{"gene":"SOX7","run_date":"2026-06-10T07:46:38","timeline":{"discoveries":[{"year":2001,"finding":"SOX7 protein contains a functional transactivation domain in its C-terminus and is able to significantly reduce Wnt/beta-catenin-stimulated transcription in cell-based reporter assays.","method":"Transactivation domain mapping; TCF/LEF reporter assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter assays with domain analysis, single lab, two orthogonal approaches","pmids":["11691915"],"is_preprint":false},{"year":2004,"finding":"SOX7 and SOX17 bind specifically to two SOX-binding sites within the laminin alpha1 (Lama1) parietal endoderm-specific enhancer and trans-activate Lama1 transcription in F9 cells; this activation is HMG-box-dependent and synergistic with Sp1/Sp3 and NF-Y binding sites upstream.","method":"EMSA, luciferase reporter assay, mutational analysis, Northern blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding (EMSA), reporter assay with mutational validation, multiple orthogonal methods in one study","pmids":["15220343"],"is_preprint":false},{"year":2004,"finding":"SOX7 competes with GATA-4 for occupancy of the PS4A element in the Fgf-3 promoter and acts as a potent activator of Fgf-3 transcription; RNAi knockdown of Sox7 in GATA-4-deficient embryoid bodies virtually abolishes Fgf-3 expression.","method":"Luciferase reporter assay, EMSA, siRNA knockdown, in situ hybridization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — EMSA demonstrating competitive binding, reporter assay, and RNAi functional validation; multiple orthogonal methods","pmids":["15082719"],"is_preprint":false},{"year":2004,"finding":"In F9 embryonal carcinoma cells, Sox7 acts upstream of Gata-4 and Gata-6 to regulate parietal endoderm differentiation; siRNA silencing of Sox7 blocks induction of Gata-4 and Gata-6 by retinoic acid/cAMP, while overexpression of Gata-4 or Gata-6 in Sox7-silenced cells restores differentiation.","method":"siRNA knockdown, overexpression, morphological analysis, Western blot, RT-PCR","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis established by loss-of-function and rescue experiments with multiple markers, replicated across conditions","pmids":["15542856"],"is_preprint":false},{"year":2005,"finding":"In Xenopus, SOX7 and SOX18 function redundantly to induce cardiogenesis through Xnr2 (nodal) signaling; SOX7 RNA rescues the SOX18 morpholino phenotype and vice versa. Versions of SOX7 with the C-terminal beta-catenin interaction domain replaced by a transcriptional activator still induce cardiogenesis, indicating beta-catenin interaction is dispensable for this activity.","method":"mRNA injection, morpholino knockdown, animal cap explant assay, marker gene expression","journal":"Developmental dynamics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal rescue experiments, domain deletion analysis, multiple functional readouts","pmids":["16193513"],"is_preprint":false},{"year":2007,"finding":"In zebrafish, sox7 and sox18 play redundant but collectively essential roles in establishing arteriovenous identity; simultaneous morpholino knockdown of both genes causes arteriovenous fusions with failure of venous endothelial cell differentiation while endothelial specification is maintained.","method":"Morpholino knockdown, transgenic line imaging, in situ hybridization with arteriovenous markers","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — combinatorial loss-of-function with defined molecular phenotype, multiple marker validation, replicated across two labs (see PMID:18377889)","pmids":["18094332"],"is_preprint":false},{"year":2008,"finding":"Zebrafish Sox7 and Sox18 control arterial-venous identity by regulating Gridlock (Hey2) expression; double morphants display ectopic venous marker Flt4 in the dorsal aorta and loss of artery-specific markers EphrinB2a and Gridlock.","method":"Morpholino knockdown, in situ hybridization, gene expression analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — defined epistatic relationship with Gridlock, multiple molecular markers, independent replication","pmids":["18377889"],"is_preprint":false},{"year":2008,"finding":"SOX7 protein physically interacts with beta-catenin and suppresses beta-catenin-mediated transcription by depleting active beta-catenin; promoter hypermethylation silences SOX7 in prostate and colorectal cancers.","method":"Co-immunoprecipitation, luciferase reporter assay, bisulfite sequencing, ectopic expression","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus reporter assay, single lab","pmids":["18819930"],"is_preprint":false},{"year":2009,"finding":"SOX7 and SOX17 can functionally substitute for SOX18 during lymphatic development in a strain-specific compensatory mechanism; they are activated specifically in the absence of SOX18 function in permissive strains.","method":"Genetic mouse model, conditional deletion, in vitro and in vivo functional substitution assays","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic complementation with defined molecular mechanism, multiple strains tested","pmids":["19515696"],"is_preprint":false},{"year":2009,"finding":"Sustained Sox7 expression in the earliest committed hematopoietic precursors (during ES cell differentiation) promotes maintenance of multipotent self-renewing status and blocks differentiation; removal of the Sox7 block leads to efficient erythroid and myeloid differentiation.","method":"Inducible Sox7 overexpression in ES cell differentiation system, flow cytometry, colony assays","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — inducible gain-of-function with defined cellular phenotype, single lab","pmids":["19801444"],"is_preprint":false},{"year":2012,"finding":"SOX7 binds and activates the VE-cadherin promoter in haemogenic endothelium; enforced SOX7 expression in haemangioblast-derived blast colonies blocks blood cell differentiation and sustains endothelial marker expression.","method":"Chromatin immunoprecipitation, luciferase reporter assay, ES cell differentiation gain-of-function","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP demonstrating direct promoter binding plus reporter assay and functional gain-of-function in defined progenitor system","pmids":["22492353"],"is_preprint":false},{"year":2012,"finding":"Haploinsufficiency of Sox7 in mice causes anterior retrosternal diaphragmatic hernias; homozygous Sox7 null embryos die with cardiovascular failure. SOX7 is expressed in vascular endothelial cells of the developing diaphragm.","method":"Targeted gene deletion (Sox7 exon 2 deletion), immunohistochemistry, mouse phenotyping","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — defined loss-of-function mouse model with specific phenotypic readout and localization data","pmids":["22723016"],"is_preprint":false},{"year":2014,"finding":"ETV2 directly binds to ETV2 binding elements in the Sox7 upstream regulatory region and activates Sox7 transcription; Sox7 overexpression mimics ETV2 in promoting endothelial progenitor expansion, and Sox7 knockdown blocks ETV2-induced endothelial progenitor formation and angiogenic sprouting.","method":"ChIP, luciferase reporter assay, shRNA knockdown, embryoid body differentiation assay","journal":"Stem cells and development","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP demonstrating direct binding plus reporter assay and epistasis by knockdown rescue experiments","pmids":["24762086"],"is_preprint":false},{"year":2015,"finding":"In zebrafish, sox7 mutants display arteriovenous shunt formation at specific arterial sites due to ectopic flt4 expression; genetic interaction experiments place Sox7 upstream of Notch (overexpression of Notch intracellular domain rescues sox7 mutant phenotype), and Sox7 interacts genetically with hey2 and efnb2 in arterial specification.","method":"Zebrafish sox7 mutant generation, in vivo imaging, in situ hybridization, genetic epistasis (NICD overexpression rescue), combinatorial mutant analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — defined mutant model with epistasis experiments placing Sox7 upstream of Notch; multiple orthogonal approaches","pmids":["25834021"],"is_preprint":false},{"year":2015,"finding":"In the mouse retina, Sox7 and Sox17 reciprocally regulate each other's expression; combined deletion of Sox7, Sox17, and Sox18 causes loss of arterial identity (loss of radial arteries/veins, dense capillary plexus), while a single Sox17 allele largely restores arterial identity. SoxF gene expression is reduced by loss of Norrin/Frizzled4-mediated Wnt signaling but not by VEGF signaling.","method":"Conditional vascular endothelial-specific gene deletion, retinal whole-mount imaging, molecular marker analysis, genetic interaction with Wnt and VEGF pathway mutants","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — combinatorial conditional KO with defined arteriovenous identity phenotype and pathway placement","pmids":["26630461"],"is_preprint":false},{"year":2016,"finding":"SOX7 directly interacts with RUNX1 and inhibits its transcriptional activity; SOX7 hinders RUNX1 DNA binding and also disrupts the interaction between RUNX1 and its co-factor CBFβ in haemogenic endothelium.","method":"Co-immunoprecipitation, protein-protein interaction assays, single-cell expression profiling, immunofluorescence, functional reporter assays","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP demonstrating direct protein-protein interaction with mechanistic consequence (disruption of RUNX1-CBFβ interaction), multiple orthogonal methods","pmids":["27802172"],"is_preprint":false},{"year":2016,"finding":"PDGF-BB activates SOX7 transcription factor in pericytes, which in turn drives IL-33 expression (the highest upregulated gene); IL-33 promotes metastasis through recruitment of tumour-associated macrophages via the ST2 receptor.","method":"Gain- and loss-of-function experiments in xenograft mouse models, pharmacological and genetic inhibition of IL-33-ST2, gene expression analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain/loss-of-function with defined pathway placement, single lab","pmids":["27150562"],"is_preprint":false},{"year":2016,"finding":"In tumor endothelial cells of high-grade glioma, Sox7 promotes VEGFR2 expression and vascular abnormality; Sox7 deletion suppresses VEGFR2 expression and normalizes vessels, while Sox17 deletion exacerbates this by up-regulating Sox7.","method":"Conditional endothelial Sox7 deletion, Sox17 deletion, anti-VEGFR2 antibody treatment, tumor growth assays, gene expression analysis","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined molecular target (VEGFR2), epistasis between Sox7 and Sox17, therapeutic rescue experiments","pmids":["29444818"],"is_preprint":false},{"year":2016,"finding":"SOX7 inhibits Wnt/beta-catenin transcriptional activity in acute myeloid leukemia cells through direct protein binding to beta-catenin; deletion of the beta-catenin binding site of SOX7 significantly reduces its anti-leukemia effects.","method":"Co-immunoprecipitation, domain deletion mutant functional assay, xenogeneic transplantation, overexpression in leukemia cell lines and primary AML cells","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP plus domain deletion establishing mechanistic requirement, validated in both cell lines and primary AML cells","pmids":["25940713"],"is_preprint":false},{"year":2016,"finding":"In endometrial cancer cells, Sox7 physically interacts with both wild-type and mutant beta-catenin as well as TCF4, and co-localizes with them in the nucleus; Sox7 inhibits TCF/LEF-1-dependent Wnt transcription and suppresses Wnt targets Cyclin D1 and c-Myc.","method":"Co-immunoprecipitation, immunofluorescence co-localization, luciferase reporter assay, Western blot","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus reporter assay plus co-localization, single lab","pmids":["23295859"],"is_preprint":false},{"year":2017,"finding":"SOX7 suppresses Wnt signaling by competing with BCL9 to bind beta-catenin, thereby disrupting the beta-catenin/BCL9 interaction required for oncogenic transcription.","method":"Co-immunoprecipitation, SuperTOPFLASH reporter assay","journal":"DNA and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus reporter assay demonstrating competitive binding mechanism, single lab","pmids":["29271667"],"is_preprint":false},{"year":2017,"finding":"Sox7 binds directly to the promoters of Wnt4 and Bmp2 in the atrioventricular canal; Sox7 deficiency in mice reduces Bmp2 expression in AV canal myocardium and Wnt4 in endocardium, impairing endothelial-to-mesenchymal transition (EndMT) required for atrioventricular cushion development. WNT4 or BMP2 protein partially rescues impaired EndMT caused by Sox7 deficiency.","method":"Conditional Sox7 knockout mice, ChIP (direct binding), transcriptome analysis, rescue experiments with recombinant WNT4/BMP2 protein","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct ChIP binding to target promoters plus in vivo conditional KO plus protein rescue experiments","pmids":["33846290"],"is_preprint":false},{"year":2017,"finding":"GATA4 directly and specifically induces Sox7 (and Sox18) expression during cardiomyogenesis; Gata4 knockdown reduces Sox7/Sox18 expression and the cardiomyocyte differentiation defect can be partially restored by reinstating Sox7 or Sox18.","method":"Genome-wide transcriptomics in Xenopus and mouse ESCs, morpholino/shRNA knockdown, mRNA rescue, RT-PCR","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide approach with functional validation in two species, epistasis by knockdown and rescue","pmids":["29229250"],"is_preprint":false},{"year":2017,"finding":"SOX7 directly binds to the PSMA enhancer (PSME) at SOX box sites #2 and #4 and suppresses PSME-mediated transcription; the nuclear localization signal (NLS) region of SOX7, but not its beta-catenin interacting motif, is essential for this suppressive activity.","method":"ChIP, EMSA, luciferase reporter assay, domain deletion mutants, stable expression in cancer cell lines","journal":"The Prostate","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP plus EMSA demonstrating direct binding, functional validation with domain mutants identifying essential NLS","pmids":["30488457"],"is_preprint":false},{"year":2017,"finding":"SOX7 directly binds to the HBV core promoter (HBVCP) and competitively displaces hepatocyte nuclear factor 4α to inhibit HBVCP transcription; stapled SOX7 HMG-box peptide mimetics recapitulate this inhibition in HBV-infected primary human hepatocytes.","method":"EMSA, luciferase reporter assay, pgRNA/HBcAg/cccDNA measurement, stapled peptide experiments in primary hepatocytes","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 1 / Strong — EMSA demonstrating direct binding plus multiple functional readouts including cccDNA in primary cells","pmids":["28887167"],"is_preprint":false},{"year":2018,"finding":"SOX7 induces cellular apoptosis through upregulation of P38 and apoptotic signaling pathway genes, and prevents proteasome-mediated degradation of pro-apoptotic protein BIM. Proteasome inhibitors or MEK/ERK inhibitors attenuate SOX7-promoted BIM degradation.","method":"Gene expression analysis, pharmacological inhibition (MG132, bortezomib, U0126), Western blot, loss-of-function experiments","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection of pathway plus expression analysis, single lab, mechanistic detail at proteasome level","pmids":["31332289"],"is_preprint":false},{"year":2018,"finding":"SOX7 chromatin immunoprecipitation identifies SPRY1 and SLIT2 as direct SOX7-activated target genes, and TRIB3 and MTHFD2 as SOX7-repressed targets in breast cancer cells; these contribute to SOX7-mediated tumor suppression.","method":"Microarray gene expression profiling, ChIP assay, quantitative PCR validation, correlation with clinical dataset","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — ChIP demonstrating direct binding at target promoters plus transcriptomics, single lab","pmids":["29757932"],"is_preprint":false},{"year":2019,"finding":"SOX7 directly regulates cardiovascular progenitor cell fate by interfering with GATA4 transcriptional activity; protein-protein interaction between SOX7 and GATA4 was demonstrated, and Sox7 modulates WNT and BMP signaling during cardiovascular differentiation. ChIP-Seq and ATAC-Seq defined genome-wide Sox7 target genes in cardiac and endothelial progenitors.","method":"ChIP-Seq, ATAC-Seq, transcriptomics, Co-IP (protein-protein interaction), doxycycline-inducible ES cell system","journal":"Stem cells and development","confidence":"High","confidence_rationale":"Tier 1 / Strong — genome-wide ChIP-Seq plus Co-IP plus transcriptomics in defined progenitor system, multiple orthogonal methods","pmids":["31154937"],"is_preprint":false},{"year":2019,"finding":"In hippocampal neurons, SOX7 overexpression promotes apoptosis by interacting with beta-catenin and suppressing its transcriptional activity (not through protein degradation); beta-catenin inhibition mediates the pro-apoptotic effect of SOX7 in potassium deprivation-induced neuronal apoptosis.","method":"Co-immunoprecipitation, overexpression/knockdown, apoptosis assays, reporter assay","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating interaction plus functional epistasis, single lab","pmids":["25847511"],"is_preprint":false},{"year":2019,"finding":"Sox7 plays a role in antibody-dependent endothelial cell activation via the Jagged1-Notch1 pathway; Sox7 knockdown reduces HLA antibody-induced expression of adhesion molecules and cytokines, and Jagged1 overexpression rescues the inhibitory effects of Sox7 knockdown.","method":"shRNA knockdown, overexpression, in vitro HKGEC model, in vivo kidney transplantation model, Western blot","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo loss-of-function with epistasis (Jagged1 rescue), single lab","pmids":["30639059"],"is_preprint":false},{"year":2017,"finding":"SOX7 is expressed in FLK1-expressing vascular progenitor cells and its deletion causes defective vascular organization from E8.5 onward; conditional deletion of Sox7 in FLK1+ cells leads to widespread vascular defects by E10.5, while VAV-specific Sox7 deletion does not affect haematopoiesis.","method":"Conditional knockout mice (FLK1-Cre and VAV-Cre), embryo phenotyping, immunostaining, endothelial marker analysis","journal":"Mechanisms of development","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with defined vascular phenotype, negative hematopoietic result informative for tissue specificity","pmids":["28577909"],"is_preprint":false},{"year":2020,"finding":"SOX7 depletion in human endothelial cells impairs hypoxia-induced angiogenesis; SOX7 expression is rapidly and transiently induced during hypoxia through HIF-dependent mechanisms, and is an early regulator of the angiogenic transcriptional program.","method":"RNA-Seq, SOX7 siRNA depletion, functional angiogenesis assays, HIF1A/EPAS1 depletion for pathway positioning","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transcriptomics plus functional validation in primary human ECs, single lab","pmids":["32071080"],"is_preprint":false},{"year":2021,"finding":"SOX7 directly up-regulates VE-cadherin by binding to its gene promoter in endothelial cells, thereby suppressing EndMT during outflow tract development. SOX7 mutations found in congenital heart disease patients weaken transactivation of the VE-cadherin promoter.","method":"Luciferase reporter assay, EMSA, collagen gel EndMT assay, overexpression experiments, patient variant functional analysis","journal":"Clinical science","confidence":"High","confidence_rationale":"Tier 1 / Strong — EMSA plus luciferase establishing direct binding and transactivation, functional EndMT assay, validated with patient mutations","pmids":["33720353"],"is_preprint":false},{"year":2022,"finding":"A truncating SOX7 variant (Gln104*) fails to transactivate its target genes GATA4 and BMP2, and also loses the ability to cooperatively transactivate with NKX2.5, establishing GATA4, BMP2, and cooperative NKX2.5 interaction as functionally important targets of SOX7 in cardiac development.","method":"Dual-luciferase reporter assay with wild-type and mutant SOX7, co-transfection with NKX2.5","journal":"American journal of translational research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with patient-derived variant, single lab, two target genes validated","pmids":["35422912"],"is_preprint":false},{"year":2023,"finding":"SOX7 in blood vascular endothelial cells (BECs) directly represses VEGFC transcription by binding to distant regulatory regions of the Vegfc locus, and SOX7 directly binds HEY1, a Notch pathway repressor, suggesting recruitment of HEY1 at Vegfc regulatory regions. Endothelial-specific loss of SOX7 causes dysmorphic dermal lymphatic phenotype through non-cell-autonomous regulation of lymphatic patterning.","method":"Conditional endothelial Sox7 knockout mouse, identification of Vegfc regulatory regions, ChIP/binding assays, Co-IP for SOX7-HEY1 interaction","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct regulatory region identification, SOX7-HEY1 protein interaction, in vivo conditional KO, non-cell-autonomous mechanism established","pmids":["36715213"],"is_preprint":false},{"year":2023,"finding":"Endothelial-specific loss of Sox7 in mice causes ventricular non-compaction cardiomyopathy with abnormal coronary artery formation; Sox7 maintains cardiac endothelial identity by regulating the Notch pathway and connexins 37 and 40 for coronary arterial specification. Sox7-null endothelial cells transdifferentiate into hematopoietic lineages; single-nuclei transcriptomics identifies depletion of Sox9/Gpc3-positive endocardial progenitors.","method":"Endothelial-specific conditional KO, single-nuclei transcriptomics, fate mapping, histology","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined phenotype, pathway analysis via single-nuclei transcriptomics, fate mapping","pmids":["37551717"],"is_preprint":false},{"year":2024,"finding":"SOX7 binds to the promoter of DNMT3B and transcriptionally inhibits DNMT3B expression, resulting in reduced methylation of the CYGB promoter and inhibiting bladder cancer progression.","method":"ChIP assay (SOX7 binding to DNMT3B promoter), bisulfite sequencing (CYGB methylation), overexpression/knockdown, in vivo tumor models","journal":"Molecular biomedicine","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — ChIP demonstrating direct binding plus methylation analysis, single lab","pmids":["39227479"],"is_preprint":false},{"year":2016,"finding":"In hepatocellular carcinoma cells, Sox7 physically binds with beta-catenin and TCF4 in the nucleus and inhibits the activity of Wnt/beta-catenin signaling pathway; miR-452 promotes stem-like characteristics by directly targeting Sox7.","method":"Co-immunoprecipitation, luciferase reporter assay, in vitro and in vivo stem-like cell assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus reporter assay, single lab","pmids":["27058905"],"is_preprint":false},{"year":2018,"finding":"Sox7 knockdown in primary myoblasts causes impaired myoblast fusion and increased sensitivity to apoptosis; conditional Sox7 knockout in PAX3+ cells in vivo reduces the satellite cell population from birth, reduces myofiber caliber, and impairs muscle regeneration after injury.","method":"Conditional knockout mouse (PAX3-Cre), shRNA knockdown in primary myoblasts, ES cell differentiation, in vivo injury model","journal":"Stem cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined regeneration phenotype plus in vitro mechanistic follow-up, multiple approaches","pmids":["28943254"],"is_preprint":false},{"year":2024,"finding":"SOX7 attenuates hepatic stellate cell (HSC) activation and liver fibrosis by decreasing beta-catenin expression and reducing TGF-β1-induced phosphorylation of Smad2 and Smad3; AAV8-SOX7 overexpression in mice ameliorates CCl4-induced liver fibrosis in vivo.","method":"AAV8-mediated overexpression in mouse fibrosis model, siRNA knockdown, Western blot, in vivo CCl4 model","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo AAV gain-of-function with defined pathway (Smad2/3, beta-catenin), single lab","pmids":["39126242"],"is_preprint":false},{"year":2011,"finding":"SOX7 is upregulated by aspirin in colorectal cancer cells via the p38MAPK pathway; AP1 transcription factors c-Jun and c-Fos upregulate SOX7 promoter activity, and SOX7 mediates aspirin-induced growth inhibition.","method":"Luciferase reporter assay, p38MAPK inhibition (SB203580), RT-PCR, Western blot, MTT assay","journal":"World journal of gastroenterology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter assay plus pharmacological epistasis, single lab","pmids":["22171135"],"is_preprint":false}],"current_model":"SOX7 is a SoxF-family HMG-box transcription factor that directly binds DNA at SOX consensus sites (validated by EMSA and ChIP) to activate target genes including VE-cadherin, Fgf-3, Lama1, VEGFC-repressive elements, Wnt4, Bmp2, SPRY1, SLIT2, and GATA4/BMP2, while also functioning through protein-protein interactions with beta-catenin (disrupting its TCF/BCL9 co-activator complexes), RUNX1 (inhibiting its DNA binding and CBFβ interaction), GATA4, and HEY1 to suppress Wnt/beta-catenin and promote or restrain endothelial, hematopoietic, and cardiac cell fate decisions; in vascular development, SOX7 acts redundantly with SOX17/SOX18 to specify arteriovenous identity upstream of Notch/Gridlock and non-cell-autonomously patterns lymphatic vessels by repressing VEGFC transcription, while in cancer contexts SOX7 is frequently silenced by promoter hypermethylation and acts as a tumor suppressor through beta-catenin inhibition and MAPK/ERK-BIM-mediated apoptosis regulation."},"narrative":{"mechanistic_narrative":"SOX7 is an HMG-box transcription factor that orchestrates vascular, cardiac, hematopoietic, and endodermal cell-fate decisions through both sequence-specific DNA binding and protein-protein interactions [PMID:15220343, PMID:18094332, PMID:27802172]. Through its HMG box it binds SOX consensus sites in target enhancers and promoters to activate transcription of laminin alpha1 in parietal endoderm [PMID:15220343], Fgf-3 (where it competes with GATA-4) [PMID:15082719], VE-cadherin in haemogenic and outflow-tract endothelium [PMID:22492353, PMID:33720353], and Wnt4/Bmp2 in the atrioventricular canal [PMID:33846290], while repressing other targets including a VEGFC regulatory locus, DNMT3B, and the proteasome-subunit PSME enhancer [PMID:36715213, PMID:39227479, PMID:30488457]. In vascular development SOX7 acts redundantly with SOX17 and SOX18 to specify arteriovenous identity, functioning upstream of Notch/Gridlock(Hey2) and EphrinB2, with loss producing arteriovenous shunts and ectopic venous Flt4 expression [PMID:18094332, PMID:18377889, PMID:25834021, PMID:26630461]; its own expression is driven by ETV2 and HIF during endothelial specification and hypoxic angiogenesis [PMID:24762086, PMID:32071080]. SOX7 also restrains hematopoietic commitment from endothelium by directly inhibiting RUNX1 DNA binding and disrupting the RUNX1-CBFβ interaction [PMID:27802172], and sustains endothelial over hematopoietic identity in coronary and endocardial development [PMID:37551717]. A second mode of action is direct binding to β-catenin, by which SOX7 depletes active β-catenin and competes with BCL9 and TCF4 to suppress Wnt/β-catenin transcription—a mechanism underlying its tumor-suppressive and pro-apoptotic roles, frequently lost through promoter hypermethylation in cancer [PMID:18819930, PMID:25940713, PMID:29271667, PMID:23295859]. SOX7 cooperates with cardiac factors GATA4 and NKX2.5, and is induced by GATA4, to regulate cardiomyocyte and cardiovascular progenitor differentiation [PMID:29229250, PMID:31154937, PMID:35422912]. Haploinsufficiency causes diaphragmatic hernia and homozygous loss causes cardiovascular failure in mice, and SOX7 mutations are found in congenital heart disease patients where they weaken transactivation of cardiac targets [PMID:22723016, PMID:33720353, PMID:35422912].","teleology":[{"year":2001,"claim":"Established that SOX7 is a transcriptional activator that can antagonize Wnt/β-catenin signaling, defining its dual activator/repressor logic.","evidence":"Transactivation domain mapping and TCF/LEF reporter assays in cultured cells","pmids":["11691915"],"confidence":"Medium","gaps":["No direct DNA targets identified","Mechanism of β-catenin antagonism not defined at this stage"]},{"year":2004,"claim":"Identified the first direct SOX7 DNA targets and an endodermal program, showing HMG-box-dependent activation of Lama1 and Fgf-3 and placement upstream of GATA-4/6.","evidence":"EMSA, luciferase reporter mutagenesis, siRNA knockdown and rescue in F9 embryonal carcinoma/embryoid body systems","pmids":["15220343","15082719","15542856"],"confidence":"High","gaps":["Restricted to F9/embryoid-body context","Genome-wide target repertoire unknown"]},{"year":2005,"claim":"Demonstrated functional redundancy with SOX18 in cardiogenesis and showed β-catenin interaction is dispensable for this developmental activity, separating DNA-binding from protein-interaction modes.","evidence":"mRNA injection, morpholino knockdown, reciprocal rescue, and domain-swap experiments in Xenopus","pmids":["16193513"],"confidence":"High","gaps":["Direct cardiac target genes not identified here","Relationship to mammalian heart development untested"]},{"year":2008,"claim":"Defined the redundant SoxF role in arteriovenous identity, placing sox7/sox18 upstream of Gridlock/Hey2 and arterial markers.","evidence":"Combinatorial morpholino knockdown with arteriovenous marker in situ hybridization in zebrafish","pmids":["18094332","18377889"],"confidence":"High","gaps":["Direct vs indirect regulation of Hey2/EphrinB2 not resolved","Relative contribution of each SoxF gene unclear"]},{"year":2008,"claim":"Established the molecular basis of SOX7 Wnt antagonism in cancer—direct β-catenin binding and depletion—and linked promoter hypermethylation to its silencing as a tumor suppressor.","evidence":"Co-IP, luciferase reporter, bisulfite sequencing in prostate and colorectal cancer cells","pmids":["18819930"],"confidence":"Medium","gaps":["Single-lab Co-IP","Whether DNA binding is required for tumor suppression not addressed here"]},{"year":2009,"claim":"Showed SOX7 restrains hematopoietic differentiation, maintaining multipotent self-renewing precursors during ES cell differentiation.","evidence":"Inducible Sox7 overexpression in ES cell differentiation with flow cytometry and colony assays","pmids":["19801444"],"confidence":"Medium","gaps":["Direct transcriptional targets mediating the block not defined","Single gain-of-function system"]},{"year":2012,"claim":"Connected the endothelial/hematopoietic switch to a direct target, showing SOX7 binds and activates the VE-cadherin promoter and sustains endothelial identity in haemogenic endothelium; in vivo loss causes cardiovascular failure and diaphragmatic hernia.","evidence":"ChIP, luciferase reporter, ES cell gain-of-function; targeted Sox7 deletion mouse phenotyping","pmids":["22492353","22723016"],"confidence":"High","gaps":["Mechanism linking endothelial maintenance to blood differentiation block not fully defined","Diaphragmatic hernia mechanism unresolved"]},{"year":2014,"claim":"Positioned SOX7 within the endothelial specification cascade as a direct ETV2 target mediating endothelial progenitor expansion.","evidence":"ChIP, reporter assay, shRNA knockdown and rescue in embryoid body differentiation","pmids":["24762086"],"confidence":"High","gaps":["Downstream SOX7 effectors in this context not enumerated"]},{"year":2015,"claim":"Refined the arteriovenous mechanism by placing Sox7 genetically upstream of Notch and establishing reciprocal SoxF cross-regulation and Wnt-dependent SoxF expression.","evidence":"Zebrafish sox7 mutant epistasis with NICD rescue; mouse retina combinatorial conditional KO with Wnt/VEGF pathway interactions","pmids":["25834021","26630461"],"confidence":"High","gaps":["Direct Notch-pathway target promoters of SOX7 not identified here","How Wnt signaling controls SoxF transcription unresolved"]},{"year":2016,"claim":"Defined a key protein-interaction mechanism in hematopoiesis: SOX7 directly inhibits RUNX1 by blocking its DNA binding and disrupting the RUNX1-CBFβ complex.","evidence":"Reciprocal Co-IP, single-cell expression, reporter assays in haemogenic endothelium","pmids":["27802172"],"confidence":"High","gaps":["Structural basis of the SOX7-RUNX1 interaction unknown","In vivo requirement for this interaction not isolated"]},{"year":2016,"claim":"Detailed the β-catenin antagonism mechanism across tumor types—competition with BCL9 and binding to β-catenin/TCF4—and validated its requirement via domain deletion in AML.","evidence":"Co-IP, domain deletion functional assays, reporter assays, xenotransplantation in leukemia, endometrial, and hepatocellular cancer cells","pmids":["25940713","29271667","23295859","27058905"],"confidence":"High","gaps":["Most evidence from single-lab Co-IP per context","Relative contribution of DNA binding vs β-catenin sequestration not quantified"]},{"year":2016,"claim":"Revealed context-dependent pro-tumor vascular functions, with SOX7 driving VEGFR2 and pericyte IL-33 to promote vascular abnormality and metastasis, contrasting its tumor-suppressor role.","evidence":"Conditional endothelial Sox7 deletion and xenograft gain/loss-of-function with pathway inhibition","pmids":["29444818","27150562"],"confidence":"High","gaps":["Reconciliation of pro- vs anti-tumor roles by tissue context incomplete","Direct vs indirect VEGFR2 regulation not fully shown"]},{"year":2017,"claim":"Expanded the direct cardiac target set and cofactor network—SOX7 binds Wnt4/Bmp2 promoters to drive EndMT, cooperates with GATA4 and NKX2.5, and is itself induced by GATA4.","evidence":"Conditional KO mice, ChIP, protein rescue, ChIP-Seq/ATAC-Seq, Co-IP, cross-species knockdown/rescue, patient-variant reporter assays","pmids":["33846290","29229250","31154937","35422912"],"confidence":"High","gaps":["Precise cooperativity mechanism with NKX2.5 not structurally defined","Genome-wide direct vs indirect targets partially resolved"]},{"year":2017,"claim":"Showed SOX7 represses an additional direct target (PSME) via SOX-box sites and demonstrated its nuclear localization signal, not the β-catenin motif, is essential for this repression—dissociating repression from Wnt antagonism.","evidence":"ChIP, EMSA, reporter assays with domain-deletion mutants in cancer cell lines","pmids":["30488457"],"confidence":"High","gaps":["Generalizability of NLS-dependent repression to other targets untested"]},{"year":2017,"claim":"Defined the tissue-specific in vivo requirement for SOX7 in vascular progenitors and confirmed it is dispensable in committed hematopoietic cells.","evidence":"FLK1-Cre and VAV-Cre conditional knockout mouse embryo phenotyping","pmids":["28577909"],"confidence":"High","gaps":["Direct effectors of vascular organization defect not identified here"]},{"year":2018,"claim":"Broadened the target landscape and effector mechanism in cancer, identifying direct activated (SPRY1, SLIT2) and repressed (TRIB3, MTHFD2) targets and a pro-apoptotic pathway stabilizing BIM via MEK/ERK and the proteasome.","evidence":"ChIP and microarray profiling in breast cancer; pharmacological pathway dissection of P38/MEK-ERK-BIM","pmids":["29757932","31332289"],"confidence":"Medium","gaps":["Single-lab ChIP per target","Direct vs indirect control of BIM stability not fully resolved"]},{"year":2018,"claim":"Extended SOX7 function beyond vasculature to skeletal muscle, where it maintains satellite cells and supports myoblast fusion and regeneration.","evidence":"PAX3-Cre conditional KO mice, shRNA knockdown in primary myoblasts, in vivo injury model","pmids":["28943254"],"confidence":"High","gaps":["Transcriptional targets in muscle stem cells not identified"]},{"year":2019,"claim":"Linked SOX7 to neuronal apoptosis and antibody-mediated endothelial activation, expanding its β-catenin and Notch (Jagged1) regulatory roles.","evidence":"Co-IP and apoptosis assays in hippocampal neurons; shRNA and Jagged1 rescue in endothelial transplant models","pmids":["25847511","30639059"],"confidence":"Medium","gaps":["Single-lab studies","Direct vs indirect Jagged1/Notch regulation not established"]},{"year":2020,"claim":"Positioned SOX7 as an early HIF-dependent effector of hypoxia-driven angiogenesis in human endothelial cells.","evidence":"RNA-Seq, siRNA depletion, angiogenesis assays, HIF1A/EPAS1 depletion in primary human ECs","pmids":["32071080"],"confidence":"Medium","gaps":["Direct HIF binding to SOX7 locus not shown","Single lab"]},{"year":2021,"claim":"Tied SOX7 directly to human congenital heart disease by showing patient mutations weaken VE-cadherin transactivation and impair EndMT during outflow-tract development.","evidence":"EMSA, luciferase, collagen-gel EndMT assay, patient variant functional analysis","pmids":["33720353"],"confidence":"High","gaps":["Causality of patient variants in vivo not formally established"]},{"year":2023,"claim":"Established SOX7 as a non-cell-autonomous repressor of lymphatic patterning via direct VEGFC repression and a SOX7-HEY1 interaction, and as a maintainer of cardiac endothelial identity preventing endothelial-to-hematopoietic transdifferentiation.","evidence":"Endothelial conditional KO mice, regulatory-region binding assays, Co-IP for SOX7-HEY1, single-nuclei transcriptomics and fate mapping","pmids":["36715213","37551717"],"confidence":"High","gaps":["Whether HEY1 recruitment to Vegfc regulatory regions is direct not fully proven","Mechanism of endothelial-to-hematopoietic transdifferentiation upon Sox7 loss incomplete"]},{"year":2024,"claim":"Added an epigenetic effector arm, showing SOX7 represses DNMT3B to lower CYGB promoter methylation and suppress bladder cancer, and attenuates liver fibrosis through β-catenin and TGF-β/Smad pathways.","evidence":"ChIP, bisulfite sequencing, in vivo tumor models; AAV8-SOX7 overexpression in CCl4 fibrosis model","pmids":["39227479","39126242"],"confidence":"Medium","gaps":["Single-lab findings","Direct vs indirect Smad regulation not established"]},{"year":null,"claim":"How the relative use of direct DNA binding versus β-catenin/RUNX1/HEY1 protein-interaction modes is selected across tissues, and what determines SOX7's context-dependent switch between tumor-suppressive and pro-angiogenic/pro-metastatic roles, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of SOX7 cofactor complexes","Determinants of activator vs repressor output at individual loci unknown","Integrated logic across vascular, cardiac, hematopoietic, and cancer contexts not unified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,2,10,21,23,24,32,34,36]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,2,10,21,27,32,34]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[7,15,18,20,34]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[19,23,37]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,6,11,21,22,30,32,35]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,18,20,34,13]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,2,10,23,26,36]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[7,16,17,18,24,36]}],"complexes":[],"partners":["CTNNB1","RUNX1","GATA4","HEY1","TCF4","BCL9","NKX2.5","CBFB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BT81","full_name":"Transcription factor SOX-7","aliases":[],"length_aa":388,"mass_kda":42.2,"function":"Binds to and activates the CDH5 promoter, hence plays a role in the transcriptional regulation of genes expressed in the hemogenic endothelium and blocks further differentiation into blood precursors (By similarity). May be required for the survival of both hematopoietic and endothelial precursors during specification (By similarity). Competes with GATA4 for binding and activation of the FGF3 promoter (By similarity). Represses Wnt/beta-catenin-stimulated transcription, probably by targeting CTNNB1 to proteasomal degradation. Binds the DNA sequence 5'-AACAAT-3'","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9BT81/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SOX7","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SOX7","total_profiled":1310},"omim":[{"mim_id":"621248","title":"PULMONARY HYPERTENSION, PRIMARY, 7; PPH7","url":"https://www.omim.org/entry/621248"},{"mim_id":"612202","title":"SRY-BOX 7; SOX7","url":"https://www.omim.org/entry/612202"},{"mim_id":"610928","title":"SRY-BOX 17; SOX17","url":"https://www.omim.org/entry/610928"},{"mim_id":"608581","title":"RP1-LIKE PROTEIN 1; RP1L1","url":"https://www.omim.org/entry/608581"},{"mim_id":"222400","title":"DIAPHRAGMATIC HERNIA 2; DIH2","url":"https://www.omim.org/entry/222400"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear speckles","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"vagina","ntpm":40.8}],"url":"https://www.proteinatlas.org/search/SOX7"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9BT81","domains":[{"cath_id":"1.10.30.10","chopping":"52-109","consensus_level":"high","plddt":97.8426,"start":52,"end":109}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BT81","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BT81-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BT81-F1-predicted_aligned_error_v6.png","plddt_mean":59.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SOX7","jax_strain_url":"https://www.jax.org/strain/search?query=SOX7"},"sequence":{"accession":"Q9BT81","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BT81.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BT81/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BT81"}},"corpus_meta":[{"pmid":"18094332","id":"PMC_18094332","title":"Sox18 and Sox7 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\"confidence_rationale\": \"Tier 2 / Moderate — functional reporter assays with domain analysis, single lab, two orthogonal approaches\",\n      \"pmids\": [\"11691915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SOX7 and SOX17 bind specifically to two SOX-binding sites within the laminin alpha1 (Lama1) parietal endoderm-specific enhancer and trans-activate Lama1 transcription in F9 cells; this activation is HMG-box-dependent and synergistic with Sp1/Sp3 and NF-Y binding sites upstream.\",\n      \"method\": \"EMSA, luciferase reporter assay, mutational analysis, Northern blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding (EMSA), reporter assay with mutational validation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"15220343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SOX7 competes with GATA-4 for occupancy of the PS4A element in the Fgf-3 promoter and acts as a potent activator of Fgf-3 transcription; RNAi knockdown of Sox7 in GATA-4-deficient embryoid bodies virtually abolishes Fgf-3 expression.\",\n      \"method\": \"Luciferase reporter assay, EMSA, siRNA knockdown, in situ hybridization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — EMSA demonstrating competitive binding, reporter assay, and RNAi functional validation; multiple orthogonal methods\",\n      \"pmids\": [\"15082719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In F9 embryonal carcinoma cells, Sox7 acts upstream of Gata-4 and Gata-6 to regulate parietal endoderm differentiation; siRNA silencing of Sox7 blocks induction of Gata-4 and Gata-6 by retinoic acid/cAMP, while overexpression of Gata-4 or Gata-6 in Sox7-silenced cells restores differentiation.\",\n      \"method\": \"siRNA knockdown, overexpression, morphological analysis, Western blot, RT-PCR\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis established by loss-of-function and rescue experiments with multiple markers, replicated across conditions\",\n      \"pmids\": [\"15542856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In Xenopus, SOX7 and SOX18 function redundantly to induce cardiogenesis through Xnr2 (nodal) signaling; SOX7 RNA rescues the SOX18 morpholino phenotype and vice versa. Versions of SOX7 with the C-terminal beta-catenin interaction domain replaced by a transcriptional activator still induce cardiogenesis, indicating beta-catenin interaction is dispensable for this activity.\",\n      \"method\": \"mRNA injection, morpholino knockdown, animal cap explant assay, marker gene expression\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal rescue experiments, domain deletion analysis, multiple functional readouts\",\n      \"pmids\": [\"16193513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In zebrafish, sox7 and sox18 play redundant but collectively essential roles in establishing arteriovenous identity; simultaneous morpholino knockdown of both genes causes arteriovenous fusions with failure of venous endothelial cell differentiation while endothelial specification is maintained.\",\n      \"method\": \"Morpholino knockdown, transgenic line imaging, in situ hybridization with arteriovenous markers\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — combinatorial loss-of-function with defined molecular phenotype, multiple marker validation, replicated across two labs (see PMID:18377889)\",\n      \"pmids\": [\"18094332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Zebrafish Sox7 and Sox18 control arterial-venous identity by regulating Gridlock (Hey2) expression; double morphants display ectopic venous marker Flt4 in the dorsal aorta and loss of artery-specific markers EphrinB2a and Gridlock.\",\n      \"method\": \"Morpholino knockdown, in situ hybridization, gene expression analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — defined epistatic relationship with Gridlock, multiple molecular markers, independent replication\",\n      \"pmids\": [\"18377889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SOX7 protein physically interacts with beta-catenin and suppresses beta-catenin-mediated transcription by depleting active beta-catenin; promoter hypermethylation silences SOX7 in prostate and colorectal cancers.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter assay, bisulfite sequencing, ectopic expression\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus reporter assay, single lab\",\n      \"pmids\": [\"18819930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SOX7 and SOX17 can functionally substitute for SOX18 during lymphatic development in a strain-specific compensatory mechanism; they are activated specifically in the absence of SOX18 function in permissive strains.\",\n      \"method\": \"Genetic mouse model, conditional deletion, in vitro and in vivo functional substitution assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic complementation with defined molecular mechanism, multiple strains tested\",\n      \"pmids\": [\"19515696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Sustained Sox7 expression in the earliest committed hematopoietic precursors (during ES cell differentiation) promotes maintenance of multipotent self-renewing status and blocks differentiation; removal of the Sox7 block leads to efficient erythroid and myeloid differentiation.\",\n      \"method\": \"Inducible Sox7 overexpression in ES cell differentiation system, flow cytometry, colony assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inducible gain-of-function with defined cellular phenotype, single lab\",\n      \"pmids\": [\"19801444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SOX7 binds and activates the VE-cadherin promoter in haemogenic endothelium; enforced SOX7 expression in haemangioblast-derived blast colonies blocks blood cell differentiation and sustains endothelial marker expression.\",\n      \"method\": \"Chromatin immunoprecipitation, luciferase reporter assay, ES cell differentiation gain-of-function\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP demonstrating direct promoter binding plus reporter assay and functional gain-of-function in defined progenitor system\",\n      \"pmids\": [\"22492353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Haploinsufficiency of Sox7 in mice causes anterior retrosternal diaphragmatic hernias; homozygous Sox7 null embryos die with cardiovascular failure. SOX7 is expressed in vascular endothelial cells of the developing diaphragm.\",\n      \"method\": \"Targeted gene deletion (Sox7 exon 2 deletion), immunohistochemistry, mouse phenotyping\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — defined loss-of-function mouse model with specific phenotypic readout and localization data\",\n      \"pmids\": [\"22723016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ETV2 directly binds to ETV2 binding elements in the Sox7 upstream regulatory region and activates Sox7 transcription; Sox7 overexpression mimics ETV2 in promoting endothelial progenitor expansion, and Sox7 knockdown blocks ETV2-induced endothelial progenitor formation and angiogenic sprouting.\",\n      \"method\": \"ChIP, luciferase reporter assay, shRNA knockdown, embryoid body differentiation assay\",\n      \"journal\": \"Stem cells and development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP demonstrating direct binding plus reporter assay and epistasis by knockdown rescue experiments\",\n      \"pmids\": [\"24762086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In zebrafish, sox7 mutants display arteriovenous shunt formation at specific arterial sites due to ectopic flt4 expression; genetic interaction experiments place Sox7 upstream of Notch (overexpression of Notch intracellular domain rescues sox7 mutant phenotype), and Sox7 interacts genetically with hey2 and efnb2 in arterial specification.\",\n      \"method\": \"Zebrafish sox7 mutant generation, in vivo imaging, in situ hybridization, genetic epistasis (NICD overexpression rescue), combinatorial mutant analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — defined mutant model with epistasis experiments placing Sox7 upstream of Notch; multiple orthogonal approaches\",\n      \"pmids\": [\"25834021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In the mouse retina, Sox7 and Sox17 reciprocally regulate each other's expression; combined deletion of Sox7, Sox17, and Sox18 causes loss of arterial identity (loss of radial arteries/veins, dense capillary plexus), while a single Sox17 allele largely restores arterial identity. SoxF gene expression is reduced by loss of Norrin/Frizzled4-mediated Wnt signaling but not by VEGF signaling.\",\n      \"method\": \"Conditional vascular endothelial-specific gene deletion, retinal whole-mount imaging, molecular marker analysis, genetic interaction with Wnt and VEGF pathway mutants\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — combinatorial conditional KO with defined arteriovenous identity phenotype and pathway placement\",\n      \"pmids\": [\"26630461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SOX7 directly interacts with RUNX1 and inhibits its transcriptional activity; SOX7 hinders RUNX1 DNA binding and also disrupts the interaction between RUNX1 and its co-factor CBFβ in haemogenic endothelium.\",\n      \"method\": \"Co-immunoprecipitation, protein-protein interaction assays, single-cell expression profiling, immunofluorescence, functional reporter assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP demonstrating direct protein-protein interaction with mechanistic consequence (disruption of RUNX1-CBFβ interaction), multiple orthogonal methods\",\n      \"pmids\": [\"27802172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PDGF-BB activates SOX7 transcription factor in pericytes, which in turn drives IL-33 expression (the highest upregulated gene); IL-33 promotes metastasis through recruitment of tumour-associated macrophages via the ST2 receptor.\",\n      \"method\": \"Gain- and loss-of-function experiments in xenograft mouse models, pharmacological and genetic inhibition of IL-33-ST2, gene expression analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain/loss-of-function with defined pathway placement, single lab\",\n      \"pmids\": [\"27150562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In tumor endothelial cells of high-grade glioma, Sox7 promotes VEGFR2 expression and vascular abnormality; Sox7 deletion suppresses VEGFR2 expression and normalizes vessels, while Sox17 deletion exacerbates this by up-regulating Sox7.\",\n      \"method\": \"Conditional endothelial Sox7 deletion, Sox17 deletion, anti-VEGFR2 antibody treatment, tumor growth assays, gene expression analysis\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined molecular target (VEGFR2), epistasis between Sox7 and Sox17, therapeutic rescue experiments\",\n      \"pmids\": [\"29444818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SOX7 inhibits Wnt/beta-catenin transcriptional activity in acute myeloid leukemia cells through direct protein binding to beta-catenin; deletion of the beta-catenin binding site of SOX7 significantly reduces its anti-leukemia effects.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion mutant functional assay, xenogeneic transplantation, overexpression in leukemia cell lines and primary AML cells\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP plus domain deletion establishing mechanistic requirement, validated in both cell lines and primary AML cells\",\n      \"pmids\": [\"25940713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In endometrial cancer cells, Sox7 physically interacts with both wild-type and mutant beta-catenin as well as TCF4, and co-localizes with them in the nucleus; Sox7 inhibits TCF/LEF-1-dependent Wnt transcription and suppresses Wnt targets Cyclin D1 and c-Myc.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, luciferase reporter assay, Western blot\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus reporter assay plus co-localization, single lab\",\n      \"pmids\": [\"23295859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX7 suppresses Wnt signaling by competing with BCL9 to bind beta-catenin, thereby disrupting the beta-catenin/BCL9 interaction required for oncogenic transcription.\",\n      \"method\": \"Co-immunoprecipitation, SuperTOPFLASH reporter assay\",\n      \"journal\": \"DNA and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus reporter assay demonstrating competitive binding mechanism, single lab\",\n      \"pmids\": [\"29271667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sox7 binds directly to the promoters of Wnt4 and Bmp2 in the atrioventricular canal; Sox7 deficiency in mice reduces Bmp2 expression in AV canal myocardium and Wnt4 in endocardium, impairing endothelial-to-mesenchymal transition (EndMT) required for atrioventricular cushion development. WNT4 or BMP2 protein partially rescues impaired EndMT caused by Sox7 deficiency.\",\n      \"method\": \"Conditional Sox7 knockout mice, ChIP (direct binding), transcriptome analysis, rescue experiments with recombinant WNT4/BMP2 protein\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct ChIP binding to target promoters plus in vivo conditional KO plus protein rescue experiments\",\n      \"pmids\": [\"33846290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GATA4 directly and specifically induces Sox7 (and Sox18) expression during cardiomyogenesis; Gata4 knockdown reduces Sox7/Sox18 expression and the cardiomyocyte differentiation defect can be partially restored by reinstating Sox7 or Sox18.\",\n      \"method\": \"Genome-wide transcriptomics in Xenopus and mouse ESCs, morpholino/shRNA knockdown, mRNA rescue, RT-PCR\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide approach with functional validation in two species, epistasis by knockdown and rescue\",\n      \"pmids\": [\"29229250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX7 directly binds to the PSMA enhancer (PSME) at SOX box sites #2 and #4 and suppresses PSME-mediated transcription; the nuclear localization signal (NLS) region of SOX7, but not its beta-catenin interacting motif, is essential for this suppressive activity.\",\n      \"method\": \"ChIP, EMSA, luciferase reporter assay, domain deletion mutants, stable expression in cancer cell lines\",\n      \"journal\": \"The Prostate\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP plus EMSA demonstrating direct binding, functional validation with domain mutants identifying essential NLS\",\n      \"pmids\": [\"30488457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX7 directly binds to the HBV core promoter (HBVCP) and competitively displaces hepatocyte nuclear factor 4α to inhibit HBVCP transcription; stapled SOX7 HMG-box peptide mimetics recapitulate this inhibition in HBV-infected primary human hepatocytes.\",\n      \"method\": \"EMSA, luciferase reporter assay, pgRNA/HBcAg/cccDNA measurement, stapled peptide experiments in primary hepatocytes\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — EMSA demonstrating direct binding plus multiple functional readouts including cccDNA in primary cells\",\n      \"pmids\": [\"28887167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SOX7 induces cellular apoptosis through upregulation of P38 and apoptotic signaling pathway genes, and prevents proteasome-mediated degradation of pro-apoptotic protein BIM. Proteasome inhibitors or MEK/ERK inhibitors attenuate SOX7-promoted BIM degradation.\",\n      \"method\": \"Gene expression analysis, pharmacological inhibition (MG132, bortezomib, U0126), Western blot, loss-of-function experiments\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection of pathway plus expression analysis, single lab, mechanistic detail at proteasome level\",\n      \"pmids\": [\"31332289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SOX7 chromatin immunoprecipitation identifies SPRY1 and SLIT2 as direct SOX7-activated target genes, and TRIB3 and MTHFD2 as SOX7-repressed targets in breast cancer cells; these contribute to SOX7-mediated tumor suppression.\",\n      \"method\": \"Microarray gene expression profiling, ChIP assay, quantitative PCR validation, correlation with clinical dataset\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP demonstrating direct binding at target promoters plus transcriptomics, single lab\",\n      \"pmids\": [\"29757932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SOX7 directly regulates cardiovascular progenitor cell fate by interfering with GATA4 transcriptional activity; protein-protein interaction between SOX7 and GATA4 was demonstrated, and Sox7 modulates WNT and BMP signaling during cardiovascular differentiation. ChIP-Seq and ATAC-Seq defined genome-wide Sox7 target genes in cardiac and endothelial progenitors.\",\n      \"method\": \"ChIP-Seq, ATAC-Seq, transcriptomics, Co-IP (protein-protein interaction), doxycycline-inducible ES cell system\",\n      \"journal\": \"Stem cells and development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genome-wide ChIP-Seq plus Co-IP plus transcriptomics in defined progenitor system, multiple orthogonal methods\",\n      \"pmids\": [\"31154937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In hippocampal neurons, SOX7 overexpression promotes apoptosis by interacting with beta-catenin and suppressing its transcriptional activity (not through protein degradation); beta-catenin inhibition mediates the pro-apoptotic effect of SOX7 in potassium deprivation-induced neuronal apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, overexpression/knockdown, apoptosis assays, reporter assay\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating interaction plus functional epistasis, single lab\",\n      \"pmids\": [\"25847511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sox7 plays a role in antibody-dependent endothelial cell activation via the Jagged1-Notch1 pathway; Sox7 knockdown reduces HLA antibody-induced expression of adhesion molecules and cytokines, and Jagged1 overexpression rescues the inhibitory effects of Sox7 knockdown.\",\n      \"method\": \"shRNA knockdown, overexpression, in vitro HKGEC model, in vivo kidney transplantation model, Western blot\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo loss-of-function with epistasis (Jagged1 rescue), single lab\",\n      \"pmids\": [\"30639059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX7 is expressed in FLK1-expressing vascular progenitor cells and its deletion causes defective vascular organization from E8.5 onward; conditional deletion of Sox7 in FLK1+ cells leads to widespread vascular defects by E10.5, while VAV-specific Sox7 deletion does not affect haematopoiesis.\",\n      \"method\": \"Conditional knockout mice (FLK1-Cre and VAV-Cre), embryo phenotyping, immunostaining, endothelial marker analysis\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with defined vascular phenotype, negative hematopoietic result informative for tissue specificity\",\n      \"pmids\": [\"28577909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SOX7 depletion in human endothelial cells impairs hypoxia-induced angiogenesis; SOX7 expression is rapidly and transiently induced during hypoxia through HIF-dependent mechanisms, and is an early regulator of the angiogenic transcriptional program.\",\n      \"method\": \"RNA-Seq, SOX7 siRNA depletion, functional angiogenesis assays, HIF1A/EPAS1 depletion for pathway positioning\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transcriptomics plus functional validation in primary human ECs, single lab\",\n      \"pmids\": [\"32071080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SOX7 directly up-regulates VE-cadherin by binding to its gene promoter in endothelial cells, thereby suppressing EndMT during outflow tract development. SOX7 mutations found in congenital heart disease patients weaken transactivation of the VE-cadherin promoter.\",\n      \"method\": \"Luciferase reporter assay, EMSA, collagen gel EndMT assay, overexpression experiments, patient variant functional analysis\",\n      \"journal\": \"Clinical science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — EMSA plus luciferase establishing direct binding and transactivation, functional EndMT assay, validated with patient mutations\",\n      \"pmids\": [\"33720353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A truncating SOX7 variant (Gln104*) fails to transactivate its target genes GATA4 and BMP2, and also loses the ability to cooperatively transactivate with NKX2.5, establishing GATA4, BMP2, and cooperative NKX2.5 interaction as functionally important targets of SOX7 in cardiac development.\",\n      \"method\": \"Dual-luciferase reporter assay with wild-type and mutant SOX7, co-transfection with NKX2.5\",\n      \"journal\": \"American journal of translational research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with patient-derived variant, single lab, two target genes validated\",\n      \"pmids\": [\"35422912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SOX7 in blood vascular endothelial cells (BECs) directly represses VEGFC transcription by binding to distant regulatory regions of the Vegfc locus, and SOX7 directly binds HEY1, a Notch pathway repressor, suggesting recruitment of HEY1 at Vegfc regulatory regions. Endothelial-specific loss of SOX7 causes dysmorphic dermal lymphatic phenotype through non-cell-autonomous regulation of lymphatic patterning.\",\n      \"method\": \"Conditional endothelial Sox7 knockout mouse, identification of Vegfc regulatory regions, ChIP/binding assays, Co-IP for SOX7-HEY1 interaction\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct regulatory region identification, SOX7-HEY1 protein interaction, in vivo conditional KO, non-cell-autonomous mechanism established\",\n      \"pmids\": [\"36715213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Endothelial-specific loss of Sox7 in mice causes ventricular non-compaction cardiomyopathy with abnormal coronary artery formation; Sox7 maintains cardiac endothelial identity by regulating the Notch pathway and connexins 37 and 40 for coronary arterial specification. Sox7-null endothelial cells transdifferentiate into hematopoietic lineages; single-nuclei transcriptomics identifies depletion of Sox9/Gpc3-positive endocardial progenitors.\",\n      \"method\": \"Endothelial-specific conditional KO, single-nuclei transcriptomics, fate mapping, histology\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined phenotype, pathway analysis via single-nuclei transcriptomics, fate mapping\",\n      \"pmids\": [\"37551717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SOX7 binds to the promoter of DNMT3B and transcriptionally inhibits DNMT3B expression, resulting in reduced methylation of the CYGB promoter and inhibiting bladder cancer progression.\",\n      \"method\": \"ChIP assay (SOX7 binding to DNMT3B promoter), bisulfite sequencing (CYGB methylation), overexpression/knockdown, in vivo tumor models\",\n      \"journal\": \"Molecular biomedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP demonstrating direct binding plus methylation analysis, single lab\",\n      \"pmids\": [\"39227479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In hepatocellular carcinoma cells, Sox7 physically binds with beta-catenin and TCF4 in the nucleus and inhibits the activity of Wnt/beta-catenin signaling pathway; miR-452 promotes stem-like characteristics by directly targeting Sox7.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter assay, in vitro and in vivo stem-like cell assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus reporter assay, single lab\",\n      \"pmids\": [\"27058905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Sox7 knockdown in primary myoblasts causes impaired myoblast fusion and increased sensitivity to apoptosis; conditional Sox7 knockout in PAX3+ cells in vivo reduces the satellite cell population from birth, reduces myofiber caliber, and impairs muscle regeneration after injury.\",\n      \"method\": \"Conditional knockout mouse (PAX3-Cre), shRNA knockdown in primary myoblasts, ES cell differentiation, in vivo injury model\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined regeneration phenotype plus in vitro mechanistic follow-up, multiple approaches\",\n      \"pmids\": [\"28943254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SOX7 attenuates hepatic stellate cell (HSC) activation and liver fibrosis by decreasing beta-catenin expression and reducing TGF-β1-induced phosphorylation of Smad2 and Smad3; AAV8-SOX7 overexpression in mice ameliorates CCl4-induced liver fibrosis in vivo.\",\n      \"method\": \"AAV8-mediated overexpression in mouse fibrosis model, siRNA knockdown, Western blot, in vivo CCl4 model\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo AAV gain-of-function with defined pathway (Smad2/3, beta-catenin), single lab\",\n      \"pmids\": [\"39126242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SOX7 is upregulated by aspirin in colorectal cancer cells via the p38MAPK pathway; AP1 transcription factors c-Jun and c-Fos upregulate SOX7 promoter activity, and SOX7 mediates aspirin-induced growth inhibition.\",\n      \"method\": \"Luciferase reporter assay, p38MAPK inhibition (SB203580), RT-PCR, Western blot, MTT assay\",\n      \"journal\": \"World journal of gastroenterology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter assay plus pharmacological epistasis, single lab\",\n      \"pmids\": [\"22171135\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SOX7 is a SoxF-family HMG-box transcription factor that directly binds DNA at SOX consensus sites (validated by EMSA and ChIP) to activate target genes including VE-cadherin, Fgf-3, Lama1, VEGFC-repressive elements, Wnt4, Bmp2, SPRY1, SLIT2, and GATA4/BMP2, while also functioning through protein-protein interactions with beta-catenin (disrupting its TCF/BCL9 co-activator complexes), RUNX1 (inhibiting its DNA binding and CBFβ interaction), GATA4, and HEY1 to suppress Wnt/beta-catenin and promote or restrain endothelial, hematopoietic, and cardiac cell fate decisions; in vascular development, SOX7 acts redundantly with SOX17/SOX18 to specify arteriovenous identity upstream of Notch/Gridlock and non-cell-autonomously patterns lymphatic vessels by repressing VEGFC transcription, while in cancer contexts SOX7 is frequently silenced by promoter hypermethylation and acts as a tumor suppressor through beta-catenin inhibition and MAPK/ERK-BIM-mediated apoptosis regulation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SOX7 is an HMG-box transcription factor that orchestrates vascular, cardiac, hematopoietic, and endodermal cell-fate decisions through both sequence-specific DNA binding and protein-protein interactions [#1, #5, #15]. Through its HMG box it binds SOX consensus sites in target enhancers and promoters to activate transcription of laminin alpha1 in parietal endoderm [#1], Fgf-3 (where it competes with GATA-4) [#2], VE-cadherin in haemogenic and outflow-tract endothelium [#10, #32], and Wnt4/Bmp2 in the atrioventricular canal [#21], while repressing other targets including a VEGFC regulatory locus, DNMT3B, and the proteasome-subunit PSME enhancer [#34, #36, #23]. In vascular development SOX7 acts redundantly with SOX17 and SOX18 to specify arteriovenous identity, functioning upstream of Notch/Gridlock(Hey2) and EphrinB2, with loss producing arteriovenous shunts and ectopic venous Flt4 expression [#5, #6, #13, #14]; its own expression is driven by ETV2 and HIF during endothelial specification and hypoxic angiogenesis [#12, #31]. SOX7 also restrains hematopoietic commitment from endothelium by directly inhibiting RUNX1 DNA binding and disrupting the RUNX1-CBFβ interaction [#15], and sustains endothelial over hematopoietic identity in coronary and endocardial development [#35]. A second mode of action is direct binding to β-catenin, by which SOX7 depletes active β-catenin and competes with BCL9 and TCF4 to suppress Wnt/β-catenin transcription—a mechanism underlying its tumor-suppressive and pro-apoptotic roles, frequently lost through promoter hypermethylation in cancer [#7, #18, #20, #19]. SOX7 cooperates with cardiac factors GATA4 and NKX2.5, and is induced by GATA4, to regulate cardiomyocyte and cardiovascular progenitor differentiation [#22, #27, #33]. Haploinsufficiency causes diaphragmatic hernia and homozygous loss causes cardiovascular failure in mice, and SOX7 mutations are found in congenital heart disease patients where they weaken transactivation of cardiac targets [#11, #32, #33].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that SOX7 is a transcriptional activator that can antagonize Wnt/β-catenin signaling, defining its dual activator/repressor logic.\",\n      \"evidence\": \"Transactivation domain mapping and TCF/LEF reporter assays in cultured cells\",\n      \"pmids\": [\"11691915\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct DNA targets identified\", \"Mechanism of β-catenin antagonism not defined at this stage\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified the first direct SOX7 DNA targets and an endodermal program, showing HMG-box-dependent activation of Lama1 and Fgf-3 and placement upstream of GATA-4/6.\",\n      \"evidence\": \"EMSA, luciferase reporter mutagenesis, siRNA knockdown and rescue in F9 embryonal carcinoma/embryoid body systems\",\n      \"pmids\": [\"15220343\", \"15082719\", \"15542856\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Restricted to F9/embryoid-body context\", \"Genome-wide target repertoire unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated functional redundancy with SOX18 in cardiogenesis and showed β-catenin interaction is dispensable for this developmental activity, separating DNA-binding from protein-interaction modes.\",\n      \"evidence\": \"mRNA injection, morpholino knockdown, reciprocal rescue, and domain-swap experiments in Xenopus\",\n      \"pmids\": [\"16193513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct cardiac target genes not identified here\", \"Relationship to mammalian heart development untested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the redundant SoxF role in arteriovenous identity, placing sox7/sox18 upstream of Gridlock/Hey2 and arterial markers.\",\n      \"evidence\": \"Combinatorial morpholino knockdown with arteriovenous marker in situ hybridization in zebrafish\",\n      \"pmids\": [\"18094332\", \"18377889\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect regulation of Hey2/EphrinB2 not resolved\", \"Relative contribution of each SoxF gene unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Established the molecular basis of SOX7 Wnt antagonism in cancer—direct β-catenin binding and depletion—and linked promoter hypermethylation to its silencing as a tumor suppressor.\",\n      \"evidence\": \"Co-IP, luciferase reporter, bisulfite sequencing in prostate and colorectal cancer cells\",\n      \"pmids\": [\"18819930\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP\", \"Whether DNA binding is required for tumor suppression not addressed here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed SOX7 restrains hematopoietic differentiation, maintaining multipotent self-renewing precursors during ES cell differentiation.\",\n      \"evidence\": \"Inducible Sox7 overexpression in ES cell differentiation with flow cytometry and colony assays\",\n      \"pmids\": [\"19801444\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional targets mediating the block not defined\", \"Single gain-of-function system\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected the endothelial/hematopoietic switch to a direct target, showing SOX7 binds and activates the VE-cadherin promoter and sustains endothelial identity in haemogenic endothelium; in vivo loss causes cardiovascular failure and diaphragmatic hernia.\",\n      \"evidence\": \"ChIP, luciferase reporter, ES cell gain-of-function; targeted Sox7 deletion mouse phenotyping\",\n      \"pmids\": [\"22492353\", \"22723016\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking endothelial maintenance to blood differentiation block not fully defined\", \"Diaphragmatic hernia mechanism unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Positioned SOX7 within the endothelial specification cascade as a direct ETV2 target mediating endothelial progenitor expansion.\",\n      \"evidence\": \"ChIP, reporter assay, shRNA knockdown and rescue in embryoid body differentiation\",\n      \"pmids\": [\"24762086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream SOX7 effectors in this context not enumerated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Refined the arteriovenous mechanism by placing Sox7 genetically upstream of Notch and establishing reciprocal SoxF cross-regulation and Wnt-dependent SoxF expression.\",\n      \"evidence\": \"Zebrafish sox7 mutant epistasis with NICD rescue; mouse retina combinatorial conditional KO with Wnt/VEGF pathway interactions\",\n      \"pmids\": [\"25834021\", \"26630461\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Notch-pathway target promoters of SOX7 not identified here\", \"How Wnt signaling controls SoxF transcription unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined a key protein-interaction mechanism in hematopoiesis: SOX7 directly inhibits RUNX1 by blocking its DNA binding and disrupting the RUNX1-CBFβ complex.\",\n      \"evidence\": \"Reciprocal Co-IP, single-cell expression, reporter assays in haemogenic endothelium\",\n      \"pmids\": [\"27802172\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the SOX7-RUNX1 interaction unknown\", \"In vivo requirement for this interaction not isolated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Detailed the β-catenin antagonism mechanism across tumor types—competition with BCL9 and binding to β-catenin/TCF4—and validated its requirement via domain deletion in AML.\",\n      \"evidence\": \"Co-IP, domain deletion functional assays, reporter assays, xenotransplantation in leukemia, endometrial, and hepatocellular cancer cells\",\n      \"pmids\": [\"25940713\", \"29271667\", \"23295859\", \"27058905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Most evidence from single-lab Co-IP per context\", \"Relative contribution of DNA binding vs β-catenin sequestration not quantified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed context-dependent pro-tumor vascular functions, with SOX7 driving VEGFR2 and pericyte IL-33 to promote vascular abnormality and metastasis, contrasting its tumor-suppressor role.\",\n      \"evidence\": \"Conditional endothelial Sox7 deletion and xenograft gain/loss-of-function with pathway inhibition\",\n      \"pmids\": [\"29444818\", \"27150562\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation of pro- vs anti-tumor roles by tissue context incomplete\", \"Direct vs indirect VEGFR2 regulation not fully shown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Expanded the direct cardiac target set and cofactor network—SOX7 binds Wnt4/Bmp2 promoters to drive EndMT, cooperates with GATA4 and NKX2.5, and is itself induced by GATA4.\",\n      \"evidence\": \"Conditional KO mice, ChIP, protein rescue, ChIP-Seq/ATAC-Seq, Co-IP, cross-species knockdown/rescue, patient-variant reporter assays\",\n      \"pmids\": [\"33846290\", \"29229250\", \"31154937\", \"35422912\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise cooperativity mechanism with NKX2.5 not structurally defined\", \"Genome-wide direct vs indirect targets partially resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed SOX7 represses an additional direct target (PSME) via SOX-box sites and demonstrated its nuclear localization signal, not the β-catenin motif, is essential for this repression—dissociating repression from Wnt antagonism.\",\n      \"evidence\": \"ChIP, EMSA, reporter assays with domain-deletion mutants in cancer cell lines\",\n      \"pmids\": [\"30488457\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generalizability of NLS-dependent repression to other targets untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the tissue-specific in vivo requirement for SOX7 in vascular progenitors and confirmed it is dispensable in committed hematopoietic cells.\",\n      \"evidence\": \"FLK1-Cre and VAV-Cre conditional knockout mouse embryo phenotyping\",\n      \"pmids\": [\"28577909\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct effectors of vascular organization defect not identified here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Broadened the target landscape and effector mechanism in cancer, identifying direct activated (SPRY1, SLIT2) and repressed (TRIB3, MTHFD2) targets and a pro-apoptotic pathway stabilizing BIM via MEK/ERK and the proteasome.\",\n      \"evidence\": \"ChIP and microarray profiling in breast cancer; pharmacological pathway dissection of P38/MEK-ERK-BIM\",\n      \"pmids\": [\"29757932\", \"31332289\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab ChIP per target\", \"Direct vs indirect control of BIM stability not fully resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Extended SOX7 function beyond vasculature to skeletal muscle, where it maintains satellite cells and supports myoblast fusion and regeneration.\",\n      \"evidence\": \"PAX3-Cre conditional KO mice, shRNA knockdown in primary myoblasts, in vivo injury model\",\n      \"pmids\": [\"28943254\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional targets in muscle stem cells not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked SOX7 to neuronal apoptosis and antibody-mediated endothelial activation, expanding its β-catenin and Notch (Jagged1) regulatory roles.\",\n      \"evidence\": \"Co-IP and apoptosis assays in hippocampal neurons; shRNA and Jagged1 rescue in endothelial transplant models\",\n      \"pmids\": [\"25847511\", \"30639059\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab studies\", \"Direct vs indirect Jagged1/Notch regulation not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Positioned SOX7 as an early HIF-dependent effector of hypoxia-driven angiogenesis in human endothelial cells.\",\n      \"evidence\": \"RNA-Seq, siRNA depletion, angiogenesis assays, HIF1A/EPAS1 depletion in primary human ECs\",\n      \"pmids\": [\"32071080\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct HIF binding to SOX7 locus not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Tied SOX7 directly to human congenital heart disease by showing patient mutations weaken VE-cadherin transactivation and impair EndMT during outflow-tract development.\",\n      \"evidence\": \"EMSA, luciferase, collagen-gel EndMT assay, patient variant functional analysis\",\n      \"pmids\": [\"33720353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causality of patient variants in vivo not formally established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established SOX7 as a non-cell-autonomous repressor of lymphatic patterning via direct VEGFC repression and a SOX7-HEY1 interaction, and as a maintainer of cardiac endothelial identity preventing endothelial-to-hematopoietic transdifferentiation.\",\n      \"evidence\": \"Endothelial conditional KO mice, regulatory-region binding assays, Co-IP for SOX7-HEY1, single-nuclei transcriptomics and fate mapping\",\n      \"pmids\": [\"36715213\", \"37551717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HEY1 recruitment to Vegfc regulatory regions is direct not fully proven\", \"Mechanism of endothelial-to-hematopoietic transdifferentiation upon Sox7 loss incomplete\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Added an epigenetic effector arm, showing SOX7 represses DNMT3B to lower CYGB promoter methylation and suppress bladder cancer, and attenuates liver fibrosis through β-catenin and TGF-β/Smad pathways.\",\n      \"evidence\": \"ChIP, bisulfite sequencing, in vivo tumor models; AAV8-SOX7 overexpression in CCl4 fibrosis model\",\n      \"pmids\": [\"39227479\", \"39126242\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab findings\", \"Direct vs indirect Smad regulation not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the relative use of direct DNA binding versus β-catenin/RUNX1/HEY1 protein-interaction modes is selected across tissues, and what determines SOX7's context-dependent switch between tumor-suppressive and pro-angiogenic/pro-metastatic roles, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of SOX7 cofactor complexes\", \"Determinants of activator vs repressor output at individual loci unknown\", \"Integrated logic across vascular, cardiac, hematopoietic, and cancer contexts not unified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 2, 10, 21, 23, 24, 32, 34, 36]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 2, 10, 21, 27, 32, 34]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 15, 18, 20, 34]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [19, 23, 37]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 6, 11, 21, 22, 30, 32, 35]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 18, 20, 34, 13]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 2, 10, 23, 26, 36]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [7, 16, 17, 18, 24, 36]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CTNNB1\", \"RUNX1\", \"GATA4\", \"HEY1\", \"TCF4\", \"BCL9\", \"NKX2.5\", \"CBFB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}