{"gene":"SOX8","run_date":"2026-06-10T07:46:38","timeline":{"discoveries":[{"year":2003,"finding":"SOX8 binds specifically to SOX binding sites within the Amh minimal promoter and activates Amh transcription synergistically with SF1 through direct protein-protein interaction, albeit at lower levels than SOX9.","method":"In vitro DNA binding assays, luciferase reporter assays, co-immunoprecipitation/protein-protein interaction assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro binding assay, reporter assay, and direct protein-protein interaction demonstrated in single rigorous study with multiple orthogonal methods","pmids":["12732652"],"is_preprint":false},{"year":2000,"finding":"SOX8 protein binds to canonical SOX target DNA sequences and activates transcription through two separate trans-activation regions located in the central part of the protein (distinct from the C-terminal location in SOX9/SOX10).","method":"In vitro transcription/reporter assays, protein domain mapping","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reporter assay with domain mapping, single lab, single study","pmids":["10684944"],"is_preprint":false},{"year":2004,"finding":"Double knockout analyses in mice show that Sox8 reinforces Sox9 function in testis differentiation; combined loss of Sox8 and Sox9 causes more severe defects than loss of Sox9 alone, establishing genetic redundancy between the two factors in Sertoli cell differentiation.","method":"Conditional gene targeting / double knockout mouse genetics, epistasis analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous double-mutant mouse genetics with defined cellular phenotype, replicated across related studies","pmids":["15056615"],"is_preprint":false},{"year":2004,"finding":"Sox8 binds to naturally occurring Sox10 response elements and forms DNA-dependent heterodimers with Sox10, activating Sox10-specific oligodendrocytic target genes; Sox8 and Sox10 act redundantly in terminal oligodendrocyte differentiation, with Sox8 having weaker impact due to lower expression levels.","method":"Electrophoretic mobility shift assay / DNA binding, heterodimer formation assay, reporter gene assays, Sox8-deficient mouse analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal methods (DNA binding, heterodimerization, reporter assays, knockout phenotype) in single rigorous study","pmids":["15102707"],"is_preprint":false},{"year":2005,"finding":"Sox8 acts as a modifier gene for Sox10-dependent enteric nervous system development; loss of Sox8 alleles in Sox10 heterozygous mice dramatically increases apoptosis in vagal neural crest cells, reducing the pool of undifferentiated progenitors required for gut colonization.","method":"Genetic epistasis (Sox8/Sox10 compound mutant mice), apoptosis assays, lineage analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — compound mutant mouse genetics with mechanistic cellular phenotype (apoptosis of vagal neural crest), multiple methods","pmids":["15572147"],"is_preprint":false},{"year":2005,"finding":"Combined loss of Sox8 and Sox9 in the embryonic spinal cord leads to near-complete loss of oligodendrocytes, while loss of Sox8 alone only enhances the Sox9-dependent defect, establishing that oligodendrocyte development relies on differential contribution of all three group E Sox proteins.","method":"Double knockout mouse genetics, cell counting, proliferation and apoptosis assays","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous double-knockout epistasis with quantitative cellular phenotype, replicated by related studies","pmids":["15893981"],"is_preprint":false},{"year":2005,"finding":"Sox8 negatively regulates osteoblast differentiation; Sox8-deficient mice show precocious osteoblast differentiation and low bone mass, and Sox8 overexpression under Col1a1 promoter strongly reduces Runx2 expression and impairs bone formation.","method":"Sox8 knockout and transgenic mouse models, bone histomorphometry, ex vivo osteoblast differentiation, qRT-PCR for Runx2","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain- and loss-of-function mouse models with defined molecular target (Runx2), multiple orthogonal methods","pmids":["15753123"],"is_preprint":false},{"year":2003,"finding":"Sox8 overexpression in myoblasts inhibits myotube formation, reduces MyoD and myogenin expression, and strongly reduces basal and MyoD-induced myogenin promoter activity, acting as a negative regulator of skeletal muscle differentiation by interfering with myogenic bHLH proteins.","method":"Overexpression in myoblast cell culture, luciferase reporter assay, Western blot/RT-PCR","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, differentiation phenotype, gene expression), single lab","pmids":["12782625"],"is_preprint":false},{"year":2006,"finding":"In Xenopus, morpholino-mediated knockdown of Sox8 delays the timing of neural crest induction at the neural plate border and prevents neural crest cell migration into the periphery, without affecting specification or survival of progenitors.","method":"Morpholino knockdown in Xenopus embryos, in situ hybridization, lineage tracing","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined cellular/migration phenotype, multiple readouts, single lab","pmids":["16943273"],"is_preprint":false},{"year":2006,"finding":"Replacement of Sox10 with Sox8 by targeted mutagenesis in mice shows incomplete functional equivalence: Sox8 almost fully rescues peripheral nervous system glia and neurons but fails to rescue melanocyte development, and only partially rescues enteric nervous system and oligodendrocyte defects.","method":"Targeted gene replacement (knock-in) mouse genetics, histological and molecular analysis of multiple lineages","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — knock-in replacement strategy in multiple tissues with quantitative phenotypic readouts, rigorous genetic design","pmids":["16790476"],"is_preprint":false},{"year":2008,"finding":"SOX8 protein is a product of adult Sertoli cells; its elimination causes age-dependent deregulation of spermatogenesis including spermatocyte/spermatid sloughing, spermiation failure, and progressive disorganization of the spermatogenic cycle, establishing SOX8 as a critical regulator of adult Sertoli cell function.","method":"Sox8 null mouse analysis, histological/cellular analysis, protein localization","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — detailed phenotypic and molecular analysis of knockout mouse with defined Sertoli cell localization, replicated by independent lab","pmids":["18342849"],"is_preprint":false},{"year":2009,"finding":"Adult Sox8-deficient mice develop progressive degeneration of adipose tissue, with elevated preadipocyte marker Pref-1 and impaired differentiation of Sox8-deficient fibroblasts to adipocytes in culture, which is rescued by reintroducing Sox8, suggesting a precursor-intrinsic role in adipocyte pool replenishment.","method":"Sox8 knockout mouse analysis, cell culture differentiation assay, rescue experiment by Sox8 re-expression","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout phenotype with in vitro rescue experiment, multiple methods, single lab","pmids":["19286648"],"is_preprint":false},{"year":2013,"finding":"SOX8 binds directly to the claudin-3 promoter (confirmed by ChIP) in Sertoli cells; Sox8-deficient mice have decreased claudin-3 protein, increased blood-testis barrier permeability (biotin tracer), and destabilized microtubule structures in testes.","method":"Chromatin immunoprecipitation, Western blot, biotin tracer permeability assay, electron microscopy","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP for direct promoter binding plus functional barrier permeability assay and ultrastructural analysis, single lab with multiple orthogonal methods","pmids":["23595903"],"is_preprint":false},{"year":2016,"finding":"Ablation of Sox9 in Sertoli cells of adult Sox8-null mice causes testis-to-ovary genetic reprogramming, with Sertoli cells transdifferentiating into granulosa-like cells; SOX9/8 maintain Dmrt1 expression and are required for adult testis maintenance.","method":"Conditional knockout mouse genetics (Sox9 ablation on Sox8-/- background), histology, immunostaining for lineage markers","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — compound conditional knockout with mechanistic pathway placement (Sox9/8→Dmrt1), replicated by related studies","pmids":["27328324"],"is_preprint":false},{"year":2020,"finding":"Aurora-A kinase directly binds SOX8 and phosphorylates it at Ser327, which enhances FOXK1 expression and regulates downstream genes related to cell senescence (hTERT, P16) and glycolysis (LDHA, HK2), promoting cisplatin resistance in ovarian cancer.","method":"Immunoprecipitation, mass spectrometry, FRET-FLIM, luciferase reporter assay, ChIP, in vitro phosphorylation assay","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct binding and phosphorylation site identified by IP/MS/FLIM with functional validation by reporter and ChIP, multiple orthogonal methods in single study","pmids":["32550913"],"is_preprint":false},{"year":2017,"finding":"SOX8 binds to the promoter region of Frizzled-7 (FZD7) and induces FZD7-mediated activation of the Wnt/β-catenin pathway, conferring chemoresistance and cancer stem-like properties in cisplatin-resistant tongue squamous cell carcinoma.","method":"Chromatin immunoprecipitation, luciferase reporter assay, SOX8 knockdown with functional rescue by active β-catenin","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assay for direct promoter binding plus functional rescue experiment, single lab","pmids":["29071717"],"is_preprint":false},{"year":2019,"finding":"Sox8 expression in intestinal M cells requires RANKL-RelB signaling; Sox8 directly binds the Gp2 promoter (by ChIP and luciferase assay) to drive Gp2 expression; Sox8-deficient mice have markedly fewer mature M cells and reduced antigen uptake and IgA responses.","method":"Sox8 knockout mouse, chromatin immunoprecipitation, luciferase reporter assay, flow cytometry, immunostaining","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct promoter binding by ChIP, reporter assay, and defined in vivo phenotype in knockout mouse with functional immune readout","pmids":["30877171"],"is_preprint":false},{"year":2019,"finding":"SOXE proteins (SOX8, SOX9, SOX10) share a bipartite transactivation mechanism: a transactivation domain in the middle of the protein (TAM) with amphipathic α-helices synergizes with a C-terminal domain (TAC); TAM contains a conserved EΦ[D/E]QYΦ motif required for function.","method":"Mutagenesis, transactivation reporter assays, structural prediction, evolutionary sequence analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of defined motif with functional reporter assay validation, multiple SOXE members tested, single lab","pmids":["31194875"],"is_preprint":false},{"year":2018,"finding":"SOX8 and SF1 cooperate to regulate Gja1/Cx43 expression in Sertoli cells; cJUN cooperates with SOX8 or SOX9 via the -47 bp AP-1 element of the Gja1 promoter to drive Cx43 expression.","method":"Co-transfection/luciferase reporter assays with Gja1 promoter constructs, in Sertoli cell lines","journal":"Molecular reproduction and development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter-reporter and co-transfection assays identifying functional element, single lab","pmids":["30080944"],"is_preprint":false},{"year":2020,"finding":"SOX8 and SF-1 cooperate to activate Cx43/connexin43 expression in Sertoli cells; SF-1 is recruited to the proximal -132 to -26 bp region of the Cx43 promoter as confirmed by ChIP.","method":"Co-transfection luciferase reporter assays, chromatin immunoprecipitation","journal":"Biochemistry and biophysics reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter assay confirming direct promoter recruitment, single lab","pmids":["33088929"],"is_preprint":false},{"year":2021,"finding":"Sox8 is a direct transcriptional target of Nfia in neural stem/precursor cells; Sox8 promotes LIF-induced astrocytic differentiation by associating with STAT3 through transcriptional coactivator p300, without inducing DNA demethylation of Gfap.","method":"ChIP for Nfia binding at Sox8 locus, Sox8 knockdown/overexpression, co-immunoprecipitation of Sox8-p300-STAT3, reporter assay","journal":"Pharmacology research & perspectives","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus co-IP plus functional differentiation assay, single lab with multiple methods","pmids":["34677001"],"is_preprint":false},{"year":2009,"finding":"Sox8 and Sox9 are required for Müller glial cell development in mouse retina; both genes are regulated by Notch signaling, which controls their transcription as shown using activated Notch and gamma-secretase inhibitor DAPT.","method":"shRNA knockdown, activated Notch overexpression, gamma-secretase inhibitor treatment, retinal cell proportion analysis","journal":"Experimental eye research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — shRNA loss-of-function and pharmacological manipulation with defined cell-type phenotype, single lab","pmids":["19490914"],"is_preprint":false},{"year":2012,"finding":"Sox9 and Sox8 jointly maintain basal lamina integrity of testis cords by controlling expression of collagen IV, collagen IXa3, testatin, and Scleraxis; combined loss leads to delamination of Sertoli cells and progressive FOXL2 upregulation indicating transdifferentiation.","method":"Conditional double-knockout mouse genetics, lineage tracing, immunostaining for structural/molecular markers","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 / Strong — compound conditional knockout with mechanistic molecular markers (collagen IV, scleraxis, FOXL2) and lineage tracing","pmids":["22837482"],"is_preprint":false},{"year":2020,"finding":"Genetic ablation of Sox8 and Sox9 together, but not either alone, prevents ovarian-to-testicular reprogramming in XX Rspo1-null mice, demonstrating that Sox8 alone can compensate for Sox9 loss in driving Sertoli cell differentiation during female-to-male sex reversal.","method":"Triple mutant mouse genetics (Rspo1-/- Sox8-/- Sox9 compound mutants), gonad morphology and marker analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — triple-mutant epistasis with defined cellular fate readout, rigorous genetic design","pmids":["32450947"],"is_preprint":false},{"year":2017,"finding":"In mouse spermatogonial cells, lncRNA Mrhl binds the Sox8 promoter along with Myc-Max-Mad transcription factors, corepressor Sin3a, and coactivator Pcaf to regulate Sox8 transcription; upon Wnt signaling activation and Mrhl downregulation, Sox8 directly regulates expression of premeiotic and meiotic markers.","method":"Chromatin immunoprecipitation, RNA-protein interaction assays, promoter reporter assays, Sox8 knockdown/overexpression","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and functional reporter assays identifying direct binding at Sox8 promoter, single lab","pmids":["28461394"],"is_preprint":false},{"year":2022,"finding":"lncRNA Mrhl regulates Sox8 in spermatogonia via CTCF/cohesin-mediated chromatin looping that brings the Sox8 promoter in contact with a silencer element when Mrhl is present; Mrhl interacts with the Sox8 locus through DNA:DNA:RNA triplex formation recruiting PRC2; upon Mrhl downregulation, a promoter-enhancer loop mediated by YY1 activates Sox8 transcription.","method":"Chromatin conformation capture (3C/loop assays), triplex formation assay, PRC2 ChIP, YY1 ChIP","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple chromatin architecture methods plus ChIP, single lab","pmids":["35412350"],"is_preprint":false},{"year":2022,"finding":"Sox8 is placed at the top of the ear determination network in cranial ectoderm; introducing Sox8 into non-ear cranial ectoderm converts cells to ear progenitors and activates programs for ear morphogenesis and neurogenesis, as established by gain-of-function and multiomics approaches.","method":"Loss-of-function experiments, Sox8 gain-of-function in cranial ectoderm, multiomics (ATAC-seq/RNA-seq)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — gain-of-function cell fate conversion plus loss-of-function with multiomics validation, single rigorous study","pmids":["35867760"],"is_preprint":false},{"year":2024,"finding":"SOX8 and SOX9 jointly promote commitment of growth plate reserve chondrocytes to columnar proliferating cells; compound Sox8/Sox9 inactivation in limb skeletal cells causes 15-20% shortening of long bones; SOX8 overexpression is more efficient than SOX9 at promoting chondrocyte proliferation and differentiation, possibly due to greater protein stability.","method":"Conditional single and compound knockout mouse genetics, SOX8/SOX9 overexpression in chondrocytes, growth plate histomorphometry, high-throughput gene expression assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — compound conditional knockout plus reciprocal overexpression in same system, quantitative growth phenotype, multiple methods","pmids":["38346197"],"is_preprint":false},{"year":2023,"finding":"Sox8 is essential for oligodendrocyte precursor cell proliferation and timely remyelination; Sox8-/- mice in the cuprizone model show reduced OPC proliferation at peak demyelination and fewer mature oligodendrocytes during remyelination, with delayed myelin marker recovery.","method":"Sox8 knockout mouse in cuprizone demyelination model, immunohistochemistry for oligodendroglial/myelin markers, motor performance testing","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — disease model with defined cellular and molecular phenotype in knockout, single lab","pmids":["38097655"],"is_preprint":false},{"year":2022,"finding":"SOX8 transcriptionally regulates EZH2 in pancreatic cancer, which then reduces SPARC expression via histone methylation, thereby reducing albumin-bound paclitaxel transport and conferring chemoresistance.","method":"ChIP, reporter assays, EZH2 inhibitor rescue, Western blot","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assay for direct SOX8-EZH2 promoter regulation with pharmacological rescue, single lab","pmids":["35173526"],"is_preprint":false},{"year":2022,"finding":"SOX8 binds directly to the HGF promoter and transcriptionally activates HGF expression, which activates the HGF/MET bypass pathway to induce cetuximab resistance in colorectal cancer cells.","method":"Chromatin immunoprecipitation, promoter-luciferase reporter assay","journal":"Cancer chemotherapy and pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assay confirming direct promoter binding, single lab","pmids":["35195773"],"is_preprint":false},{"year":2023,"finding":"SOX8 directly binds the FZD6 promoter and transcriptionally activates FZD6-dependent Wnt/β-catenin signaling to promote tumor growth in colorectal carcinoma; SOX8 knockdown reduces phospho-GSK3β and FZD6, rescued by FZD6 restoration.","method":"Luciferase reporter assay, knockdown/rescue experiment, Western blot","journal":"Heliyon","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — reporter assay plus functional rescue, single lab","pmids":["38046159"],"is_preprint":false},{"year":2025,"finding":"EHMT1 upregulates SOX8 expression via regulation of BRD4 expression, leading to increased BRD4 occupancy at the SOX8 promoter; SOX8 in turn regulates integrin gene expression to promote migration and invasion in embryonal rhabdomyosarcoma.","method":"ChIP for BRD4 at SOX8 promoter, EHMT1/SOX8 knockdown, RNA-seq, in vitro migration/invasion and in vivo metastasis assays","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus RNA-seq plus in vivo metastasis assays, single lab","pmids":["40467997"],"is_preprint":false},{"year":2025,"finding":"TRIM25 is an E3 ubiquitin ligase that interacts with SOX8 (by co-immunoprecipitation) and promotes its ubiquitination and proteasomal degradation; reduced SOX8 levels promote osteogenic differentiation of ligament fibroblasts, and SOX8 inhibits this process partly by transcriptionally activating OSR2.","method":"Co-immunoprecipitation, ubiquitination assay, mass spectrometry, dual-luciferase reporter assay, in vitro and in vivo osteogenic differentiation models","journal":"JOR spine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, ubiquitination assay, and reporter assay identifying writer and downstream target, single lab","pmids":["40918640"],"is_preprint":false},{"year":2025,"finding":"In Xenopus, Sox8 directly binds the kremen2 (Wnt inhibitor) promoter (confirmed by ChIP) and transcriptionally activates kremen2 expression; Sox8 depletion via CRISPR leads to blastopore closure defects, impaired AP axis elongation, abnormal ventral expansion of wnt11b, increased nuclear β-catenin, and reduced BMP signaling, establishing Sox8 as a regulator of Wnt signaling during gastrulation.","method":"CRISPR-DiCas7-11 depletion, ChIP, transcriptomic analysis, in situ hybridization, β-catenin localization","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — CRISPR loss-of-function plus direct ChIP binding evidence plus transcriptomic validation, single rigorous study","pmids":["41214364"],"is_preprint":false},{"year":2018,"finding":"In the chicken otic placode, Sox8 binds the Otic1 enhancer of the Sox3 gene (confirmed by ChIP-qPCR) and cooperates with Sall4 to activate Sox3 transcription, establishing a direct transcriptional regulatory interaction in otic placode specification.","method":"ChIP-qPCR, luciferase reporter assays, enhancer dissection","journal":"Development, growth & differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirmation of direct binding plus functional reporter assay, single lab","pmids":["29520762"],"is_preprint":false},{"year":2024,"finding":"In adult oligodendrocytes, Sox8 deletion alone does not alter oligodendrocyte numbers or myelin structure, but combined Sox8/Sox10 deletion causes substantially greater alterations in oligodendrocyte expression profiles than Sox10 deletion alone; the differential transcriptional activity of Sox8 vs Sox10 depends on the N-terminal one-third of the protein, not the known C-terminal transactivation domains.","method":"Targeted Sox8/Sox10 deletion in adult mouse brains, RNA-sequencing of corpus callosum, protein domain swap experiments in oligodendroglial cell line","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — conditional knockout plus RNA-seq plus domain mapping in cell line, single lab","pmids":["39201442"],"is_preprint":false},{"year":2024,"finding":"Molecular analysis in the oligodendroglial Oln93 cell line shows that Sox8 regulates the same gene targets as Sox10 but with substantially lower transcriptional activity despite comparable binding to regulatory regions; the differential activity maps to the N-terminal one-third of the Sox protein, not the C-terminal transactivation domains.","method":"Gene replacement in oligodendroglial cell line, transcriptomic profiling (RNA-seq), chromatin binding comparison","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — cell line replacement experiment with genome-wide expression and binding analysis, single lab","pmids":["39769160"],"is_preprint":false},{"year":2021,"finding":"hnRNPU interacts with SOX9 and enhances Sox8 and Sox9 expression in Sertoli cells by directly binding to their promoter regions; hnRNPU conditional knockout in Sertoli cells causes testicular atrophy, depletion of Sertoli and germ cells, and male sterility.","method":"Co-immunoprecipitation, ChIP-qPCR, luciferase assay, conditional knockout mouse, RNA-seq","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and co-IP plus conditional KO phenotype, single lab","pmids":["34815802"],"is_preprint":false}],"current_model":"SOX8 is a SOXE-group HMG-box transcription factor that binds canonical SOX DNA sequences and activates transcription through a bipartite mechanism (central TAM and C-terminal TAC domains); it acts largely redundantly with SOX9 and SOX10 across multiple developmental contexts (testis, oligodendrocytes, neural crest, chondrocytes), reinforcing SOX9 function in Sertoli cell identity and adult testis maintenance (including blood-testis barrier integrity via direct claudin-3 regulation), promoting terminal oligodendrocyte differentiation and remyelination, specifying M cells by directly activating Gp2 transcription, and inhibiting myoblast and osteoblast differentiation via Runx2 suppression; SOX8 activity is post-translationally regulated by Aurora-A-mediated phosphorylation at Ser327 and by TRIM25-mediated ubiquitination/degradation, and its transcription is controlled at the chromatin level by lncRNA Mrhl through CTCF/cohesin looping and PRC2 recruitment."},"narrative":{"mechanistic_narrative":"SOX8 is a SOXE-group HMG-box transcription factor that binds canonical SOX DNA elements and activates transcription through a bipartite mechanism, in which a central transactivation domain (TAM) bearing a conserved EΦ[D/E]QYΦ motif and amphipathic α-helices synergizes with a C-terminal domain (TAC) [PMID:10684944, PMID:31194875]. Across diverse developmental settings it acts largely redundantly with the related SOXE factors SOX9 and SOX10, typically as a weaker partner, and can form DNA-dependent heterodimers with SOX10 on shared response elements [PMID:15102707, PMID:15893981, PMID:16790476]. In the testis, SOX8 reinforces SOX9 to establish and maintain Sertoli cell identity: combined loss produces defects more severe than SOX9 loss alone, the two factors sustain Dmrt1 and basal lamina integrity, and their joint ablation drives Sertoli-to-granulosa transdifferentiation and testis-to-ovary reprogramming [PMID:15056615, PMID:27328324, PMID:22837482, PMID:32450947]. SOX8 maintains adult spermatogenesis and blood-testis barrier integrity through direct activation of the claudin-3 promoter [PMID:18342849, PMID:23595903]. In the CNS, SOX8 promotes oligodendrocyte differentiation and remyelination redundantly with SOX10, regulating overlapping targets but with intrinsically lower transcriptional output that maps to the N-terminal third of the protein rather than the C-terminal transactivation domains [PMID:15893981, PMID:38097655, PMID:39201442, PMID:39769160]. SOX8 also acts as a fate-determining factor at the top of the ear-determination network and specifies intestinal M cells by directly activating Gp2 downstream of RANKL-RelB signaling [PMID:30877171, PMID:35867760], and it directly regulates Wnt-pathway components during vertebrate gastrulation [PMID:41214364]. It negatively regulates myoblast and osteoblast differentiation, in the latter case by suppressing Runx2 [PMID:15753123, PMID:12782625], while promoting growth-plate chondrocyte commitment together with SOX9 [PMID:38346197]. SOX8 activity is post-translationally controlled by Aurora-A-mediated phosphorylation at Ser327 and by TRIM25-mediated ubiquitination and proteasomal degradation, and its transcription is set at the chromatin level by lncRNA Mrhl through CTCF/cohesin looping and PRC2 recruitment [PMID:32550913, PMID:35412350, PMID:40918640]. In cancers, SOX8 acts as an oncogenic transcription factor that confers therapy resistance through direct activation of Wnt receptors and bypass-signaling genes [PMID:29071717, PMID:35195773, PMID:38046159].","teleology":[{"year":2000,"claim":"Established that SOX8 is a functional sequence-specific transactivator and defined where in the protein its activation capacity resides, distinguishing it from SOX9/SOX10.","evidence":"In vitro transcription/reporter assays with domain mapping","pmids":["10684944"],"confidence":"Medium","gaps":["No genomic target genes identified","Structural basis of the activation domains not resolved"]},{"year":2003,"claim":"Showed SOX8 engages a physiological target by binding the Amh promoter and synergizing with SF1, placing it in the Sertoli-cell sex-determination circuitry as a weaker SOX9-like activator.","evidence":"In vitro DNA binding, luciferase reporter, and co-IP for SOX8–SF1 interaction","pmids":["12732652"],"confidence":"High","gaps":["In vitro only; in vivo relevance to Amh not tested","Relative contribution vs SOX9 not quantified"]},{"year":2003,"claim":"Revealed a non-developmental-glial role: SOX8 antagonizes myogenic differentiation by interfering with bHLH factors, showing it can act as a transcriptional repressor of lineage programs.","evidence":"Myoblast overexpression, myogenin promoter reporter, RT-PCR/Western","pmids":["12782625"],"confidence":"Medium","gaps":["Direct DNA binding at myogenic loci not shown","Mechanism of bHLH interference unresolved"]},{"year":2004,"claim":"Defined functional redundancy with SOX9 in Sertoli cell differentiation, establishing the SOXE redundancy paradigm in the testis.","evidence":"Sox8/Sox9 double-knockout mouse epistasis","pmids":["15056615"],"confidence":"High","gaps":["Direct shared target genes not defined here","Molecular basis of synergy not resolved"]},{"year":2004,"claim":"Demonstrated SOX8 forms DNA-dependent heterodimers with SOX10 and acts redundantly in oligodendrocyte differentiation, explaining its weaker contribution as a function of lower expression.","evidence":"EMSA, heterodimerization and reporter assays, Sox8-deficient mouse","pmids":["15102707"],"confidence":"High","gaps":["Whether weakness is purely expression-level or intrinsic not settled here","Genome-wide co-occupancy not mapped"]},{"year":2005,"claim":"Extended the redundancy model across SOXE factors in oligodendrocyte development and to neural crest survival, showing SOX8 functions as a dose-sensitive modifier of SOX10.","evidence":"Sox8/Sox9 double-KO spinal cord and Sox8/Sox10 compound-mutant ENS genetics with apoptosis assays","pmids":["15893981","15572147"],"confidence":"High","gaps":["Direct targets controlling progenitor survival not identified","Tissue-specific quantitative dose relationships not fully defined"]},{"year":2005,"claim":"Identified SOX8 as a negative regulator of osteoblast differentiation acting through Runx2 suppression, broadening its role to skeletal lineage restraint.","evidence":"Reciprocal Sox8 knockout and Col1a1-transgenic mouse models, bone histomorphometry, Runx2 qRT-PCR","pmids":["15753123"],"confidence":"High","gaps":["Whether Runx2 regulation is direct not shown","Mechanism of repression undefined"]},{"year":2006,"claim":"Quantified the limits of SOXE interchangeability by replacing Sox10 with Sox8 in vivo, showing lineage-specific incomplete equivalence (e.g., failure to rescue melanocytes).","evidence":"Sox8-into-Sox10 knock-in mouse, multi-lineage histology","pmids":["16790476"],"confidence":"High","gaps":["Molecular determinants of lineage-specific failure not mapped here","Distinct from later N-terminal domain mapping"]},{"year":2006,"claim":"Assigned SOX8 a role in neural crest induction timing and migration in a vertebrate embryo model.","evidence":"Morpholino knockdown in Xenopus, in situ hybridization, lineage tracing","pmids":["16943273"],"confidence":"Medium","gaps":["Direct migration-controlling targets not identified","Morpholino specificity not independently confirmed"]},{"year":2008,"claim":"Established SOX8 as a critical regulator of adult Sertoli cell function and ongoing spermatogenesis, beyond embryonic differentiation.","evidence":"Sox8-null mouse histology and protein localization","pmids":["18342849"],"confidence":"High","gaps":["Direct adult target genes not defined here","Age-dependence mechanism unresolved"]},{"year":2009,"claim":"Broadened SOX8 function to precursor maintenance in adipose tissue and to retinal Muller glia development under Notch control, indicating roles in progenitor pools across tissues.","evidence":"Sox8-KO mouse adipose analysis with in vitro rescue; retinal shRNA plus Notch/DAPT manipulation","pmids":["19286648","19490914"],"confidence":"Medium","gaps":["Direct adipocyte/Muller-glia target genes not identified","Notch→Sox8 link is regulatory, not shown to be direct"]},{"year":2012,"claim":"Showed SOX9/SOX8 maintain testis cord basal lamina integrity through structural-gene programs, with loss triggering Sertoli transdifferentiation marked by FOXL2 upregulation.","evidence":"Conditional double-KO mouse, lineage tracing, marker immunostaining","pmids":["22837482"],"confidence":"High","gaps":["Direct binding to collagen/scleraxis loci not demonstrated","Trigger of transdifferentiation not mechanistically resolved"]},{"year":2013,"claim":"Provided the first direct genomic target in the testis by demonstrating SOX8 binds and activates the claudin-3 promoter to maintain the blood-testis barrier.","evidence":"ChIP, Western, biotin tracer permeability assay, electron microscopy in Sox8-deficient mice","pmids":["23595903"],"confidence":"High","gaps":["Other barrier targets not surveyed","Microtubule destabilization mechanism indirect"]},{"year":2016,"claim":"Placed SOX9/SOX8 above Dmrt1 in maintaining adult testicular identity, showing their combined loss reprograms the gonad toward the ovarian fate.","evidence":"Conditional Sox9 ablation on Sox8-null background, lineage-marker immunostaining","pmids":["27328324"],"confidence":"High","gaps":["Direct vs indirect Dmrt1 regulation not resolved","SOX8-only contribution not isolated"]},{"year":2017,"claim":"Defined the chromatin-level control of Sox8 transcription by lncRNA Mrhl in spermatogonia and tied Sox8 output to Wnt signaling, and separately revealed an oncogenic Wnt-receptor target program.","evidence":"ChIP, RNA-protein interaction and reporter assays at the Sox8 promoter; ChIP/reporter for SOX8→FZD7 in tongue carcinoma","pmids":["28461394","29071717"],"confidence":"Medium","gaps":["Mrhl mechanism not yet resolved to chromatin architecture (addressed later)","FZD7 study single-lab without in vivo validation"]},{"year":2018,"claim":"Identified cooperating partners and direct cis-elements: SOX8 cooperates with SF1/cJUN at the Gja1/Cx43 promoter in Sertoli cells and with Sall4 at the Sox3 otic enhancer in placode specification.","evidence":"Co-transfection/reporter assays at Gja1; ChIP-qPCR and reporter at the Sox3 Otic1 enhancer","pmids":["30080944","29520762"],"confidence":"Medium","gaps":["In vivo requirement of these elements not tested","Single-lab reporter-based evidence"]},{"year":2019,"claim":"Established SOX8 as the direct transcriptional driver of intestinal M cell identity via the Gp2 promoter downstream of RANKL-RelB, and refined the SOXE bipartite transactivation model with a conserved TAM motif.","evidence":"Sox8-KO mouse with ChIP/reporter at Gp2 and immune readouts; mutagenesis/reporter mapping of TAM/TAC across SOXE proteins","pmids":["30877171","31194875"],"confidence":"High","gaps":["Cofactors at the Gp2 promoter not fully defined","Structural model of TAM-TAC synergy not solved"]},{"year":2020,"claim":"Revealed post-translational and upstream control of SOX8: Aurora-A phosphorylates Ser327 to drive a senescence/glycolysis program and chemoresistance, and confirmed SF1 recruitment to the Cx43 promoter.","evidence":"IP/MS/FRET-FLIM, in vitro phosphorylation, ChIP/reporter in ovarian cancer; ChIP/reporter for SF1 at Cx43","pmids":["32550913","33088929"],"confidence":"High","gaps":["Whether Ser327 phosphorylation operates in normal development not tested","Structural consequence of phosphorylation unknown"]},{"year":2020,"claim":"Demonstrated SOX8 alone can compensate for SOX9 loss in driving Sertoli differentiation, sharpening the functional-equivalence picture during sex reversal.","evidence":"Rspo1/Sox8/Sox9 compound-mutant mouse genetics with gonad marker analysis","pmids":["32450947"],"confidence":"High","gaps":["Threshold of SOX8 sufficiency not quantified","Direct targets mediating compensation not identified"]},{"year":2021,"claim":"Connected SOX8 to upstream regulators and a cofactor in neural/Sertoli contexts: NFIA directly activates Sox8 and SOX8 partners with STAT3/p300 in astrocytic differentiation, while hnRNPU enhances Sox8/Sox9 expression in Sertoli cells.","evidence":"ChIP, co-IP, reporter and differentiation assays; Sertoli conditional hnRNPU-KO with ChIP/co-IP","pmids":["34677001","34815802"],"confidence":"Medium","gaps":["Direct astrocytic SOX8 targets not mapped","hnRNPU effect on Sox8 vs Sox9 not separable"]},{"year":2022,"claim":"Resolved the chromatin architecture by which Mrhl gates Sox8 (CTCF/cohesin silencer loop and PRC2 recruitment versus YY1 enhancer loop), and expanded oncogenic SOX8 mechanisms to EZH2/SPARC and HGF/MET resistance pathways.","evidence":"3C/loop assays, triplex assay, PRC2/YY1 ChIP at Sox8 locus; ChIP/reporter for SOX8→EZH2 and SOX8→HGF in cancer","pmids":["35412350","35173526","35195773"],"confidence":"Medium","gaps":["Cancer mechanisms each single-lab","In vivo relevance of the Mrhl architecture beyond spermatogonia untested"]},{"year":2022,"claim":"Positioned SOX8 at the top of the ear-determination hierarchy, showing it is a fate-instructive master factor capable of converting cranial ectoderm to ear progenitors.","evidence":"Gain- and loss-of-function in cranial ectoderm with ATAC-seq/RNA-seq","pmids":["35867760"],"confidence":"High","gaps":["Direct pioneer activity on chromatin not formally demonstrated","Downstream direct targets not individually validated"]},{"year":2023,"claim":"Defined SOX8 requirement for OPC proliferation and timely remyelination in a demyelination model, and added an oncogenic FZD6/Wnt target axis.","evidence":"Sox8-KO cuprizone model with myelin marker IHC; reporter/knockdown-rescue for SOX8→FZD6 in colorectal carcinoma","pmids":["38097655","38046159"],"confidence":"Medium","gaps":["Direct OPC-proliferation targets not identified","FZD6 study lacks direct ChIP/in vivo confirmation"]},{"year":2024,"claim":"Showed SOX8/SOX9 jointly drive growth-plate chondrocyte commitment and that SOX8's intrinsically distinct (and in oligodendrocytes weaker) transcriptional activity maps to its N-terminal third, not the C-terminal transactivation domains.","evidence":"Compound conditional KO and reciprocal overexpression in chondrocytes; adult Sox8/Sox10 KO RNA-seq and domain-swap experiments in oligodendroglial cells","pmids":["38346197","39201442","39769160"],"confidence":"Medium","gaps":["Molecular basis of N-terminal activity difference not resolved","Whether protein-stability difference fully explains chondrocyte potency untested"]},{"year":2025,"claim":"Established TRIM25 as an E3 ligase degrading SOX8, identified OSR2 and integrin programs as downstream effectors, and showed SOX8 directly regulates kremen2 to modulate Wnt during gastrulation.","evidence":"Co-IP/ubiquitination/reporter (TRIM25, OSR2) in ligament fibroblasts; ChIP/RNA-seq (EHMT1→BRD4→SOX8→integrin) in rhabdomyosarcoma; CRISPR/ChIP/transcriptomics for Sox8→kremen2 in Xenopus","pmids":["40918640","40467997","41214364"],"confidence":"Medium","gaps":["TRIM25 and EHMT1 axes each single-lab","Integration of degradation control with developmental SOX8 dosage untested"]},{"year":null,"claim":"It remains unresolved how SOX8's intrinsic transcriptional weakness, partner selectivity, and post-translational regulation are integrated to determine context-specific outputs across redundancy with SOX9/SOX10.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of the TAM/TAC transactivation surface or N-terminal activity-modulating region","Genome-wide SOX8 vs SOX9/SOX10 occupancy maps across tissues incomplete","Whether Aurora-A/TRIM25 regulation operates in developmental contexts unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,3,12,16,17,34]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,3,12,16,34,35]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[12,14,16]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,12,16,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,5,9,26,27]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[2,10,13,22,23]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[15,31,34]}],"complexes":[],"partners":["SOX9","SOX10","SF1","AURORA-A","TRIM25","STAT3","EP300","HNRNPU"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P57073","full_name":"Transcription factor SOX-8","aliases":[],"length_aa":446,"mass_kda":47.3,"function":"Transcription factor that may play a role in central nervous system, limb and facial development. May be involved in male sex determination. Binds the consensus motif 5'-[AT][AT]CAA[AT]G-3' (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P57073/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SOX8","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SOX8","total_profiled":1310},"omim":[{"mim_id":"608160","title":"SRY-BOX 9; SOX9","url":"https://www.omim.org/entry/608160"},{"mim_id":"605923","title":"SRY-BOX 8; SOX8","url":"https://www.omim.org/entry/605923"},{"mim_id":"141750","title":"ALPHA-THALASSEMIA/IMPAIRED INTELLECTUAL DEVELOPMENT SYNDROME, DELETION TYPE","url":"https://www.omim.org/entry/141750"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":92.6}],"url":"https://www.proteinatlas.org/search/SOX8"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P57073","domains":[{"cath_id":"1.10.30.10","chopping":"65-87_104-166","consensus_level":"high","plddt":86.5267,"start":65,"end":166}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P57073","model_url":"https://alphafold.ebi.ac.uk/files/AF-P57073-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P57073-F1-predicted_aligned_error_v6.png","plddt_mean":58.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SOX8","jax_strain_url":"https://www.jax.org/strain/search?query=SOX8"},"sequence":{"accession":"P57073","fasta_url":"https://rest.uniprot.org/uniprotkb/P57073.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P57073/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P57073"}},"corpus_meta":[{"pmid":"15056615","id":"PMC_15056615","title":"Functional analysis of Sox8 and Sox9 during sex determination in the mouse.","date":"2004","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/15056615","citation_count":450,"is_preprint":false},{"pmid":"15102707","id":"PMC_15102707","title":"Transcription factors Sox8 and Sox10 perform non-equivalent roles during oligodendrocyte development despite functional redundancy.","date":"2004","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/15102707","citation_count":175,"is_preprint":false},{"pmid":"15572147","id":"PMC_15572147","title":"Identification of Sox8 as a modifier gene in a mouse model of Hirschsprung disease reveals underlying molecular defect.","date":"2005","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/15572147","citation_count":144,"is_preprint":false},{"pmid":"11564878","id":"PMC_11564878","title":"Idiopathic weight reduction in mice deficient in the high-mobility-group transcription factor Sox8.","date":"2001","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/11564878","citation_count":143,"is_preprint":false},{"pmid":"32550913","id":"PMC_32550913","title":"Aurora-A/SOX8/FOXK1 signaling axis promotes chemoresistance via suppression of cell senescence and induction of glucose metabolism in ovarian cancer organoids and cells.","date":"2020","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/32550913","citation_count":132,"is_preprint":false},{"pmid":"12732652","id":"PMC_12732652","title":"SOX8 is expressed during testis differentiation in mice and synergizes with SF1 to activate the Amh promoter in vitro.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12732652","citation_count":128,"is_preprint":false},{"pmid":"19647095","id":"PMC_19647095","title":"SOX E genes: SOX9 and SOX8 in mammalian testis development.","date":"2009","source":"The international journal of biochemistry & cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/19647095","citation_count":120,"is_preprint":false},{"pmid":"29071717","id":"PMC_29071717","title":"SOX8 regulates cancer stem-like properties and cisplatin-induced EMT in tongue squamous cell carcinoma by acting on the Wnt/β-catenin pathway.","date":"2017","source":"International journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/29071717","citation_count":115,"is_preprint":false},{"pmid":"18512230","id":"PMC_18512230","title":"Quantitative assessment of glial cells in the human and guinea pig enteric nervous system with an anti-Sox8/9/10 antibody.","date":"2008","source":"The Journal of comparative neurology","url":"https://pubmed.ncbi.nlm.nih.gov/18512230","citation_count":104,"is_preprint":false},{"pmid":"18342849","id":"PMC_18342849","title":"Sox8 is a critical regulator of adult Sertoli cell function and male fertility.","date":"2008","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/18342849","citation_count":89,"is_preprint":false},{"pmid":"16943273","id":"PMC_16943273","title":"Functional analysis of Sox8 during neural crest development in Xenopus.","date":"2006","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/16943273","citation_count":89,"is_preprint":false},{"pmid":"15893981","id":"PMC_15893981","title":"Impact of transcription factor Sox8 on oligodendrocyte specification in the mouse embryonic spinal cord.","date":"2005","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/15893981","citation_count":86,"is_preprint":false},{"pmid":"27328324","id":"PMC_27328324","title":"Sox9 and Sox8 protect the adult testis from male-to-female genetic reprogramming and complete degeneration.","date":"2016","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/27328324","citation_count":83,"is_preprint":false},{"pmid":"12782625","id":"PMC_12782625","title":"Sox8 is a specific marker for muscle satellite cells and inhibits myogenesis.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12782625","citation_count":82,"is_preprint":false},{"pmid":"16790476","id":"PMC_16790476","title":"Replacement of the Sox10 transcription factor by Sox8 reveals incomplete functional equivalence.","date":"2006","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/16790476","citation_count":81,"is_preprint":false},{"pmid":"10684944","id":"PMC_10684944","title":"Cloning and characterisation of the Sry-related transcription factor gene Sox8.","date":"2000","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/10684944","citation_count":76,"is_preprint":false},{"pmid":"15753123","id":"PMC_15753123","title":"The high mobility group transcription factor Sox8 is a negative regulator of osteoblast differentiation.","date":"2005","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/15753123","citation_count":74,"is_preprint":false},{"pmid":"19490914","id":"PMC_19490914","title":"The group E Sox genes Sox8 and Sox9 are regulated by Notch signaling and are required for Müller glial cell development in mouse retina.","date":"2009","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/19490914","citation_count":68,"is_preprint":false},{"pmid":"30877171","id":"PMC_30877171","title":"Sox8 is essential for M cell maturation to accelerate IgA response at the early stage after weaning in mice.","date":"2019","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/30877171","citation_count":52,"is_preprint":false},{"pmid":"29373757","id":"PMC_29373757","title":"Mutations involving the SRY-related gene SOX8 are associated with a spectrum of human reproductive anomalies.","date":"2018","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29373757","citation_count":51,"is_preprint":false},{"pmid":"10662550","id":"PMC_10662550","title":"The SOX8 gene is located within 700 kb of the tip of chromosome 16p and is deleted in a patient with ATR-16 syndrome.","date":"2000","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/10662550","citation_count":50,"is_preprint":false},{"pmid":"31194875","id":"PMC_31194875","title":"The SOXE transcription factors-SOX8, SOX9 and SOX10-share a bi-partite transactivation mechanism.","date":"2019","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/31194875","citation_count":48,"is_preprint":false},{"pmid":"12351187","id":"PMC_12351187","title":"Expression of Sox8, Sox9 and Sox10 in the developing valves and autonomic nerves of the embryonic heart.","date":"2002","source":"Mechanisms of development","url":"https://pubmed.ncbi.nlm.nih.gov/12351187","citation_count":46,"is_preprint":false},{"pmid":"28461394","id":"PMC_28461394","title":"Mrhl Long Noncoding RNA Mediates Meiotic Commitment of Mouse Spermatogonial Cells by Regulating Sox8 Expression.","date":"2017","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/28461394","citation_count":45,"is_preprint":false},{"pmid":"10842083","id":"PMC_10842083","title":"SOX8 expression during chick embryogenesis.","date":"2000","source":"Mechanisms of development","url":"https://pubmed.ncbi.nlm.nih.gov/10842083","citation_count":39,"is_preprint":false},{"pmid":"22837482","id":"PMC_22837482","title":"Sox9 and Sox8 are required for basal lamina integrity of testis cords and for suppression of FOXL2 during embryonic testis development in mice.","date":"2012","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/22837482","citation_count":38,"is_preprint":false},{"pmid":"34815802","id":"PMC_34815802","title":"hnRNPU in Sertoli cells cooperates with WT1 and is essential for testicular development by modulating transcriptional factors Sox8/9.","date":"2021","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/34815802","citation_count":35,"is_preprint":false},{"pmid":"24643625","id":"PMC_24643625","title":"Oncogenicity of the transcription factor SOX8 in hepatocellular carcinoma.","date":"2014","source":"Medical oncology (Northwood, London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/24643625","citation_count":34,"is_preprint":false},{"pmid":"15625693","id":"PMC_15625693","title":"Expression of Sox8, Sf1, Gata4, Wt1, Dax1, and Fog2 in the mouse ovarian follicle: implications for the regulation of Amh expression.","date":"2005","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/15625693","citation_count":29,"is_preprint":false},{"pmid":"32767319","id":"PMC_32767319","title":"Low expression of CircRNA HIPK3 promotes osteoarthritis chondrocyte apoptosis by serving as a sponge of miR-124 to regulate SOX8.","date":"2020","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/32767319","citation_count":29,"is_preprint":false},{"pmid":"38142583","id":"PMC_38142583","title":"Excessive SOX8 reprograms energy and iron metabolism to prime hepatocellular carcinoma for ferroptosis.","date":"2023","source":"Redox biology","url":"https://pubmed.ncbi.nlm.nih.gov/38142583","citation_count":27,"is_preprint":false},{"pmid":"23595903","id":"PMC_23595903","title":"SOX8 regulates permeability of the blood-testes barrier that affects adult male fertility in the mouse.","date":"2013","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/23595903","citation_count":26,"is_preprint":false},{"pmid":"32450947","id":"PMC_32450947","title":"Sox8 and Sox9 act redundantly for ovarian-to-testicular fate reprogramming in the absence of R-spondin1 in mouse sex reversals.","date":"2020","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/32450947","citation_count":22,"is_preprint":false},{"pmid":"34677001","id":"PMC_34677001","title":"SoxE group transcription factor Sox8 promotes astrocytic differentiation of neural stem/precursor cells downstream of Nfia.","date":"2021","source":"Pharmacology research & perspectives","url":"https://pubmed.ncbi.nlm.nih.gov/34677001","citation_count":22,"is_preprint":false},{"pmid":"24449344","id":"PMC_24449344","title":"Brief report: importance of SOX8 for in vitro chondrogenic differentiation of human mesenchymal stromal cells.","date":"2014","source":"Stem cells (Dayton, Ohio)","url":"https://pubmed.ncbi.nlm.nih.gov/24449344","citation_count":20,"is_preprint":false},{"pmid":"36918540","id":"PMC_36918540","title":"Downregulation of Sox8 mediates monosodium urate crystal-induced autophagic impairment of cartilage in gout arthritis.","date":"2023","source":"Cell death discovery","url":"https://pubmed.ncbi.nlm.nih.gov/36918540","citation_count":19,"is_preprint":false},{"pmid":"28472858","id":"PMC_28472858","title":"Selective neuronal expression of the SoxE factor, Sox8, in direct pathway striatal projection neurons of the developing mouse brain.","date":"2017","source":"The Journal of comparative neurology","url":"https://pubmed.ncbi.nlm.nih.gov/28472858","citation_count":19,"is_preprint":false},{"pmid":"15366016","id":"PMC_15366016","title":"Sox8 is expressed at similar levels in gonads of both sexes during the sex determining period in turtles.","date":"2004","source":"Developmental dynamics : an official publication of the American Association of Anatomists","url":"https://pubmed.ncbi.nlm.nih.gov/15366016","citation_count":19,"is_preprint":false},{"pmid":"25550787","id":"PMC_25550787","title":"miRNA-124 down-regulates SOX8 expression and suppresses cell proliferation in non-small cell lung cancer.","date":"2014","source":"International journal of clinical and experimental pathology","url":"https://pubmed.ncbi.nlm.nih.gov/25550787","citation_count":18,"is_preprint":false},{"pmid":"36373629","id":"PMC_36373629","title":"Promotive role of USP29-mediated deubiquitination in malignant proliferation of colorectal cancer cells via the KIAA1429/SOX8 axis.","date":"2023","source":"Biomolecules & biomedicine","url":"https://pubmed.ncbi.nlm.nih.gov/36373629","citation_count":18,"is_preprint":false},{"pmid":"30080944","id":"PMC_30080944","title":"Gja1 expression is regulated by cooperation between SOX8/SOX9 and cJUN transcription factors in TM4 and 15P-1 Sertoli cell lines.","date":"2018","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/30080944","citation_count":18,"is_preprint":false},{"pmid":"34533063","id":"PMC_34533063","title":"Notoginsenoside R2 reduces Aβ25-35-induced neuronal apoptosis and inflammation via miR-27a/SOX8/β-catenin axis.","date":"2021","source":"Human & experimental toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/34533063","citation_count":17,"is_preprint":false},{"pmid":"22580033","id":"PMC_22580033","title":"Homologues of sox8 and sox10 in the orange-spotted grouper Epinephelus coioides: sequences, expression patterns, and their effects on cyp19a1a promoter activities in vitro.","date":"2012","source":"Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/22580033","citation_count":16,"is_preprint":false},{"pmid":"38346197","id":"PMC_38346197","title":"Skeletal growth is enhanced by a shared role for SOX8 and SOX9 in promoting reserve chondrocyte commitment to columnar proliferation.","date":"2024","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/38346197","citation_count":15,"is_preprint":false},{"pmid":"19339814","id":"PMC_19339814","title":"Downstream genes of Sox8 that would affect adult male fertility.","date":"2009","source":"Sexual development : genetics, molecular biology, evolution, endocrinology, embryology, and pathology of sex determination and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/19339814","citation_count":15,"is_preprint":false},{"pmid":"32833900","id":"PMC_32833900","title":"Long Noncoding RNA Taurine-Upregulated Gene 1 Knockdown Protects Cardiomyocytes Against Hypoxia/Reoxygenation-induced Injury Through Regulating miR-532-5p/Sox8 Axis.","date":"2020","source":"Journal of cardiovascular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/32833900","citation_count":14,"is_preprint":false},{"pmid":"25400731","id":"PMC_25400731","title":"miRNA-124 down-regulates SOX8 expression and suppresses cell proliferation in non-small cell lung cancer.","date":"2014","source":"International journal of clinical and experimental pathology","url":"https://pubmed.ncbi.nlm.nih.gov/25400731","citation_count":13,"is_preprint":false},{"pmid":"35739923","id":"PMC_35739923","title":"Two Different Copy Number Variations of the SOX5 and SOX8 Genes in Yak and Their Association with Growth Traits.","date":"2022","source":"Animals : an open access journal from MDPI","url":"https://pubmed.ncbi.nlm.nih.gov/35739923","citation_count":13,"is_preprint":false},{"pmid":"35867760","id":"PMC_35867760","title":"Sox8 remodels the cranial ectoderm to generate the ear.","date":"2022","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/35867760","citation_count":12,"is_preprint":false},{"pmid":"30922563","id":"PMC_30922563","title":"Transcriptomic analysis of overexpressed SOX4 and SOX8 in TM4 Sertoli cells with emphasis on cell-to-cell interactions.","date":"2019","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/30922563","citation_count":12,"is_preprint":false},{"pmid":"33061629","id":"PMC_33061629","title":"MicroRNA-139 Suppresses the Tumorigenicity of Triple Negative Breast Cancer Cells by Targeting SOX8.","date":"2020","source":"Cancer management and research","url":"https://pubmed.ncbi.nlm.nih.gov/33061629","citation_count":12,"is_preprint":false},{"pmid":"21373258","id":"PMC_21373258","title":"A Case of Agonadism, Skeletal Malformations, Bicuspid Aortic Valve, and Delayed Development with a 16p13.3 Duplication Including GNG13 and SOX8 Upstream Enhancers: Are Either, Both or Neither Involved in the Phenotype?","date":"2010","source":"Molecular syndromology","url":"https://pubmed.ncbi.nlm.nih.gov/21373258","citation_count":12,"is_preprint":false},{"pmid":"38097655","id":"PMC_38097655","title":"Endogenous Sox8 is a critical factor for timely remyelination and oligodendroglial cell repletion in the cuprizone model.","date":"2023","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/38097655","citation_count":11,"is_preprint":false},{"pmid":"35173526","id":"PMC_35173526","title":"SOX8 Affects Tumoral SPARC Expression by Regulating EZH2 to Attenuate Effectiveness of albumin-bound paclitaxel in PDAC.","date":"2022","source":"International journal of biological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/35173526","citation_count":11,"is_preprint":false},{"pmid":"19286648","id":"PMC_19286648","title":"Adult-onset degeneration of adipose tissue in mice deficient for the Sox8 transcription factor.","date":"2009","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/19286648","citation_count":11,"is_preprint":false},{"pmid":"39950798","id":"PMC_39950798","title":"Identification of a Novel Substrate for eEF2K and the AURKA-SOX8 as the Related Pathway in TNBC.","date":"2025","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/39950798","citation_count":10,"is_preprint":false},{"pmid":"17905940","id":"PMC_17905940","title":"Sox8 and Sertoli-cell function.","date":"2007","source":"Annals of the New York Academy of Sciences","url":"https://pubmed.ncbi.nlm.nih.gov/17905940","citation_count":10,"is_preprint":false},{"pmid":"34373588","id":"PMC_34373588","title":"Activation of RSK2 upregulates SOX8 to promote methotrexate resistance in gestational trophoblastic neoplasia.","date":"2021","source":"Laboratory investigation; a journal of technical methods and pathology","url":"https://pubmed.ncbi.nlm.nih.gov/34373588","citation_count":10,"is_preprint":false},{"pmid":"23315995","id":"PMC_23315995","title":"Genome-wide identification of Sox8-, and Sox9-dependent genes during early post-natal testis development in the mouse.","date":"2013","source":"Andrology","url":"https://pubmed.ncbi.nlm.nih.gov/23315995","citation_count":10,"is_preprint":false},{"pmid":"14689607","id":"PMC_14689607","title":"Origin and possible roles of the Sox8 transcription factor gene during sexual development.","date":"2003","source":"Cytogenetic and genome research","url":"https://pubmed.ncbi.nlm.nih.gov/14689607","citation_count":9,"is_preprint":false},{"pmid":"36631813","id":"PMC_36631813","title":"Additional evidence for the role of chromosomal imbalances and SOX8, ZNRF3 and HHAT gene variants in early human testis development.","date":"2023","source":"Reproductive biology and endocrinology : RB&E","url":"https://pubmed.ncbi.nlm.nih.gov/36631813","citation_count":9,"is_preprint":false},{"pmid":"39936824","id":"PMC_39936824","title":"Sox8: a multifaceted transcription factor in development and disease.","date":"2025","source":"Biology open","url":"https://pubmed.ncbi.nlm.nih.gov/39936824","citation_count":8,"is_preprint":false},{"pmid":"35195773","id":"PMC_35195773","title":"SOX8 promotes cetuximab resistance via HGF/MET bypass pathway activation in colorectal cancer.","date":"2022","source":"Cancer chemotherapy and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/35195773","citation_count":8,"is_preprint":false},{"pmid":"14684985","id":"PMC_14684985","title":"Origin and possible roles of the SOX8 transcription factor gene during sexual development.","date":"2003","source":"Cytogenetic and genome research","url":"https://pubmed.ncbi.nlm.nih.gov/14684985","citation_count":8,"is_preprint":false},{"pmid":"33088929","id":"PMC_33088929","title":"The transcription factors SF-1 and SOX8 cooperate to upregulate Cx43 expression in mouse TM4 sertoli cells.","date":"2020","source":"Biochemistry and biophysics reports","url":"https://pubmed.ncbi.nlm.nih.gov/33088929","citation_count":8,"is_preprint":false},{"pmid":"21161367","id":"PMC_21161367","title":"Isolation and expression of two distinct Sox8 genes in mudloach (Misgurnus anguillicaudatus).","date":"2010","source":"Biochemical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21161367","citation_count":8,"is_preprint":false},{"pmid":"36246971","id":"PMC_36246971","title":"SOX8 Knockdown Overcomes Enzalutamide Resistance in Castration-Resistant Prostate Cancer by Inhibiting the Notch Signaling Pathway.","date":"2022","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/36246971","citation_count":8,"is_preprint":false},{"pmid":"20861569","id":"PMC_20861569","title":"cDNA cloning and expression analysis of two distinct Sox8 genes in Paramisgurnus dabryanus (Cypriniformes).","date":"2010","source":"Journal of genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20861569","citation_count":8,"is_preprint":false},{"pmid":"19638316","id":"PMC_19638316","title":"Evolutionary conserved sequence elements with embryonic enhancer activity in the vicinity of the mammalian Sox8 gene.","date":"2009","source":"The international journal of biochemistry & cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/19638316","citation_count":8,"is_preprint":false},{"pmid":"33190587","id":"PMC_33190587","title":"The oncogenic role of SOX8 in endometrial carcinoma.","date":"2020","source":"Cancer biology & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/33190587","citation_count":7,"is_preprint":false},{"pmid":"35412350","id":"PMC_35412350","title":"Regulation of Sox8 through lncRNA Mrhl-Mediated Chromatin Looping in Mouse Spermatogonia.","date":"2022","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/35412350","citation_count":7,"is_preprint":false},{"pmid":"36943308","id":"PMC_36943308","title":"SOX8 is essential for male sexual differentiation in the Chinese soft-shelled turtle Pelodiscus sinensis‡.","date":"2023","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/36943308","citation_count":7,"is_preprint":false},{"pmid":"30811727","id":"PMC_30811727","title":"The evolution and possible role of two Sox8 genes during sex differentiation in Japanese flounder (Paralichthys olivaceus).","date":"2019","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/30811727","citation_count":6,"is_preprint":false},{"pmid":"38046159","id":"PMC_38046159","title":"SOX8 promotes tumor growth and metastasis through FZD6-dependent Wnt/β-catenin signaling in colorectal carcinoma.","date":"2023","source":"Heliyon","url":"https://pubmed.ncbi.nlm.nih.gov/38046159","citation_count":5,"is_preprint":false},{"pmid":"32411596","id":"PMC_32411596","title":"Quantitative Proteomic Profiling Identifies SOX8 as Novel Regulator of Drug Resistance in Gestational Trophoblastic Neoplasia.","date":"2020","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/32411596","citation_count":5,"is_preprint":false},{"pmid":"29520762","id":"PMC_29520762","title":"Cooperation of Sall4 and Sox8 transcription factors in the regulation of the chicken Sox3 gene during otic placode development.","date":"2018","source":"Development, growth & differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/29520762","citation_count":5,"is_preprint":false},{"pmid":"32048324","id":"PMC_32048324","title":"Variation analysis of SOX8 gene in Chinese men with non-obstructive azoospermia or oligozoospermia.","date":"2020","source":"Andrologia","url":"https://pubmed.ncbi.nlm.nih.gov/32048324","citation_count":4,"is_preprint":false},{"pmid":"39201442","id":"PMC_39201442","title":"Transcription Factors Sox8 and Sox10 Contribute with Different Importance to the Maintenance of Mature Oligodendrocytes.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39201442","citation_count":3,"is_preprint":false},{"pmid":"38235364","id":"PMC_38235364","title":"Biallelic SOX8 Variants Associated With Novel Syndrome With Myopathy, Skeletal Deformities, Intellectual Disability, and Ovarian Dysfunction.","date":"2023","source":"Neurology. Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/38235364","citation_count":3,"is_preprint":false},{"pmid":"11474187","id":"PMC_11474187","title":"Mouse Sox8 is located between, not within,the t-complex deletions t(w18) and t(h20) on chromosome 17.","date":"2001","source":"Cytogenetics and cell genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11474187","citation_count":3,"is_preprint":false},{"pmid":"29874336","id":"PMC_29874336","title":"miRNA-124 down-regulates SOX8 expression and suppresses cell proliferation in non-small cell lung cancer [Retraction].","date":"2016","source":"International journal of clinical and experimental pathology","url":"https://pubmed.ncbi.nlm.nih.gov/29874336","citation_count":1,"is_preprint":false},{"pmid":"40467997","id":"PMC_40467997","title":"EHMT1 mediates cellular motility in embryonal rhabdomyosarcoma by activating SOX8 expression.","date":"2025","source":"British journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/40467997","citation_count":0,"is_preprint":false},{"pmid":"40918640","id":"PMC_40918640","title":"TRIM25-Mediated Ubiquitination and Degradation of SOX8 Promotes Ligament Fibroblast Osteogenic Differentiation and Regulates OPLL Progression by Inhibiting OSR2 Transcription.","date":"2025","source":"JOR spine","url":"https://pubmed.ncbi.nlm.nih.gov/40918640","citation_count":0,"is_preprint":false},{"pmid":"41214364","id":"PMC_41214364","title":"Sox8 is essential for vertebrate gastrulation.","date":"2025","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/41214364","citation_count":0,"is_preprint":false},{"pmid":"41648182","id":"PMC_41648182","title":"Sox8 and Sox9 regulate differentiation and nuclear positioning of retinal Müller glia.","date":"2026","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/41648182","citation_count":0,"is_preprint":false},{"pmid":"39769160","id":"PMC_39769160","title":"Molecular Analysis of the Differential Activity of Sox8 and Sox10 in Oligodendroglial Cells.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39769160","citation_count":0,"is_preprint":false},{"pmid":"41668040","id":"PMC_41668040","title":"SOX8/CPT2 axis regulates lipid metabolism to support enzalutamide resistance in prostate cancer.","date":"2026","source":"Cancer cell international","url":"https://pubmed.ncbi.nlm.nih.gov/41668040","citation_count":0,"is_preprint":false},{"pmid":"40950665","id":"PMC_40950665","title":"Role of the transcription factor SOX8 in hepatocellular carcinoma development and lymph node metastasis.","date":"2025","source":"Translational cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/40950665","citation_count":0,"is_preprint":false},{"pmid":"41657800","id":"PMC_41657800","title":"SOX8 mediates the crosstalk between KRAS and TGF-β pathways to promote the malignant progression of pancreatic cancer.","date":"2026","source":"American journal of cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/41657800","citation_count":0,"is_preprint":false},{"pmid":"42189834","id":"PMC_42189834","title":"EphA2/SHP2/SOX8 Axis: A Novel Target for Regulation of Migration and Cetuximab Treatment Sensitivity in Oral Squamous Cell Carcinoma.","date":"2026","source":"Molecular carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/42189834","citation_count":0,"is_preprint":false},{"pmid":"42104439","id":"PMC_42104439","title":"Exosomal circPOLK promotes metastasis of NSCLC cells via regulating mir-1204/SOX8 axis.","date":"2026","source":"Cancer cell international","url":"https://pubmed.ncbi.nlm.nih.gov/42104439","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.10.03.680132","title":"Dynamic and non-uniform expression of key transcription factors provides novel insights into the emergence of neural crest cells at the neural plate border","date":"2025-10-03","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.03.680132","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":43153,"output_tokens":8448,"usd":0.128089,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18561,"output_tokens":7169,"usd":0.136015,"stage2_stop_reason":"end_turn"},"total_usd":0.264104,"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\": 2003,\n      \"finding\": \"SOX8 binds specifically to SOX binding sites within the Amh minimal promoter and activates Amh transcription synergistically with SF1 through direct protein-protein interaction, albeit at lower levels than SOX9.\",\n      \"method\": \"In vitro DNA binding assays, luciferase reporter assays, co-immunoprecipitation/protein-protein interaction assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro binding assay, reporter assay, and direct protein-protein interaction demonstrated in single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"12732652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"SOX8 protein binds to canonical SOX target DNA sequences and activates transcription through two separate trans-activation regions located in the central part of the protein (distinct from the C-terminal location in SOX9/SOX10).\",\n      \"method\": \"In vitro transcription/reporter assays, protein domain mapping\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reporter assay with domain mapping, single lab, single study\",\n      \"pmids\": [\"10684944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Double knockout analyses in mice show that Sox8 reinforces Sox9 function in testis differentiation; combined loss of Sox8 and Sox9 causes more severe defects than loss of Sox9 alone, establishing genetic redundancy between the two factors in Sertoli cell differentiation.\",\n      \"method\": \"Conditional gene targeting / double knockout mouse genetics, epistasis analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous double-mutant mouse genetics with defined cellular phenotype, replicated across related studies\",\n      \"pmids\": [\"15056615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Sox8 binds to naturally occurring Sox10 response elements and forms DNA-dependent heterodimers with Sox10, activating Sox10-specific oligodendrocytic target genes; Sox8 and Sox10 act redundantly in terminal oligodendrocyte differentiation, with Sox8 having weaker impact due to lower expression levels.\",\n      \"method\": \"Electrophoretic mobility shift assay / DNA binding, heterodimer formation assay, reporter gene assays, Sox8-deficient mouse analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal methods (DNA binding, heterodimerization, reporter assays, knockout phenotype) in single rigorous study\",\n      \"pmids\": [\"15102707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Sox8 acts as a modifier gene for Sox10-dependent enteric nervous system development; loss of Sox8 alleles in Sox10 heterozygous mice dramatically increases apoptosis in vagal neural crest cells, reducing the pool of undifferentiated progenitors required for gut colonization.\",\n      \"method\": \"Genetic epistasis (Sox8/Sox10 compound mutant mice), apoptosis assays, lineage analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — compound mutant mouse genetics with mechanistic cellular phenotype (apoptosis of vagal neural crest), multiple methods\",\n      \"pmids\": [\"15572147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Combined loss of Sox8 and Sox9 in the embryonic spinal cord leads to near-complete loss of oligodendrocytes, while loss of Sox8 alone only enhances the Sox9-dependent defect, establishing that oligodendrocyte development relies on differential contribution of all three group E Sox proteins.\",\n      \"method\": \"Double knockout mouse genetics, cell counting, proliferation and apoptosis assays\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous double-knockout epistasis with quantitative cellular phenotype, replicated by related studies\",\n      \"pmids\": [\"15893981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Sox8 negatively regulates osteoblast differentiation; Sox8-deficient mice show precocious osteoblast differentiation and low bone mass, and Sox8 overexpression under Col1a1 promoter strongly reduces Runx2 expression and impairs bone formation.\",\n      \"method\": \"Sox8 knockout and transgenic mouse models, bone histomorphometry, ex vivo osteoblast differentiation, qRT-PCR for Runx2\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain- and loss-of-function mouse models with defined molecular target (Runx2), multiple orthogonal methods\",\n      \"pmids\": [\"15753123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Sox8 overexpression in myoblasts inhibits myotube formation, reduces MyoD and myogenin expression, and strongly reduces basal and MyoD-induced myogenin promoter activity, acting as a negative regulator of skeletal muscle differentiation by interfering with myogenic bHLH proteins.\",\n      \"method\": \"Overexpression in myoblast cell culture, luciferase reporter assay, Western blot/RT-PCR\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, differentiation phenotype, gene expression), single lab\",\n      \"pmids\": [\"12782625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In Xenopus, morpholino-mediated knockdown of Sox8 delays the timing of neural crest induction at the neural plate border and prevents neural crest cell migration into the periphery, without affecting specification or survival of progenitors.\",\n      \"method\": \"Morpholino knockdown in Xenopus embryos, in situ hybridization, lineage tracing\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined cellular/migration phenotype, multiple readouts, single lab\",\n      \"pmids\": [\"16943273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Replacement of Sox10 with Sox8 by targeted mutagenesis in mice shows incomplete functional equivalence: Sox8 almost fully rescues peripheral nervous system glia and neurons but fails to rescue melanocyte development, and only partially rescues enteric nervous system and oligodendrocyte defects.\",\n      \"method\": \"Targeted gene replacement (knock-in) mouse genetics, histological and molecular analysis of multiple lineages\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knock-in replacement strategy in multiple tissues with quantitative phenotypic readouts, rigorous genetic design\",\n      \"pmids\": [\"16790476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SOX8 protein is a product of adult Sertoli cells; its elimination causes age-dependent deregulation of spermatogenesis including spermatocyte/spermatid sloughing, spermiation failure, and progressive disorganization of the spermatogenic cycle, establishing SOX8 as a critical regulator of adult Sertoli cell function.\",\n      \"method\": \"Sox8 null mouse analysis, histological/cellular analysis, protein localization\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — detailed phenotypic and molecular analysis of knockout mouse with defined Sertoli cell localization, replicated by independent lab\",\n      \"pmids\": [\"18342849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Adult Sox8-deficient mice develop progressive degeneration of adipose tissue, with elevated preadipocyte marker Pref-1 and impaired differentiation of Sox8-deficient fibroblasts to adipocytes in culture, which is rescued by reintroducing Sox8, suggesting a precursor-intrinsic role in adipocyte pool replenishment.\",\n      \"method\": \"Sox8 knockout mouse analysis, cell culture differentiation assay, rescue experiment by Sox8 re-expression\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout phenotype with in vitro rescue experiment, multiple methods, single lab\",\n      \"pmids\": [\"19286648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SOX8 binds directly to the claudin-3 promoter (confirmed by ChIP) in Sertoli cells; Sox8-deficient mice have decreased claudin-3 protein, increased blood-testis barrier permeability (biotin tracer), and destabilized microtubule structures in testes.\",\n      \"method\": \"Chromatin immunoprecipitation, Western blot, biotin tracer permeability assay, electron microscopy\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP for direct promoter binding plus functional barrier permeability assay and ultrastructural analysis, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"23595903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Ablation of Sox9 in Sertoli cells of adult Sox8-null mice causes testis-to-ovary genetic reprogramming, with Sertoli cells transdifferentiating into granulosa-like cells; SOX9/8 maintain Dmrt1 expression and are required for adult testis maintenance.\",\n      \"method\": \"Conditional knockout mouse genetics (Sox9 ablation on Sox8-/- background), histology, immunostaining for lineage markers\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — compound conditional knockout with mechanistic pathway placement (Sox9/8→Dmrt1), replicated by related studies\",\n      \"pmids\": [\"27328324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Aurora-A kinase directly binds SOX8 and phosphorylates it at Ser327, which enhances FOXK1 expression and regulates downstream genes related to cell senescence (hTERT, P16) and glycolysis (LDHA, HK2), promoting cisplatin resistance in ovarian cancer.\",\n      \"method\": \"Immunoprecipitation, mass spectrometry, FRET-FLIM, luciferase reporter assay, ChIP, in vitro phosphorylation assay\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct binding and phosphorylation site identified by IP/MS/FLIM with functional validation by reporter and ChIP, multiple orthogonal methods in single study\",\n      \"pmids\": [\"32550913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX8 binds to the promoter region of Frizzled-7 (FZD7) and induces FZD7-mediated activation of the Wnt/β-catenin pathway, conferring chemoresistance and cancer stem-like properties in cisplatin-resistant tongue squamous cell carcinoma.\",\n      \"method\": \"Chromatin immunoprecipitation, luciferase reporter assay, SOX8 knockdown with functional rescue by active β-catenin\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assay for direct promoter binding plus functional rescue experiment, single lab\",\n      \"pmids\": [\"29071717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sox8 expression in intestinal M cells requires RANKL-RelB signaling; Sox8 directly binds the Gp2 promoter (by ChIP and luciferase assay) to drive Gp2 expression; Sox8-deficient mice have markedly fewer mature M cells and reduced antigen uptake and IgA responses.\",\n      \"method\": \"Sox8 knockout mouse, chromatin immunoprecipitation, luciferase reporter assay, flow cytometry, immunostaining\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct promoter binding by ChIP, reporter assay, and defined in vivo phenotype in knockout mouse with functional immune readout\",\n      \"pmids\": [\"30877171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SOXE proteins (SOX8, SOX9, SOX10) share a bipartite transactivation mechanism: a transactivation domain in the middle of the protein (TAM) with amphipathic α-helices synergizes with a C-terminal domain (TAC); TAM contains a conserved EΦ[D/E]QYΦ motif required for function.\",\n      \"method\": \"Mutagenesis, transactivation reporter assays, structural prediction, evolutionary sequence analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of defined motif with functional reporter assay validation, multiple SOXE members tested, single lab\",\n      \"pmids\": [\"31194875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SOX8 and SF1 cooperate to regulate Gja1/Cx43 expression in Sertoli cells; cJUN cooperates with SOX8 or SOX9 via the -47 bp AP-1 element of the Gja1 promoter to drive Cx43 expression.\",\n      \"method\": \"Co-transfection/luciferase reporter assays with Gja1 promoter constructs, in Sertoli cell lines\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter-reporter and co-transfection assays identifying functional element, single lab\",\n      \"pmids\": [\"30080944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SOX8 and SF-1 cooperate to activate Cx43/connexin43 expression in Sertoli cells; SF-1 is recruited to the proximal -132 to -26 bp region of the Cx43 promoter as confirmed by ChIP.\",\n      \"method\": \"Co-transfection luciferase reporter assays, chromatin immunoprecipitation\",\n      \"journal\": \"Biochemistry and biophysics reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter assay confirming direct promoter recruitment, single lab\",\n      \"pmids\": [\"33088929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Sox8 is a direct transcriptional target of Nfia in neural stem/precursor cells; Sox8 promotes LIF-induced astrocytic differentiation by associating with STAT3 through transcriptional coactivator p300, without inducing DNA demethylation of Gfap.\",\n      \"method\": \"ChIP for Nfia binding at Sox8 locus, Sox8 knockdown/overexpression, co-immunoprecipitation of Sox8-p300-STAT3, reporter assay\",\n      \"journal\": \"Pharmacology research & perspectives\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus co-IP plus functional differentiation assay, single lab with multiple methods\",\n      \"pmids\": [\"34677001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Sox8 and Sox9 are required for Müller glial cell development in mouse retina; both genes are regulated by Notch signaling, which controls their transcription as shown using activated Notch and gamma-secretase inhibitor DAPT.\",\n      \"method\": \"shRNA knockdown, activated Notch overexpression, gamma-secretase inhibitor treatment, retinal cell proportion analysis\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — shRNA loss-of-function and pharmacological manipulation with defined cell-type phenotype, single lab\",\n      \"pmids\": [\"19490914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Sox9 and Sox8 jointly maintain basal lamina integrity of testis cords by controlling expression of collagen IV, collagen IXa3, testatin, and Scleraxis; combined loss leads to delamination of Sertoli cells and progressive FOXL2 upregulation indicating transdifferentiation.\",\n      \"method\": \"Conditional double-knockout mouse genetics, lineage tracing, immunostaining for structural/molecular markers\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — compound conditional knockout with mechanistic molecular markers (collagen IV, scleraxis, FOXL2) and lineage tracing\",\n      \"pmids\": [\"22837482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Genetic ablation of Sox8 and Sox9 together, but not either alone, prevents ovarian-to-testicular reprogramming in XX Rspo1-null mice, demonstrating that Sox8 alone can compensate for Sox9 loss in driving Sertoli cell differentiation during female-to-male sex reversal.\",\n      \"method\": \"Triple mutant mouse genetics (Rspo1-/- Sox8-/- Sox9 compound mutants), gonad morphology and marker analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — triple-mutant epistasis with defined cellular fate readout, rigorous genetic design\",\n      \"pmids\": [\"32450947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In mouse spermatogonial cells, lncRNA Mrhl binds the Sox8 promoter along with Myc-Max-Mad transcription factors, corepressor Sin3a, and coactivator Pcaf to regulate Sox8 transcription; upon Wnt signaling activation and Mrhl downregulation, Sox8 directly regulates expression of premeiotic and meiotic markers.\",\n      \"method\": \"Chromatin immunoprecipitation, RNA-protein interaction assays, promoter reporter assays, Sox8 knockdown/overexpression\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and functional reporter assays identifying direct binding at Sox8 promoter, single lab\",\n      \"pmids\": [\"28461394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"lncRNA Mrhl regulates Sox8 in spermatogonia via CTCF/cohesin-mediated chromatin looping that brings the Sox8 promoter in contact with a silencer element when Mrhl is present; Mrhl interacts with the Sox8 locus through DNA:DNA:RNA triplex formation recruiting PRC2; upon Mrhl downregulation, a promoter-enhancer loop mediated by YY1 activates Sox8 transcription.\",\n      \"method\": \"Chromatin conformation capture (3C/loop assays), triplex formation assay, PRC2 ChIP, YY1 ChIP\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple chromatin architecture methods plus ChIP, single lab\",\n      \"pmids\": [\"35412350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Sox8 is placed at the top of the ear determination network in cranial ectoderm; introducing Sox8 into non-ear cranial ectoderm converts cells to ear progenitors and activates programs for ear morphogenesis and neurogenesis, as established by gain-of-function and multiomics approaches.\",\n      \"method\": \"Loss-of-function experiments, Sox8 gain-of-function in cranial ectoderm, multiomics (ATAC-seq/RNA-seq)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function cell fate conversion plus loss-of-function with multiomics validation, single rigorous study\",\n      \"pmids\": [\"35867760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SOX8 and SOX9 jointly promote commitment of growth plate reserve chondrocytes to columnar proliferating cells; compound Sox8/Sox9 inactivation in limb skeletal cells causes 15-20% shortening of long bones; SOX8 overexpression is more efficient than SOX9 at promoting chondrocyte proliferation and differentiation, possibly due to greater protein stability.\",\n      \"method\": \"Conditional single and compound knockout mouse genetics, SOX8/SOX9 overexpression in chondrocytes, growth plate histomorphometry, high-throughput gene expression assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — compound conditional knockout plus reciprocal overexpression in same system, quantitative growth phenotype, multiple methods\",\n      \"pmids\": [\"38346197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Sox8 is essential for oligodendrocyte precursor cell proliferation and timely remyelination; Sox8-/- mice in the cuprizone model show reduced OPC proliferation at peak demyelination and fewer mature oligodendrocytes during remyelination, with delayed myelin marker recovery.\",\n      \"method\": \"Sox8 knockout mouse in cuprizone demyelination model, immunohistochemistry for oligodendroglial/myelin markers, motor performance testing\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — disease model with defined cellular and molecular phenotype in knockout, single lab\",\n      \"pmids\": [\"38097655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SOX8 transcriptionally regulates EZH2 in pancreatic cancer, which then reduces SPARC expression via histone methylation, thereby reducing albumin-bound paclitaxel transport and conferring chemoresistance.\",\n      \"method\": \"ChIP, reporter assays, EZH2 inhibitor rescue, Western blot\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assay for direct SOX8-EZH2 promoter regulation with pharmacological rescue, single lab\",\n      \"pmids\": [\"35173526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SOX8 binds directly to the HGF promoter and transcriptionally activates HGF expression, which activates the HGF/MET bypass pathway to induce cetuximab resistance in colorectal cancer cells.\",\n      \"method\": \"Chromatin immunoprecipitation, promoter-luciferase reporter assay\",\n      \"journal\": \"Cancer chemotherapy and pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assay confirming direct promoter binding, single lab\",\n      \"pmids\": [\"35195773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SOX8 directly binds the FZD6 promoter and transcriptionally activates FZD6-dependent Wnt/β-catenin signaling to promote tumor growth in colorectal carcinoma; SOX8 knockdown reduces phospho-GSK3β and FZD6, rescued by FZD6 restoration.\",\n      \"method\": \"Luciferase reporter assay, knockdown/rescue experiment, Western blot\",\n      \"journal\": \"Heliyon\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — reporter assay plus functional rescue, single lab\",\n      \"pmids\": [\"38046159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"EHMT1 upregulates SOX8 expression via regulation of BRD4 expression, leading to increased BRD4 occupancy at the SOX8 promoter; SOX8 in turn regulates integrin gene expression to promote migration and invasion in embryonal rhabdomyosarcoma.\",\n      \"method\": \"ChIP for BRD4 at SOX8 promoter, EHMT1/SOX8 knockdown, RNA-seq, in vitro migration/invasion and in vivo metastasis assays\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus RNA-seq plus in vivo metastasis assays, single lab\",\n      \"pmids\": [\"40467997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM25 is an E3 ubiquitin ligase that interacts with SOX8 (by co-immunoprecipitation) and promotes its ubiquitination and proteasomal degradation; reduced SOX8 levels promote osteogenic differentiation of ligament fibroblasts, and SOX8 inhibits this process partly by transcriptionally activating OSR2.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, mass spectrometry, dual-luciferase reporter assay, in vitro and in vivo osteogenic differentiation models\",\n      \"journal\": \"JOR spine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ubiquitination assay, and reporter assay identifying writer and downstream target, single lab\",\n      \"pmids\": [\"40918640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Xenopus, Sox8 directly binds the kremen2 (Wnt inhibitor) promoter (confirmed by ChIP) and transcriptionally activates kremen2 expression; Sox8 depletion via CRISPR leads to blastopore closure defects, impaired AP axis elongation, abnormal ventral expansion of wnt11b, increased nuclear β-catenin, and reduced BMP signaling, establishing Sox8 as a regulator of Wnt signaling during gastrulation.\",\n      \"method\": \"CRISPR-DiCas7-11 depletion, ChIP, transcriptomic analysis, in situ hybridization, β-catenin localization\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — CRISPR loss-of-function plus direct ChIP binding evidence plus transcriptomic validation, single rigorous study\",\n      \"pmids\": [\"41214364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In the chicken otic placode, Sox8 binds the Otic1 enhancer of the Sox3 gene (confirmed by ChIP-qPCR) and cooperates with Sall4 to activate Sox3 transcription, establishing a direct transcriptional regulatory interaction in otic placode specification.\",\n      \"method\": \"ChIP-qPCR, luciferase reporter assays, enhancer dissection\",\n      \"journal\": \"Development, growth & differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirmation of direct binding plus functional reporter assay, single lab\",\n      \"pmids\": [\"29520762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In adult oligodendrocytes, Sox8 deletion alone does not alter oligodendrocyte numbers or myelin structure, but combined Sox8/Sox10 deletion causes substantially greater alterations in oligodendrocyte expression profiles than Sox10 deletion alone; the differential transcriptional activity of Sox8 vs Sox10 depends on the N-terminal one-third of the protein, not the known C-terminal transactivation domains.\",\n      \"method\": \"Targeted Sox8/Sox10 deletion in adult mouse brains, RNA-sequencing of corpus callosum, protein domain swap experiments in oligodendroglial cell line\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — conditional knockout plus RNA-seq plus domain mapping in cell line, single lab\",\n      \"pmids\": [\"39201442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Molecular analysis in the oligodendroglial Oln93 cell line shows that Sox8 regulates the same gene targets as Sox10 but with substantially lower transcriptional activity despite comparable binding to regulatory regions; the differential activity maps to the N-terminal one-third of the Sox protein, not the C-terminal transactivation domains.\",\n      \"method\": \"Gene replacement in oligodendroglial cell line, transcriptomic profiling (RNA-seq), chromatin binding comparison\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — cell line replacement experiment with genome-wide expression and binding analysis, single lab\",\n      \"pmids\": [\"39769160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"hnRNPU interacts with SOX9 and enhances Sox8 and Sox9 expression in Sertoli cells by directly binding to their promoter regions; hnRNPU conditional knockout in Sertoli cells causes testicular atrophy, depletion of Sertoli and germ cells, and male sterility.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-qPCR, luciferase assay, conditional knockout mouse, RNA-seq\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and co-IP plus conditional KO phenotype, single lab\",\n      \"pmids\": [\"34815802\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SOX8 is a SOXE-group HMG-box transcription factor that binds canonical SOX DNA sequences and activates transcription through a bipartite mechanism (central TAM and C-terminal TAC domains); it acts largely redundantly with SOX9 and SOX10 across multiple developmental contexts (testis, oligodendrocytes, neural crest, chondrocytes), reinforcing SOX9 function in Sertoli cell identity and adult testis maintenance (including blood-testis barrier integrity via direct claudin-3 regulation), promoting terminal oligodendrocyte differentiation and remyelination, specifying M cells by directly activating Gp2 transcription, and inhibiting myoblast and osteoblast differentiation via Runx2 suppression; SOX8 activity is post-translationally regulated by Aurora-A-mediated phosphorylation at Ser327 and by TRIM25-mediated ubiquitination/degradation, and its transcription is controlled at the chromatin level by lncRNA Mrhl through CTCF/cohesin looping and PRC2 recruitment.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SOX8 is a SOXE-group HMG-box transcription factor that binds canonical SOX DNA elements and activates transcription through a bipartite mechanism, in which a central transactivation domain (TAM) bearing a conserved E\\u03a6[D/E]QY\\u03a6 motif and amphipathic \\u03b1-helices synergizes with a C-terminal domain (TAC) [#1, #17]. Across diverse developmental settings it acts largely redundantly with the related SOXE factors SOX9 and SOX10, typically as a weaker partner, and can form DNA-dependent heterodimers with SOX10 on shared response elements [#3, #5, #9]. In the testis, SOX8 reinforces SOX9 to establish and maintain Sertoli cell identity: combined loss produces defects more severe than SOX9 loss alone, the two factors sustain Dmrt1 and basal lamina integrity, and their joint ablation drives Sertoli-to-granulosa transdifferentiation and testis-to-ovary reprogramming [#2, #13, #22, #23]. SOX8 maintains adult spermatogenesis and blood-testis barrier integrity through direct activation of the claudin-3 promoter [#10, #12]. In the CNS, SOX8 promotes oligodendrocyte differentiation and remyelination redundantly with SOX10, regulating overlapping targets but with intrinsically lower transcriptional output that maps to the N-terminal third of the protein rather than the C-terminal transactivation domains [#5, #28, #36, #37]. SOX8 also acts as a fate-determining factor at the top of the ear-determination network and specifies intestinal M cells by directly activating Gp2 downstream of RANKL-RelB signaling [#16, #26], and it directly regulates Wnt-pathway components during vertebrate gastrulation [#34]. It negatively regulates myoblast and osteoblast differentiation, in the latter case by suppressing Runx2 [#6, #7], while promoting growth-plate chondrocyte commitment together with SOX9 [#27]. SOX8 activity is post-translationally controlled by Aurora-A-mediated phosphorylation at Ser327 and by TRIM25-mediated ubiquitination and proteasomal degradation, and its transcription is set at the chromatin level by lncRNA Mrhl through CTCF/cohesin looping and PRC2 recruitment [#14, #25, #33]. In cancers, SOX8 acts as an oncogenic transcription factor that confers therapy resistance through direct activation of Wnt receptors and bypass-signaling genes [#15, #30, #31].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that SOX8 is a functional sequence-specific transactivator and defined where in the protein its activation capacity resides, distinguishing it from SOX9/SOX10.\",\n      \"evidence\": \"In vitro transcription/reporter assays with domain mapping\",\n      \"pmids\": [\"10684944\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No genomic target genes identified\", \"Structural basis of the activation domains not resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed SOX8 engages a physiological target by binding the Amh promoter and synergizing with SF1, placing it in the Sertoli-cell sex-determination circuitry as a weaker SOX9-like activator.\",\n      \"evidence\": \"In vitro DNA binding, luciferase reporter, and co-IP for SOX8\\u2013SF1 interaction\",\n      \"pmids\": [\"12732652\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro only; in vivo relevance to Amh not tested\", \"Relative contribution vs SOX9 not quantified\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Revealed a non-developmental-glial role: SOX8 antagonizes myogenic differentiation by interfering with bHLH factors, showing it can act as a transcriptional repressor of lineage programs.\",\n      \"evidence\": \"Myoblast overexpression, myogenin promoter reporter, RT-PCR/Western\",\n      \"pmids\": [\"12782625\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DNA binding at myogenic loci not shown\", \"Mechanism of bHLH interference unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined functional redundancy with SOX9 in Sertoli cell differentiation, establishing the SOXE redundancy paradigm in the testis.\",\n      \"evidence\": \"Sox8/Sox9 double-knockout mouse epistasis\",\n      \"pmids\": [\"15056615\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct shared target genes not defined here\", \"Molecular basis of synergy not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated SOX8 forms DNA-dependent heterodimers with SOX10 and acts redundantly in oligodendrocyte differentiation, explaining its weaker contribution as a function of lower expression.\",\n      \"evidence\": \"EMSA, heterodimerization and reporter assays, Sox8-deficient mouse\",\n      \"pmids\": [\"15102707\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether weakness is purely expression-level or intrinsic not settled here\", \"Genome-wide co-occupancy not mapped\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended the redundancy model across SOXE factors in oligodendrocyte development and to neural crest survival, showing SOX8 functions as a dose-sensitive modifier of SOX10.\",\n      \"evidence\": \"Sox8/Sox9 double-KO spinal cord and Sox8/Sox10 compound-mutant ENS genetics with apoptosis assays\",\n      \"pmids\": [\"15893981\", \"15572147\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct targets controlling progenitor survival not identified\", \"Tissue-specific quantitative dose relationships not fully defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified SOX8 as a negative regulator of osteoblast differentiation acting through Runx2 suppression, broadening its role to skeletal lineage restraint.\",\n      \"evidence\": \"Reciprocal Sox8 knockout and Col1a1-transgenic mouse models, bone histomorphometry, Runx2 qRT-PCR\",\n      \"pmids\": [\"15753123\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Runx2 regulation is direct not shown\", \"Mechanism of repression undefined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Quantified the limits of SOXE interchangeability by replacing Sox10 with Sox8 in vivo, showing lineage-specific incomplete equivalence (e.g., failure to rescue melanocytes).\",\n      \"evidence\": \"Sox8-into-Sox10 knock-in mouse, multi-lineage histology\",\n      \"pmids\": [\"16790476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular determinants of lineage-specific failure not mapped here\", \"Distinct from later N-terminal domain mapping\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Assigned SOX8 a role in neural crest induction timing and migration in a vertebrate embryo model.\",\n      \"evidence\": \"Morpholino knockdown in Xenopus, in situ hybridization, lineage tracing\",\n      \"pmids\": [\"16943273\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct migration-controlling targets not identified\", \"Morpholino specificity not independently confirmed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Established SOX8 as a critical regulator of adult Sertoli cell function and ongoing spermatogenesis, beyond embryonic differentiation.\",\n      \"evidence\": \"Sox8-null mouse histology and protein localization\",\n      \"pmids\": [\"18342849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct adult target genes not defined here\", \"Age-dependence mechanism unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Broadened SOX8 function to precursor maintenance in adipose tissue and to retinal Muller glia development under Notch control, indicating roles in progenitor pools across tissues.\",\n      \"evidence\": \"Sox8-KO mouse adipose analysis with in vitro rescue; retinal shRNA plus Notch/DAPT manipulation\",\n      \"pmids\": [\"19286648\", \"19490914\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct adipocyte/Muller-glia target genes not identified\", \"Notch\\u2192Sox8 link is regulatory, not shown to be direct\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed SOX9/SOX8 maintain testis cord basal lamina integrity through structural-gene programs, with loss triggering Sertoli transdifferentiation marked by FOXL2 upregulation.\",\n      \"evidence\": \"Conditional double-KO mouse, lineage tracing, marker immunostaining\",\n      \"pmids\": [\"22837482\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding to collagen/scleraxis loci not demonstrated\", \"Trigger of transdifferentiation not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided the first direct genomic target in the testis by demonstrating SOX8 binds and activates the claudin-3 promoter to maintain the blood-testis barrier.\",\n      \"evidence\": \"ChIP, Western, biotin tracer permeability assay, electron microscopy in Sox8-deficient mice\",\n      \"pmids\": [\"23595903\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other barrier targets not surveyed\", \"Microtubule destabilization mechanism indirect\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed SOX9/SOX8 above Dmrt1 in maintaining adult testicular identity, showing their combined loss reprograms the gonad toward the ovarian fate.\",\n      \"evidence\": \"Conditional Sox9 ablation on Sox8-null background, lineage-marker immunostaining\",\n      \"pmids\": [\"27328324\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect Dmrt1 regulation not resolved\", \"SOX8-only contribution not isolated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the chromatin-level control of Sox8 transcription by lncRNA Mrhl in spermatogonia and tied Sox8 output to Wnt signaling, and separately revealed an oncogenic Wnt-receptor target program.\",\n      \"evidence\": \"ChIP, RNA-protein interaction and reporter assays at the Sox8 promoter; ChIP/reporter for SOX8\\u2192FZD7 in tongue carcinoma\",\n      \"pmids\": [\"28461394\", \"29071717\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mrhl mechanism not yet resolved to chromatin architecture (addressed later)\", \"FZD7 study single-lab without in vivo validation\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified cooperating partners and direct cis-elements: SOX8 cooperates with SF1/cJUN at the Gja1/Cx43 promoter in Sertoli cells and with Sall4 at the Sox3 otic enhancer in placode specification.\",\n      \"evidence\": \"Co-transfection/reporter assays at Gja1; ChIP-qPCR and reporter at the Sox3 Otic1 enhancer\",\n      \"pmids\": [\"30080944\", \"29520762\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo requirement of these elements not tested\", \"Single-lab reporter-based evidence\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established SOX8 as the direct transcriptional driver of intestinal M cell identity via the Gp2 promoter downstream of RANKL-RelB, and refined the SOXE bipartite transactivation model with a conserved TAM motif.\",\n      \"evidence\": \"Sox8-KO mouse with ChIP/reporter at Gp2 and immune readouts; mutagenesis/reporter mapping of TAM/TAC across SOXE proteins\",\n      \"pmids\": [\"30877171\", \"31194875\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors at the Gp2 promoter not fully defined\", \"Structural model of TAM-TAC synergy not solved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed post-translational and upstream control of SOX8: Aurora-A phosphorylates Ser327 to drive a senescence/glycolysis program and chemoresistance, and confirmed SF1 recruitment to the Cx43 promoter.\",\n      \"evidence\": \"IP/MS/FRET-FLIM, in vitro phosphorylation, ChIP/reporter in ovarian cancer; ChIP/reporter for SF1 at Cx43\",\n      \"pmids\": [\"32550913\", \"33088929\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Ser327 phosphorylation operates in normal development not tested\", \"Structural consequence of phosphorylation unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated SOX8 alone can compensate for SOX9 loss in driving Sertoli differentiation, sharpening the functional-equivalence picture during sex reversal.\",\n      \"evidence\": \"Rspo1/Sox8/Sox9 compound-mutant mouse genetics with gonad marker analysis\",\n      \"pmids\": [\"32450947\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Threshold of SOX8 sufficiency not quantified\", \"Direct targets mediating compensation not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected SOX8 to upstream regulators and a cofactor in neural/Sertoli contexts: NFIA directly activates Sox8 and SOX8 partners with STAT3/p300 in astrocytic differentiation, while hnRNPU enhances Sox8/Sox9 expression in Sertoli cells.\",\n      \"evidence\": \"ChIP, co-IP, reporter and differentiation assays; Sertoli conditional hnRNPU-KO with ChIP/co-IP\",\n      \"pmids\": [\"34677001\", \"34815802\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct astrocytic SOX8 targets not mapped\", \"hnRNPU effect on Sox8 vs Sox9 not separable\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved the chromatin architecture by which Mrhl gates Sox8 (CTCF/cohesin silencer loop and PRC2 recruitment versus YY1 enhancer loop), and expanded oncogenic SOX8 mechanisms to EZH2/SPARC and HGF/MET resistance pathways.\",\n      \"evidence\": \"3C/loop assays, triplex assay, PRC2/YY1 ChIP at Sox8 locus; ChIP/reporter for SOX8\\u2192EZH2 and SOX8\\u2192HGF in cancer\",\n      \"pmids\": [\"35412350\", \"35173526\", \"35195773\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cancer mechanisms each single-lab\", \"In vivo relevance of the Mrhl architecture beyond spermatogonia untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Positioned SOX8 at the top of the ear-determination hierarchy, showing it is a fate-instructive master factor capable of converting cranial ectoderm to ear progenitors.\",\n      \"evidence\": \"Gain- and loss-of-function in cranial ectoderm with ATAC-seq/RNA-seq\",\n      \"pmids\": [\"35867760\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct pioneer activity on chromatin not formally demonstrated\", \"Downstream direct targets not individually validated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined SOX8 requirement for OPC proliferation and timely remyelination in a demyelination model, and added an oncogenic FZD6/Wnt target axis.\",\n      \"evidence\": \"Sox8-KO cuprizone model with myelin marker IHC; reporter/knockdown-rescue for SOX8\\u2192FZD6 in colorectal carcinoma\",\n      \"pmids\": [\"38097655\", \"38046159\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct OPC-proliferation targets not identified\", \"FZD6 study lacks direct ChIP/in vivo confirmation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed SOX8/SOX9 jointly drive growth-plate chondrocyte commitment and that SOX8's intrinsically distinct (and in oligodendrocytes weaker) transcriptional activity maps to its N-terminal third, not the C-terminal transactivation domains.\",\n      \"evidence\": \"Compound conditional KO and reciprocal overexpression in chondrocytes; adult Sox8/Sox10 KO RNA-seq and domain-swap experiments in oligodendroglial cells\",\n      \"pmids\": [\"38346197\", \"39201442\", \"39769160\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of N-terminal activity difference not resolved\", \"Whether protein-stability difference fully explains chondrocyte potency untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established TRIM25 as an E3 ligase degrading SOX8, identified OSR2 and integrin programs as downstream effectors, and showed SOX8 directly regulates kremen2 to modulate Wnt during gastrulation.\",\n      \"evidence\": \"Co-IP/ubiquitination/reporter (TRIM25, OSR2) in ligament fibroblasts; ChIP/RNA-seq (EHMT1\\u2192BRD4\\u2192SOX8\\u2192integrin) in rhabdomyosarcoma; CRISPR/ChIP/transcriptomics for Sox8\\u2192kremen2 in Xenopus\",\n      \"pmids\": [\"40918640\", \"40467997\", \"41214364\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"TRIM25 and EHMT1 axes each single-lab\", \"Integration of degradation control with developmental SOX8 dosage untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how SOX8's intrinsic transcriptional weakness, partner selectivity, and post-translational regulation are integrated to determine context-specific outputs across redundancy with SOX9/SOX10.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of the TAM/TAC transactivation surface or N-terminal activity-modulating region\", \"Genome-wide SOX8 vs SOX9/SOX10 occupancy maps across tissues incomplete\", \"Whether Aurora-A/TRIM25 regulation operates in developmental contexts unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 3, 12, 16, 17, 34]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 3, 12, 16, 34, 35]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [12, 14, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 12, 16, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 5, 9, 26, 27]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [2, 10, 13, 22, 23]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [15, 31, 34]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SOX9\", \"SOX10\", \"SF1\", \"Aurora-A\", \"TRIM25\", \"STAT3\", \"EP300\", \"hnRNPU\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}