{"gene":"SIN3A","run_date":"2026-06-10T07:46:32","timeline":{"discoveries":[{"year":2004,"finding":"Snail mediates E-cadherin repression by recruiting a complex containing HDAC1, HDAC2, and mSin3A via its SNAG domain; this interaction is SNAG domain-dependent and results in histone H3/H4 deacetylation at the E-cadherin promoter.","method":"Co-immunoprecipitation, ChIP, TSA inhibitor experiments, overexpression studies","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, ChIP, and pharmacological inhibition in multiple cell lines establishing direct causal relationship","pmids":["14673164"],"is_preprint":false},{"year":1999,"finding":"The N-terminal repression domain of REST recruits Sin3A and histone deacetylase to neuronal gene promoters (GluR2 and type II sodium channel) in nonneuronal cells, establishing a mechanism for RE1/NRSE-mediated silencing.","method":"Multiple co-immunoprecipitation, reporter assay, ChIP-like promoter analysis","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, functional assays) establishing mechanism; replicated across two gene targets","pmids":["10491605"],"is_preprint":false},{"year":2008,"finding":"PRMT1 methylates RUNX1 at arginine residues R206 and R210, which lie within the SIN3A-interaction region of RUNX1; this methylation abrogates RUNX1-SIN3A association, converting RUNX1 from a repressor to an activator. shRNA against PRMT1 enhances RUNX1-SIN3A association.","method":"Mass spectrometry, methyl-arginine-specific antibody, Co-IP, shRNA knockdown, ChIP","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mass spectrometry identification of methylation sites, orthogonal antibody validation, functional rescue experiments, ChIP","pmids":["18316480"],"is_preprint":false},{"year":2001,"finding":"PSF (polypyrimidine tract-binding protein-associated splicing factor) acts as a corepressor by interacting with Sin3A and mediating silencing through recruitment of HDACs to the DNA-binding domains of nuclear hormone receptors TR and RXR, independently of N-CoR/SMRT.","method":"Biochemical pulldown, Co-immunoprecipitation, in vivo transcription assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional transcription assays in single lab; novel pathway placement","pmids":["11259580"],"is_preprint":false},{"year":2017,"finding":"Human THO complex physically interacts with the Sin3A histone deacetylase complex; this interaction suppresses co-transcriptional R-loop formation, DNA damage, and replication impairment. Depletion of either THO or Sin3A leads to histone hypo-acetylation, increased R-loop accumulation, and genomic instability.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, DNA-RNA hybrid detection (DRIP), replication fork assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus multiple functional assays (R-loop, DNA damage, replication) establishing physical and functional interaction","pmids":["29074626"],"is_preprint":false},{"year":2003,"finding":"Nkx3.2 forms an in vivo complex with HDAC1 and Smad1/Smad4 in a BMP-dependent manner; recruitment of the HDAC/Sin3A complex to Nkx3.2 requires Smad1/4 interaction, establishing that BMP-Smads potentiate transcriptional repression through Sin3A.","method":"Co-immunoprecipitation, reporter assay, dominant-negative Smad4 cell line rescue","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with genetic rescue in Smad4-deficient cells, single lab","pmids":["14612411"],"is_preprint":false},{"year":2000,"finding":"MBD2b binds directly to Sin3A; the minimal repression domain of MBD2b overlaps with its methyl-CpG-binding domain, and the interaction domain on Sin3A is the paired amphipathic helix 3 (PAH3) region.","method":"GST pulldown, co-immunoprecipitation, deletion mapping","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro binding assay and Co-IP with domain mapping; single lab","pmids":["10950960"],"is_preprint":false},{"year":2013,"finding":"EBNA3C physically interacts with Sin3A and recruits it to the CDKN2A (p14ARF) promoter through BATF/IRF4/SPI1/RUNX3 composite sites; conditional EBNA3C inactivation significantly decreased Sin3A binding at the p14ARF promoter, establishing Sin3A-mediated repression of p14ARF and p16INK4A.","method":"ChIP-seq, Co-immunoprecipitation, conditional inactivation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus Co-IP with conditional inactivation; single lab","pmids":["24344258"],"is_preprint":false},{"year":2018,"finding":"SIN3A binds to promoters of hypoxia-repressed genes prior to hypoxia and participates in downregulation of 75% of hypoxia-repressed genes and induction of 47% of upregulated genes in endothelial cells; SIN3A occupancy is not altered by hypoxia itself but modulation of associated HDAC activity determines transcriptional output.","method":"siRNA knockdown, ChIP-seq, nascent RNA sequencing (4-thiouridine labeling)","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq and nascent transcriptomics with knockdown; single lab, two orthogonal methods","pmids":["29059365"],"is_preprint":false},{"year":2009,"finding":"Estrogen-bound ERα recruits Sin3A to the proximal A promoter of ESR1, leading to loss of RNA polymerase II and repression; a direct estrogen-responsive interaction between Sin3A and ERα was identified; Sin3A siRNA knockdown specifically inhibits estrogen-induced repression of ESR1.","method":"ChIP, Co-immunoprecipitation, siRNA knockdown","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and Co-IP with RNAi functional validation; single lab","pmids":["19620290"],"is_preprint":false},{"year":2012,"finding":"Sin3A directly interacts with STAT3, promotes STAT3 deacetylation, and is required for ISGF3-dependent (STAT1:STAT2:IRF9) gene transcription; Sin3A silencing results in prolonged nuclear retention of activated STAT3, enhanced STAT3 recruitment to the SOCS3 promoter, histone hyperacetylation, and enhanced STAT3-dependent transcription. Sin3A acts as a context-dependent ISGF3/STAT3 transcriptional switch.","method":"Genome-wide RNAi screen, Co-immunoprecipitation, ChIP, siRNA knockdown","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide screen followed by Co-IP, ChIP, and functional validation; multiple orthogonal methods","pmids":["22783022"],"is_preprint":false},{"year":2016,"finding":"MeCP2 interacts with SIN3A; haploinsufficiency of SIN3A in vivo causes reduced cortical neurogenesis, altered neuronal identity, and aberrant corticocortical projections in the developing mouse brain following knockdown.","method":"In vivo functional knockdown (mouse), immunofluorescence, neuronal projection analysis","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockdown with defined cellular phenotypes; genetic haploinsufficiency data","pmids":["27399968"],"is_preprint":false},{"year":2005,"finding":"Ebp1 interacts directly with Sin3A (C-terminal domain of Ebp1 with PAH4/HID domain of Sin3A); both Ebp1 and Sin3A co-occupy the PSA and E2F1 promoters; Sin3A enhances Ebp1-mediated repression of androgen receptor and E2F1-regulated genes.","method":"GST pulldown, Co-immunoprecipitation, ChIP, reporter assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro binding plus Co-IP, ChIP, and functional reporter assay; single lab","pmids":["16254079"],"is_preprint":false},{"year":2004,"finding":"Only a small, unstable fraction of MeCP2 interacts with Sin3A; purified rat brain MeCP2 behaves as an elongated monomer (~53 kDa) with no stably associated proteins, indicating MeCP2 is not an obligate Sin3A complex component.","method":"Size-exclusion chromatography, biophysical analysis (sedimentation), Co-immunoprecipitation from multiple tissues","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — biophysical and biochemical analyses across multiple tissues/species; negative finding for stable complex","pmids":["15322089"],"is_preprint":false},{"year":2007,"finding":"AHPN/3-Cl-AHPC binds to the orphan nuclear receptor SHP, promoting SHP interaction with a corepressor complex containing Sin3A, N-CoR, HDAC4, and HSP90; formation of the SHP-Sin3A complex is essential for AHPN/3-Cl-AHPC-induced apoptosis, as SHP knockout or Sin3A knockdown compromises proapoptotic activity.","method":"Ligand-binding assay, Co-immunoprecipitation, siRNA/KO knockdown, apoptosis assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus genetic KO and knockdown with functional readout; single lab","pmids":["17210713"],"is_preprint":false},{"year":2011,"finding":"The NMR solution structure of the mSin3A PAH3 domain complexed with the SAP30 Sin3-interaction domain (SID) was determined; PAH3 adopts a left-handed four-helix bundle; SAP30 SID binds via a tripartite motif to an interface of ~1400 Ų, accounting for constitutive association. The PAH3-SAP30 SID complex can bind nucleic acids, suggesting a role in targeting the complex to ribosomal RNA genes.","method":"NMR spectroscopy, solution structure determination, nucleic acid binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR solution structure with functional nucleic acid binding validation","pmids":["21676866"],"is_preprint":false},{"year":2006,"finding":"SAP30L binds to the PAH3/HID region of Sin3A via residues 120–140, recruits Sin3A to the nucleolus via a functional nucleolar localization signal, and induces transcriptional repression; SAP30 also targets Sin3A to the nucleolus.","method":"Co-immunoprecipitation, deletion mapping, reporter assay, subcellular localization imaging","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP domain mapping, functional reporter, and localization imaging; single lab","pmids":["16820529"],"is_preprint":false},{"year":2004,"finding":"The highly conserved region (HCR) of Sin3A, spanning ~134 amino acids and sharing >80% identity with Sin3B, interacts with the N-terminus of the corepressor Alien; this interaction is demonstrated both in vivo by ChIP (at the CYP24 promoter) and in vitro; HCR overexpression inhibits Alien-mediated repression and induces endogenous CYP24 expression.","method":"Co-immunoprecipitation, ChIP, reporter assay, GST pulldown","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, and functional reporter; two orthogonal approaches; single lab","pmids":["15173382"],"is_preprint":false},{"year":2003,"finding":"The SIN3 interaction domain (SID) of Mad-family repressors and KLF proteins bind differentially to the PAH2 domain of Sin3A; computational and experimental analyses show two SID subtypes exhibit distinct PAH2 binding modes, providing structural insight into selective corepressor recruitment.","method":"Computational modeling, binding assays","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — computational plus limited experimental binding data; single lab, single study","pmids":["12885416"],"is_preprint":false},{"year":2006,"finding":"The apo PAH2 domain of mSin3A is monomeric and folded at low micromolar concentrations but dimerizes at higher concentrations with concomitant partial unfolding, in contrast to mSin3B PAH2 behavior, suggesting paralog-specific structural differences relevant to coregulator interactions.","method":"NMR spectroscopy, analytical ultracentrifugation, biophysical analysis","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — NMR and biophysical characterization; single lab, rigorous structural methods","pmids":["16813833"],"is_preprint":false},{"year":2011,"finding":"Sin3A interacts with c-Myc and causes deacetylation of c-Myc protein, directly repressing c-Myc activity; in the absence of Sin3A, c-Myc genomic recruitment to the epidermal differentiation complex is enhanced; simultaneous deletion of c-Myc and Sin3A reverts the aberrant skin phenotype, establishing a negative feedback loop.","method":"Conditional knockout mouse, ChIP, Co-immunoprecipitation, epistasis (double knockout rescue)","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (double KO rescue), ChIP, and Co-IP across multiple orthogonal methods","pmids":["22101514"],"is_preprint":false},{"year":2011,"finding":"Sin3a-null embryos suffer unresolved DNA damage and acute apoptosis specifically in the epiblast; Myc and E2F targets are downregulated in Sin3a-null ICMs; ES cells deleted for Sin3a show DNA double-strand break response, G2 arrest, and apoptosis, establishing Sin3a as essential for genomic integrity of pluripotent cells.","method":"Conditional knockout mouse, ES cell deletion, γH2AX staining, cell cycle analysis, gene expression profiling","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple in vivo and in vitro genetic deletion models with mechanistic cellular readouts","pmids":["22206758"],"is_preprint":false},{"year":2017,"finding":"FOXN3 is physically associated with the SIN3A repressor complex in ER+ cells; the lncRNA NEAT1 is required for FOXN3 interactions with the SIN3A complex (shown by RNA immunoprecipitation); the FOXN3-NEAT1-SIN3A complex represses GATA3 and ER (ESR1) genes, forming a negative-feedback loop; NEAT1 is identified as a facultative component of the SIN3A complex.","method":"RNA immunoprecipitation-sequencing, ChIP-seq, Co-immunoprecipitation, in vitro/in vivo functional studies","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — RIP-seq, ChIP-seq, and Co-IP with functional in vitro and in vivo validation; multiple orthogonal methods","pmids":["28805661"],"is_preprint":false},{"year":2018,"finding":"LSD1 is an integral component of the SIN3A/HDAC complex; the LSD1/SIN3A/HDAC complex co-targets genes in p53 signaling and other pathways as shown by ChIP-on-chip; LSD1 and SIN3A coordinate to inhibit genes including CASP7, TGFB2, CDKN1A, HIF1A, TERT, and MDM2.","method":"Co-immunoprecipitation, ChIP-on-chip, siRNA knockdown","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP-on-chip; single lab, two orthogonal methods","pmids":["29741645"],"is_preprint":false},{"year":2018,"finding":"Sin3a interacts with Tet1 via a highly conserved SID in the PAH1 domain; two residues (Phe147, Phe182) in PAH1 are essential for Sin3a-Tet1 interaction; Sin3a-Tet1 complex activates transcription of Lefty1 and other target genes by promoting promoter DNA demethylation; this activity is required for ESC pluripotency.","method":"NMR spectroscopy, co-immunoprecipitation, ChIP-seq, MeDIP-seq, site-directed mutagenesis, reporter assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structural analysis, mutagenesis of interface residues, ChIP-seq, and DNA methylation sequencing in a single rigorous study","pmids":["29733394"],"is_preprint":false},{"year":2018,"finding":"Tet1 contains a conserved SID that inserts into the PAH1 domain of Sin3A in a Type-II orientation similar to Sap25; mutagenesis of key SID residues abolishes the interaction and is absolutely required for Tet1 to repress transcription in cells.","method":"NMR spectroscopy, homology modelling, mutagenesis, Co-immunoprecipitation, transcription reporter assay","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR-based structural model combined with mutagenesis and functional transcription assay","pmids":["30279502"],"is_preprint":false},{"year":2014,"finding":"CRL4B (CUL4B-containing ubiquitin ligase) physically interacts with the SIN3A-HDAC complex and co-occupies CDKN1A and CDKN1C promoters; CUL4B loss reduces SIN3A-HDAC retention on promoters, increases histone acetylation, and upregulates p21 and p57; the ubiquitylation function of CRL4B is not required for stable SIN3A-HDAC retention.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, histone acetylation assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP with functional readout; key mutagenesis control (ubiquitylation-dead mutant); single lab","pmids":["25189618"],"is_preprint":false},{"year":2017,"finding":"Sin3a is required for Sin3A/HDAC2 complex function in lung endoderm; loss of Sin3a in mouse early foregut endoderm causes embryonic lung epithelial progenitor cells to adopt a senescence-like state with permanent G1 arrest, mediated at least partially through upregulation of Cdkn1a and Cdkn2c; loss also disrupts epithelial-mesenchymal signaling.","method":"Conditional knockout mouse, cell cycle analysis, gene expression profiling","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined molecular mechanism (CDK inhibitor upregulation); single lab","pmids":["28619823"],"is_preprint":false},{"year":2010,"finding":"Sertoli cell-specific deletion of Sin3a reduces undifferentiated spermatogonia (Plzf, Gfra1, Oct4 markers downregulated), disrupts CXCL12/SDF1 and CXCR4 signaling, causes progressive spermatogenic failure, and suppresses teratoma formation from fetal germ cells in transplantation assays, establishing a non-cell-autonomous epigenetic role for Sin3a in niche function.","method":"Conditional knockout mouse (Sertoli-specific), marker analysis, transplantation assay","journal":"Stem cells (Dayton, Ohio)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic conditional KO with defined phenotypic and molecular readouts; single lab","pmids":["20572009"],"is_preprint":false},{"year":2014,"finding":"Sin3a-associated Hdac1 and Hdac2 control hematopoietic stem cell homeostasis cell-autonomously; bone-marrow-specific deletion of Sin3a phenocopies loss of Hdac1/2, causing bone marrow failure, establishing that Sin3a-associated HDAC1/2 activity is essential for HSC homeostasis.","method":"Conditional knockout mouse (bone marrow specific), HSPC analysis, phenotypic rescue","journal":"Haematologica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via phenocopy of double Hdac1/2 KO by Sin3a KO; single lab","pmids":["24763403"],"is_preprint":false},{"year":2011,"finding":"Gon4l interacts with YY1, Sin3a, and HDAC1 as components of a single complex in mouse B cells (demonstrated by sequential immunoprecipitation); a conserved central domain of Gon4l is required for this complex assembly; Gon4l represses promoter activity in a manner correlated with its ability to interact with Sin3a and HDAC1.","method":"Co-immunoprecipitation, sequential immunoprecipitation, density gradient sedimentation, reporter assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — sequential Co-IP establishing single complex plus functional reporter; single lab","pmids":["21454521"],"is_preprint":false},{"year":2009,"finding":"Mohawk recruits components of the Sin3A/HDAC co-repressor complex (Sin3A, Hdac1, Sap18) and a subset of general transcription factors; MRD1 (one of three repressor domains in Mohawk) is co-immunoprecipitated by Sap18; Mohawk represses target genes required for myogenic differentiation through this mechanism.","method":"Co-immunoprecipitation, point mutation analysis, reporter assay","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP domain mapping with point mutation analysis and functional reporter; single lab","pmids":["19235719"],"is_preprint":false},{"year":2008,"finding":"T-bet-dependent removal of HDAC-Sin3A complexes from the Ifng locus drives H4 acetylation accumulation and Th1 differentiation; in Th0 cells, HDAC-Sin3A complexes actively prevent H4 acetylation; loss of HDAC-Sin3A occurs during Th1 lineage commitment through T-bet-dependent mechanisms.","method":"ChIP, T-bet genetic analysis, Th1/Th0 differentiation assays","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating T-bet-dependent removal; genetic pathway placement; single lab","pmids":["19050254"],"is_preprint":false},{"year":2010,"finding":"Sumoylation of ING2 at lysine 195 by SUMO1 enhances its association with Sin3a; sumoylated ING2 is required for Sin3A/HDAC complex recruitment to target gene promoters (e.g., TMEM71) and for regulation of their transcription.","method":"In vitro sumoylation assay, Co-immunoprecipitation, ChIP, reporter assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo sumoylation assays with Co-IP and ChIP; single lab","pmids":["20676127"],"is_preprint":false},{"year":2008,"finding":"PKCα/ERK signaling causes Sp1 phosphorylation, which leads to dissociation of the HDAC1/mSin3A repressor complex from Sp1 binding sites on the LHR promoter, histone H3 acetylation, and derepression of LHR transcription.","method":"Co-immunoprecipitation, ChIP, kinase inhibition, dominant-negative overexpression","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and Co-IP with pharmacological and genetic manipulation; single lab, two orthogonal methods","pmids":["18372343"],"is_preprint":false},{"year":2001,"finding":"TGIF directly interacts with Sin3A, thereby recruiting HDAC1 to androgen receptor (AR)-responsive promoters to repress AR-mediated transcription; this repression is TSA-sensitive and TGIF binds the DNA-binding domain of AR.","method":"Co-immunoprecipitation, reporter assay, TSA inhibition","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional reporter with pharmacological inhibition; single lab","pmids":["11682623"],"is_preprint":false},{"year":2019,"finding":"STAT3 is constitutively acetylated in NPM-ALK+ ALCL cells; acetylated STAT3 constitutively binds the Sin3A complex and together occupies promoters of silenced tumor suppressor genes; SIN3A silencing causes re-expression of TSGs and induces ALCL apoptosis in vitro and reduces tumorigenic potential in vivo. STAT3-Sin3A association was also found in breast adenocarcinoma cells.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, in vivo xenograft, resveratrol pharmacology","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP with in vivo validation; single lab, two cell model systems","pmids":["30692217"],"is_preprint":false},{"year":2017,"finding":"ARID1A directly causes suppression of TERT expression and co-occupies the TERT promoter with the SIN3A repressor complex during retinoic acid-induced neuroblastoma differentiation; SIN3A co-occupancy is required for ARID1A-dependent TERT repression.","method":"ChIP-qPCR, TERT expression analysis, telomeric repeat amplification protocol, immunoblot","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-qPCR and functional assays; single lab","pmids":["31365169"],"is_preprint":false},{"year":2014,"finding":"SIN3A is required for transcriptional induction of CYP1A1 by TCDD (aryl hydrocarbon receptor ligand); TCDD treatment increases SIN3A binding to both the proximal promoter and enhancer of Cyp1a1; ectopic human SIN3A rescues TCDD-induced EROD activity in Sin3A-depleted cells, establishing a positive (activating) role for SIN3A at an AhR target gene.","method":"siRNA knockdown, ectopic expression rescue, ChIP, EROD enzyme assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with rescue by ectopic SIN3A plus ChIP; single lab, two orthogonal methods","pmids":["25305016"],"is_preprint":false},{"year":2017,"finding":"Fam60a defines a variant Sin3a-Hdac complex present in ES cells that additionally contains Ogt and Tet1; Fam60a is essential for maintaining the complex on chromatin at H3K4me3-positive promoters; depletion of Fam60a phenocopies loss of Sin3a (reduced proliferation, extended G1, deregulation of lineage genes).","method":"Tandem endogenous immunoprecipitation with quantitative mass spectrometry, ChIP-seq, siRNA knockdown, phenotypic analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — novel proteomic method for complex composition combined with ChIP-seq and genetic phenocopy; multiple orthogonal methods","pmids":["28554894"],"is_preprint":false},{"year":2018,"finding":"The HDAC2/Sin3A/MeCP2 corepressor complex acts as an endogenous inhibitor of CTGF at the CTGF promoter; ET-1 disrupts this complex through MAP kinase-mediated HDAC2 phosphorylation, releasing HDAC2/Sin3A/MeCP2 from the CTGF promoter and allowing AP-1-driven CTGF expression.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, overexpression, kinase inhibitors","journal":"Journal of biomedical science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP with pharmacological and genetic dissection; single lab","pmids":["37312162"],"is_preprint":false},{"year":2017,"finding":"HDAC2 and cofactor Sin3A deacetylate histones H3K14ac and H3K27ac at the ASS1 promoter during arginine starvation, facilitating PHD2-driven HIF-1α proteasomal degradation at the promoter and enabling ASS1 derepression.","method":"ChIP, Co-immunoprecipitation, knockdown, proteasome inhibitor studies","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and Co-IP with pharmacological dissection; single lab, novel chromatin-linked proteolysis mechanism","pmids":["28883660"],"is_preprint":false},{"year":2020,"finding":"Sin3A regulates hippocampal synaptic plasticity and long-term memory: postnatal neuronal deletion of Sin3a enhances hippocampal LTP and contextual fear memory; Sin3A loss increases Homer1 expression, alters mGluR1α and mGluR5 dependence of LTP, and increases ERK activation after learning.","method":"Conditional knockout mouse, electrophysiology (LTP), fear conditioning, ChIP, gene expression analysis","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional neuronal KO with electrophysiological and behavioral readouts plus molecular pathway identification (Homer1/mGluR); multiple orthogonal methods","pmids":["32069266"],"is_preprint":false},{"year":2024,"finding":"SIN3A complex histone deacetylase activity protects stalled replication forks from MUS81 endonuclease-mediated cleavage; Sin3A is enriched at replicating DNA under hydroxyurea treatment; Sin3A-depleted cells show increased replication fork stalling, H3 acetylation at stalled forks, MRE11-dependent DNA degradation, and impaired fork recovery—effects partially dependent on MUS81.","method":"iPOND (isolation of proteins on nascent DNA), ChIP, DNA fiber assays, siRNA knockdown, genetic epistasis (MUS81 co-depletion)","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (iPOND, ChIP, DNA fiber) with genetic epistasis establishing MUS81-dependent mechanism; rigorous study","pmids":["38341854"],"is_preprint":false},{"year":2023,"finding":"Nuclear complement C3b physically associates with the HDAC1/2-containing SIN3A complex; this interaction enhances SIN3A complex binding to the GADD45A promoter, reducing H3 acetylation and repressing GADD45A expression, thereby promoting paclitaxel resistance in NSCLC.","method":"Co-immunoprecipitation, ChIP, nuclear fractionation, siRNA knockdown, ectopic expression","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP with functional knockdown/overexpression studies; single lab","pmids":["37291119"],"is_preprint":false},{"year":2019,"finding":"Sin3a regulates the developmental progression through the morula-to-blastocyst transition via Hdac1: Sin3a depletion increases Trp53 acetylation (K379), reduces Cdx2 and Nanog, causes global DNA hypermethylation via increased nuclear DNMT1, and downregulates Hdac1; exogenous Hdac1 but not Hdac2 rescues the block.","method":"siRNA knockdown in mouse embryos, RNA-seq, Western blot, immunofluorescence, rescue by Hdac1 mRNA injection","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific Hdac1 rescue distinguishes paralog requirement; RNA-seq and molecular assays; single lab","pmids":["31450981"],"is_preprint":false},{"year":2023,"finding":"Tet2 recruits Sin3a to active enhancers in ESCs; Tet2 deficiency diminishes Sin3a at active enhancers and promoters; combined Tet1/2 loss (but not loss of their catalytic activities alone) reduces Sin3a at active enhancers, showing that Tet1/2 noncatalytic functions recruit Sin3a.","method":"ChIP-seq, Tet2 catalytic mutant and KO ESCs, Co-immunoprecipitation","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq and catalytic-dead mutant genetic dissection; single lab, two orthogonal methods","pmids":["37456851"],"is_preprint":false},{"year":2018,"finding":"SINHCAF/FAM60A links the SIN3A-HDAC complex to the hypoxia response by specifically repressing HIF-2α mRNA and protein expression; SINHCAF interacts with SP1 and recruits HDAC1 to the HIF-2α promoter to mediate this repression.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, angiogenesis assays","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP with functional knockdown; single lab, two orthogonal methods","pmids":["29784889"],"is_preprint":false},{"year":2015,"finding":"Disruption of the SIN3A PAH2 domain interaction with PF1 (PHF12/SID-containing adaptor) using a competitive Tat-SID peptide blocks EMT and stem cell marker expression in TNBC; KLF9 is recruited to ITGA6 and ITGB1 promoters by SIN3A and mediates their repression; KLF9 knockdown re-establishes invasion.","method":"Peptide competition (Tat-SID), Co-immunoprecipitation, ChIP, siRNA knockdown, in vitro and in vivo invasion assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP with functional peptide competition and genetic rescue; single lab","pmids":["26460951"],"is_preprint":false},{"year":2013,"finding":"BIM is epigenetically silenced in NPM/ALK+ ALCL through recruitment of MeCP2 and the SIN3a/HDAC1/2 corepressor complex to the BIM locus; CpG methylation is required for MeCP2 corepressor complex recruitment; demethylation with 5-azacytidine detaches the complex and reacetylates histone tails.","method":"ChIP, DNA methylation analysis (5-azacytidine treatment), histone acetylation assays, siRNA knockdown","journal":"Neoplasia (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with pharmacological and genetic manipulation; single lab","pmids":["23633923"],"is_preprint":false},{"year":2011,"finding":"Sin3A couples with MeCP2 at the GFAP promoter to suppress GFAP transcription; upon astrocyte differentiation, Sin3A-MeCP2 depart from the promoter coincident with STAT3 binding, CBP/p300 recruitment, and histone H3K9/K14 acetylation that drives GFAP expression.","method":"ChIP, immunofluorescence, siRNA knockdown, reporter assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and co-occupancy data with functional knockdown; single lab","pmids":["21779366"],"is_preprint":false},{"year":2022,"finding":"Sin3A functions as a transcriptional coactivator cooperating with Tet1 to facilitate hydroxymethylation of epithelial gene promoters; disrupting the Sin3a-Tet1 interaction (via PAH1 mutants) significantly blocks mesenchymal-to-epithelial transition and iPSC generation.","method":"Co-immunoprecipitation, ChIP, hydroxymethylated DNA immunoprecipitation (hMeDIP), site-directed mutagenesis, RNA-seq","journal":"Stem cell research & therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and epigenomic sequencing with mutagenesis; single lab, corroborates prior Zhu et al. 2018 study","pmids":["35073971"],"is_preprint":false},{"year":2020,"finding":"SIN3A loss in pancreatic β-cells compromises survival, insulin-vesicle packaging, insulin secretion, and nutrient-induced Ca2+ influx; ChIP assays identify direct Sin3a target genes in β-cells modulating Ca2+/ion transport, cell survival, vesicle trafficking, and glucose metabolism.","method":"Conditional knockout mouse (endocrine progenitor), RNA-seq, ChIP, calcium imaging, insulin secretion assays","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with multiple physiological and molecular readouts; ChIP confirms direct targets; rigorous multi-method study","pmids":["32245798"],"is_preprint":false},{"year":2021,"finding":"SIN3A depletion in porcine early embryos reduces CCNB1 (Cyclin B1) transcript levels and causes two-cell stage arrest; injection of CCNB1 mRNA partially rescues SIN3A-depleted embryos, establishing SIN3A regulation of CCNB1 as a key mechanism in porcine embryonic development.","method":"siRNA knockdown, RNA-seq, mRNA rescue injection, immunofluorescence","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-seq identification combined with specific mRNA rescue; single lab","pmids":["33692994"],"is_preprint":false},{"year":2023,"finding":"Sin3A-deficient CD4+ T cells fail to properly upregulate Il17a, Il23r, and Il22 under Th17 skewing conditions; instead, IL-2+ and FOXP3+ cells accumulate; Sin3A deletion causes overt STAT3 activation, aberrant cytoplasmic RORγt accumulation, and enrichment of mTORC1 signaling genes.","method":"Conditional knockout mouse (CD4-Cre), flow cytometry, cytokine assays, gene expression analysis","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined molecular pathway placement (STAT3, RORγt, mTORC1); single lab","pmids":["36929576"],"is_preprint":false},{"year":1996,"finding":"Mouse Sin3A physically associates with the strong repressive isoform of Mxi1 (Mxi1-SR); a mSin3A-Mxi1 fusion protein in which the mSin3-interacting domain of Mxi1 is replaced by full-length mSin3A exhibits repression equivalent to Mxi1-SR, demonstrating that the Mxi1 N-terminal repression domain functions solely to recruit mSin3A.","method":"Co-immunoprecipitation, fusion protein repression assay, transformation assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional fusion protein rescue demonstrating sufficiency; single lab","pmids":["8649810"],"is_preprint":false},{"year":2004,"finding":"Chick Dach1 interacts with the Smad complex and the corepressor Sin3a, acting as a repressor of BMP-mediated transcriptional control; this interaction regulates apical ectodermal ridge formation and proximodistal patterning in the limb.","method":"Co-immunoprecipitation, in vivo limb functional assays","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and in vivo developmental phenotype; single lab","pmids":["15280207"],"is_preprint":false},{"year":2012,"finding":"Sin3a is required in the male germline for mitotic reentry of gonocytes; germline genetic inactivation of Sin3a causes rapid depletion of gonocytes coincident with cell cycle reentry, 2.5-fold increased histone H3 phosphorylation, prophase/metaphase block, near-complete germ cell loss, and altered Sertoli cell expression programs.","method":"Conditional knockout mouse (germline), histone phosphorylation analysis, gene expression profiling","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined cell cycle and molecular readouts; single lab","pmids":["22820070"],"is_preprint":false},{"year":2021,"finding":"ZBTB25 and Sin3A associate with the HDAC1 silencing complex and are recruited to the IL-12B promoter in M. tuberculosis-infected macrophages to downregulate IL-12B expression; ZBTB25 knockdown prevents complex recruitment and enhances IL-12p40 release.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, cytokine assays","journal":"mSphere","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP with functional siRNA knockdown; single lab","pmids":["33627504"],"is_preprint":false}],"current_model":"SIN3A is an evolutionarily conserved scaffold protein that nucleates a large histone deacetylase (HDAC1/2)-containing co-repressor complex; it uses four paired amphipathic helix (PAH) domains—structurally defined by NMR—as docking platforms for diverse transcription factors and co-regulators (Mad/Mxi, MBD2b, SAP30/SAP30L via PAH3, PSF, REST, Snail, Ebp1, TGIF, Alien/HCR, and Tet1 via PAH1), recruiting HDAC activity to specific gene promoters to deacetylate histones and repress transcription; SIN3A is itself regulated by post-translational events on its partners (e.g., PRMT1 methylation of RUNX1 abrogates SIN3A binding, PKCα/ERK-mediated Sp1 phosphorylation releases the complex from promoters, SUMO1 modification of ING2 enhances SIN3A association); paradoxically, SIN3A also acts as a transcriptional co-activator in select contexts by interacting with Tet1/Tet2 to promote DNA demethylation at target gene promoters and by facilitating AhR-induced CYP1A1 transcription; beyond transcription, the SIN3A-HDAC complex protects stalled DNA replication forks from MUS81 endonuclease cleavage by maintaining chromatin deacetylation; SIN3A suppresses co-transcriptional R-loops through physical interaction with the THO/TREX complex; and haploinsufficiency of SIN3A in humans causes Witteveen-Kolk syndrome, characterized by intellectual disability, microcephaly, and cortical developmental abnormalities, reflecting its essential role—demonstrated in multiple conditional knockout mouse models—in hematopoiesis, spermatogenesis, β-cell function, lung endoderm specification, and neuronal plasticity."},"narrative":{"mechanistic_narrative":"SIN3A is an evolutionarily conserved scaffold that nucleates a histone deacetylase (HDAC1/2) co-repressor complex and is recruited to specific promoters by a wide array of sequence-specific transcription factors and adaptors, where it enforces histone deacetylation and transcriptional silencing [PMID:10491605, PMID:22101514, PMID:24763403]. Recruitment occurs through SIN3A's paired amphipathic helix (PAH) domains, which serve as modular docking platforms: PAH2 binds the SIN3-interaction domains of Mad/Mxi1-family and KLF repressors and the PF1/PHF12 adaptor [PMID:16813833, PMID:26460951, PMID:8649810], PAH3/HID binds MBD2b and the constitutively associated SAP30/SAP30L subunits—the latter targeting the complex to the nucleolus—with the PAH3–SAP30 interface defined at atomic resolution by NMR [PMID:10950960, PMID:21676866, PMID:16820529], and PAH1 docks Tet1 via a conserved SID whose interface residues are required for function [PMID:29733394, PMID:30279502]. Through these contacts SIN3A is delivered to chromatin by repressors and adaptors including Snail, REST, PSF, Ebp1, TGIF, Alien/HCR, BMP-Smad effectors, Gon4l, Mohawk, and MeCP2, and its targeting and release are controlled by post-translational events on its partners, such as PRMT1 methylation of RUNX1 that abolishes SIN3A binding and PKCα/ERK-driven Sp1 phosphorylation that evicts the complex from promoters [PMID:14673164, PMID:10491605, PMID:11259580, PMID:18316480, PMID:18372343]. SIN3A also deacetylates non-histone substrates including c-Myc and STAT3, forming negative-feedback circuits that restrain their activity [PMID:22101514, PMID:22783022]. Paradoxically, SIN3A functions as a co-activator when partnered with Tet1/Tet2, promoting promoter DNA demethylation/hydroxymethylation to activate target genes and to support ESC pluripotency and reprogramming [PMID:29733394, PMID:37456851, PMID:35073971]. Beyond transcription, the SIN3A–HDAC complex maintains genome integrity: it suppresses co-transcriptional R-loops through physical interaction with the THO/TREX complex and protects stalled replication forks from MUS81-mediated cleavage by keeping nascent chromatin deacetylated [PMID:29074626, PMID:38341854]. SIN3A is essential in vivo for pluripotent-cell genomic integrity, hematopoietic stem cell homeostasis, spermatogenesis, lung endoderm specification, β-cell function, and neuronal plasticity and memory [PMID:22206758, PMID:24763403, PMID:22820070, PMID:28619823, PMID:32245798, PMID:32069266].","teleology":[{"year":1996,"claim":"Established that a transcriptional repressor's silencing activity can be reduced to its capacity to recruit SIN3A, defining SIN3A as the functional repression module downstream of Mad/Mxi1 factors.","evidence":"Co-IP and fusion-protein repression/transformation assays with Mxi1 in mouse cells","pmids":["8649810"],"confidence":"Medium","gaps":["Did not resolve how SIN3A connects to deacetylase enzymatic activity","Single repressor system"]},{"year":1999,"claim":"Showed SIN3A links DNA-bound repressors to HDAC activity at native gene promoters, providing the first promoter-level mechanism for RE1/NRSE silencing of neuronal genes.","evidence":"Co-IP, reporter and promoter occupancy assays with REST on GluR2 and sodium channel genes","pmids":["10491605"],"confidence":"High","gaps":["Domain of SIN3A engaged by REST not mapped","HDAC catalytic dependence inferred pharmacologically"]},{"year":2000,"claim":"Identified the PAH domains as discrete partner-docking surfaces, mapping methyl-CpG reader MBD2b to PAH3.","evidence":"GST pulldown, Co-IP, deletion mapping","pmids":["10950960"],"confidence":"Medium","gaps":["No structural detail of the interface","Single adaptor"]},{"year":2003,"claim":"Defined PAH2 as a selectively recognized interface with distinct SID binding modes, explaining how different repressor classes are differentially recruited.","evidence":"Computational modeling plus binding assays of Mad-family and KLF SIDs","pmids":["12885416"],"confidence":"Low","gaps":["Primarily computational with limited experimental binding data","No high-resolution complex structure"]},{"year":2004,"claim":"Extended SIN3A recruitment to developmental and EMT contexts, showing Snail and BMP-Smad/Dach1 effectors deliver the HDAC–SIN3A complex to target promoters.","evidence":"Co-IP, ChIP, TSA inhibition (Snail/E-cadherin) and in vivo limb assays (Dach1/Smad)","pmids":["14673164","15280207"],"confidence":"High","gaps":["Promoter-specificity determinants not defined","Interface mapping on SIN3A absent"]},{"year":2006,"claim":"Mapped the SAP30/SAP30L constitutive subunits to the PAH3/HID region and showed they direct SIN3A to the nucleolus, linking the complex to rRNA-gene loci.","evidence":"Co-IP, deletion mapping, NLS analysis, localization imaging and biophysical NMR/AUC of PAH2","pmids":["16820529","16813833"],"confidence":"Medium","gaps":["Functional consequences at rDNA not directly demonstrated","Paralog-specific PAH2 behavior of unclear in vivo relevance"]},{"year":2008,"claim":"Demonstrated that post-translational modification of SIN3A partners acts as a switch controlling complex assembly and promoter occupancy.","evidence":"Mass spectrometry, methyl-arginine antibodies, Co-IP/ChIP (PRMT1–RUNX1) and ChIP/Co-IP with kinase inhibition (Sp1)","pmids":["18316480","18372343"],"confidence":"High","gaps":["Whether SIN3A itself is modified not addressed","Generalizability across other partners untested"]},{"year":2011,"claim":"Revealed atomic-resolution recognition (PAH3–SAP30 SID) and established SIN3A as a deacetylase of non-histone substrates with tumor-suppressive feedback roles.","evidence":"NMR solution structure with nucleic-acid binding; conditional KO, ChIP, Co-IP and double-KO epistasis (c-Myc)","pmids":["21676866","22101514"],"confidence":"High","gaps":["How non-histone deacetylation is targeted in vivo unclear","Structures of other PAH–SID complexes lacking"]},{"year":2011,"claim":"Established SIN3A as essential for genomic integrity of pluripotent cells, connecting transcriptional control to DNA damage avoidance.","evidence":"Conditional KO mouse and ES-cell deletion with γH2AX, cell-cycle and expression profiling","pmids":["22206758"],"confidence":"High","gaps":["Direct molecular link between SIN3A loss and DSB formation not resolved","Distinguishing transcriptional vs. replicative cause"]},{"year":2012,"claim":"Defined SIN3A as a context-dependent signaling switch that deacetylates STAT3 and gates interferon/STAT transcriptional output.","evidence":"Genome-wide RNAi screen, Co-IP, ChIP, siRNA","pmids":["22783022"],"confidence":"High","gaps":["Mechanism of substrate selection (STAT3 vs ISGF3 components) unclear","Direct vs indirect deacetylation"]},{"year":2017,"claim":"Connected the SIN3A–HDAC complex to genome stability via the THO/TREX complex, showing it suppresses co-transcriptional R-loops by maintaining deacetylation.","evidence":"Reciprocal Co-IP, siRNA, DRIP, immunofluorescence, replication fork assays","pmids":["29074626"],"confidence":"High","gaps":["How deacetylation mechanistically prevents R-loops not resolved","Direct THO subunit contact on SIN3A not mapped"]},{"year":2017,"claim":"Identified compositionally distinct, lineage-specialized SIN3A complexes (FAM60A/SINHCAF-containing) that incorporate OGT/Tet1 and target H3K4me3 promoters and the hypoxia response.","evidence":"Tandem endogenous IP with quantitative MS, ChIP-seq, siRNA phenocopy; Co-IP/ChIP for HIF-2α","pmids":["28554894","29784889"],"confidence":"High","gaps":["Full catalog of variant complexes incomplete","How FAM60A retains the complex on chromatin mechanistically unclear"]},{"year":2018,"claim":"Resolved the PAH1–Tet1 SID interface and established a co-activator mode of SIN3A in which Tet1/2 partnership promotes DNA demethylation to activate genes and sustain pluripotency.","evidence":"NMR, mutagenesis of interface residues, Co-IP, ChIP-seq, MeDIP-seq, reporter assays","pmids":["29733394","30279502"],"confidence":"High","gaps":["How a single scaffold toggles between repressive and activating output unclear","Catalytic-independent Tet recruitment mechanism only partly defined"]},{"year":2020,"claim":"Demonstrated tissue-level physiological requirements for SIN3A in β-cell function and in hippocampal synaptic plasticity and memory, linking the scaffold to specific direct target programs.","evidence":"Conditional KO mice with RNA-seq, ChIP, calcium imaging/insulin secretion (β-cell); electrophysiology, behavior, ChIP (neuronal)","pmids":["32245798","32069266"],"confidence":"High","gaps":["Which partner factors recruit SIN3A to these tissue-specific targets unknown","Causal HDAC-substrate links per phenotype not fully dissected"]},{"year":2024,"claim":"Established a direct replication-fork-protective role for SIN3A-complex deacetylase activity, shielding stalled forks from MUS81 cleavage by keeping nascent chromatin deacetylated.","evidence":"iPOND, ChIP, DNA fiber assays, siRNA, MUS81 co-depletion epistasis","pmids":["38341854"],"confidence":"High","gaps":["How SIN3A is recruited specifically to stalled forks unclear","Relationship to its transcriptional role at the same loci undefined"]},{"year":null,"claim":"It remains unresolved what molecular logic determines whether SIN3A acts as a repressor versus a Tet-dependent co-activator at a given locus, and how the scaffold integrates its transcriptional, R-loop-suppressing, and fork-protective activities.","evidence":"No single study in the corpus reconciles the repressive and activating modes mechanistically","pmids":[],"confidence":"Medium","gaps":["No unifying model for repressor-to-coactivator switching","Determinants of variant-complex assembly across cell types incomplete","Structural basis of full PAH-domain partner selectivity not comprehensively defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,20,22,55]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[15,16,24,48]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[20,10]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,29]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,20,22]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[16,15]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,20,29]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,1,32]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[4,43,21]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[21,27,24,51]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,36,5]}],"complexes":["SIN3A-HDAC1/2 co-repressor complex","FAM60A/SINHCAF variant Sin3A-HDAC complex (with OGT, Tet1)","THO/TREX complex (physical partner)"],"partners":["HDAC1","HDAC2","SAP30","TET1","MECP2","STAT3","FAM60A","LSD1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96ST3","full_name":"Paired amphipathic helix protein Sin3a","aliases":["Histone deacetylase complex subunit Sin3a","Transcriptional corepressor Sin3a"],"length_aa":1273,"mass_kda":145.2,"function":"Acts as a transcriptional repressor. Corepressor for REST. Interacts with MXI1 to repress MYC responsive genes and antagonize MYC oncogenic activities. Also interacts with MXD1-MAX heterodimers to repress transcription by tethering SIN3A to DNA. Acts cooperatively with OGT to repress transcription in parallel with histone deacetylation. Involved in the control of the circadian rhythms. Required for the transcriptional repression of circadian target genes, such as PER1, mediated by the large PER complex through histone deacetylation. Cooperates with FOXK1 to regulate cell cycle progression probably by repressing cell cycle inhibitor genes expression (By similarity). Required for cortical neuron differentiation and callosal axon elongation (By similarity)","subcellular_location":"Nucleus; Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/Q96ST3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/SIN3A","classification":"Common Essential","n_dependent_lines":1127,"n_total_lines":1208,"dependency_fraction":0.9329470198675497},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HDAC1","stoichiometry":4.0},{"gene":"H2AFZ","stoichiometry":0.2},{"gene":"HDAC2","stoichiometry":0.2},{"gene":"PARP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SIN3A","total_profiled":1310},"omim":[{"mim_id":"620287","title":"TRANSMEMBRANE PROTEIN 71; TMEM71","url":"https://www.omim.org/entry/620287"},{"mim_id":"620016","title":"MAX DIMERIZATION PROTEIN 4; MXD4","url":"https://www.omim.org/entry/620016"},{"mim_id":"619664","title":"EF-HAND CALCIUM-BINDING DOMAIN-CONTAINING PROTEIN 6; EFCAB6","url":"https://www.omim.org/entry/619664"},{"mim_id":"619230","title":"SIN3A-ASSOCIATED PROTEIN, 25-KD; SAP25","url":"https://www.omim.org/entry/619230"},{"mim_id":"618645","title":"PHD FINGER PROTEIN 12; PHF12","url":"https://www.omim.org/entry/618645"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SIN3A"},"hgnc":{"alias_symbol":["KIAA0700","DKFZP434K2235"],"prev_symbol":[]},"alphafold":{"accession":"Q96ST3","domains":[{"cath_id":"1.20.1160.11","chopping":"122-206","consensus_level":"high","plddt":83.008,"start":122,"end":206},{"cath_id":"1.20.1160.11","chopping":"303-383","consensus_level":"high","plddt":79.9698,"start":303,"end":383},{"cath_id":"1.20.1160.11","chopping":"468-521","consensus_level":"high","plddt":89.0478,"start":468,"end":521},{"cath_id":"-","chopping":"603-728","consensus_level":"high","plddt":92.2514,"start":603,"end":728},{"cath_id":"-","chopping":"775-831_867-910_958-1081","consensus_level":"high","plddt":92.5534,"start":775,"end":1081},{"cath_id":"-","chopping":"1192-1265","consensus_level":"medium","plddt":81.1858,"start":1192,"end":1265}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96ST3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96ST3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96ST3-F1-predicted_aligned_error_v6.png","plddt_mean":68.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SIN3A","jax_strain_url":"https://www.jax.org/strain/search?query=SIN3A"},"sequence":{"accession":"Q96ST3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96ST3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96ST3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96ST3"}},"corpus_meta":[{"pmid":"14673164","id":"PMC_14673164","title":"Snail mediates E-cadherin repression by the recruitment of the Sin3A/histone deacetylase 1 (HDAC1)/HDAC2 complex.","date":"2004","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/14673164","citation_count":605,"is_preprint":false},{"pmid":"10491605","id":"PMC_10491605","title":"Transcriptional repression by REST: recruitment of Sin3A and histone deacetylase to neuronal genes.","date":"1999","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/10491605","citation_count":343,"is_preprint":false},{"pmid":"28805661","id":"PMC_28805661","title":"The FOXN3-NEAT1-SIN3A repressor complex promotes progression of hormonally responsive breast cancer.","date":"2017","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/28805661","citation_count":170,"is_preprint":false},{"pmid":"18316480","id":"PMC_18316480","title":"Methylation of RUNX1 by PRMT1 abrogates SIN3A binding and potentiates its transcriptional activity.","date":"2008","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/18316480","citation_count":158,"is_preprint":false},{"pmid":"11259580","id":"PMC_11259580","title":"PSF is a novel corepressor that mediates its effect through Sin3A and the DNA binding domain of nuclear hormone receptors.","date":"2001","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/11259580","citation_count":154,"is_preprint":false},{"pmid":"29074626","id":"PMC_29074626","title":"Human THO-Sin3A interaction reveals new mechanisms to prevent R-loops that cause genome instability.","date":"2017","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/29074626","citation_count":115,"is_preprint":false},{"pmid":"14612411","id":"PMC_14612411","title":"Smad-dependent recruitment of a histone deacetylase/Sin3A complex modulates the bone morphogenetic protein-dependent transcriptional repressor activity of Nkx3.2.","date":"2003","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/14612411","citation_count":88,"is_preprint":false},{"pmid":"10950960","id":"PMC_10950960","title":"The minimal repression domain of MBD2b overlaps with the methyl-CpG-binding domain and binds directly to Sin3A.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10950960","citation_count":85,"is_preprint":false},{"pmid":"24344258","id":"PMC_24344258","title":"Epstein-Barr virus nuclear antigen 3C binds to BATF/IRF4 or SPI1/IRF4 composite sites and recruits Sin3A to repress CDKN2A.","date":"2013","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/24344258","citation_count":84,"is_preprint":false},{"pmid":"29059365","id":"PMC_29059365","title":"The SIN3A histone deacetylase complex is required for a complete transcriptional response to hypoxia.","date":"2018","source":"Nucleic acids 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Transcriptional Activation and Repression.","date":"2019","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/31201166","citation_count":5,"is_preprint":false},{"pmid":"29764005","id":"PMC_29764005","title":"Identification of Novel Functional Variants of SIN3A and SRSF1 among Somatic Variants in Acute Myeloid Leukemia Patients.","date":"2018","source":"Molecules and cells","url":"https://pubmed.ncbi.nlm.nih.gov/29764005","citation_count":5,"is_preprint":false},{"pmid":"27622813","id":"PMC_27622813","title":"Pits, a protein interacting with Ttk69 and Sin3A, has links to histone deacetylation.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/27622813","citation_count":4,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49882,"output_tokens":13375,"usd":0.175135,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":25397,"output_tokens":5002,"usd":0.126018,"stage2_stop_reason":"end_turn"},"total_usd":0.301153,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2004,\n      \"finding\": \"Snail mediates E-cadherin repression by recruiting a complex containing HDAC1, HDAC2, and mSin3A via its SNAG domain; this interaction is SNAG domain-dependent and results in histone H3/H4 deacetylation at the E-cadherin promoter.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, TSA inhibitor experiments, overexpression studies\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, ChIP, and pharmacological inhibition in multiple cell lines establishing direct causal relationship\",\n      \"pmids\": [\"14673164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The N-terminal repression domain of REST recruits Sin3A and histone deacetylase to neuronal gene promoters (GluR2 and type II sodium channel) in nonneuronal cells, establishing a mechanism for RE1/NRSE-mediated silencing.\",\n      \"method\": \"Multiple co-immunoprecipitation, reporter assay, ChIP-like promoter analysis\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, functional assays) establishing mechanism; replicated across two gene targets\",\n      \"pmids\": [\"10491605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PRMT1 methylates RUNX1 at arginine residues R206 and R210, which lie within the SIN3A-interaction region of RUNX1; this methylation abrogates RUNX1-SIN3A association, converting RUNX1 from a repressor to an activator. shRNA against PRMT1 enhances RUNX1-SIN3A association.\",\n      \"method\": \"Mass spectrometry, methyl-arginine-specific antibody, Co-IP, shRNA knockdown, ChIP\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mass spectrometry identification of methylation sites, orthogonal antibody validation, functional rescue experiments, ChIP\",\n      \"pmids\": [\"18316480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PSF (polypyrimidine tract-binding protein-associated splicing factor) acts as a corepressor by interacting with Sin3A and mediating silencing through recruitment of HDACs to the DNA-binding domains of nuclear hormone receptors TR and RXR, independently of N-CoR/SMRT.\",\n      \"method\": \"Biochemical pulldown, Co-immunoprecipitation, in vivo transcription assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional transcription assays in single lab; novel pathway placement\",\n      \"pmids\": [\"11259580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Human THO complex physically interacts with the Sin3A histone deacetylase complex; this interaction suppresses co-transcriptional R-loop formation, DNA damage, and replication impairment. Depletion of either THO or Sin3A leads to histone hypo-acetylation, increased R-loop accumulation, and genomic instability.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, DNA-RNA hybrid detection (DRIP), replication fork assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus multiple functional assays (R-loop, DNA damage, replication) establishing physical and functional interaction\",\n      \"pmids\": [\"29074626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Nkx3.2 forms an in vivo complex with HDAC1 and Smad1/Smad4 in a BMP-dependent manner; recruitment of the HDAC/Sin3A complex to Nkx3.2 requires Smad1/4 interaction, establishing that BMP-Smads potentiate transcriptional repression through Sin3A.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay, dominant-negative Smad4 cell line rescue\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with genetic rescue in Smad4-deficient cells, single lab\",\n      \"pmids\": [\"14612411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"MBD2b binds directly to Sin3A; the minimal repression domain of MBD2b overlaps with its methyl-CpG-binding domain, and the interaction domain on Sin3A is the paired amphipathic helix 3 (PAH3) region.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation, deletion mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro binding assay and Co-IP with domain mapping; single lab\",\n      \"pmids\": [\"10950960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"EBNA3C physically interacts with Sin3A and recruits it to the CDKN2A (p14ARF) promoter through BATF/IRF4/SPI1/RUNX3 composite sites; conditional EBNA3C inactivation significantly decreased Sin3A binding at the p14ARF promoter, establishing Sin3A-mediated repression of p14ARF and p16INK4A.\",\n      \"method\": \"ChIP-seq, Co-immunoprecipitation, conditional inactivation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus Co-IP with conditional inactivation; single lab\",\n      \"pmids\": [\"24344258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SIN3A binds to promoters of hypoxia-repressed genes prior to hypoxia and participates in downregulation of 75% of hypoxia-repressed genes and induction of 47% of upregulated genes in endothelial cells; SIN3A occupancy is not altered by hypoxia itself but modulation of associated HDAC activity determines transcriptional output.\",\n      \"method\": \"siRNA knockdown, ChIP-seq, nascent RNA sequencing (4-thiouridine labeling)\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq and nascent transcriptomics with knockdown; single lab, two orthogonal methods\",\n      \"pmids\": [\"29059365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Estrogen-bound ERα recruits Sin3A to the proximal A promoter of ESR1, leading to loss of RNA polymerase II and repression; a direct estrogen-responsive interaction between Sin3A and ERα was identified; Sin3A siRNA knockdown specifically inhibits estrogen-induced repression of ESR1.\",\n      \"method\": \"ChIP, Co-immunoprecipitation, siRNA knockdown\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and Co-IP with RNAi functional validation; single lab\",\n      \"pmids\": [\"19620290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Sin3A directly interacts with STAT3, promotes STAT3 deacetylation, and is required for ISGF3-dependent (STAT1:STAT2:IRF9) gene transcription; Sin3A silencing results in prolonged nuclear retention of activated STAT3, enhanced STAT3 recruitment to the SOCS3 promoter, histone hyperacetylation, and enhanced STAT3-dependent transcription. Sin3A acts as a context-dependent ISGF3/STAT3 transcriptional switch.\",\n      \"method\": \"Genome-wide RNAi screen, Co-immunoprecipitation, ChIP, siRNA knockdown\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide screen followed by Co-IP, ChIP, and functional validation; multiple orthogonal methods\",\n      \"pmids\": [\"22783022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MeCP2 interacts with SIN3A; haploinsufficiency of SIN3A in vivo causes reduced cortical neurogenesis, altered neuronal identity, and aberrant corticocortical projections in the developing mouse brain following knockdown.\",\n      \"method\": \"In vivo functional knockdown (mouse), immunofluorescence, neuronal projection analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockdown with defined cellular phenotypes; genetic haploinsufficiency data\",\n      \"pmids\": [\"27399968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Ebp1 interacts directly with Sin3A (C-terminal domain of Ebp1 with PAH4/HID domain of Sin3A); both Ebp1 and Sin3A co-occupy the PSA and E2F1 promoters; Sin3A enhances Ebp1-mediated repression of androgen receptor and E2F1-regulated genes.\",\n      \"method\": \"GST pulldown, Co-immunoprecipitation, ChIP, reporter assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro binding plus Co-IP, ChIP, and functional reporter assay; single lab\",\n      \"pmids\": [\"16254079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Only a small, unstable fraction of MeCP2 interacts with Sin3A; purified rat brain MeCP2 behaves as an elongated monomer (~53 kDa) with no stably associated proteins, indicating MeCP2 is not an obligate Sin3A complex component.\",\n      \"method\": \"Size-exclusion chromatography, biophysical analysis (sedimentation), Co-immunoprecipitation from multiple tissues\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — biophysical and biochemical analyses across multiple tissues/species; negative finding for stable complex\",\n      \"pmids\": [\"15322089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"AHPN/3-Cl-AHPC binds to the orphan nuclear receptor SHP, promoting SHP interaction with a corepressor complex containing Sin3A, N-CoR, HDAC4, and HSP90; formation of the SHP-Sin3A complex is essential for AHPN/3-Cl-AHPC-induced apoptosis, as SHP knockout or Sin3A knockdown compromises proapoptotic activity.\",\n      \"method\": \"Ligand-binding assay, Co-immunoprecipitation, siRNA/KO knockdown, apoptosis assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus genetic KO and knockdown with functional readout; single lab\",\n      \"pmids\": [\"17210713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The NMR solution structure of the mSin3A PAH3 domain complexed with the SAP30 Sin3-interaction domain (SID) was determined; PAH3 adopts a left-handed four-helix bundle; SAP30 SID binds via a tripartite motif to an interface of ~1400 Ų, accounting for constitutive association. The PAH3-SAP30 SID complex can bind nucleic acids, suggesting a role in targeting the complex to ribosomal RNA genes.\",\n      \"method\": \"NMR spectroscopy, solution structure determination, nucleic acid binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR solution structure with functional nucleic acid binding validation\",\n      \"pmids\": [\"21676866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SAP30L binds to the PAH3/HID region of Sin3A via residues 120–140, recruits Sin3A to the nucleolus via a functional nucleolar localization signal, and induces transcriptional repression; SAP30 also targets Sin3A to the nucleolus.\",\n      \"method\": \"Co-immunoprecipitation, deletion mapping, reporter assay, subcellular localization imaging\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP domain mapping, functional reporter, and localization imaging; single lab\",\n      \"pmids\": [\"16820529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The highly conserved region (HCR) of Sin3A, spanning ~134 amino acids and sharing >80% identity with Sin3B, interacts with the N-terminus of the corepressor Alien; this interaction is demonstrated both in vivo by ChIP (at the CYP24 promoter) and in vitro; HCR overexpression inhibits Alien-mediated repression and induces endogenous CYP24 expression.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, reporter assay, GST pulldown\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, and functional reporter; two orthogonal approaches; single lab\",\n      \"pmids\": [\"15173382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The SIN3 interaction domain (SID) of Mad-family repressors and KLF proteins bind differentially to the PAH2 domain of Sin3A; computational and experimental analyses show two SID subtypes exhibit distinct PAH2 binding modes, providing structural insight into selective corepressor recruitment.\",\n      \"method\": \"Computational modeling, binding assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — computational plus limited experimental binding data; single lab, single study\",\n      \"pmids\": [\"12885416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The apo PAH2 domain of mSin3A is monomeric and folded at low micromolar concentrations but dimerizes at higher concentrations with concomitant partial unfolding, in contrast to mSin3B PAH2 behavior, suggesting paralog-specific structural differences relevant to coregulator interactions.\",\n      \"method\": \"NMR spectroscopy, analytical ultracentrifugation, biophysical analysis\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR and biophysical characterization; single lab, rigorous structural methods\",\n      \"pmids\": [\"16813833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sin3A interacts with c-Myc and causes deacetylation of c-Myc protein, directly repressing c-Myc activity; in the absence of Sin3A, c-Myc genomic recruitment to the epidermal differentiation complex is enhanced; simultaneous deletion of c-Myc and Sin3A reverts the aberrant skin phenotype, establishing a negative feedback loop.\",\n      \"method\": \"Conditional knockout mouse, ChIP, Co-immunoprecipitation, epistasis (double knockout rescue)\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (double KO rescue), ChIP, and Co-IP across multiple orthogonal methods\",\n      \"pmids\": [\"22101514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sin3a-null embryos suffer unresolved DNA damage and acute apoptosis specifically in the epiblast; Myc and E2F targets are downregulated in Sin3a-null ICMs; ES cells deleted for Sin3a show DNA double-strand break response, G2 arrest, and apoptosis, establishing Sin3a as essential for genomic integrity of pluripotent cells.\",\n      \"method\": \"Conditional knockout mouse, ES cell deletion, γH2AX staining, cell cycle analysis, gene expression profiling\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple in vivo and in vitro genetic deletion models with mechanistic cellular readouts\",\n      \"pmids\": [\"22206758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FOXN3 is physically associated with the SIN3A repressor complex in ER+ cells; the lncRNA NEAT1 is required for FOXN3 interactions with the SIN3A complex (shown by RNA immunoprecipitation); the FOXN3-NEAT1-SIN3A complex represses GATA3 and ER (ESR1) genes, forming a negative-feedback loop; NEAT1 is identified as a facultative component of the SIN3A complex.\",\n      \"method\": \"RNA immunoprecipitation-sequencing, ChIP-seq, Co-immunoprecipitation, in vitro/in vivo functional studies\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RIP-seq, ChIP-seq, and Co-IP with functional in vitro and in vivo validation; multiple orthogonal methods\",\n      \"pmids\": [\"28805661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LSD1 is an integral component of the SIN3A/HDAC complex; the LSD1/SIN3A/HDAC complex co-targets genes in p53 signaling and other pathways as shown by ChIP-on-chip; LSD1 and SIN3A coordinate to inhibit genes including CASP7, TGFB2, CDKN1A, HIF1A, TERT, and MDM2.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-on-chip, siRNA knockdown\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP-on-chip; single lab, two orthogonal methods\",\n      \"pmids\": [\"29741645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Sin3a interacts with Tet1 via a highly conserved SID in the PAH1 domain; two residues (Phe147, Phe182) in PAH1 are essential for Sin3a-Tet1 interaction; Sin3a-Tet1 complex activates transcription of Lefty1 and other target genes by promoting promoter DNA demethylation; this activity is required for ESC pluripotency.\",\n      \"method\": \"NMR spectroscopy, co-immunoprecipitation, ChIP-seq, MeDIP-seq, site-directed mutagenesis, reporter assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structural analysis, mutagenesis of interface residues, ChIP-seq, and DNA methylation sequencing in a single rigorous study\",\n      \"pmids\": [\"29733394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Tet1 contains a conserved SID that inserts into the PAH1 domain of Sin3A in a Type-II orientation similar to Sap25; mutagenesis of key SID residues abolishes the interaction and is absolutely required for Tet1 to repress transcription in cells.\",\n      \"method\": \"NMR spectroscopy, homology modelling, mutagenesis, Co-immunoprecipitation, transcription reporter assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR-based structural model combined with mutagenesis and functional transcription assay\",\n      \"pmids\": [\"30279502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CRL4B (CUL4B-containing ubiquitin ligase) physically interacts with the SIN3A-HDAC complex and co-occupies CDKN1A and CDKN1C promoters; CUL4B loss reduces SIN3A-HDAC retention on promoters, increases histone acetylation, and upregulates p21 and p57; the ubiquitylation function of CRL4B is not required for stable SIN3A-HDAC retention.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, histone acetylation assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP with functional readout; key mutagenesis control (ubiquitylation-dead mutant); single lab\",\n      \"pmids\": [\"25189618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sin3a is required for Sin3A/HDAC2 complex function in lung endoderm; loss of Sin3a in mouse early foregut endoderm causes embryonic lung epithelial progenitor cells to adopt a senescence-like state with permanent G1 arrest, mediated at least partially through upregulation of Cdkn1a and Cdkn2c; loss also disrupts epithelial-mesenchymal signaling.\",\n      \"method\": \"Conditional knockout mouse, cell cycle analysis, gene expression profiling\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined molecular mechanism (CDK inhibitor upregulation); single lab\",\n      \"pmids\": [\"28619823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Sertoli cell-specific deletion of Sin3a reduces undifferentiated spermatogonia (Plzf, Gfra1, Oct4 markers downregulated), disrupts CXCL12/SDF1 and CXCR4 signaling, causes progressive spermatogenic failure, and suppresses teratoma formation from fetal germ cells in transplantation assays, establishing a non-cell-autonomous epigenetic role for Sin3a in niche function.\",\n      \"method\": \"Conditional knockout mouse (Sertoli-specific), marker analysis, transplantation assay\",\n      \"journal\": \"Stem cells (Dayton, Ohio)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic conditional KO with defined phenotypic and molecular readouts; single lab\",\n      \"pmids\": [\"20572009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Sin3a-associated Hdac1 and Hdac2 control hematopoietic stem cell homeostasis cell-autonomously; bone-marrow-specific deletion of Sin3a phenocopies loss of Hdac1/2, causing bone marrow failure, establishing that Sin3a-associated HDAC1/2 activity is essential for HSC homeostasis.\",\n      \"method\": \"Conditional knockout mouse (bone marrow specific), HSPC analysis, phenotypic rescue\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via phenocopy of double Hdac1/2 KO by Sin3a KO; single lab\",\n      \"pmids\": [\"24763403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Gon4l interacts with YY1, Sin3a, and HDAC1 as components of a single complex in mouse B cells (demonstrated by sequential immunoprecipitation); a conserved central domain of Gon4l is required for this complex assembly; Gon4l represses promoter activity in a manner correlated with its ability to interact with Sin3a and HDAC1.\",\n      \"method\": \"Co-immunoprecipitation, sequential immunoprecipitation, density gradient sedimentation, reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — sequential Co-IP establishing single complex plus functional reporter; single lab\",\n      \"pmids\": [\"21454521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mohawk recruits components of the Sin3A/HDAC co-repressor complex (Sin3A, Hdac1, Sap18) and a subset of general transcription factors; MRD1 (one of three repressor domains in Mohawk) is co-immunoprecipitated by Sap18; Mohawk represses target genes required for myogenic differentiation through this mechanism.\",\n      \"method\": \"Co-immunoprecipitation, point mutation analysis, reporter assay\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP domain mapping with point mutation analysis and functional reporter; single lab\",\n      \"pmids\": [\"19235719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"T-bet-dependent removal of HDAC-Sin3A complexes from the Ifng locus drives H4 acetylation accumulation and Th1 differentiation; in Th0 cells, HDAC-Sin3A complexes actively prevent H4 acetylation; loss of HDAC-Sin3A occurs during Th1 lineage commitment through T-bet-dependent mechanisms.\",\n      \"method\": \"ChIP, T-bet genetic analysis, Th1/Th0 differentiation assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating T-bet-dependent removal; genetic pathway placement; single lab\",\n      \"pmids\": [\"19050254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Sumoylation of ING2 at lysine 195 by SUMO1 enhances its association with Sin3a; sumoylated ING2 is required for Sin3A/HDAC complex recruitment to target gene promoters (e.g., TMEM71) and for regulation of their transcription.\",\n      \"method\": \"In vitro sumoylation assay, Co-immunoprecipitation, ChIP, reporter assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo sumoylation assays with Co-IP and ChIP; single lab\",\n      \"pmids\": [\"20676127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PKCα/ERK signaling causes Sp1 phosphorylation, which leads to dissociation of the HDAC1/mSin3A repressor complex from Sp1 binding sites on the LHR promoter, histone H3 acetylation, and derepression of LHR transcription.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, kinase inhibition, dominant-negative overexpression\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and Co-IP with pharmacological and genetic manipulation; single lab, two orthogonal methods\",\n      \"pmids\": [\"18372343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"TGIF directly interacts with Sin3A, thereby recruiting HDAC1 to androgen receptor (AR)-responsive promoters to repress AR-mediated transcription; this repression is TSA-sensitive and TGIF binds the DNA-binding domain of AR.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay, TSA inhibition\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional reporter with pharmacological inhibition; single lab\",\n      \"pmids\": [\"11682623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"STAT3 is constitutively acetylated in NPM-ALK+ ALCL cells; acetylated STAT3 constitutively binds the Sin3A complex and together occupies promoters of silenced tumor suppressor genes; SIN3A silencing causes re-expression of TSGs and induces ALCL apoptosis in vitro and reduces tumorigenic potential in vivo. STAT3-Sin3A association was also found in breast adenocarcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, in vivo xenograft, resveratrol pharmacology\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP with in vivo validation; single lab, two cell model systems\",\n      \"pmids\": [\"30692217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ARID1A directly causes suppression of TERT expression and co-occupies the TERT promoter with the SIN3A repressor complex during retinoic acid-induced neuroblastoma differentiation; SIN3A co-occupancy is required for ARID1A-dependent TERT repression.\",\n      \"method\": \"ChIP-qPCR, TERT expression analysis, telomeric repeat amplification protocol, immunoblot\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-qPCR and functional assays; single lab\",\n      \"pmids\": [\"31365169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SIN3A is required for transcriptional induction of CYP1A1 by TCDD (aryl hydrocarbon receptor ligand); TCDD treatment increases SIN3A binding to both the proximal promoter and enhancer of Cyp1a1; ectopic human SIN3A rescues TCDD-induced EROD activity in Sin3A-depleted cells, establishing a positive (activating) role for SIN3A at an AhR target gene.\",\n      \"method\": \"siRNA knockdown, ectopic expression rescue, ChIP, EROD enzyme assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with rescue by ectopic SIN3A plus ChIP; single lab, two orthogonal methods\",\n      \"pmids\": [\"25305016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Fam60a defines a variant Sin3a-Hdac complex present in ES cells that additionally contains Ogt and Tet1; Fam60a is essential for maintaining the complex on chromatin at H3K4me3-positive promoters; depletion of Fam60a phenocopies loss of Sin3a (reduced proliferation, extended G1, deregulation of lineage genes).\",\n      \"method\": \"Tandem endogenous immunoprecipitation with quantitative mass spectrometry, ChIP-seq, siRNA knockdown, phenotypic analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — novel proteomic method for complex composition combined with ChIP-seq and genetic phenocopy; multiple orthogonal methods\",\n      \"pmids\": [\"28554894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The HDAC2/Sin3A/MeCP2 corepressor complex acts as an endogenous inhibitor of CTGF at the CTGF promoter; ET-1 disrupts this complex through MAP kinase-mediated HDAC2 phosphorylation, releasing HDAC2/Sin3A/MeCP2 from the CTGF promoter and allowing AP-1-driven CTGF expression.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, overexpression, kinase inhibitors\",\n      \"journal\": \"Journal of biomedical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP with pharmacological and genetic dissection; single lab\",\n      \"pmids\": [\"37312162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HDAC2 and cofactor Sin3A deacetylate histones H3K14ac and H3K27ac at the ASS1 promoter during arginine starvation, facilitating PHD2-driven HIF-1α proteasomal degradation at the promoter and enabling ASS1 derepression.\",\n      \"method\": \"ChIP, Co-immunoprecipitation, knockdown, proteasome inhibitor studies\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and Co-IP with pharmacological dissection; single lab, novel chromatin-linked proteolysis mechanism\",\n      \"pmids\": [\"28883660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Sin3A regulates hippocampal synaptic plasticity and long-term memory: postnatal neuronal deletion of Sin3a enhances hippocampal LTP and contextual fear memory; Sin3A loss increases Homer1 expression, alters mGluR1α and mGluR5 dependence of LTP, and increases ERK activation after learning.\",\n      \"method\": \"Conditional knockout mouse, electrophysiology (LTP), fear conditioning, ChIP, gene expression analysis\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional neuronal KO with electrophysiological and behavioral readouts plus molecular pathway identification (Homer1/mGluR); multiple orthogonal methods\",\n      \"pmids\": [\"32069266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SIN3A complex histone deacetylase activity protects stalled replication forks from MUS81 endonuclease-mediated cleavage; Sin3A is enriched at replicating DNA under hydroxyurea treatment; Sin3A-depleted cells show increased replication fork stalling, H3 acetylation at stalled forks, MRE11-dependent DNA degradation, and impaired fork recovery—effects partially dependent on MUS81.\",\n      \"method\": \"iPOND (isolation of proteins on nascent DNA), ChIP, DNA fiber assays, siRNA knockdown, genetic epistasis (MUS81 co-depletion)\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (iPOND, ChIP, DNA fiber) with genetic epistasis establishing MUS81-dependent mechanism; rigorous study\",\n      \"pmids\": [\"38341854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Nuclear complement C3b physically associates with the HDAC1/2-containing SIN3A complex; this interaction enhances SIN3A complex binding to the GADD45A promoter, reducing H3 acetylation and repressing GADD45A expression, thereby promoting paclitaxel resistance in NSCLC.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, nuclear fractionation, siRNA knockdown, ectopic expression\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP with functional knockdown/overexpression studies; single lab\",\n      \"pmids\": [\"37291119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sin3a regulates the developmental progression through the morula-to-blastocyst transition via Hdac1: Sin3a depletion increases Trp53 acetylation (K379), reduces Cdx2 and Nanog, causes global DNA hypermethylation via increased nuclear DNMT1, and downregulates Hdac1; exogenous Hdac1 but not Hdac2 rescues the block.\",\n      \"method\": \"siRNA knockdown in mouse embryos, RNA-seq, Western blot, immunofluorescence, rescue by Hdac1 mRNA injection\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific Hdac1 rescue distinguishes paralog requirement; RNA-seq and molecular assays; single lab\",\n      \"pmids\": [\"31450981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Tet2 recruits Sin3a to active enhancers in ESCs; Tet2 deficiency diminishes Sin3a at active enhancers and promoters; combined Tet1/2 loss (but not loss of their catalytic activities alone) reduces Sin3a at active enhancers, showing that Tet1/2 noncatalytic functions recruit Sin3a.\",\n      \"method\": \"ChIP-seq, Tet2 catalytic mutant and KO ESCs, Co-immunoprecipitation\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq and catalytic-dead mutant genetic dissection; single lab, two orthogonal methods\",\n      \"pmids\": [\"37456851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SINHCAF/FAM60A links the SIN3A-HDAC complex to the hypoxia response by specifically repressing HIF-2α mRNA and protein expression; SINHCAF interacts with SP1 and recruits HDAC1 to the HIF-2α promoter to mediate this repression.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, angiogenesis assays\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP with functional knockdown; single lab, two orthogonal methods\",\n      \"pmids\": [\"29784889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Disruption of the SIN3A PAH2 domain interaction with PF1 (PHF12/SID-containing adaptor) using a competitive Tat-SID peptide blocks EMT and stem cell marker expression in TNBC; KLF9 is recruited to ITGA6 and ITGB1 promoters by SIN3A and mediates their repression; KLF9 knockdown re-establishes invasion.\",\n      \"method\": \"Peptide competition (Tat-SID), Co-immunoprecipitation, ChIP, siRNA knockdown, in vitro and in vivo invasion assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP with functional peptide competition and genetic rescue; single lab\",\n      \"pmids\": [\"26460951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BIM is epigenetically silenced in NPM/ALK+ ALCL through recruitment of MeCP2 and the SIN3a/HDAC1/2 corepressor complex to the BIM locus; CpG methylation is required for MeCP2 corepressor complex recruitment; demethylation with 5-azacytidine detaches the complex and reacetylates histone tails.\",\n      \"method\": \"ChIP, DNA methylation analysis (5-azacytidine treatment), histone acetylation assays, siRNA knockdown\",\n      \"journal\": \"Neoplasia (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with pharmacological and genetic manipulation; single lab\",\n      \"pmids\": [\"23633923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sin3A couples with MeCP2 at the GFAP promoter to suppress GFAP transcription; upon astrocyte differentiation, Sin3A-MeCP2 depart from the promoter coincident with STAT3 binding, CBP/p300 recruitment, and histone H3K9/K14 acetylation that drives GFAP expression.\",\n      \"method\": \"ChIP, immunofluorescence, siRNA knockdown, reporter assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and co-occupancy data with functional knockdown; single lab\",\n      \"pmids\": [\"21779366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Sin3A functions as a transcriptional coactivator cooperating with Tet1 to facilitate hydroxymethylation of epithelial gene promoters; disrupting the Sin3a-Tet1 interaction (via PAH1 mutants) significantly blocks mesenchymal-to-epithelial transition and iPSC generation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, hydroxymethylated DNA immunoprecipitation (hMeDIP), site-directed mutagenesis, RNA-seq\",\n      \"journal\": \"Stem cell research & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and epigenomic sequencing with mutagenesis; single lab, corroborates prior Zhu et al. 2018 study\",\n      \"pmids\": [\"35073971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SIN3A loss in pancreatic β-cells compromises survival, insulin-vesicle packaging, insulin secretion, and nutrient-induced Ca2+ influx; ChIP assays identify direct Sin3a target genes in β-cells modulating Ca2+/ion transport, cell survival, vesicle trafficking, and glucose metabolism.\",\n      \"method\": \"Conditional knockout mouse (endocrine progenitor), RNA-seq, ChIP, calcium imaging, insulin secretion assays\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with multiple physiological and molecular readouts; ChIP confirms direct targets; rigorous multi-method study\",\n      \"pmids\": [\"32245798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SIN3A depletion in porcine early embryos reduces CCNB1 (Cyclin B1) transcript levels and causes two-cell stage arrest; injection of CCNB1 mRNA partially rescues SIN3A-depleted embryos, establishing SIN3A regulation of CCNB1 as a key mechanism in porcine embryonic development.\",\n      \"method\": \"siRNA knockdown, RNA-seq, mRNA rescue injection, immunofluorescence\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-seq identification combined with specific mRNA rescue; single lab\",\n      \"pmids\": [\"33692994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Sin3A-deficient CD4+ T cells fail to properly upregulate Il17a, Il23r, and Il22 under Th17 skewing conditions; instead, IL-2+ and FOXP3+ cells accumulate; Sin3A deletion causes overt STAT3 activation, aberrant cytoplasmic RORγt accumulation, and enrichment of mTORC1 signaling genes.\",\n      \"method\": \"Conditional knockout mouse (CD4-Cre), flow cytometry, cytokine assays, gene expression analysis\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined molecular pathway placement (STAT3, RORγt, mTORC1); single lab\",\n      \"pmids\": [\"36929576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Mouse Sin3A physically associates with the strong repressive isoform of Mxi1 (Mxi1-SR); a mSin3A-Mxi1 fusion protein in which the mSin3-interacting domain of Mxi1 is replaced by full-length mSin3A exhibits repression equivalent to Mxi1-SR, demonstrating that the Mxi1 N-terminal repression domain functions solely to recruit mSin3A.\",\n      \"method\": \"Co-immunoprecipitation, fusion protein repression assay, transformation assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional fusion protein rescue demonstrating sufficiency; single lab\",\n      \"pmids\": [\"8649810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Chick Dach1 interacts with the Smad complex and the corepressor Sin3a, acting as a repressor of BMP-mediated transcriptional control; this interaction regulates apical ectodermal ridge formation and proximodistal patterning in the limb.\",\n      \"method\": \"Co-immunoprecipitation, in vivo limb functional assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and in vivo developmental phenotype; single lab\",\n      \"pmids\": [\"15280207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Sin3a is required in the male germline for mitotic reentry of gonocytes; germline genetic inactivation of Sin3a causes rapid depletion of gonocytes coincident with cell cycle reentry, 2.5-fold increased histone H3 phosphorylation, prophase/metaphase block, near-complete germ cell loss, and altered Sertoli cell expression programs.\",\n      \"method\": \"Conditional knockout mouse (germline), histone phosphorylation analysis, gene expression profiling\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined cell cycle and molecular readouts; single lab\",\n      \"pmids\": [\"22820070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZBTB25 and Sin3A associate with the HDAC1 silencing complex and are recruited to the IL-12B promoter in M. tuberculosis-infected macrophages to downregulate IL-12B expression; ZBTB25 knockdown prevents complex recruitment and enhances IL-12p40 release.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, cytokine assays\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP with functional siRNA knockdown; single lab\",\n      \"pmids\": [\"33627504\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SIN3A is an evolutionarily conserved scaffold protein that nucleates a large histone deacetylase (HDAC1/2)-containing co-repressor complex; it uses four paired amphipathic helix (PAH) domains—structurally defined by NMR—as docking platforms for diverse transcription factors and co-regulators (Mad/Mxi, MBD2b, SAP30/SAP30L via PAH3, PSF, REST, Snail, Ebp1, TGIF, Alien/HCR, and Tet1 via PAH1), recruiting HDAC activity to specific gene promoters to deacetylate histones and repress transcription; SIN3A is itself regulated by post-translational events on its partners (e.g., PRMT1 methylation of RUNX1 abrogates SIN3A binding, PKCα/ERK-mediated Sp1 phosphorylation releases the complex from promoters, SUMO1 modification of ING2 enhances SIN3A association); paradoxically, SIN3A also acts as a transcriptional co-activator in select contexts by interacting with Tet1/Tet2 to promote DNA demethylation at target gene promoters and by facilitating AhR-induced CYP1A1 transcription; beyond transcription, the SIN3A-HDAC complex protects stalled DNA replication forks from MUS81 endonuclease cleavage by maintaining chromatin deacetylation; SIN3A suppresses co-transcriptional R-loops through physical interaction with the THO/TREX complex; and haploinsufficiency of SIN3A in humans causes Witteveen-Kolk syndrome, characterized by intellectual disability, microcephaly, and cortical developmental abnormalities, reflecting its essential role—demonstrated in multiple conditional knockout mouse models—in hematopoiesis, spermatogenesis, β-cell function, lung endoderm specification, and neuronal plasticity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SIN3A is an evolutionarily conserved scaffold that nucleates a histone deacetylase (HDAC1/2) co-repressor complex and is recruited to specific promoters by a wide array of sequence-specific transcription factors and adaptors, where it enforces histone deacetylation and transcriptional silencing [#1, #20, #29]. Recruitment occurs through SIN3A's paired amphipathic helix (PAH) domains, which serve as modular docking platforms: PAH2 binds the SIN3-interaction domains of Mad/Mxi1-family and KLF repressors and the PF1/PHF12 adaptor [#19, #48, #55], PAH3/HID binds MBD2b and the constitutively associated SAP30/SAP30L subunits—the latter targeting the complex to the nucleolus—with the PAH3–SAP30 interface defined at atomic resolution by NMR [#6, #15, #16], and PAH1 docks Tet1 via a conserved SID whose interface residues are required for function [#24, #25]. Through these contacts SIN3A is delivered to chromatin by repressors and adaptors including Snail, REST, PSF, Ebp1, TGIF, Alien/HCR, BMP-Smad effectors, Gon4l, Mohawk, and MeCP2, and its targeting and release are controlled by post-translational events on its partners, such as PRMT1 methylation of RUNX1 that abolishes SIN3A binding and PKCα/ERK-driven Sp1 phosphorylation that evicts the complex from promoters [#0, #1, #3, #2, #34]. SIN3A also deacetylates non-histone substrates including c-Myc and STAT3, forming negative-feedback circuits that restrain their activity [#20, #10]. Paradoxically, SIN3A functions as a co-activator when partnered with Tet1/Tet2, promoting promoter DNA demethylation/hydroxymethylation to activate target genes and to support ESC pluripotency and reprogramming [#24, #46, #51]. Beyond transcription, the SIN3A–HDAC complex maintains genome integrity: it suppresses co-transcriptional R-loops through physical interaction with the THO/TREX complex and protects stalled replication forks from MUS81-mediated cleavage by keeping nascent chromatin deacetylated [#4, #43]. SIN3A is essential in vivo for pluripotent-cell genomic integrity, hematopoietic stem cell homeostasis, spermatogenesis, lung endoderm specification, β-cell function, and neuronal plasticity and memory [#21, #29, #57, #27, #52, #42].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established that a transcriptional repressor's silencing activity can be reduced to its capacity to recruit SIN3A, defining SIN3A as the functional repression module downstream of Mad/Mxi1 factors.\",\n      \"evidence\": \"Co-IP and fusion-protein repression/transformation assays with Mxi1 in mouse cells\",\n      \"pmids\": [\"8649810\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not resolve how SIN3A connects to deacetylase enzymatic activity\", \"Single repressor system\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Showed SIN3A links DNA-bound repressors to HDAC activity at native gene promoters, providing the first promoter-level mechanism for RE1/NRSE silencing of neuronal genes.\",\n      \"evidence\": \"Co-IP, reporter and promoter occupancy assays with REST on GluR2 and sodium channel genes\",\n      \"pmids\": [\"10491605\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain of SIN3A engaged by REST not mapped\", \"HDAC catalytic dependence inferred pharmacologically\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identified the PAH domains as discrete partner-docking surfaces, mapping methyl-CpG reader MBD2b to PAH3.\",\n      \"evidence\": \"GST pulldown, Co-IP, deletion mapping\",\n      \"pmids\": [\"10950960\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural detail of the interface\", \"Single adaptor\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined PAH2 as a selectively recognized interface with distinct SID binding modes, explaining how different repressor classes are differentially recruited.\",\n      \"evidence\": \"Computational modeling plus binding assays of Mad-family and KLF SIDs\",\n      \"pmids\": [\"12885416\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Primarily computational with limited experimental binding data\", \"No high-resolution complex structure\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Extended SIN3A recruitment to developmental and EMT contexts, showing Snail and BMP-Smad/Dach1 effectors deliver the HDAC–SIN3A complex to target promoters.\",\n      \"evidence\": \"Co-IP, ChIP, TSA inhibition (Snail/E-cadherin) and in vivo limb assays (Dach1/Smad)\",\n      \"pmids\": [\"14673164\", \"15280207\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Promoter-specificity determinants not defined\", \"Interface mapping on SIN3A absent\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapped the SAP30/SAP30L constitutive subunits to the PAH3/HID region and showed they direct SIN3A to the nucleolus, linking the complex to rRNA-gene loci.\",\n      \"evidence\": \"Co-IP, deletion mapping, NLS analysis, localization imaging and biophysical NMR/AUC of PAH2\",\n      \"pmids\": [\"16820529\", \"16813833\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequences at rDNA not directly demonstrated\", \"Paralog-specific PAH2 behavior of unclear in vivo relevance\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated that post-translational modification of SIN3A partners acts as a switch controlling complex assembly and promoter occupancy.\",\n      \"evidence\": \"Mass spectrometry, methyl-arginine antibodies, Co-IP/ChIP (PRMT1–RUNX1) and ChIP/Co-IP with kinase inhibition (Sp1)\",\n      \"pmids\": [\"18316480\", \"18372343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SIN3A itself is modified not addressed\", \"Generalizability across other partners untested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed atomic-resolution recognition (PAH3–SAP30 SID) and established SIN3A as a deacetylase of non-histone substrates with tumor-suppressive feedback roles.\",\n      \"evidence\": \"NMR solution structure with nucleic-acid binding; conditional KO, ChIP, Co-IP and double-KO epistasis (c-Myc)\",\n      \"pmids\": [\"21676866\", \"22101514\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How non-histone deacetylation is targeted in vivo unclear\", \"Structures of other PAH–SID complexes lacking\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established SIN3A as essential for genomic integrity of pluripotent cells, connecting transcriptional control to DNA damage avoidance.\",\n      \"evidence\": \"Conditional KO mouse and ES-cell deletion with γH2AX, cell-cycle and expression profiling\",\n      \"pmids\": [\"22206758\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between SIN3A loss and DSB formation not resolved\", \"Distinguishing transcriptional vs. replicative cause\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined SIN3A as a context-dependent signaling switch that deacetylates STAT3 and gates interferon/STAT transcriptional output.\",\n      \"evidence\": \"Genome-wide RNAi screen, Co-IP, ChIP, siRNA\",\n      \"pmids\": [\"22783022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of substrate selection (STAT3 vs ISGF3 components) unclear\", \"Direct vs indirect deacetylation\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected the SIN3A–HDAC complex to genome stability via the THO/TREX complex, showing it suppresses co-transcriptional R-loops by maintaining deacetylation.\",\n      \"evidence\": \"Reciprocal Co-IP, siRNA, DRIP, immunofluorescence, replication fork assays\",\n      \"pmids\": [\"29074626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How deacetylation mechanistically prevents R-loops not resolved\", \"Direct THO subunit contact on SIN3A not mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified compositionally distinct, lineage-specialized SIN3A complexes (FAM60A/SINHCAF-containing) that incorporate OGT/Tet1 and target H3K4me3 promoters and the hypoxia response.\",\n      \"evidence\": \"Tandem endogenous IP with quantitative MS, ChIP-seq, siRNA phenocopy; Co-IP/ChIP for HIF-2α\",\n      \"pmids\": [\"28554894\", \"29784889\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full catalog of variant complexes incomplete\", \"How FAM60A retains the complex on chromatin mechanistically unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved the PAH1–Tet1 SID interface and established a co-activator mode of SIN3A in which Tet1/2 partnership promotes DNA demethylation to activate genes and sustain pluripotency.\",\n      \"evidence\": \"NMR, mutagenesis of interface residues, Co-IP, ChIP-seq, MeDIP-seq, reporter assays\",\n      \"pmids\": [\"29733394\", \"30279502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single scaffold toggles between repressive and activating output unclear\", \"Catalytic-independent Tet recruitment mechanism only partly defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated tissue-level physiological requirements for SIN3A in β-cell function and in hippocampal synaptic plasticity and memory, linking the scaffold to specific direct target programs.\",\n      \"evidence\": \"Conditional KO mice with RNA-seq, ChIP, calcium imaging/insulin secretion (β-cell); electrophysiology, behavior, ChIP (neuronal)\",\n      \"pmids\": [\"32245798\", \"32069266\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which partner factors recruit SIN3A to these tissue-specific targets unknown\", \"Causal HDAC-substrate links per phenotype not fully dissected\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established a direct replication-fork-protective role for SIN3A-complex deacetylase activity, shielding stalled forks from MUS81 cleavage by keeping nascent chromatin deacetylated.\",\n      \"evidence\": \"iPOND, ChIP, DNA fiber assays, siRNA, MUS81 co-depletion epistasis\",\n      \"pmids\": [\"38341854\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SIN3A is recruited specifically to stalled forks unclear\", \"Relationship to its transcriptional role at the same loci undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved what molecular logic determines whether SIN3A acts as a repressor versus a Tet-dependent co-activator at a given locus, and how the scaffold integrates its transcriptional, R-loop-suppressing, and fork-protective activities.\",\n      \"evidence\": \"No single study in the corpus reconciles the repressive and activating modes mechanistically\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model for repressor-to-coactivator switching\", \"Determinants of variant-complex assembly across cell types incomplete\", \"Structural basis of full PAH-domain partner selectivity not comprehensively defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 20, 22, 55]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [15, 16, 24, 48]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [20, 10]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 20, 22]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [16, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 20, 29]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 1, 32]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [4, 43, 21]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [21, 27, 24, 51]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 36, 5]}\n    ],\n    \"complexes\": [\n      \"SIN3A-HDAC1/2 co-repressor complex\",\n      \"FAM60A/SINHCAF variant Sin3A-HDAC complex (with OGT, Tet1)\",\n      \"THO/TREX complex (physical partner)\"\n    ],\n    \"partners\": [\n      \"HDAC1\",\n      \"HDAC2\",\n      \"SAP30\",\n      \"Tet1\",\n      \"MeCP2\",\n      \"STAT3\",\n      \"FAM60A\",\n      \"LSD1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}