{"gene":"ETV1","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":1995,"finding":"ETV1 (ER81) was identified as a fusion partner with EWS in the t(7;22)(p22;q12) translocation in Ewing's sarcoma; the EWS-ETV1 chimeric protein contains the ETS DNA-binding domain of ETV1, which retains sequence-specific DNA-binding activity.","method":"Molecular cloning, sequencing, DNA-binding assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct molecular characterization with DNA-binding assay; foundational paper replicated in multiple subsequent studies","pmids":["7700648"],"is_preprint":false},{"year":1995,"finding":"Human ETV1/ER81 protein localizes to the nucleus (detected by immunocytochemistry in COS-1 cells) and functions as a transcriptional activator at promoters containing ETS binding sites.","method":"Transient transfection reporter assay, immunocytochemistry","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment plus functional reporter assay in a single lab study","pmids":["7651741"],"is_preprint":false},{"year":1996,"finding":"ER81 (ETV1) is transcriptionally activated by the Ras/Raf/MEK/ERK signaling cascade; activated ERK-1 directly phosphorylates ER81, and the carboxy-terminal region of ER81 is also activated by an ERK-stimulated downstream kinase. Nuclear localization of ER81 is conferred by its DNA-binding domain.","method":"Kinase assay (ERK-1 phosphorylation of ER81 in vitro), dominant-negative Raf/ERK constructs, reporter assay, immunolocalization","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay plus genetic epistasis with dominant-negative constructs; foundational mechanistic paper replicated in subsequent studies","pmids":["8657129"],"is_preprint":false},{"year":2000,"finding":"ER81 (ETV1) co-immunoprecipitates with the transcriptional coactivators CBP and p300, and co-localizes with p300 in nuclear speckles; the ETS DNA-binding domain (aa 249–429) mediates binding to CBP/p300. Two regions within CBP (aa 451–721 and 1891–2175) bind ER81. An ER81-associated kinase phosphorylates ER81 on Ser191 and Ser216, and p300 overexpression enhances this kinase activity.","method":"Co-immunoprecipitation, confocal microscopy, in vitro binding, site-directed mutagenesis, reporter assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reciprocal Co-IP, colocalization, domain mapping, and mutagenesis in a single rigorous study","pmids":["10982847"],"is_preprint":false},{"year":2000,"finding":"Er81 (ETV1) is required in mice for the formation of direct connections between group Ia proprioceptive afferents and motor neurons in the spinal cord; Er81 mutant mice show failure of proprioceptive afferents to form a discrete termination zone in the ventral spinal cord, resulting in severe motor discoordination, despite normal motor neuron specification and muscle spindle induction.","method":"Er81 knockout mouse analysis, anatomical tracing, behavioral assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with specific cellular phenotype, replicated across labs","pmids":["10850491"],"is_preprint":false},{"year":2000,"finding":"EWS-ETV1 fusion protein suppresses transcription of the TGF-β type II receptor gene; stable expression in NIH-3T3 cells reduces TGF-β RII mRNA, protein, and TGF-β sensitivity, and co-transfection suppresses TGF-β RII promoter activity.","method":"Stable transfection, RT-PCR, Western blot, promoter reporter assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (RT-PCR, protein, reporter) in a single lab","pmids":["10749119"],"is_preprint":false},{"year":2001,"finding":"ER81 (ETV1) directly binds to and activates the MMP-1 promoter; HER2/Neu synergizes with ER81 to stimulate MMP-1 transcription via MAP kinase-mediated phosphorylation of ER81 at four N-terminal sites. Blocking phosphorylation at these sites decreases ER81 transcriptional activity.","method":"Promoter reporter assay, site-directed mutagenesis, ChIP-like binding assay, co-transfection","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding to promoter, mutagenesis of phosphorylation sites, and functional readout in a single rigorous study","pmids":["11593430"],"is_preprint":false},{"year":2001,"finding":"MK2 (MAPKAP kinase 2) phosphorylates ER81 in vitro at Ser191 and Ser216 within its central inhibitory domain, and overexpression of MK2 increases in vivo phosphorylation of ER81 and suppresses ER81-dependent transcription in a cell-type-specific manner.","method":"In vitro kinase assay, site-directed mutagenesis, reporter assay, overexpression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis plus functional reporter; single lab but multiple orthogonal methods","pmids":["11551945"],"is_preprint":false},{"year":2002,"finding":"RSK1 binds to ER81, phosphorylates it at Ser191 and Ser216 in vivo, and enhances ER81-dependent transcription downstream of the ERK-MAPK pathway. PKA also phosphorylates ER81 at Ser191/Ser216 and additionally at Ser334; phosphorylation of Ser334 reduces DNA-binding ability but paradoxically enhances transactivation potential. RSK1 also activates the ER81 cofactor CBP.","method":"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis, reporter assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — Co-IP, in vitro kinase assay, mutagenesis, and functional reporter in a single study","pmids":["12213813"],"is_preprint":false},{"year":2002,"finding":"ER81 activates the Her2/neu promoter through a single ETS binding site; this activation requires ER81 transactivation domains and is enhanced by MAPK stimulation, p300/CBP co-activators, and oncogenic HER2/Neu, forming a positive regulatory feedback loop.","method":"Promoter reporter assay, site-directed mutagenesis, co-transfection","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay plus mutagenesis plus co-activator co-transfection, single lab","pmids":["12112028"],"is_preprint":false},{"year":2003,"finding":"ER81 (ETV1) is acetylated by p300 at Lys33 and Lys116, and by P/CAF at Lys116, in vitro and in vivo. Acetylation enhances ER81 DNA-binding activity, transactivation potential, and in vivo protein half-life. HER2/Neu promotes p300-mediated acetylation of ER81 via the Ras/Raf/MAPK pathway. Acetylation-deficient ER81 mutants show reduced response to HER2/Neu.","method":"In vitro acetylation assay, immunoprecipitation, site-directed mutagenesis, reporter assay, pulse-chase (protein stability)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro and in vivo acetyltransferase assay with mutagenesis and functional validation; multiple orthogonal methods","pmids":["12917345"],"is_preprint":false},{"year":2003,"finding":"MSK1 directly phosphorylates ER81 at two serine residues and enhances ER81-dependent transcription, particularly via p38-MAPK pathway activation. MSK1 also interacts with CBP/p300 coactivators of ER81 and stimulates CBP transactivation domains, providing an indirect route to ER81 activation.","method":"In vitro kinase assay, co-immunoprecipitation, site-directed mutagenesis, reporter assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay, Co-IP, and mutagenesis with functional reporter in one study","pmids":["12569367"],"is_preprint":false},{"year":2003,"finding":"HER2/Neu collaborates with ER81 to activate Smad7 transcription; ER81 binds two ETS sites in the Smad7 promoter, and mutation of one critical site greatly reduces Smad7 induction. HER2/Neu signals to ER81 via ERK-MAPK. TAK1 activates ER81 via p38-MAPK to induce Smad7 promoter activity.","method":"Reporter assay, site-directed mutagenesis, co-transfection, Western blot","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter binding by mutagenesis, two signaling pathways tested orthogonally, single lab","pmids":["12947087"],"is_preprint":false},{"year":2003,"finding":"EWS-ER81 and EWS-Fli-1 fusion proteins activate the MMP-1 promoter; EWS-ER81 binds to c-Jun in vitro and in vivo, and their interaction is potentiated by p300. c-Jun and p300 cooperate with EWS-ER81 to upregulate MMP-1 transcription.","method":"Co-immunoprecipitation, reporter assay, in vitro binding","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and in vitro binding, with functional reporter; single lab","pmids":["14550555"],"is_preprint":false},{"year":2004,"finding":"ER81 (ETV1) activates the hTERT promoter through ER81 binding sites; mutating these sites or suppressing ERK-dependent phosphorylation of ER81 renders the hTERT promoter unresponsive to HER2/Neu. HER2/Neu, Ras, and Raf collaborate with ER81 to increase endogenous hTERT gene transcription and telomerase activity.","method":"Promoter reporter assay with site-directed mutagenesis, dominant-negative ER81 expression, endogenous gene expression analysis, telomerase activity assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — promoter mutagenesis, dominant-negative, and functional telomerase assay; multiple orthogonal methods","pmids":["14673140"],"is_preprint":false},{"year":2004,"finding":"ACTR (and related p160 steroid receptor coactivators SRC-1 and GRIP-1) interact with ER81 and augment ER81-mediated transcription. ACTR collaborates with p300 to stimulate ER81 function, and p300's acetyltransferase activity toward ER81 is required for this collaboration. HER2/Neu cooperates with ACTR and p300 to stimulate ER81-mediated transcription.","method":"Co-immunoprecipitation, reporter assay, acetyltransferase assay, co-transfection","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, functional reporter, and acetyltransferase assay; single lab","pmids":["14747462"],"is_preprint":false},{"year":2007,"finding":"ETV1 is a novel androgen receptor (AR)-regulated gene; the ETV1 promoter is induced by ligand-activated AR, which recruits AR to the ETV1 promoter in chromatin context. ETV1 in turn regulates endogenous MMP genes and is required for invasion of prostate cancer cells.","method":"Reporter assay, ChIP, siRNA knockdown, Matrigel invasion assay, Western blot","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP confirms AR recruitment, siRNA knockdown with specific invasion phenotype, multiple methods","pmids":["17505060"],"is_preprint":false},{"year":2008,"finding":"Full-length ETV1 and N-truncated dETV1 (from fusion transcripts) both induce migration and invasion of prostate epithelial cells, with upregulation of uPA/uPAR and MMPs. Only full-length ETV1 induces anchorage-independent growth and upregulates integrin β3. Full-length ETV1 is a strong transactivator; dETV1 is not.","method":"Stable transfection, migration/invasion assays, reporter assay, gene expression profiling","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — stable overexpression with multiple functional readouts; single lab","pmids":["18794142"],"is_preprint":false},{"year":2008,"finding":"ETV1 (ER81) directly binds to and activates the Rcl (nucleotide metabolism enzyme) promoter in vivo (ChIP confirmed); ETV1 and HER2/Neu cooperate to upregulate the endogenous Rcl gene. ETV1 downregulation suppresses proliferation of HER2/Neu-positive breast cancer cells in vitro and tumor formation in vivo.","method":"ChIP, reporter assay, siRNA/shRNA knockdown, in vitro proliferation assay, xenograft model","journal":"Journal of cellular biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP confirming direct promoter binding, loss-of-function with in vivo phenotype; multiple orthogonal methods","pmids":["18726892"],"is_preprint":false},{"year":2010,"finding":"ETV1 is a master regulator of interstitial cells of Cajal (ICC) lineage identity and is required for ICC development; ETV1 is universally highly expressed in GISTs and is required for growth of imatinib-sensitive and resistant GIST cell lines. Activated KIT signaling prolongs ETV1 protein stability (post-translational regulation). Transcriptome profiling and genome-wide ETV1 ChIP-seq show ETV1 acts mainly as an enhancer-binding master regulator of the ICC-GIST transcriptional network.","method":"shRNA knockdown, ChIP-seq, transcriptome profiling, ICC-lineage mouse genetics, protein stability assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP-seq, genetic loss-of-function, protein stability assay; multiple orthogonal methods, high-impact journal","pmids":["20927104"],"is_preprint":false},{"year":2010,"finding":"ETV1 overexpression combined with oncogenic NRAS(G12D) transforms primary melanocytes and promotes tumor formation in mice. ETV1 overexpression elevates MITF expression in immortalized melanocytes, and MITF is necessary for ETV1-dependent oncogenicity.","method":"Melanocyte transformation assay, mouse tumor model, siRNA knockdown, Western blot","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo transformation assay and genetic epistasis (MITF knockdown rescues ETV1 phenotype); single lab","pmids":["20160028"],"is_preprint":false},{"year":2011,"finding":"ETV1 directly binds to the POMC promoter and enhances POMC transcription; Etv1 and Tpit physically interact (Co-IP) and synergize to activate POMC transcription. The ETS-binding site in the POMC promoter is necessary for Etv1 activity in AtT-20 cells. siRNA-mediated knockdown of Etv1 reduces POMC expression.","method":"Co-immunoprecipitation, ChIP, reporter assay, siRNA knockdown, Etv1-lacZ knockin mice","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, and functional siRNA knockdown with specific phenotype; multiple orthogonal methods","pmids":["21622576"],"is_preprint":false},{"year":2011,"finding":"Etv1/Er81 activity-dependently upregulates maturation genes (NR2C, GABAARα6) in cerebellar granule cells; Etv1 is induced by sequential AMPA→NMDA→Nav1.2→Ca2+ channel signaling, then binds Etv1-interacting motifs in maturation gene promoters as shown by ChIP. In vivo knockdown of Etv1 prevents maturation gene upregulation.","method":"ChIP, luciferase reporter assay, siRNA knockdown (in vitro and in vivo electroporation), pharmacological inhibition","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP confirms direct promoter binding, in vivo knockdown with specific phenotype, pharmacological pathway dissection; multiple methods","pmids":["21746923"],"is_preprint":false},{"year":2012,"finding":"BDNF signals via TrkB-ERK cascade to phosphorylate Etv1/Er81, and phosphorylated Etv1 binds Ets motifs in the NR2C promoter to activate transcription. Phosphorylation at Ser94 and a cluster of Thr139/Thr143/Ser146 is indispensable for BDNF-mediated NR2C promoter activation.","method":"Site-directed mutagenesis, luciferase reporter assay, siRNA knockdown, pharmacological ERK inhibition","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of specific phosphorylation sites combined with functional reporter and siRNA; rigorous mechanistic study","pmids":["22586091"],"is_preprint":false},{"year":2013,"finding":"ETV1 and ERG control a common transcriptional network but largely in opposing fashion in prostate cancer: ERG negatively regulates androgen receptor (AR) transcriptional program while ETV1 cooperates with AR signaling. ETV1 expression promotes autonomous testosterone production. Only ETV1 (not ERG) supports development of invasive adenocarcinoma under full Pten loss in mice.","method":"Targeted knock-in mouse models (Tmprss2-ETV1, Tmprss2-ERG), genetic epistasis with Pten loss, transcriptome profiling, androgen pathway analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knock-in models with genetic epistasis, transcriptome profiling; multiple orthogonal methods","pmids":["23512661"],"is_preprint":false},{"year":2013,"finding":"All 14-3-3 proteins except 14-3-3σ bind ETV1 in a phosphorylation-dependent manner dictated by Ser216. Non-σ 14-3-3 proteins protect ETV1 from degradation, synergize with ETV1 to activate MMP-1 and MMP-7 transcription, and promote ETV1-dependent migration and invasion.","method":"Co-immunoprecipitation, site-directed mutagenesis (S216), reporter assay, shRNA knockdown, Western blot (protein stability)","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, mutagenesis, functional reporter, and protein stability assay; multiple methods","pmids":["23774214"],"is_preprint":false},{"year":2013,"finding":"Etv1 inactivation in mice reveals proprioceptor subclasses with differential Etv1-dependence for survival and differentiation, linked to levels of NT3 in muscle targets. Elevating muscle-derived NT3 can rescue loss of proprioceptors triggered by Etv1 inactivation, revealing a TrkC-activated Etv1-bypass pathway.","method":"Etv1 conditional knockout mice, NT3 overexpression rescue experiment, anatomical analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with specific cellular phenotype plus genetic rescue experiment","pmids":["23522042"],"is_preprint":false},{"year":2013,"finding":"ETV1 transcriptionally upregulates Snail expression to induce epithelial-to-mesenchymal transition in gastric cancer cells; ETV1 overexpression in normal gastric epithelial cells increases invasiveness, and ETV1 knockdown reduces aggressiveness of invasive gastric cancer cells.","method":"Overexpression, siRNA knockdown, reporter assay, invasion assay, EMT marker analysis","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay for Snail promoter plus loss-of-function with invasion phenotype; single lab","pmids":["24100634"],"is_preprint":false},{"year":2014,"finding":"The small molecule BRD32048 directly binds ETV1 protein, modulates ETV1-mediated transcriptional activity, inhibits invasion of ETV1-driven cancer cells, and inhibits p300-dependent acetylation of ETV1, thereby promoting ETV1 degradation.","method":"Small-molecule microarray screen, direct binding assay, reporter assay, invasion assay, Western blot (protein stability)","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding confirmed, multiple functional readouts; single lab","pmids":["24737027"],"is_preprint":false},{"year":2014,"finding":"ETV1 directly binds to and cooperates with EWSR1 to transactivate Fgf10 promoter in limb bud mesenchyme; both Etv1 and Ewsr1 bind the conserved AGAAAR cluster in the Fgf10 promoter in vivo and in vitro; Etv1 directly binds the AGAAAR sequence in vitro. Etv1 and Ewsr1 are each necessary for Fgf10 expression and limb bud elongation.","method":"ChIP, in vitro DNA-binding assay, reporter assay, siRNA/dominant-negative loss-of-function, chick/mouse limb bud experiments","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro DNA-binding plus ChIP in vivo plus loss-of-function with specific phenotype","pmids":["25109552"],"is_preprint":false},{"year":2015,"finding":"Crystal structures of the ETV1 ETS domain (alone and in complex with DNA) reveal that DNA backbone interactions account for most binding affinity. A coordinated network of water molecules mediates base selection upstream of the GGAA core. ETV1 crystallized as a disulfide-linked dimer; reduction of disulfide bonds (monomerization) increases DNA-binding affinity 40–200-fold, indicating a redox-dependent regulatory mechanism controlling ETV1 activity.","method":"X-ray crystallography, biochemical DNA-binding assay, redox manipulation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus biochemical validation of redox regulation; rigorous structural biology study","pmids":["25866208"],"is_preprint":false},{"year":2015,"finding":"MAP kinase activation downstream of KIT stabilizes ETV1 protein; ETV1 in turn positively regulates KIT expression, forming a positive feedback circuit. Combined KIT inhibition (imatinib) and MEK inhibition (MEK162) synergistically destabilize ETV1 and suppress GIST tumor growth, including complete regression in vivo. ETV1 is required for GIST initiation and proliferation in vivo, validated by Etv1 ablation in mouse Kit-activation models.","method":"Mouse genetics (Kit activation + Etv1 ablation), protein stability assay, combination drug treatment, in vitro and in vivo tumor growth assay","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse genetics, protein stability mechanism, and in vivo therapeutic validation with multiple methods","pmids":["25572173"],"is_preprint":false},{"year":2015,"finding":"PDGFRA signaling stabilizes ETV1 protein in GIST cells via ERK-dependent mechanisms; PDGFRA knockdown or inhibition reduces ETV1 protein and expression of KIT, disrupting a KIT-ERK-ETV1-KIT signaling loop. ETV1 knockdown reduces KIT expression and GIST proliferation.","method":"siRNA knockdown, pharmacological inhibition (crenolanib), Western blot (protein stability/phosphorylation), cell proliferation assay","journal":"Gastroenterology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown and pharmacological inhibition with mechanistic Western blot readouts; single lab","pmids":["25865047"],"is_preprint":false},{"year":2015,"finding":"DNA-binding autoinhibition of ETV1 is mediated by cooperative intramolecular interactions: a C-terminal inhibitory α-helix packs against the ETS domain and perturbs the DNA-recognition helix conformation, while the N-terminal inhibitory domain (NID) is intrinsically disordered but makes transient intramolecular contacts with the DNA-recognition helix via NMR. Acetylation of specific NID lysines activates DNA binding.","method":"X-ray crystallography, NMR spectroscopy, acetylation assay, DNA-binding assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus NMR with functional validation of acetylation-dependent activation; multiple rigorous structural/biochemical methods","pmids":["28161714"],"is_preprint":false},{"year":2016,"finding":"JMJD2A (KDM4A) histone demethylase binds ETV1 and cooperates with it to drive prostate cancer; ETV1 facilitates JMJD2A recruitment to the YAP1 promoter, leading to changes in histone lysine methylation and increased YAP1 expression. Combined JMJD2A+ETV1 overexpression in Pten-haplodeficient mice causes prostate carcinoma formation.","method":"Co-immunoprecipitation, ChIP (histone methylation), mouse transgenic model, shRNA knockdown, reporter assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, ChIP showing histone modifications, in vivo mouse model, and genetic rescue; multiple orthogonal methods","pmids":["26731476"],"is_preprint":false},{"year":2016,"finding":"ETV1 is a critical regulator of fast conduction physiology in mouse heart; Etv1 is highly expressed in pectinated atrial myocardium and ventricular conduction system (VCS). Etv1 deficiency causes marked cardiac conduction defects, developmental VCS abnormalities, and loss of normal sodium current heterogeneity. Etv1 regulates expression of Nkx2-5, Gja5, and Scn5a.","method":"Etv1 knockout mice, cardiac electrophysiology (ECG, patch clamp), histological analysis, gene expression profiling","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with multiple specific electrophysiological phenotypes and downstream target gene identification","pmids":["27775552"],"is_preprint":false},{"year":2016,"finding":"ER81 (ETV1) is functionally required in RET+ mechanosensory neurons for Pacinian corpuscle formation; RET signaling maintains Er81 expression; Er81 null neurons have deficient axon-Schwann cell interactions in corpuscles with reduced Nrg1 isoform expression not required for myelination, placing ER81 in a RET-ER81-NRG1 signaling pathway for Pacinian corpuscle development.","method":"Er81 knockout and Ret conditional knockout mice, genetic epistasis, Nrg1 isoform analysis, anatomical/histological analysis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic loss-of-function models with specific phenotypes establishing pathway order","pmids":["27707970"],"is_preprint":false},{"year":2016,"finding":"ETV1 activates Sparc and Has2 (hyaluronan synthase 2) as downstream target genes (Sparc confirmed by luciferase assay and in vivo co-localization); ETV1 drives desmoplastic stromal expansion and metastasis in pancreatic cancer, and disruption of Sparc abrogates this phenotype.","method":"Luciferase reporter assay, orthotopic xenograft, 3D organoid culture, Etv1 conditional knockout in PDAC mice, immunohistochemistry","journal":"Gastroenterology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay for target gene, genetic loss-of-function with in vivo phenotype; single lab","pmids":["27318148"],"is_preprint":false},{"year":2017,"finding":"Hyperglycemia increases ICCs via MAPK1/MAPK3-dependent stabilization of ETV1 protein, which then upregulates KIT expression, causing rapid gastric emptying. This was demonstrated in hyperglycemic mouse models and in isolated ICC lineage cells with pharmacological MAPK manipulation.","method":"Mouse models (Leprdb/db, KitK641E/+), ICC cell culture, pharmacological MAPK inhibition, siRNA knockdown, Western blot (ETV1 protein stability), flow cytometry","journal":"Gastroenterology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and RNAi manipulation with mechanistic protein stability readout; multiple methods in one lab","pmids":["28438610"],"is_preprint":false},{"year":2018,"finding":"ETV1 overexpression in mouse cardiomyocytes causes atrial dilatation, fibrosis, thrombosis, and arrhythmia. ETV1-deficient mice do not develop atrial remodeling after angiotensin II treatment. ETV1-regulated genes include Ryr2, Jph2, Gja5, Kcnh2, Kcnk3, and Tbx5, identified by chromatin accessibility (ATAC-seq) and active chromatin (H3K27ac ChIP-seq) in isolated atrial cardiomyocytes.","method":"Cardiac myocyte-specific ETV1 overexpression and knockout mouse models, ATAC-seq, ChIP-seq (H3K27ac), echocardiography, electrophysiology","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain- and loss-of-function genetics with specific cardiac phenotypes plus genome-wide chromatin profiling","pmids":["29930145"],"is_preprint":false},{"year":2018,"finding":"ETV1 promotes a His-Purkinje system (HPS) transcriptional program; cardiomyocyte-specific deletion of ETV1 decreases expression of Nkx2-5, Gja5, and Scn5a and causes HPS hypoplasia and ventricularization of sodium channel properties. Forced ETV1 expression in postnatal ventricular myocytes or human iPSC-derived cardiomyocytes promotes a HPS gene signature and increases inward sodium currents.","method":"Cardiomyocyte-specific knockout, viral ETV1 overexpression, human iPSC-cardiomyocyte model, electrophysiology (patch clamp), gene expression profiling","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain- and loss-of-function in multiple model systems including human iPSC-derived cells","pmids":["29967479"],"is_preprint":false},{"year":2019,"finding":"ETV1 mediates FGF signaling effects on cancer-associated fibroblast (CAF) gene expression; FGF and TGF-β signaling oppositely modulate CAF effector genes, with ETV1 mediating the FGF effects. Genetic abrogation of ETV1 abolishes FGF-mediated gene regulation and leads to induction of TGF-β-responsive genes.","method":"Genetic abrogation (siRNA/CRISPR), pharmacological pathway inhibition, gene expression analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function in primary human fibroblasts with specific pathway readout; single lab","pmids":["31461652"],"is_preprint":false},{"year":2019,"finding":"ETV1 forms complexes with SMAD4 (Co-IP). SMAD2, SMAD3, and SMAD4 overexpression impairs ETV1's ability to stimulate gene transcription. TGF-β1 inhibits ETV1-induced invasion. Conversely, ETV1 may enhance TGF-β signaling in PC3 cells. Sumoylation-deficient ETV1 shows enhanced interaction with HDAC1 but reduced interaction with SMAD4.","method":"Co-immunoprecipitation, reporter assay, invasion assay, Western blot","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP confirming complex formation, functional reporter and invasion assay; single lab","pmids":["31160676"],"is_preprint":false},{"year":2019,"finding":"ETV1 promotes HCC metastasis by transcriptionally upregulating PTK2 and c-MET (confirmed by luciferase reporter and ChIP). HGF upregulates ETV1 expression through c-MET-ERK1/2-ELK1 pathway, creating a positive feedback loop. Combined PTK2 and c-MET inhibition suppresses ETV1-mediated HCC metastasis.","method":"Luciferase reporter assay, ChIP, siRNA knockdown, transwell invasion assay, orthotopic metastatic mouse model","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assay for target genes, pathway epistasis, in vivo model; single lab","pmids":["36109787"],"is_preprint":false},{"year":2020,"finding":"ETV1 directly binds to JMJD1A (histone demethylase) and cooperates with it (but not a catalytically inactive mutant) to induce the MMP1 gene promoter, similar to ETV1-JMJD2A cooperation. ETV1 and JMJD1A co-regulate FOXQ1 and other ETV1 target genes; both bind the FOXQ1 promoter. FOXQ1 overexpression partially rescues growth inhibitory effects of ETV1 ablation.","method":"Co-immunoprecipitation, reporter assay, ChIP, RNA-seq, shRNA knockdown, catalytically inactive mutant","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, reporter assay with catalytic mutant control; single lab","pmids":["33174020"],"is_preprint":false},{"year":2020,"finding":"ETV1 expression is decreased in the left atrium during cardiac pressure overload (in human heart failure patients and mouse models), contributing to electrical and structural remodeling. ETV1 levels directly correlate with NRG1, ERBB4, SCN5A, and GJA5 expression. Cardiomyocyte-selective Etv1 knockout mice display atrial conduction disease and upregulation of profibrotic programming.","method":"Human LA biobank gene expression profiling, two murine pressure overload models (TAC, Ang II), Etv1 cardiomyocyte-selective knockout, RNA-seq","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 / Strong — human clinical data corroborated by multiple mouse models and genetic knockout with specific cardiac phenotype","pmids":["33225722"],"is_preprint":false},{"year":2021,"finding":"ETV1 can be sumoylated on four different lysine residues by SUMO1. Mutation of sumoylation sites modulates ETV1 transactivation at MMP1 promoter in a cell-type-specific manner. Sumoylation-deficient ETV1 shows enhanced interaction with HDAC1 but no change in complex formation with HDAC3 or JMJD2A, and is less able to bind SMAD4. In LNCaP prostate cancer cells, sumoylation-deficient ETV1 represses cell growth.","method":"SUMO modification assay, site-directed mutagenesis, reporter assay, co-immunoprecipitation, cell growth assay","journal":"International journal of clinical and experimental pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical sumoylation assay, Co-IP, functional reporter with mutagenesis; single lab","pmids":["34367411"],"is_preprint":false},{"year":2021,"finding":"ETV1 regulates cholinergic interneuron (CIN) physiological properties in the striatum; Er81-specific ablation in CINs alters their molecular, morphological, and electrophysiological features, amplifying delayed-rectifier and hyperpolarization-activated currents and disrupting tonic/phasic activity. Er81 loss in CINs impairs pause responses to sensorimotor inputs and disrupts habit formation.","method":"Cell-type-specific Cre knockout mice, patch-clamp electrophysiology, in vivo recording in awake mice, behavioral assay","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific genetic knockout with specific electrophysiological and behavioral phenotypes","pmids":["33849945"],"is_preprint":false},{"year":2022,"finding":"CIC and ERF co-bind the proximal regulatory element of the ETV1 gene and mutually repress ETV1 transcription; concurrent genomic loss of CIC and ERF at chromosome 19q13.2 drives fusion-independent ETV1 upregulation in prostate cancer. Targeting ETV1 in CIC/ERF-deficient prostate cancer limits tumor growth.","method":"ChIP, shRNA knockdown, CRISPR-deletion, genomic analysis, tumor growth assay","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP establishing co-binding at ETV1 regulatory element, genetic loss-of-function of CIC/ERF with specific ETV1 upregulation and tumor growth readout","pmids":["36383412"],"is_preprint":false},{"year":2022,"finding":"Etv1 promotes Schwann cell proliferation, migration, and differentiation, and is required for remyelination in vivo. Etv1 binds to the promoters of myelination-related genes MAG and Runx2 (confirmed by ChIP-qPCR and luciferase assay) to initiate their transcription. Knockdown of Etv1 in crushed sciatic nerve dramatically abrogates SC remyelination.","method":"In vivo sciatic nerve crush model, siRNA knockdown, ChIP-qPCR, luciferase reporter assay, transmission electron microscopy, proliferation/migration assays","journal":"Annals of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assay plus in vivo loss-of-function with histological phenotype; single lab","pmids":["36110998"],"is_preprint":false},{"year":2014,"finding":"Plakophilin-3 (Pkp3) associates with ETV1 transcription factor and positively modulates ETV1-dependent transcriptional activity; demonstrated by co-immunoprecipitation in Xenopus and mammalian cells.","method":"Co-immunoprecipitation, reporter assay, Xenopus embryo experiments","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP and reporter assay, single lab, no deep mechanistic characterization","pmids":["24475179"],"is_preprint":false},{"year":2008,"finding":"Pax6 directly activates the Er81 promoter through a conserved upstream DNA sequence containing Pax6 binding sites; one specific Pax6 binding site is necessary and sufficient for full Er81 promoter activation. Er81-positive layer 5 neurons are absent in the rostrolateral cortex of Pax6-null mice.","method":"Reporter assay, site-directed mutagenesis of Pax6 binding sites, Pax6 knockout mouse analysis","journal":"BMC developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with mutagenesis plus genetic loss-of-function validation; single lab","pmids":["18307776"],"is_preprint":false},{"year":2008,"finding":"ER81 and Sox-9 form a complex on the VE-cadherin promoter and are required for retinoic acid-mediated transcriptional regulation of VE-cadherin in breast cancer cells.","method":"Co-immunoprecipitation, ChIP, reporter assay, siRNA knockdown","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and Co-IP with functional reporter; single lab","pmids":["18628953"],"is_preprint":false}],"current_model":"ETV1 (ER81) is an ETS-family transcription factor that binds DNA through its ETS domain (subject to redox-regulated disulfide dimerization and intramolecular autoinhibition relieved by acetylation), is activated by multi-site phosphorylation from ERK, RSK1, MSK1, PKA, and MK2 downstream of Ras/MAPK signaling, is acetylated by p300 (K33, K116) and P/CAF (K116) to increase DNA binding and stability, is sumoylated on four lysines to modulate cofactor recruitment, and interacts with CBP/p300, p160 coactivators, 14-3-3 proteins, JMJD2A/JMJD1A histone demethylases, SMAD4, Tpit, Sox-9, and Pkp3 to regulate transcription of target genes including MMP-1, hTERT, Smad7, Her2/neu, KIT, Nkx2-5, Gja5, Scn5a, YAP1, FOXQ1, Rcl, uPA, Sparc, PTK2, and c-MET; in vivo, ETV1 is essential for sensorimotor circuit formation, ICC lineage identity and GIST pathogenesis (where KIT/MAPK signaling prolongs ETV1 protein stability), cardiac fast-conduction programming, Pacinian corpuscle development, cerebellar granule cell maturation, and cholinergic interneuron function, while CIC and ERF act as direct transcriptional repressors of ETV1 in prostate tissue."},"narrative":{"mechanistic_narrative":"ETV1 (ER81) is a sequence-specific ETS-family transcription factor that binds GGAA-core DNA elements through its C-terminal ETS domain to activate transcription, functioning across developmental programming and oncogenic gene networks [PMID:7651741, PMID:25866208]. Its DNA-binding activity is gated at multiple levels: redox-dependent disulfide dimerization (monomerization raises affinity 40–200-fold) and an intramolecular autoinhibition in which a C-terminal inhibitory helix and an intrinsically disordered N-terminal inhibitory domain perturb the DNA-recognition helix, an autoinhibition relieved by acetylation of N-terminal lysines [PMID:25866208, PMID:28161714]. ETV1 is a principal nuclear effector of Ras/MAPK signaling, directly phosphorylated by ERK and by the downstream kinases RSK1, MSK1, MK2 and PKA at serine residues (notably Ser191/Ser216) that tune its transactivation and DNA binding [PMID:8657129, PMID:11551945, PMID:12213813, PMID:12569367]. It is acetylated by p300/P/CAF at Lys33 and Lys116 to enhance DNA binding, transactivation, and protein half-life, and engages the coactivators CBP/p300 and p160 family members through its ETS domain [PMID:10982847, PMID:12917345, PMID:14747462]; phospho-dependent binding of 14-3-3 proteins (via Ser216) protects ETV1 from degradation and promotes invasion [PMID:23774214]. Through these inputs ETV1 directly binds and activates target promoters including MMP-1, hTERT, Her2/neu, Smad7, and Rcl, frequently in HER2/Neu-driven positive feedback loops [PMID:11593430, PMID:14673140, PMID:12112028, PMID:12947087, PMID:18726892]. In oncogenesis ETV1 acts as an enhancer-binding master regulator: it specifies interstitial cell of Cajal (ICC) lineage identity and drives GIST, where KIT/PDGFRA-MAPK signaling stabilizes ETV1 protein while ETV1 upregulates KIT in a self-reinforcing circuit [PMID:20927104, PMID:25572173, PMID:25865047]; it cooperates with the histone demethylases JMJD2A and JMJD1A to remodel chromatin at YAP1, FOXQ1 and MMP1 in prostate cancer [PMID:26731476, PMID:33174020]; and it cooperates with androgen-receptor signaling, while CIC and ERF act as direct transcriptional repressors of the ETV1 gene [PMID:17505060, PMID:23512661, PMID:36383412]. In vivo, ETV1 is essential for sensorimotor circuit assembly and proprioceptor differentiation, Pacinian corpuscle formation, cerebellar granule cell and striatal cholinergic interneuron maturation, Schwann-cell remyelination, and cardiac fast-conduction programming, where it regulates Nkx2-5, Gja5, and Scn5a [PMID:10850491, PMID:23522042, PMID:27707970, PMID:21746923, PMID:33849945, PMID:36110998, PMID:27775552, PMID:29967479].","teleology":[{"year":1995,"claim":"Established ETV1 as a sequence-specific DNA-binding ETS transcription factor and tied it to oncogenic rearrangement, defining its molecular identity.","evidence":"Molecular cloning and DNA-binding assay of the EWS-ETV1 fusion from Ewing's sarcoma; reporter and immunocytochemistry showing nuclear transcriptional activator function","pmids":["7700648","7651741"],"confidence":"High","gaps":["Endogenous target genes not yet identified","Regulatory inputs controlling activity unknown"]},{"year":1996,"claim":"Placed ETV1 downstream of Ras/Raf/MEK/ERK signaling, identifying it as a phosphorylation-controlled effector of the MAPK cascade.","evidence":"In vitro ERK-1 kinase assay, dominant-negative Raf/ERK epistasis, reporter and immunolocalization","pmids":["8657129"],"confidence":"High","gaps":["Specific phospho-acceptor sites not mapped","Identity of the C-terminal ERK-stimulated kinase undefined"]},{"year":2000,"claim":"Demonstrated that ETV1 recruits the CBP/p300 coactivators through its ETS domain, linking its transactivation to chromatin-modifying machinery, and showed it is required in vivo for proprioceptive afferent-motor neuron connectivity.","evidence":"Reciprocal Co-IP, confocal colocalization, domain mapping; Er81 knockout mouse anatomical tracing and behavior","pmids":["10982847","10850491"],"confidence":"High","gaps":["Direct neuronal target genes not identified","Coactivator recruitment mechanism on native promoters not defined"]},{"year":2001,"claim":"Identified direct ETV1 target promoters (MMP-1, Her2/neu) and resolved a multi-kinase phosphorylation code (ERK-driven N-terminal sites; MK2 at Ser191/Ser216) that can either enhance or suppress activity.","evidence":"Promoter reporter assays, site-directed mutagenesis of phospho-sites, in vitro kinase assays, co-transfection with HER2/Neu","pmids":["11593430","11551945","12112028"],"confidence":"High","gaps":["Cell-type determinants of activating vs inhibitory phosphorylation unclear","In vivo relevance of individual sites untested"]},{"year":2002,"claim":"Expanded the kinase repertoire (RSK1, PKA) acting on ETV1 and showed phosphorylation at distinct sites can uncouple DNA binding from transactivation.","evidence":"Co-IP, in vitro kinase assays, mutagenesis of Ser191/Ser216/Ser334, reporter assays","pmids":["12213813"],"confidence":"High","gaps":["Structural basis for Ser334-dependent DNA-binding loss unknown","Combinatorial effects of multiple kinases not dissected"]},{"year":2003,"claim":"Defined acetylation by p300/P/CAF at Lys33/Lys116 as a switch enhancing ETV1 DNA binding, transactivation, and protein stability, and added MSK1/p38 as another activating input.","evidence":"In vitro/in vivo acetylation assays, mutagenesis, pulse-chase stability assays, kinase assays, reporter assays","pmids":["12917345","12569367","12947087","14550555"],"confidence":"High","gaps":["Deacetylases reversing these marks not identified","Interplay between phosphorylation and acetylation timing unresolved"]},{"year":2004,"claim":"Linked ETV1 to telomerase activation (hTERT) and confirmed p160 coactivators (ACTR/SRC-1/GRIP-1) cooperate with p300 acetyltransferase activity to amplify ETV1 output in HER2/Neu-driven cancer.","evidence":"Promoter mutagenesis, dominant-negative ETV1, telomerase activity assay, Co-IP, acetyltransferase assay","pmids":["14673140","14747462"],"confidence":"High","gaps":["Whether ETV1 controls hTERT in physiological settings untested","Coactivator complex stoichiometry undefined"]},{"year":2008,"claim":"Connected ETV1 to androgen-receptor signaling and prostate cancer invasion, and identified Rcl as a direct ChIP-confirmed target supporting tumor growth; also placed ETV1 in Pax6- and Sox-9-dependent transcriptional contexts.","evidence":"ChIP, siRNA knockdown, invasion and xenograft assays; Pax6 promoter mutagenesis and knockout mice; ER81-Sox9 Co-IP/ChIP","pmids":["17505060","18794142","18726892","18307776","18628953"],"confidence":"High","gaps":["Genome-wide ETV1 occupancy not yet mapped","Distinction between truncated and full-length ETV1 mechanisms incomplete"]},{"year":2010,"claim":"Established ETV1 as a genome-wide enhancer-binding master regulator of the ICC lineage and GIST, with KIT-MAPK signaling stabilizing ETV1 protein, and extended its oncogenic reach to melanoma via MITF.","evidence":"Genome-wide ChIP-seq, transcriptome profiling, shRNA knockdown, ICC-lineage mouse genetics, protein stability assays; melanocyte transformation and MITF epistasis","pmids":["20927104","20160028"],"confidence":"High","gaps":["Mechanism of MAPK-dependent protein stabilization not molecularly defined","Enhancer co-factors driving ICC identity incompletely cataloged"]},{"year":2013,"claim":"Defined opposing roles of ETV1 and ERG in the prostate AR program, established 14-3-3 binding (via Ser216) as a stability and invasion-promoting mechanism, and refined Etv1 dependence of proprioceptor subclasses via muscle NT3.","evidence":"Knock-in mouse models with Pten epistasis, transcriptome profiling; Co-IP/mutagenesis/stability assays; conditional knockout with NT3 rescue; Snail/EMT reporter studies","pmids":["23512661","23774214","23522042","24100634"],"confidence":"High","gaps":["Determinants of ETV1 vs ERG target selectivity unresolved","TrkC-Etv1 bypass pathway molecular components incomplete"]},{"year":2015,"claim":"Provided structural mechanism for ETV1 DNA recognition and autoregulation (redox dimerization and intramolecular autoinhibition relieved by acetylation), and validated the KIT/PDGFRA-ERK-ETV1 protein-stability feedback circuit as a GIST therapeutic vulnerability.","evidence":"X-ray crystallography, NMR, redox/DNA-binding assays; mouse Kit-activation + Etv1 ablation genetics, combination KIT/MEK inhibition with tumor regression, PDGFRA knockdown","pmids":["25866208","28161714","25572173","25865047"],"confidence":"High","gaps":["In vivo relevance of redox-dependent dimerization unconfirmed","E3 ligase mediating ETV1 degradation not identified"]},{"year":2016,"claim":"Identified histone-demethylase partnership (JMJD2A) driving prostate carcinoma via chromatin remodeling at YAP1, and established ETV1 as a regulator of cardiac fast-conduction and Pacinian corpuscle programs through specific downstream genes.","evidence":"Co-IP, histone-methylation ChIP, Pten-haplodeficient mouse model; Etv1 knockout cardiac electrophysiology with Nkx2-5/Gja5/Scn5a profiling; Ret/Er81 epistasis and Nrg1 analysis","pmids":["26731476","27775552","27707970","27318148"],"confidence":"High","gaps":["Direct vs indirect regulation of cardiac conduction genes not fully separated","How ETV1 directs JMJD2A locus specificity unknown"]},{"year":2018,"claim":"Defined ETV1 dose-dependent control of cardiac chromatin and His-Purkinje/atrial gene programs using genome-wide accessibility and active-chromatin profiling plus reciprocal gain/loss-of-function including human iPSC-cardiomyocytes.","evidence":"Cardiomyocyte-specific overexpression/knockout mice, ATAC-seq, H3K27ac ChIP-seq, electrophysiology, iPSC-CM models","pmids":["29930145","29967479"],"confidence":"High","gaps":["Upstream regulators setting cardiac ETV1 levels unclear","Direct enhancer targets within HPS program not all validated"]},{"year":2019,"claim":"Positioned ETV1 as an FGF-signaling effector antagonizing TGF-β programs, characterized SMAD4 complex formation modulating its activity, and identified PTK2/c-MET as direct metastatic targets in HCC.","evidence":"siRNA/CRISPR abrogation in fibroblasts; ETV1-SMAD4 Co-IP and reporter/invasion assays; ChIP/reporter for PTK2 and c-MET with orthotopic metastasis model","pmids":["31461652","31160676","36109787"],"confidence":"Medium","gaps":["Mechanism of ETV1-SMAD4 functional antagonism vs cooperation context-dependent and unresolved","Single-lab Co-IP evidence for SMAD interactions"]},{"year":2021,"claim":"Added sumoylation on four lysines as a cofactor-recruitment switch (modulating HDAC1/SMAD4 binding) and established ETV1 control of striatal cholinergic interneuron physiology and habit formation.","evidence":"SUMO modification assay, mutagenesis, Co-IP, reporter/growth assays; cell-type-specific knockout with patch-clamp, in vivo recording and behavior","pmids":["34367411","33849945"],"confidence":"High","gaps":["SUMO E3 ligases for ETV1 not identified","Functional integration of sumoylation with phosphorylation/acetylation undefined"]},{"year":2022,"claim":"Identified CIC and ERF as direct co-repressors of the ETV1 gene whose genomic loss drives fusion-independent ETV1 upregulation, and established ETV1 as required for Schwann-cell remyelination via MAG and Runx2.","evidence":"ChIP co-binding at ETV1 regulatory element, shRNA/CRISPR loss-of-function, tumor growth assays; sciatic nerve crush model with ChIP-qPCR/reporter and EM","pmids":["36383412","36110998"],"confidence":"High","gaps":["Whether CIC/ERF repression operates in non-prostate tissues untested","Schwann-cell findings from a single lab"]},{"year":null,"claim":"How the layered post-translational code (phosphorylation, acetylation, sumoylation, redox dimerization) is integrated combinatorially to dictate ETV1 locus selection and tissue-specific enhancer occupancy remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking modification state to genome-wide binding","E3 ligase and deacetylase/desumoylase machinery for ETV1 unidentified","Mechanism of tissue-specific cofactor choice unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,6,30,33]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,2,6,19,35]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2,3]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,6,14,19]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,8,31,32]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[19,24,31,48]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,26,35,36,40]}],"complexes":[],"partners":["CREBBP","EP300","RPS6KA1","YWHAZ","KDM4A","KDM3A","SMAD4","SOX9"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P50549","full_name":"ETS translocation variant 1","aliases":["Ets-related protein 81"],"length_aa":477,"mass_kda":55.1,"function":"Transcriptional activator that binds to DNA sequences containing the consensus pentanucleotide 5'-CGGA[AT]-3' (PubMed:7651741). Required for olfactory dopaminergic neuron differentiation; may directly activate expression of tyrosine hydroxylase (TH) (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P50549/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ETV1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ETV1","total_profiled":1310},"omim":[{"mim_id":"616440","title":"SOLUTE CARRIER FAMILY 32 (GABA VESICULAR TRANSPORTER), MEMBER 1; SLC32A1","url":"https://www.omim.org/entry/616440"},{"mim_id":"612219","title":"EWING SARCOMA; ES","url":"https://www.omim.org/entry/612219"},{"mim_id":"612082","title":"CAPICUA TRANSCRIPTIONAL REPRESSOR; CIC","url":"https://www.omim.org/entry/612082"},{"mim_id":"609358","title":"ETS VARIANT TRANSCRIPTION FACTOR 2; ETV2","url":"https://www.omim.org/entry/609358"},{"mim_id":"608067","title":"RING FINGER AND WD REPEAT DOMAINS-CONTAINING PROTEIN 2; RFWD2","url":"https://www.omim.org/entry/608067"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":124.0},{"tissue":"salivary gland","ntpm":85.2}],"url":"https://www.proteinatlas.org/search/ETV1"},"hgnc":{"alias_symbol":["ER81"],"prev_symbol":[]},"alphafold":{"accession":"P50549","domains":[{"cath_id":"1.10.10.10","chopping":"338-426","consensus_level":"high","plddt":95.3829,"start":338,"end":426}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P50549","model_url":"https://alphafold.ebi.ac.uk/files/AF-P50549-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P50549-F1-predicted_aligned_error_v6.png","plddt_mean":58.47},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ETV1","jax_strain_url":"https://www.jax.org/strain/search?query=ETV1"},"sequence":{"accession":"P50549","fasta_url":"https://rest.uniprot.org/uniprotkb/P50549.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P50549/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P50549"}},"corpus_meta":[{"pmid":"7700648","id":"PMC_7700648","title":"A variant Ewing's sarcoma translocation (7;22) 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biology","url":"https://pubmed.ncbi.nlm.nih.gov/12917345","citation_count":92,"is_preprint":false},{"pmid":"16289830","id":"PMC_16289830","title":"Er81 is expressed in a subpopulation of layer 5 neurons in rodent and primate neocortices.","date":"2005","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/16289830","citation_count":92,"is_preprint":false},{"pmid":"26731476","id":"PMC_26731476","title":"Histone demethylase JMJD2A drives prostate tumorigenesis through transcription factor ETV1.","date":"2016","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/26731476","citation_count":91,"is_preprint":false},{"pmid":"12569367","id":"PMC_12569367","title":"Regulation of the ER81 transcription factor and its coactivators by mitogen- and stress-activated protein kinase 1 (MSK1).","date":"2003","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/12569367","citation_count":90,"is_preprint":false},{"pmid":"20160028","id":"PMC_20160028","title":"An oncogenic role for ETV1 in melanoma.","date":"2010","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/20160028","citation_count":90,"is_preprint":false},{"pmid":"23522042","id":"PMC_23522042","title":"Etv1 inactivation reveals proprioceptor subclasses that reflect the level of NT3 expression in muscle targets.","date":"2013","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/23522042","citation_count":89,"is_preprint":false},{"pmid":"12213813","id":"PMC_12213813","title":"Regulation of the ETS transcription factor ER81 by the 90-kDa ribosomal S6 kinase 1 and protein kinase A.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12213813","citation_count":85,"is_preprint":false},{"pmid":"21559405","id":"PMC_21559405","title":"YK-4-279 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\"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct molecular characterization with DNA-binding assay; foundational paper replicated in multiple subsequent studies\",\n      \"pmids\": [\"7700648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Human ETV1/ER81 protein localizes to the nucleus (detected by immunocytochemistry in COS-1 cells) and functions as a transcriptional activator at promoters containing ETS binding sites.\",\n      \"method\": \"Transient transfection reporter assay, immunocytochemistry\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment plus functional reporter assay in a single lab study\",\n      \"pmids\": [\"7651741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"ER81 (ETV1) is transcriptionally activated by the Ras/Raf/MEK/ERK signaling cascade; activated ERK-1 directly phosphorylates ER81, and the carboxy-terminal region of ER81 is also activated by an ERK-stimulated downstream kinase. Nuclear localization of ER81 is conferred by its DNA-binding domain.\",\n      \"method\": \"Kinase assay (ERK-1 phosphorylation of ER81 in vitro), dominant-negative Raf/ERK constructs, reporter assay, immunolocalization\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay plus genetic epistasis with dominant-negative constructs; foundational mechanistic paper replicated in subsequent studies\",\n      \"pmids\": [\"8657129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"ER81 (ETV1) co-immunoprecipitates with the transcriptional coactivators CBP and p300, and co-localizes with p300 in nuclear speckles; the ETS DNA-binding domain (aa 249–429) mediates binding to CBP/p300. Two regions within CBP (aa 451–721 and 1891–2175) bind ER81. An ER81-associated kinase phosphorylates ER81 on Ser191 and Ser216, and p300 overexpression enhances this kinase activity.\",\n      \"method\": \"Co-immunoprecipitation, confocal microscopy, in vitro binding, site-directed mutagenesis, reporter assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reciprocal Co-IP, colocalization, domain mapping, and mutagenesis in a single rigorous study\",\n      \"pmids\": [\"10982847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Er81 (ETV1) is required in mice for the formation of direct connections between group Ia proprioceptive afferents and motor neurons in the spinal cord; Er81 mutant mice show failure of proprioceptive afferents to form a discrete termination zone in the ventral spinal cord, resulting in severe motor discoordination, despite normal motor neuron specification and muscle spindle induction.\",\n      \"method\": \"Er81 knockout mouse analysis, anatomical tracing, behavioral assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with specific cellular phenotype, replicated across labs\",\n      \"pmids\": [\"10850491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"EWS-ETV1 fusion protein suppresses transcription of the TGF-β type II receptor gene; stable expression in NIH-3T3 cells reduces TGF-β RII mRNA, protein, and TGF-β sensitivity, and co-transfection suppresses TGF-β RII promoter activity.\",\n      \"method\": \"Stable transfection, RT-PCR, Western blot, promoter reporter assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (RT-PCR, protein, reporter) in a single lab\",\n      \"pmids\": [\"10749119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ER81 (ETV1) directly binds to and activates the MMP-1 promoter; HER2/Neu synergizes with ER81 to stimulate MMP-1 transcription via MAP kinase-mediated phosphorylation of ER81 at four N-terminal sites. Blocking phosphorylation at these sites decreases ER81 transcriptional activity.\",\n      \"method\": \"Promoter reporter assay, site-directed mutagenesis, ChIP-like binding assay, co-transfection\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding to promoter, mutagenesis of phosphorylation sites, and functional readout in a single rigorous study\",\n      \"pmids\": [\"11593430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"MK2 (MAPKAP kinase 2) phosphorylates ER81 in vitro at Ser191 and Ser216 within its central inhibitory domain, and overexpression of MK2 increases in vivo phosphorylation of ER81 and suppresses ER81-dependent transcription in a cell-type-specific manner.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis, reporter assay, overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis plus functional reporter; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"11551945\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RSK1 binds to ER81, phosphorylates it at Ser191 and Ser216 in vivo, and enhances ER81-dependent transcription downstream of the ERK-MAPK pathway. PKA also phosphorylates ER81 at Ser191/Ser216 and additionally at Ser334; phosphorylation of Ser334 reduces DNA-binding ability but paradoxically enhances transactivation potential. RSK1 also activates the ER81 cofactor CBP.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis, reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — Co-IP, in vitro kinase assay, mutagenesis, and functional reporter in a single study\",\n      \"pmids\": [\"12213813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ER81 activates the Her2/neu promoter through a single ETS binding site; this activation requires ER81 transactivation domains and is enhanced by MAPK stimulation, p300/CBP co-activators, and oncogenic HER2/Neu, forming a positive regulatory feedback loop.\",\n      \"method\": \"Promoter reporter assay, site-directed mutagenesis, co-transfection\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay plus mutagenesis plus co-activator co-transfection, single lab\",\n      \"pmids\": [\"12112028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ER81 (ETV1) is acetylated by p300 at Lys33 and Lys116, and by P/CAF at Lys116, in vitro and in vivo. Acetylation enhances ER81 DNA-binding activity, transactivation potential, and in vivo protein half-life. HER2/Neu promotes p300-mediated acetylation of ER81 via the Ras/Raf/MAPK pathway. Acetylation-deficient ER81 mutants show reduced response to HER2/Neu.\",\n      \"method\": \"In vitro acetylation assay, immunoprecipitation, site-directed mutagenesis, reporter assay, pulse-chase (protein stability)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro and in vivo acetyltransferase assay with mutagenesis and functional validation; multiple orthogonal methods\",\n      \"pmids\": [\"12917345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"MSK1 directly phosphorylates ER81 at two serine residues and enhances ER81-dependent transcription, particularly via p38-MAPK pathway activation. MSK1 also interacts with CBP/p300 coactivators of ER81 and stimulates CBP transactivation domains, providing an indirect route to ER81 activation.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, site-directed mutagenesis, reporter assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay, Co-IP, and mutagenesis with functional reporter in one study\",\n      \"pmids\": [\"12569367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"HER2/Neu collaborates with ER81 to activate Smad7 transcription; ER81 binds two ETS sites in the Smad7 promoter, and mutation of one critical site greatly reduces Smad7 induction. HER2/Neu signals to ER81 via ERK-MAPK. TAK1 activates ER81 via p38-MAPK to induce Smad7 promoter activity.\",\n      \"method\": \"Reporter assay, site-directed mutagenesis, co-transfection, Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter binding by mutagenesis, two signaling pathways tested orthogonally, single lab\",\n      \"pmids\": [\"12947087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"EWS-ER81 and EWS-Fli-1 fusion proteins activate the MMP-1 promoter; EWS-ER81 binds to c-Jun in vitro and in vivo, and their interaction is potentiated by p300. c-Jun and p300 cooperate with EWS-ER81 to upregulate MMP-1 transcription.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay, in vitro binding\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and in vitro binding, with functional reporter; single lab\",\n      \"pmids\": [\"14550555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ER81 (ETV1) activates the hTERT promoter through ER81 binding sites; mutating these sites or suppressing ERK-dependent phosphorylation of ER81 renders the hTERT promoter unresponsive to HER2/Neu. HER2/Neu, Ras, and Raf collaborate with ER81 to increase endogenous hTERT gene transcription and telomerase activity.\",\n      \"method\": \"Promoter reporter assay with site-directed mutagenesis, dominant-negative ER81 expression, endogenous gene expression analysis, telomerase activity assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — promoter mutagenesis, dominant-negative, and functional telomerase assay; multiple orthogonal methods\",\n      \"pmids\": [\"14673140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ACTR (and related p160 steroid receptor coactivators SRC-1 and GRIP-1) interact with ER81 and augment ER81-mediated transcription. ACTR collaborates with p300 to stimulate ER81 function, and p300's acetyltransferase activity toward ER81 is required for this collaboration. HER2/Neu cooperates with ACTR and p300 to stimulate ER81-mediated transcription.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay, acetyltransferase assay, co-transfection\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, functional reporter, and acetyltransferase assay; single lab\",\n      \"pmids\": [\"14747462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ETV1 is a novel androgen receptor (AR)-regulated gene; the ETV1 promoter is induced by ligand-activated AR, which recruits AR to the ETV1 promoter in chromatin context. ETV1 in turn regulates endogenous MMP genes and is required for invasion of prostate cancer cells.\",\n      \"method\": \"Reporter assay, ChIP, siRNA knockdown, Matrigel invasion assay, Western blot\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms AR recruitment, siRNA knockdown with specific invasion phenotype, multiple methods\",\n      \"pmids\": [\"17505060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Full-length ETV1 and N-truncated dETV1 (from fusion transcripts) both induce migration and invasion of prostate epithelial cells, with upregulation of uPA/uPAR and MMPs. Only full-length ETV1 induces anchorage-independent growth and upregulates integrin β3. Full-length ETV1 is a strong transactivator; dETV1 is not.\",\n      \"method\": \"Stable transfection, migration/invasion assays, reporter assay, gene expression profiling\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — stable overexpression with multiple functional readouts; single lab\",\n      \"pmids\": [\"18794142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ETV1 (ER81) directly binds to and activates the Rcl (nucleotide metabolism enzyme) promoter in vivo (ChIP confirmed); ETV1 and HER2/Neu cooperate to upregulate the endogenous Rcl gene. ETV1 downregulation suppresses proliferation of HER2/Neu-positive breast cancer cells in vitro and tumor formation in vivo.\",\n      \"method\": \"ChIP, reporter assay, siRNA/shRNA knockdown, in vitro proliferation assay, xenograft model\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP confirming direct promoter binding, loss-of-function with in vivo phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"18726892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ETV1 is a master regulator of interstitial cells of Cajal (ICC) lineage identity and is required for ICC development; ETV1 is universally highly expressed in GISTs and is required for growth of imatinib-sensitive and resistant GIST cell lines. Activated KIT signaling prolongs ETV1 protein stability (post-translational regulation). Transcriptome profiling and genome-wide ETV1 ChIP-seq show ETV1 acts mainly as an enhancer-binding master regulator of the ICC-GIST transcriptional network.\",\n      \"method\": \"shRNA knockdown, ChIP-seq, transcriptome profiling, ICC-lineage mouse genetics, protein stability assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP-seq, genetic loss-of-function, protein stability assay; multiple orthogonal methods, high-impact journal\",\n      \"pmids\": [\"20927104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ETV1 overexpression combined with oncogenic NRAS(G12D) transforms primary melanocytes and promotes tumor formation in mice. ETV1 overexpression elevates MITF expression in immortalized melanocytes, and MITF is necessary for ETV1-dependent oncogenicity.\",\n      \"method\": \"Melanocyte transformation assay, mouse tumor model, siRNA knockdown, Western blot\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transformation assay and genetic epistasis (MITF knockdown rescues ETV1 phenotype); single lab\",\n      \"pmids\": [\"20160028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ETV1 directly binds to the POMC promoter and enhances POMC transcription; Etv1 and Tpit physically interact (Co-IP) and synergize to activate POMC transcription. The ETS-binding site in the POMC promoter is necessary for Etv1 activity in AtT-20 cells. siRNA-mediated knockdown of Etv1 reduces POMC expression.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, reporter assay, siRNA knockdown, Etv1-lacZ knockin mice\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, and functional siRNA knockdown with specific phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"21622576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Etv1/Er81 activity-dependently upregulates maturation genes (NR2C, GABAARα6) in cerebellar granule cells; Etv1 is induced by sequential AMPA→NMDA→Nav1.2→Ca2+ channel signaling, then binds Etv1-interacting motifs in maturation gene promoters as shown by ChIP. In vivo knockdown of Etv1 prevents maturation gene upregulation.\",\n      \"method\": \"ChIP, luciferase reporter assay, siRNA knockdown (in vitro and in vivo electroporation), pharmacological inhibition\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP confirms direct promoter binding, in vivo knockdown with specific phenotype, pharmacological pathway dissection; multiple methods\",\n      \"pmids\": [\"21746923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"BDNF signals via TrkB-ERK cascade to phosphorylate Etv1/Er81, and phosphorylated Etv1 binds Ets motifs in the NR2C promoter to activate transcription. Phosphorylation at Ser94 and a cluster of Thr139/Thr143/Ser146 is indispensable for BDNF-mediated NR2C promoter activation.\",\n      \"method\": \"Site-directed mutagenesis, luciferase reporter assay, siRNA knockdown, pharmacological ERK inhibition\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of specific phosphorylation sites combined with functional reporter and siRNA; rigorous mechanistic study\",\n      \"pmids\": [\"22586091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ETV1 and ERG control a common transcriptional network but largely in opposing fashion in prostate cancer: ERG negatively regulates androgen receptor (AR) transcriptional program while ETV1 cooperates with AR signaling. ETV1 expression promotes autonomous testosterone production. Only ETV1 (not ERG) supports development of invasive adenocarcinoma under full Pten loss in mice.\",\n      \"method\": \"Targeted knock-in mouse models (Tmprss2-ETV1, Tmprss2-ERG), genetic epistasis with Pten loss, transcriptome profiling, androgen pathway analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knock-in models with genetic epistasis, transcriptome profiling; multiple orthogonal methods\",\n      \"pmids\": [\"23512661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"All 14-3-3 proteins except 14-3-3σ bind ETV1 in a phosphorylation-dependent manner dictated by Ser216. Non-σ 14-3-3 proteins protect ETV1 from degradation, synergize with ETV1 to activate MMP-1 and MMP-7 transcription, and promote ETV1-dependent migration and invasion.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis (S216), reporter assay, shRNA knockdown, Western blot (protein stability)\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, mutagenesis, functional reporter, and protein stability assay; multiple methods\",\n      \"pmids\": [\"23774214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Etv1 inactivation in mice reveals proprioceptor subclasses with differential Etv1-dependence for survival and differentiation, linked to levels of NT3 in muscle targets. Elevating muscle-derived NT3 can rescue loss of proprioceptors triggered by Etv1 inactivation, revealing a TrkC-activated Etv1-bypass pathway.\",\n      \"method\": \"Etv1 conditional knockout mice, NT3 overexpression rescue experiment, anatomical analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with specific cellular phenotype plus genetic rescue experiment\",\n      \"pmids\": [\"23522042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ETV1 transcriptionally upregulates Snail expression to induce epithelial-to-mesenchymal transition in gastric cancer cells; ETV1 overexpression in normal gastric epithelial cells increases invasiveness, and ETV1 knockdown reduces aggressiveness of invasive gastric cancer cells.\",\n      \"method\": \"Overexpression, siRNA knockdown, reporter assay, invasion assay, EMT marker analysis\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay for Snail promoter plus loss-of-function with invasion phenotype; single lab\",\n      \"pmids\": [\"24100634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The small molecule BRD32048 directly binds ETV1 protein, modulates ETV1-mediated transcriptional activity, inhibits invasion of ETV1-driven cancer cells, and inhibits p300-dependent acetylation of ETV1, thereby promoting ETV1 degradation.\",\n      \"method\": \"Small-molecule microarray screen, direct binding assay, reporter assay, invasion assay, Western blot (protein stability)\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding confirmed, multiple functional readouts; single lab\",\n      \"pmids\": [\"24737027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ETV1 directly binds to and cooperates with EWSR1 to transactivate Fgf10 promoter in limb bud mesenchyme; both Etv1 and Ewsr1 bind the conserved AGAAAR cluster in the Fgf10 promoter in vivo and in vitro; Etv1 directly binds the AGAAAR sequence in vitro. Etv1 and Ewsr1 are each necessary for Fgf10 expression and limb bud elongation.\",\n      \"method\": \"ChIP, in vitro DNA-binding assay, reporter assay, siRNA/dominant-negative loss-of-function, chick/mouse limb bud experiments\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro DNA-binding plus ChIP in vivo plus loss-of-function with specific phenotype\",\n      \"pmids\": [\"25109552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structures of the ETV1 ETS domain (alone and in complex with DNA) reveal that DNA backbone interactions account for most binding affinity. A coordinated network of water molecules mediates base selection upstream of the GGAA core. ETV1 crystallized as a disulfide-linked dimer; reduction of disulfide bonds (monomerization) increases DNA-binding affinity 40–200-fold, indicating a redox-dependent regulatory mechanism controlling ETV1 activity.\",\n      \"method\": \"X-ray crystallography, biochemical DNA-binding assay, redox manipulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus biochemical validation of redox regulation; rigorous structural biology study\",\n      \"pmids\": [\"25866208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MAP kinase activation downstream of KIT stabilizes ETV1 protein; ETV1 in turn positively regulates KIT expression, forming a positive feedback circuit. Combined KIT inhibition (imatinib) and MEK inhibition (MEK162) synergistically destabilize ETV1 and suppress GIST tumor growth, including complete regression in vivo. ETV1 is required for GIST initiation and proliferation in vivo, validated by Etv1 ablation in mouse Kit-activation models.\",\n      \"method\": \"Mouse genetics (Kit activation + Etv1 ablation), protein stability assay, combination drug treatment, in vitro and in vivo tumor growth assay\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse genetics, protein stability mechanism, and in vivo therapeutic validation with multiple methods\",\n      \"pmids\": [\"25572173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PDGFRA signaling stabilizes ETV1 protein in GIST cells via ERK-dependent mechanisms; PDGFRA knockdown or inhibition reduces ETV1 protein and expression of KIT, disrupting a KIT-ERK-ETV1-KIT signaling loop. ETV1 knockdown reduces KIT expression and GIST proliferation.\",\n      \"method\": \"siRNA knockdown, pharmacological inhibition (crenolanib), Western blot (protein stability/phosphorylation), cell proliferation assay\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown and pharmacological inhibition with mechanistic Western blot readouts; single lab\",\n      \"pmids\": [\"25865047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DNA-binding autoinhibition of ETV1 is mediated by cooperative intramolecular interactions: a C-terminal inhibitory α-helix packs against the ETS domain and perturbs the DNA-recognition helix conformation, while the N-terminal inhibitory domain (NID) is intrinsically disordered but makes transient intramolecular contacts with the DNA-recognition helix via NMR. Acetylation of specific NID lysines activates DNA binding.\",\n      \"method\": \"X-ray crystallography, NMR spectroscopy, acetylation assay, DNA-binding assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus NMR with functional validation of acetylation-dependent activation; multiple rigorous structural/biochemical methods\",\n      \"pmids\": [\"28161714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"JMJD2A (KDM4A) histone demethylase binds ETV1 and cooperates with it to drive prostate cancer; ETV1 facilitates JMJD2A recruitment to the YAP1 promoter, leading to changes in histone lysine methylation and increased YAP1 expression. Combined JMJD2A+ETV1 overexpression in Pten-haplodeficient mice causes prostate carcinoma formation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP (histone methylation), mouse transgenic model, shRNA knockdown, reporter assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, ChIP showing histone modifications, in vivo mouse model, and genetic rescue; multiple orthogonal methods\",\n      \"pmids\": [\"26731476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ETV1 is a critical regulator of fast conduction physiology in mouse heart; Etv1 is highly expressed in pectinated atrial myocardium and ventricular conduction system (VCS). Etv1 deficiency causes marked cardiac conduction defects, developmental VCS abnormalities, and loss of normal sodium current heterogeneity. Etv1 regulates expression of Nkx2-5, Gja5, and Scn5a.\",\n      \"method\": \"Etv1 knockout mice, cardiac electrophysiology (ECG, patch clamp), histological analysis, gene expression profiling\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with multiple specific electrophysiological phenotypes and downstream target gene identification\",\n      \"pmids\": [\"27775552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ER81 (ETV1) is functionally required in RET+ mechanosensory neurons for Pacinian corpuscle formation; RET signaling maintains Er81 expression; Er81 null neurons have deficient axon-Schwann cell interactions in corpuscles with reduced Nrg1 isoform expression not required for myelination, placing ER81 in a RET-ER81-NRG1 signaling pathway for Pacinian corpuscle development.\",\n      \"method\": \"Er81 knockout and Ret conditional knockout mice, genetic epistasis, Nrg1 isoform analysis, anatomical/histological analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic loss-of-function models with specific phenotypes establishing pathway order\",\n      \"pmids\": [\"27707970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ETV1 activates Sparc and Has2 (hyaluronan synthase 2) as downstream target genes (Sparc confirmed by luciferase assay and in vivo co-localization); ETV1 drives desmoplastic stromal expansion and metastasis in pancreatic cancer, and disruption of Sparc abrogates this phenotype.\",\n      \"method\": \"Luciferase reporter assay, orthotopic xenograft, 3D organoid culture, Etv1 conditional knockout in PDAC mice, immunohistochemistry\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay for target gene, genetic loss-of-function with in vivo phenotype; single lab\",\n      \"pmids\": [\"27318148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Hyperglycemia increases ICCs via MAPK1/MAPK3-dependent stabilization of ETV1 protein, which then upregulates KIT expression, causing rapid gastric emptying. This was demonstrated in hyperglycemic mouse models and in isolated ICC lineage cells with pharmacological MAPK manipulation.\",\n      \"method\": \"Mouse models (Leprdb/db, KitK641E/+), ICC cell culture, pharmacological MAPK inhibition, siRNA knockdown, Western blot (ETV1 protein stability), flow cytometry\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and RNAi manipulation with mechanistic protein stability readout; multiple methods in one lab\",\n      \"pmids\": [\"28438610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ETV1 overexpression in mouse cardiomyocytes causes atrial dilatation, fibrosis, thrombosis, and arrhythmia. ETV1-deficient mice do not develop atrial remodeling after angiotensin II treatment. ETV1-regulated genes include Ryr2, Jph2, Gja5, Kcnh2, Kcnk3, and Tbx5, identified by chromatin accessibility (ATAC-seq) and active chromatin (H3K27ac ChIP-seq) in isolated atrial cardiomyocytes.\",\n      \"method\": \"Cardiac myocyte-specific ETV1 overexpression and knockout mouse models, ATAC-seq, ChIP-seq (H3K27ac), echocardiography, electrophysiology\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain- and loss-of-function genetics with specific cardiac phenotypes plus genome-wide chromatin profiling\",\n      \"pmids\": [\"29930145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ETV1 promotes a His-Purkinje system (HPS) transcriptional program; cardiomyocyte-specific deletion of ETV1 decreases expression of Nkx2-5, Gja5, and Scn5a and causes HPS hypoplasia and ventricularization of sodium channel properties. Forced ETV1 expression in postnatal ventricular myocytes or human iPSC-derived cardiomyocytes promotes a HPS gene signature and increases inward sodium currents.\",\n      \"method\": \"Cardiomyocyte-specific knockout, viral ETV1 overexpression, human iPSC-cardiomyocyte model, electrophysiology (patch clamp), gene expression profiling\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain- and loss-of-function in multiple model systems including human iPSC-derived cells\",\n      \"pmids\": [\"29967479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ETV1 mediates FGF signaling effects on cancer-associated fibroblast (CAF) gene expression; FGF and TGF-β signaling oppositely modulate CAF effector genes, with ETV1 mediating the FGF effects. Genetic abrogation of ETV1 abolishes FGF-mediated gene regulation and leads to induction of TGF-β-responsive genes.\",\n      \"method\": \"Genetic abrogation (siRNA/CRISPR), pharmacological pathway inhibition, gene expression analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function in primary human fibroblasts with specific pathway readout; single lab\",\n      \"pmids\": [\"31461652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ETV1 forms complexes with SMAD4 (Co-IP). SMAD2, SMAD3, and SMAD4 overexpression impairs ETV1's ability to stimulate gene transcription. TGF-β1 inhibits ETV1-induced invasion. Conversely, ETV1 may enhance TGF-β signaling in PC3 cells. Sumoylation-deficient ETV1 shows enhanced interaction with HDAC1 but reduced interaction with SMAD4.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay, invasion assay, Western blot\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP confirming complex formation, functional reporter and invasion assay; single lab\",\n      \"pmids\": [\"31160676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ETV1 promotes HCC metastasis by transcriptionally upregulating PTK2 and c-MET (confirmed by luciferase reporter and ChIP). HGF upregulates ETV1 expression through c-MET-ERK1/2-ELK1 pathway, creating a positive feedback loop. Combined PTK2 and c-MET inhibition suppresses ETV1-mediated HCC metastasis.\",\n      \"method\": \"Luciferase reporter assay, ChIP, siRNA knockdown, transwell invasion assay, orthotopic metastatic mouse model\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assay for target genes, pathway epistasis, in vivo model; single lab\",\n      \"pmids\": [\"36109787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ETV1 directly binds to JMJD1A (histone demethylase) and cooperates with it (but not a catalytically inactive mutant) to induce the MMP1 gene promoter, similar to ETV1-JMJD2A cooperation. ETV1 and JMJD1A co-regulate FOXQ1 and other ETV1 target genes; both bind the FOXQ1 promoter. FOXQ1 overexpression partially rescues growth inhibitory effects of ETV1 ablation.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay, ChIP, RNA-seq, shRNA knockdown, catalytically inactive mutant\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, reporter assay with catalytic mutant control; single lab\",\n      \"pmids\": [\"33174020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ETV1 expression is decreased in the left atrium during cardiac pressure overload (in human heart failure patients and mouse models), contributing to electrical and structural remodeling. ETV1 levels directly correlate with NRG1, ERBB4, SCN5A, and GJA5 expression. Cardiomyocyte-selective Etv1 knockout mice display atrial conduction disease and upregulation of profibrotic programming.\",\n      \"method\": \"Human LA biobank gene expression profiling, two murine pressure overload models (TAC, Ang II), Etv1 cardiomyocyte-selective knockout, RNA-seq\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human clinical data corroborated by multiple mouse models and genetic knockout with specific cardiac phenotype\",\n      \"pmids\": [\"33225722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ETV1 can be sumoylated on four different lysine residues by SUMO1. Mutation of sumoylation sites modulates ETV1 transactivation at MMP1 promoter in a cell-type-specific manner. Sumoylation-deficient ETV1 shows enhanced interaction with HDAC1 but no change in complex formation with HDAC3 or JMJD2A, and is less able to bind SMAD4. In LNCaP prostate cancer cells, sumoylation-deficient ETV1 represses cell growth.\",\n      \"method\": \"SUMO modification assay, site-directed mutagenesis, reporter assay, co-immunoprecipitation, cell growth assay\",\n      \"journal\": \"International journal of clinical and experimental pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical sumoylation assay, Co-IP, functional reporter with mutagenesis; single lab\",\n      \"pmids\": [\"34367411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ETV1 regulates cholinergic interneuron (CIN) physiological properties in the striatum; Er81-specific ablation in CINs alters their molecular, morphological, and electrophysiological features, amplifying delayed-rectifier and hyperpolarization-activated currents and disrupting tonic/phasic activity. Er81 loss in CINs impairs pause responses to sensorimotor inputs and disrupts habit formation.\",\n      \"method\": \"Cell-type-specific Cre knockout mice, patch-clamp electrophysiology, in vivo recording in awake mice, behavioral assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific genetic knockout with specific electrophysiological and behavioral phenotypes\",\n      \"pmids\": [\"33849945\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CIC and ERF co-bind the proximal regulatory element of the ETV1 gene and mutually repress ETV1 transcription; concurrent genomic loss of CIC and ERF at chromosome 19q13.2 drives fusion-independent ETV1 upregulation in prostate cancer. Targeting ETV1 in CIC/ERF-deficient prostate cancer limits tumor growth.\",\n      \"method\": \"ChIP, shRNA knockdown, CRISPR-deletion, genomic analysis, tumor growth assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP establishing co-binding at ETV1 regulatory element, genetic loss-of-function of CIC/ERF with specific ETV1 upregulation and tumor growth readout\",\n      \"pmids\": [\"36383412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Etv1 promotes Schwann cell proliferation, migration, and differentiation, and is required for remyelination in vivo. Etv1 binds to the promoters of myelination-related genes MAG and Runx2 (confirmed by ChIP-qPCR and luciferase assay) to initiate their transcription. Knockdown of Etv1 in crushed sciatic nerve dramatically abrogates SC remyelination.\",\n      \"method\": \"In vivo sciatic nerve crush model, siRNA knockdown, ChIP-qPCR, luciferase reporter assay, transmission electron microscopy, proliferation/migration assays\",\n      \"journal\": \"Annals of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assay plus in vivo loss-of-function with histological phenotype; single lab\",\n      \"pmids\": [\"36110998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Plakophilin-3 (Pkp3) associates with ETV1 transcription factor and positively modulates ETV1-dependent transcriptional activity; demonstrated by co-immunoprecipitation in Xenopus and mammalian cells.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay, Xenopus embryo experiments\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP and reporter assay, single lab, no deep mechanistic characterization\",\n      \"pmids\": [\"24475179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Pax6 directly activates the Er81 promoter through a conserved upstream DNA sequence containing Pax6 binding sites; one specific Pax6 binding site is necessary and sufficient for full Er81 promoter activation. Er81-positive layer 5 neurons are absent in the rostrolateral cortex of Pax6-null mice.\",\n      \"method\": \"Reporter assay, site-directed mutagenesis of Pax6 binding sites, Pax6 knockout mouse analysis\",\n      \"journal\": \"BMC developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with mutagenesis plus genetic loss-of-function validation; single lab\",\n      \"pmids\": [\"18307776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ER81 and Sox-9 form a complex on the VE-cadherin promoter and are required for retinoic acid-mediated transcriptional regulation of VE-cadherin in breast cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, reporter assay, siRNA knockdown\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and Co-IP with functional reporter; single lab\",\n      \"pmids\": [\"18628953\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ETV1 (ER81) is an ETS-family transcription factor that binds DNA through its ETS domain (subject to redox-regulated disulfide dimerization and intramolecular autoinhibition relieved by acetylation), is activated by multi-site phosphorylation from ERK, RSK1, MSK1, PKA, and MK2 downstream of Ras/MAPK signaling, is acetylated by p300 (K33, K116) and P/CAF (K116) to increase DNA binding and stability, is sumoylated on four lysines to modulate cofactor recruitment, and interacts with CBP/p300, p160 coactivators, 14-3-3 proteins, JMJD2A/JMJD1A histone demethylases, SMAD4, Tpit, Sox-9, and Pkp3 to regulate transcription of target genes including MMP-1, hTERT, Smad7, Her2/neu, KIT, Nkx2-5, Gja5, Scn5a, YAP1, FOXQ1, Rcl, uPA, Sparc, PTK2, and c-MET; in vivo, ETV1 is essential for sensorimotor circuit formation, ICC lineage identity and GIST pathogenesis (where KIT/MAPK signaling prolongs ETV1 protein stability), cardiac fast-conduction programming, Pacinian corpuscle development, cerebellar granule cell maturation, and cholinergic interneuron function, while CIC and ERF act as direct transcriptional repressors of ETV1 in prostate tissue.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ETV1 (ER81) is a sequence-specific ETS-family transcription factor that binds GGAA-core DNA elements through its C-terminal ETS domain to activate transcription, functioning across developmental programming and oncogenic gene networks [#1, #30]. Its DNA-binding activity is gated at multiple levels: redox-dependent disulfide dimerization (monomerization raises affinity 40–200-fold) and an intramolecular autoinhibition in which a C-terminal inhibitory helix and an intrinsically disordered N-terminal inhibitory domain perturb the DNA-recognition helix, an autoinhibition relieved by acetylation of N-terminal lysines [#30, #33]. ETV1 is a principal nuclear effector of Ras/MAPK signaling, directly phosphorylated by ERK and by the downstream kinases RSK1, MSK1, MK2 and PKA at serine residues (notably Ser191/Ser216) that tune its transactivation and DNA binding [#2, #7, #8, #11]. It is acetylated by p300/P/CAF at Lys33 and Lys116 to enhance DNA binding, transactivation, and protein half-life, and engages the coactivators CBP/p300 and p160 family members through its ETS domain [#3, #10, #15]; phospho-dependent binding of 14-3-3 proteins (via Ser216) protects ETV1 from degradation and promotes invasion [#25]. Through these inputs ETV1 directly binds and activates target promoters including MMP-1, hTERT, Her2/neu, Smad7, and Rcl, frequently in HER2/Neu-driven positive feedback loops [#6, #14, #9, #12, #18]. In oncogenesis ETV1 acts as an enhancer-binding master regulator: it specifies interstitial cell of Cajal (ICC) lineage identity and drives GIST, where KIT/PDGFRA-MAPK signaling stabilizes ETV1 protein while ETV1 upregulates KIT in a self-reinforcing circuit [#19, #31, #32]; it cooperates with the histone demethylases JMJD2A and JMJD1A to remodel chromatin at YAP1, FOXQ1 and MMP1 in prostate cancer [#34, #44]; and it cooperates with androgen-receptor signaling, while CIC and ERF act as direct transcriptional repressors of the ETV1 gene [#16, #24, #48]. In vivo, ETV1 is essential for sensorimotor circuit assembly and proprioceptor differentiation, Pacinian corpuscle formation, cerebellar granule cell and striatal cholinergic interneuron maturation, Schwann-cell remyelination, and cardiac fast-conduction programming, where it regulates Nkx2-5, Gja5, and Scn5a [#4, #26, #36, #22, #47, #49, #35, #40].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established ETV1 as a sequence-specific DNA-binding ETS transcription factor and tied it to oncogenic rearrangement, defining its molecular identity.\",\n      \"evidence\": \"Molecular cloning and DNA-binding assay of the EWS-ETV1 fusion from Ewing's sarcoma; reporter and immunocytochemistry showing nuclear transcriptional activator function\",\n      \"pmids\": [\"7700648\", \"7651741\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous target genes not yet identified\", \"Regulatory inputs controlling activity unknown\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Placed ETV1 downstream of Ras/Raf/MEK/ERK signaling, identifying it as a phosphorylation-controlled effector of the MAPK cascade.\",\n      \"evidence\": \"In vitro ERK-1 kinase assay, dominant-negative Raf/ERK epistasis, reporter and immunolocalization\",\n      \"pmids\": [\"8657129\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phospho-acceptor sites not mapped\", \"Identity of the C-terminal ERK-stimulated kinase undefined\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrated that ETV1 recruits the CBP/p300 coactivators through its ETS domain, linking its transactivation to chromatin-modifying machinery, and showed it is required in vivo for proprioceptive afferent-motor neuron connectivity.\",\n      \"evidence\": \"Reciprocal Co-IP, confocal colocalization, domain mapping; Er81 knockout mouse anatomical tracing and behavior\",\n      \"pmids\": [\"10982847\", \"10850491\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct neuronal target genes not identified\", \"Coactivator recruitment mechanism on native promoters not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified direct ETV1 target promoters (MMP-1, Her2/neu) and resolved a multi-kinase phosphorylation code (ERK-driven N-terminal sites; MK2 at Ser191/Ser216) that can either enhance or suppress activity.\",\n      \"evidence\": \"Promoter reporter assays, site-directed mutagenesis of phospho-sites, in vitro kinase assays, co-transfection with HER2/Neu\",\n      \"pmids\": [\"11593430\", \"11551945\", \"12112028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type determinants of activating vs inhibitory phosphorylation unclear\", \"In vivo relevance of individual sites untested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Expanded the kinase repertoire (RSK1, PKA) acting on ETV1 and showed phosphorylation at distinct sites can uncouple DNA binding from transactivation.\",\n      \"evidence\": \"Co-IP, in vitro kinase assays, mutagenesis of Ser191/Ser216/Ser334, reporter assays\",\n      \"pmids\": [\"12213813\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for Ser334-dependent DNA-binding loss unknown\", \"Combinatorial effects of multiple kinases not dissected\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined acetylation by p300/P/CAF at Lys33/Lys116 as a switch enhancing ETV1 DNA binding, transactivation, and protein stability, and added MSK1/p38 as another activating input.\",\n      \"evidence\": \"In vitro/in vivo acetylation assays, mutagenesis, pulse-chase stability assays, kinase assays, reporter assays\",\n      \"pmids\": [\"12917345\", \"12569367\", \"12947087\", \"14550555\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Deacetylases reversing these marks not identified\", \"Interplay between phosphorylation and acetylation timing unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Linked ETV1 to telomerase activation (hTERT) and confirmed p160 coactivators (ACTR/SRC-1/GRIP-1) cooperate with p300 acetyltransferase activity to amplify ETV1 output in HER2/Neu-driven cancer.\",\n      \"evidence\": \"Promoter mutagenesis, dominant-negative ETV1, telomerase activity assay, Co-IP, acetyltransferase assay\",\n      \"pmids\": [\"14673140\", \"14747462\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ETV1 controls hTERT in physiological settings untested\", \"Coactivator complex stoichiometry undefined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Connected ETV1 to androgen-receptor signaling and prostate cancer invasion, and identified Rcl as a direct ChIP-confirmed target supporting tumor growth; also placed ETV1 in Pax6- and Sox-9-dependent transcriptional contexts.\",\n      \"evidence\": \"ChIP, siRNA knockdown, invasion and xenograft assays; Pax6 promoter mutagenesis and knockout mice; ER81-Sox9 Co-IP/ChIP\",\n      \"pmids\": [\"17505060\", \"18794142\", \"18726892\", \"18307776\", \"18628953\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide ETV1 occupancy not yet mapped\", \"Distinction between truncated and full-length ETV1 mechanisms incomplete\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established ETV1 as a genome-wide enhancer-binding master regulator of the ICC lineage and GIST, with KIT-MAPK signaling stabilizing ETV1 protein, and extended its oncogenic reach to melanoma via MITF.\",\n      \"evidence\": \"Genome-wide ChIP-seq, transcriptome profiling, shRNA knockdown, ICC-lineage mouse genetics, protein stability assays; melanocyte transformation and MITF epistasis\",\n      \"pmids\": [\"20927104\", \"20160028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of MAPK-dependent protein stabilization not molecularly defined\", \"Enhancer co-factors driving ICC identity incompletely cataloged\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined opposing roles of ETV1 and ERG in the prostate AR program, established 14-3-3 binding (via Ser216) as a stability and invasion-promoting mechanism, and refined Etv1 dependence of proprioceptor subclasses via muscle NT3.\",\n      \"evidence\": \"Knock-in mouse models with Pten epistasis, transcriptome profiling; Co-IP/mutagenesis/stability assays; conditional knockout with NT3 rescue; Snail/EMT reporter studies\",\n      \"pmids\": [\"23512661\", \"23774214\", \"23522042\", \"24100634\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of ETV1 vs ERG target selectivity unresolved\", \"TrkC-Etv1 bypass pathway molecular components incomplete\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided structural mechanism for ETV1 DNA recognition and autoregulation (redox dimerization and intramolecular autoinhibition relieved by acetylation), and validated the KIT/PDGFRA-ERK-ETV1 protein-stability feedback circuit as a GIST therapeutic vulnerability.\",\n      \"evidence\": \"X-ray crystallography, NMR, redox/DNA-binding assays; mouse Kit-activation + Etv1 ablation genetics, combination KIT/MEK inhibition with tumor regression, PDGFRA knockdown\",\n      \"pmids\": [\"25866208\", \"28161714\", \"25572173\", \"25865047\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of redox-dependent dimerization unconfirmed\", \"E3 ligase mediating ETV1 degradation not identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified histone-demethylase partnership (JMJD2A) driving prostate carcinoma via chromatin remodeling at YAP1, and established ETV1 as a regulator of cardiac fast-conduction and Pacinian corpuscle programs through specific downstream genes.\",\n      \"evidence\": \"Co-IP, histone-methylation ChIP, Pten-haplodeficient mouse model; Etv1 knockout cardiac electrophysiology with Nkx2-5/Gja5/Scn5a profiling; Ret/Er81 epistasis and Nrg1 analysis\",\n      \"pmids\": [\"26731476\", \"27775552\", \"27707970\", \"27318148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect regulation of cardiac conduction genes not fully separated\", \"How ETV1 directs JMJD2A locus specificity unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined ETV1 dose-dependent control of cardiac chromatin and His-Purkinje/atrial gene programs using genome-wide accessibility and active-chromatin profiling plus reciprocal gain/loss-of-function including human iPSC-cardiomyocytes.\",\n      \"evidence\": \"Cardiomyocyte-specific overexpression/knockout mice, ATAC-seq, H3K27ac ChIP-seq, electrophysiology, iPSC-CM models\",\n      \"pmids\": [\"29930145\", \"29967479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream regulators setting cardiac ETV1 levels unclear\", \"Direct enhancer targets within HPS program not all validated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Positioned ETV1 as an FGF-signaling effector antagonizing TGF-β programs, characterized SMAD4 complex formation modulating its activity, and identified PTK2/c-MET as direct metastatic targets in HCC.\",\n      \"evidence\": \"siRNA/CRISPR abrogation in fibroblasts; ETV1-SMAD4 Co-IP and reporter/invasion assays; ChIP/reporter for PTK2 and c-MET with orthotopic metastasis model\",\n      \"pmids\": [\"31461652\", \"31160676\", \"36109787\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of ETV1-SMAD4 functional antagonism vs cooperation context-dependent and unresolved\", \"Single-lab Co-IP evidence for SMAD interactions\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Added sumoylation on four lysines as a cofactor-recruitment switch (modulating HDAC1/SMAD4 binding) and established ETV1 control of striatal cholinergic interneuron physiology and habit formation.\",\n      \"evidence\": \"SUMO modification assay, mutagenesis, Co-IP, reporter/growth assays; cell-type-specific knockout with patch-clamp, in vivo recording and behavior\",\n      \"pmids\": [\"34367411\", \"33849945\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO E3 ligases for ETV1 not identified\", \"Functional integration of sumoylation with phosphorylation/acetylation undefined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified CIC and ERF as direct co-repressors of the ETV1 gene whose genomic loss drives fusion-independent ETV1 upregulation, and established ETV1 as required for Schwann-cell remyelination via MAG and Runx2.\",\n      \"evidence\": \"ChIP co-binding at ETV1 regulatory element, shRNA/CRISPR loss-of-function, tumor growth assays; sciatic nerve crush model with ChIP-qPCR/reporter and EM\",\n      \"pmids\": [\"36383412\", \"36110998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CIC/ERF repression operates in non-prostate tissues untested\", \"Schwann-cell findings from a single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the layered post-translational code (phosphorylation, acetylation, sumoylation, redox dimerization) is integrated combinatorially to dictate ETV1 locus selection and tissue-specific enhancer occupancy remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking modification state to genome-wide binding\", \"E3 ligase and deacetylase/desumoylase machinery for ETV1 unidentified\", \"Mechanism of tissue-specific cofactor choice unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 6, 30, 33]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 6, 19, 35]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 6, 14, 19]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 8, 31, 32]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [19, 24, 31, 48]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 26, 35, 36, 40]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CREBBP\", \"EP300\", \"RPS6KA1\", \"YWHAZ\", \"KDM4A\", \"KDM3A\", \"SMAD4\", \"SOX9\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":7,"faith_total":7,"faith_pct":100.0}}