{"gene":"SOX7","run_date":"2026-04-28T20:42:08","timeline":{"discoveries":[{"year":2001,"finding":"SOX7 protein contains a functional transactivation domain in its C-terminus and can significantly reduce Wnt/β-catenin-stimulated transcription, indicating it acts as a repressor of Wnt signaling.","method":"Transactivation domain mapping; reporter assay for Wnt/β-catenin transcription","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — functional transactivation domain identified and Wnt repression demonstrated, single lab","pmids":["11691915"],"is_preprint":false},{"year":2004,"finding":"SOX7 and SOX17 bind to two SOX-binding sites within the parietal endoderm-specific enhancer of the mouse laminin alpha1 (Lama1) gene via their HMG boxes, and synergistically transactivate this enhancer in cooperation with ubiquitous factors Sp1/Sp3 and NF-Y.","method":"EMSA, mutational analysis, luciferase reporter assay, Northern blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro DNA binding (EMSA) combined with mutagenesis and reporter assays","pmids":["15220343"],"is_preprint":false},{"year":2004,"finding":"SOX7 is a potent transcriptional activator of Fgf-3 through binding to the PS4A regulatory element of the Fgf-3 promoter; SOX7 competes with GATA-4 for PS4A occupancy, and siRNA-mediated knockdown of Sox7 abolishes Fgf-3 expression in GATA-4-deficient embryoid bodies.","method":"Luciferase reporter assay, nuclear extract binding, RNA interference, in situ hybridization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding competition shown with nuclear extracts, reporter assay, and functional knockdown","pmids":["15082719"],"is_preprint":false},{"year":2004,"finding":"Sox7 silencing in F9 embryonal carcinoma cells inhibits retinoic acid/cAMP-induced upregulation of Gata-4 and Gata-6, and inhibits parietal endoderm differentiation; Sox7 acts upstream of Gata-4 and Gata-6, and overexpression of either GATA factor rescues differentiation in Sox7-silenced cells.","method":"siRNA knockdown, Western blot, morphological analysis, laminin-1 production assay, rescue overexpression","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function with defined phenotype and rescue experiment, multiple orthogonal methods","pmids":["15542856"],"is_preprint":false},{"year":2005,"finding":"In Xenopus, SOX7 and SOX18 are redundantly required for cardiogenesis; versions of SOX7 and SOX18 with their C-terminal β-catenin interaction domains replaced by a transcriptional activator still induce cardiogenesis, indicating the cardiogenic function is independent of β-catenin antagonism.","method":"Morpholino knockdown, RNA overexpression, domain-swap mutant injection, animal cap explant assay","journal":"Developmental dynamics","confidence":"High","confidence_rationale":"Tier 2 — domain mutagenesis with functional readout and reciprocal rescue experiments","pmids":["16193513"],"is_preprint":false},{"year":2007,"finding":"Zebrafish sox7 and sox18 play redundant but collectively essential roles in establishing arteriovenous identity in endothelial cells; simultaneous morpholino knockdown of both genes causes multiple arteriovenous fusions with failure of venous endothelial cell differentiation, while endothelial cell specification is preserved.","method":"Morpholino knockdown, transgenic reporter lines, in situ hybridization for arterial/venous markers","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — double morphant epistasis with detailed molecular marker analysis; replicated in companion paper (PMID:18377889)","pmids":["18094332"],"is_preprint":false},{"year":2008,"finding":"Zebrafish Sox7 and Sox18 control arterial-venous identity by regulating Gridlock expression; loss of both genes causes ectopic expression of venous marker Flt4 in the dorsal aorta and loss of artery-specific markers EphrinB2a and Gridlock.","method":"Morpholino double knockdown, in situ hybridization, transgenic reporter lines","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis placing Sox7/Sox18 upstream of Gridlock in arteriovenous specification, replicated finding","pmids":["18377889"],"is_preprint":false},{"year":2008,"finding":"SOX7 protein physically interacts with β-catenin and suppresses β-catenin-mediated transcription by depleting active β-catenin; Sox7 promoter is hypermethylated in prostate and colorectal cancers, and ectopic SOX7 suppresses proliferation in colorectal cancer cells with endogenous mutant β-catenin.","method":"Co-immunoprecipitation, reporter assay, bisulfite sequencing, cell proliferation/colony formation assays","journal":"Molecular cancer research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP showing direct protein interaction plus functional reporter assays and loss-of-function readout","pmids":["18819930"],"is_preprint":false},{"year":2009,"finding":"Sox7 and Sox17 are strain-specific modifiers that can functionally substitute for Sox18 in lymphatic development in vitro and in vivo; they are not normally expressed during lymphatic development but are specifically upregulated in the absence of Sox18 function in permissive strains.","method":"In vitro functional substitution assay, in vivo genetic analysis across mouse strains, gene expression analysis","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 — cross-strain genetic modifier analysis with functional in vitro and in vivo substitution tests","pmids":["19515696"],"is_preprint":false},{"year":2009,"finding":"Sox7 sustained expression in earliest committed hematopoietic precursors (from mouse ES cell differentiation) promotes maintenance of multipotent, self-renewing status and blocks differentiation; removal of this block permits efficient differentiation to erythroid and myeloid lineages. Sox7 knockdown decreases formation of primitive erythroid and definitive hematopoietic progenitors.","method":"Inducible overexpression, siRNA knockdown, ES cell differentiation assay, colony forming assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — inducible gain/loss-of-function with defined hematopoietic phenotype","pmids":["19801444"],"is_preprint":false},{"year":2009,"finding":"Sox7 and Sox15 both upregulate muscle precursor markers Pax3/7, Meox1, and Foxc1 in P19 cells, but only Sox7 is sufficient to drive full skeletal myocyte differentiation; Sox15 blocks progression past the precursor stage through sustained Msx1 and Id1 expression.","method":"Stable overexpression in P19 cells, qRT-PCR, immunofluorescence for myogenic markers, dominant-negative analysis","journal":"Stem cells","confidence":"Medium","confidence_rationale":"Tier 2 — gain-of-function with defined molecular phenotype, single lab","pmids":["19489079"],"is_preprint":false},{"year":2012,"finding":"SOX7 is expressed in haemogenic endothelium cells during haemangioblast differentiation and its enforced expression blocks further differentiation toward blood precursors while sustaining endothelial markers; SOX7 directly binds and activates the promoter of VE-cadherin, identifying it as a transcriptional target.","method":"Gain-of-function in mouse ES cell differentiation, chromatin immunoprecipitation (ChIP), promoter-reporter assay, flow cytometry","journal":"Development","confidence":"High","confidence_rationale":"Tier 1-2 — direct promoter binding by ChIP plus reporter assay and functional gain-of-function with defined cellular phenotype","pmids":["22492353"],"is_preprint":false},{"year":2012,"finding":"Sox7 haploinsufficiency in mice causes anterior diaphragmatic hernias; SOX7 is expressed in vascular endothelial cells of the developing diaphragm. Complete Sox7 knockout leads to embryonic lethality with dilated pericardial sacs and failure of yolk sac remodeling indicating cardiovascular failure.","method":"Targeted gene deletion (exon 2), immunohistochemistry, phenotypic analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — clean knockout mouse model with specific developmental phenotype and localization data","pmids":["22723016"],"is_preprint":false},{"year":2014,"finding":"ETV2 is a direct upstream transcriptional regulator of Sox7; ETV2 binds to ETV2 binding elements in the Sox7 upstream regulatory region and activates transcription. SOX7 overexpression mimics ETV2 in promoting endothelial progenitor cell formation and angiogenic sprouting, while Sox7 knockdown blocks ETV2-induced endothelial progenitor increases.","method":"ChIP of ETV2 at Sox7 regulatory region, reporter assay, overexpression and shRNA knockdown in embryoid bodies","journal":"Stem cells and development","confidence":"High","confidence_rationale":"Tier 1-2 — direct ChIP establishing ETV2 binding at Sox7 locus plus epistasis via knockdown","pmids":["24762086"],"is_preprint":false},{"year":2015,"finding":"Combined deletion of Sox7, Sox17, and Sox18 in mouse retinal vascular endothelium leads to a dense capillary plexus with near-complete loss of radial arteries and veins; individual deletions have minimal effect due to overlapping function and reciprocal transcriptional regulation between Sox7 and Sox17.","method":"Conditional endothelial-specific gene deletion, retinal flatmount analysis, vascular smooth muscle cell coverage assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — triple conditional knockout with detailed vascular phenotyping, multiple orthogonal methods","pmids":["26630461"],"is_preprint":false},{"year":2015,"finding":"In zebrafish, sox7 mutants display aberrant arteriovenous connections and arterial block; genetic interaction studies show sox7 works with hey2 and efnb2 for arterial specification, and overexpression of Notch intracellular domain rescues the sox7 mutant phenotype, placing Sox7 upstream of Notch in arterial development.","method":"Zebrafish genetic mutants, in vivo imaging, in situ hybridization, genetic epistasis/rescue with NICD overexpression","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with pathway rescue placing Sox7 upstream of Notch signaling","pmids":["25834021"],"is_preprint":false},{"year":2015,"finding":"SOX7 directly binds β-catenin protein and inhibits Wnt/β-catenin transcriptional activity in AML cells; deletion of the β-catenin binding site in SOX7 significantly reduces its anti-leukemia effects, and SOX7 expression abrogates leukemia engraftment in xenograft transplantation.","method":"Co-immunoprecipitation, domain deletion mutant, xenograft transplantation, reporter assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — direct protein binding shown by Co-IP with domain deletion providing mechanistic proof; functional xenograft validation","pmids":["25940713"],"is_preprint":false},{"year":2016,"finding":"SOX7 directly interacts with RUNX1 and inhibits its transcriptional activity by hindering RUNX1 DNA binding and blocking the interaction between RUNX1 and its co-factor CBFβ; this mechanism regulates hemogenic endothelium differentiation in the yolk sac.","method":"Co-immunoprecipitation, ChIP, single-cell expression profiling, immunofluorescence","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 — direct protein-protein interaction shown by Co-IP with mechanistic follow-up showing disruption of RUNX1/CBFβ complex","pmids":["27802172"],"is_preprint":false},{"year":2016,"finding":"SOX7 acts as a transcription factor to upregulate IL-33 in pericytes upon PDGF-BB stimulation; IL-33 is the highest upregulated gene following SOX7 activation, and this IL-33-ST2-dependent pathway promotes macrophage recruitment and cancer metastasis.","method":"Gain- and loss-of-function experiments, gene expression analysis, pharmacological inhibition of IL-33-ST2, xenograft mouse models","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — gain/loss-of-function with defined downstream target and in vivo validation, single lab","pmids":["27150562"],"is_preprint":false},{"year":2016,"finding":"Sox7 in tumor endothelial cells promotes VEGFR2 expression and vascular abnormality in high-grade glioma; Sox7 deletion suppressed VEGFR2 expression, while Sox17 deletion exacerbated abnormality by up-regulating Sox7.","method":"Endothelial conditional deletion, in vivo imaging, immunofluorescence, gene expression analysis","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — conditional knockout with specific molecular target (VEGFR2) identified and reciprocal regulation with Sox17 demonstrated","pmids":["29444818"],"is_preprint":false},{"year":2017,"finding":"SOX7 directly binds to the VE-cadherin gene promoter and up-regulates its expression in endothelial cells, thereby suppressing endothelial-to-mesenchymal transition (EndMT); luciferase and EMSA confirmed direct promoter binding, and VE-cadherin knockdown partly reverses SOX7-mediated repression of EndMT.","method":"Luciferase reporter assay, EMSA, collagen gel culture system, VE-cadherin knockdown rescue","journal":"Clinical science","confidence":"High","confidence_rationale":"Tier 1-2 — direct DNA binding confirmed by EMSA and luciferase with functional rescue experiment","pmids":["33720353"],"is_preprint":false},{"year":2017,"finding":"Sox7 is expressed in FLK1+ endothelial progenitors and its conditional deletion in FLK1+ cells leads to widespread vascular defects by E10.5 including disorganized endothelial cords instead of paired dorsal aorta; hematopoietic-specific (VAV-cre) deletion of Sox7 does not affect the hematopoietic system.","method":"FLK1-specific conditional knockout, VAV-specific conditional knockout, histological analysis of embryos from E7.5 to E10.5","journal":"Mechanisms of development","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional knockouts defining the endothelial-specific requirement for SOX7","pmids":["28577909"],"is_preprint":false},{"year":2017,"finding":"GATA4 specifically regulates Sox7 and Sox18 expression during cardiomyogenesis; knockdown of Gata4 reduces Sox7/Sox18 expression, and reinstating Sox7 or Sox18 partially rescues cardiomyocyte differentiation lost upon Gata4 knockdown; this axis is conserved between Xenopus and mouse ESCs.","method":"Genome-wide transcriptomics, morpholino knockdown, RNA rescue experiments, mouse ESC knockdown","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — genome-wide transcriptomics combined with morpholino epistasis and cross-species conservation","pmids":["29229250"],"is_preprint":false},{"year":2017,"finding":"SOX7 suppresses Wnt signaling by competing with BCL9 for binding to β-catenin; co-immunoprecipitation showed SOX7 binds β-catenin and disrupts the β-catenin/BCL9 interaction, thereby inhibiting β-catenin/TCF-mediated transcription.","method":"Co-immunoprecipitation, super TopFlash reporter assay","journal":"DNA and cell biology","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP demonstrating competition mechanism, supported by reporter assay, single lab","pmids":["29271667"],"is_preprint":false},{"year":2017,"finding":"Sox7 regulates Sox7 expression in endothelial cells via ETS factor ETV2; Sox7 is required for endothelial cell VEGFR2 expression, angiogenic sprouting from embryoid bodies, and cardiovascular development.","method":"Inducible expression, ChIP at Sox7 regulatory region, shRNA knockdown in EBs","journal":"Stem cells and development","confidence":"High","confidence_rationale":"Tier 1-2 — direct ChIP establishing regulatory region occupancy plus epistasis","pmids":["24762086"],"is_preprint":false},{"year":2017,"finding":"Sox7 directly represses PSMA/FOLH1 expression by binding to SOX box sites #2 and #4 within the PSMA enhancer (PSME); the nuclear localization signal (NLS) regions of SOX7, but not its β-catenin-interacting motif, are essential for this suppressive activity.","method":"ChIP, EMSA, luciferase reporter assay, Sox7 NLS mutant, stable expression in prostate cancer cells","journal":"The Prostate","confidence":"High","confidence_rationale":"Tier 1 — direct DNA binding by ChIP and EMSA, mutagenesis of binding sites and NLS domain, functional validation","pmids":["30488457"],"is_preprint":false},{"year":2017,"finding":"SOX7 is identified as a transcriptional repressor of the Hepatitis B virus core promoter (HBVCP); SOX7 binds specifically to the HBVCP via its HMG box and competitively displaces hepatocyte nuclear factor 4α, inhibiting pgRNA synthesis, HBcAg and cccDNA accumulation.","method":"EMSA, luciferase reporter assay, HBV replicon and infection models, stapled peptide experiments","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 1-2 — EMSA for direct DNA binding plus functional reporter assays and infection models with peptide mimetics","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; treatment with proteasome inhibitor MG132/bortezomib or p-ERK/MEK inhibitor U0126 attenuates SOX7-promoted BIM degradation.","method":"Gene expression profiling, pharmacological inhibition (MG132, bortezomib, U0126), Western blot, loss-of-function","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic pathway identified via pharmacological dissection, single lab","pmids":["31332289"],"is_preprint":false},{"year":2018,"finding":"SOX7 validated target genes in breast cancer cells include SPRY1 and SLIT2 (SOX7-activated) and TRIB3 and MTHFD2 (SOX7-repressed); these were identified by microarray combined with ChIP validation and confirmed to differentially contribute to tumor suppression.","method":"Microarray gene expression profiling, ChIP assay, qPCR validation","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — direct chromatin binding by ChIP plus expression validation, single lab","pmids":["29757932"],"is_preprint":false},{"year":2019,"finding":"SOX7 is required for muscle satellite cell development and maintenance; conditional knockout of Sox7 in PAX3+ cells reduces satellite cell population from birth, reduces myofiber caliber, impairs regeneration after injury, and increases sensitivity to apoptosis; SOX7-deficient primary myoblasts show impaired myoblast fusion.","method":"Conditional PAX3-Cre knockout mouse, satellite cell quantification, injury-induced regeneration assay, primary myoblast culture","journal":"Stem cell reports","confidence":"High","confidence_rationale":"Tier 2 — conditional knockout mouse model with defined phenotypic readouts across multiple assays","pmids":["28943254"],"is_preprint":false},{"year":2019,"finding":"Sox7 enforced expression in adult bone marrow progenitors promotes proliferation of multi-lineage short-term engrafting blood progenitors and induces a profound block in B lymphocyte generation both ex vivo and in vivo, causing extra-medullary hematopoiesis in spleen and liver.","method":"Inducible transgenic mouse model, bone marrow/stroma co-culture, transplantation assay, FACS","journal":"Open biology","confidence":"High","confidence_rationale":"Tier 2 — inducible transgenic model with in vivo and ex vivo functional hematopoietic readouts","pmids":["27411892"],"is_preprint":false},{"year":2019,"finding":"Sox7 promotes endothelial cell activation via the Jagged1-Notch1 pathway upon HLA I antibody stimulation; Sox7 knockdown reduces adhesion molecules (VCAM-1, ICAM-1), inflammatory cytokines (IL-6, TNF-α), and Jagged1-Notch1 signaling; Jagged1 overexpression rescues the effect of Sox7 knockdown.","method":"shRNA knockdown, Notch pathway inhibition (DAPT), Jagged1 overexpression rescue, in vivo kidney transplantation model","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — knockdown with pathway inhibition and rescue experiment, in vivo validation, single lab","pmids":["30639059"],"is_preprint":false},{"year":2019,"finding":"Sox7 regulates lineage decisions in cardiovascular progenitor cells by promoting endothelial cell fate at the expense of cardiac lineage; ChIP-Seq combined with ATAC-Seq identified Sox7 target genes; SOX7 directly protein-protein interacts with GATA4 and interferes with GATA4 transcriptional activity on cardiac genes; Sox7 modulates WNT and BMP signaling during cardiovascular differentiation.","method":"ChIP-Seq, ATAC-Seq, transcriptomics, Co-immunoprecipitation (SOX7-GATA4 interaction), doxycycline-inducible overexpression","journal":"Stem cells and development","confidence":"High","confidence_rationale":"Tier 1-2 — genome-wide ChIP-Seq plus Co-IP for protein interaction and multi-omics integration","pmids":["31154937"],"is_preprint":false},{"year":2020,"finding":"SOX7 is rapidly and transiently upregulated in human endothelial cells during hypoxia and is required for hypoxia-induced angiogenesis; SOX7 depletion impairs angiogenic response in cultured primary human umbilical vein endothelial cells.","method":"RNA-Seq temporal profiling, siRNA knockdown, tube formation and sprouting angiogenesis assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — transcriptomics combined with functional knockdown, single lab","pmids":["32071080"],"is_preprint":false},{"year":2021,"finding":"Sox7 deficiency in mouse atrioventricular canal reduces Bmp2 in myocardium and Wnt4 in endocardium; Sox7 directly binds to the Wnt4 and Bmp2 promoters; exogenous WNT4 or BMP2 partially rescues impaired endothelial-to-mesenchymal transition (EndMT) caused by Sox7 deficiency, with BMP2 acting downstream of WNT4.","method":"Conditional knockout mouse, transcriptome analysis, ChIP/direct promoter binding assays, protein rescue experiments, Noggin inhibition","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1-2 — direct DNA binding plus epistasis rescue experiments defining Wnt4-Bmp2 pathway downstream of Sox7","pmids":["33846290"],"is_preprint":false},{"year":2022,"finding":"Loss-of-function SOX7 mutation (Gln104*) fails to transactivate target genes GATA4 and BMP2 and invalidates cooperative transactivation with NKX2.5, as demonstrated by dual-luciferase reporter analysis; this mutation co-segregates with congenital heart disease in a pedigree.","method":"Dual-luciferase reporter assay, whole-exome sequencing, Sanger sequencing","journal":"American journal of translational research","confidence":"Medium","confidence_rationale":"Tier 2 — functional reporter assay with disease-segregating variant, single lab","pmids":["35422912"],"is_preprint":false},{"year":2023,"finding":"SOX7 in blood vascular endothelial cells non-cell-autonomously patterns lymphatic vessels by directly repressing VEGFC transcription at distant regulatory regions; SOX7 also directly binds HEY1 (a canonical Notch pathway repressor), suggesting recruitment of HEY1 to VEGFC genomic regulatory regions as a mechanism of transcriptional repression.","method":"Conditional loss-of-function in mice, identification of distant regulatory regions, direct binding assay, Co-IP for SOX7-HEY1 interaction","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — conditional knockout with identification of direct regulatory targets and protein-protein interaction, in vivo lymphatic phenotype","pmids":["36715213"],"is_preprint":false},{"year":2023,"finding":"Endothelial-specific loss of Sox7 in mice leads to ventricular non-compaction-like defects and abnormal coronary artery formation; Sox7 loss disrupts transcriptional regulation of Notch pathway genes and connexins 37 and 40, which govern coronary arterial specification; a subset of Sox7-null endothelial cells transdifferentiate into hematopoietic lineages.","method":"Endothelial-specific conditional knockout, single-nuclei transcriptomics, fate mapping, immunofluorescence","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — conditional knockout with single-nucleus transcriptomics and fate mapping providing multi-level mechanistic insight","pmids":["37551717"],"is_preprint":false},{"year":2012,"finding":"SOX7 co-localizes with mutant β-catenin or TCF4 in the nucleus and physically interacts with both wild-type and mutant β-catenin as well as TCF4; SOX7 inhibits TCF/LEF-1-dependent transcription induced by Wnt-1 and suppresses Wnt targets Cyclin D1 and c-Myc in endometrial cancer cells.","method":"Co-immunoprecipitation, immunofluorescent microscopy, luciferase reporter assay, Western blot","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 2 — Co-IP demonstrating direct interaction with β-catenin and TCF4, supported by colocalization and reporter assays","pmids":["23295859"],"is_preprint":false},{"year":2024,"finding":"SOX7 binds to the promoter of DNMT3B and transcriptionally represses it, leading to reduced methylation of the CYGB promoter and inhibition of bladder cancer progression; the SOX7/DNMT3B/CYGB axis was validated by ChIP and functional experiments.","method":"ChIP assay, Western blot, RNA-seq, immunohistochemistry, knockdown and overexpression experiments in BCa cell lines","journal":"Molecular biomedicine","confidence":"Medium","confidence_rationale":"Tier 2 — direct promoter binding by ChIP with functional downstream methylation consequence, single lab","pmids":["39227479"],"is_preprint":false}],"current_model":"SOX7 is a transcription factor (SoxF family, HMG-box) that binds DNA at SOX consensus sites to activate or repress target genes (including VE-cadherin, VEGFC, Fgf-3, PSMA, Bmp2, Wnt4, GATA4, SPRY1, SLIT2), forms protein complexes with β-catenin, TCF4, RUNX1, GATA4, BCL9, and HEY1 to modulate Wnt/β-catenin, Notch, and hematopoietic transcriptional programs, acts redundantly with Sox17/Sox18 to establish arteriovenous identity, and functions as a context-dependent regulator of endothelial cell identity, haemogenic endothelium-to-blood transition, vascular and cardiac development, and tumor suppression across multiple cancer types primarily through inhibition of the Wnt/β-catenin pathway."},"narrative":{"teleology":[{"year":2001,"claim":"Identifying SOX7 as a transcription factor with an intrinsic transactivation domain that can repress Wnt/β-catenin signaling established its dual capacity as activator and repressor.","evidence":"Transactivation domain mapping and Wnt reporter assays","pmids":["11691915"],"confidence":"Medium","gaps":["Mechanism of Wnt repression not defined at the protein-interaction level","No endogenous target genes identified"]},{"year":2004,"claim":"Demonstration that SOX7 directly binds DNA at SOX sites to activate Lama1 and Fgf-3 promoters, and that it acts upstream of GATA-4/GATA-6 in parietal endoderm differentiation, defined its earliest transcriptional targets and placed it in an endoderm differentiation hierarchy.","evidence":"EMSA, mutagenesis, reporter assays, siRNA knockdown in F9 cells with rescue by GATA factors","pmids":["15220343","15082719","15542856"],"confidence":"High","gaps":["Genome-wide binding profile not yet determined","In vivo relevance in mouse embryos not tested"]},{"year":2005,"claim":"Showing that SOX7 and SOX18 redundantly drive cardiogenesis in Xenopus through a β-catenin-independent mechanism revealed that SOX7's transcriptional activator function, not just Wnt antagonism, underlies heart development.","evidence":"Morpholino knockdown and domain-swap mutant injection in Xenopus animal cap explants","pmids":["16193513"],"confidence":"High","gaps":["Mammalian cardiogenic function not yet confirmed","Direct cardiac target genes unknown"]},{"year":2007,"claim":"Discovery that combined loss of sox7 and sox18 in zebrafish causes arteriovenous fusions established that SoxF factors are collectively essential for arteriovenous specification while individually redundant.","evidence":"Morpholino double knockdown in zebrafish with arterial/venous marker analysis","pmids":["18094332","18377889"],"confidence":"High","gaps":["Direct transcriptional targets mediating arteriovenous identity not identified","Mechanism of venous repression unclear"]},{"year":2008,"claim":"Physical interaction between SOX7 and β-catenin, combined with SOX7 promoter hypermethylation in cancers, provided the first mechanistic basis for SOX7 as a Wnt pathway antagonist and tumor suppressor.","evidence":"Co-immunoprecipitation, bisulfite sequencing, colony formation assays in colorectal cancer cells","pmids":["18819930"],"confidence":"High","gaps":["Precise binding interface on β-catenin not mapped","In vivo tumor suppression not demonstrated"]},{"year":2009,"claim":"Functional substitution experiments showed Sox7 can replace Sox18 in lymphatic development, and enforced Sox7 expression in hematopoietic progenitors blocks differentiation while maintaining multipotency, defining its roles in lymphatic and hematopoietic fate.","evidence":"Cross-strain genetic analysis in mice; inducible overexpression and siRNA in ES cell hematopoietic differentiation","pmids":["19515696","19801444"],"confidence":"High","gaps":["Direct transcriptional targets in hematopoietic progenitors not identified","Mechanism by which Sox7 maintains multipotency unknown"]},{"year":2012,"claim":"ChIP-confirmed direct binding of SOX7 to the VE-cadherin promoter in haemogenic endothelium, plus SOX7 knockout lethality with cardiovascular failure, established SOX7 as a direct transcriptional regulator of endothelial identity essential for vascular development.","evidence":"ChIP and reporter assays in ES-derived haemogenic endothelium; targeted gene deletion in mouse with embryonic lethal phenotype","pmids":["22492353","22723016"],"confidence":"High","gaps":["Genome-wide ChIP-Seq targets not yet mapped","Relationship between VE-cadherin activation and vascular remodeling failure not resolved"]},{"year":2012,"claim":"Showing SOX7 interacts with both β-catenin and TCF4 and suppresses Wnt target genes Cyclin D1 and c-Myc extended the Wnt antagonism mechanism to include disruption of the β-catenin/TCF transcription complex.","evidence":"Co-immunoprecipitation, immunofluorescence colocalization, reporter assays in endometrial cancer cells","pmids":["23295859"],"confidence":"High","gaps":["Whether SOX7 displaces TCF4 from DNA or forms a ternary inhibitory complex not resolved"]},{"year":2015,"claim":"Genetic epistasis placing sox7 upstream of Notch (hey2, efnb2) in zebrafish arterial specification, and triple SoxF deletion causing near-complete loss of retinal arteries and veins, defined the pathway hierarchy and full extent of SoxF redundancy in vascular patterning.","evidence":"Zebrafish genetic mutants with NICD rescue; conditional triple knockout in mouse retinal endothelium","pmids":["25834021","26630461"],"confidence":"High","gaps":["Whether SOX7 directly activates Notch ligand/receptor transcription or acts indirectly not resolved","Mechanisms of reciprocal transcriptional regulation between Sox7 and Sox17 unclear"]},{"year":2015,"claim":"Domain deletion showing that the β-catenin binding site in SOX7 is required for anti-leukemia effects, and xenograft validation, provided the first in vivo evidence that Wnt antagonism is the primary tumor-suppressive mechanism of SOX7 in AML.","evidence":"Co-IP with domain deletion mutant, xenograft transplantation in AML","pmids":["25940713"],"confidence":"High","gaps":["Endogenous AML target genes downstream of SOX7-mediated Wnt suppression not identified"]},{"year":2016,"claim":"Discovery that SOX7 physically binds RUNX1, prevents RUNX1-CBFβ complex formation, and thereby blocks the haemogenic endothelium-to-blood transition revealed a protein-protein interaction mechanism distinct from SOX7's DNA-binding function.","evidence":"Co-immunoprecipitation, ChIP, single-cell expression profiling in yolk sac","pmids":["27802172"],"confidence":"High","gaps":["Structural basis of SOX7-RUNX1 interaction not determined","Whether SOX7 also directly represses RUNX1 target genes via DNA binding unknown"]},{"year":2017,"claim":"Multiple studies refined SOX7's mechanism: competition with BCL9 for β-catenin binding explained Wnt antagonism specificity; ChIP-Seq/ATAC-Seq mapped genome-wide targets and confirmed SOX7-GATA4 protein interaction in cardiovascular progenitor fate; and direct repression of PSMA enhancer was mapped to specific SOX box sites.","evidence":"Co-IP for BCL9 competition; ChIP-Seq, ATAC-Seq, and transcriptomics in cardiovascular progenitors; ChIP and EMSA at PSMA enhancer","pmids":["29271667","31154937","30488457"],"confidence":"High","gaps":["Structural model of SOX7-β-catenin-BCL9 competition not available","How SOX7-GATA4 interaction partitions target gene sets not fully resolved"]},{"year":2019,"claim":"Conditional knockout in PAX3+ cells demonstrated SOX7 is required for muscle satellite cell maintenance and myoblast fusion, extending its function beyond endothelium to skeletal muscle stem cells.","evidence":"Conditional PAX3-Cre knockout mouse with satellite cell quantification, injury-regeneration assay, primary myoblast culture","pmids":["28943254"],"confidence":"High","gaps":["Direct transcriptional targets in satellite cells not identified","Relationship to Wnt or Notch pathways in this context not tested"]},{"year":2021,"claim":"Identification of Wnt4 and Bmp2 as direct SOX7 targets in atrioventricular cushion development, with BMP2 acting downstream of WNT4, defined the signaling cascade by which SOX7 controls endothelial-to-mesenchymal transition in heart valve formation.","evidence":"Conditional knockout mouse, ChIP at Wnt4 and Bmp2 promoters, protein rescue and Noggin inhibition","pmids":["33846290"],"confidence":"High","gaps":["Whether this Wnt4-Bmp2 axis operates in other SOX7-dependent developmental contexts unknown"]},{"year":2023,"claim":"Discovery that SOX7 in blood vascular endothelium non-cell-autonomously patterns lymphatic vessels by repressing VEGFC via recruitment of HEY1 to distant regulatory regions revealed a novel mechanism linking SOX7 to Notch effector-mediated transcriptional repression.","evidence":"Conditional loss-of-function in mice, identification of distant VEGFC regulatory regions, Co-IP for SOX7-HEY1 interaction","pmids":["36715213"],"confidence":"High","gaps":["Whether HEY1 recruitment is the sole mechanism of VEGFC repression not established","Genome-wide extent of SOX7-HEY1 co-regulation unknown"]},{"year":2023,"claim":"Single-nucleus transcriptomics after endothelial Sox7 loss revealed dysregulated Notch pathway genes and connexins 37/40 in coronary endothelium, and fate mapping showed transdifferentiation of Sox7-null endothelial cells into hematopoietic lineages, unifying SOX7's roles in arterial specification, coronary development, and endothelial-hematopoietic fate restriction.","evidence":"Endothelial-specific conditional knockout with single-nuclei transcriptomics and fate mapping","pmids":["37551717"],"confidence":"High","gaps":["Mechanistic link between connexin downregulation and non-compaction phenotype not established","Whether transdifferentiation occurs via de-repression of RUNX1 pathway not tested"]},{"year":null,"claim":"The structural basis of SOX7's protein-protein interactions (with β-catenin, RUNX1, GATA4, HEY1) remains unresolved, and it is unknown how SOX7 integrates its activator and repressor functions at distinct genomic loci in a cell-type-specific manner.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of SOX7 or its complexes","Cell-type-specific chromatin context determining activation versus repression not defined","Post-translational regulation of SOX7 activity largely unexplored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,2,11,20,25,26,34,36]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,2,3,11,20,25,26,28,34,39]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[7,16,17,23,38]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[25,38]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,5,6,12,14,15,21,22,34,37]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,2,11,20,25,26,28,36,39]}],"complexes":[],"partners":["CTNNB1","TCF4","RUNX1","GATA4","BCL9","HEY1","NKX2-5","SOX17"],"other_free_text":[]},"mechanistic_narrative":"SOX7 is a SoxF-family HMG-box transcription factor that governs endothelial cell identity, arteriovenous specification, cardiovascular morphogenesis, and the endothelial-to-hematopoietic transition, while also acting as a context-dependent tumor suppressor. SOX7 binds SOX consensus motifs via its HMG box to directly activate endothelial genes (VE-cadherin, VEGFR2) and repress targets such as VEGFC, PSMA, and DNMT3B, and it physically interacts with β-catenin to suppress Wnt/β-catenin transcription by competing with BCL9 and disrupting TCF4-mediated gene activation [PMID:18819930, PMID:29271667, PMID:23295859]. In vascular development, SOX7 functions redundantly with SOX17 and SOX18 to establish arterial identity and pattern lymphatic vessels, acting upstream of Notch signaling, and its endothelial-specific deletion causes arteriovenous malformations, coronary artery defects, and ventricular non-compaction [PMID:18094332, PMID:25834021, PMID:37551717, PMID:36715213]. SOX7 also directly interacts with RUNX1 to block the haemogenic endothelium-to-blood transition, interacts with GATA4 to balance endothelial versus cardiac progenitor fate, and regulates Wnt4/Bmp2 signaling in atrioventricular cushion development; loss-of-function SOX7 mutations co-segregate with congenital heart disease [PMID:27802172, PMID:31154937, PMID:33846290, PMID:35422912]."},"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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CR","url":"https://pubmed.ncbi.nlm.nih.gov/23557216","citation_count":63,"is_preprint":false},{"pmid":"19801444","id":"PMC_19801444","title":"Sox7-sustained expression alters the balance between proliferation and differentiation of hematopoietic progenitors at the onset of blood specification.","date":"2009","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/19801444","citation_count":61,"is_preprint":false},{"pmid":"24558429","id":"PMC_24558429","title":"Mir-184 post-transcriptionally regulates SOX7 expression and promotes cell proliferation in human hepatocellular carcinoma.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24558429","citation_count":60,"is_preprint":false},{"pmid":"25407488","id":"PMC_25407488","title":"MiR-492 contributes to cell proliferation and cell cycle of human breast cancer cells by suppressing SOX7 expression.","date":"2014","source":"Tumour biology : the journal of the International Society for Oncodevelopmental Biology and 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are competitive activators of Fgf-3 transcription.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15082719","citation_count":50,"is_preprint":false},{"pmid":"25940713","id":"PMC_25940713","title":"Suppression of SOX7 by DNA methylation and its tumor suppressor function in acute myeloid leukemia.","date":"2015","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/25940713","citation_count":49,"is_preprint":false},{"pmid":"27697092","id":"PMC_27697092","title":"miR-935 Promotes Liver Cancer Cell Proliferation and Migration by Targeting SOX7.","date":"2016","source":"Oncology research","url":"https://pubmed.ncbi.nlm.nih.gov/27697092","citation_count":48,"is_preprint":false},{"pmid":"25073511","id":"PMC_25073511","title":"miR-24 promotes the proliferation and invasion of HCC cells by targeting SOX7.","date":"2014","source":"Tumour biology : the journal of the International Society for Oncodevelopmental Biology and 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polyphyllin D-induced G0/G1 cell cycle arrest through down-regulation of cyclin D1.","date":"2020","source":"Acta pharmaceutica (Zagreb, Croatia)","url":"https://pubmed.ncbi.nlm.nih.gov/31955140","citation_count":9,"is_preprint":false},{"pmid":"35422912","id":"PMC_35422912","title":"SOX7 loss-of-function variation as a cause of familial congenital heart disease.","date":"2022","source":"American journal of translational research","url":"https://pubmed.ncbi.nlm.nih.gov/35422912","citation_count":9,"is_preprint":false},{"pmid":"26475439","id":"PMC_26475439","title":"Sox7 is dispensable for primitive endoderm differentiation from mouse ES cells.","date":"2015","source":"BMC developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/26475439","citation_count":9,"is_preprint":false},{"pmid":"35332412","id":"PMC_35332412","title":"LncRNA BACE1-AS promotes the progression of osteosarcoma through miR-762/SOX7 axis.","date":"2022","source":"Molecular biology 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functional transactivation domain identified and Wnt repression demonstrated, single lab\",\n      \"pmids\": [\"11691915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SOX7 and SOX17 bind to two SOX-binding sites within the parietal endoderm-specific enhancer of the mouse laminin alpha1 (Lama1) gene via their HMG boxes, and synergistically transactivate this enhancer in cooperation with ubiquitous factors Sp1/Sp3 and NF-Y.\",\n      \"method\": \"EMSA, mutational analysis, luciferase reporter assay, Northern blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro DNA binding (EMSA) combined with mutagenesis and reporter assays\",\n      \"pmids\": [\"15220343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SOX7 is a potent transcriptional activator of Fgf-3 through binding to the PS4A regulatory element of the Fgf-3 promoter; SOX7 competes with GATA-4 for PS4A occupancy, and siRNA-mediated knockdown of Sox7 abolishes Fgf-3 expression in GATA-4-deficient embryoid bodies.\",\n      \"method\": \"Luciferase reporter assay, nuclear extract binding, RNA interference, in situ hybridization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding competition shown with nuclear extracts, reporter assay, and functional knockdown\",\n      \"pmids\": [\"15082719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Sox7 silencing in F9 embryonal carcinoma cells inhibits retinoic acid/cAMP-induced upregulation of Gata-4 and Gata-6, and inhibits parietal endoderm differentiation; Sox7 acts upstream of Gata-4 and Gata-6, and overexpression of either GATA factor rescues differentiation in Sox7-silenced cells.\",\n      \"method\": \"siRNA knockdown, Western blot, morphological analysis, laminin-1 production assay, rescue overexpression\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined phenotype and rescue experiment, multiple orthogonal methods\",\n      \"pmids\": [\"15542856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In Xenopus, SOX7 and SOX18 are redundantly required for cardiogenesis; versions of SOX7 and SOX18 with their C-terminal β-catenin interaction domains replaced by a transcriptional activator still induce cardiogenesis, indicating the cardiogenic function is independent of β-catenin antagonism.\",\n      \"method\": \"Morpholino knockdown, RNA overexpression, domain-swap mutant injection, animal cap explant assay\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — domain mutagenesis with functional readout and reciprocal rescue experiments\",\n      \"pmids\": [\"16193513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Zebrafish sox7 and sox18 play redundant but collectively essential roles in establishing arteriovenous identity in endothelial cells; simultaneous morpholino knockdown of both genes causes multiple arteriovenous fusions with failure of venous endothelial cell differentiation, while endothelial cell specification is preserved.\",\n      \"method\": \"Morpholino knockdown, transgenic reporter lines, in situ hybridization for arterial/venous markers\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — double morphant epistasis with detailed molecular marker analysis; replicated in companion paper (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 expression; loss of both genes causes ectopic expression of venous marker Flt4 in the dorsal aorta and loss of artery-specific markers EphrinB2a and Gridlock.\",\n      \"method\": \"Morpholino double knockdown, in situ hybridization, transgenic reporter lines\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis placing Sox7/Sox18 upstream of Gridlock in arteriovenous specification, replicated finding\",\n      \"pmids\": [\"18377889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SOX7 protein physically interacts with β-catenin and suppresses β-catenin-mediated transcription by depleting active β-catenin; Sox7 promoter is hypermethylated in prostate and colorectal cancers, and ectopic SOX7 suppresses proliferation in colorectal cancer cells with endogenous mutant β-catenin.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay, bisulfite sequencing, cell proliferation/colony formation assays\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP showing direct protein interaction plus functional reporter assays and loss-of-function readout\",\n      \"pmids\": [\"18819930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Sox7 and Sox17 are strain-specific modifiers that can functionally substitute for Sox18 in lymphatic development in vitro and in vivo; they are not normally expressed during lymphatic development but are specifically upregulated in the absence of Sox18 function in permissive strains.\",\n      \"method\": \"In vitro functional substitution assay, in vivo genetic analysis across mouse strains, gene expression analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cross-strain genetic modifier analysis with functional in vitro and in vivo substitution tests\",\n      \"pmids\": [\"19515696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Sox7 sustained expression in earliest committed hematopoietic precursors (from mouse ES cell differentiation) promotes maintenance of multipotent, self-renewing status and blocks differentiation; removal of this block permits efficient differentiation to erythroid and myeloid lineages. Sox7 knockdown decreases formation of primitive erythroid and definitive hematopoietic progenitors.\",\n      \"method\": \"Inducible overexpression, siRNA knockdown, ES cell differentiation assay, colony forming assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — inducible gain/loss-of-function with defined hematopoietic phenotype\",\n      \"pmids\": [\"19801444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Sox7 and Sox15 both upregulate muscle precursor markers Pax3/7, Meox1, and Foxc1 in P19 cells, but only Sox7 is sufficient to drive full skeletal myocyte differentiation; Sox15 blocks progression past the precursor stage through sustained Msx1 and Id1 expression.\",\n      \"method\": \"Stable overexpression in P19 cells, qRT-PCR, immunofluorescence for myogenic markers, dominant-negative analysis\",\n      \"journal\": \"Stem cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function with defined molecular phenotype, single lab\",\n      \"pmids\": [\"19489079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SOX7 is expressed in haemogenic endothelium cells during haemangioblast differentiation and its enforced expression blocks further differentiation toward blood precursors while sustaining endothelial markers; SOX7 directly binds and activates the promoter of VE-cadherin, identifying it as a transcriptional target.\",\n      \"method\": \"Gain-of-function in mouse ES cell differentiation, chromatin immunoprecipitation (ChIP), promoter-reporter assay, flow cytometry\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct promoter binding by ChIP plus reporter assay and functional gain-of-function with defined cellular phenotype\",\n      \"pmids\": [\"22492353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Sox7 haploinsufficiency in mice causes anterior diaphragmatic hernias; SOX7 is expressed in vascular endothelial cells of the developing diaphragm. Complete Sox7 knockout leads to embryonic lethality with dilated pericardial sacs and failure of yolk sac remodeling indicating cardiovascular failure.\",\n      \"method\": \"Targeted gene deletion (exon 2), immunohistochemistry, phenotypic analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean knockout mouse model with specific developmental phenotype and localization data\",\n      \"pmids\": [\"22723016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ETV2 is a direct upstream transcriptional regulator of Sox7; ETV2 binds to ETV2 binding elements in the Sox7 upstream regulatory region and activates transcription. SOX7 overexpression mimics ETV2 in promoting endothelial progenitor cell formation and angiogenic sprouting, while Sox7 knockdown blocks ETV2-induced endothelial progenitor increases.\",\n      \"method\": \"ChIP of ETV2 at Sox7 regulatory region, reporter assay, overexpression and shRNA knockdown in embryoid bodies\",\n      \"journal\": \"Stem cells and development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct ChIP establishing ETV2 binding at Sox7 locus plus epistasis via knockdown\",\n      \"pmids\": [\"24762086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Combined deletion of Sox7, Sox17, and Sox18 in mouse retinal vascular endothelium leads to a dense capillary plexus with near-complete loss of radial arteries and veins; individual deletions have minimal effect due to overlapping function and reciprocal transcriptional regulation between Sox7 and Sox17.\",\n      \"method\": \"Conditional endothelial-specific gene deletion, retinal flatmount analysis, vascular smooth muscle cell coverage assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — triple conditional knockout with detailed vascular phenotyping, multiple orthogonal methods\",\n      \"pmids\": [\"26630461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In zebrafish, sox7 mutants display aberrant arteriovenous connections and arterial block; genetic interaction studies show sox7 works with hey2 and efnb2 for arterial specification, and overexpression of Notch intracellular domain rescues the sox7 mutant phenotype, placing Sox7 upstream of Notch in arterial development.\",\n      \"method\": \"Zebrafish genetic mutants, in vivo imaging, in situ hybridization, genetic epistasis/rescue with NICD overexpression\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with pathway rescue placing Sox7 upstream of Notch signaling\",\n      \"pmids\": [\"25834021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SOX7 directly binds β-catenin protein and inhibits Wnt/β-catenin transcriptional activity in AML cells; deletion of the β-catenin binding site in SOX7 significantly reduces its anti-leukemia effects, and SOX7 expression abrogates leukemia engraftment in xenograft transplantation.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion mutant, xenograft transplantation, reporter assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct protein binding shown by Co-IP with domain deletion providing mechanistic proof; functional xenograft validation\",\n      \"pmids\": [\"25940713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SOX7 directly interacts with RUNX1 and inhibits its transcriptional activity by hindering RUNX1 DNA binding and blocking the interaction between RUNX1 and its co-factor CBFβ; this mechanism regulates hemogenic endothelium differentiation in the yolk sac.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, single-cell expression profiling, immunofluorescence\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct protein-protein interaction shown by Co-IP with mechanistic follow-up showing disruption of RUNX1/CBFβ complex\",\n      \"pmids\": [\"27802172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SOX7 acts as a transcription factor to upregulate IL-33 in pericytes upon PDGF-BB stimulation; IL-33 is the highest upregulated gene following SOX7 activation, and this IL-33-ST2-dependent pathway promotes macrophage recruitment and cancer metastasis.\",\n      \"method\": \"Gain- and loss-of-function experiments, gene expression analysis, pharmacological inhibition of IL-33-ST2, xenograft mouse models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain/loss-of-function with defined downstream target and in vivo validation, single lab\",\n      \"pmids\": [\"27150562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Sox7 in tumor endothelial cells promotes VEGFR2 expression and vascular abnormality in high-grade glioma; Sox7 deletion suppressed VEGFR2 expression, while Sox17 deletion exacerbated abnormality by up-regulating Sox7.\",\n      \"method\": \"Endothelial conditional deletion, in vivo imaging, immunofluorescence, gene expression analysis\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional knockout with specific molecular target (VEGFR2) identified and reciprocal regulation with Sox17 demonstrated\",\n      \"pmids\": [\"29444818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX7 directly binds to the VE-cadherin gene promoter and up-regulates its expression in endothelial cells, thereby suppressing endothelial-to-mesenchymal transition (EndMT); luciferase and EMSA confirmed direct promoter binding, and VE-cadherin knockdown partly reverses SOX7-mediated repression of EndMT.\",\n      \"method\": \"Luciferase reporter assay, EMSA, collagen gel culture system, VE-cadherin knockdown rescue\",\n      \"journal\": \"Clinical science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct DNA binding confirmed by EMSA and luciferase with functional rescue experiment\",\n      \"pmids\": [\"33720353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sox7 is expressed in FLK1+ endothelial progenitors and its conditional deletion in FLK1+ cells leads to widespread vascular defects by E10.5 including disorganized endothelial cords instead of paired dorsal aorta; hematopoietic-specific (VAV-cre) deletion of Sox7 does not affect the hematopoietic system.\",\n      \"method\": \"FLK1-specific conditional knockout, VAV-specific conditional knockout, histological analysis of embryos from E7.5 to E10.5\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional knockouts defining the endothelial-specific requirement for SOX7\",\n      \"pmids\": [\"28577909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GATA4 specifically regulates Sox7 and Sox18 expression during cardiomyogenesis; knockdown of Gata4 reduces Sox7/Sox18 expression, and reinstating Sox7 or Sox18 partially rescues cardiomyocyte differentiation lost upon Gata4 knockdown; this axis is conserved between Xenopus and mouse ESCs.\",\n      \"method\": \"Genome-wide transcriptomics, morpholino knockdown, RNA rescue experiments, mouse ESC knockdown\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide transcriptomics combined with morpholino epistasis and cross-species conservation\",\n      \"pmids\": [\"29229250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX7 suppresses Wnt signaling by competing with BCL9 for binding to β-catenin; co-immunoprecipitation showed SOX7 binds β-catenin and disrupts the β-catenin/BCL9 interaction, thereby inhibiting β-catenin/TCF-mediated transcription.\",\n      \"method\": \"Co-immunoprecipitation, super TopFlash reporter assay\",\n      \"journal\": \"DNA and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP demonstrating competition mechanism, supported by reporter assay, single lab\",\n      \"pmids\": [\"29271667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sox7 regulates Sox7 expression in endothelial cells via ETS factor ETV2; Sox7 is required for endothelial cell VEGFR2 expression, angiogenic sprouting from embryoid bodies, and cardiovascular development.\",\n      \"method\": \"Inducible expression, ChIP at Sox7 regulatory region, shRNA knockdown in EBs\",\n      \"journal\": \"Stem cells and development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct ChIP establishing regulatory region occupancy plus epistasis\",\n      \"pmids\": [\"24762086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sox7 directly represses PSMA/FOLH1 expression by binding to SOX box sites #2 and #4 within the PSMA enhancer (PSME); the nuclear localization signal (NLS) regions of SOX7, but not its β-catenin-interacting motif, are essential for this suppressive activity.\",\n      \"method\": \"ChIP, EMSA, luciferase reporter assay, Sox7 NLS mutant, stable expression in prostate cancer cells\",\n      \"journal\": \"The Prostate\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct DNA binding by ChIP and EMSA, mutagenesis of binding sites and NLS domain, functional validation\",\n      \"pmids\": [\"30488457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOX7 is identified as a transcriptional repressor of the Hepatitis B virus core promoter (HBVCP); SOX7 binds specifically to the HBVCP via its HMG box and competitively displaces hepatocyte nuclear factor 4α, inhibiting pgRNA synthesis, HBcAg and cccDNA accumulation.\",\n      \"method\": \"EMSA, luciferase reporter assay, HBV replicon and infection models, stapled peptide experiments\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — EMSA for direct DNA binding plus functional reporter assays and infection models with peptide mimetics\",\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; treatment with proteasome inhibitor MG132/bortezomib or p-ERK/MEK inhibitor U0126 attenuates SOX7-promoted BIM degradation.\",\n      \"method\": \"Gene expression profiling, pharmacological inhibition (MG132, bortezomib, U0126), Western blot, loss-of-function\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway identified via pharmacological dissection, single lab\",\n      \"pmids\": [\"31332289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SOX7 validated target genes in breast cancer cells include SPRY1 and SLIT2 (SOX7-activated) and TRIB3 and MTHFD2 (SOX7-repressed); these were identified by microarray combined with ChIP validation and confirmed to differentially contribute to tumor suppression.\",\n      \"method\": \"Microarray gene expression profiling, ChIP assay, qPCR validation\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct chromatin binding by ChIP plus expression validation, single lab\",\n      \"pmids\": [\"29757932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SOX7 is required for muscle satellite cell development and maintenance; conditional knockout of Sox7 in PAX3+ cells reduces satellite cell population from birth, reduces myofiber caliber, impairs regeneration after injury, and increases sensitivity to apoptosis; SOX7-deficient primary myoblasts show impaired myoblast fusion.\",\n      \"method\": \"Conditional PAX3-Cre knockout mouse, satellite cell quantification, injury-induced regeneration assay, primary myoblast culture\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional knockout mouse model with defined phenotypic readouts across multiple assays\",\n      \"pmids\": [\"28943254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sox7 enforced expression in adult bone marrow progenitors promotes proliferation of multi-lineage short-term engrafting blood progenitors and induces a profound block in B lymphocyte generation both ex vivo and in vivo, causing extra-medullary hematopoiesis in spleen and liver.\",\n      \"method\": \"Inducible transgenic mouse model, bone marrow/stroma co-culture, transplantation assay, FACS\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — inducible transgenic model with in vivo and ex vivo functional hematopoietic readouts\",\n      \"pmids\": [\"27411892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sox7 promotes endothelial cell activation via the Jagged1-Notch1 pathway upon HLA I antibody stimulation; Sox7 knockdown reduces adhesion molecules (VCAM-1, ICAM-1), inflammatory cytokines (IL-6, TNF-α), and Jagged1-Notch1 signaling; Jagged1 overexpression rescues the effect of Sox7 knockdown.\",\n      \"method\": \"shRNA knockdown, Notch pathway inhibition (DAPT), Jagged1 overexpression rescue, in vivo kidney transplantation model\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — knockdown with pathway inhibition and rescue experiment, in vivo validation, single lab\",\n      \"pmids\": [\"30639059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sox7 regulates lineage decisions in cardiovascular progenitor cells by promoting endothelial cell fate at the expense of cardiac lineage; ChIP-Seq combined with ATAC-Seq identified Sox7 target genes; SOX7 directly protein-protein interacts with GATA4 and interferes with GATA4 transcriptional activity on cardiac genes; Sox7 modulates WNT and BMP signaling during cardiovascular differentiation.\",\n      \"method\": \"ChIP-Seq, ATAC-Seq, transcriptomics, Co-immunoprecipitation (SOX7-GATA4 interaction), doxycycline-inducible overexpression\",\n      \"journal\": \"Stem cells and development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genome-wide ChIP-Seq plus Co-IP for protein interaction and multi-omics integration\",\n      \"pmids\": [\"31154937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SOX7 is rapidly and transiently upregulated in human endothelial cells during hypoxia and is required for hypoxia-induced angiogenesis; SOX7 depletion impairs angiogenic response in cultured primary human umbilical vein endothelial cells.\",\n      \"method\": \"RNA-Seq temporal profiling, siRNA knockdown, tube formation and sprouting angiogenesis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transcriptomics combined with functional knockdown, single lab\",\n      \"pmids\": [\"32071080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Sox7 deficiency in mouse atrioventricular canal reduces Bmp2 in myocardium and Wnt4 in endocardium; Sox7 directly binds to the Wnt4 and Bmp2 promoters; exogenous WNT4 or BMP2 partially rescues impaired endothelial-to-mesenchymal transition (EndMT) caused by Sox7 deficiency, with BMP2 acting downstream of WNT4.\",\n      \"method\": \"Conditional knockout mouse, transcriptome analysis, ChIP/direct promoter binding assays, protein rescue experiments, Noggin inhibition\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct DNA binding plus epistasis rescue experiments defining Wnt4-Bmp2 pathway downstream of Sox7\",\n      \"pmids\": [\"33846290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss-of-function SOX7 mutation (Gln104*) fails to transactivate target genes GATA4 and BMP2 and invalidates cooperative transactivation with NKX2.5, as demonstrated by dual-luciferase reporter analysis; this mutation co-segregates with congenital heart disease in a pedigree.\",\n      \"method\": \"Dual-luciferase reporter assay, whole-exome sequencing, Sanger sequencing\",\n      \"journal\": \"American journal of translational research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional reporter assay with disease-segregating variant, single lab\",\n      \"pmids\": [\"35422912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SOX7 in blood vascular endothelial cells non-cell-autonomously patterns lymphatic vessels by directly repressing VEGFC transcription at distant regulatory regions; SOX7 also directly binds HEY1 (a canonical Notch pathway repressor), suggesting recruitment of HEY1 to VEGFC genomic regulatory regions as a mechanism of transcriptional repression.\",\n      \"method\": \"Conditional loss-of-function in mice, identification of distant regulatory regions, direct binding assay, Co-IP for SOX7-HEY1 interaction\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional knockout with identification of direct regulatory targets and protein-protein interaction, in vivo lymphatic phenotype\",\n      \"pmids\": [\"36715213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Endothelial-specific loss of Sox7 in mice leads to ventricular non-compaction-like defects and abnormal coronary artery formation; Sox7 loss disrupts transcriptional regulation of Notch pathway genes and connexins 37 and 40, which govern coronary arterial specification; a subset of Sox7-null endothelial cells transdifferentiate into hematopoietic lineages.\",\n      \"method\": \"Endothelial-specific conditional knockout, single-nuclei transcriptomics, fate mapping, immunofluorescence\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional knockout with single-nucleus transcriptomics and fate mapping providing multi-level mechanistic insight\",\n      \"pmids\": [\"37551717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SOX7 co-localizes with mutant β-catenin or TCF4 in the nucleus and physically interacts with both wild-type and mutant β-catenin as well as TCF4; SOX7 inhibits TCF/LEF-1-dependent transcription induced by Wnt-1 and suppresses Wnt targets Cyclin D1 and c-Myc in endometrial cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescent microscopy, luciferase reporter assay, Western blot\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP demonstrating direct interaction with β-catenin and TCF4, supported by colocalization and reporter assays\",\n      \"pmids\": [\"23295859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SOX7 binds to the promoter of DNMT3B and transcriptionally represses it, leading to reduced methylation of the CYGB promoter and inhibition of bladder cancer progression; the SOX7/DNMT3B/CYGB axis was validated by ChIP and functional experiments.\",\n      \"method\": \"ChIP assay, Western blot, RNA-seq, immunohistochemistry, knockdown and overexpression experiments in BCa cell lines\",\n      \"journal\": \"Molecular biomedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct promoter binding by ChIP with functional downstream methylation consequence, single lab\",\n      \"pmids\": [\"39227479\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SOX7 is a transcription factor (SoxF family, HMG-box) that binds DNA at SOX consensus sites to activate or repress target genes (including VE-cadherin, VEGFC, Fgf-3, PSMA, Bmp2, Wnt4, GATA4, SPRY1, SLIT2), forms protein complexes with β-catenin, TCF4, RUNX1, GATA4, BCL9, and HEY1 to modulate Wnt/β-catenin, Notch, and hematopoietic transcriptional programs, acts redundantly with Sox17/Sox18 to establish arteriovenous identity, and functions as a context-dependent regulator of endothelial cell identity, haemogenic endothelium-to-blood transition, vascular and cardiac development, and tumor suppression across multiple cancer types primarily through inhibition of the Wnt/β-catenin pathway.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SOX7 is a SoxF-family HMG-box transcription factor that governs endothelial cell identity, arteriovenous specification, cardiovascular morphogenesis, and the endothelial-to-hematopoietic transition, while also acting as a context-dependent tumor suppressor. SOX7 binds SOX consensus motifs via its HMG box to directly activate endothelial genes (VE-cadherin, VEGFR2) and repress targets such as VEGFC, PSMA, and DNMT3B, and it physically interacts with β-catenin to suppress Wnt/β-catenin transcription by competing with BCL9 and disrupting TCF4-mediated gene activation [PMID:18819930, PMID:29271667, PMID:23295859]. In vascular development, SOX7 functions redundantly with SOX17 and SOX18 to establish arterial identity and pattern lymphatic vessels, acting upstream of Notch signaling, and its endothelial-specific deletion causes arteriovenous malformations, coronary artery defects, and ventricular non-compaction [PMID:18094332, PMID:25834021, PMID:37551717, PMID:36715213]. SOX7 also directly interacts with RUNX1 to block the haemogenic endothelium-to-blood transition, interacts with GATA4 to balance endothelial versus cardiac progenitor fate, and regulates Wnt4/Bmp2 signaling in atrioventricular cushion development; loss-of-function SOX7 mutations co-segregate with congenital heart disease [PMID:27802172, PMID:31154937, PMID:33846290, PMID:35422912].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Identifying SOX7 as a transcription factor with an intrinsic transactivation domain that can repress Wnt/β-catenin signaling established its dual capacity as activator and repressor.\",\n      \"evidence\": \"Transactivation domain mapping and Wnt reporter assays\",\n      \"pmids\": [\"11691915\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of Wnt repression not defined at the protein-interaction level\", \"No endogenous target genes identified\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstration that SOX7 directly binds DNA at SOX sites to activate Lama1 and Fgf-3 promoters, and that it acts upstream of GATA-4/GATA-6 in parietal endoderm differentiation, defined its earliest transcriptional targets and placed it in an endoderm differentiation hierarchy.\",\n      \"evidence\": \"EMSA, mutagenesis, reporter assays, siRNA knockdown in F9 cells with rescue by GATA factors\",\n      \"pmids\": [\"15220343\", \"15082719\", \"15542856\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide binding profile not yet determined\", \"In vivo relevance in mouse embryos not tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showing that SOX7 and SOX18 redundantly drive cardiogenesis in Xenopus through a β-catenin-independent mechanism revealed that SOX7's transcriptional activator function, not just Wnt antagonism, underlies heart development.\",\n      \"evidence\": \"Morpholino knockdown and domain-swap mutant injection in Xenopus animal cap explants\",\n      \"pmids\": [\"16193513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian cardiogenic function not yet confirmed\", \"Direct cardiac target genes unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery that combined loss of sox7 and sox18 in zebrafish causes arteriovenous fusions established that SoxF factors are collectively essential for arteriovenous specification while individually redundant.\",\n      \"evidence\": \"Morpholino double knockdown in zebrafish with arterial/venous marker analysis\",\n      \"pmids\": [\"18094332\", \"18377889\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets mediating arteriovenous identity not identified\", \"Mechanism of venous repression unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Physical interaction between SOX7 and β-catenin, combined with SOX7 promoter hypermethylation in cancers, provided the first mechanistic basis for SOX7 as a Wnt pathway antagonist and tumor suppressor.\",\n      \"evidence\": \"Co-immunoprecipitation, bisulfite sequencing, colony formation assays in colorectal cancer cells\",\n      \"pmids\": [\"18819930\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise binding interface on β-catenin not mapped\", \"In vivo tumor suppression not demonstrated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Functional substitution experiments showed Sox7 can replace Sox18 in lymphatic development, and enforced Sox7 expression in hematopoietic progenitors blocks differentiation while maintaining multipotency, defining its roles in lymphatic and hematopoietic fate.\",\n      \"evidence\": \"Cross-strain genetic analysis in mice; inducible overexpression and siRNA in ES cell hematopoietic differentiation\",\n      \"pmids\": [\"19515696\", \"19801444\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets in hematopoietic progenitors not identified\", \"Mechanism by which Sox7 maintains multipotency unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"ChIP-confirmed direct binding of SOX7 to the VE-cadherin promoter in haemogenic endothelium, plus SOX7 knockout lethality with cardiovascular failure, established SOX7 as a direct transcriptional regulator of endothelial identity essential for vascular development.\",\n      \"evidence\": \"ChIP and reporter assays in ES-derived haemogenic endothelium; targeted gene deletion in mouse with embryonic lethal phenotype\",\n      \"pmids\": [\"22492353\", \"22723016\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide ChIP-Seq targets not yet mapped\", \"Relationship between VE-cadherin activation and vascular remodeling failure not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showing SOX7 interacts with both β-catenin and TCF4 and suppresses Wnt target genes Cyclin D1 and c-Myc extended the Wnt antagonism mechanism to include disruption of the β-catenin/TCF transcription complex.\",\n      \"evidence\": \"Co-immunoprecipitation, immunofluorescence colocalization, reporter assays in endometrial cancer cells\",\n      \"pmids\": [\"23295859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SOX7 displaces TCF4 from DNA or forms a ternary inhibitory complex not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Genetic epistasis placing sox7 upstream of Notch (hey2, efnb2) in zebrafish arterial specification, and triple SoxF deletion causing near-complete loss of retinal arteries and veins, defined the pathway hierarchy and full extent of SoxF redundancy in vascular patterning.\",\n      \"evidence\": \"Zebrafish genetic mutants with NICD rescue; conditional triple knockout in mouse retinal endothelium\",\n      \"pmids\": [\"25834021\", \"26630461\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SOX7 directly activates Notch ligand/receptor transcription or acts indirectly not resolved\", \"Mechanisms of reciprocal transcriptional regulation between Sox7 and Sox17 unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Domain deletion showing that the β-catenin binding site in SOX7 is required for anti-leukemia effects, and xenograft validation, provided the first in vivo evidence that Wnt antagonism is the primary tumor-suppressive mechanism of SOX7 in AML.\",\n      \"evidence\": \"Co-IP with domain deletion mutant, xenograft transplantation in AML\",\n      \"pmids\": [\"25940713\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous AML target genes downstream of SOX7-mediated Wnt suppression not identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovery that SOX7 physically binds RUNX1, prevents RUNX1-CBFβ complex formation, and thereby blocks the haemogenic endothelium-to-blood transition revealed a protein-protein interaction mechanism distinct from SOX7's DNA-binding function.\",\n      \"evidence\": \"Co-immunoprecipitation, ChIP, single-cell expression profiling in yolk sac\",\n      \"pmids\": [\"27802172\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of SOX7-RUNX1 interaction not determined\", \"Whether SOX7 also directly represses RUNX1 target genes via DNA binding unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Multiple studies refined SOX7's mechanism: competition with BCL9 for β-catenin binding explained Wnt antagonism specificity; ChIP-Seq/ATAC-Seq mapped genome-wide targets and confirmed SOX7-GATA4 protein interaction in cardiovascular progenitor fate; and direct repression of PSMA enhancer was mapped to specific SOX box sites.\",\n      \"evidence\": \"Co-IP for BCL9 competition; ChIP-Seq, ATAC-Seq, and transcriptomics in cardiovascular progenitors; ChIP and EMSA at PSMA enhancer\",\n      \"pmids\": [\"29271667\", \"31154937\", \"30488457\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural model of SOX7-β-catenin-BCL9 competition not available\", \"How SOX7-GATA4 interaction partitions target gene sets not fully resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Conditional knockout in PAX3+ cells demonstrated SOX7 is required for muscle satellite cell maintenance and myoblast fusion, extending its function beyond endothelium to skeletal muscle stem cells.\",\n      \"evidence\": \"Conditional PAX3-Cre knockout mouse with satellite cell quantification, injury-regeneration assay, primary myoblast culture\",\n      \"pmids\": [\"28943254\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets in satellite cells not identified\", \"Relationship to Wnt or Notch pathways in this context not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of Wnt4 and Bmp2 as direct SOX7 targets in atrioventricular cushion development, with BMP2 acting downstream of WNT4, defined the signaling cascade by which SOX7 controls endothelial-to-mesenchymal transition in heart valve formation.\",\n      \"evidence\": \"Conditional knockout mouse, ChIP at Wnt4 and Bmp2 promoters, protein rescue and Noggin inhibition\",\n      \"pmids\": [\"33846290\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this Wnt4-Bmp2 axis operates in other SOX7-dependent developmental contexts unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Discovery that SOX7 in blood vascular endothelium non-cell-autonomously patterns lymphatic vessels by repressing VEGFC via recruitment of HEY1 to distant regulatory regions revealed a novel mechanism linking SOX7 to Notch effector-mediated transcriptional repression.\",\n      \"evidence\": \"Conditional loss-of-function in mice, identification of distant VEGFC regulatory regions, Co-IP for SOX7-HEY1 interaction\",\n      \"pmids\": [\"36715213\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HEY1 recruitment is the sole mechanism of VEGFC repression not established\", \"Genome-wide extent of SOX7-HEY1 co-regulation unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Single-nucleus transcriptomics after endothelial Sox7 loss revealed dysregulated Notch pathway genes and connexins 37/40 in coronary endothelium, and fate mapping showed transdifferentiation of Sox7-null endothelial cells into hematopoietic lineages, unifying SOX7's roles in arterial specification, coronary development, and endothelial-hematopoietic fate restriction.\",\n      \"evidence\": \"Endothelial-specific conditional knockout with single-nuclei transcriptomics and fate mapping\",\n      \"pmids\": [\"37551717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic link between connexin downregulation and non-compaction phenotype not established\", \"Whether transdifferentiation occurs via de-repression of RUNX1 pathway not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of SOX7's protein-protein interactions (with β-catenin, RUNX1, GATA4, HEY1) remains unresolved, and it is unknown how SOX7 integrates its activator and repressor functions at distinct genomic loci in a cell-type-specific manner.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of SOX7 or its complexes\", \"Cell-type-specific chromatin context determining activation versus repression not defined\", \"Post-translational regulation of SOX7 activity largely unexplored\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 2, 11, 20, 25, 26, 34, 36]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 2, 3, 11, 20, 25, 26, 28, 34, 39]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 16, 17, 23, 38]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [25, 38]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [0, 7, 16, 23, 34, 38]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 5, 6, 12, 14, 15, 21, 22, 34, 37]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 2, 11, 20, 25, 26, 28, 36, 39]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CTNNB1\", \"TCF4\", \"RUNX1\", \"GATA4\", \"BCL9\", \"HEY1\", \"NKX2-5\", \"SOX17\"],\n    \"other_free_text\": []\n  }\n}\n```"}