{"gene":"NR2F2","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":2005,"finding":"COUP-TFII (NR2F2) is specifically expressed in venous (not arterial) endothelium and represses Notch signaling to maintain vein identity; endothelial-specific ablation causes veins to acquire arterial characteristics including NP-1 and Notch signaling molecules, while ectopic expression causes vein-artery fusion.","method":"Conditional endothelial-specific knockout and transgenic overexpression in mice; arterial/venous marker analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — clean conditional KO and gain-of-function with defined molecular phenotype, replicated across multiple approaches in a high-impact study","pmids":["15875024"],"is_preprint":false},{"year":1999,"finding":"COUP-TFII is required for angiogenesis and heart (atria/sinus venosus) development; COUP-TFII mutants fail to remodel the primitive capillary plexus and show downregulation of Angiopoietin-1, suggesting COUP-TFII is required for mesenchymal-endothelial signaling.","method":"Targeted gene deletion in mice; in situ hybridization and morphological analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — complete KO with defined cardiovascular phenotype and identified downstream target (Ang-1), foundational study with 437 citations","pmids":["10215630"],"is_preprint":false},{"year":2008,"finding":"Crystal structure of the human COUP-TFII ligand-binding domain (1.48 Å) reveals an autorepressed conformation where helix α10 is bent into the ligand-binding pocket and the AF-2 helix is folded into the cofactor binding site. Retinoic acids promote COUP-TFII to recruit coactivators and activate transcription, releasing it from autorepression. Mutations disrupting cofactor binding, dimerization, or ligand binding substantially reduce transcriptional activity.","method":"X-ray crystallography; cell-based transcription assays; site-directed mutagenesis","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure combined with mutagenesis and functional assays in multiple cell lines","pmids":["18798693"],"is_preprint":false},{"year":2008,"finding":"COUP-TFII physically interacts with Prox1 to form a stable complex in lymphatic endothelial cells (LECs), and this complex functions as a coregulator to control LEC lineage-specific genes including VEGFR-3, FGFR-3, and neuropilin-1, thereby specifying LEC fate.","method":"Co-immunoprecipitation; functional gene expression analysis in LECs","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP demonstrating physical interaction, combined with functional gene regulation data","pmids":["18815287"],"is_preprint":false},{"year":2010,"finding":"COUP-TFII directly stimulates expression of neuropilin-2 (a VEGF-C coreceptor) to enhance pro-lymphangiogenic VEGF-C actions; conditional ablation at early embryonic stage blocks pre-lymphatic EC formation, while late ablation causes loss of LEC identity and gain of blood EC fate.","method":"Conditional knockout mouse models; siRNA knockdown in primary human LECs; ChIP assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple conditional KO models at different developmental stages, ChIP demonstrating direct target regulation, and human cell validation","pmids":["20364082"],"is_preprint":false},{"year":2013,"finding":"COUP-TFII homodimers inhibit arterial differentiation in venous ECs by directly binding to promoter regions of Notch target genes HEY1 and HEY2, whereas COUP-TFII/PROX1 heterodimers lack this inhibitory effect and instead induce LEC-specific gene expression, defining a molecular switch between venous and lymphatic EC identity.","method":"ChIP assays; promoter binding analysis; gain- and loss-of-function experiments; Co-IP","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP demonstrates direct promoter binding, Co-IP confirms heterodimerization, functional consequence defined","pmids":["23345397"],"is_preprint":false},{"year":2013,"finding":"Cardiomyocyte-specific COUP-TFII ablation produces ventricularized atria with ventricle-like action potentials, increased cardiomyocyte size, and T tubules; ChIP in E13.5 atria identified Tbx5, Hey2, Irx4, MLC2v, MLC2a, and MLC1a as direct COUP-TFII targets, establishing COUP-TFII as a determinant of atrial identity.","method":"Cardiomyocyte-specific conditional KO; chromatin immunoprecipitation; electrophysiology; genome-wide expression analysis","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1-2 — conditional KO with functional electrophysiological readout combined with ChIP identification of direct targets","pmids":["23725765"],"is_preprint":false},{"year":2012,"finding":"COUP-TFII directly regulates E2F1 transcription by tethering to Sp1 binding sites in the E2F1 promoter (shown by ChIP), thereby modulating cell cycle and proliferation; it also directly targets Foxc1, NP-1 (upstream Notch genes) and Hey2 (downstream Notch effector), and suppresses EphrinB2 while enhancing EphB4 expression to regulate venous identity.","method":"Microarray; chromatin immunoprecipitation; siRNA knockdown in HUVECs","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP demonstrates direct binding with functional validation of cell cycle and Notch pathway targets","pmids":["22734039"],"is_preprint":false},{"year":1995,"finding":"COUP-TFII (ARP-1) represses Oct-3/4 promoter activity through the RAREoct element in a dose-dependent manner, with the C-terminal domain harboring the silencing region. COUP-TFII binds RAREoct with higher affinity than RAR:RXR heterodimers and can compete with and displace RAR:RXR to actively silence the Oct-3/4 promoter.","method":"Reporter assays; EMSA; deletion mutagenesis; competition binding assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro binding assays with mutagenesis plus reporter assays, mechanistic competition demonstrated","pmids":["7823919"],"is_preprint":false},{"year":2010,"finding":"COUP-TFII directly represses Notch signaling to suppress NP-1 in veins; in the undifferentiated hESC state, OCT4 and OCT4-induced miR-302 directly repress NR2F2 transcriptionally and post-transcriptionally respectively; conversely NR2F2 directly inhibits OCT4 during differentiation, creating a positive feedback loop for its own expression.","method":"Luciferase reporter assays; ChIP; miRNA overexpression and knockdown; siRNA in hESCs","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (ChIP, reporter assays, loss/gain of function) establishing bidirectional regulatory circuit","pmids":["21151097"],"is_preprint":false},{"year":2013,"finding":"COUP-TFII directly regulates neuropilin-1 and neuropilin-2 gene expression in the developing amygdala; ChIP assays confirmed Nrp1 and Nrp2 as direct COUP-TFII targets in the telencephalon in vivo; loss of COUP-TFII in CGE-derived cells impairs migration of Pax6+ cells into the basomedial amygdala nucleus.","method":"Conditional KO (Rx-Cre); ChIP; molecular marker analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — in vivo ChIP plus conditional KO with defined migratory phenotype","pmids":["22492355"],"is_preprint":false},{"year":2008,"finding":"COUP-TFII is required and sufficient for CGE-derived cortical interneuron caudal migration; knockdown inhibits caudal migration while ectopic expression in MGE cells redirects their migration caudally when transplanted into the CGE environment.","method":"Transcriptome comparison; transplantation assays; RNAi knockdown in mouse brain","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — gain- and loss-of-function transplantation experiments establishing both necessity and sufficiency","pmids":["19074032"],"is_preprint":false},{"year":2008,"finding":"COUP-TFII is essential for Leydig cell differentiation; conditional pre-pubertal ablation arrests Leydig cells at the progenitor stage, causing testosterone deficiency and infertility; testosterone administration rescues spermatogenetic defects, but Leydig cell maturation requires COUP-TFII itself, as testosterone cannot substitute for it.","method":"Tamoxifen-inducible Cre conditional KO; testosterone rescue experiments; histology","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — inducible conditional KO with hormone rescue experiment, clearly separating COUP-TFII's role in differentiation from maintenance","pmids":["18818749"],"is_preprint":false},{"year":2000,"finding":"COUP-TFII synergistically activates transcription of the CYP7A1 (cholesterol 7α-hydroxylase) promoter together with HNF4; COUP-TFII binds adjacent DR0 element and interacts with HNF4 through protein-protein interactions facilitated by juxtaposed binding elements.","method":"Transient transfection reporter assays; EMSA with in vitro-translated COUP-TFII; cotransfection in HepG2 cells","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro binding (EMSA) combined with reporter assays and mutagenesis demonstrating protein-protein interaction mechanism","pmids":["10627496"],"is_preprint":false},{"year":2010,"finding":"COUP-TFII suppression of ERα activity is required for successful embryo implantation and uterine decidualization; administration of ERα antagonist ICI 182,780 rescues implantation defects in uterine COUP-TFII knockout mice and restores Wnt4 and BMP2 expression.","method":"Uterine conditional KO (PR-Cre); ERα antagonist rescue experiment; gene expression analysis","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with pharmacological rescue establishing epistatic relationship between COUP-TFII and ERα","pmids":["20219888"],"is_preprint":false},{"year":2010,"finding":"COUP-TFII directly regulates Angiopoietin-1 transcription in pericytes to enhance tumor neoangiogenesis; conditional adult ablation of COUP-TFII severely compromises neoangiogenesis and suppresses tumor growth; provision of Angiopoietin-1 partially restores angiogenic defects in COUP-TFII-deficient mice.","method":"Conditional adult KO; xenograft and spontaneous tumor models; Ang-1 rescue experiment; ChIP","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — conditional adult KO with defined molecular target and rescue experiment confirming pathway","pmids":["20133706"],"is_preprint":false},{"year":2005,"finding":"COUP-TFII is expressed in foregut mesenchyme and its ablation in the posthepatic mesenchymal plate causes Bochdalek-type congenital diaphragmatic hernia through failure of diaphragm formation and attachment to body wall.","method":"Tissue-specific conditional KO (foregut mesenchyme Cre); morphological and histological analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific conditional KO establishing required role in diaphragm formation","pmids":["16251273"],"is_preprint":false},{"year":2005,"finding":"COUP-TFII in gastric mesenchyme is required for radial and anteroposterior stomach patterning; COUP-TFII acts downstream of hedgehog signaling in the stomach mesenchyme, as cyclopamine treatment downregulates COUP-TFII expression.","method":"Conditional KO (Nkx3-2-Cre); organ culture with cyclopamine; X-gal staining of lacZ knockin","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with organ culture demonstrating Hh pathway epistasis","pmids":["15829524"],"is_preprint":false},{"year":2007,"finding":"Uterine stromal/smooth muscle COUP-TFII is required for proper placentation; deletion increases trophoblast giant cell differentiation, reduces spongiotrophoblast layer, and causes absence of labyrinth formation with impaired placental vascularization.","method":"Conditional KO (uterine stromal Cre/loxP); histological analysis of placentation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined cellular and morphological phenotype in placenta","pmids":["17404209"],"is_preprint":false},{"year":2015,"finding":"COUP-TFII represses genes critical for mitochondrial electron transport chain enzyme activity, oxidative stress detoxification, mitochondrial dynamics, and the PGC-1 network, resulting in increased ROS, decreased oxygen consumption, and reduced glucose/oleate oxidation, leading to dilated cardiomyopathy.","method":"Cardiac-specific transgenic overexpression; mitochondrial function assays; gene expression profiling; calcineurin transgenic cross for haploinsufficiency rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — gain-of-function transgenics with mitochondrial functional readouts and genetic rescue by haploinsufficiency","pmids":["26356605"],"is_preprint":false},{"year":2017,"finding":"COUP-TFII in the Wolffian duct mesenchyme actively promotes elimination of male reproductive tracts in female embryos; COUP-TFII loss causes retention of Wolffian ducts independent of androgen; instead, enhanced phospho-ERK signaling in Wolffian duct epithelium mediates the retention via mesenchyme-epithelium cross-talk.","method":"Conditional KO in Wolffian duct mesenchyme; androgen receptor manipulation; phospho-ERK analysis","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with epistasis analysis distinguishing androgen-dependent vs. independent mechanisms","pmids":["28818950"],"is_preprint":false},{"year":2013,"finding":"BRG1 chromatin-remodeling enzyme directly promotes COUP-TFII expression in venous endothelial cells by binding conserved regulatory elements in the COUP-TFII promoter and remodeling chromatin accessibility; BRG1 endothelial deletion downregulates COUP-TFII and causes aberrant arterial marker expression on veins.","method":"Endothelial-specific conditional KO of Brg1; ChIP for BRG1 at COUP-TFII promoter; chromatin accessibility analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — conditional KO combined with ChIP demonstrating direct chromatin-level regulation of COUP-TFII","pmids":["23406903"],"is_preprint":false},{"year":2016,"finding":"Tie2 signaling maintains COUP-TFII protein stability via Akt-mediated phosphorylation; Tie2 knockdown or PI3K/Akt pathway blockade reduces COUP-TFII protein levels, while proteasome inhibition restores COUP-TFII, indicating that Tie2/Akt signaling prevents proteasomal degradation of COUP-TFII to maintain venous identity.","method":"Conditional Tek KO in mice; Ang-1 stimulation; Tie2 knockdown; proteasome inhibitor rescue in cultured ECs","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic and pharmacological approaches with defined proteasomal degradation mechanism","pmids":["28005008"],"is_preprint":false},{"year":2014,"finding":"NR2F2 directly activates Star (steroidogenic acute regulatory protein) gene expression in Leydig cells by binding to a DR1-like element between -131 and -95 bp of the Star promoter; NR2F2 knockdown reduces STAR mRNA/protein and basal steroid production; DR1 mutations that prevent NR2F2 binding blunt promoter activation.","method":"siRNA knockdown; promoter deletion constructs; ChIP; site-directed mutagenesis in Leydig cell lines","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP plus promoter deletion analysis plus mutagenesis of binding site in relevant cell type","pmids":["24899578"],"is_preprint":false},{"year":2012,"finding":"COUP-TFII is required for metanephric mesenchyme specification and kidney precursor cell survival; conditional ablation at E7.5 results in loss of Eya1, Six2, Pax2, and Gdnf expression; COUP-TFII directly regulates both Eya1 and Wt1 expression in metanephric mesenchyme as shown by ChIP.","method":"Conditional KO; ChIP; gene expression analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with ChIP-identified direct targets in vivo","pmids":["22669823"],"is_preprint":false},{"year":2008,"finding":"COUP-TFII regulates postnatal cerebellar growth and maturation by directly regulating IGF-1 expression in a Sp1-dependent manner (shown by ChIP); COUP-TFII knockout in brain reduces GCP proliferation, increases apoptosis, and decreases Akt1, GSK-3β, and mTOR activities downstream of IGF-1.","method":"NSE-Cre conditional KO; ChIP; IGF-1 pathway analysis; proliferation and apoptosis assays","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with ChIP showing direct IGF-1 regulation and downstream signaling pathway analysis","pmids":["19041640"],"is_preprint":false},{"year":2015,"finding":"COUP-TFII overexpression in satellite cells causes Duchenne-like dystrophy with regenerative failure due to deficient satellite cell proliferation and myoblast fusion; COUP-TFII transcriptionally represses promyogenic fusion factors including Npnt, Itgb1D, and Cav3, and reduces activation of focal adhesion kinase (FAK).","method":"Satellite cell-specific transgenic overexpression; dystrophin-deficient mouse cross; gene expression and FAK activation analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — gain-of-function in vivo model with defined molecular targets and signaling pathway readout","pmids":["27617862"],"is_preprint":false},{"year":2016,"finding":"miR-101 and miR-27a negatively regulate COUP-TFII; COUP-TFII in turn drives a FOXM1-CENPF transcriptional cascade to promote prostate cancer metastasis; COUP-TFII loss decreases FOXM1 and CENPF expression and invasion, while this axis also contributes to enzalutamide resistance.","method":"miRNA overexpression/knockdown; shRNA; clinical dataset correlation; invasion assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2-3 — functional validation of regulatory axis but primarily in cell lines without full mechanistic reconstitution","pmids":["27108958"],"is_preprint":false},{"year":2004,"finding":"Glucocorticoid receptor (GR) physically interacts with COUP-TFII; GR stimulates COUP-TFII-induced transactivation via its AF-1 domain attracting coactivators, while COUP-TFII represses GR-governed transcription by tethering SMRT and NCoR corepressors via its C-terminal domain.","method":"Co-immunoprecipitation; transactivation reporter assays; domain deletion analysis","journal":"Annals of the New York Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP demonstrating physical interaction with defined domain requirements and bidirectional functional consequence","pmids":["15265774"],"is_preprint":false},{"year":2016,"finding":"COUP-TFII represses myoblast fusion during skeletal muscle development by transcriptionally repressing Npnt, Itgb1D, and Cav3; elevated COUP-TFII in myogenic precursors results in inefficient muscle development and reduced FAK activation.","method":"Transgenic myogenic precursor-specific overexpression; in vitro differentiation assays; gene expression analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2-3 — gain-of-function in vivo and in vitro with defined target genes but no direct ChIP confirmation of binding","pmids":["28600496"],"is_preprint":false},{"year":2012,"finding":"COUP-TFII controls pancreatic β-cell mass by inducing β-catenin gene expression and its targets (cyclin D1, axin 2); GLP-1-induced activation of β-catenin pathway is impaired in COUP-TFII-deficient islets; COUP-TFII expression is positively regulated by TCF7L2 in a feedback loop.","method":"Pdx1-Cre conditional KO; islet isolation and culture; gain/loss of function in β-cells; gene expression analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2-3 — conditional KO combined with gain/loss of function establishing GLP-1/β-catenin pathway relationship, but ChIP not shown","pmids":["22292058"],"is_preprint":false},{"year":2014,"finding":"COUP-TFII directly binds the COX-2 promoter to inhibit its transcription; proinflammatory cytokines (IL-1β, TNF-α, TGF-β1) reduce COUP-TFII via miR-302a induction, which targets the 3'UTR of COUP-TFII mRNA, leading to de-repression of COX-2 in endometriosis.","method":"ChIP; promoter luciferase assay; miRNA inhibitor/mimic; siRNA in primary human endometrial stromal cells","journal":"The Journal of clinical endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 2 — ChIP demonstrates direct COX-2 promoter binding, combined with luciferase assays and miRNA functional studies","pmids":["24423359"],"is_preprint":false},{"year":2017,"finding":"NR2F2 transcriptionally activates miR-21 by binding to its promoter (shown by ChIP and luciferase assay); miR-21 suppresses Smad7 to promote TGF-β-dependent epithelial-mesenchymal transition in colorectal cancer.","method":"ChIP; luciferase reporter assay; siRNA knockdown; migration/invasion assays in CRC cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 — ChIP demonstrates direct binding to miR-21 promoter with functional validation, single lab study","pmids":["28192117"],"is_preprint":false},{"year":2013,"finding":"COUP-TFII directly targets the Snail1 promoter in colorectal cancer cells (shown by ChIP), regulating Snail1 expression and consequently suppressing adherence molecules ZO-1, E-cadherin, and β-catenin to promote metastasis.","method":"ChIP; reporter assays; siRNA knockdown; invasion/migration assays; tamoxifen-inducible KO mouse model","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2-3 — ChIP shows direct Snail1 promoter binding with in vivo validation in inducible KO model","pmids":["25032732"],"is_preprint":false},{"year":2013,"finding":"COUP-TFII inhibits NFκB-DNA binding and impairs coactivator-induced NFκB transactivation; endogenous COUP-TFII co-immunoprecipitates with NFκB subunits RelB and NFκB1 in MCF-7 breast cancer cells, and ectopic COUP-TFII expression in endocrine-resistant cells inhibits NFκB activation.","method":"Co-immunoprecipitation; NFκB reporter assay; EMSA; transient transfection","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP demonstrating physical interaction with NFκB subunits, combined with functional reporter assay","pmids":["24141032"],"is_preprint":false},{"year":2019,"finding":"A small-molecule COUP-TFII inhibitor identified by high-throughput screening directly binds the COUP-TFII ligand-binding domain and disrupts COUP-TFII interaction with transcription regulators including FOXA1, thereby repressing COUP-TFII transcriptional activity on target genes.","method":"High-throughput screening; LBD binding assays; Co-IP disruption; xenograft mouse models","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding to LBD demonstrated, physical interaction disruption shown, in vivo efficacy validated","pmids":["32494682"],"is_preprint":false},{"year":2019,"finding":"NR2F2 functions as a cofactor with pioneer factors FOXA1 and GATA3 at ERα binding sites in breast cancer; NR2F2 perturbation decreases ERα DNA binding and chromatin accessibility; most NR2F2 binding occurs independently of estrogen, and co-occupancy of all three TFs marks the most transcriptionally active ERα super-enhancer sites.","method":"ChIP-seq analysis (ENCODE); ATAC-seq; RNA-seq; perturbation of NR2F2 expression with measurement of ERα binding","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2-3 — genome-wide ChIP-seq with functional perturbation showing dependency of ERα binding on NR2F2","pmids":["31588232"],"is_preprint":false},{"year":2019,"finding":"KRAS/MEK signaling upregulates COUP-TFII, which in turn increases LDHA expression to drive lactate production; lactate then inhibits the TSC2-Rheb interaction, leading to mTORC1 activation and cellular growth independent of growth factor stimulation.","method":"COUP-TFII knockdown/overexpression; LDHA reporter assays; TSC2-Rheb co-immunoprecipitation; mTORC1 activity assays in KRAS-activated cells","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2-3 — mechanistic chain established via multiple functional assays, but single lab study","pmids":["30988000"],"is_preprint":false},{"year":2015,"finding":"COUP-TFII/Nrp2 expression determines the pathway and destination of preoptic area-derived GABAergic neurons; COUP-TFII-induced Nrp2 drives caudal migration toward amygdala, while suppression of COUP-TFII/Nrp2 redirects cells to the neocortex; overexpression retains cells in the medial amygdala.","method":"In utero electroporation gain/loss of function; conditional transgenic manipulation; cell migration tracking","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2-3 — gain/loss of function establishing COUP-TFII as a directional switch through Nrp2, but direct ChIP for Nrp2 not shown in this study","pmids":["26305926"],"is_preprint":false},{"year":2015,"finding":"Nr2f2 hinge region (five-amino acid deletion) is required for interaction with Fog2; Nr2f2 mutant rats with this deletion show lower blood pressure, and the mutant Nr2f2 protein shows greater interaction with Fog2 than wild-type, indicating that the Nr2f2-Fog2 interaction level critically influences blood pressure regulation.","method":"Zinc-finger nuclease gene editing; blood pressure measurement; protein-protein interaction assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — targeted gene editing with functional blood pressure phenotype and defined protein interaction change, but mechanism linking Fog2 interaction to BP not fully delineated","pmids":["25687237"],"is_preprint":false},{"year":2021,"finding":"COUP-TFII enhances glycolysis and suppresses fatty acid oxidation in myofibroblasts to promote kidney fibrosis; COUP-TFII directly binds the PGC1α promoter (shown by ChIP-qPCR) to reduce PGC1α levels; COUP-TFII overexpression induces αSMA and collagen 1 production, while KO decreases glycolysis and collagen levels.","method":"Conditional KO in mice; proteomic analysis; ChIP-qPCR; gain/loss of function in fibroblasts","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with unbiased proteomics, direct ChIP-qPCR evidence for PGC1α targeting, consistent in vitro and in vivo results","pmids":["34031962"],"is_preprint":false},{"year":2010,"finding":"NR2F2 is involved in villous cytotrophoblast differentiation to syncytiotrophoblast; NR2F2 directly activates TFAP2A (AP-2α) promoter activity in a dose-dependent manner, and this induction is potentiated by RARA and RXRA; siRNA silencing of NR2F2 blocks induction of TFAP2A and STB marker genes by 51-59%.","method":"NR2F2 overexpression and siRNA knockdown in primary CTB cells and JEG-3 cells; luciferase reporter assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2-3 — reporter assay and siRNA in primary human cells establishing direct transcriptional activation, single lab","pmids":["20195529"],"is_preprint":false},{"year":2020,"finding":"COUP-TFII overexpression in Parkinson's disease dopaminergic neurons disrupts mitochondrial function by repressing cytosolic aldehyde dehydrogenase gene expression, leading to DOPAL buildup; elevated COUP-TFII causes reduced mitochondrial cristae and accelerates neurodegeneration in MitoPark mice.","method":"DA neuron-specific transgenic overexpression and under-expression; MitoPark mouse model cross; mitochondrial morphology and gene expression analysis","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2-3 — neuron-specific gain/loss of function with defined mitochondrial phenotype and molecular target, single lab study","pmids":["32579581"],"is_preprint":false},{"year":2022,"finding":"Nr2f2 promotes ferroptosis and mitochondrial dysfunction in diabetes-induced heart failure by negatively regulating PGC-1α; Nr2f2 knockdown ameliorates ferroptosis and mitochondrial dysfunction via PGC-1α, while PGC-1α knockdown counteracts Nr2f2 knockdown protection.","method":"AAV9 cardiac overexpression; streptozotocin/high-fat diet diabetic model; siRNA knockdown; epistasis with PGC-1α knockdown","journal":"Mediators of inflammation","confidence":"Medium","confidence_rationale":"Tier 2-3 — in vivo overexpression and epistasis analysis establishing PGC-1α as effector, single lab","pmids":["36081650"],"is_preprint":false},{"year":2017,"finding":"Coup-TF1 and Coup-TF2 (Nr2f1 and Nr2f2) in MGE progenitors promote time-dependent specification of layer V SST+ cortical interneurons and autonomously repress PV+ fate, in part by directly driving Sox6 expression.","method":"MGE-specific conditional KO of Coup-TF1 and Coup-TF2; interneuron subtype marker analysis; Sox6 expression assays","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2-3 — conditional double KO with interneuron subtype phenotyping and identification of Sox6 as a downstream target, but direct ChIP not reported","pmids":["28694260"],"is_preprint":false},{"year":2013,"finding":"COUP-TFII regulates human endometrial stromal gene expression including inflammatory cytokines; ChIP-seq identified a genome-wide set of direct COUP-TFII target genes in endometrial stroma involved in cell adhesion, angiogenesis, and inflammation.","method":"siRNA knockdown in primary human endometrial stromal cells; microarray combined with ChIP-seq","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq genome-wide target identification with siRNA functional validation, but in primary human cells only","pmids":["24176914"],"is_preprint":false},{"year":2001,"finding":"COUP-TFII binds a nuclear hormone-responsive element (DR-type) at -841/-800 of the mouse Na+/H+ exchanger (NHE1) promoter and transactivates NHE1 expression; mutation at -829/-824 prevents COUP binding and abolishes activation; COUP-TFII expression in NIH 3T3 cells increases NHE synthesis.","method":"Reporter assays; DNase footprint analysis; EMSA; transactivation in NIH 3T3 and CV1 cells","journal":"European journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 1-2 — in vitro binding (EMSA, footprint) combined with mutagenesis and functional reporter assays","pmids":["11168401"],"is_preprint":false},{"year":2001,"finding":"COUP-TFII (but not COUP-TFI) is expressed in Ad12-transformed tumorigenic cells and completely represses MHC class I transcription by binding to the class I enhancer; NF-κB p50/p52 double-knockout cells demonstrated COUP-TFII can repress both non-activated and NF-κB-activated class I transcription.","method":"EMSA; reporter assays; NF-κB knockout cell lines; COUP-TFII promoter activity measurement","journal":"Virology","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct demonstration of COUP-TFII repression using KO cell lines as genetic controls, combined with binding assays","pmids":["11352663"],"is_preprint":false},{"year":2018,"finding":"COUP-TFII directly binds and suppresses the ANG (angiogenin) promoter in endometrial stromal cells; hypoxia-mediated suppression of COUP-TFII increases ANG expression and ANG-mediated angiogenic activity; ChIP and promoter assays confirmed direct regulation.","method":"ChIP; luciferase reporter assay; COUP-TFII knockdown/overexpression; tube formation assay in primary human cells","journal":"Human reproduction","confidence":"Medium","confidence_rationale":"Tier 2-3 — ChIP and reporter assay demonstrate direct binding, functional angiogenic readout confirmed, primary human cells","pmids":["29982401"],"is_preprint":false},{"year":2021,"finding":"Fbxo21 (an E3 ubiquitin ligase F-box protein) targets NR2F2 for ubiquitination and proteasomal degradation; Fbxo21 expression inversely correlates with NR2F2 protein level, and Fbxo21-mediated reduction of NR2F2 inhibits EMT in gastric cancer cells.","method":"Co-immunoprecipitation; ubiquitination assays; proteasome inhibitor treatment; rescue by NR2F2 re-expression","journal":"Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP and ubiquitination assay demonstrating E3 ligase-substrate relationship with rescue experiments","pmids":["33531987"],"is_preprint":false},{"year":2023,"finding":"An alternative NR2F2 isoform (NR2F2-Iso2), transcribed from an alternative TSS and lacking the DNA-binding domain, is epigenetically silenced by DNA methylation in normal melanocytes but becomes hypomethylated and re-expressed during metastatic melanoma progression; NR2F2-Iso2 modulates full-length NR2F2 activity over EMT- and NCC-associated target genes to drive metastatic progression.","method":"DNA methylation profiling; functional gain/loss of function; gene expression analysis of EMT/NCC targets; isoform-specific reporter assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2-3 — epigenetic regulation of alternative isoform combined with functional studies, but mechanism of isoform 2 modulation of isoform 1 not fully biochemically reconstituted","pmids":["37015919"],"is_preprint":false}],"current_model":"NR2F2 (COUP-TFII) is an orphan nuclear receptor that adopts an autorepressed conformation (crystal structure resolved) which can be released by retinoic acid to recruit coactivators; it functions primarily as a context-dependent transcriptional regulator that (1) represses Notch signaling to establish and maintain venous and lymphatic endothelial identity—acting through homodimers on HEY1/2 promoters in veins and as PROX1 heterodimers in lymphatic ECs—with its protein stability maintained by Tie2/Akt-mediated protection from proteasomal degradation; (2) directly regulates organogenesis (heart atrial identity via Tbx5/Hey2/Irx4, kidney via Eya1/Wt1, diaphragm, stomach, Leydig cell differentiation via StAR, uterine implantation via ERα suppression, and placentation); (3) controls neuronal migration direction in the CGE via neuropilin induction; (4) represses mitochondrial biogenesis and metabolic genes (PGC-1α network) in the heart and other tissues; and (5) interacts physically with partners including Prox1, GR (via SMRT/NCoR recruitment), HNF4, NFκB subunits, and FOXA1 to modulate gene regulatory networks across diverse developmental and pathological contexts, with its activity also regulated post-translationally by Fbxo21-mediated ubiquitination and by miRNAs including miR-302 targeting its 3'UTR."},"narrative":{"teleology":[{"year":1995,"claim":"Establishing NR2F2 as a transcriptional repressor that competes with RAR:RXR heterodimers on retinoic acid response elements, first demonstrating its capacity to actively silence gene expression (Oct-3/4) through high-affinity DNA binding and a C-terminal silencing domain.","evidence":"Reporter assays, EMSA, and deletion mutagenesis in cell lines","pmids":["7823919"],"confidence":"High","gaps":["No in vivo validation of Oct-3/4 repression","Identity of endogenous ligands unknown at this stage"]},{"year":1999,"claim":"Demonstrating that NR2F2 is required for cardiovascular development in vivo, with knockout embryos failing to remodel the primitive vascular plexus and showing defective atrial/sinus venosus development, identifying Angiopoietin-1 as a downstream target.","evidence":"Targeted gene deletion in mice with in situ hybridization","pmids":["10215630"],"confidence":"High","gaps":["Could not distinguish cell-autonomous vs. non-autonomous roles","Mechanism of Ang-1 regulation not defined"]},{"year":2005,"claim":"Resolving the vascular identity question: NR2F2 is selectively expressed in venous endothelium and represses Notch signaling to prevent arterial fate acquisition, establishing the first molecular determinant of venous versus arterial specification.","evidence":"Endothelial-specific conditional knockout and transgenic overexpression in mice with arterial/venous marker analysis","pmids":["15875024"],"confidence":"High","gaps":["Precise Notch target genes directly bound by NR2F2 not identified","Post-translational regulation of NR2F2 in ECs unknown"]},{"year":2005,"claim":"Extending NR2F2's developmental roles beyond vasculature: mesenchyme-specific ablation revealed essential functions in diaphragm formation (Bochdalek-type hernia upon loss) and stomach patterning downstream of Hedgehog signaling.","evidence":"Tissue-specific conditional knockouts with morphological and epistasis analysis","pmids":["16251273","15829524"],"confidence":"High","gaps":["Direct transcriptional targets in diaphragm mesenchyme not identified","Mechanism linking Hedgehog to NR2F2 expression not fully defined"]},{"year":2008,"claim":"Structural resolution of the autorepression mechanism: the crystal structure revealed that helix α10 bends into the ligand pocket and AF-2 occludes the coactivator groove, and that retinoic acids release this conformation to enable transcriptional activation — answering how an 'orphan' receptor is regulated.","evidence":"X-ray crystallography at 1.48 Å; site-directed mutagenesis; cell-based transcription assays","pmids":["18798693"],"confidence":"High","gaps":["Whether retinoic acid is the physiological ligand in vivo remains uncertain","Structural basis for ligand selectivity not fully explored"]},{"year":2008,"claim":"Defining NR2F2 as a partner of PROX1 in lymphatic endothelial cell fate specification: the two proteins form a stable complex that controls LEC-specific genes including VEGFR-3, FGFR-3, and neuropilin-1, extending NR2F2's vascular role to lymphatic identity.","evidence":"Reciprocal co-immunoprecipitation and functional gene expression analysis in LECs; conditional knockout at different developmental stages with ChIP","pmids":["18815287","20364082"],"confidence":"High","gaps":["Genome-wide binding profile of the NR2F2-PROX1 complex not determined","How PROX1 switches NR2F2 from homodimer repressor to LEC activator mechanistically unclear"]},{"year":2008,"claim":"Establishing NR2F2 as a neuronal migration determinant: NR2F2 is necessary and sufficient for caudal migration of CGE-derived cortical interneurons, and essential for Leydig cell differentiation independently of testosterone.","evidence":"Transplantation assays with RNAi in brain; tamoxifen-inducible conditional KO with testosterone rescue in testis","pmids":["19074032","18818749"],"confidence":"High","gaps":["Direct transcriptional targets mediating migration not identified at this point","Mechanism of Leydig progenitor arrest not molecularly defined"]},{"year":2012,"claim":"Identifying the direct genomic targets underpinning NR2F2's venous identity function — E2F1 (cell cycle), Foxc1, NP-1, Hey2, EphrinB2/EphB4 — and establishing that NR2F2 directly regulates kidney mesenchyme specification through Eya1 and Wt1.","evidence":"ChIP, microarray, and siRNA knockdown in HUVECs; conditional KO with ChIP in metanephric mesenchyme","pmids":["22734039","22669823"],"confidence":"High","gaps":["Genome-wide ChIP-seq in venous ECs not yet performed","How NR2F2 coordinates cell cycle and identity programs simultaneously unclear"]},{"year":2013,"claim":"Defining the molecular switch between venous and lymphatic fate: NR2F2 homodimers directly bind HEY1/HEY2 promoters to repress arterial genes in veins, while NR2F2-PROX1 heterodimers lack this capacity and instead activate LEC genes — resolving how one factor specifies two distinct endothelial identities.","evidence":"ChIP assays on HEY promoters; Co-IP for heterodimer formation; gain/loss-of-function","pmids":["23345397"],"confidence":"High","gaps":["Whether additional cofactors determine the homodimer/heterodimer equilibrium unknown","No structural model of the heterodimer"]},{"year":2013,"claim":"Establishing NR2F2 as a determinant of atrial chamber identity: cardiomyocyte-specific ablation ventricularizes atria with ventricle-type action potentials, and ChIP identifies Tbx5, Hey2, Irx4, and myosin light chains as direct targets.","evidence":"Cardiomyocyte-specific conditional KO; ChIP at E13.5; electrophysiology; genome-wide expression","pmids":["23725765"],"confidence":"High","gaps":["Whether NR2F2 maintains atrial identity in adults or only during development unclear","Interaction with other atrial transcription factors not biochemically defined"]},{"year":2013,"claim":"Providing the molecular basis for NR2F2-directed neuronal migration: NR2F2 directly binds Nrp1 and Nrp2 promoters in the developing telencephalon (by ChIP), and loss impairs Pax6+ cell migration into the amygdala.","evidence":"Conditional KO with in vivo ChIP and molecular marker analysis in brain","pmids":["22492355"],"confidence":"High","gaps":["Signaling ligands (semaphorins/VEGF-C) acting through neuropilins in this context not defined","Whether NR2F2 regulates additional guidance molecules unknown"]},{"year":2015,"claim":"Revealing NR2F2 as a metabolic repressor: cardiac overexpression suppresses mitochondrial electron transport chain genes, PGC-1α network, and oxygen consumption, causing dilated cardiomyopathy — linking NR2F2 to energy metabolism beyond its developmental roles.","evidence":"Cardiac-specific transgenic overexpression; mitochondrial functional assays; genetic rescue by calcineurin haploinsufficiency","pmids":["26356605"],"confidence":"High","gaps":["Whether NR2F2 directly binds PGC-1α regulatory regions in heart not shown in this study","Physiological contexts in which NR2F2 normally regulates cardiac metabolism unclear"]},{"year":2016,"claim":"Resolving how NR2F2 protein stability is maintained: Tie2/Akt signaling phosphorylates NR2F2 to protect it from proteasomal degradation in venous endothelium, connecting receptor tyrosine kinase signaling to venous identity maintenance.","evidence":"Conditional Tek KO; Ang-1 stimulation; PI3K/Akt inhibitors; proteasome inhibitor rescue in cultured ECs","pmids":["28005008"],"confidence":"High","gaps":["Specific phosphorylation site(s) on NR2F2 not mapped","Whether other RTK pathways also regulate NR2F2 stability unknown"]},{"year":2017,"claim":"Demonstrating an androgen-independent developmental role: NR2F2 in Wolffian duct mesenchyme actively promotes female reproductive tract regression via suppression of phospho-ERK signaling, overturning the dogma that Wolffian duct regression is purely passive.","evidence":"Conditional KO in Wolffian duct mesenchyme; androgen receptor manipulation; phospho-ERK analysis","pmids":["28818950"],"confidence":"High","gaps":["Direct transcriptional targets in Wolffian duct mesenchyme not identified","Mechanism linking NR2F2 to ERK suppression not defined"]},{"year":2019,"claim":"Establishing NR2F2 as a cofactor at ERα super-enhancers in breast cancer, cooperating with pioneer factors FOXA1 and GATA3; a small-molecule inhibitor was identified that binds the NR2F2 LBD and disrupts NR2F2-FOXA1 interaction, validating NR2F2 as a druggable target.","evidence":"ChIP-seq/ATAC-seq/RNA-seq for genomic binding; high-throughput screening with LBD binding assays and Co-IP disruption; xenograft models","pmids":["31588232","32494682"],"confidence":"High","gaps":["Selectivity and in vivo pharmacokinetics of the inhibitor not fully characterized","Whether inhibitor affects NR2F2 developmental functions unclear"]},{"year":2021,"claim":"Confirming direct PGC-1α promoter binding by NR2F2 via ChIP-qPCR in kidney fibroblasts, showing that NR2F2 promotes glycolysis over fatty acid oxidation to drive fibrosis — unifying the metabolic repression theme across tissues.","evidence":"Conditional KO in mice; ChIP-qPCR; proteomics; gain/loss of function in fibroblasts","pmids":["34031962"],"confidence":"High","gaps":["Genome-wide metabolic target set in fibroblasts not fully defined","Whether NR2F2-PGC-1α axis operates in all fibrotic contexts unknown"]},{"year":2023,"claim":"Discovery that an alternative NR2F2 isoform (NR2F2-Iso2) lacking the DNA-binding domain is epigenetically silenced in normal melanocytes but reactivated by hypomethylation in metastatic melanoma, where it modulates full-length NR2F2 activity on EMT targets.","evidence":"DNA methylation profiling; isoform-specific gain/loss of function; EMT/NCC target gene analysis","pmids":["37015919"],"confidence":"Medium","gaps":["Biochemical mechanism by which Iso2 modulates full-length NR2F2 not reconstituted","Structural basis for Iso2 function without DBD unknown","Generalizability beyond melanoma not tested"]},{"year":null,"claim":"The physiological ligand(s) activating NR2F2 in vivo, the specific phosphorylation sites governing its proteasomal stability, the structural basis of the PROX1 heterodimer switch, and the full scope of tissue-specific cofactor dependencies remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["Endogenous ligand identity in physiological contexts not established","No crystal structure of NR2F2-PROX1 or NR2F2-FOXA1 complexes","Phosphorylation sites mediating Akt-dependent stabilization not mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[8,5,6,7,31,46]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,2,5,6,7,8,9,14,19,23,31,40]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,5,6,8,36]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,1,4,6,10,11,12,16,17,18,20,24,25]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5,7,9,22,37]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[13,19,37,40,43]}],"complexes":["NR2F2-PROX1 heterodimer","NR2F2 homodimer"],"partners":["PROX1","FOXA1","NR3C1","HNF4A","RELA","FOG2","FBXO21","GATA3"],"other_free_text":[]},"mechanistic_narrative":"NR2F2 (COUP-TFII) is an orphan nuclear receptor that functions as a context-dependent transcriptional regulator essential for vascular identity, organogenesis, neuronal migration, and metabolic homeostasis. Its ligand-binding domain adopts an autorepressed conformation in which helix α10 occludes the ligand pocket and AF-2 folds into the cofactor site; retinoic acids release this autoinhibition to enable coactivator recruitment [PMID:18798693]. In venous endothelium, NR2F2 homodimers directly bind HEY1/HEY2 promoters to repress Notch signaling and maintain venous identity, whereas heterodimerization with PROX1 redirects its activity toward lymphatic endothelial gene programs including VEGFR-3 and neuropilins [PMID:15875024, PMID:23345397, PMID:18815287]. Beyond vascular specification, NR2F2 directly regulates atrial chamber identity through Tbx5/Hey2/Irx4, kidney mesenchyme specification through Eya1/Wt1, steroidogenesis through StAR, diaphragm and stomach patterning, neuronal migratory direction via neuropilin induction, and metabolic gene networks including PGC-1α repression in heart and kidney [PMID:23725765, PMID:22669823, PMID:24899578, PMID:16251273, PMID:22492355, PMID:26356605, PMID:34031962]."},"prefetch_data":{"uniprot":{"accession":"P24468","full_name":"COUP transcription factor 2","aliases":["Apolipoprotein A-I regulatory protein 1","ARP-1","COUP transcription factor II","COUP-TF II","Nuclear receptor subfamily 2 group F member 2"],"length_aa":414,"mass_kda":45.6,"function":"Ligand-activated transcription factor. Activated by high concentrations of 9-cis-retinoic acid and all-trans-retinoic acid, but not by dexamethasone, cortisol or progesterone (in vitro). Regulation of the apolipoprotein A-I gene transcription. Binds to DNA site A. May be required to establish ovary identity during early gonad development (PubMed:29478779)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P24468/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NR2F2","classification":"Not Classified","n_dependent_lines":17,"n_total_lines":1208,"dependency_fraction":0.014072847682119206},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PARP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NR2F2","total_profiled":1310},"omim":[{"mim_id":"621058","title":"NK1 HOMEOBOX 2; NKX1-2","url":"https://www.omim.org/entry/621058"},{"mim_id":"618901","title":"46,XX SEX REVERSAL 5; SRXX5","url":"https://www.omim.org/entry/618901"},{"mim_id":"617962","title":"ZINC FINGER PROTEIN 827; ZNF827","url":"https://www.omim.org/entry/617962"},{"mim_id":"616297","title":"MULTIPLE C2 DOMAINS-CONTAINING TRANSMEMBRANE PROTEIN 2; MCTP2","url":"https://www.omim.org/entry/616297"},{"mim_id":"615779","title":"CONGENITAL HEART DEFECTS, MULTIPLE TYPES, 4; CHTD4","url":"https://www.omim.org/entry/615779"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NR2F2"},"hgnc":{"alias_symbol":["COUP-TFII","COUPTFB","SVP40","NF-E3","COUPTF2"],"prev_symbol":["ARP1","TFCOUP2"]},"alphafold":{"accession":"P24468","domains":[{"cath_id":"3.30.50.10","chopping":"87-147","consensus_level":"high","plddt":95.2893,"start":87,"end":147},{"cath_id":"1.10.565.10","chopping":"172-190_208-401","consensus_level":"high","plddt":89.5022,"start":172,"end":401}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P24468","model_url":"https://alphafold.ebi.ac.uk/files/AF-P24468-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P24468-F1-predicted_aligned_error_v6.png","plddt_mean":76.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NR2F2","jax_strain_url":"https://www.jax.org/strain/search?query=NR2F2"},"sequence":{"accession":"P24468","fasta_url":"https://rest.uniprot.org/uniprotkb/P24468.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P24468/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P24468"}},"corpus_meta":[{"pmid":"15875024","id":"PMC_15875024","title":"Suppression 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arterial/venous marker analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO and gain-of-function with defined molecular phenotype, replicated across multiple approaches in a high-impact study\",\n      \"pmids\": [\"15875024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"COUP-TFII is required for angiogenesis and heart (atria/sinus venosus) development; COUP-TFII mutants fail to remodel the primitive capillary plexus and show downregulation of Angiopoietin-1, suggesting COUP-TFII is required for mesenchymal-endothelial signaling.\",\n      \"method\": \"Targeted gene deletion in mice; in situ hybridization and morphological analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — complete KO with defined cardiovascular phenotype and identified downstream target (Ang-1), foundational study with 437 citations\",\n      \"pmids\": [\"10215630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structure of the human COUP-TFII ligand-binding domain (1.48 Å) reveals an autorepressed conformation where helix α10 is bent into the ligand-binding pocket and the AF-2 helix is folded into the cofactor binding site. Retinoic acids promote COUP-TFII to recruit coactivators and activate transcription, releasing it from autorepression. Mutations disrupting cofactor binding, dimerization, or ligand binding substantially reduce transcriptional activity.\",\n      \"method\": \"X-ray crystallography; cell-based transcription assays; site-directed mutagenesis\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with mutagenesis and functional assays in multiple cell lines\",\n      \"pmids\": [\"18798693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"COUP-TFII physically interacts with Prox1 to form a stable complex in lymphatic endothelial cells (LECs), and this complex functions as a coregulator to control LEC lineage-specific genes including VEGFR-3, FGFR-3, and neuropilin-1, thereby specifying LEC fate.\",\n      \"method\": \"Co-immunoprecipitation; functional gene expression analysis in LECs\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP demonstrating physical interaction, combined with functional gene regulation data\",\n      \"pmids\": [\"18815287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"COUP-TFII directly stimulates expression of neuropilin-2 (a VEGF-C coreceptor) to enhance pro-lymphangiogenic VEGF-C actions; conditional ablation at early embryonic stage blocks pre-lymphatic EC formation, while late ablation causes loss of LEC identity and gain of blood EC fate.\",\n      \"method\": \"Conditional knockout mouse models; siRNA knockdown in primary human LECs; ChIP assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple conditional KO models at different developmental stages, ChIP demonstrating direct target regulation, and human cell validation\",\n      \"pmids\": [\"20364082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"COUP-TFII homodimers inhibit arterial differentiation in venous ECs by directly binding to promoter regions of Notch target genes HEY1 and HEY2, whereas COUP-TFII/PROX1 heterodimers lack this inhibitory effect and instead induce LEC-specific gene expression, defining a molecular switch between venous and lymphatic EC identity.\",\n      \"method\": \"ChIP assays; promoter binding analysis; gain- and loss-of-function experiments; Co-IP\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP demonstrates direct promoter binding, Co-IP confirms heterodimerization, functional consequence defined\",\n      \"pmids\": [\"23345397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Cardiomyocyte-specific COUP-TFII ablation produces ventricularized atria with ventricle-like action potentials, increased cardiomyocyte size, and T tubules; ChIP in E13.5 atria identified Tbx5, Hey2, Irx4, MLC2v, MLC2a, and MLC1a as direct COUP-TFII targets, establishing COUP-TFII as a determinant of atrial identity.\",\n      \"method\": \"Cardiomyocyte-specific conditional KO; chromatin immunoprecipitation; electrophysiology; genome-wide expression analysis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conditional KO with functional electrophysiological readout combined with ChIP identification of direct targets\",\n      \"pmids\": [\"23725765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"COUP-TFII directly regulates E2F1 transcription by tethering to Sp1 binding sites in the E2F1 promoter (shown by ChIP), thereby modulating cell cycle and proliferation; it also directly targets Foxc1, NP-1 (upstream Notch genes) and Hey2 (downstream Notch effector), and suppresses EphrinB2 while enhancing EphB4 expression to regulate venous identity.\",\n      \"method\": \"Microarray; chromatin immunoprecipitation; siRNA knockdown in HUVECs\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP demonstrates direct binding with functional validation of cell cycle and Notch pathway targets\",\n      \"pmids\": [\"22734039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"COUP-TFII (ARP-1) represses Oct-3/4 promoter activity through the RAREoct element in a dose-dependent manner, with the C-terminal domain harboring the silencing region. COUP-TFII binds RAREoct with higher affinity than RAR:RXR heterodimers and can compete with and displace RAR:RXR to actively silence the Oct-3/4 promoter.\",\n      \"method\": \"Reporter assays; EMSA; deletion mutagenesis; competition binding assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding assays with mutagenesis plus reporter assays, mechanistic competition demonstrated\",\n      \"pmids\": [\"7823919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"COUP-TFII directly represses Notch signaling to suppress NP-1 in veins; in the undifferentiated hESC state, OCT4 and OCT4-induced miR-302 directly repress NR2F2 transcriptionally and post-transcriptionally respectively; conversely NR2F2 directly inhibits OCT4 during differentiation, creating a positive feedback loop for its own expression.\",\n      \"method\": \"Luciferase reporter assays; ChIP; miRNA overexpression and knockdown; siRNA in hESCs\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ChIP, reporter assays, loss/gain of function) establishing bidirectional regulatory circuit\",\n      \"pmids\": [\"21151097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"COUP-TFII directly regulates neuropilin-1 and neuropilin-2 gene expression in the developing amygdala; ChIP assays confirmed Nrp1 and Nrp2 as direct COUP-TFII targets in the telencephalon in vivo; loss of COUP-TFII in CGE-derived cells impairs migration of Pax6+ cells into the basomedial amygdala nucleus.\",\n      \"method\": \"Conditional KO (Rx-Cre); ChIP; molecular marker analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo ChIP plus conditional KO with defined migratory phenotype\",\n      \"pmids\": [\"22492355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"COUP-TFII is required and sufficient for CGE-derived cortical interneuron caudal migration; knockdown inhibits caudal migration while ectopic expression in MGE cells redirects their migration caudally when transplanted into the CGE environment.\",\n      \"method\": \"Transcriptome comparison; transplantation assays; RNAi knockdown in mouse brain\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain- and loss-of-function transplantation experiments establishing both necessity and sufficiency\",\n      \"pmids\": [\"19074032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"COUP-TFII is essential for Leydig cell differentiation; conditional pre-pubertal ablation arrests Leydig cells at the progenitor stage, causing testosterone deficiency and infertility; testosterone administration rescues spermatogenetic defects, but Leydig cell maturation requires COUP-TFII itself, as testosterone cannot substitute for it.\",\n      \"method\": \"Tamoxifen-inducible Cre conditional KO; testosterone rescue experiments; histology\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — inducible conditional KO with hormone rescue experiment, clearly separating COUP-TFII's role in differentiation from maintenance\",\n      \"pmids\": [\"18818749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"COUP-TFII synergistically activates transcription of the CYP7A1 (cholesterol 7α-hydroxylase) promoter together with HNF4; COUP-TFII binds adjacent DR0 element and interacts with HNF4 through protein-protein interactions facilitated by juxtaposed binding elements.\",\n      \"method\": \"Transient transfection reporter assays; EMSA with in vitro-translated COUP-TFII; cotransfection in HepG2 cells\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro binding (EMSA) combined with reporter assays and mutagenesis demonstrating protein-protein interaction mechanism\",\n      \"pmids\": [\"10627496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"COUP-TFII suppression of ERα activity is required for successful embryo implantation and uterine decidualization; administration of ERα antagonist ICI 182,780 rescues implantation defects in uterine COUP-TFII knockout mice and restores Wnt4 and BMP2 expression.\",\n      \"method\": \"Uterine conditional KO (PR-Cre); ERα antagonist rescue experiment; gene expression analysis\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with pharmacological rescue establishing epistatic relationship between COUP-TFII and ERα\",\n      \"pmids\": [\"20219888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"COUP-TFII directly regulates Angiopoietin-1 transcription in pericytes to enhance tumor neoangiogenesis; conditional adult ablation of COUP-TFII severely compromises neoangiogenesis and suppresses tumor growth; provision of Angiopoietin-1 partially restores angiogenic defects in COUP-TFII-deficient mice.\",\n      \"method\": \"Conditional adult KO; xenograft and spontaneous tumor models; Ang-1 rescue experiment; ChIP\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional adult KO with defined molecular target and rescue experiment confirming pathway\",\n      \"pmids\": [\"20133706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"COUP-TFII is expressed in foregut mesenchyme and its ablation in the posthepatic mesenchymal plate causes Bochdalek-type congenital diaphragmatic hernia through failure of diaphragm formation and attachment to body wall.\",\n      \"method\": \"Tissue-specific conditional KO (foregut mesenchyme Cre); morphological and histological analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific conditional KO establishing required role in diaphragm formation\",\n      \"pmids\": [\"16251273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"COUP-TFII in gastric mesenchyme is required for radial and anteroposterior stomach patterning; COUP-TFII acts downstream of hedgehog signaling in the stomach mesenchyme, as cyclopamine treatment downregulates COUP-TFII expression.\",\n      \"method\": \"Conditional KO (Nkx3-2-Cre); organ culture with cyclopamine; X-gal staining of lacZ knockin\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with organ culture demonstrating Hh pathway epistasis\",\n      \"pmids\": [\"15829524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Uterine stromal/smooth muscle COUP-TFII is required for proper placentation; deletion increases trophoblast giant cell differentiation, reduces spongiotrophoblast layer, and causes absence of labyrinth formation with impaired placental vascularization.\",\n      \"method\": \"Conditional KO (uterine stromal Cre/loxP); histological analysis of placentation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined cellular and morphological phenotype in placenta\",\n      \"pmids\": [\"17404209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"COUP-TFII represses genes critical for mitochondrial electron transport chain enzyme activity, oxidative stress detoxification, mitochondrial dynamics, and the PGC-1 network, resulting in increased ROS, decreased oxygen consumption, and reduced glucose/oleate oxidation, leading to dilated cardiomyopathy.\",\n      \"method\": \"Cardiac-specific transgenic overexpression; mitochondrial function assays; gene expression profiling; calcineurin transgenic cross for haploinsufficiency rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function transgenics with mitochondrial functional readouts and genetic rescue by haploinsufficiency\",\n      \"pmids\": [\"26356605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"COUP-TFII in the Wolffian duct mesenchyme actively promotes elimination of male reproductive tracts in female embryos; COUP-TFII loss causes retention of Wolffian ducts independent of androgen; instead, enhanced phospho-ERK signaling in Wolffian duct epithelium mediates the retention via mesenchyme-epithelium cross-talk.\",\n      \"method\": \"Conditional KO in Wolffian duct mesenchyme; androgen receptor manipulation; phospho-ERK analysis\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with epistasis analysis distinguishing androgen-dependent vs. independent mechanisms\",\n      \"pmids\": [\"28818950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BRG1 chromatin-remodeling enzyme directly promotes COUP-TFII expression in venous endothelial cells by binding conserved regulatory elements in the COUP-TFII promoter and remodeling chromatin accessibility; BRG1 endothelial deletion downregulates COUP-TFII and causes aberrant arterial marker expression on veins.\",\n      \"method\": \"Endothelial-specific conditional KO of Brg1; ChIP for BRG1 at COUP-TFII promoter; chromatin accessibility analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO combined with ChIP demonstrating direct chromatin-level regulation of COUP-TFII\",\n      \"pmids\": [\"23406903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Tie2 signaling maintains COUP-TFII protein stability via Akt-mediated phosphorylation; Tie2 knockdown or PI3K/Akt pathway blockade reduces COUP-TFII protein levels, while proteasome inhibition restores COUP-TFII, indicating that Tie2/Akt signaling prevents proteasomal degradation of COUP-TFII to maintain venous identity.\",\n      \"method\": \"Conditional Tek KO in mice; Ang-1 stimulation; Tie2 knockdown; proteasome inhibitor rescue in cultured ECs\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic and pharmacological approaches with defined proteasomal degradation mechanism\",\n      \"pmids\": [\"28005008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NR2F2 directly activates Star (steroidogenic acute regulatory protein) gene expression in Leydig cells by binding to a DR1-like element between -131 and -95 bp of the Star promoter; NR2F2 knockdown reduces STAR mRNA/protein and basal steroid production; DR1 mutations that prevent NR2F2 binding blunt promoter activation.\",\n      \"method\": \"siRNA knockdown; promoter deletion constructs; ChIP; site-directed mutagenesis in Leydig cell lines\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP plus promoter deletion analysis plus mutagenesis of binding site in relevant cell type\",\n      \"pmids\": [\"24899578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"COUP-TFII is required for metanephric mesenchyme specification and kidney precursor cell survival; conditional ablation at E7.5 results in loss of Eya1, Six2, Pax2, and Gdnf expression; COUP-TFII directly regulates both Eya1 and Wt1 expression in metanephric mesenchyme as shown by ChIP.\",\n      \"method\": \"Conditional KO; ChIP; gene expression analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with ChIP-identified direct targets in vivo\",\n      \"pmids\": [\"22669823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"COUP-TFII regulates postnatal cerebellar growth and maturation by directly regulating IGF-1 expression in a Sp1-dependent manner (shown by ChIP); COUP-TFII knockout in brain reduces GCP proliferation, increases apoptosis, and decreases Akt1, GSK-3β, and mTOR activities downstream of IGF-1.\",\n      \"method\": \"NSE-Cre conditional KO; ChIP; IGF-1 pathway analysis; proliferation and apoptosis assays\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with ChIP showing direct IGF-1 regulation and downstream signaling pathway analysis\",\n      \"pmids\": [\"19041640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"COUP-TFII overexpression in satellite cells causes Duchenne-like dystrophy with regenerative failure due to deficient satellite cell proliferation and myoblast fusion; COUP-TFII transcriptionally represses promyogenic fusion factors including Npnt, Itgb1D, and Cav3, and reduces activation of focal adhesion kinase (FAK).\",\n      \"method\": \"Satellite cell-specific transgenic overexpression; dystrophin-deficient mouse cross; gene expression and FAK activation analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function in vivo model with defined molecular targets and signaling pathway readout\",\n      \"pmids\": [\"27617862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"miR-101 and miR-27a negatively regulate COUP-TFII; COUP-TFII in turn drives a FOXM1-CENPF transcriptional cascade to promote prostate cancer metastasis; COUP-TFII loss decreases FOXM1 and CENPF expression and invasion, while this axis also contributes to enzalutamide resistance.\",\n      \"method\": \"miRNA overexpression/knockdown; shRNA; clinical dataset correlation; invasion assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional validation of regulatory axis but primarily in cell lines without full mechanistic reconstitution\",\n      \"pmids\": [\"27108958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Glucocorticoid receptor (GR) physically interacts with COUP-TFII; GR stimulates COUP-TFII-induced transactivation via its AF-1 domain attracting coactivators, while COUP-TFII represses GR-governed transcription by tethering SMRT and NCoR corepressors via its C-terminal domain.\",\n      \"method\": \"Co-immunoprecipitation; transactivation reporter assays; domain deletion analysis\",\n      \"journal\": \"Annals of the New York Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP demonstrating physical interaction with defined domain requirements and bidirectional functional consequence\",\n      \"pmids\": [\"15265774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"COUP-TFII represses myoblast fusion during skeletal muscle development by transcriptionally repressing Npnt, Itgb1D, and Cav3; elevated COUP-TFII in myogenic precursors results in inefficient muscle development and reduced FAK activation.\",\n      \"method\": \"Transgenic myogenic precursor-specific overexpression; in vitro differentiation assays; gene expression analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — gain-of-function in vivo and in vitro with defined target genes but no direct ChIP confirmation of binding\",\n      \"pmids\": [\"28600496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"COUP-TFII controls pancreatic β-cell mass by inducing β-catenin gene expression and its targets (cyclin D1, axin 2); GLP-1-induced activation of β-catenin pathway is impaired in COUP-TFII-deficient islets; COUP-TFII expression is positively regulated by TCF7L2 in a feedback loop.\",\n      \"method\": \"Pdx1-Cre conditional KO; islet isolation and culture; gain/loss of function in β-cells; gene expression analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — conditional KO combined with gain/loss of function establishing GLP-1/β-catenin pathway relationship, but ChIP not shown\",\n      \"pmids\": [\"22292058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"COUP-TFII directly binds the COX-2 promoter to inhibit its transcription; proinflammatory cytokines (IL-1β, TNF-α, TGF-β1) reduce COUP-TFII via miR-302a induction, which targets the 3'UTR of COUP-TFII mRNA, leading to de-repression of COX-2 in endometriosis.\",\n      \"method\": \"ChIP; promoter luciferase assay; miRNA inhibitor/mimic; siRNA in primary human endometrial stromal cells\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrates direct COX-2 promoter binding, combined with luciferase assays and miRNA functional studies\",\n      \"pmids\": [\"24423359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NR2F2 transcriptionally activates miR-21 by binding to its promoter (shown by ChIP and luciferase assay); miR-21 suppresses Smad7 to promote TGF-β-dependent epithelial-mesenchymal transition in colorectal cancer.\",\n      \"method\": \"ChIP; luciferase reporter assay; siRNA knockdown; migration/invasion assays in CRC cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — ChIP demonstrates direct binding to miR-21 promoter with functional validation, single lab study\",\n      \"pmids\": [\"28192117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"COUP-TFII directly targets the Snail1 promoter in colorectal cancer cells (shown by ChIP), regulating Snail1 expression and consequently suppressing adherence molecules ZO-1, E-cadherin, and β-catenin to promote metastasis.\",\n      \"method\": \"ChIP; reporter assays; siRNA knockdown; invasion/migration assays; tamoxifen-inducible KO mouse model\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — ChIP shows direct Snail1 promoter binding with in vivo validation in inducible KO model\",\n      \"pmids\": [\"25032732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"COUP-TFII inhibits NFκB-DNA binding and impairs coactivator-induced NFκB transactivation; endogenous COUP-TFII co-immunoprecipitates with NFκB subunits RelB and NFκB1 in MCF-7 breast cancer cells, and ectopic COUP-TFII expression in endocrine-resistant cells inhibits NFκB activation.\",\n      \"method\": \"Co-immunoprecipitation; NFκB reporter assay; EMSA; transient transfection\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP demonstrating physical interaction with NFκB subunits, combined with functional reporter assay\",\n      \"pmids\": [\"24141032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A small-molecule COUP-TFII inhibitor identified by high-throughput screening directly binds the COUP-TFII ligand-binding domain and disrupts COUP-TFII interaction with transcription regulators including FOXA1, thereby repressing COUP-TFII transcriptional activity on target genes.\",\n      \"method\": \"High-throughput screening; LBD binding assays; Co-IP disruption; xenograft mouse models\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding to LBD demonstrated, physical interaction disruption shown, in vivo efficacy validated\",\n      \"pmids\": [\"32494682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NR2F2 functions as a cofactor with pioneer factors FOXA1 and GATA3 at ERα binding sites in breast cancer; NR2F2 perturbation decreases ERα DNA binding and chromatin accessibility; most NR2F2 binding occurs independently of estrogen, and co-occupancy of all three TFs marks the most transcriptionally active ERα super-enhancer sites.\",\n      \"method\": \"ChIP-seq analysis (ENCODE); ATAC-seq; RNA-seq; perturbation of NR2F2 expression with measurement of ERα binding\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — genome-wide ChIP-seq with functional perturbation showing dependency of ERα binding on NR2F2\",\n      \"pmids\": [\"31588232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KRAS/MEK signaling upregulates COUP-TFII, which in turn increases LDHA expression to drive lactate production; lactate then inhibits the TSC2-Rheb interaction, leading to mTORC1 activation and cellular growth independent of growth factor stimulation.\",\n      \"method\": \"COUP-TFII knockdown/overexpression; LDHA reporter assays; TSC2-Rheb co-immunoprecipitation; mTORC1 activity assays in KRAS-activated cells\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — mechanistic chain established via multiple functional assays, but single lab study\",\n      \"pmids\": [\"30988000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"COUP-TFII/Nrp2 expression determines the pathway and destination of preoptic area-derived GABAergic neurons; COUP-TFII-induced Nrp2 drives caudal migration toward amygdala, while suppression of COUP-TFII/Nrp2 redirects cells to the neocortex; overexpression retains cells in the medial amygdala.\",\n      \"method\": \"In utero electroporation gain/loss of function; conditional transgenic manipulation; cell migration tracking\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — gain/loss of function establishing COUP-TFII as a directional switch through Nrp2, but direct ChIP for Nrp2 not shown in this study\",\n      \"pmids\": [\"26305926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nr2f2 hinge region (five-amino acid deletion) is required for interaction with Fog2; Nr2f2 mutant rats with this deletion show lower blood pressure, and the mutant Nr2f2 protein shows greater interaction with Fog2 than wild-type, indicating that the Nr2f2-Fog2 interaction level critically influences blood pressure regulation.\",\n      \"method\": \"Zinc-finger nuclease gene editing; blood pressure measurement; protein-protein interaction assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — targeted gene editing with functional blood pressure phenotype and defined protein interaction change, but mechanism linking Fog2 interaction to BP not fully delineated\",\n      \"pmids\": [\"25687237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"COUP-TFII enhances glycolysis and suppresses fatty acid oxidation in myofibroblasts to promote kidney fibrosis; COUP-TFII directly binds the PGC1α promoter (shown by ChIP-qPCR) to reduce PGC1α levels; COUP-TFII overexpression induces αSMA and collagen 1 production, while KO decreases glycolysis and collagen levels.\",\n      \"method\": \"Conditional KO in mice; proteomic analysis; ChIP-qPCR; gain/loss of function in fibroblasts\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with unbiased proteomics, direct ChIP-qPCR evidence for PGC1α targeting, consistent in vitro and in vivo results\",\n      \"pmids\": [\"34031962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NR2F2 is involved in villous cytotrophoblast differentiation to syncytiotrophoblast; NR2F2 directly activates TFAP2A (AP-2α) promoter activity in a dose-dependent manner, and this induction is potentiated by RARA and RXRA; siRNA silencing of NR2F2 blocks induction of TFAP2A and STB marker genes by 51-59%.\",\n      \"method\": \"NR2F2 overexpression and siRNA knockdown in primary CTB cells and JEG-3 cells; luciferase reporter assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — reporter assay and siRNA in primary human cells establishing direct transcriptional activation, single lab\",\n      \"pmids\": [\"20195529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"COUP-TFII overexpression in Parkinson's disease dopaminergic neurons disrupts mitochondrial function by repressing cytosolic aldehyde dehydrogenase gene expression, leading to DOPAL buildup; elevated COUP-TFII causes reduced mitochondrial cristae and accelerates neurodegeneration in MitoPark mice.\",\n      \"method\": \"DA neuron-specific transgenic overexpression and under-expression; MitoPark mouse model cross; mitochondrial morphology and gene expression analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — neuron-specific gain/loss of function with defined mitochondrial phenotype and molecular target, single lab study\",\n      \"pmids\": [\"32579581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Nr2f2 promotes ferroptosis and mitochondrial dysfunction in diabetes-induced heart failure by negatively regulating PGC-1α; Nr2f2 knockdown ameliorates ferroptosis and mitochondrial dysfunction via PGC-1α, while PGC-1α knockdown counteracts Nr2f2 knockdown protection.\",\n      \"method\": \"AAV9 cardiac overexpression; streptozotocin/high-fat diet diabetic model; siRNA knockdown; epistasis with PGC-1α knockdown\",\n      \"journal\": \"Mediators of inflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vivo overexpression and epistasis analysis establishing PGC-1α as effector, single lab\",\n      \"pmids\": [\"36081650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Coup-TF1 and Coup-TF2 (Nr2f1 and Nr2f2) in MGE progenitors promote time-dependent specification of layer V SST+ cortical interneurons and autonomously repress PV+ fate, in part by directly driving Sox6 expression.\",\n      \"method\": \"MGE-specific conditional KO of Coup-TF1 and Coup-TF2; interneuron subtype marker analysis; Sox6 expression assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — conditional double KO with interneuron subtype phenotyping and identification of Sox6 as a downstream target, but direct ChIP not reported\",\n      \"pmids\": [\"28694260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"COUP-TFII regulates human endometrial stromal gene expression including inflammatory cytokines; ChIP-seq identified a genome-wide set of direct COUP-TFII target genes in endometrial stroma involved in cell adhesion, angiogenesis, and inflammation.\",\n      \"method\": \"siRNA knockdown in primary human endometrial stromal cells; microarray combined with ChIP-seq\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq genome-wide target identification with siRNA functional validation, but in primary human cells only\",\n      \"pmids\": [\"24176914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"COUP-TFII binds a nuclear hormone-responsive element (DR-type) at -841/-800 of the mouse Na+/H+ exchanger (NHE1) promoter and transactivates NHE1 expression; mutation at -829/-824 prevents COUP binding and abolishes activation; COUP-TFII expression in NIH 3T3 cells increases NHE synthesis.\",\n      \"method\": \"Reporter assays; DNase footprint analysis; EMSA; transactivation in NIH 3T3 and CV1 cells\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro binding (EMSA, footprint) combined with mutagenesis and functional reporter assays\",\n      \"pmids\": [\"11168401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"COUP-TFII (but not COUP-TFI) is expressed in Ad12-transformed tumorigenic cells and completely represses MHC class I transcription by binding to the class I enhancer; NF-κB p50/p52 double-knockout cells demonstrated COUP-TFII can repress both non-activated and NF-κB-activated class I transcription.\",\n      \"method\": \"EMSA; reporter assays; NF-κB knockout cell lines; COUP-TFII promoter activity measurement\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct demonstration of COUP-TFII repression using KO cell lines as genetic controls, combined with binding assays\",\n      \"pmids\": [\"11352663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"COUP-TFII directly binds and suppresses the ANG (angiogenin) promoter in endometrial stromal cells; hypoxia-mediated suppression of COUP-TFII increases ANG expression and ANG-mediated angiogenic activity; ChIP and promoter assays confirmed direct regulation.\",\n      \"method\": \"ChIP; luciferase reporter assay; COUP-TFII knockdown/overexpression; tube formation assay in primary human cells\",\n      \"journal\": \"Human reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — ChIP and reporter assay demonstrate direct binding, functional angiogenic readout confirmed, primary human cells\",\n      \"pmids\": [\"29982401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Fbxo21 (an E3 ubiquitin ligase F-box protein) targets NR2F2 for ubiquitination and proteasomal degradation; Fbxo21 expression inversely correlates with NR2F2 protein level, and Fbxo21-mediated reduction of NR2F2 inhibits EMT in gastric cancer cells.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assays; proteasome inhibitor treatment; rescue by NR2F2 re-expression\",\n      \"journal\": \"Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP and ubiquitination assay demonstrating E3 ligase-substrate relationship with rescue experiments\",\n      \"pmids\": [\"33531987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"An alternative NR2F2 isoform (NR2F2-Iso2), transcribed from an alternative TSS and lacking the DNA-binding domain, is epigenetically silenced by DNA methylation in normal melanocytes but becomes hypomethylated and re-expressed during metastatic melanoma progression; NR2F2-Iso2 modulates full-length NR2F2 activity over EMT- and NCC-associated target genes to drive metastatic progression.\",\n      \"method\": \"DNA methylation profiling; functional gain/loss of function; gene expression analysis of EMT/NCC targets; isoform-specific reporter assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — epigenetic regulation of alternative isoform combined with functional studies, but mechanism of isoform 2 modulation of isoform 1 not fully biochemically reconstituted\",\n      \"pmids\": [\"37015919\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NR2F2 (COUP-TFII) is an orphan nuclear receptor that adopts an autorepressed conformation (crystal structure resolved) which can be released by retinoic acid to recruit coactivators; it functions primarily as a context-dependent transcriptional regulator that (1) represses Notch signaling to establish and maintain venous and lymphatic endothelial identity—acting through homodimers on HEY1/2 promoters in veins and as PROX1 heterodimers in lymphatic ECs—with its protein stability maintained by Tie2/Akt-mediated protection from proteasomal degradation; (2) directly regulates organogenesis (heart atrial identity via Tbx5/Hey2/Irx4, kidney via Eya1/Wt1, diaphragm, stomach, Leydig cell differentiation via StAR, uterine implantation via ERα suppression, and placentation); (3) controls neuronal migration direction in the CGE via neuropilin induction; (4) represses mitochondrial biogenesis and metabolic genes (PGC-1α network) in the heart and other tissues; and (5) interacts physically with partners including Prox1, GR (via SMRT/NCoR recruitment), HNF4, NFκB subunits, and FOXA1 to modulate gene regulatory networks across diverse developmental and pathological contexts, with its activity also regulated post-translationally by Fbxo21-mediated ubiquitination and by miRNAs including miR-302 targeting its 3'UTR.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NR2F2 (COUP-TFII) is an orphan nuclear receptor that functions as a context-dependent transcriptional regulator essential for vascular identity, organogenesis, neuronal migration, and metabolic homeostasis. Its ligand-binding domain adopts an autorepressed conformation in which helix α10 occludes the ligand pocket and AF-2 folds into the cofactor site; retinoic acids release this autoinhibition to enable coactivator recruitment [PMID:18798693]. In venous endothelium, NR2F2 homodimers directly bind HEY1/HEY2 promoters to repress Notch signaling and maintain venous identity, whereas heterodimerization with PROX1 redirects its activity toward lymphatic endothelial gene programs including VEGFR-3 and neuropilins [PMID:15875024, PMID:23345397, PMID:18815287]. Beyond vascular specification, NR2F2 directly regulates atrial chamber identity through Tbx5/Hey2/Irx4, kidney mesenchyme specification through Eya1/Wt1, steroidogenesis through StAR, diaphragm and stomach patterning, neuronal migratory direction via neuropilin induction, and metabolic gene networks including PGC-1α repression in heart and kidney [PMID:23725765, PMID:22669823, PMID:24899578, PMID:16251273, PMID:22492355, PMID:26356605, PMID:34031962].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Establishing NR2F2 as a transcriptional repressor that competes with RAR:RXR heterodimers on retinoic acid response elements, first demonstrating its capacity to actively silence gene expression (Oct-3/4) through high-affinity DNA binding and a C-terminal silencing domain.\",\n      \"evidence\": \"Reporter assays, EMSA, and deletion mutagenesis in cell lines\",\n      \"pmids\": [\"7823919\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo validation of Oct-3/4 repression\", \"Identity of endogenous ligands unknown at this stage\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrating that NR2F2 is required for cardiovascular development in vivo, with knockout embryos failing to remodel the primitive vascular plexus and showing defective atrial/sinus venosus development, identifying Angiopoietin-1 as a downstream target.\",\n      \"evidence\": \"Targeted gene deletion in mice with in situ hybridization\",\n      \"pmids\": [\"10215630\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Could not distinguish cell-autonomous vs. non-autonomous roles\", \"Mechanism of Ang-1 regulation not defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolving the vascular identity question: NR2F2 is selectively expressed in venous endothelium and represses Notch signaling to prevent arterial fate acquisition, establishing the first molecular determinant of venous versus arterial specification.\",\n      \"evidence\": \"Endothelial-specific conditional knockout and transgenic overexpression in mice with arterial/venous marker analysis\",\n      \"pmids\": [\"15875024\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise Notch target genes directly bound by NR2F2 not identified\", \"Post-translational regulation of NR2F2 in ECs unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extending NR2F2's developmental roles beyond vasculature: mesenchyme-specific ablation revealed essential functions in diaphragm formation (Bochdalek-type hernia upon loss) and stomach patterning downstream of Hedgehog signaling.\",\n      \"evidence\": \"Tissue-specific conditional knockouts with morphological and epistasis analysis\",\n      \"pmids\": [\"16251273\", \"15829524\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets in diaphragm mesenchyme not identified\", \"Mechanism linking Hedgehog to NR2F2 expression not fully defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Structural resolution of the autorepression mechanism: the crystal structure revealed that helix α10 bends into the ligand pocket and AF-2 occludes the coactivator groove, and that retinoic acids release this conformation to enable transcriptional activation — answering how an 'orphan' receptor is regulated.\",\n      \"evidence\": \"X-ray crystallography at 1.48 Å; site-directed mutagenesis; cell-based transcription assays\",\n      \"pmids\": [\"18798693\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether retinoic acid is the physiological ligand in vivo remains uncertain\", \"Structural basis for ligand selectivity not fully explored\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defining NR2F2 as a partner of PROX1 in lymphatic endothelial cell fate specification: the two proteins form a stable complex that controls LEC-specific genes including VEGFR-3, FGFR-3, and neuropilin-1, extending NR2F2's vascular role to lymphatic identity.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation and functional gene expression analysis in LECs; conditional knockout at different developmental stages with ChIP\",\n      \"pmids\": [\"18815287\", \"20364082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide binding profile of the NR2F2-PROX1 complex not determined\", \"How PROX1 switches NR2F2 from homodimer repressor to LEC activator mechanistically unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Establishing NR2F2 as a neuronal migration determinant: NR2F2 is necessary and sufficient for caudal migration of CGE-derived cortical interneurons, and essential for Leydig cell differentiation independently of testosterone.\",\n      \"evidence\": \"Transplantation assays with RNAi in brain; tamoxifen-inducible conditional KO with testosterone rescue in testis\",\n      \"pmids\": [\"19074032\", \"18818749\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets mediating migration not identified at this point\", \"Mechanism of Leydig progenitor arrest not molecularly defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identifying the direct genomic targets underpinning NR2F2's venous identity function — E2F1 (cell cycle), Foxc1, NP-1, Hey2, EphrinB2/EphB4 — and establishing that NR2F2 directly regulates kidney mesenchyme specification through Eya1 and Wt1.\",\n      \"evidence\": \"ChIP, microarray, and siRNA knockdown in HUVECs; conditional KO with ChIP in metanephric mesenchyme\",\n      \"pmids\": [\"22734039\", \"22669823\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide ChIP-seq in venous ECs not yet performed\", \"How NR2F2 coordinates cell cycle and identity programs simultaneously unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defining the molecular switch between venous and lymphatic fate: NR2F2 homodimers directly bind HEY1/HEY2 promoters to repress arterial genes in veins, while NR2F2-PROX1 heterodimers lack this capacity and instead activate LEC genes — resolving how one factor specifies two distinct endothelial identities.\",\n      \"evidence\": \"ChIP assays on HEY promoters; Co-IP for heterodimer formation; gain/loss-of-function\",\n      \"pmids\": [\"23345397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional cofactors determine the homodimer/heterodimer equilibrium unknown\", \"No structural model of the heterodimer\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing NR2F2 as a determinant of atrial chamber identity: cardiomyocyte-specific ablation ventricularizes atria with ventricle-type action potentials, and ChIP identifies Tbx5, Hey2, Irx4, and myosin light chains as direct targets.\",\n      \"evidence\": \"Cardiomyocyte-specific conditional KO; ChIP at E13.5; electrophysiology; genome-wide expression\",\n      \"pmids\": [\"23725765\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NR2F2 maintains atrial identity in adults or only during development unclear\", \"Interaction with other atrial transcription factors not biochemically defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Providing the molecular basis for NR2F2-directed neuronal migration: NR2F2 directly binds Nrp1 and Nrp2 promoters in the developing telencephalon (by ChIP), and loss impairs Pax6+ cell migration into the amygdala.\",\n      \"evidence\": \"Conditional KO with in vivo ChIP and molecular marker analysis in brain\",\n      \"pmids\": [\"22492355\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling ligands (semaphorins/VEGF-C) acting through neuropilins in this context not defined\", \"Whether NR2F2 regulates additional guidance molecules unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealing NR2F2 as a metabolic repressor: cardiac overexpression suppresses mitochondrial electron transport chain genes, PGC-1α network, and oxygen consumption, causing dilated cardiomyopathy — linking NR2F2 to energy metabolism beyond its developmental roles.\",\n      \"evidence\": \"Cardiac-specific transgenic overexpression; mitochondrial functional assays; genetic rescue by calcineurin haploinsufficiency\",\n      \"pmids\": [\"26356605\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NR2F2 directly binds PGC-1α regulatory regions in heart not shown in this study\", \"Physiological contexts in which NR2F2 normally regulates cardiac metabolism unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolving how NR2F2 protein stability is maintained: Tie2/Akt signaling phosphorylates NR2F2 to protect it from proteasomal degradation in venous endothelium, connecting receptor tyrosine kinase signaling to venous identity maintenance.\",\n      \"evidence\": \"Conditional Tek KO; Ang-1 stimulation; PI3K/Akt inhibitors; proteasome inhibitor rescue in cultured ECs\",\n      \"pmids\": [\"28005008\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphorylation site(s) on NR2F2 not mapped\", \"Whether other RTK pathways also regulate NR2F2 stability unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating an androgen-independent developmental role: NR2F2 in Wolffian duct mesenchyme actively promotes female reproductive tract regression via suppression of phospho-ERK signaling, overturning the dogma that Wolffian duct regression is purely passive.\",\n      \"evidence\": \"Conditional KO in Wolffian duct mesenchyme; androgen receptor manipulation; phospho-ERK analysis\",\n      \"pmids\": [\"28818950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets in Wolffian duct mesenchyme not identified\", \"Mechanism linking NR2F2 to ERK suppression not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Establishing NR2F2 as a cofactor at ERα super-enhancers in breast cancer, cooperating with pioneer factors FOXA1 and GATA3; a small-molecule inhibitor was identified that binds the NR2F2 LBD and disrupts NR2F2-FOXA1 interaction, validating NR2F2 as a druggable target.\",\n      \"evidence\": \"ChIP-seq/ATAC-seq/RNA-seq for genomic binding; high-throughput screening with LBD binding assays and Co-IP disruption; xenograft models\",\n      \"pmids\": [\"31588232\", \"32494682\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity and in vivo pharmacokinetics of the inhibitor not fully characterized\", \"Whether inhibitor affects NR2F2 developmental functions unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Confirming direct PGC-1α promoter binding by NR2F2 via ChIP-qPCR in kidney fibroblasts, showing that NR2F2 promotes glycolysis over fatty acid oxidation to drive fibrosis — unifying the metabolic repression theme across tissues.\",\n      \"evidence\": \"Conditional KO in mice; ChIP-qPCR; proteomics; gain/loss of function in fibroblasts\",\n      \"pmids\": [\"34031962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide metabolic target set in fibroblasts not fully defined\", \"Whether NR2F2-PGC-1α axis operates in all fibrotic contexts unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Discovery that an alternative NR2F2 isoform (NR2F2-Iso2) lacking the DNA-binding domain is epigenetically silenced in normal melanocytes but reactivated by hypomethylation in metastatic melanoma, where it modulates full-length NR2F2 activity on EMT targets.\",\n      \"evidence\": \"DNA methylation profiling; isoform-specific gain/loss of function; EMT/NCC target gene analysis\",\n      \"pmids\": [\"37015919\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biochemical mechanism by which Iso2 modulates full-length NR2F2 not reconstituted\", \"Structural basis for Iso2 function without DBD unknown\", \"Generalizability beyond melanoma not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The physiological ligand(s) activating NR2F2 in vivo, the specific phosphorylation sites governing its proteasomal stability, the structural basis of the PROX1 heterodimer switch, and the full scope of tissue-specific cofactor dependencies remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Endogenous ligand identity in physiological contexts not established\", \"No crystal structure of NR2F2-PROX1 or NR2F2-FOXA1 complexes\", \"Phosphorylation sites mediating Akt-dependent stabilization not mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [8, 5, 6, 7, 31, 46]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 2, 5, 6, 7, 8, 9, 14, 19, 23, 31, 40]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 5, 6, 8, 36]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0074160\", \"supporting_discovery_ids\": [0, 5, 6, 7, 8, 9, 14, 19, 23, 31, 40]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1, 4, 6, 10, 11, 12, 16, 17, 18, 20, 24, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5, 7, 9, 22, 37]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [13, 19, 37, 40, 43]}\n    ],\n    \"complexes\": [\n      \"NR2F2-PROX1 heterodimer\",\n      \"NR2F2 homodimer\"\n    ],\n    \"partners\": [\n      \"PROX1\",\n      \"FOXA1\",\n      \"NR3C1\",\n      \"HNF4A\",\n      \"RELA\",\n      \"FOG2\",\n      \"FBXO21\",\n      \"GATA3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}