ domain dimerization is required for this interaction. HIC1 mediates transcriptional repression via both HDAC-independent (BTB/POZ) and HDAC-dependent (CtBP-dependent) mechanisms.\",\n      \"method\": \"In vivo and in vitro Co-immunoprecipitation, mammalian two-hybrid, Gal4 fusion reporter assays, trichostatin A sensitivity assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro and in vivo binding assays plus functional reporter assays with mutagenesis in single lab\",\n      \"pmids\": [\"12052894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The BTB/POZ domain of HIC1 acts as an autonomous transcriptional repression domain but, unlike BCL-6 and PLZF, does not recruit SMRT/N-CoR, mSin3A, or HDAC-1 complexes in vivo or in vitro, and HIC1-mediated repression is not alleviated by the HDAC inhibitor trichostatin A.\",\n      \"method\": \"Mammalian two-hybrid, in vivo and in vitro Co-immunoprecipitation, trichostatin A treatment with reporter assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal methods (Co-IP in vivo and in vitro, pharmacological inhibitor, reporter), single lab\",\n      \"pmids\": [\"10611298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HIC1 binds the consensus DNA sequence 5'-(C/G)NG(C/G)GGGCA(C/A)CC-3' (GGCA core motif bound by zinc fingers 3 and 4); the BTB/POZ domain inhibits binding to a single site but mediates cooperative binding to multiple concatemerized sites. Endogenous HIC1 represses transcription through direct binding to these sites, confirmed by ChIP.\",\n      \"method\": \"SELEX (selection and amplification of binding sites), electrophoretic mobility shift assay (EMSA), chromatin immunoprecipitation (ChIP), luciferase reporter assays, deletion/mutagenesis analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — SELEX, EMSA, ChIP, and reporter assays in single lab with multiple orthogonal methods\",\n      \"pmids\": [\"15231840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"HIC1 antagonizes TCF/beta-catenin-mediated transcription in Wnt-stimulated cells by associating with TCF-4 and recruiting TCF-4 and beta-catenin to HIC1 nuclear bodies, preventing their association with TCF-binding elements on Wnt-responsive gene promoters.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence/confocal microscopy (nuclear body co-localization), luciferase reporter assays for Wnt-responsive transcription\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, live-cell imaging of nuclear bodies, functional reporter assays; single lab, two orthogonal methods\",\n      \"pmids\": [\"16724116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HIC1 is a direct transcriptional repressor of ATOH1 (Atonal Homolog 1); loss of HIC1 in mouse GCPs leads to increased ATOH1 expression, and compound Ptch1/Hic1 heterozygotes show fourfold increased medulloblastoma incidence compared with Ptch1 heterozygotes alone.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), luciferase reporter assays, mouse genetic epistasis (compound heterozygotes), in vitro growth assays with ATOH1 knockdown\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP, reporter assays, and in vivo mouse genetic epistasis in single study; replicated in cochlea study (PMID 33770497)\",\n      \"pmids\": [\"18347096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CXCR7 is a direct transcriptional target gene of HIC1; endogenous HIC1 binds the CXCR7 promoter together with CtBP corepressor; siRNA knockdown of HIC1 in WI38 fibroblasts upregulates CXCR7.\",\n      \"method\": \"Genome-wide expression profiling, quantitative RT-PCR, luciferase reporter/promoter deletion assays, ChIP and sequential ChIP (ChIP-on-ChIP), siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, sequential ChIP, reporter assays, and siRNA knockdown; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"19525223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HIC1 interacts with and represses ARID1A/BAF250A-containing SWI/SNF complexes; Co-IP in WI38 fibroblasts and BRG1-/- SW13 cells showed that endogenous HIC1 and ARID1A interact in a BRG1-dependent manner; sequential ChIP demonstrated HIC1 represses E2F1 via recruitment of ARID1A-containing SWI/SNF complexes. HIC1 does not interact with BRM.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation (reciprocal, in BRG1-/- cells), sequential ChIP (ChIP-reChIP)\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid, reciprocal Co-IP, and ChIP-reChIP; single lab, three complementary methods\",\n      \"pmids\": [\"19486893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HIC1 interacts with MTA1 (a subunit of the NuRD complex) as a new corepressor; this interaction is regulated by competitive posttranslational modifications at K314 (SUMOylation promotes, acetylation inhibits). HIC1/MTA1 complexes bind Cyclin D1 and p57KIP2 promoters in quiescent cells; HIC1/MTA1 and HIC1/CtBP complexes differentially occupy distinct HIC1-responsive elements on the SIRT1 promoter.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, chromatin immunoprecipitation (ChIP), sequential ChIP\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid, Co-IP, ChIP, and sequential ChIP; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"20547755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HIC1 is a direct transcriptional repressor of ephrin-A1; mouse embryos lacking both Hic1 alleles show developmental defects spatially associated with ephrin-A1 misexpression; re-expression of HIC1 in breast cancer cells reduces tumor growth, partially rescued by ephrin-A1 co-overexpression.\",\n      \"method\": \"ChIP, luciferase reporter assays, mouse knockout/heterozygote in vivo model, in vivo tumor growth rescue experiment\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assays plus in vivo mouse genetic validation; single lab\",\n      \"pmids\": [\"20154726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"EphA2 is a direct transcriptional target gene of HIC1; endogenous HIC1 proteins are bound together with MTA1 corepressor to the EphA2 promoter in WI38 cells; siRNA knockdown of HIC1 in normal breast epithelial cells upregulates EphA2 and increases cellular migration.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), sequential ChIP, RT-PCR and Western blot, siRNA knockdown with migration assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, sequential ChIP, and functional siRNA knockdown; single lab, multiple methods\",\n      \"pmids\": [\"22184117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HIC1 is a direct transcriptional repressor of the β-2 adrenergic receptor (ADRB2); agonist-mediated stimulation of ADRB2 increases migration and invasion of breast cancer cells, effects abolished by HIC1 re-expression or siRNA-mediated ADRB2 knockdown.\",\n      \"method\": \"Promoter luciferase assay, ChIP, sequential ChIP, siRNA knockdown, migration and invasion assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, sequential ChIP, functional siRNA rescue; single lab\",\n      \"pmids\": [\"22194601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HIC1 interacts with Polycomb-like proteins hPCL3 and PHF1 to form a stable complex with PRC2 members EZH2, EED, and Suz12; this complex represses HIC1 target genes including ATOH1; HIC1 siRNA knockdown leads to partial displacement of EZH2 from the ATOH1 promoter.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, ChIP, siRNA knockdown, in vivo mouse cerebellar developmental model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid, Co-IP, ChIP, and in vivo validation; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"22315224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DNA double-strand breaks activate HIC1 SUMOylation on K314 through a mechanism involving enhanced HDAC4/Ubc9 interaction, SUMOylation of SIRT1 (Lys-734), and SUMO-dependent recruitment of HDAC4 by SIRT1. This deacetylation/SUMOylation switch of HIC1 favors HIC1/MTA1 interaction and promotes DNA repair. Wild-type but not non-SUMOylatable HIC1 mutants reduce γH2AX foci after etoposide treatment.\",\n      \"method\": \"Co-immunoprecipitation, in vivo SUMOylation assay, γH2AX foci assay (immunofluorescence), etoposide DNA damage model, siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, functional DNA repair assay, mutagenesis validation; single lab\",\n      \"pmids\": [\"23417673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HIC1 recruits BRG1, the ATPase subunit of SWI/SNF chromatin-remodeling complexes, to E2F-responsive gene promoters to repress their transcription; HIC1-mediated transcriptional repression of E2F-responsive genes is dependent on BRG1 activity.\",\n      \"method\": \"ChIP, reporter assays, co-immunoprecipitation, BRG1-deficient cell lines\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, Co-IP, reporter assays, genetic (BRG1-null cells); single lab\",\n      \"pmids\": [\"19015639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HIC1 is O-GlcNAc glycosylated in vivo and in vitro at three major sites preferentially in the DNA-binding domain; O-GlcNAc modification does not affect the specific DNA-binding activity of full-length HIC1, but in BTB/POZ-deleted N-terminal truncations, glycosylation of the C-terminal tail (residues 670-711) abolishes DNA binding.\",\n      \"method\": \"In vivo and in vitro O-GlcNAc labeling, wheat germ agglutinin affinity purification, EMSA, C-terminal deletion mutants\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assay plus in vivo labeling and EMSA; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"15373830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The L225A mutation in the HIC1 GLDLSKK motif abolishes interaction with CtBP1 and CtBP2; the CtBP interaction is stimulated by agents that increase NADH levels; loss of CtBP interaction impairs HIC1-mediated transcriptional repression.\",\n      \"method\": \"Point mutagenesis, co-immunoprecipitation, NADH/redox modulation assays, reporter transcription assays\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis, Co-IP, and functional reporter; single lab, two orthogonal methods\",\n      \"pmids\": [\"16762039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HIC1 forms complexes with STAT3 through interaction of the HIC1 C-terminal domain with the STAT3 DNA-binding domain; HIC1 overexpression or depletion respectively decreases or increases IL-6/OSM-induced STAT3 target gene expression (VEGF, c-Myc); HIC1 suppresses STAT3 binding to target gene promoters.\",\n      \"method\": \"Affinity capture followed by mass spectrometry, co-immunoprecipitation, luciferase reporter assays, ChIP, domain mapping, HIC1 mutant defective in STAT3 interaction\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass spectrometry identification, Co-IP, ChIP, and reporter assays; single lab, multiple methods\",\n      \"pmids\": [\"24067369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SIRT1 interacts with the BTB/POZ domain of HIC1; the amino acids 610-677 of SIRT1 (ESA region) are essential for the HIC1/SIRT1 interaction and HIC1 deacetylation; CKII-mediated phosphorylation of SIRT1 serine 659/661 (occurring upon DNA damage) is required for this interaction.\",\n      \"method\": \"Co-immunoprecipitation with deletion/domain mapping, site-directed mutagenesis, kinase assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping by Co-IP and mutagenesis; single lab, biochemical dissection\",\n      \"pmids\": [\"22510409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HIC1 directly represses TLR2 transcription; ChIP shows HIC1 association with TLR2 gene regulatory elements; Hic1-deficient MEFs and intestinal organoids show increased TLR2, and Hic1 deficiency promotes NF-κB pathway activity and increases colonic tumor size in chemical carcinogenesis models.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), conditional Cre/loxP knockout, qRT-PCR, intestinal organoid culture, in vivo carcinogenesis model\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and genetic knockout with in vivo tumor model; single lab, two orthogonal methods\",\n      \"pmids\": [\"25934696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HIC1 directly represses p21 (CIP1/WAF1) transcription; ChIP demonstrates HIC1 occupancy on the p21 promoter; siRNA knockdown of HIC1 in BJ-Tert fibroblasts upregulates p21 and potentiates p21 response to etoposide-induced DNA damage.\",\n      \"method\": \"Luciferase promoter reporter assay, ChIP, siRNA knockdown, Western blot\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter and siRNA functional assays; single lab\",\n      \"pmids\": [\"23178572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HIC1 SUMOylation is dispensable for DNA repair (non-SUMOylatable E316A mutant repairs DSBs as efficiently as wt HIC1 in Comet assays) but is essential for the apoptotic transcriptional response to irreparable DSBs; irreparable DSBs (but not repairable ones) increase HIC1 SUMOylation and its interaction with MTA1/MTA3 and their binding to the SIRT1 promoter via an ATM-dependent (Chk2-independent) mechanism.\",\n      \"method\": \"Comet assay, γH2AX foci assay, Co-immunoprecipitation, ChIP, site-directed mutagenesis (E316A), ATM/Chk2 inhibitors, global expression profiling\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays and mutagenesis in single lab; mechanistically informative negative result for SUMOylation in repair included\",\n      \"pmids\": [\"27935866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HIC1 physically interacts with CTIP2 (Bcl11b) and HMGA1 to co-regulate cellular genes and repress Tat-dependent HIV-1 transcription; this repression is linked to HIC1 K314 acetylation status and SIRT1 deacetylase activity; HIC1 cooperates with HMGA1 in a TAR-dependent manner to facilitate HIC1/TAT interaction at the viral promoter.\",\n      \"method\": \"Co-immunoprecipitation, reporter assays, K314 acetylation-status manipulation, SIRT1 activity assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional reporter assays with mutagenesis; single lab\",\n      \"pmids\": [\"27725726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HIC1 expression in intestinal T cells is regulated by the vitamin A metabolite retinoic acid; HIC1-deficient T cells overproduce IL-17A in vitro and in vivo; T-cell-specific deletion of HIC1 reduces T cell numbers in the intestinal lamina propria and impairs intestinal immune homeostasis.\",\n      \"method\": \"Conditional T-cell-specific knockout (Cre/loxP), vitamin A-deficient diet model, flow cytometry, in vitro cytokine assays, in vivo infection model\",\n      \"journal\": \"Mucosal immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockout with multiple functional readouts; single lab\",\n      \"pmids\": [\"28327618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HIC1-deleted breast cancer cells secrete CXCL14, which binds GPR85 on mammary fibroblasts, activating them via ERK1/2, Akt, and neddylation pathways; activated fibroblasts then promote breast cancer progression via CCL17/CCR4-induced EMT.\",\n      \"method\": \"Conditional mammary-gland-specific Hic1 knockout mouse, cytokine secretion analysis, receptor binding assays, co-culture experiments, signaling pathway inhibition\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockout with in vivo model plus mechanistic signaling pathway analysis; single lab\",\n      \"pmids\": [\"30204129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HIC1 marks quiescent mesenchymal progenitors in skeletal muscle; Hic1 deletion leads to mesenchymal progenitor hyperplasia; single-cell RNA-seq and ATAC-seq reveal multiple subpopulations with distinct functions; Hic1+ MPs contribute to immunomodulation, trophic support, and differentiation into Col22a1-expressing myotendinous junction cells during muscle regeneration.\",\n      \"method\": \"Conditional knockout (Cre/loxP), single-cell RNA-seq, ATAC-seq, lineage tracing, flow cytometry, histology\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional genetic knockout with multiple high-resolution single-cell methods and lineage tracing; single lab but highly rigorous\",\n      \"pmids\": [\"31809738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Lineage-specific deletion of HIC1 in cardiac PDGFRa+/SCA-1+ fibro/adipogenic progenitors causes fibrofatty infiltration within the myocardium and drives pathological features of arrhythmogenic cardiomyopathy, demonstrating that HIC1 maintains progenitor quiescence in the heart.\",\n      \"method\": \"Conditional Cre/loxP knockout (lineage-specific), histology, cardiac function measurement, in vitro differentiation assays\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockout with defined cardiac phenotype; single lab\",\n      \"pmids\": [\"31978365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HIC1 directly represses IL-6 transcription in non-small cell lung cancer cells through sequence-specific binding to the IL-6 promoter; loss of HIC1 induces autocrine IL-6 secretion that activates STAT3 via JAK pathway, promoting NSCLC invasion and migration.\",\n      \"method\": \"ChIP, luciferase reporter assay, siRNA knockdown, IL-6 rescue experiment, in vitro and in vivo assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assays plus functional rescue; single lab\",\n      \"pmids\": [\"27107418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HIC1 represses Atoh1 transcription in cochlear supporting cells; Hic1 knockdown induces Atoh1 expression and promotes hair cell differentiation in cochlear organoids; wild-type HIC1 but not the DNA-binding mutant C521S suppresses the Atoh1 autoregulatory enhancer and blocks its responsiveness to β-catenin activation.\",\n      \"method\": \"siRNA knockdown and overexpression in cochlear organoids, luciferase reporter assay with Atoh1 enhancer, DNA-binding domain mutant (C521S), qRT-PCR\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional organoid model, mutagenesis, and reporter assays; single lab\",\n      \"pmids\": [\"33770497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In Xenopus, Hic1 regulates cranial neural crest migration by modulating cadherin expression profiles and canonical Wnt signaling; both overexpression and knockdown of hic1 impair neural crest migration in vivo and in tissue explants without affecting neural crest specification.\",\n      \"method\": \"Xenopus morpholino knockdown and mRNA overexpression, in vivo neural crest migration assay, tissue explant migration, qRT-PCR for cadherins and Wnt targets\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and ex vivo functional manipulation in Xenopus; single lab\",\n      \"pmids\": [\"32502469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FBXW11 targets HIC1 for ubiquitination and proteasomal degradation, reducing HIC1 protein stability in colorectal cancer cells; this leads to upregulation of SIRT1 (a direct HIC1 transcriptional target), promoting colorectal cancer stem-cell features and liver metastasis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Western blot, siRNA knockdown, xenograft mouse model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay with functional in vivo rescue; single lab\",\n      \"pmids\": [\"34642302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HIC1 directly represses GPX4 transcription in colon cancer cells; HIC1 overexpression augments ferroptotic cell death by reducing GPX4 expression, and HIC1 silencing attenuates ferroptosis and restores GPX4 expression.\",\n      \"method\": \"HIC1 overexpression/siRNA knockdown, GPX4 promoter reporter assay, glutathione and lipid peroxidation assays, xenograft model\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — reporter assay and functional overexpression/knockdown, but no direct ChIP for HIC1 at GPX4 promoter reported in abstract; single lab\",\n      \"pmids\": [\"37717793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HIC1 in renal tubular epithelial cells represses SIRT1 transcription by recruiting EZH2 (H3K27 trimethyltransferase) and DNMT1 to the SIRT1 promoter in response to high glucose; this epigenetic repression of SIRT1 by HIC1 contributes to ROS accumulation.\",\n      \"method\": \"ChIP for H3K27me3 and 5-methylcytosine, Co-immunoprecipitation (HIC1 with EZH2/DNMT1), siRNA knockdown, ROS measurement\",\n      \"journal\": \"Biochimica et biophysica acta. Gene regulatory mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, Co-IP, and functional siRNA knockdown; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"30496037\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HIC1 (Hypermethylated in Cancer 1) is a sequence-specific transcriptional repressor that dimerizes via its N-terminal BTB/POZ domain and binds a GC-rich consensus sequence through its C-terminal C2H2 zinc fingers; it recruits multiple corepressor complexes—including CtBP (via a GLDLSKK motif), NuRD/MTA1, SWI/SNF (BRG1/ARID1A), and PRC2 (via hPCL3/PHF1)—to repress direct target genes (including SIRT1, ATOH1, CXCR7, EphA2, ephrin-A1, ADRB2, TLR2, IL-6, GPX4, E2F1, p21, and p57KIP2); HIC1 repressive activity is modulated by a K314 acetylation/SUMOylation switch governed by SIRT1 and HDAC4 deacetylases, with DNA damage-induced CKII-phosphorylation of SIRT1 promoting its interaction with HIC1 to favor SUMOylation and NuRD recruitment; through SIRT1 repression, HIC1 maintains p53 acetylation and apoptotic competence, forming a regulatory feedback loop central to tumor suppression; HIC1 also maintains mesenchymal and tissue-resident progenitor cell quiescence in multiple adult tissues, and regulates immune cell function downstream of retinoic acid signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HIC1 is a sequence-specific transcriptional repressor that functions as a p53-inducible tumor suppressor and an enforcer of progenitor cell quiescence in adult tissues [#1, #28]. It binds a GC-rich consensus sequence (GGCA core) through its C-terminal C2H2 zinc fingers, with the N-terminal BTB/POZ domain dimerizing and mediating cooperative binding to concatemerized sites [#6]. The BTB/POZ domain is an autonomous repression module that, unlike related BTB proteins, does not recruit SMRT/N-CoR or mSin3A/HDAC1 [#5]; instead HIC1 represses transcription by recruiting a panel of corepressor machineries—CtBP via a GLDLSKK motif in a redox/NADH-dependent manner [#4, #19], the NuRD subunit MTA1 [#11], ARID1A/BRG1-containing SWI/SNF complexes [#10, #17], and PRC2 through the Polycomb-like proteins hPCL3/PHF1 [#15]. A central node of HIC1 function is direct repression of the SIRT1 deacetylase: HIC1/SIRT1 complexes bind the SIRT1 promoter, and loss of HIC1 raises SIRT1, which deacetylates and inactivates p53 to permit survival after DNA damage, forming a self-reinforcing tumor-suppressor loop [#0]. HIC1 repressive activity is governed by a competitive K314 acetylation/SUMOylation switch—SIRT1 and HDAC4 deacetylate K314 to favor SUMOylation, which enhances repression and MTA1 recruitment [#3, #16]. HIC1 represses an extensive direct target program including ATOH1, E2F-responsive genes, p21, CXCR7, EphA2, ephrin-A1, ADRB2, TLR2, and IL-6, linking it to control of proliferation, differentiation, migration, and inflammatory signaling [#8, #9, #12, #13, #14, #17, #22, #23, #30], and it antagonizes Wnt/TCF and STAT3 signaling by sequestering or displacing these factors from target promoters [#7, #20]. In vivo, conditional deletion shows HIC1 maintains quiescence of skeletal-muscle mesenchymal progenitors and cardiac fibro/adipogenic progenitors [#28, #29] and regulates intestinal T-cell homeostasis downstream of retinoic acid [#26].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established HIC1 as a p53-regulated tumor suppressor, answering whether the hypermethylated locus encoded a functional growth-suppressive gene.\",\n      \"evidence\": \"p53 expression vector transfection with RT-PCR, identification of a 5' p53 binding site, and colony suppression in brain/breast/colon cancer cells\",\n      \"pmids\": [\"7585125\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define HIC1's DNA-binding specificity or repression mechanism\", \"No direct target genes identified\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined the BTB/POZ domain as an autonomous repression module that operates through a non-canonical, HDAC-independent route distinct from BCL-6/PLZF.\",\n      \"evidence\": \"Mammalian two-hybrid, in vivo/in vitro Co-IP for SMRT/N-CoR/mSin3A/HDAC1, and trichostatin A reporter assays\",\n      \"pmids\": [\"10611298\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The actual corepressors recruited by the BTB/POZ domain were not identified\", \"DNA-binding consensus still unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified CtBP as a HIC1 corepressor via the GLDLSKK motif, reconciling the earlier HDAC-independent observation by revealing both HDAC-independent (BTB/POZ) and HDAC-dependent (CtBP) repression arms.\",\n      \"evidence\": \"In vivo/in vitro Co-IP, mammalian two-hybrid, Gal4 reporter assays, trichostatin A sensitivity\",\n      \"pmids\": [\"12052894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define which target promoters use the CtBP arm\", \"Physiological regulation of the interaction not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the HIC1 DNA-binding consensus and the role of BTB/POZ in cooperative multisite binding, providing the basis for identifying direct targets.\",\n      \"evidence\": \"SELEX, EMSA, ChIP, luciferase reporters, deletion/mutagenesis; plus separate identification of O-GlcNAc sites in the DNA-binding domain\",\n      \"pmids\": [\"15231840\", \"15373830\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide occupancy not mapped\", \"Functional consequence of O-GlcNAc on full-length HIC1 unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Placed HIC1 at the apex of a SIRT1-p53 tumor-suppressor loop, explaining how HIC1 inactivation enables apoptosis bypass after DNA damage.\",\n      \"evidence\": \"Reciprocal Co-IP, ChIP of the SIRT1 promoter, reporter assays, and siRNA knockdown with apoptosis readout\",\n      \"pmids\": [\"16269335\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address how the HIC1/SIRT1 interaction is regulated\", \"Other SIRT1-promoter corepressors not yet resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Extended HIC1 repression to Wnt signaling antagonism, showing it sequesters TCF-4/beta-catenin into nuclear bodies rather than only repressing classic targets.\",\n      \"evidence\": \"Co-IP, confocal imaging of nuclear bodies, Wnt-responsive luciferase reporters; plus mutagenesis showing CtBP binding is NADH-stimulated\",\n      \"pmids\": [\"16724116\", \"16762039\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear-body sequestration mechanism not structurally defined\", \"In vivo relevance to Wnt-driven tumors not tested here\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed a K314 acetylation/SUMOylation switch and a metabolic/redox input via CtBP, explaining how HIC1 repression is dynamically tuned to nutrient and modification state.\",\n      \"evidence\": \"In vivo SUMOylation and in vitro P300/CBP acetylation assays, K314R/E316A mutagenesis, SIRT1 siRNA; plus 2-deoxyglucose modulation of CtBP association\",\n      \"pmids\": [\"17283066\", \"17213307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO E3 ligase and upstream signaling to K314 not fully defined\", \"Direct downstream effect on target panels not enumerated\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linked HIC1 repression to developmental and oncogenic control by identifying ATOH1 as a direct target and demonstrating BRG1/SWI/SNF as a repression effector.\",\n      \"evidence\": \"ChIP, reporter assays, Ptch1/Hic1 compound-heterozygote medulloblastoma genetics; BRG1-dependent repression of E2F genes via ChIP/Co-IP in BRG1-null cells\",\n      \"pmids\": [\"18347096\", \"19015639\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How HIC1 selects SWI/SNF versus other corepressors at a given promoter unclear\", \"ATOH1 repression mechanism (PRC2 involvement) not yet established\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Broadened the direct HIC1 target repertoire (CXCR7) and established ARID1A-containing SWI/SNF recruitment as a defined corepressor pathway.\",\n      \"evidence\": \"Expression profiling, ChIP/sequential ChIP with CtBP, siRNA; yeast two-hybrid and reciprocal Co-IP in BRG1-/- cells for ARID1A\",\n      \"pmids\": [\"19525223\", \"19486893\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants directing CtBP vs SWI/SNF complex choice unresolved\", \"Reciprocal validation limited to single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected HIC1 loss to a pro-migratory/invasive program through direct repression of receptor genes EphA2 and ADRB2 via MTA1/NuRD recruitment.\",\n      \"evidence\": \"ChIP, sequential ChIP with MTA1, siRNA knockdown with migration and invasion assays\",\n      \"pmids\": [\"22184117\", \"22194601\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo metastasis dependence on these specific targets not isolated\", \"Single-lab functional assays\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined PRC2 (via hPCL3/PHF1) as a HIC1 corepressor and mapped the SIRT1-dependent, phosphorylation-gated HIC1/SIRT1 interaction interface, integrating chromatin silencing with the deacetylation switch.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, ChIP for EZH2 at ATOH1; SIRT1 domain mapping (ESA region) and CKII phosphorylation of SIRT1 S659/661; plus STAT3 sequestration identified by MS/Co-IP\",\n      \"pmids\": [\"22315224\", \"22510409\", \"24067369\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How HIC1 coordinates PRC2 with NuRD/SWI/SNF at the same loci unclear\", \"STAT3 antagonism mechanism not structurally resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Tied the SUMOylation switch to the DNA-damage response, showing DSBs drive HDAC4/Ubc9-dependent K314 SUMOylation that favors HIC1/MTA1 and promotes repair.\",\n      \"evidence\": \"Co-IP, in vivo SUMOylation, gammaH2AX foci, etoposide damage model, non-SUMOylatable mutants; plus direct repression of p21 by ChIP/siRNA\",\n      \"pmids\": [\"23417673\", \"23178572\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct enzymatic SUMO ligase identity incomplete\", \"Single-lab functional readouts\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Implicated HIC1 in restraining innate inflammatory signaling, showing direct TLR2 repression that limits NF-kB activity and colonic tumorigenesis.\",\n      \"evidence\": \"ChIP, conditional Cre/loxP knockout, intestinal organoids, chemical carcinogenesis model\",\n      \"pmids\": [\"25934696\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TLR2 derepression alone drives the tumor phenotype not isolated\", \"Corepressor used at TLR2 not specified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected HIC1 loss to autocrine cytokine signaling (IL-6/STAT3) and to a viral transcription context, expanding its inflammatory and gene-regulatory reach.\",\n      \"evidence\": \"IL-6: ChIP, reporter, siRNA, rescue in NSCLC; HIV: Co-IP with CTIP2/HMGA1, K314 acetylation-dependent Tat repression\",\n      \"pmids\": [\"27107418\", \"27725726\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect contributions of additional targets not separated\", \"HIV repression generality untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Dissociated HIC1's repair and apoptotic functions, showing SUMOylation is dispensable for DSB repair but required for the apoptotic transcriptional response to irreparable damage via ATM-dependent MTA1/MTA3 recruitment to SIRT1.\",\n      \"evidence\": \"Comet assay, gammaH2AX foci, Co-IP, ChIP, E316A mutant, ATM/Chk2 inhibitors, expression profiling\",\n      \"pmids\": [\"27935866\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The damage-sensing step that distinguishes reparable vs irreparable DSBs is undefined\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established tissue-level roles for HIC1 in immune homeostasis and the tumor microenvironment beyond cell-autonomous repression.\",\n      \"evidence\": \"T-cell-specific knockout with vitamin A-deficient diet and infection models; mammary-specific knockout linking HIC1 loss to CXCL14/GPR85 fibroblast activation; plus renal EZH2/DNMT1 recruitment to SIRT1 under high glucose\",\n      \"pmids\": [\"28327618\", \"30204129\", \"30496037\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct HIC1 targets governing T-cell IL-17A output not fully mapped\", \"Paracrine CXCL14 regulation may be indirect\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined HIC1 as a marker and enforcer of adult mesenchymal/progenitor quiescence, establishing a homeostatic role distinct from its tumor-suppressor activity.\",\n      \"evidence\": \"Conditional knockout, scRNA-seq, ATAC-seq, lineage tracing in skeletal muscle; conditional knockout in cardiac PDGFRa+/SCA-1+ progenitors driving arrhythmogenic cardiomyopathy\",\n      \"pmids\": [\"31809738\", \"31978365\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct target genes maintaining quiescence not pinned down\", \"Link between quiescence program and the SIRT1/p53 axis unexplored\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Confirmed conserved ATOH1 repression in cochlear differentiation and added a degradation route (FBXW11) controlling HIC1 protein stability and downstream SIRT1.\",\n      \"evidence\": \"Cochlear organoid knockdown/overexpression with Atoh1 enhancer reporter and C521S DNA-binding mutant; FBXW11 Co-IP, ubiquitination assay, xenograft in colorectal cancer\",\n      \"pmids\": [\"33770497\", \"34642302\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Upstream signals controlling FBXW11-mediated turnover unclear\", \"Whether degradation is regulated coordinately with the K314 switch unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HIC1 selects among its many corepressor complexes (CtBP, NuRD, SWI/SNF, PRC2) at individual promoters, and how the K314 switch, O-GlcNAcylation, and FBXW11-mediated turnover are integrated in vivo, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of HIC1 corepressor selection\", \"No genome-wide occupancy map integrating modification state\", \"Mechanism coupling tumor-suppressor and quiescence programs undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 5, 6, 8]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [6, 18, 31]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [7, 20]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 11, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 6, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 6, 8]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [16, 24]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 24]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [11, 15, 17]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 8, 30]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 20, 27]}\n    ],\n    \"complexes\": [\"NuRD\", \"SWI/SNF (BRG1/ARID1A)\", \"PRC2\"],\n    \"partners\": [\"SIRT1\", \"CtBP\", \"MTA1\", \"ARID1A\", \"BRG1\", \"EZH2\", \"STAT3\", \"HDAC4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}