{"gene":"ETV4","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":1991,"finding":"PEA3 (ETV4) binds to a specific enhancer element (PEA3 binding site juxtaposed to an AP-1 site) in the human urokinase-type plasminogen activator (uPA) gene promoter and is required for enhancer activity, as demonstrated by footprinting, gel retardation, and transient transfection with deletion/point mutations.","method":"DNase I footprinting, gel retardation (EMSA), transient transfection with deletion and point-mutant reporter constructs","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro DNA-binding assays combined with mutagenesis and reporter gene assays; multiple orthogonal methods in single study","pmids":["1923525"],"is_preprint":false},{"year":1995,"finding":"E1AF (ETV4) transcriptionally activates three different subclasses of matrix metalloproteinase (MMP) gene promoters (stromelysin/MMP-3, type I collagenase/MMP-1, and 92 kDa type IV collagenase/MMP-9), increasing CAT reporter activity ~10–20-fold in transient expression assays.","method":"Transient co-transfection reporter (CAT) assays with MMP promoter constructs","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean functional reporter assay with three independent MMP promoters; single lab but multiple substrates tested","pmids":["7731700"],"is_preprint":false},{"year":1996,"finding":"Transfection of E1AF (ETV4) expression plasmid into non-invasive MCF-7 breast cancer cells confers invasive and motile activities accompanied by increased MMP-9 expression, establishing a direct functional link between E1AF and tumor cell invasion.","method":"Stable transfection of E1AF expression vector into MCF-7 cells, in vitro invasion assay, in vivo tumor implantation, Northern blot for MMP-9","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function in non-invasive cells with functional invasion readout and molecular mechanism (MMP-9 induction); replicated in vivo","pmids":["8570199"],"is_preprint":false},{"year":1996,"finding":"PEA3 (ETV4) transactivates the vimentin gene promoter through a PEA3 binding site, as shown by transient transfection assays in mammary epithelial and tumor cell lines.","method":"Transient transfection reporter assay with vimentin promoter constructs in multiple cell lines","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter assay with site-specific evidence; single lab, two cell line contexts","pmids":["8895512"],"is_preprint":false},{"year":1997,"finding":"E1AF (ETV4) activates the human p21(Waf1/Cip1) promoter by interacting with Ets-binding sites near p53-responsive elements, in a p53-independent manner, as demonstrated by deletion of EBS abolishing activity in p53-null cells.","method":"Transient transfection reporter assay with p21 promoter constructs (wild-type and EBS deletion mutants) in SiHa and Saos2 cells; Northern blot showing correlation of p21 and E1AF under cisplatin treatment","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis of EBS in reporter combined with expression correlation; single lab","pmids":["9223430"],"is_preprint":false},{"year":1997,"finding":"Antisense E1AF (ETV4) transfection in HSC3 oral squamous cell carcinoma cells reduces MMP-1, -3, and -9 expression and decreases invasive potential both in vitro and in vivo, establishing a required role of E1AF in MMP-driven invasion.","method":"Antisense expression vector transfection, mRNA/protein quantification, in vitro 3D raft invasion culture, in vivo nude mouse implantation","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with multiple orthogonal invasion readouts (in vitro and in vivo) plus molecular mechanism (MMP downregulation)","pmids":["9176403"],"is_preprint":false},{"year":1997,"finding":"PEA3 (ETV4) is a downstream target of the HER2/Neu receptor tyrosine kinase; HER2/Neu upregulates PEA3 transcriptional activity through two Ras-dependent MAPK pathways (ERK and SAPK/JNK), as demonstrated using dominant-negative signaling mutants.","method":"Co-transfection reporter assay with constitutively active HER2/Neu and dominant-negative Ras (Rap1a), ERK pathway mutants, and JNK pathway mutants; ERK/JNK kinase activation assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic pathway dissection with dominant-negative mutants targeting multiple nodes; single lab but multiple orthogonal methods","pmids":["9467955"],"is_preprint":false},{"year":1997,"finding":"HER2/Neu overexpression initiates a signaling cascade that increases PEA3 (ETV4) transcriptional activity; transcriptionally activated PEA3 stimulates both HER2/neu and PEA3 gene transcription by binding to sites in their promoters, forming an autoregulatory loop.","method":"Reporter assay, EMSA/DNA-binding to HER2 and PEA3 promoters, co-transfection experiments in breast cancer cells","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter and binding assays; single lab","pmids":["9380403"],"is_preprint":false},{"year":1999,"finding":"E1AF (ETV4) overexpression in fibrosarcoma cells induces MT1-MMP expression, activates secreted pro-MMP-2, and increases cell motility and invasion, contributing to metastatic capacity in vivo.","method":"Stable transfection of E1AF cDNA into QR-32 fibrosarcoma cells, MMP-2/MT1-MMP expression analysis, in vitro motility/invasion assays, in vivo pulmonary metastasis assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function with mechanistic readout (MT1-MMP induction and MMP-2 activation) plus in vivo validation; single lab","pmids":["10208438"],"is_preprint":false},{"year":2000,"finding":"PEA3 (ETV4) contains multiple functional domains: a strong N-terminal activation domain flanked by two inhibitory regions that independently suppress activity, and the ETS domain plus flanking regions that independently inhibit DNA binding in mammalian cells; antibody relief of autoinhibition was required to detect DNA binding in vitro.","method":"Deletion mutagenesis in COS cells with reporter assays (transactivation domain mapping); EMSA with PEA3 deletion mutants and PEA3-specific antibody","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic mutagenesis with both transcriptional activation and DNA-binding functional assays; multiple orthogonal methods in single study","pmids":["11096072"],"is_preprint":false},{"year":2000,"finding":"HGF upregulates E1AF (ETV4) expression, which in turn activates MMP-1, -3, and -9 promoters through Ets-binding sites, driving oral cancer cell invasion; antisense E1AF blocks HGF-induced MMP upregulation and invasion.","method":"HGF treatment of HSC3 cells, RT-PCR for E1AF/MMP mRNAs, CAT reporter assays with wild-type and Ets-site-mutant MMP-9 promoters, organotypic raft invasion culture","journal":"Carcinogenesis","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — promoter mutagenesis combined with antisense knockdown and functional invasion assay; multiple orthogonal methods","pmids":["10836994"],"is_preprint":false},{"year":2001,"finding":"PEA3 (ETV4) is upregulated in response to Wnt1 expression in mammary epithelial cells and potently activates COX-2 transcription; the NF-IL6 site in the COX-2 promoter is important for PEA3 responsiveness, as shown by promoter mapping.","method":"Transient transfection reporter assay with COX-2 promoter deletion constructs in Wnt1-expressing cells; Western blot for PEA3 in Wnt1 cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter deletion mapping with Wnt1 gain-of-function context; single lab","pmids":["11274170"],"is_preprint":false},{"year":2001,"finding":"Each member of the pea3 subfamily (pea3/ETV4, er81/ETV1, erm/ETV5) is coordinately overexpressed in MMTV-neu mammary tumors; expression of a dominant-negative pea3 transgene in MMTV-neu mice dramatically delayed mammary tumor onset and reduced tumor number/size, establishing a required role for PEA3 factors in HER2/Neu-mediated oncogenesis.","method":"Transgenic mouse model (MMTV-neu × MMTV-dominant-negative-pea3 bitransgenic), tumor latency/incidence monitoring, RT-PCR for transgene expression in tumors","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function in an in vivo mammalian cancer model with clear phenotypic readout","pmids":["11719215"],"is_preprint":false},{"year":2002,"finding":"In Pea3 (ETV4) mutant mice, specific motor neuron pools fail to arborize normally within target muscles and are mispositioned within the spinal cord, establishing that peripherally-induced ETS gene expression coordinates central positioning and terminal branching of spinal motor neurons.","method":"Pea3 knockout mouse analysis, histological examination of muscle innervation, spinal cord neuroanatomy","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function in vivo with defined structural neuronal phenotype; replicated across independent observations","pmids":["12372283"],"is_preprint":false},{"year":2004,"finding":"PEA3 (ETV4) cooperates with beta-catenin/Lef-1 and c-Jun to activate osteopontin (OPN) transcription; co-transfection of all four factors increased luciferase expression ~280-fold and induced endogenous OPN in a rat mammary cell line.","method":"Transient transfection reporter assay with OPN promoter-luciferase, co-transfection of beta-catenin, Lef-1, PEA3, and c-Jun in various combinations; endogenous OPN induction by RT-PCR","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — combinatorial co-transfection with endogenous gene readout; single lab","pmids":["14990565"],"is_preprint":false},{"year":2004,"finding":"E1AF (ETV4) binds to and activates the β1,4-galactosyltransferase I (GalT I) promoter through an Ets-binding site at -205 to -200; stable transfection of E1AF in low-metastatic cells increased GalT I expression and cell migration.","method":"Deletion and mutation analysis of GalT I promoter-luciferase reporter, EMSA with anti-E1AF antibody, stable transfection and migration assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — EMSA plus promoter mutagenesis plus functional gain-of-function; single lab","pmids":["15611127"],"is_preprint":false},{"year":2005,"finding":"E1AF (ETV4) activates the Rho/Rho-associated kinase (ROCK) pathway in NSCLC cells: E1AF-transfected cells have increased GTP-bound Rho and higher myosin light chain phosphorylation (a ROCK effector), and ROCK inhibitor Y27632 suppresses E1AF-induced motility, invasion, and tumorigenesis.","method":"Rho activation assay (GTP-bound Rho pull-down), MLC phosphorylation Western blot, ROCK inhibitor treatment, in vitro motility/invasion assays, in vivo nude mouse tumor/metastasis assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — pathway dissection with pharmacological inhibitor plus biochemical readouts of Rho/ROCK activity and in vivo validation; multiple orthogonal methods","pmids":["16322223"],"is_preprint":false},{"year":2007,"finding":"E1AF (ETV4) forms a protein complex with Sp1, contributes to Sp1 phosphorylation, and functions as a mediator between EGF signaling and Sp1 transcriptional activity; Sp1 brings E1AF to the GalT V promoter to activate its transcription and promote glioma invasion.","method":"Co-immunoprecipitation (E1AF-Sp1 complex), Sp1 phosphorylation Western blot, ChIP assay on GalT V promoter, reporter assay, invasion assay in glioma cells","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP plus functional invasion assay; single lab","pmids":["17938207"],"is_preprint":false},{"year":2007,"finding":"E1AF (ETV4) promotes breast cancer cell cycle progression by directly upregulating Cyclin D3 transcription; E1AF RNAi reduces Cyclin D3 expression and cell cycle progression, and forced Cyclin D3 expression rescues the E1AF knockdown phenotype.","method":"Luciferase reporter assay for Cyclin D3 promoter activity, siRNA knockdown, rescue by Cyclin D3 overexpression, flow cytometry cell cycle analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay, RNAi knockdown, and epistatic rescue experiment; single lab","pmids":["17467662"],"is_preprint":false},{"year":2009,"finding":"Etv4 and Etv5 are positively regulated by GDNF/Ret signaling in ureteric bud tips; mice lacking both Etv4 alleles and one Etv5 allele show renal agenesis/hypodysplasia, and double homozygous knockouts have complete renal failure; Etv4/Etv5 are required for expression of Cxcr4, Myb, Met, and Mmp14 in the ureteric bud.","method":"Mouse genetic knockouts (Etv4-/- , Etv5-/-, compound mutants), renal histology, gene expression analysis (Cxcr4, Myb, Met, Mmp14), Ret signaling context","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — compound genetic knockouts in vivo with defined downstream target gene identification and dose-dependent phenotypes","pmids":["19898483"],"is_preprint":false},{"year":2010,"finding":"PEA3/ETV4 controls proliferation and invasive properties of oesophageal adenocarcinoma cells; a key target gene is MMP-1; the ERK MAP kinase pathway activates PEA3 and drives the ERK-PEA3-MMP-1 signaling axis.","method":"siRNA knockdown of PEA3, proliferation and invasion assays, MMP-1 reporter assay, ERK pathway inhibition experiments, ChIP or reporter assays","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi loss-of-function with dual phenotypic readout and molecular target identification; single lab","pmids":["21143918"],"is_preprint":false},{"year":2011,"finding":"ETV4 (PEA3) acts as a broad coactivator of HIF signaling: ETV4 forms a complex with HIF-1/2α (demonstrated by mammalian two-hybrid and FRET), and the complex is recruited to the PHD2 promoter (confirmed by ChIP); 7.7% of hypoxically induced transcripts require ETV4 for efficient induction.","method":"Mammalian two-hybrid assay, FRET, HIF-1α domain mapping, CITED2 overexpression, factor inhibiting HIF depletion, ChIP for ETV4 and HIF-1α at PHD2 promoter, genome-wide expression profiling","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (two-hybrid, FRET, domain mapping, ChIP, genome-wide profiling) establishing complex formation and genomic co-occupancy in single study","pmids":["22075993"],"is_preprint":false},{"year":2011,"finding":"PEA3 (ETV4) directly activates Notch-1 transcription (AP-1-independent) and Notch-4 transcription (c-JUN-dependent) in breast cancer cells; ChIP confirmed PEA3 enrichment on both Notch-1 and Notch-4 promoters; PEA3 recruitment to Notch-4 requires c-JUN.","method":"siRNA knockdown of PEA3, RT-PCR and Western blot for Notch receptors, ChIP for PEA3 on Notch-1 and Notch-4 promoters, Notch-4 luciferase reporter assay, TAM-67 and c-Jun siRNA to dissect AP-1 dependency","journal":"Breast cancer research : BCR","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP confirmation of direct promoter binding combined with reporter assay and mechanistic dissection (c-JUN dependency) via multiple approaches","pmids":["21679465"],"is_preprint":false},{"year":2013,"finding":"Etv4 promotes prostate cancer metastasis downstream of co-activated PI3-kinase/Ras signaling; Etv4 knockdown abrogates the metastatic phenotype of cells derived from Pten-loss/Kras-activation mouse model without affecting primary tumor growth.","method":"Genetically engineered mouse model (Pten loss + oncogenic Kras), lineage tracing with fluorescent reporter, Etv4 shRNA knockdown in derived metastatic cell line, in vivo metastasis assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic model combined with lineage tracing and targeted knockdown with defined metastasis vs growth phenotype dissection","pmids":["23918374"],"is_preprint":false},{"year":2013,"finding":"Etv4 and Etv5 mediate NGF retrograde signaling and axonal growth of DRG sensory neurons; distal axon NGF application induces Etv4/Etv5 mRNA via MEK/ERK pathway; Etv4/Etv5 siRNA knockdown inhibits NGF-induced neurite outgrowth, while overexpression of Etv4 or Etv5 potentiates it.","method":"Compartmentalized DRG neuron cultures with distal NGF application, real-time PCR, pharmacological MEK/ERK inhibition, siRNA knockdown, overexpression gain-of-function, neurite outgrowth assay","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — both gain- and loss-of-function in primary neurons with pathway dissection (MEK/ERK) and retrograde signaling paradigm; multiple methods","pmids":["24089499"],"is_preprint":false},{"year":2015,"finding":"Crystal structures of the ETV4 ETS DNA-binding domain, alone and in complex with DNA, revealed that: (1) DNA backbone contacts account for most binding affinity; (2) a coordinated water network mediates base selection upstream of the GGAA core; (3) ETV4 crystallizes as a disulfide-linked dimer via a novel interface, and reduction to monomers increases DNA binding affinity 40–200-fold, revealing a redox-dependent regulatory mechanism.","method":"X-ray crystallography (crystal structures alone and in complex with DNA), disulfide bond reduction experiments, DNA-binding affinity measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures with functional validation of redox regulation; multiple orthogonal methods","pmids":["25866208"],"is_preprint":false},{"year":2015,"finding":"Etv4 and Etv5 are specifically expressed in undifferentiated ES cells downstream of Oct3/4; double knockout reduces ES cell proliferation (with upregulation of CDK inhibitors p16/p19, p15, p57) and impairs induction of ectoderm differentiation markers; Etv4/Etv5 regulate stem cell genes Tcf15 and Gbx2.","method":"ES cell double knockout by gene targeting, proliferation assay, flow cytometry, embryoid body differentiation assay, microarray gene expression analysis, rescue by Etv4/Etv5 re-expression","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — double knockout with rescue, proliferation and differentiation phenotype plus molecular target identification; single lab","pmids":["26224636"],"is_preprint":false},{"year":2015,"finding":"ACLY and ACC1 regulate ETV4 protein levels via α-ketoglutarate under hypoxia; loss of ACLY/ACC1 paradoxically increases α-ketoglutarate under hypoxia, which reduces ETV4 expression and activity likely via an epigenetic mechanism; ETV4 knockdown recapitulates the anti-apoptotic transcriptional program of ACLY/ACC1 depletion.","method":"Genome-wide shRNA screen, ETV4 siRNA knockdown, metabolomics (α-ketoglutarate measurement), α-ketoglutarate supplementation, transcriptional profiling, apoptosis assays","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — shRNA screen plus metabolomic rescue experiment; mechanism (epigenetic) inferred but not fully established; single lab","pmids":["26452058"],"is_preprint":false},{"year":2016,"finding":"Ret and Etv4 signaling promote directed cell movements (rather than proliferation) of ureteric bud tip progenitor cells during renal branching morphogenesis; Etv4-/- cells tend to lag behind wild-type sister cells and contribute only to trunks rather than tips.","method":"Mosaic Analysis with Double Markers (MADM) for single-cell lineage tracing in Etv4 mutant/wild-type chimeric kidneys, time-lapse organ culture imaging","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — sophisticated single-cell genetic mosaic analysis with live imaging clearly separating proliferation from directed movement","pmids":["26894589"],"is_preprint":false},{"year":2017,"finding":"ETV4 interacts with MED25 (Mediator subunit 25) through two independent regions: the N-terminal activation domain (AD) and the ETS DNA-binding domain (DBD); the DBD can simultaneously contact all three MED25 sites while the AD contacts one site, creating a high-affinity multivalent interaction; MED25 stimulates ETV4 DNA binding by relieving autoinhibition; ETV4 and MED25 co-occupy enhancers in prostate cancer cells and are jointly required for target gene transcription.","method":"NMR chemical shift perturbation, ITC/SPR binding kinetics, domain mapping, crystal structure context, ChIP-seq for ETV4 and MED25, siRNA knockdown + gene expression in prostate cancer cells","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR-based interaction mapping combined with genome-wide ChIP-seq and functional gene expression in cells; multiple orthogonal methods","pmids":["28728983"],"is_preprint":false},{"year":2017,"finding":"ETV4 (and ETV1/ETV5) DNA binding is autoinhibited by two independent inhibitory regions flanking the ETS domain: a C-terminal α-helix that packs against the ETS domain and perturbs the DNA-recognition helix (resolved by crystal structure), and an intrinsically disordered N-terminal inhibitory domain (NID) that makes transient intramolecular contacts with the DNA-recognition helix (resolved by NMR); acetylation of lysines in the NID activates DNA binding.","method":"Crystal structures of ETV1/4/5, NMR spectroscopy, deletion mutagenesis, acetylation functional assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures plus NMR plus mutagenesis plus PTM functional assay in a single mechanistic study","pmids":["28161714"],"is_preprint":false},{"year":2017,"finding":"ERK kinase phosphorylates ETV4 at Ser73, which blocks ETV4 binding to the E3 ubiquitin ligase COP1, thereby preventing ubiquitination and proteasomal degradation of ETV4 and stabilizing the protein.","method":"ERK activation/inhibition experiments, Western blot for ETV4 protein levels, site-directed mutagenesis (Ser73), co-immunoprecipitation of ETV4-COP1, ubiquitination assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphorylation site mutagenesis and Co-IP for ETV4-COP1 interaction; single lab, moderate mechanistic depth","pmids":["28373072"],"is_preprint":false},{"year":2017,"finding":"ETV4 directly regulates Cyclin D1 (CCND1) transcription to promote G1-to-S phase cell cycle progression in pancreatic cancer cells; forced Cyclin D1 expression rescues growth inhibition caused by ETV4 silencing.","method":"shRNA-mediated ETV4 silencing in ASPC1 and Colo357 cells, ectopic ETV4 expression in BXPC3 cells, reporter assay and ChIP for Cyclin D1 promoter, flow cytometry cell cycle analysis, rescue by Cyclin D1 re-expression","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay and rescue epistasis; single lab, two cell line contexts","pmids":["29117940"],"is_preprint":false},{"year":2018,"finding":"CIC (Capicua) transcriptionally represses ETV4; loss of CIC leads to ETV4 upregulation, which in turn induces MMP1 expression; MMP1 knockdown completely blocks CIC-deficiency-induced HCC cell proliferation and invasion, establishing the CIC-ETV4-MMP1 axis.","method":"CIC overexpression/knockdown in HCC cells, RT-PCR/Western blot for ETV4 and MMP1, MMP1 siRNA rescue, in vivo tumor growth assay","journal":"Hepatology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistatic knockdown rescue defines pathway order; single lab","pmids":["29251790"],"is_preprint":false},{"year":2018,"finding":"ETV4 directly regulates MMP13 transcription in mammary epithelial cells; MMP13 contributes to ETV4-induced proliferation, migration, invasion, and anchorage-independent growth; MMP13 inhibition blocks tumor formation induced by ETV4 in immunodeficient mice.","method":"MMP13 promoter-luciferase reporter assays with ETV4 constructs, MMP13 overexpression/knockdown rescue experiments, in vitro proliferation/migration/invasion assays, in vivo xenograft tumorigenicity assay","journal":"Breast cancer research : BCR","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct promoter regulation confirmed, rescue epistasis, and in vivo validation; multiple orthogonal methods","pmids":["29996935"],"is_preprint":false},{"year":2019,"finding":"PBK kinase enhances the binding of ETV4 to the uPAR promoter (shown by ChIP), increasing uPAR expression and HCC cell migration/invasion; ETV4 is the transcription factor directly binding the core uPAR promoter region.","method":"ChIP assay for ETV4 on uPAR promoter ± PBK, PBK gain/loss-of-function, uPAR overexpression rescue in PBK knockdown, orthotopic mouse model","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with functional epistasis rescue; single lab","pmids":["30914208"],"is_preprint":false},{"year":2019,"finding":"Phosphorylation of ETV4 at tyrosine 392 by tyrosine kinase PTK6 increases nuclear translocation of ETV4 and is essential for its function in promoting CXCL1/8 expression, tumor-associated neutrophil recruitment, lymphangiogenesis, and lymph node metastasis in bladder cancer.","method":"PTK6-ETV4 interaction and phosphorylation assay, Y392 site-directed mutagenesis, nuclear/cytoplasmic fractionation, CXCL1/8 reporter assay, in vivo lymph node metastasis models","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PTM site mutagenesis with nuclear translocation and functional consequences; single lab","pmids":["36670069"],"is_preprint":false},{"year":2019,"finding":"ETV4 transcriptionally upregulates ZEB1 (a strong EMT inducer) via the S100A8/A9-MCAM-ETV4 axis in breast cancer cells, driving epithelial-mesenchymal transition, tumor growth, and lung metastasis.","method":"siRNA knockdown of MCAM and ETV4, Western blot and RT-PCR for ZEB1 and EMT markers, luciferase reporter assay for ZEB1 promoter, in vivo xenograft and metastasis assays","journal":"Neoplasia (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay and functional in vivo validation; single lab","pmids":["31100639"],"is_preprint":false},{"year":2019,"finding":"ETV4 directly regulates PXN (paxillin) and MMP1 transcription in non-small cell lung cancer; ETV4-driven proliferation and migration are partially abolished by PXN and/or MMP1 inhibition.","method":"Microarray gain/loss-of-function, luciferase reporter assay for PXN and MMP1 promoters, siRNA knockdown of PXN and MMP1, proliferation and migration assays","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay plus epistatic inhibition; single lab","pmids":["31670855"],"is_preprint":false},{"year":2019,"finding":"ETV4 transcriptionally upregulates MSI2 by directly binding to its promoter (confirmed by ChIP and luciferase reporter), promoting lung adenocarcinoma proliferation and invasion; ectopic MSI2 rescues the effects of ETV4 knockdown.","method":"ChIP assay for ETV4 at MSI2 promoter, luciferase reporter assay, ETV4 shRNA knockdown, MSI2 re-expression rescue, CCK8/invasion assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter plus epistatic rescue; single lab","pmids":["31253395"],"is_preprint":false},{"year":2020,"finding":"ETV4 deletion (CRISPR/Cas9) in endometrial cancer cells greatly reduces estrogen receptor (ER) genomic binding at the majority of ER-bound loci, dampens the gene expression response to estradiol, reduces chromatin accessibility at some ER-bound loci, and impairs ER nuclear translocation; ETV4 loss decreases estrogen-dependent growth in 3D culture and in vivo.","method":"CRISPR/Cas9 homozygous ETV4 deletion, ChIP-seq for ER binding, RNA-seq after estradiol treatment, ATAC-seq for chromatin accessibility, nuclear translocation assay, 3D organoid culture, in vivo estrogen-dependent growth assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — clean genetic deletion with genome-wide ChIP-seq, ATAC-seq, and transcriptomics plus functional in vitro and in vivo validation; multiple orthogonal methods","pmids":["32046982"],"is_preprint":false},{"year":2020,"finding":"ETV4 directly binds the FOSL1 promoter to increase FOSL1 expression in clear cell renal cell carcinoma via an AKT-dependent manner; the ETV4/FOSL1 axis promotes ccRCC cell migration and metastasis.","method":"ChIP for ETV4 on FOSL1 promoter, reporter assay, AKT inhibition experiments, in vitro migration/invasion assays, in vivo metastasis assay","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter plus AKT pathway inhibition; single lab","pmids":["32305558"],"is_preprint":false},{"year":2020,"finding":"ETV4 directly binds the CDKN1A (p21) promoter at -704/-696 bp upstream of TSS (confirmed by ChIP and luciferase assay) to repress p21 expression; ETV4 also reduces p53 protein levels; in a transgenic mouse model of prostate-specific ETV4 expression, both p21 and p27 are decreased and prostatic intraepithelial neoplasia develops.","method":"Transgenic mouse model (prostate-specific ETV4), ChIP for ETV4 at CDKN1A promoter, luciferase reporter assay with CDKN1A promoter, Western blot for p21/p27/p53 in mouse prostate","journal":"Journal of hematology & oncology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo transgenic model plus ChIP plus reporter mutagenesis; multiple orthogonal methods across in vitro and in vivo","pmids":["32791988"],"is_preprint":false},{"year":2021,"finding":"ETV4 and ETV5 are expressed in synovial sarcoma downstream of FGFR signaling (driven by SS18-SSX fusion); ETV4/ETV5 knockdown inhibits synovial sarcoma growth primarily through cell cycle control, and causes striking upregulation of DUX4 and its transcriptional targets.","method":"FGFR genetic knockout models, FGFR inhibitor BGJ398 treatment, ETV4/ETV5 siRNA knockdown, transcriptome analysis, FGFR inhibitor + xenograft assays","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic FGFR knockout and pharmacological inhibition plus ETV4/ETV5 knockdown with transcriptome readout; single lab","pmids":["33983905"],"is_preprint":false},{"year":2021,"finding":"ETV4 promotes breast cancer stemness by transcriptionally activating glycolytic genes (HK2, LDHA) and CXCR4, thereby activating Sonic Hedgehog signaling; ETV4 knockdown reduces glucose uptake, lactate release, and BCSC maintenance.","method":"ETV4 knockdown/overexpression, glucose uptake and lactate assays, CXCR4 promoter reporter assay, sphere formation assay for stemness, xenograft assay","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay for CXCR4 plus metabolic and stemness functional assays; single lab","pmids":["34052833"],"is_preprint":false},{"year":2021,"finding":"ETV4 directly binds the CXCR5 promoter to increase CXCR5 expression in pancreatic ductal adenocarcinoma; CXCL13 increases ETV4 expression via ERK1/2 pathway; the CXCL13/ETV4/CXCR5 axis forms a positive feedback loop promoting PDAC invasion and metastasis.","method":"ChIP for ETV4 on CXCR5 promoter, CXCR5 promoter luciferase reporter, ERK1/2 pathway inhibition, CXCR5 knockdown epistasis, CXCR5-neutralizing antibody, in vivo metastasis assay","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter plus epistatic knockdown rescue; single lab","pmids":["34582976"],"is_preprint":false},{"year":2022,"finding":"ETV4 interacts directly with YAP; this interaction increases nuclear YAP accumulation and directly augments YAP/TEAD4-mediated transcriptional activation; the ETV4-YAP complex activates CXCL1 and CXCL5 to promote myeloid cell recruitment and tumor immune evasion in HCC.","method":"Co-immunoprecipitation (ETV4-YAP interaction), nuclear fractionation, luciferase reporter for YAP/TEAD4 targets, ChIP, in vivo transplanted tumor models with immune cell profiling","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus reporter assay plus in vivo immune phenotyping; single lab","pmids":["35296440"],"is_preprint":false},{"year":2022,"finding":"HBx (HBV X protein) increases chromatin accessibility at the ETV4 locus via H3K27ac super-enhancer formation, upregulating ETV4 expression; elevated ETV4 then promotes HCC cell invasion and metastasis by transcriptionally upregulating DVL2 and activating Wnt/β-catenin signaling.","method":"H3K27ac ChIP-seq (super-enhancer mapping), RNA-seq, DVL2 reporter/Western blot, Wnt/β-catenin pathway readouts, in vitro invasion assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq defining chromatin mechanism plus functional target validation; single lab","pmids":["35121725"],"is_preprint":false},{"year":2023,"finding":"ETV4 transcriptionally activates PD-L1 and CCL2 expression in HCC cells, increasing tumor-associated macrophage and MDSC infiltration and inhibiting CD8+ T-cell accumulation; FGF19/FGFR4 and HGF/c-MET upregulate ETV4 via ERK1/2 pathway; ETV4 also upregulates FGFR4, creating a FGF19-ETV4-FGFR4 positive feedback loop.","method":"ETV4 overexpression/knockdown in HCC cell lines, luciferase reporter assay for PD-L1 and CCL2 promoters, orthotopic mouse models, flow cytometry and immunofluorescence for immune cell profiling, ERK1/2 inhibition, CCR2 inhibitor treatment","journal":"Journal of hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay plus in vivo immune phenotyping plus feedback loop dissection; single lab but multiple cancer-relevant readouts","pmids":["36907560"],"is_preprint":false},{"year":2023,"finding":"ETV4 controls HK1 expression to regulate glycolysis-lactate production and thereby activates mTORC1 by relieving TSC2 repression of Rheb; when ETV4 is targeted and low-lactate stress ensues, HDAC6 deacetylates TSC2 (stabilizing it), and G3BP2 recruits lysosomal-TSC2 to suppress mTORC1; HDAC6-G3BP2 complex is required for this adaptive stress response.","method":"ETV4 knockdown in NSCLC cells, HK1 reporter assay, lactate/mTORC1 activity measurements, HDAC6-G3BP2 co-IP, TSC2 deacetylation and stability assays, lysosomal fractionation, perinuclear mTOR distribution imaging","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway dissection with biochemical assays (Co-IP, deacetylation, fractionation); single lab","pmids":["36823378"],"is_preprint":false},{"year":2023,"finding":"ETV4 transcriptionally activates TNF-α and MAPK11 expression; hepatocyte-specific ETV4 knockout reduces DEN-CCL4-induced HCC development and decreases hepatic TNF-α, MAPK11, and macrophage accumulation, while hepatocyte-specific ETV4 transgenic expression promotes HCC growth.","method":"Hepatocyte-specific ETV4 knockout (ETV4fl/fl, alb-cre) and transgenic (ETV4Hep-TG) mice, DEN-CCL4 HCC model, luciferase reporter for TNF-α and MAPK11 promoters, immunoblotting, histology","journal":"Cancer communications (London, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic models (KO and TG) with defined pathway targets and in vivo disease phenotype; multiple orthogonal methods","pmids":["37670477"],"is_preprint":false},{"year":2024,"finding":"ETV4 binds to IKZF1-bound enhancers in multiple myeloma cells and maintains MYC and other oncogene expression after IMiD-mediated IKZF1 depletion; CRISPR/Cas9 ablation of ETV4 sensitizes IMiD-resistant MM cells, establishing ETV4 as a mediator of transcriptional plasticity and IMiD resistance.","method":"ChIP-seq for ETV4 and IKZF1, CRISPR/Cas9 ETV4 deletion, gene expression analysis, cell viability assays in IMiD-resistant vs sensitive cells","journal":"Blood cancer discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq showing co-occupancy plus CRISPR genetic deletion with defined resistance phenotype; single lab","pmids":["37934799"],"is_preprint":false}],"current_model":"ETV4 (PEA3/E1AF) is an ETS-family transcription factor whose DNA-binding activity is autoinhibited by flanking N-terminal (intrinsically disordered, regulated by lysine acetylation) and C-terminal (α-helical) inhibitory domains, and further controlled by a redox switch (disulfide-linked dimerization reduces DNA-binding affinity 40–200-fold); it is activated downstream of receptor tyrosine kinase signaling (HER2/Neu, FGFR, Ret, HGF/c-Met) via Ras-dependent ERK and JNK/SAPK MAPK pathways, with ERK phosphorylation at Ser73 also stabilizing the protein by blocking COP1-mediated ubiquitination; activated ETV4 recruits the Mediator complex through multivalent interactions with MED25, co-occupies enhancers with AP1 factors, and transcriptionally drives a broad target gene program including multiple matrix metalloproteinases (MMP-1, -3, -7, -9, -13, MT1-MMP), invasion/metastasis effectors (uPA/uPAR, Rho/ROCK pathway), cell-cycle regulators (Cyclin D1, Cyclin D3; repression of p21 via direct CDKN1A promoter binding and p53 reduction), immune modulators (PD-L1, CCL2, CXCL1/8, TNF-α), developmental regulators (Cxcr4, Met, Mmp14 in the kidney; Notch-1/4 in breast cancer), and co-activating HIF-1/2α at hypoxia-inducible gene promoters; additionally, ETV4 interacts with YAP to potentiate Hippo pathway transcription and controls mTORC1 activity through HK1-driven glycolysis/lactate production, collectively establishing it as a multifunctional oncogenic transcription factor that integrates growth factor, metabolic, and epigenetic signals to drive invasion, metastasis, stemness, and immune evasion across diverse tissue contexts."},"narrative":{"mechanistic_narrative":"ETV4 (PEA3/E1AF) is an ETS-family transcription factor that integrates receptor tyrosine kinase signaling into a transcriptional program driving tumor cell invasion, metastasis, proliferation, and immune modulation across diverse tissues [PMID:1923525, PMID:8570199, PMID:23918374]. Its DNA-binding activity is intrinsically autoinhibited by two independent elements flanking the ETS domain: a C-terminal α-helix that perturbs the DNA-recognition helix and an intrinsically disordered N-terminal inhibitory domain whose lysine acetylation relieves repression; an additional redox switch, in which disulfide-linked dimerization lowers DNA-binding affinity 40–200-fold, further tunes activity [PMID:25866208, PMID:28161714]. ETV4 is activated downstream of HER2/Neu, HGF/c-Met, FGFR, and Ret through Ras-dependent ERK and JNK/SAPK MAPK pathways [PMID:9467955, PMID:10836994, PMID:19898483, PMID:33983905], and ERK phosphorylation at Ser73 stabilizes the protein by blocking COP1-mediated ubiquitination [PMID:28373072]. Activated ETV4 recruits the Mediator subunit MED25 through multivalent contacts that relieve its own autoinhibition, co-occupying enhancers and jointly driving target-gene transcription [PMID:28728983]. Its target program prominently includes matrix metalloproteinases (MMP-1, -3, -9, -13, MT1-MMP) and the uPA/uPAR and Rho/ROCK invasion machinery [PMID:7731700, PMID:10208438, PMID:16322223, PMID:29996935, PMID:30914208], cell-cycle regulators (Cyclin D1, Cyclin D3, and repression of CDKN1A/p21 with reduced p53) [PMID:17467662, PMID:29117940, PMID:32791988], and immune/chemokine effectors (PD-L1, CCL2, CXCL1/8, TNF-α) that reshape the tumor microenvironment [PMID:35296440, PMID:36907560, PMID:37670477]. ETV4 also acts as a transcriptional cofactor: it forms complexes with HIF-1/2α to co-activate hypoxia-inducible genes, with the estrogen receptor to license its genomic binding and chromatin accessibility, and with YAP to potentiate Hippo-pathway transcription [PMID:22075993, PMID:32046982, PMID:35296440]. Beyond oncogenesis, ETV4 functions redundantly with ETV5 in GDNF/Ret-driven ureteric bud branching and renal development, in motor and sensory neuron targeting, and in embryonic stem cell self-renewal [PMID:12372283, PMID:19898483, PMID:24089499, PMID:26224636, PMID:26894589].","teleology":[{"year":1991,"claim":"Established that ETV4 is a sequence-specific enhancer-binding factor with direct functional output, by showing it binds a defined element in the uPA promoter required for enhancer activity.","evidence":"DNase I footprinting, EMSA, and mutant reporter constructs on the uPA promoter","pmids":["1923525"],"confidence":"High","gaps":["Did not address upstream signals controlling ETV4","No genome-wide binding landscape"]},{"year":1996,"claim":"Linked ETV4 transcriptional activity to a tumor-relevant phenotype by showing forced expression confers invasion via MMP induction, defining its proteolytic invasion program.","evidence":"Stable E1AF transfection of MCF-7 cells with in vitro/in vivo invasion assays and MMP-1/3/9 reporter assays","pmids":["8570199","7731700"],"confidence":"High","gaps":["Direct vs indirect promoter binding not fully resolved for all MMPs","Did not address endogenous requirement"]},{"year":1997,"claim":"Placed ETV4 downstream of an oncogenic RTK by showing HER2/Neu activates it through dual Ras-dependent ERK and JNK pathways, and that ETV4 was required for invasion.","evidence":"Dominant-negative pathway-mutant reporter assays; antisense knockdown with invasion readouts","pmids":["9467955","9176403","9380403"],"confidence":"High","gaps":["Phosphosite targets within ETV4 not mapped at this stage","Autoregulatory loop based on reporter/EMSA only"]},{"year":2000,"claim":"Defined the domain architecture of ETV4, revealing a strong activation domain flanked by independent inhibitory regions and intrinsic autoinhibition of DNA binding.","evidence":"Deletion mutagenesis with transactivation reporters and antibody-relieved EMSA in COS cells","pmids":["11096072"],"confidence":"High","gaps":["Structural basis of autoinhibition unresolved","Did not identify partners that relieve autoinhibition"]},{"year":2002,"claim":"Demonstrated a developmental, non-oncogenic role by showing ETV4 coordinates motor neuron central positioning and terminal axon branching.","evidence":"Pea3 knockout mouse neuroanatomy and muscle innervation analysis","pmids":["12372283"],"confidence":"High","gaps":["Downstream transcriptional targets in neurons not defined here","Redundancy with ETV5 not addressed"]},{"year":2009,"claim":"Established ETV4/ETV5 as essential, dose-dependent effectors of GDNF/Ret signaling in kidney branching, identifying direct developmental target genes.","evidence":"Compound Etv4/Etv5 knockout mice with renal histology and target gene (Cxcr4, Met, Mmp14) analysis","pmids":["19898483","26894589"],"confidence":"High","gaps":["Direct promoter occupancy of renal targets not shown","Mechanism distinguishing migration from proliferation refined later"]},{"year":2011,"claim":"Revealed ETV4 acts as a transcriptional cofactor beyond direct DNA binding by forming a complex with HIF-1/2α to co-activate a subset of hypoxia-inducible genes.","evidence":"Mammalian two-hybrid, FRET, domain mapping, ChIP at PHD2 promoter, genome-wide expression profiling","pmids":["22075993"],"confidence":"High","gaps":["Stoichiometry/structure of ETV4-HIF complex unresolved","Scope limited to ~7.7% of hypoxic transcripts"]},{"year":2015,"claim":"Provided the structural mechanism of ETV4 DNA recognition and uncovered a redox-dependent regulatory switch via disulfide-linked dimerization.","evidence":"X-ray crystallography of ETS domain alone and DNA-bound, plus disulfide reduction and affinity measurements","pmids":["25866208"],"confidence":"High","gaps":["In vivo relevance of disulfide dimerization not established","Full-length protein not crystallized"]},{"year":2017,"claim":"Resolved the molecular basis of autoinhibition and its regulation, showing a C-terminal helix and a disordered acetylation-regulated N-terminal domain restrain DNA binding, and that MED25 relieves autoinhibition through multivalent contacts.","evidence":"Crystal structures, NMR, acetylation assays; NMR/ITC/SPR mapping plus ChIP-seq and knockdown for MED25","pmids":["28161714","28728983"],"confidence":"High","gaps":["Acetyltransferase responsible for NID acetylation not identified","In vivo MED25 dependency across contexts not fully mapped"]},{"year":2017,"claim":"Identified post-translational stabilization of ETV4, showing ERK phosphorylation at Ser73 blocks COP1-mediated ubiquitination and degradation.","evidence":"Ser73 mutagenesis, ETV4-COP1 Co-IP, ubiquitination assays under ERK modulation","pmids":["28373072"],"confidence":"Medium","gaps":["Single Co-IP for COP1 interaction without reciprocal validation in vivo","Quantitative contribution to steady-state ETV4 unclear"]},{"year":2013,"claim":"Demonstrated ETV4 selectively drives metastasis rather than primary tumor growth downstream of PI3K/Ras in prostate cancer.","evidence":"Pten-loss/Kras mouse model with lineage tracing and Etv4 shRNA knockdown in metastasis assays","pmids":["23918374"],"confidence":"High","gaps":["Metastasis-specific target genes not fully defined here","Mechanism separating growth from dissemination unresolved"]},{"year":2020,"claim":"Showed ETV4 is a licensing cofactor for estrogen receptor genomic binding, chromatin accessibility, and nuclear translocation, broadening its role to nuclear-receptor cooperativity.","evidence":"CRISPR ETV4 deletion with ER ChIP-seq, RNA-seq, ATAC-seq, and estrogen-dependent growth assays","pmids":["32046982"],"confidence":"High","gaps":["Direct ETV4-ER physical interaction not biochemically mapped","Pioneer vs cooperative role not distinguished"]},{"year":2022,"claim":"Extended ETV4's cofactor activity to the Hippo pathway and immune evasion by showing it binds YAP to augment YAP/TEAD4 transcription and induce myeloid-recruiting chemokines.","evidence":"Co-IP, nuclear fractionation, YAP/TEAD4 reporter, ChIP, in vivo immune phenotyping in HCC","pmids":["35296440","36907560","37670477"],"confidence":"Medium","gaps":["ETV4-YAP interaction surface not structurally defined","Co-IP-based interaction without reciprocal in vivo validation"]},{"year":2023,"claim":"Connected ETV4 to metabolic control by showing it drives HK1-dependent glycolysis/lactate to activate mTORC1, with an HDAC6-G3BP2 stress response engaged upon ETV4 loss.","evidence":"ETV4 knockdown, HK1 reporter, lactate/mTORC1 measurements, HDAC6-G3BP2 Co-IP, TSC2 deacetylation and lysosomal fractionation in NSCLC","pmids":["36823378"],"confidence":"Medium","gaps":["Single-lab pathway with Co-IP-based complexes","Direct ETV4 occupancy at HK1 not as deeply mapped as transcriptional output"]},{"year":2024,"claim":"Established ETV4 as a mediator of transcriptional plasticity and therapy resistance by showing it occupies IKZF1-bound enhancers to sustain MYC after IMiD-induced IKZF1 loss.","evidence":"ETV4 and IKZF1 ChIP-seq, CRISPR ETV4 deletion, viability assays in IMiD-resistant myeloma","pmids":["37934799"],"confidence":"Medium","gaps":["Mechanism of ETV4 recruitment to vacated enhancers unclear","Generality across other resistance settings untested"]},{"year":null,"claim":"How the distinct ETV4 regulatory layers — autoinhibition relief, acetylation, redox dimerization, MED25 multivalency, and cofactor partnerships (HIF, ER, YAP, IKZF1) — are integrated to select context-specific target programs remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking PTM state to partner choice","Endogenous ETV4 vs ETV1/ETV5 division of labor across tissues incompletely defined","Structure of full-length ETV4 in cofactor complexes lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,9,30,42]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,25,29,30]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[36,40,46]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,29,30]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,16,31,48]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,23,34,50,51]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[13,19,24,26,28]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[1,8,34]}],"complexes":[],"partners":["MED25","HIF1A","YAP1","SP1","COP1","ESR1","TEAD4","IKZF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P43268","full_name":"ETS translocation variant 4","aliases":["Adenovirus E1A enhancer-binding protein","E1A-F","Polyomavirus enhancer activator 3 homolog","Protein PEA3"],"length_aa":484,"mass_kda":53.9,"function":"Transcriptional activator (PubMed:19307308, PubMed:31552090). Regulates the positioning of motor neurons within the lateral medial column of the spinal cord and controls the terminal arborization of specific motor neuron axons within their target muscles (By similarity). Required for the expression of CDH8 and SEMA3E in ETV4-expressing motor neurons and for the exclusion of CDH7 expression from these neurons (By similarity). May play a role in keratinocyte differentiation (PubMed:31552090) (Microbial infection) Binds to the enhancer of the adenovirus E1A gene and acts as a transcriptional activator; the core-binding sequence is 5'-[AC]GGA[AT]GT-3'","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P43268/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ETV4","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ETV4","total_profiled":1310},"omim":[{"mim_id":"620738","title":"ZONE OF POLARIZING ACTIVITY REGULATORY SEQUENCE; ZRS","url":"https://www.omim.org/entry/620738"},{"mim_id":"609031","title":"EPIDIDYMAL PROTEASE INHIBITOR; EPPIN","url":"https://www.omim.org/entry/609031"},{"mim_id":"608067","title":"RING FINGER AND WD REPEAT DOMAINS-CONTAINING PROTEIN 2; RFWD2","url":"https://www.omim.org/entry/608067"},{"mim_id":"606764","title":"GASTROINTESTINAL STROMAL TUMOR; GIST","url":"https://www.omim.org/entry/606764"},{"mim_id":"605755","title":"DOUBLECORTIN DOMAIN-CONTAINING PROTEIN 2; DCDC2","url":"https://www.omim.org/entry/605755"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoli rim","reliability":"Supported"},{"location":"Mitotic chromosome","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ETV4"},"hgnc":{"alias_symbol":["E1A-F","E1AF","PEA3"],"prev_symbol":[]},"alphafold":{"accession":"P43268","domains":[{"cath_id":"1.10.10.10","chopping":"344-432","consensus_level":"high","plddt":94.296,"start":344,"end":432}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P43268","model_url":"https://alphafold.ebi.ac.uk/files/AF-P43268-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P43268-F1-predicted_aligned_error_v6.png","plddt_mean":56.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ETV4","jax_strain_url":"https://www.jax.org/strain/search?query=ETV4"},"sequence":{"accession":"P43268","fasta_url":"https://rest.uniprot.org/uniprotkb/P43268.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P43268/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P43268"}},"corpus_meta":[{"pmid":"16585160","id":"PMC_16585160","title":"TMPRSS2:ETV4 gene 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retardation (EMSA), transient transfection with deletion and point-mutant reporter constructs\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro DNA-binding assays combined with mutagenesis and reporter gene assays; multiple orthogonal methods in single study\",\n      \"pmids\": [\"1923525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"E1AF (ETV4) transcriptionally activates three different subclasses of matrix metalloproteinase (MMP) gene promoters (stromelysin/MMP-3, type I collagenase/MMP-1, and 92 kDa type IV collagenase/MMP-9), increasing CAT reporter activity ~10–20-fold in transient expression assays.\",\n      \"method\": \"Transient co-transfection reporter (CAT) assays with MMP promoter constructs\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean functional reporter assay with three independent MMP promoters; single lab but multiple substrates tested\",\n      \"pmids\": [\"7731700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Transfection of E1AF (ETV4) expression plasmid into non-invasive MCF-7 breast cancer cells confers invasive and motile activities accompanied by increased MMP-9 expression, establishing a direct functional link between E1AF and tumor cell invasion.\",\n      \"method\": \"Stable transfection of E1AF expression vector into MCF-7 cells, in vitro invasion assay, in vivo tumor implantation, Northern blot for MMP-9\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function in non-invasive cells with functional invasion readout and molecular mechanism (MMP-9 induction); replicated in vivo\",\n      \"pmids\": [\"8570199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"PEA3 (ETV4) transactivates the vimentin gene promoter through a PEA3 binding site, as shown by transient transfection assays in mammary epithelial and tumor cell lines.\",\n      \"method\": \"Transient transfection reporter assay with vimentin promoter constructs in multiple cell lines\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter assay with site-specific evidence; single lab, two cell line contexts\",\n      \"pmids\": [\"8895512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"E1AF (ETV4) activates the human p21(Waf1/Cip1) promoter by interacting with Ets-binding sites near p53-responsive elements, in a p53-independent manner, as demonstrated by deletion of EBS abolishing activity in p53-null cells.\",\n      \"method\": \"Transient transfection reporter assay with p21 promoter constructs (wild-type and EBS deletion mutants) in SiHa and Saos2 cells; Northern blot showing correlation of p21 and E1AF under cisplatin treatment\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis of EBS in reporter combined with expression correlation; single lab\",\n      \"pmids\": [\"9223430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Antisense E1AF (ETV4) transfection in HSC3 oral squamous cell carcinoma cells reduces MMP-1, -3, and -9 expression and decreases invasive potential both in vitro and in vivo, establishing a required role of E1AF in MMP-driven invasion.\",\n      \"method\": \"Antisense expression vector transfection, mRNA/protein quantification, in vitro 3D raft invasion culture, in vivo nude mouse implantation\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with multiple orthogonal invasion readouts (in vitro and in vivo) plus molecular mechanism (MMP downregulation)\",\n      \"pmids\": [\"9176403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"PEA3 (ETV4) is a downstream target of the HER2/Neu receptor tyrosine kinase; HER2/Neu upregulates PEA3 transcriptional activity through two Ras-dependent MAPK pathways (ERK and SAPK/JNK), as demonstrated using dominant-negative signaling mutants.\",\n      \"method\": \"Co-transfection reporter assay with constitutively active HER2/Neu and dominant-negative Ras (Rap1a), ERK pathway mutants, and JNK pathway mutants; ERK/JNK kinase activation assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic pathway dissection with dominant-negative mutants targeting multiple nodes; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"9467955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"HER2/Neu overexpression initiates a signaling cascade that increases PEA3 (ETV4) transcriptional activity; transcriptionally activated PEA3 stimulates both HER2/neu and PEA3 gene transcription by binding to sites in their promoters, forming an autoregulatory loop.\",\n      \"method\": \"Reporter assay, EMSA/DNA-binding to HER2 and PEA3 promoters, co-transfection experiments in breast cancer cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter and binding assays; single lab\",\n      \"pmids\": [\"9380403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"E1AF (ETV4) overexpression in fibrosarcoma cells induces MT1-MMP expression, activates secreted pro-MMP-2, and increases cell motility and invasion, contributing to metastatic capacity in vivo.\",\n      \"method\": \"Stable transfection of E1AF cDNA into QR-32 fibrosarcoma cells, MMP-2/MT1-MMP expression analysis, in vitro motility/invasion assays, in vivo pulmonary metastasis assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function with mechanistic readout (MT1-MMP induction and MMP-2 activation) plus in vivo validation; single lab\",\n      \"pmids\": [\"10208438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"PEA3 (ETV4) contains multiple functional domains: a strong N-terminal activation domain flanked by two inhibitory regions that independently suppress activity, and the ETS domain plus flanking regions that independently inhibit DNA binding in mammalian cells; antibody relief of autoinhibition was required to detect DNA binding in vitro.\",\n      \"method\": \"Deletion mutagenesis in COS cells with reporter assays (transactivation domain mapping); EMSA with PEA3 deletion mutants and PEA3-specific antibody\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic mutagenesis with both transcriptional activation and DNA-binding functional assays; multiple orthogonal methods in single study\",\n      \"pmids\": [\"11096072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"HGF upregulates E1AF (ETV4) expression, which in turn activates MMP-1, -3, and -9 promoters through Ets-binding sites, driving oral cancer cell invasion; antisense E1AF blocks HGF-induced MMP upregulation and invasion.\",\n      \"method\": \"HGF treatment of HSC3 cells, RT-PCR for E1AF/MMP mRNAs, CAT reporter assays with wild-type and Ets-site-mutant MMP-9 promoters, organotypic raft invasion culture\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — promoter mutagenesis combined with antisense knockdown and functional invasion assay; multiple orthogonal methods\",\n      \"pmids\": [\"10836994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PEA3 (ETV4) is upregulated in response to Wnt1 expression in mammary epithelial cells and potently activates COX-2 transcription; the NF-IL6 site in the COX-2 promoter is important for PEA3 responsiveness, as shown by promoter mapping.\",\n      \"method\": \"Transient transfection reporter assay with COX-2 promoter deletion constructs in Wnt1-expressing cells; Western blot for PEA3 in Wnt1 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter deletion mapping with Wnt1 gain-of-function context; single lab\",\n      \"pmids\": [\"11274170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Each member of the pea3 subfamily (pea3/ETV4, er81/ETV1, erm/ETV5) is coordinately overexpressed in MMTV-neu mammary tumors; expression of a dominant-negative pea3 transgene in MMTV-neu mice dramatically delayed mammary tumor onset and reduced tumor number/size, establishing a required role for PEA3 factors in HER2/Neu-mediated oncogenesis.\",\n      \"method\": \"Transgenic mouse model (MMTV-neu × MMTV-dominant-negative-pea3 bitransgenic), tumor latency/incidence monitoring, RT-PCR for transgene expression in tumors\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function in an in vivo mammalian cancer model with clear phenotypic readout\",\n      \"pmids\": [\"11719215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"In Pea3 (ETV4) mutant mice, specific motor neuron pools fail to arborize normally within target muscles and are mispositioned within the spinal cord, establishing that peripherally-induced ETS gene expression coordinates central positioning and terminal branching of spinal motor neurons.\",\n      \"method\": \"Pea3 knockout mouse analysis, histological examination of muscle innervation, spinal cord neuroanatomy\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function in vivo with defined structural neuronal phenotype; replicated across independent observations\",\n      \"pmids\": [\"12372283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PEA3 (ETV4) cooperates with beta-catenin/Lef-1 and c-Jun to activate osteopontin (OPN) transcription; co-transfection of all four factors increased luciferase expression ~280-fold and induced endogenous OPN in a rat mammary cell line.\",\n      \"method\": \"Transient transfection reporter assay with OPN promoter-luciferase, co-transfection of beta-catenin, Lef-1, PEA3, and c-Jun in various combinations; endogenous OPN induction by RT-PCR\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — combinatorial co-transfection with endogenous gene readout; single lab\",\n      \"pmids\": [\"14990565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"E1AF (ETV4) binds to and activates the β1,4-galactosyltransferase I (GalT I) promoter through an Ets-binding site at -205 to -200; stable transfection of E1AF in low-metastatic cells increased GalT I expression and cell migration.\",\n      \"method\": \"Deletion and mutation analysis of GalT I promoter-luciferase reporter, EMSA with anti-E1AF antibody, stable transfection and migration assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — EMSA plus promoter mutagenesis plus functional gain-of-function; single lab\",\n      \"pmids\": [\"15611127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"E1AF (ETV4) activates the Rho/Rho-associated kinase (ROCK) pathway in NSCLC cells: E1AF-transfected cells have increased GTP-bound Rho and higher myosin light chain phosphorylation (a ROCK effector), and ROCK inhibitor Y27632 suppresses E1AF-induced motility, invasion, and tumorigenesis.\",\n      \"method\": \"Rho activation assay (GTP-bound Rho pull-down), MLC phosphorylation Western blot, ROCK inhibitor treatment, in vitro motility/invasion assays, in vivo nude mouse tumor/metastasis assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pathway dissection with pharmacological inhibitor plus biochemical readouts of Rho/ROCK activity and in vivo validation; multiple orthogonal methods\",\n      \"pmids\": [\"16322223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"E1AF (ETV4) forms a protein complex with Sp1, contributes to Sp1 phosphorylation, and functions as a mediator between EGF signaling and Sp1 transcriptional activity; Sp1 brings E1AF to the GalT V promoter to activate its transcription and promote glioma invasion.\",\n      \"method\": \"Co-immunoprecipitation (E1AF-Sp1 complex), Sp1 phosphorylation Western blot, ChIP assay on GalT V promoter, reporter assay, invasion assay in glioma cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP plus functional invasion assay; single lab\",\n      \"pmids\": [\"17938207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"E1AF (ETV4) promotes breast cancer cell cycle progression by directly upregulating Cyclin D3 transcription; E1AF RNAi reduces Cyclin D3 expression and cell cycle progression, and forced Cyclin D3 expression rescues the E1AF knockdown phenotype.\",\n      \"method\": \"Luciferase reporter assay for Cyclin D3 promoter activity, siRNA knockdown, rescue by Cyclin D3 overexpression, flow cytometry cell cycle analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay, RNAi knockdown, and epistatic rescue experiment; single lab\",\n      \"pmids\": [\"17467662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Etv4 and Etv5 are positively regulated by GDNF/Ret signaling in ureteric bud tips; mice lacking both Etv4 alleles and one Etv5 allele show renal agenesis/hypodysplasia, and double homozygous knockouts have complete renal failure; Etv4/Etv5 are required for expression of Cxcr4, Myb, Met, and Mmp14 in the ureteric bud.\",\n      \"method\": \"Mouse genetic knockouts (Etv4-/- , Etv5-/-, compound mutants), renal histology, gene expression analysis (Cxcr4, Myb, Met, Mmp14), Ret signaling context\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — compound genetic knockouts in vivo with defined downstream target gene identification and dose-dependent phenotypes\",\n      \"pmids\": [\"19898483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PEA3/ETV4 controls proliferation and invasive properties of oesophageal adenocarcinoma cells; a key target gene is MMP-1; the ERK MAP kinase pathway activates PEA3 and drives the ERK-PEA3-MMP-1 signaling axis.\",\n      \"method\": \"siRNA knockdown of PEA3, proliferation and invasion assays, MMP-1 reporter assay, ERK pathway inhibition experiments, ChIP or reporter assays\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi loss-of-function with dual phenotypic readout and molecular target identification; single lab\",\n      \"pmids\": [\"21143918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ETV4 (PEA3) acts as a broad coactivator of HIF signaling: ETV4 forms a complex with HIF-1/2α (demonstrated by mammalian two-hybrid and FRET), and the complex is recruited to the PHD2 promoter (confirmed by ChIP); 7.7% of hypoxically induced transcripts require ETV4 for efficient induction.\",\n      \"method\": \"Mammalian two-hybrid assay, FRET, HIF-1α domain mapping, CITED2 overexpression, factor inhibiting HIF depletion, ChIP for ETV4 and HIF-1α at PHD2 promoter, genome-wide expression profiling\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (two-hybrid, FRET, domain mapping, ChIP, genome-wide profiling) establishing complex formation and genomic co-occupancy in single study\",\n      \"pmids\": [\"22075993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PEA3 (ETV4) directly activates Notch-1 transcription (AP-1-independent) and Notch-4 transcription (c-JUN-dependent) in breast cancer cells; ChIP confirmed PEA3 enrichment on both Notch-1 and Notch-4 promoters; PEA3 recruitment to Notch-4 requires c-JUN.\",\n      \"method\": \"siRNA knockdown of PEA3, RT-PCR and Western blot for Notch receptors, ChIP for PEA3 on Notch-1 and Notch-4 promoters, Notch-4 luciferase reporter assay, TAM-67 and c-Jun siRNA to dissect AP-1 dependency\",\n      \"journal\": \"Breast cancer research : BCR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP confirmation of direct promoter binding combined with reporter assay and mechanistic dissection (c-JUN dependency) via multiple approaches\",\n      \"pmids\": [\"21679465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Etv4 promotes prostate cancer metastasis downstream of co-activated PI3-kinase/Ras signaling; Etv4 knockdown abrogates the metastatic phenotype of cells derived from Pten-loss/Kras-activation mouse model without affecting primary tumor growth.\",\n      \"method\": \"Genetically engineered mouse model (Pten loss + oncogenic Kras), lineage tracing with fluorescent reporter, Etv4 shRNA knockdown in derived metastatic cell line, in vivo metastasis assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic model combined with lineage tracing and targeted knockdown with defined metastasis vs growth phenotype dissection\",\n      \"pmids\": [\"23918374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Etv4 and Etv5 mediate NGF retrograde signaling and axonal growth of DRG sensory neurons; distal axon NGF application induces Etv4/Etv5 mRNA via MEK/ERK pathway; Etv4/Etv5 siRNA knockdown inhibits NGF-induced neurite outgrowth, while overexpression of Etv4 or Etv5 potentiates it.\",\n      \"method\": \"Compartmentalized DRG neuron cultures with distal NGF application, real-time PCR, pharmacological MEK/ERK inhibition, siRNA knockdown, overexpression gain-of-function, neurite outgrowth assay\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — both gain- and loss-of-function in primary neurons with pathway dissection (MEK/ERK) and retrograde signaling paradigm; multiple methods\",\n      \"pmids\": [\"24089499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structures of the ETV4 ETS DNA-binding domain, alone and in complex with DNA, revealed that: (1) DNA backbone contacts account for most binding affinity; (2) a coordinated water network mediates base selection upstream of the GGAA core; (3) ETV4 crystallizes as a disulfide-linked dimer via a novel interface, and reduction to monomers increases DNA binding affinity 40–200-fold, revealing a redox-dependent regulatory mechanism.\",\n      \"method\": \"X-ray crystallography (crystal structures alone and in complex with DNA), disulfide bond reduction experiments, DNA-binding affinity measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures with functional validation of redox regulation; multiple orthogonal methods\",\n      \"pmids\": [\"25866208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Etv4 and Etv5 are specifically expressed in undifferentiated ES cells downstream of Oct3/4; double knockout reduces ES cell proliferation (with upregulation of CDK inhibitors p16/p19, p15, p57) and impairs induction of ectoderm differentiation markers; Etv4/Etv5 regulate stem cell genes Tcf15 and Gbx2.\",\n      \"method\": \"ES cell double knockout by gene targeting, proliferation assay, flow cytometry, embryoid body differentiation assay, microarray gene expression analysis, rescue by Etv4/Etv5 re-expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — double knockout with rescue, proliferation and differentiation phenotype plus molecular target identification; single lab\",\n      \"pmids\": [\"26224636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ACLY and ACC1 regulate ETV4 protein levels via α-ketoglutarate under hypoxia; loss of ACLY/ACC1 paradoxically increases α-ketoglutarate under hypoxia, which reduces ETV4 expression and activity likely via an epigenetic mechanism; ETV4 knockdown recapitulates the anti-apoptotic transcriptional program of ACLY/ACC1 depletion.\",\n      \"method\": \"Genome-wide shRNA screen, ETV4 siRNA knockdown, metabolomics (α-ketoglutarate measurement), α-ketoglutarate supplementation, transcriptional profiling, apoptosis assays\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — shRNA screen plus metabolomic rescue experiment; mechanism (epigenetic) inferred but not fully established; single lab\",\n      \"pmids\": [\"26452058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Ret and Etv4 signaling promote directed cell movements (rather than proliferation) of ureteric bud tip progenitor cells during renal branching morphogenesis; Etv4-/- cells tend to lag behind wild-type sister cells and contribute only to trunks rather than tips.\",\n      \"method\": \"Mosaic Analysis with Double Markers (MADM) for single-cell lineage tracing in Etv4 mutant/wild-type chimeric kidneys, time-lapse organ culture imaging\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — sophisticated single-cell genetic mosaic analysis with live imaging clearly separating proliferation from directed movement\",\n      \"pmids\": [\"26894589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ETV4 interacts with MED25 (Mediator subunit 25) through two independent regions: the N-terminal activation domain (AD) and the ETS DNA-binding domain (DBD); the DBD can simultaneously contact all three MED25 sites while the AD contacts one site, creating a high-affinity multivalent interaction; MED25 stimulates ETV4 DNA binding by relieving autoinhibition; ETV4 and MED25 co-occupy enhancers in prostate cancer cells and are jointly required for target gene transcription.\",\n      \"method\": \"NMR chemical shift perturbation, ITC/SPR binding kinetics, domain mapping, crystal structure context, ChIP-seq for ETV4 and MED25, siRNA knockdown + gene expression in prostate cancer cells\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR-based interaction mapping combined with genome-wide ChIP-seq and functional gene expression in cells; multiple orthogonal methods\",\n      \"pmids\": [\"28728983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ETV4 (and ETV1/ETV5) DNA binding is autoinhibited by two independent inhibitory regions flanking the ETS domain: a C-terminal α-helix that packs against the ETS domain and perturbs the DNA-recognition helix (resolved by crystal structure), and an intrinsically disordered N-terminal inhibitory domain (NID) that makes transient intramolecular contacts with the DNA-recognition helix (resolved by NMR); acetylation of lysines in the NID activates DNA binding.\",\n      \"method\": \"Crystal structures of ETV1/4/5, NMR spectroscopy, deletion mutagenesis, acetylation functional assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures plus NMR plus mutagenesis plus PTM functional assay in a single mechanistic study\",\n      \"pmids\": [\"28161714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ERK kinase phosphorylates ETV4 at Ser73, which blocks ETV4 binding to the E3 ubiquitin ligase COP1, thereby preventing ubiquitination and proteasomal degradation of ETV4 and stabilizing the protein.\",\n      \"method\": \"ERK activation/inhibition experiments, Western blot for ETV4 protein levels, site-directed mutagenesis (Ser73), co-immunoprecipitation of ETV4-COP1, ubiquitination assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation site mutagenesis and Co-IP for ETV4-COP1 interaction; single lab, moderate mechanistic depth\",\n      \"pmids\": [\"28373072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ETV4 directly regulates Cyclin D1 (CCND1) transcription to promote G1-to-S phase cell cycle progression in pancreatic cancer cells; forced Cyclin D1 expression rescues growth inhibition caused by ETV4 silencing.\",\n      \"method\": \"shRNA-mediated ETV4 silencing in ASPC1 and Colo357 cells, ectopic ETV4 expression in BXPC3 cells, reporter assay and ChIP for Cyclin D1 promoter, flow cytometry cell cycle analysis, rescue by Cyclin D1 re-expression\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay and rescue epistasis; single lab, two cell line contexts\",\n      \"pmids\": [\"29117940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CIC (Capicua) transcriptionally represses ETV4; loss of CIC leads to ETV4 upregulation, which in turn induces MMP1 expression; MMP1 knockdown completely blocks CIC-deficiency-induced HCC cell proliferation and invasion, establishing the CIC-ETV4-MMP1 axis.\",\n      \"method\": \"CIC overexpression/knockdown in HCC cells, RT-PCR/Western blot for ETV4 and MMP1, MMP1 siRNA rescue, in vivo tumor growth assay\",\n      \"journal\": \"Hepatology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistatic knockdown rescue defines pathway order; single lab\",\n      \"pmids\": [\"29251790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ETV4 directly regulates MMP13 transcription in mammary epithelial cells; MMP13 contributes to ETV4-induced proliferation, migration, invasion, and anchorage-independent growth; MMP13 inhibition blocks tumor formation induced by ETV4 in immunodeficient mice.\",\n      \"method\": \"MMP13 promoter-luciferase reporter assays with ETV4 constructs, MMP13 overexpression/knockdown rescue experiments, in vitro proliferation/migration/invasion assays, in vivo xenograft tumorigenicity assay\",\n      \"journal\": \"Breast cancer research : BCR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct promoter regulation confirmed, rescue epistasis, and in vivo validation; multiple orthogonal methods\",\n      \"pmids\": [\"29996935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PBK kinase enhances the binding of ETV4 to the uPAR promoter (shown by ChIP), increasing uPAR expression and HCC cell migration/invasion; ETV4 is the transcription factor directly binding the core uPAR promoter region.\",\n      \"method\": \"ChIP assay for ETV4 on uPAR promoter ± PBK, PBK gain/loss-of-function, uPAR overexpression rescue in PBK knockdown, orthotopic mouse model\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with functional epistasis rescue; single lab\",\n      \"pmids\": [\"30914208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Phosphorylation of ETV4 at tyrosine 392 by tyrosine kinase PTK6 increases nuclear translocation of ETV4 and is essential for its function in promoting CXCL1/8 expression, tumor-associated neutrophil recruitment, lymphangiogenesis, and lymph node metastasis in bladder cancer.\",\n      \"method\": \"PTK6-ETV4 interaction and phosphorylation assay, Y392 site-directed mutagenesis, nuclear/cytoplasmic fractionation, CXCL1/8 reporter assay, in vivo lymph node metastasis models\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PTM site mutagenesis with nuclear translocation and functional consequences; single lab\",\n      \"pmids\": [\"36670069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ETV4 transcriptionally upregulates ZEB1 (a strong EMT inducer) via the S100A8/A9-MCAM-ETV4 axis in breast cancer cells, driving epithelial-mesenchymal transition, tumor growth, and lung metastasis.\",\n      \"method\": \"siRNA knockdown of MCAM and ETV4, Western blot and RT-PCR for ZEB1 and EMT markers, luciferase reporter assay for ZEB1 promoter, in vivo xenograft and metastasis assays\",\n      \"journal\": \"Neoplasia (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay and functional in vivo validation; single lab\",\n      \"pmids\": [\"31100639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ETV4 directly regulates PXN (paxillin) and MMP1 transcription in non-small cell lung cancer; ETV4-driven proliferation and migration are partially abolished by PXN and/or MMP1 inhibition.\",\n      \"method\": \"Microarray gain/loss-of-function, luciferase reporter assay for PXN and MMP1 promoters, siRNA knockdown of PXN and MMP1, proliferation and migration assays\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay plus epistatic inhibition; single lab\",\n      \"pmids\": [\"31670855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ETV4 transcriptionally upregulates MSI2 by directly binding to its promoter (confirmed by ChIP and luciferase reporter), promoting lung adenocarcinoma proliferation and invasion; ectopic MSI2 rescues the effects of ETV4 knockdown.\",\n      \"method\": \"ChIP assay for ETV4 at MSI2 promoter, luciferase reporter assay, ETV4 shRNA knockdown, MSI2 re-expression rescue, CCK8/invasion assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter plus epistatic rescue; single lab\",\n      \"pmids\": [\"31253395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ETV4 deletion (CRISPR/Cas9) in endometrial cancer cells greatly reduces estrogen receptor (ER) genomic binding at the majority of ER-bound loci, dampens the gene expression response to estradiol, reduces chromatin accessibility at some ER-bound loci, and impairs ER nuclear translocation; ETV4 loss decreases estrogen-dependent growth in 3D culture and in vivo.\",\n      \"method\": \"CRISPR/Cas9 homozygous ETV4 deletion, ChIP-seq for ER binding, RNA-seq after estradiol treatment, ATAC-seq for chromatin accessibility, nuclear translocation assay, 3D organoid culture, in vivo estrogen-dependent growth assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — clean genetic deletion with genome-wide ChIP-seq, ATAC-seq, and transcriptomics plus functional in vitro and in vivo validation; multiple orthogonal methods\",\n      \"pmids\": [\"32046982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ETV4 directly binds the FOSL1 promoter to increase FOSL1 expression in clear cell renal cell carcinoma via an AKT-dependent manner; the ETV4/FOSL1 axis promotes ccRCC cell migration and metastasis.\",\n      \"method\": \"ChIP for ETV4 on FOSL1 promoter, reporter assay, AKT inhibition experiments, in vitro migration/invasion assays, in vivo metastasis assay\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter plus AKT pathway inhibition; single lab\",\n      \"pmids\": [\"32305558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ETV4 directly binds the CDKN1A (p21) promoter at -704/-696 bp upstream of TSS (confirmed by ChIP and luciferase assay) to repress p21 expression; ETV4 also reduces p53 protein levels; in a transgenic mouse model of prostate-specific ETV4 expression, both p21 and p27 are decreased and prostatic intraepithelial neoplasia develops.\",\n      \"method\": \"Transgenic mouse model (prostate-specific ETV4), ChIP for ETV4 at CDKN1A promoter, luciferase reporter assay with CDKN1A promoter, Western blot for p21/p27/p53 in mouse prostate\",\n      \"journal\": \"Journal of hematology & oncology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo transgenic model plus ChIP plus reporter mutagenesis; multiple orthogonal methods across in vitro and in vivo\",\n      \"pmids\": [\"32791988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ETV4 and ETV5 are expressed in synovial sarcoma downstream of FGFR signaling (driven by SS18-SSX fusion); ETV4/ETV5 knockdown inhibits synovial sarcoma growth primarily through cell cycle control, and causes striking upregulation of DUX4 and its transcriptional targets.\",\n      \"method\": \"FGFR genetic knockout models, FGFR inhibitor BGJ398 treatment, ETV4/ETV5 siRNA knockdown, transcriptome analysis, FGFR inhibitor + xenograft assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic FGFR knockout and pharmacological inhibition plus ETV4/ETV5 knockdown with transcriptome readout; single lab\",\n      \"pmids\": [\"33983905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ETV4 promotes breast cancer stemness by transcriptionally activating glycolytic genes (HK2, LDHA) and CXCR4, thereby activating Sonic Hedgehog signaling; ETV4 knockdown reduces glucose uptake, lactate release, and BCSC maintenance.\",\n      \"method\": \"ETV4 knockdown/overexpression, glucose uptake and lactate assays, CXCR4 promoter reporter assay, sphere formation assay for stemness, xenograft assay\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay for CXCR4 plus metabolic and stemness functional assays; single lab\",\n      \"pmids\": [\"34052833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ETV4 directly binds the CXCR5 promoter to increase CXCR5 expression in pancreatic ductal adenocarcinoma; CXCL13 increases ETV4 expression via ERK1/2 pathway; the CXCL13/ETV4/CXCR5 axis forms a positive feedback loop promoting PDAC invasion and metastasis.\",\n      \"method\": \"ChIP for ETV4 on CXCR5 promoter, CXCR5 promoter luciferase reporter, ERK1/2 pathway inhibition, CXCR5 knockdown epistasis, CXCR5-neutralizing antibody, in vivo metastasis assay\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter plus epistatic knockdown rescue; single lab\",\n      \"pmids\": [\"34582976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ETV4 interacts directly with YAP; this interaction increases nuclear YAP accumulation and directly augments YAP/TEAD4-mediated transcriptional activation; the ETV4-YAP complex activates CXCL1 and CXCL5 to promote myeloid cell recruitment and tumor immune evasion in HCC.\",\n      \"method\": \"Co-immunoprecipitation (ETV4-YAP interaction), nuclear fractionation, luciferase reporter for YAP/TEAD4 targets, ChIP, in vivo transplanted tumor models with immune cell profiling\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus reporter assay plus in vivo immune phenotyping; single lab\",\n      \"pmids\": [\"35296440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HBx (HBV X protein) increases chromatin accessibility at the ETV4 locus via H3K27ac super-enhancer formation, upregulating ETV4 expression; elevated ETV4 then promotes HCC cell invasion and metastasis by transcriptionally upregulating DVL2 and activating Wnt/β-catenin signaling.\",\n      \"method\": \"H3K27ac ChIP-seq (super-enhancer mapping), RNA-seq, DVL2 reporter/Western blot, Wnt/β-catenin pathway readouts, in vitro invasion assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq defining chromatin mechanism plus functional target validation; single lab\",\n      \"pmids\": [\"35121725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ETV4 transcriptionally activates PD-L1 and CCL2 expression in HCC cells, increasing tumor-associated macrophage and MDSC infiltration and inhibiting CD8+ T-cell accumulation; FGF19/FGFR4 and HGF/c-MET upregulate ETV4 via ERK1/2 pathway; ETV4 also upregulates FGFR4, creating a FGF19-ETV4-FGFR4 positive feedback loop.\",\n      \"method\": \"ETV4 overexpression/knockdown in HCC cell lines, luciferase reporter assay for PD-L1 and CCL2 promoters, orthotopic mouse models, flow cytometry and immunofluorescence for immune cell profiling, ERK1/2 inhibition, CCR2 inhibitor treatment\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay plus in vivo immune phenotyping plus feedback loop dissection; single lab but multiple cancer-relevant readouts\",\n      \"pmids\": [\"36907560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ETV4 controls HK1 expression to regulate glycolysis-lactate production and thereby activates mTORC1 by relieving TSC2 repression of Rheb; when ETV4 is targeted and low-lactate stress ensues, HDAC6 deacetylates TSC2 (stabilizing it), and G3BP2 recruits lysosomal-TSC2 to suppress mTORC1; HDAC6-G3BP2 complex is required for this adaptive stress response.\",\n      \"method\": \"ETV4 knockdown in NSCLC cells, HK1 reporter assay, lactate/mTORC1 activity measurements, HDAC6-G3BP2 co-IP, TSC2 deacetylation and stability assays, lysosomal fractionation, perinuclear mTOR distribution imaging\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway dissection with biochemical assays (Co-IP, deacetylation, fractionation); single lab\",\n      \"pmids\": [\"36823378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ETV4 transcriptionally activates TNF-α and MAPK11 expression; hepatocyte-specific ETV4 knockout reduces DEN-CCL4-induced HCC development and decreases hepatic TNF-α, MAPK11, and macrophage accumulation, while hepatocyte-specific ETV4 transgenic expression promotes HCC growth.\",\n      \"method\": \"Hepatocyte-specific ETV4 knockout (ETV4fl/fl, alb-cre) and transgenic (ETV4Hep-TG) mice, DEN-CCL4 HCC model, luciferase reporter for TNF-α and MAPK11 promoters, immunoblotting, histology\",\n      \"journal\": \"Cancer communications (London, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic models (KO and TG) with defined pathway targets and in vivo disease phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"37670477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ETV4 binds to IKZF1-bound enhancers in multiple myeloma cells and maintains MYC and other oncogene expression after IMiD-mediated IKZF1 depletion; CRISPR/Cas9 ablation of ETV4 sensitizes IMiD-resistant MM cells, establishing ETV4 as a mediator of transcriptional plasticity and IMiD resistance.\",\n      \"method\": \"ChIP-seq for ETV4 and IKZF1, CRISPR/Cas9 ETV4 deletion, gene expression analysis, cell viability assays in IMiD-resistant vs sensitive cells\",\n      \"journal\": \"Blood cancer discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq showing co-occupancy plus CRISPR genetic deletion with defined resistance phenotype; single lab\",\n      \"pmids\": [\"37934799\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ETV4 (PEA3/E1AF) is an ETS-family transcription factor whose DNA-binding activity is autoinhibited by flanking N-terminal (intrinsically disordered, regulated by lysine acetylation) and C-terminal (α-helical) inhibitory domains, and further controlled by a redox switch (disulfide-linked dimerization reduces DNA-binding affinity 40–200-fold); it is activated downstream of receptor tyrosine kinase signaling (HER2/Neu, FGFR, Ret, HGF/c-Met) via Ras-dependent ERK and JNK/SAPK MAPK pathways, with ERK phosphorylation at Ser73 also stabilizing the protein by blocking COP1-mediated ubiquitination; activated ETV4 recruits the Mediator complex through multivalent interactions with MED25, co-occupies enhancers with AP1 factors, and transcriptionally drives a broad target gene program including multiple matrix metalloproteinases (MMP-1, -3, -7, -9, -13, MT1-MMP), invasion/metastasis effectors (uPA/uPAR, Rho/ROCK pathway), cell-cycle regulators (Cyclin D1, Cyclin D3; repression of p21 via direct CDKN1A promoter binding and p53 reduction), immune modulators (PD-L1, CCL2, CXCL1/8, TNF-α), developmental regulators (Cxcr4, Met, Mmp14 in the kidney; Notch-1/4 in breast cancer), and co-activating HIF-1/2α at hypoxia-inducible gene promoters; additionally, ETV4 interacts with YAP to potentiate Hippo pathway transcription and controls mTORC1 activity through HK1-driven glycolysis/lactate production, collectively establishing it as a multifunctional oncogenic transcription factor that integrates growth factor, metabolic, and epigenetic signals to drive invasion, metastasis, stemness, and immune evasion across diverse tissue contexts.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ETV4 (PEA3/E1AF) is an ETS-family transcription factor that integrates receptor tyrosine kinase signaling into a transcriptional program driving tumor cell invasion, metastasis, proliferation, and immune modulation across diverse tissues [#0, #2, #23]. Its DNA-binding activity is intrinsically autoinhibited by two independent elements flanking the ETS domain: a C-terminal α-helix that perturbs the DNA-recognition helix and an intrinsically disordered N-terminal inhibitory domain whose lysine acetylation relieves repression; an additional redox switch, in which disulfide-linked dimerization lowers DNA-binding affinity 40–200-fold, further tunes activity [#25, #30]. ETV4 is activated downstream of HER2/Neu, HGF/c-Met, FGFR, and Ret through Ras-dependent ERK and JNK/SAPK MAPK pathways [#6, #10, #19, #43], and ERK phosphorylation at Ser73 stabilizes the protein by blocking COP1-mediated ubiquitination [#31]. Activated ETV4 recruits the Mediator subunit MED25 through multivalent contacts that relieve its own autoinhibition, co-occupying enhancers and jointly driving target-gene transcription [#29]. Its target program prominently includes matrix metalloproteinases (MMP-1, -3, -9, -13, MT1-MMP) and the uPA/uPAR and Rho/ROCK invasion machinery [#1, #8, #16, #34, #35], cell-cycle regulators (Cyclin D1, Cyclin D3, and repression of CDKN1A/p21 with reduced p53) [#18, #32, #42], and immune/chemokine effectors (PD-L1, CCL2, CXCL1/8, TNF-α) that reshape the tumor microenvironment [#46, #48, #50]. ETV4 also acts as a transcriptional cofactor: it forms complexes with HIF-1/2α to co-activate hypoxia-inducible genes, with the estrogen receptor to license its genomic binding and chromatin accessibility, and with YAP to potentiate Hippo-pathway transcription [#21, #40, #46]. Beyond oncogenesis, ETV4 functions redundantly with ETV5 in GDNF/Ret-driven ureteric bud branching and renal development, in motor and sensory neuron targeting, and in embryonic stem cell self-renewal [#13, #19, #24, #26, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Established that ETV4 is a sequence-specific enhancer-binding factor with direct functional output, by showing it binds a defined element in the uPA promoter required for enhancer activity.\",\n      \"evidence\": \"DNase I footprinting, EMSA, and mutant reporter constructs on the uPA promoter\",\n      \"pmids\": [\"1923525\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address upstream signals controlling ETV4\", \"No genome-wide binding landscape\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Linked ETV4 transcriptional activity to a tumor-relevant phenotype by showing forced expression confers invasion via MMP induction, defining its proteolytic invasion program.\",\n      \"evidence\": \"Stable E1AF transfection of MCF-7 cells with in vitro/in vivo invasion assays and MMP-1/3/9 reporter assays\",\n      \"pmids\": [\"8570199\", \"7731700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect promoter binding not fully resolved for all MMPs\", \"Did not address endogenous requirement\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Placed ETV4 downstream of an oncogenic RTK by showing HER2/Neu activates it through dual Ras-dependent ERK and JNK pathways, and that ETV4 was required for invasion.\",\n      \"evidence\": \"Dominant-negative pathway-mutant reporter assays; antisense knockdown with invasion readouts\",\n      \"pmids\": [\"9467955\", \"9176403\", \"9380403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphosite targets within ETV4 not mapped at this stage\", \"Autoregulatory loop based on reporter/EMSA only\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined the domain architecture of ETV4, revealing a strong activation domain flanked by independent inhibitory regions and intrinsic autoinhibition of DNA binding.\",\n      \"evidence\": \"Deletion mutagenesis with transactivation reporters and antibody-relieved EMSA in COS cells\",\n      \"pmids\": [\"11096072\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of autoinhibition unresolved\", \"Did not identify partners that relieve autoinhibition\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated a developmental, non-oncogenic role by showing ETV4 coordinates motor neuron central positioning and terminal axon branching.\",\n      \"evidence\": \"Pea3 knockout mouse neuroanatomy and muscle innervation analysis\",\n      \"pmids\": [\"12372283\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream transcriptional targets in neurons not defined here\", \"Redundancy with ETV5 not addressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established ETV4/ETV5 as essential, dose-dependent effectors of GDNF/Ret signaling in kidney branching, identifying direct developmental target genes.\",\n      \"evidence\": \"Compound Etv4/Etv5 knockout mice with renal histology and target gene (Cxcr4, Met, Mmp14) analysis\",\n      \"pmids\": [\"19898483\", \"26894589\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct promoter occupancy of renal targets not shown\", \"Mechanism distinguishing migration from proliferation refined later\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed ETV4 acts as a transcriptional cofactor beyond direct DNA binding by forming a complex with HIF-1/2α to co-activate a subset of hypoxia-inducible genes.\",\n      \"evidence\": \"Mammalian two-hybrid, FRET, domain mapping, ChIP at PHD2 promoter, genome-wide expression profiling\",\n      \"pmids\": [\"22075993\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry/structure of ETV4-HIF complex unresolved\", \"Scope limited to ~7.7% of hypoxic transcripts\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided the structural mechanism of ETV4 DNA recognition and uncovered a redox-dependent regulatory switch via disulfide-linked dimerization.\",\n      \"evidence\": \"X-ray crystallography of ETS domain alone and DNA-bound, plus disulfide reduction and affinity measurements\",\n      \"pmids\": [\"25866208\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of disulfide dimerization not established\", \"Full-length protein not crystallized\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved the molecular basis of autoinhibition and its regulation, showing a C-terminal helix and a disordered acetylation-regulated N-terminal domain restrain DNA binding, and that MED25 relieves autoinhibition through multivalent contacts.\",\n      \"evidence\": \"Crystal structures, NMR, acetylation assays; NMR/ITC/SPR mapping plus ChIP-seq and knockdown for MED25\",\n      \"pmids\": [\"28161714\", \"28728983\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetyltransferase responsible for NID acetylation not identified\", \"In vivo MED25 dependency across contexts not fully mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified post-translational stabilization of ETV4, showing ERK phosphorylation at Ser73 blocks COP1-mediated ubiquitination and degradation.\",\n      \"evidence\": \"Ser73 mutagenesis, ETV4-COP1 Co-IP, ubiquitination assays under ERK modulation\",\n      \"pmids\": [\"28373072\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP for COP1 interaction without reciprocal validation in vivo\", \"Quantitative contribution to steady-state ETV4 unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated ETV4 selectively drives metastasis rather than primary tumor growth downstream of PI3K/Ras in prostate cancer.\",\n      \"evidence\": \"Pten-loss/Kras mouse model with lineage tracing and Etv4 shRNA knockdown in metastasis assays\",\n      \"pmids\": [\"23918374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Metastasis-specific target genes not fully defined here\", \"Mechanism separating growth from dissemination unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed ETV4 is a licensing cofactor for estrogen receptor genomic binding, chromatin accessibility, and nuclear translocation, broadening its role to nuclear-receptor cooperativity.\",\n      \"evidence\": \"CRISPR ETV4 deletion with ER ChIP-seq, RNA-seq, ATAC-seq, and estrogen-dependent growth assays\",\n      \"pmids\": [\"32046982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ETV4-ER physical interaction not biochemically mapped\", \"Pioneer vs cooperative role not distinguished\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended ETV4's cofactor activity to the Hippo pathway and immune evasion by showing it binds YAP to augment YAP/TEAD4 transcription and induce myeloid-recruiting chemokines.\",\n      \"evidence\": \"Co-IP, nuclear fractionation, YAP/TEAD4 reporter, ChIP, in vivo immune phenotyping in HCC\",\n      \"pmids\": [\"35296440\", \"36907560\", \"37670477\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ETV4-YAP interaction surface not structurally defined\", \"Co-IP-based interaction without reciprocal in vivo validation\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Connected ETV4 to metabolic control by showing it drives HK1-dependent glycolysis/lactate to activate mTORC1, with an HDAC6-G3BP2 stress response engaged upon ETV4 loss.\",\n      \"evidence\": \"ETV4 knockdown, HK1 reporter, lactate/mTORC1 measurements, HDAC6-G3BP2 Co-IP, TSC2 deacetylation and lysosomal fractionation in NSCLC\",\n      \"pmids\": [\"36823378\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab pathway with Co-IP-based complexes\", \"Direct ETV4 occupancy at HK1 not as deeply mapped as transcriptional output\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established ETV4 as a mediator of transcriptional plasticity and therapy resistance by showing it occupies IKZF1-bound enhancers to sustain MYC after IMiD-induced IKZF1 loss.\",\n      \"evidence\": \"ETV4 and IKZF1 ChIP-seq, CRISPR ETV4 deletion, viability assays in IMiD-resistant myeloma\",\n      \"pmids\": [\"37934799\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of ETV4 recruitment to vacated enhancers unclear\", \"Generality across other resistance settings untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the distinct ETV4 regulatory layers — autoinhibition relief, acetylation, redox dimerization, MED25 multivalency, and cofactor partnerships (HIF, ER, YAP, IKZF1) — are integrated to select context-specific target programs remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking PTM state to partner choice\", \"Endogenous ETV4 vs ETV1/ETV5 division of labor across tissues incompletely defined\", \"Structure of full-length ETV4 in cofactor complexes lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 9, 30, 42]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 25, 29, 30]},\n      {\"term_id\": \"GO:0003700\", \"supporting_discovery_ids\": [0, 34]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [36, 40, 46]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 29, 30]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 16, 31, 48]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 23, 34, 50, 51]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [13, 19, 24, 26, 28]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [1, 8, 34]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"MED25\", \"HIF1A\", \"YAP1\", \"Sp1\", \"COP1\", \"ESR1\", \"TEAD4\", \"IKZF1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}