{"gene":"SOX4","run_date":"2026-06-10T07:46:38","timeline":{"discoveries":[{"year":2007,"finding":"SOX4 enhances beta-catenin/TCF activity and proliferation of SW480 colon carcinoma cells; SOX4 physically interacts with TCF/LEF family members via its HMG box domain and may function to stabilize beta-catenin protein, in contrast to SOX17 which promotes proteasome-dependent degradation of beta-catenin and TCF.","method":"Gain- and loss-of-function assays, co-immunoprecipitation, luciferase reporter assay, proteasome inhibitor experiments in SW480 cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, gain/loss-of-function, multiple orthogonal methods in single lab","pmids":["17875931"],"is_preprint":false},{"year":2008,"finding":"SOX4 (and SOX11, SOX12) share a conserved C-terminal transactivation domain (TAD) consisting of the last 33 residues; this TAD is required for transcriptional activation, and acidic domains interfere with DNA binding. SOX4's TAD activates transcription less efficiently than SOX11 due to less stable alpha-helical structure.","method":"Deletion mutagenesis, reporter gene transactivation assays, structural analysis of TAD","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis plus functional reporter assays with structural validation in single lab, multiple orthogonal methods","pmids":["18403418"],"is_preprint":false},{"year":2009,"finding":"SOX4 is induced by DNA damage, interacts with p53 protein, blocks Mdm2-mediated p53 ubiquitination and degradation thereby stabilizing p53, and enhances p53 acetylation by facilitating formation of a p300/CBP/p53 complex. These activities promote cell cycle arrest and apoptosis in a p53-dependent manner.","method":"Co-immunoprecipitation, ubiquitination assays, apoptosis/cell cycle assays, gain/loss-of-function in cell lines and in vivo tumorigenesis models","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, multiple orthogonal functional assays in single lab","pmids":["19234109"],"is_preprint":false},{"year":2010,"finding":"SOX4 stabilizes beta-catenin protein (without inducing its transcription) by inducing CK2 expression, thereby enhancing beta-catenin/TCF activity and cyclin D1 levels in a dose-dependent manner.","method":"SOX4 overexpression and siRNA knockdown, western blot, luciferase reporter assay","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, western blot plus reporter assay, two orthogonal methods","pmids":["21165564"],"is_preprint":false},{"year":2012,"finding":"SOX4 overexpression in immortalized mammary epithelial cells is sufficient to induce EMT and activate the TGF-β pathway; SOX4 is required for TGF-β-induced EMT, and cooperates with oncogenic Ras to promote tumorigenesis in vivo.","method":"Ectopic overexpression, shRNA knockdown, xenograft mouse models, TGF-β pathway assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with in vivo validation, multiple orthogonal methods in single lab","pmids":["22787120"],"is_preprint":false},{"year":2012,"finding":"SOX4 positively regulates Dicer expression by binding to the Dicer promoter and enhancing its transcriptional activity, thereby suppressing melanoma cell invasion through regulation of miRNA biogenesis.","method":"Promoter binding assay (gel mobility shift), luciferase reporter assay, shRNA knockdown, Matrigel invasion assay, tissue microarray","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gel shift plus reporter plus functional invasion assay, single lab, multiple methods","pmids":["22689055"],"is_preprint":false},{"year":2013,"finding":"SOX4 mediates TGF-β-induced expression of mesenchymal markers (N-cadherin, vimentin, fibronectin) in human mammary epithelial cells; conditional activation of SOX4 is sufficient to induce these markers but not complete EMT (no change in E-cadherin or beta-catenin); shRNA-mediated knockdown of SOX4 significantly delays TGF-β-induced mesenchymal gene expression.","method":"Conditional SOX4 activation system, shRNA knockdown, qRT-PCR, western blot","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — inducible system plus knockdown, multiple markers assessed, single lab","pmids":["23301048"],"is_preprint":false},{"year":2013,"finding":"SOX4 is required for the survival of pro-B cells; SOX4-deficient pro-B cells undergo apoptosis, show decreased activation of Src downstream of c-Kit, and have reduced Bcl2 levels. Restoration of Bcl2 partially rescues pro-B cell survival and B cell maturation in the absence of Sox4.","method":"Conditional Sox4 knockout mice, flow cytometry, apoptosis assays, Bcl2 transgene rescue experiment","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO mouse model with genetic rescue, multiple orthogonal readouts","pmids":["23345330"],"is_preprint":false},{"year":2013,"finding":"SOX4 promotes skeletal myoblast differentiation by transcriptionally activating caldesmon (Cald1) expression; Sox4 binds to the Cald1 promoter; knockdown of Sox4 reduces caldesmon synthesis and myoblast fusion, while overexpression of caldesmon in Sox4-silenced cells rescues differentiation.","method":"Promoter analysis, gel mobility shift assay, siRNA knockdown, overexpression, C2C12 differentiation assays, mouse embryonic muscle experiments","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct promoter binding plus functional rescue in both cell line and in vivo model, single lab","pmids":["24046453"],"is_preprint":false},{"year":2014,"finding":"ERG transcriptionally regulates SOX4 expression via binding to its promoter; ERG and SOX4 physically interact and cooperate in TGF-β1-induced EMT in prostate cancer cells. TGF-β1 increases active chromatin marks (H3K4me3, H4K16ac) and decreases H3K27me3 at ERG and SOX4 promoters.","method":"Co-immunoprecipitation, ChIP assay, siRNA knockdown, EMT functional assays","journal":"The Prostate","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP plus functional assays, single lab","pmids":["24435928"],"is_preprint":false},{"year":2015,"finding":"SOX4 promotes esophageal cancer cell invasion by forming a co-repressor complex with EZH2 and HDAC3 that binds the miR-31 promoter, silencing miR-31 through H3K27me3 and histone deacetylation; miR-31 in turn targets SOX4 mRNA for degradation, creating a feedback loop.","method":"Co-immunoprecipitation, ChIP assay, methylation studies, overexpression and shRNA knockdown, migration/invasion assays","journal":"Molecular cancer","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP of complex plus ChIP at miR-31 promoter, multiple orthogonal methods, single lab","pmids":["25644061"],"is_preprint":false},{"year":2016,"finding":"SOX4 directly transcriptionally activates TMEM2; TMEM2 mediates SOX4-dependent pro-invasive and pro-migratory effects and metastatic colonization in breast cancer cells.","method":"Systematic genomic/molecular approach, ChIP-seq, functional invasion/migration assays, gain/loss-of-function","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus functional validation, single lab","pmids":["27328729"],"is_preprint":false},{"year":2016,"finding":"Increased SOX4 expression reduces insulin secretion by increasing kiss-and-run exocytosis (fusion pore restricted to ~2 nm diameter, preventing insulin exit) through upregulation of STXBP6; silencing STXBP6 reverses the SOX4-mediated inhibition of hormone release.","method":"Mutant Sox4 mouse model, single-granule exocytosis measurements, microarray, SOX4 overexpression in EndoC-βH2 cells, STXBP6 siRNA rescue, human islet preparations (n=63)","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo mouse model plus single-granule exocytosis measurements plus human islet validation plus genetic rescue, multiple orthogonal methods","pmids":["26993066"],"is_preprint":false},{"year":2017,"finding":"SOX4 allows facultative beta-cell proliferation through direct repression of Cdkn1a (p21); Sox4 conditional knockout mice develop progressive diabetes due to reduced beta-cell proliferation caused by Cdkn1a induction.","method":"Inducible beta-cell-specific Sox4 knockout mouse model, immunostaining for beta-cell mass, gene expression analysis, Cdkn1a regulation studies","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible conditional KO in vivo with gene expression mechanistic follow-up, replicates prior diabetes association finding","pmids":["28495880"],"is_preprint":false},{"year":2017,"finding":"SOX4 transcriptionally upregulates the miR-17-92 cluster in prostate cancer cells, which in turn downregulates RB1 protein expression, promoting cell proliferation, migration, invasion, and neuroendocrine phenotype.","method":"High-throughput miRNA profiling, ChIP/luciferase assays for SOX4 binding to miR-17-92 locus, functional knockdown studies","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional assays, single lab","pmids":["31238254"],"is_preprint":false},{"year":2017,"finding":"SOX4 directly binds ADAMTS4 and Adamts5 gene promoters and up-regulates their expression in chondrogenic cells; overexpression of Sox4 via adenovirus in mouse femoral head cartilage organ cultures causes articular cartilage destruction with increased Adamts5 expression.","method":"Luciferase reporter assay, ChIP assay, adenovirus-mediated overexpression, organ culture experiments","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct promoter binding confirmed by ChIP plus reporter, with in vitro and ex vivo functional validation, single lab","pmids":["30016600"],"is_preprint":false},{"year":2017,"finding":"SOX4 represses Sox9 transcription via the upstream testis-specific enhancer core (TESCO) element in fetal gonads, acting as a transcriptional repressor in a context-dependent manner. Sox4 deficiency results in elongated gonads, increased testis cords, and impaired male germ cell differentiation markers (reduced Nanos2 and Dnmt3l).","method":"Sox4 conditional knockout mice, reporter assays with TESCO element, gene expression profiling","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse model plus reporter assay, single lab","pmids":["28118982"],"is_preprint":false},{"year":2018,"finding":"SOX4 controls iNKT cell differentiation in the thymus by inducing MicroRNA-181 (Mir181) expression to enhance TCR signaling and Ca2+ fluxes in iNKT precursors.","method":"Genetic analysis, miRNA profiling, Ca2+ flux assays, gain/loss-of-function in developing thymocytes","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays with defined molecular mechanism, single lab","pmids":["30287480"],"is_preprint":false},{"year":2018,"finding":"Sox4 promotes tuft and enteroendocrine cell lineage allocation in the intestine independently of Atoh1; Sox4 conditional knockout mice show impaired ISC function and reduced tuft/enteroendocrine cell numbers; overexpression of Sox4 is sufficient to induce tuft and enteroendocrine differentiation even in the absence of Atoh1.","method":"Sox4 conditional intestinal-specific knockout mice, organoids, single-cell RNA-seq, IL-13 stimulation, helminth infection model, Atoh1 inducible KO organoids with SOX4 overexpression","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO mouse model, inducible overexpression, genetic epistasis with Atoh1, in vivo infection model, multiple orthogonal approaches","pmids":["30055169"],"is_preprint":false},{"year":2019,"finding":"SOX11 and SOX4 drive reactivation of an embryonic gene program during wound repair; SOX4 directly targets FSCN1 (fascin) to regulate cell migration; deficiency of Sox11 and Sox4 accelerates differentiation and dramatically impairs cell motility and re-epithelialization.","method":"Mouse wound model, Sox4/Sox11 deficiency studies, ChIP, gene expression analysis, cell motility assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo wound model with direct target identification by ChIP, multiple orthogonal methods","pmids":["31492871"],"is_preprint":false},{"year":2019,"finding":"MTA1 acts upstream of SOX4 in TGF-β-mediated EMT; a TGF-β-MTA1-SOX4-EZH2 signaling cascade drives EMT, where SOX4 is required for both MTA1-driven and TGF-β-driven EMT, and EZH2 is a critical downstream responsive gene of this axis.","method":"Gene expression profiling, shRNA knockdown, overexpression in multiple cancer cell lines, TCGA/cDNA microarray validation","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis established by knockdown in multiple cell lines, single lab, validated in patient data","pmids":["31811272"],"is_preprint":false},{"year":2019,"finding":"C-MYC transcriptionally activates SOX4 by binding to its promoter; C-MYC and SOX4 proteins physically interact in prostate cancer cells.","method":"ChIP assay, luciferase reporter assay, Co-immunoprecipitation","journal":"Medical oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus Co-IP plus reporter assay, single lab","pmids":["31560094"],"is_preprint":false},{"year":2019,"finding":"De novo heterozygous missense variants in the HMG DNA-binding domain of SOX4 cause a neurodevelopmental syndrome; these variant proteins are unable to bind DNA in vitro and fail to transactivate SOX reporter genes in cultured cells, establishing loss of DNA-binding activity as the pathogenic mechanism.","method":"Trio-based exome sequencing, in vitro DNA binding assays, luciferase reporter transactivation assays, Xenopus sox4 knockdown","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro DNA binding plus transactivation assays plus in vivo Xenopus model, multiple orthogonal methods in single study","pmids":["30661772"],"is_preprint":false},{"year":2020,"finding":"METTL14-mediated m6A modification of SOX4 mRNA promotes its degradation via the YTHDF2-dependent pathway; knockdown of METTL14 abolishes SOX4 mRNA m6A modification and elevates SOX4 mRNA expression.","method":"MeRIP-Seq, RNA immunoprecipitation, METTL14 knockdown/overexpression, YTHDF2 pathway assays","journal":"Molecular cancer","confidence":"High","confidence_rationale":"Tier 1 / Moderate — MeRIP-Seq plus RIP assay plus functional validation, multiple orthogonal methods in single lab","pmids":["32552762"],"is_preprint":false},{"year":2020,"finding":"SOX4 expression is regulated by the integrin αvβ6 receptor on TNBC cells, which activates TGF-β from a latent precursor; this integrin αvβ6-TGF-β-SOX4 pathway drives immune evasion. Inactivation of SOX4 increases expression of innate and adaptive immune pathway genes; an integrin αvβ6/8-blocking monoclonal antibody inhibits SOX4 expression.","method":"SOX4 inactivation in tumor cells, gene expression profiling, integrin blocking antibody, murine TNBC models","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — pathway epistasis established with mechanistic studies plus in vivo model, multiple orthogonal methods","pmids":["33385331"],"is_preprint":false},{"year":2020,"finding":"SOX4 directly controls expression of a subset of tRNA genes (including tRNAi) via RNA polymerase III; SOX4 binds specific tRNA gene loci (identified by ChIP-seq) and impedes recruitment of TATA box binding protein and Pol III, thereby repressing tRNA expression and inhibiting cell proliferation in glioblastoma cells.","method":"ChIP-seq (genome-wide SOX4 binding), CRISPR/Cas9 tRNAi knockdown, ectopic tRNAi rescue, glioblastoma proliferation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP-seq plus CRISPR KD plus rescue experiment, multiple orthogonal methods in single lab","pmids":["32123087"],"is_preprint":false},{"year":2020,"finding":"TGF-β mediates upregulation of CD39 expression on regulatory T cells via SOX4 as a downstream transcription factor; overexpression of SOX4 in Treg strongly increases CD39 expression, and CRISPR/Cas9-mediated knockout of SOX4 in Treg decreases CD39 expression.","method":"SOX4 overexpression, CRISPR/Cas9 knockout in Treg, flow cytometry, TGF-β/mTOR pathway assays","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO plus overexpression with defined phenotypic readout, single lab","pmids":["32319705"],"is_preprint":false},{"year":2021,"finding":"SOX4 and SMARCA4 form a complex required to maintain open chromatin at TGFBR2 regulatory regions; this SOX4-SMARCA4 complex directly transcriptionally activates TGFBR2, which is required for SOX4-dependent PI3K/Akt signaling in triple-negative breast cancer.","method":"Co-immunoprecipitation, ChIP assay, ATAC-seq/chromatin accessibility assay, TGFBR2 knockdown rescue, genomic/proteomic analyses","journal":"NPJ breast cancer","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP plus chromatin accessibility assay plus functional rescue, multiple orthogonal methods in single lab","pmids":["33837205"],"is_preprint":false},{"year":2021,"finding":"CRISPR/Cas9-mediated loss of SOX4 in mammary tumor organoids inhibits differentiation by regulating a subset of fetal mammary stem cell (fMaSC) genes; SOX4 is required for maintaining tumor cells in an undifferentiated and proliferative state, and its loss impairs primary tumor growth and metastatic outgrowth.","method":"CRISPR/Cas9 knockout in PyMT mouse mammary organoids, RNA-seq, in vivo tumor growth assays, competitive growth experiments","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRISPR KO plus RNA-seq plus in vivo validation, multiple orthogonal methods in single lab","pmids":["34584219"],"is_preprint":false},{"year":2022,"finding":"SOX4 directly regulates FOXO1 expression (established by genome-wide SOX4 chromatin binding assay and RNA-seq) and modulates progesterone receptor (PGR) stability by repressing E3 ubiquitin ligase HERC4-mediated degradation, as identified by immunoprecipitation and mass spectrometry; this SOX4-HERC4-PGR axis is required for human endometrial stromal cell decidualization.","method":"Genome-wide ChIP-seq (SOX4 binding), RNA-seq, immunoprecipitation, mass spectrometry, functional decidualization assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP-seq plus IP-MS for complex identification plus functional decidualization assays, multiple orthogonal methods","pmids":["35244538"],"is_preprint":false},{"year":2022,"finding":"SOX4 and RELA/p65 physically interact on chromatin; ChIP-seq reveals 70.4% of SOX4 peak summits are within 50 bp of RELA peak summits; together they co-operatively regulate TNF-responsive genes including inflammation mediators, histone remodeling enzymes and AP-1 pathway components in fibroblast-like synoviocytes. An autoregulatory mode involves TNF-mediated switch from RELA to SOX4 binding in the 3′ UTR of Sox4 and Sox11.","method":"ChIP-seq, RNA-seq from SoxC-knockout FLS, co-immunoprecipitation","journal":"Frontiers in immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus RNA-seq from KO plus Co-IP, multiple orthogonal methods in single lab","pmids":["35529852"],"is_preprint":false},{"year":2022,"finding":"SOX4 promotes beige adipocyte thermogenesis by binding PPARγ as a coactivator, and recruiting PRDM16 to PPARγ to form a transcriptional complex that elevates thermogenic gene (including Ucp1) expression; adipocyte-specific or UCP1+ cell-specific deletion of SOX4 causes cold intolerance, decreased energy expenditure, obesity, and impaired thermogenic gene expression.","method":"Adipocyte-specific conditional KO mice (two models), endogenous and exogenous Co-IP, ChIP-qPCR, FAIRE assay, luciferase reporter assays, indirect calorimetry","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO plus Co-IP (endogenous) plus ChIP plus chromatin accessibility, multiple orthogonal methods and in vivo validation","pmids":["36451857"],"is_preprint":false},{"year":2022,"finding":"SOX4 is required for thymic tuft cell development; Sox4 deficiency specifically in thymic epithelial cells markedly reduces thymic tuft cells without affecting Aire+ or Ccl21a+ mTEC subsets; LTβR acts upstream of Sox4 in this differentiation axis.","method":"TEC-specific Sox4 conditional knockout mice, flow cytometry, genetic epistasis with LTβR-deficient mice","journal":"International immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — TEC-specific conditional KO with genetic epistasis, clean phenotypic readout","pmids":["34687536"],"is_preprint":false},{"year":2022,"finding":"METTL3-mediated m6A modification of SOX4 mRNA at CDS regions promotes SOX4 mRNA stability and expression; YTHDF3 is the m6A reader that recognizes modified SOX4 mRNA and modulates its stability/protein levels; this axis regulates osteoblast proliferation and differentiation.","method":"MeRIP-seq, RNA-seq, RIP assay (confirming METTL3-SOX4 interaction), YTHDF3 knockdown, METTL3 knockdown/OVX mouse model with AAV2-SOX4 rescue","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 1 / Moderate — MeRIP-seq plus RIP assay plus in vivo rescue experiment, multiple orthogonal methods in single lab","pmids":["38195035"],"is_preprint":false},{"year":2024,"finding":"SOX4 acts as a pioneer factor in adult mouse liver: it initially directly binds and closes hepatocyte regulatory sequences via an overlapping motif with HNF4A (a hepatocyte master regulator), and subsequently exerts pioneer factor activity to open biliary regulatory sequences, thereby initiating hepatobiliary metaplasia.","method":"Lineage tracing, ATAC-seq (chromatin accessibility), ChIP-seq, SOX4 overexpression in adult liver, timing of chromatin opening vs. closing","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ATAC-seq plus ChIP-seq plus lineage tracing, multiple orthogonal methods demonstrating pioneer factor mechanism in vivo","pmids":["38409161"],"is_preprint":false},{"year":2024,"finding":"SOX4 directly modulates EZH2 expression, which in turn suppresses SLC7A11 through H3K27me3, driving ferroptosis in calcium oxalate crystal-induced kidney injury; the SOX4/EZH2/SLC7A11 axis was confirmed by ChIP assay.","method":"RNA-seq, single-nucleus RNA-seq, ChIP assay, EZH2 KO and inhibitor studies, in vitro and in vivo CaOx models","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP assay plus KO/inhibitor studies plus RNA-seq, single lab","pmids":["38169402"],"is_preprint":false},{"year":2015,"finding":"SOX4 expression is required for Schwann cell myelination; transgenic overexpression of Sox4 in Schwann cells causes a temporary delay in PNS myelination without affecting axonal sorting, and aggravates neuropathic phenotype in a Charcot-Marie-Tooth 4C model. Sox4 protein expression in Schwann cells is strictly post-transcriptionally regulated despite mRNA overexpression.","method":"Transgenic Sox4 overexpression in Schwann cells, myelination analysis, CMT4C mouse model, western blot protein analysis","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic mouse model with functional myelination readout, single lab","pmids":["25899854"],"is_preprint":false},{"year":2015,"finding":"SOX4 directly binds to the SOX4 binding motif in the Cyr61 proximal promoter and up-regulates Cyr61 (an extracellular matrix-associated signaling protein) expression in colon cancer cells; knockdown of Sox4 reduces Cyr61 expression.","method":"PCR-based microarray, siRNA knockdown, luciferase reporter assay, ChIP assay","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter assay plus knockdown, single lab","pmids":["25059387"],"is_preprint":false},{"year":2018,"finding":"FHL3 interacts with the Smad2/3 protein complex at the SOX4 promoter region, inhibits SOX4 transcriptional activity by recruiting PPM1A phosphatase to Smad2/3, and thereby suppresses glioma stem cell (GSC) self-renewal via downregulation of SOX2.","method":"Co-immunoprecipitation, ChIP assay, promoter reporter assay, sphere formation assay, in vivo tumor model","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP showing complex at SOX4 promoter plus functional sphere assays, single lab","pmids":["29955125"],"is_preprint":false},{"year":2020,"finding":"SOX4 directly binds to the promoter of the Anillin gene and activates its transcription; SP1 acts as an upstream activator of SOX4; this SOX4-Anillin axis facilitates HCC cell proliferation and tumor growth.","method":"ChIP assay (SOX4 binding to Anillin promoter), gain/loss-of-function, in vivo tumor model","journal":"Translational oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP assay plus functional in vitro/in vivo studies, single lab","pmids":["32645689"],"is_preprint":false},{"year":2019,"finding":"MTA1 acts upstream of SOX4 in the TGF-β pathway; both MTA1 and SOX4 are induced by TGF-β and are indispensable for TGF-β-mediated EMT; EZH2 is a critical downstream responsive gene of the TGF-β-MTA1-SOX4 cascade.","method":"Gene expression profiling, shRNA knockdown/overexpression in multiple cell lines, TCGA pan-cancer analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis established by knockdown in multiple cell lines with pathway placement, single lab","pmids":["31811272"],"is_preprint":false},{"year":2024,"finding":"SOX4 drives NSCLC progression by transcriptionally activating BMI1; SOX4-induced BMI1 promotes ubiquitination of histone H2A (H2Aub), leading to decreased ZNF24 expression, which triggers VEGF-A secretion and promotes angiogenesis in NSCLC.","method":"In vitro overexpression/knockdown, ChIP (SOX4 binding to BMI1 promoter), orthotopic in vivo models, functional angiogenesis assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional in vitro/in vivo studies, single lab","pmids":["39349443"],"is_preprint":false}],"current_model":"SOX4 is a context-dependent transcriptional activator and repressor that binds DNA through its HMG box domain, transactivates target genes via a conserved C-terminal TAD, forms complexes with co-regulators (including TCF/LEF, beta-catenin, EZH2/HDAC3, SMARCA4, PPARγ/PRDM16, p53/p300/CBP, and RELA), stabilizes p53 by blocking Mdm2-mediated ubiquitination, acts as a pioneer factor to remodel chromatin, regulates a Pol III-dependent tRNA subset, and controls key cellular processes including EMT, Wnt/beta-catenin signaling, PI3K/Akt activity, beta-cell proliferation (via Cdkn1a repression), immune cell differentiation (iNKT, Treg, thymic tuft cells, pro-B cells), insulin secretion (via STXBP6-mediated kiss-and-run exocytosis), and tissue-specific differentiation programs; its mRNA stability is itself regulated by m6A modifications deposited by METTL3/METTL14 and read by YTHDF2/YTHDF3."},"narrative":{"mechanistic_narrative":"SOX4 is a sequence-specific transcription factor that binds DNA through its HMG box and activates transcription via a conserved C-terminal transactivation domain shared with the SoxC family, functioning as a context-dependent activator or repressor that orchestrates cell proliferation, differentiation, and migration programs across many tissues [PMID:18403418, PMID:30661772]. De novo missense variants in its HMG DNA-binding domain abolish DNA binding and transactivation, causing a neurodevelopmental syndrome and establishing loss of DNA-binding activity as a pathogenic mechanism [PMID:30661772]. Mechanistically, SOX4 directs transcription both by recruiting chromatin-modifying machinery and by acting as a pioneer factor: it partners with SMARCA4 to maintain open chromatin at TGFBR2 to sustain PI3K/Akt signaling [PMID:33837205], forms a co-repressor complex with EZH2 and HDAC3 to silence loci such as miR-31 through H3K27me3 [PMID:25644061], and in adult liver binds and closes hepatocyte regulatory sequences before opening biliary regulatory sequences to drive hepatobiliary metaplasia [PMID:38409161]. A recurrent theme is SOX4's position downstream of TGF-β signaling, where it is required for TGF-β-induced epithelial-mesenchymal transition and mesenchymal gene expression, cooperating with partners including MTA1 and EZH2 and acting through targets such as TMEM2 and FSCN1 [PMID:22787120, PMID:23301048, PMID:31811272, PMID:27328729, PMID:31492871]. SOX4 integrates with Wnt signaling by stabilizing beta-catenin and enhancing beta-catenin/TCF transcriptional output [PMID:17875931, PMID:21165564], and stabilizes p53 by blocking Mdm2-mediated ubiquitination while promoting p300/CBP-dependent p53 acetylation [PMID:19234109]. Beyond protein-coding gene control, SOX4 represses a subset of RNA polymerase III-transcribed tRNA genes by impeding TBP and Pol III recruitment [PMID:32123087]. In vivo, SOX4 governs diverse differentiation and homeostatic programs, including beta-cell proliferation via direct Cdkn1a repression and insulin secretion via STXBP6 [PMID:28495880, PMID:26993066], pro-B cell survival, iNKT, Treg, and thymic tuft cell development [PMID:23345330, PMID:30287480, PMID:32319705, PMID:34687536], intestinal tuft and enteroendocrine lineage allocation [PMID:30055169], and beige adipocyte thermogenesis through a PPARγ/PRDM16 coactivator complex [PMID:36451857]. SOX4 expression is itself tightly controlled post-transcriptionally by m6A modification, where METTL14/YTHDF2 promote SOX4 mRNA decay and METTL3/YTHDF3 promote SOX4 mRNA stability [PMID:32552762, PMID:38195035].","teleology":[{"year":2007,"claim":"Established that SOX4 is not just a DNA-binding factor but an active modulator of Wnt signaling, linking it to beta-catenin/TCF transcriptional output and proliferation.","evidence":"Gain/loss-of-function, reciprocal Co-IP and reporter assays in SW480 colon carcinoma cells","pmids":["17875931"],"confidence":"High","gaps":["Mechanism of beta-catenin stabilization not resolved here","Direct vs. indirect TCF/LEF cooperation on chromatin unclear"]},{"year":2008,"claim":"Defined the structural basis of SOX4 transactivation by mapping a conserved 33-residue C-terminal TAD shared across SoxC proteins, explaining differential activation strength.","evidence":"Deletion mutagenesis, reporter transactivation, and TAD structural analysis","pmids":["18403418"],"confidence":"High","gaps":["Coactivators recruited by the TAD not identified","No structure of full-length DNA-bound SOX4"]},{"year":2009,"claim":"Showed SOX4 feeds into the DNA-damage response by stabilizing p53, positioning it as a tumor-suppressive node in some contexts.","evidence":"Co-IP, ubiquitination assays, apoptosis/cell cycle assays in cell lines and tumorigenesis models","pmids":["19234109"],"confidence":"High","gaps":["Reconciliation with SOX4's oncogenic roles in other tissues unresolved","Direct interaction interface with p53/Mdm2 not mapped"]},{"year":2012,"claim":"Identified SOX4 as a required effector of TGF-β-induced EMT and an oncogenic cooperator with Ras, defining its core role in mesenchymal transition.","evidence":"Ectopic overexpression, shRNA knockdown, xenografts, TGF-β pathway assays in mammary epithelial cells","pmids":["22787120","23301048"],"confidence":"High","gaps":["SOX4 alone induces mesenchymal markers but not full EMT","Direct EMT target genes only partially defined"]},{"year":2013,"claim":"Demonstrated SOX4 is essential for pro-B cell survival via Src/Bcl2, extending its role from cancer EMT to immune cell development.","evidence":"Conditional Sox4 knockout mice with Bcl2 transgene rescue and apoptosis assays","pmids":["23345330"],"confidence":"High","gaps":["Direct SOX4 target genes upstream of Bcl2 not defined","Partial rescue indicates additional survival effectors"]},{"year":2013,"claim":"Established direct promoter-level target gene control in a differentiation program by showing SOX4 activates Cald1 to drive myoblast fusion.","evidence":"Gel shift, promoter analysis, knockdown/overexpression with caldesmon rescue in C2C12 and embryonic muscle","pmids":["24046453"],"confidence":"High","gaps":["Cofactors at the Cald1 promoter unknown"]},{"year":2015,"claim":"Revealed that SOX4 represses targets through recruitment of chromatin-silencing machinery, forming an EZH2/HDAC3 co-repressor complex.","evidence":"Co-IP, ChIP, methylation studies and invasion assays in esophageal cancer cells","pmids":["25644061"],"confidence":"High","gaps":["Determinants of activator vs. repressor mode not defined","miR-31/SOX4 feedback dynamics in vivo unclear"]},{"year":2016,"claim":"Connected SOX4 to insulin secretion, showing it restricts hormone release by upregulating STXBP6 to promote kiss-and-run exocytosis.","evidence":"Mutant Sox4 mouse, single-granule exocytosis measurements, STXBP6 siRNA rescue, human islets","pmids":["26993066"],"confidence":"High","gaps":["Whether STXBP6 is a direct SOX4 transcriptional target not established"]},{"year":2017,"claim":"Showed SOX4 enables facultative beta-cell proliferation through direct repression of the cell-cycle inhibitor Cdkn1a, with diabetes resulting from its loss.","evidence":"Inducible beta-cell-specific Sox4 knockout mice with Cdkn1a expression analysis","pmids":["28495880"],"confidence":"High","gaps":["Direct SOX4 binding at Cdkn1a not shown here"]},{"year":2017,"claim":"Demonstrated context-dependent repressor activity in development, with SOX4 repressing Sox9 via the TESCO enhancer to influence gonad and germ cell differentiation.","evidence":"Sox4 conditional knockout mice and TESCO reporter assays","pmids":["28118982"],"confidence":"Medium","gaps":["Cofactors enabling repression at TESCO unknown","Single lab"]},{"year":2018,"claim":"Established SOX4 as a lineage allocation factor in the intestine, driving tuft/enteroendocrine fates independently of Atoh1.","evidence":"Conditional KO mice, organoids, scRNA-seq, helminth infection, Atoh1 epistasis","pmids":["30055169","30287480"],"confidence":"High","gaps":["Direct SOX4 target genes for tuft fate not fully mapped"]},{"year":2019,"claim":"Mapped SOX4 into upstream regulatory cascades (MTA1, ERG, C-MYC) and identified migration targets (FSCN1) in wound repair and cancer.","evidence":"ChIP, Co-IP, knockdown/overexpression in wound, prostate and multiple cancer models","pmids":["31811272","24435928","31560094","31492871","31238254"],"confidence":"Medium","gaps":["Direct vs. indirect placement in cascades varies by study","Most are single-lab epistasis"]},{"year":2019,"claim":"Defined the pathogenic mechanism of SOX4-linked neurodevelopmental disease as loss of DNA binding by HMG-domain missense variants.","evidence":"Trio exome sequencing, in vitro DNA binding/transactivation assays, Xenopus knockdown","pmids":["30661772"],"confidence":"High","gaps":["Critical neural target genes driving the syndrome unknown"]},{"year":2020,"claim":"Uncovered an unexpected Pol III-directed function, with SOX4 repressing specific tRNA genes by blocking TBP/Pol III recruitment.","evidence":"Genome-wide ChIP-seq, CRISPR tRNAi knockdown and rescue in glioblastoma cells","pmids":["32123087"],"confidence":"High","gaps":["How an HMG factor docks at tRNA loci to exclude Pol III machinery not structurally defined"]},{"year":2020,"claim":"Showed SOX4 expression is governed post-transcriptionally by m6A, with METTL14/YTHDF2 promoting SOX4 mRNA decay.","evidence":"MeRIP-seq, RIP, METTL14 knockdown/overexpression and YTHDF2 assays","pmids":["32552762"],"confidence":"High","gaps":["Signals controlling m6A deposition on SOX4 mRNA unknown"]},{"year":2020,"claim":"Extended SOX4's TGF-β axis to immune evasion and Treg function, controlling immune gene programs and CD39 expression.","evidence":"SOX4 inactivation, integrin blockade, murine TNBC models; CRISPR KO/overexpression in Treg","pmids":["33385331","32319705"],"confidence":"High","gaps":["Direct immune-gene targets of SOX4 not fully mapped","CD39 directness not established"]},{"year":2021,"claim":"Established SOX4 as a chromatin-remodeling partner of SMARCA4 that maintains accessibility at TGFBR2 to sustain PI3K/Akt signaling.","evidence":"Co-IP, ChIP, ATAC-seq and TGFBR2 rescue in triple-negative breast cancer","pmids":["33837205"],"confidence":"High","gaps":["Whether SMARCA4 recruitment is direct via SOX4 not resolved"]},{"year":2022,"claim":"Defined SOX4's co-regulator partnerships in physiology: a PPARγ/PRDM16 thermogenic complex in adipocytes and chromatin co-binding with RELA in inflammation.","evidence":"Adipocyte-specific KO, Co-IP, ChIP, calorimetry; ChIP-seq/RNA-seq/Co-IP in synoviocytes","pmids":["36451857","35529852"],"confidence":"High","gaps":["Determinants of SOX4-RELA co-binding selectivity unclear"]},{"year":2022,"claim":"Showed SOX4 stabilizes the progesterone receptor by repressing HERC4-mediated degradation, a non-transcriptional protein-stability role required for decidualization.","evidence":"ChIP-seq, RNA-seq, IP-MS and decidualization assays in endometrial stromal cells","pmids":["35244538"],"confidence":"High","gaps":["How SOX4 represses HERC4 mechanistically not fully defined"]},{"year":2024,"claim":"Demonstrated bona fide pioneer factor activity, with SOX4 sequentially closing hepatocyte and opening biliary regulatory chromatin to drive metaplasia.","evidence":"Lineage tracing, ATAC-seq, ChIP-seq with SOX4 overexpression in adult liver","pmids":["38409161"],"confidence":"High","gaps":["Cofactors enabling the close-then-open transition unknown"]},{"year":2024,"claim":"Linked SOX4 to a second m6A regulatory mode (METTL3/YTHDF3-stabilized) and to EZH2-driven ferroptosis and BMI1-driven angiogenesis programs.","evidence":"MeRIP-seq/RIP with in vivo rescue; ChIP and KO/inhibitor studies in osteoblast, kidney and NSCLC models","pmids":["38195035","38169402","39349443"],"confidence":"High","gaps":["Tissue-specific switch between stabilizing and destabilizing m6A readers not resolved","EZH2/BMI1 axes partly single-lab"]},{"year":null,"claim":"What molecular determinants switch SOX4 between activator, repressor, and pioneer modes, and how cofactor choice is dictated across tissues, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of SOX4 bound to DNA with a cofactor","Rules governing 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SOX4's TAD activates transcription less efficiently than SOX11 due to less stable alpha-helical structure.\",\n      \"method\": \"Deletion mutagenesis, reporter gene transactivation assays, structural analysis of TAD\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis plus functional reporter assays with structural validation in single lab, multiple orthogonal methods\",\n      \"pmids\": [\"18403418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SOX4 is induced by DNA damage, interacts with p53 protein, blocks Mdm2-mediated p53 ubiquitination and degradation thereby stabilizing p53, and enhances p53 acetylation by facilitating formation of a p300/CBP/p53 complex. These activities promote cell cycle arrest and apoptosis in a p53-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, apoptosis/cell cycle assays, gain/loss-of-function in cell lines and in vivo tumorigenesis models\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, multiple orthogonal functional assays in single lab\",\n      \"pmids\": [\"19234109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SOX4 stabilizes beta-catenin protein (without inducing its transcription) by inducing CK2 expression, thereby enhancing beta-catenin/TCF activity and cyclin D1 levels in a dose-dependent manner.\",\n      \"method\": \"SOX4 overexpression and siRNA knockdown, western blot, luciferase reporter assay\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, western blot plus reporter assay, two orthogonal methods\",\n      \"pmids\": [\"21165564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SOX4 overexpression in immortalized mammary epithelial cells is sufficient to induce EMT and activate the TGF-β pathway; SOX4 is required for TGF-β-induced EMT, and cooperates with oncogenic Ras to promote tumorigenesis in vivo.\",\n      \"method\": \"Ectopic overexpression, shRNA knockdown, xenograft mouse models, TGF-β pathway assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with in vivo validation, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"22787120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SOX4 positively regulates Dicer expression by binding to the Dicer promoter and enhancing its transcriptional activity, thereby suppressing melanoma cell invasion through regulation of miRNA biogenesis.\",\n      \"method\": \"Promoter binding assay (gel mobility shift), luciferase reporter assay, shRNA knockdown, Matrigel invasion assay, tissue microarray\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gel shift plus reporter plus functional invasion assay, single lab, multiple methods\",\n      \"pmids\": [\"22689055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SOX4 mediates TGF-β-induced expression of mesenchymal markers (N-cadherin, vimentin, fibronectin) in human mammary epithelial cells; conditional activation of SOX4 is sufficient to induce these markers but not complete EMT (no change in E-cadherin or beta-catenin); shRNA-mediated knockdown of SOX4 significantly delays TGF-β-induced mesenchymal gene expression.\",\n      \"method\": \"Conditional SOX4 activation system, shRNA knockdown, qRT-PCR, western blot\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inducible system plus knockdown, multiple markers assessed, single lab\",\n      \"pmids\": [\"23301048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SOX4 is required for the survival of pro-B cells; SOX4-deficient pro-B cells undergo apoptosis, show decreased activation of Src downstream of c-Kit, and have reduced Bcl2 levels. Restoration of Bcl2 partially rescues pro-B cell survival and B cell maturation in the absence of Sox4.\",\n      \"method\": \"Conditional Sox4 knockout mice, flow cytometry, apoptosis assays, Bcl2 transgene rescue experiment\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO mouse model with genetic rescue, multiple orthogonal readouts\",\n      \"pmids\": [\"23345330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SOX4 promotes skeletal myoblast differentiation by transcriptionally activating caldesmon (Cald1) expression; Sox4 binds to the Cald1 promoter; knockdown of Sox4 reduces caldesmon synthesis and myoblast fusion, while overexpression of caldesmon in Sox4-silenced cells rescues differentiation.\",\n      \"method\": \"Promoter analysis, gel mobility shift assay, siRNA knockdown, overexpression, C2C12 differentiation assays, mouse embryonic muscle experiments\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct promoter binding plus functional rescue in both cell line and in vivo model, single lab\",\n      \"pmids\": [\"24046453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ERG transcriptionally regulates SOX4 expression via binding to its promoter; ERG and SOX4 physically interact and cooperate in TGF-β1-induced EMT in prostate cancer cells. TGF-β1 increases active chromatin marks (H3K4me3, H4K16ac) and decreases H3K27me3 at ERG and SOX4 promoters.\",\n      \"method\": \"Co-immunoprecipitation, ChIP assay, siRNA knockdown, EMT functional assays\",\n      \"journal\": \"The Prostate\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP plus functional assays, single lab\",\n      \"pmids\": [\"24435928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SOX4 promotes esophageal cancer cell invasion by forming a co-repressor complex with EZH2 and HDAC3 that binds the miR-31 promoter, silencing miR-31 through H3K27me3 and histone deacetylation; miR-31 in turn targets SOX4 mRNA for degradation, creating a feedback loop.\",\n      \"method\": \"Co-immunoprecipitation, ChIP assay, methylation studies, overexpression and shRNA knockdown, migration/invasion assays\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of complex plus ChIP at miR-31 promoter, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"25644061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SOX4 directly transcriptionally activates TMEM2; TMEM2 mediates SOX4-dependent pro-invasive and pro-migratory effects and metastatic colonization in breast cancer cells.\",\n      \"method\": \"Systematic genomic/molecular approach, ChIP-seq, functional invasion/migration assays, gain/loss-of-function\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus functional validation, single lab\",\n      \"pmids\": [\"27328729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Increased SOX4 expression reduces insulin secretion by increasing kiss-and-run exocytosis (fusion pore restricted to ~2 nm diameter, preventing insulin exit) through upregulation of STXBP6; silencing STXBP6 reverses the SOX4-mediated inhibition of hormone release.\",\n      \"method\": \"Mutant Sox4 mouse model, single-granule exocytosis measurements, microarray, SOX4 overexpression in EndoC-βH2 cells, STXBP6 siRNA rescue, human islet preparations (n=63)\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo mouse model plus single-granule exocytosis measurements plus human islet validation plus genetic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"26993066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX4 allows facultative beta-cell proliferation through direct repression of Cdkn1a (p21); Sox4 conditional knockout mice develop progressive diabetes due to reduced beta-cell proliferation caused by Cdkn1a induction.\",\n      \"method\": \"Inducible beta-cell-specific Sox4 knockout mouse model, immunostaining for beta-cell mass, gene expression analysis, Cdkn1a regulation studies\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible conditional KO in vivo with gene expression mechanistic follow-up, replicates prior diabetes association finding\",\n      \"pmids\": [\"28495880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX4 transcriptionally upregulates the miR-17-92 cluster in prostate cancer cells, which in turn downregulates RB1 protein expression, promoting cell proliferation, migration, invasion, and neuroendocrine phenotype.\",\n      \"method\": \"High-throughput miRNA profiling, ChIP/luciferase assays for SOX4 binding to miR-17-92 locus, functional knockdown studies\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional assays, single lab\",\n      \"pmids\": [\"31238254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX4 directly binds ADAMTS4 and Adamts5 gene promoters and up-regulates their expression in chondrogenic cells; overexpression of Sox4 via adenovirus in mouse femoral head cartilage organ cultures causes articular cartilage destruction with increased Adamts5 expression.\",\n      \"method\": \"Luciferase reporter assay, ChIP assay, adenovirus-mediated overexpression, organ culture experiments\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct promoter binding confirmed by ChIP plus reporter, with in vitro and ex vivo functional validation, single lab\",\n      \"pmids\": [\"30016600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX4 represses Sox9 transcription via the upstream testis-specific enhancer core (TESCO) element in fetal gonads, acting as a transcriptional repressor in a context-dependent manner. Sox4 deficiency results in elongated gonads, increased testis cords, and impaired male germ cell differentiation markers (reduced Nanos2 and Dnmt3l).\",\n      \"method\": \"Sox4 conditional knockout mice, reporter assays with TESCO element, gene expression profiling\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse model plus reporter assay, single lab\",\n      \"pmids\": [\"28118982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SOX4 controls iNKT cell differentiation in the thymus by inducing MicroRNA-181 (Mir181) expression to enhance TCR signaling and Ca2+ fluxes in iNKT precursors.\",\n      \"method\": \"Genetic analysis, miRNA profiling, Ca2+ flux assays, gain/loss-of-function in developing thymocytes\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays with defined molecular mechanism, single lab\",\n      \"pmids\": [\"30287480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Sox4 promotes tuft and enteroendocrine cell lineage allocation in the intestine independently of Atoh1; Sox4 conditional knockout mice show impaired ISC function and reduced tuft/enteroendocrine cell numbers; overexpression of Sox4 is sufficient to induce tuft and enteroendocrine differentiation even in the absence of Atoh1.\",\n      \"method\": \"Sox4 conditional intestinal-specific knockout mice, organoids, single-cell RNA-seq, IL-13 stimulation, helminth infection model, Atoh1 inducible KO organoids with SOX4 overexpression\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO mouse model, inducible overexpression, genetic epistasis with Atoh1, in vivo infection model, multiple orthogonal approaches\",\n      \"pmids\": [\"30055169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SOX11 and SOX4 drive reactivation of an embryonic gene program during wound repair; SOX4 directly targets FSCN1 (fascin) to regulate cell migration; deficiency of Sox11 and Sox4 accelerates differentiation and dramatically impairs cell motility and re-epithelialization.\",\n      \"method\": \"Mouse wound model, Sox4/Sox11 deficiency studies, ChIP, gene expression analysis, cell motility assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo wound model with direct target identification by ChIP, multiple orthogonal methods\",\n      \"pmids\": [\"31492871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MTA1 acts upstream of SOX4 in TGF-β-mediated EMT; a TGF-β-MTA1-SOX4-EZH2 signaling cascade drives EMT, where SOX4 is required for both MTA1-driven and TGF-β-driven EMT, and EZH2 is a critical downstream responsive gene of this axis.\",\n      \"method\": \"Gene expression profiling, shRNA knockdown, overexpression in multiple cancer cell lines, TCGA/cDNA microarray validation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis established by knockdown in multiple cell lines, single lab, validated in patient data\",\n      \"pmids\": [\"31811272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"C-MYC transcriptionally activates SOX4 by binding to its promoter; C-MYC and SOX4 proteins physically interact in prostate cancer cells.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, Co-immunoprecipitation\",\n      \"journal\": \"Medical oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus Co-IP plus reporter assay, single lab\",\n      \"pmids\": [\"31560094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"De novo heterozygous missense variants in the HMG DNA-binding domain of SOX4 cause a neurodevelopmental syndrome; these variant proteins are unable to bind DNA in vitro and fail to transactivate SOX reporter genes in cultured cells, establishing loss of DNA-binding activity as the pathogenic mechanism.\",\n      \"method\": \"Trio-based exome sequencing, in vitro DNA binding assays, luciferase reporter transactivation assays, Xenopus sox4 knockdown\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro DNA binding plus transactivation assays plus in vivo Xenopus model, multiple orthogonal methods in single study\",\n      \"pmids\": [\"30661772\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"METTL14-mediated m6A modification of SOX4 mRNA promotes its degradation via the YTHDF2-dependent pathway; knockdown of METTL14 abolishes SOX4 mRNA m6A modification and elevates SOX4 mRNA expression.\",\n      \"method\": \"MeRIP-Seq, RNA immunoprecipitation, METTL14 knockdown/overexpression, YTHDF2 pathway assays\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — MeRIP-Seq plus RIP assay plus functional validation, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"32552762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SOX4 expression is regulated by the integrin αvβ6 receptor on TNBC cells, which activates TGF-β from a latent precursor; this integrin αvβ6-TGF-β-SOX4 pathway drives immune evasion. Inactivation of SOX4 increases expression of innate and adaptive immune pathway genes; an integrin αvβ6/8-blocking monoclonal antibody inhibits SOX4 expression.\",\n      \"method\": \"SOX4 inactivation in tumor cells, gene expression profiling, integrin blocking antibody, murine TNBC models\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway epistasis established with mechanistic studies plus in vivo model, multiple orthogonal methods\",\n      \"pmids\": [\"33385331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SOX4 directly controls expression of a subset of tRNA genes (including tRNAi) via RNA polymerase III; SOX4 binds specific tRNA gene loci (identified by ChIP-seq) and impedes recruitment of TATA box binding protein and Pol III, thereby repressing tRNA expression and inhibiting cell proliferation in glioblastoma cells.\",\n      \"method\": \"ChIP-seq (genome-wide SOX4 binding), CRISPR/Cas9 tRNAi knockdown, ectopic tRNAi rescue, glioblastoma proliferation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP-seq plus CRISPR KD plus rescue experiment, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"32123087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TGF-β mediates upregulation of CD39 expression on regulatory T cells via SOX4 as a downstream transcription factor; overexpression of SOX4 in Treg strongly increases CD39 expression, and CRISPR/Cas9-mediated knockout of SOX4 in Treg decreases CD39 expression.\",\n      \"method\": \"SOX4 overexpression, CRISPR/Cas9 knockout in Treg, flow cytometry, TGF-β/mTOR pathway assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO plus overexpression with defined phenotypic readout, single lab\",\n      \"pmids\": [\"32319705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SOX4 and SMARCA4 form a complex required to maintain open chromatin at TGFBR2 regulatory regions; this SOX4-SMARCA4 complex directly transcriptionally activates TGFBR2, which is required for SOX4-dependent PI3K/Akt signaling in triple-negative breast cancer.\",\n      \"method\": \"Co-immunoprecipitation, ChIP assay, ATAC-seq/chromatin accessibility assay, TGFBR2 knockdown rescue, genomic/proteomic analyses\",\n      \"journal\": \"NPJ breast cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP plus chromatin accessibility assay plus functional rescue, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"33837205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CRISPR/Cas9-mediated loss of SOX4 in mammary tumor organoids inhibits differentiation by regulating a subset of fetal mammary stem cell (fMaSC) genes; SOX4 is required for maintaining tumor cells in an undifferentiated and proliferative state, and its loss impairs primary tumor growth and metastatic outgrowth.\",\n      \"method\": \"CRISPR/Cas9 knockout in PyMT mouse mammary organoids, RNA-seq, in vivo tumor growth assays, competitive growth experiments\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO plus RNA-seq plus in vivo validation, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"34584219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SOX4 directly regulates FOXO1 expression (established by genome-wide SOX4 chromatin binding assay and RNA-seq) and modulates progesterone receptor (PGR) stability by repressing E3 ubiquitin ligase HERC4-mediated degradation, as identified by immunoprecipitation and mass spectrometry; this SOX4-HERC4-PGR axis is required for human endometrial stromal cell decidualization.\",\n      \"method\": \"Genome-wide ChIP-seq (SOX4 binding), RNA-seq, immunoprecipitation, mass spectrometry, functional decidualization assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP-seq plus IP-MS for complex identification plus functional decidualization assays, multiple orthogonal methods\",\n      \"pmids\": [\"35244538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SOX4 and RELA/p65 physically interact on chromatin; ChIP-seq reveals 70.4% of SOX4 peak summits are within 50 bp of RELA peak summits; together they co-operatively regulate TNF-responsive genes including inflammation mediators, histone remodeling enzymes and AP-1 pathway components in fibroblast-like synoviocytes. An autoregulatory mode involves TNF-mediated switch from RELA to SOX4 binding in the 3′ UTR of Sox4 and Sox11.\",\n      \"method\": \"ChIP-seq, RNA-seq from SoxC-knockout FLS, co-immunoprecipitation\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus RNA-seq from KO plus Co-IP, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"35529852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SOX4 promotes beige adipocyte thermogenesis by binding PPARγ as a coactivator, and recruiting PRDM16 to PPARγ to form a transcriptional complex that elevates thermogenic gene (including Ucp1) expression; adipocyte-specific or UCP1+ cell-specific deletion of SOX4 causes cold intolerance, decreased energy expenditure, obesity, and impaired thermogenic gene expression.\",\n      \"method\": \"Adipocyte-specific conditional KO mice (two models), endogenous and exogenous Co-IP, ChIP-qPCR, FAIRE assay, luciferase reporter assays, indirect calorimetry\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO plus Co-IP (endogenous) plus ChIP plus chromatin accessibility, multiple orthogonal methods and in vivo validation\",\n      \"pmids\": [\"36451857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SOX4 is required for thymic tuft cell development; Sox4 deficiency specifically in thymic epithelial cells markedly reduces thymic tuft cells without affecting Aire+ or Ccl21a+ mTEC subsets; LTβR acts upstream of Sox4 in this differentiation axis.\",\n      \"method\": \"TEC-specific Sox4 conditional knockout mice, flow cytometry, genetic epistasis with LTβR-deficient mice\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TEC-specific conditional KO with genetic epistasis, clean phenotypic readout\",\n      \"pmids\": [\"34687536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3-mediated m6A modification of SOX4 mRNA at CDS regions promotes SOX4 mRNA stability and expression; YTHDF3 is the m6A reader that recognizes modified SOX4 mRNA and modulates its stability/protein levels; this axis regulates osteoblast proliferation and differentiation.\",\n      \"method\": \"MeRIP-seq, RNA-seq, RIP assay (confirming METTL3-SOX4 interaction), YTHDF3 knockdown, METTL3 knockdown/OVX mouse model with AAV2-SOX4 rescue\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — MeRIP-seq plus RIP assay plus in vivo rescue experiment, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"38195035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SOX4 acts as a pioneer factor in adult mouse liver: it initially directly binds and closes hepatocyte regulatory sequences via an overlapping motif with HNF4A (a hepatocyte master regulator), and subsequently exerts pioneer factor activity to open biliary regulatory sequences, thereby initiating hepatobiliary metaplasia.\",\n      \"method\": \"Lineage tracing, ATAC-seq (chromatin accessibility), ChIP-seq, SOX4 overexpression in adult liver, timing of chromatin opening vs. closing\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ATAC-seq plus ChIP-seq plus lineage tracing, multiple orthogonal methods demonstrating pioneer factor mechanism in vivo\",\n      \"pmids\": [\"38409161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SOX4 directly modulates EZH2 expression, which in turn suppresses SLC7A11 through H3K27me3, driving ferroptosis in calcium oxalate crystal-induced kidney injury; the SOX4/EZH2/SLC7A11 axis was confirmed by ChIP assay.\",\n      \"method\": \"RNA-seq, single-nucleus RNA-seq, ChIP assay, EZH2 KO and inhibitor studies, in vitro and in vivo CaOx models\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP assay plus KO/inhibitor studies plus RNA-seq, single lab\",\n      \"pmids\": [\"38169402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SOX4 expression is required for Schwann cell myelination; transgenic overexpression of Sox4 in Schwann cells causes a temporary delay in PNS myelination without affecting axonal sorting, and aggravates neuropathic phenotype in a Charcot-Marie-Tooth 4C model. Sox4 protein expression in Schwann cells is strictly post-transcriptionally regulated despite mRNA overexpression.\",\n      \"method\": \"Transgenic Sox4 overexpression in Schwann cells, myelination analysis, CMT4C mouse model, western blot protein analysis\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic mouse model with functional myelination readout, single lab\",\n      \"pmids\": [\"25899854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SOX4 directly binds to the SOX4 binding motif in the Cyr61 proximal promoter and up-regulates Cyr61 (an extracellular matrix-associated signaling protein) expression in colon cancer cells; knockdown of Sox4 reduces Cyr61 expression.\",\n      \"method\": \"PCR-based microarray, siRNA knockdown, luciferase reporter assay, ChIP assay\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter assay plus knockdown, single lab\",\n      \"pmids\": [\"25059387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FHL3 interacts with the Smad2/3 protein complex at the SOX4 promoter region, inhibits SOX4 transcriptional activity by recruiting PPM1A phosphatase to Smad2/3, and thereby suppresses glioma stem cell (GSC) self-renewal via downregulation of SOX2.\",\n      \"method\": \"Co-immunoprecipitation, ChIP assay, promoter reporter assay, sphere formation assay, in vivo tumor model\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP showing complex at SOX4 promoter plus functional sphere assays, single lab\",\n      \"pmids\": [\"29955125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SOX4 directly binds to the promoter of the Anillin gene and activates its transcription; SP1 acts as an upstream activator of SOX4; this SOX4-Anillin axis facilitates HCC cell proliferation and tumor growth.\",\n      \"method\": \"ChIP assay (SOX4 binding to Anillin promoter), gain/loss-of-function, in vivo tumor model\",\n      \"journal\": \"Translational oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP assay plus functional in vitro/in vivo studies, single lab\",\n      \"pmids\": [\"32645689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MTA1 acts upstream of SOX4 in the TGF-β pathway; both MTA1 and SOX4 are induced by TGF-β and are indispensable for TGF-β-mediated EMT; EZH2 is a critical downstream responsive gene of the TGF-β-MTA1-SOX4 cascade.\",\n      \"method\": \"Gene expression profiling, shRNA knockdown/overexpression in multiple cell lines, TCGA pan-cancer analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis established by knockdown in multiple cell lines with pathway placement, single lab\",\n      \"pmids\": [\"31811272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SOX4 drives NSCLC progression by transcriptionally activating BMI1; SOX4-induced BMI1 promotes ubiquitination of histone H2A (H2Aub), leading to decreased ZNF24 expression, which triggers VEGF-A secretion and promotes angiogenesis in NSCLC.\",\n      \"method\": \"In vitro overexpression/knockdown, ChIP (SOX4 binding to BMI1 promoter), orthotopic in vivo models, functional angiogenesis assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional in vitro/in vivo studies, single lab\",\n      \"pmids\": [\"39349443\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SOX4 is a context-dependent transcriptional activator and repressor that binds DNA through its HMG box domain, transactivates target genes via a conserved C-terminal TAD, forms complexes with co-regulators (including TCF/LEF, beta-catenin, EZH2/HDAC3, SMARCA4, PPARγ/PRDM16, p53/p300/CBP, and RELA), stabilizes p53 by blocking Mdm2-mediated ubiquitination, acts as a pioneer factor to remodel chromatin, regulates a Pol III-dependent tRNA subset, and controls key cellular processes including EMT, Wnt/beta-catenin signaling, PI3K/Akt activity, beta-cell proliferation (via Cdkn1a repression), immune cell differentiation (iNKT, Treg, thymic tuft cells, pro-B cells), insulin secretion (via STXBP6-mediated kiss-and-run exocytosis), and tissue-specific differentiation programs; its mRNA stability is itself regulated by m6A modifications deposited by METTL3/METTL14 and read by YTHDF2/YTHDF3.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SOX4 is a sequence-specific transcription factor that binds DNA through its HMG box and activates transcription via a conserved C-terminal transactivation domain shared with the SoxC family, functioning as a context-dependent activator or repressor that orchestrates cell proliferation, differentiation, and migration programs across many tissues [#1, #22]. De novo missense variants in its HMG DNA-binding domain abolish DNA binding and transactivation, causing a neurodevelopmental syndrome and establishing loss of DNA-binding activity as a pathogenic mechanism [#22]. Mechanistically, SOX4 directs transcription both by recruiting chromatin-modifying machinery and by acting as a pioneer factor: it partners with SMARCA4 to maintain open chromatin at TGFBR2 to sustain PI3K/Akt signaling [#27], forms a co-repressor complex with EZH2 and HDAC3 to silence loci such as miR-31 through H3K27me3 [#10], and in adult liver binds and closes hepatocyte regulatory sequences before opening biliary regulatory sequences to drive hepatobiliary metaplasia [#34]. A recurrent theme is SOX4's position downstream of TGF-\\u03b2 signaling, where it is required for TGF-\\u03b2-induced epithelial-mesenchymal transition and mesenchymal gene expression, cooperating with partners including MTA1 and EZH2 and acting through targets such as TMEM2 and FSCN1 [#4, #6, #20, #11, #19]. SOX4 integrates with Wnt signaling by stabilizing beta-catenin and enhancing beta-catenin/TCF transcriptional output [#0, #3], and stabilizes p53 by blocking Mdm2-mediated ubiquitination while promoting p300/CBP-dependent p53 acetylation [#2]. Beyond protein-coding gene control, SOX4 represses a subset of RNA polymerase III-transcribed tRNA genes by impeding TBP and Pol III recruitment [#25]. In vivo, SOX4 governs diverse differentiation and homeostatic programs, including beta-cell proliferation via direct Cdkn1a repression and insulin secretion via STXBP6 [#13, #12], pro-B cell survival, iNKT, Treg, and thymic tuft cell development [#7, #17, #26, #32], intestinal tuft and enteroendocrine lineage allocation [#18], and beige adipocyte thermogenesis through a PPAR\\u03b3/PRDM16 coactivator complex [#31]. SOX4 expression is itself tightly controlled post-transcriptionally by m6A modification, where METTL14/YTHDF2 promote SOX4 mRNA decay and METTL3/YTHDF3 promote SOX4 mRNA stability [#23, #33].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that SOX4 is not just a DNA-binding factor but an active modulator of Wnt signaling, linking it to beta-catenin/TCF transcriptional output and proliferation.\",\n      \"evidence\": \"Gain/loss-of-function, reciprocal Co-IP and reporter assays in SW480 colon carcinoma cells\",\n      \"pmids\": [\"17875931\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of beta-catenin stabilization not resolved here\", \"Direct vs. indirect TCF/LEF cooperation on chromatin unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the structural basis of SOX4 transactivation by mapping a conserved 33-residue C-terminal TAD shared across SoxC proteins, explaining differential activation strength.\",\n      \"evidence\": \"Deletion mutagenesis, reporter transactivation, and TAD structural analysis\",\n      \"pmids\": [\"18403418\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coactivators recruited by the TAD not identified\", \"No structure of full-length DNA-bound SOX4\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed SOX4 feeds into the DNA-damage response by stabilizing p53, positioning it as a tumor-suppressive node in some contexts.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, apoptosis/cell cycle assays in cell lines and tumorigenesis models\",\n      \"pmids\": [\"19234109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation with SOX4's oncogenic roles in other tissues unresolved\", \"Direct interaction interface with p53/Mdm2 not mapped\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified SOX4 as a required effector of TGF-\\u03b2-induced EMT and an oncogenic cooperator with Ras, defining its core role in mesenchymal transition.\",\n      \"evidence\": \"Ectopic overexpression, shRNA knockdown, xenografts, TGF-\\u03b2 pathway assays in mammary epithelial cells\",\n      \"pmids\": [\"22787120\", \"23301048\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SOX4 alone induces mesenchymal markers but not full EMT\", \"Direct EMT target genes only partially defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated SOX4 is essential for pro-B cell survival via Src/Bcl2, extending its role from cancer EMT to immune cell development.\",\n      \"evidence\": \"Conditional Sox4 knockout mice with Bcl2 transgene rescue and apoptosis assays\",\n      \"pmids\": [\"23345330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SOX4 target genes upstream of Bcl2 not defined\", \"Partial rescue indicates additional survival effectors\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established direct promoter-level target gene control in a differentiation program by showing SOX4 activates Cald1 to drive myoblast fusion.\",\n      \"evidence\": \"Gel shift, promoter analysis, knockdown/overexpression with caldesmon rescue in C2C12 and embryonic muscle\",\n      \"pmids\": [\"24046453\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors at the Cald1 promoter unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed that SOX4 represses targets through recruitment of chromatin-silencing machinery, forming an EZH2/HDAC3 co-repressor complex.\",\n      \"evidence\": \"Co-IP, ChIP, methylation studies and invasion assays in esophageal cancer cells\",\n      \"pmids\": [\"25644061\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of activator vs. repressor mode not defined\", \"miR-31/SOX4 feedback dynamics in vivo unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected SOX4 to insulin secretion, showing it restricts hormone release by upregulating STXBP6 to promote kiss-and-run exocytosis.\",\n      \"evidence\": \"Mutant Sox4 mouse, single-granule exocytosis measurements, STXBP6 siRNA rescue, human islets\",\n      \"pmids\": [\"26993066\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether STXBP6 is a direct SOX4 transcriptional target not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed SOX4 enables facultative beta-cell proliferation through direct repression of the cell-cycle inhibitor Cdkn1a, with diabetes resulting from its loss.\",\n      \"evidence\": \"Inducible beta-cell-specific Sox4 knockout mice with Cdkn1a expression analysis\",\n      \"pmids\": [\"28495880\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SOX4 binding at Cdkn1a not shown here\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated context-dependent repressor activity in development, with SOX4 repressing Sox9 via the TESCO enhancer to influence gonad and germ cell differentiation.\",\n      \"evidence\": \"Sox4 conditional knockout mice and TESCO reporter assays\",\n      \"pmids\": [\"28118982\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cofactors enabling repression at TESCO unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established SOX4 as a lineage allocation factor in the intestine, driving tuft/enteroendocrine fates independently of Atoh1.\",\n      \"evidence\": \"Conditional KO mice, organoids, scRNA-seq, helminth infection, Atoh1 epistasis\",\n      \"pmids\": [\"30055169\", \"30287480\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SOX4 target genes for tuft fate not fully mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mapped SOX4 into upstream regulatory cascades (MTA1, ERG, C-MYC) and identified migration targets (FSCN1) in wound repair and cancer.\",\n      \"evidence\": \"ChIP, Co-IP, knockdown/overexpression in wound, prostate and multiple cancer models\",\n      \"pmids\": [\"31811272\", \"24435928\", \"31560094\", \"31492871\", \"31238254\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect placement in cascades varies by study\", \"Most are single-lab epistasis\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined the pathogenic mechanism of SOX4-linked neurodevelopmental disease as loss of DNA binding by HMG-domain missense variants.\",\n      \"evidence\": \"Trio exome sequencing, in vitro DNA binding/transactivation assays, Xenopus knockdown\",\n      \"pmids\": [\"30661772\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Critical neural target genes driving the syndrome unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Uncovered an unexpected Pol III-directed function, with SOX4 repressing specific tRNA genes by blocking TBP/Pol III recruitment.\",\n      \"evidence\": \"Genome-wide ChIP-seq, CRISPR tRNAi knockdown and rescue in glioblastoma cells\",\n      \"pmids\": [\"32123087\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How an HMG factor docks at tRNA loci to exclude Pol III machinery not structurally defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed SOX4 expression is governed post-transcriptionally by m6A, with METTL14/YTHDF2 promoting SOX4 mRNA decay.\",\n      \"evidence\": \"MeRIP-seq, RIP, METTL14 knockdown/overexpression and YTHDF2 assays\",\n      \"pmids\": [\"32552762\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals controlling m6A deposition on SOX4 mRNA unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended SOX4's TGF-\\u03b2 axis to immune evasion and Treg function, controlling immune gene programs and CD39 expression.\",\n      \"evidence\": \"SOX4 inactivation, integrin blockade, murine TNBC models; CRISPR KO/overexpression in Treg\",\n      \"pmids\": [\"33385331\", \"32319705\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct immune-gene targets of SOX4 not fully mapped\", \"CD39 directness not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established SOX4 as a chromatin-remodeling partner of SMARCA4 that maintains accessibility at TGFBR2 to sustain PI3K/Akt signaling.\",\n      \"evidence\": \"Co-IP, ChIP, ATAC-seq and TGFBR2 rescue in triple-negative breast cancer\",\n      \"pmids\": [\"33837205\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SMARCA4 recruitment is direct via SOX4 not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined SOX4's co-regulator partnerships in physiology: a PPAR\\u03b3/PRDM16 thermogenic complex in adipocytes and chromatin co-binding with RELA in inflammation.\",\n      \"evidence\": \"Adipocyte-specific KO, Co-IP, ChIP, calorimetry; ChIP-seq/RNA-seq/Co-IP in synoviocytes\",\n      \"pmids\": [\"36451857\", \"35529852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of SOX4-RELA co-binding selectivity unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed SOX4 stabilizes the progesterone receptor by repressing HERC4-mediated degradation, a non-transcriptional protein-stability role required for decidualization.\",\n      \"evidence\": \"ChIP-seq, RNA-seq, IP-MS and decidualization assays in endometrial stromal cells\",\n      \"pmids\": [\"35244538\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SOX4 represses HERC4 mechanistically not fully defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated bona fide pioneer factor activity, with SOX4 sequentially closing hepatocyte and opening biliary regulatory chromatin to drive metaplasia.\",\n      \"evidence\": \"Lineage tracing, ATAC-seq, ChIP-seq with SOX4 overexpression in adult liver\",\n      \"pmids\": [\"38409161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors enabling the close-then-open transition unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked SOX4 to a second m6A regulatory mode (METTL3/YTHDF3-stabilized) and to EZH2-driven ferroptosis and BMI1-driven angiogenesis programs.\",\n      \"evidence\": \"MeRIP-seq/RIP with in vivo rescue; ChIP and KO/inhibitor studies in osteoblast, kidney and NSCLC models\",\n      \"pmids\": [\"38195035\", \"38169402\", \"39349443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific switch between stabilizing and destabilizing m6A readers not resolved\", \"EZH2/BMI1 axes partly single-lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"What molecular determinants switch SOX4 between activator, repressor, and pioneer modes, and how cofactor choice is dictated across tissues, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of SOX4 bound to DNA with a cofactor\", \"Rules governing activator vs. repressor recruitment undefined\", \"Generality of pioneer activity beyond liver untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 22, 8, 25, 34]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [22, 25, 34]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 29, 31]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [22, 25, 34]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [10, 25, 34]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 8, 25, 34]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 20, 27]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8, 16, 18, 31]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 17, 26, 32]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [10, 27, 34]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [23, 33, 25]}\n    ],\n    \"complexes\": [\n      \"SOX4-EZH2-HDAC3 co-repressor complex\",\n      \"SOX4-SMARCA4 chromatin complex\",\n      \"PPAR\\u03b3-PRDM16-SOX4 thermogenic complex\"\n    ],\n    \"partners\": [\n      \"CTNNB1\",\n      \"TP53\",\n      \"EZH2\",\n      \"SMARCA4\",\n      \"PPARG\",\n      \"PRDM16\",\n      \"RELA\",\n      \"TCF/LEF\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}