{"gene":"ENAH","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":1996,"finding":"Mena contains a conserved EVH1 domain that targets it to proteins containing a specific proline-rich motif (FPPPP); Mena associates with the surface of Listeria monocytogenes and with the G-actin binding protein profilin, and expression of neural-enriched Mena isoforms in fibroblasts induces abnormal F-actin-rich outgrowths, establishing a role in actin polymerization and microfilament assembly.","method":"Affinity chromatography, subcellular localization by immunofluorescence, overexpression in fibroblasts with morphological readout","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (affinity chromatography, co-localization, overexpression phenotype), foundational paper replicated by subsequent work","pmids":["8861907"],"is_preprint":false},{"year":1999,"finding":"Mena binds directly to Profilin I; genetic epistasis shows that Mena-deficient mice heterozygous for Profilin I deletion die in utero with neurulation defects, placing Mena functionally upstream of or in the same pathway as Profilin I in actin-dependent processes. Mena is concentrated at the tips of growth cone filopodia in primary neurons and is required for commissure formation.","method":"Direct binding assay, genetic double-mutant analysis (Mena-/- x Profilin I+/-), immunofluorescence in primary neurons","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic epistasis plus direct binding assay, replicated across labs","pmids":["10069337"],"is_preprint":false},{"year":1997,"finding":"The FE65 WW domain binds directly to proline-rich sequences in Mena containing a PPLP core motif; the Mena–FE65 complex forms in vivo as demonstrated by co-immunoprecipitation from COS cell extracts.","method":"Affinity purification from mouse brain lysates, SPOTS peptide competition assay, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (affinity purification, peptide mapping, co-IP), direct binding established","pmids":["9407065"],"is_preprint":false},{"year":2001,"finding":"Cdc42 interacts with IRSp53 at a partial CRIB motif, relieving an autoinhibitory intramolecular interaction, which allows the IRSp53 SH3 domain to recruit Mena; the resulting IRSp53:Mena complex acts synergistically to initiate actin filament assembly into filopodia.","method":"Affinity chromatography (SH3 domain pulldown to identify Mena), overexpression epistasis, dominant-negative fragment inhibition assay","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — affinity chromatography identification plus functional epistasis with dominant-negative fragments, replicated in subsequent studies","pmids":["11696321"],"is_preprint":false},{"year":2003,"finding":"Mena binds directly to profilin I and profilin IIa and to members of the Mena/VASP family; gephyrin co-precipitates with profilin and Mena/VASP from brain tissue, with interaction requiring the E-domain of gephyrin (not the proline-rich domain), and gephyrin competes with G-actin and phospholipids for the profilin binding site.","method":"Co-precipitation from tissue and cell lysates, domain mapping, competition assay","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical methods in single lab, no reciprocal structural validation","pmids":["12967995"],"is_preprint":false},{"year":2003,"finding":"Abl interactor 1 (Abi-1) binds to Mena via the EVH1 domain of Mena and the polyproline region of Abi-1, and dramatically promotes c-Abl-mediated tyrosine phosphorylation of Mena specifically at Tyr-296.","method":"Yeast two-hybrid, co-immunoprecipitation in mammalian cells, site-directed mutagenesis (Tyr296 mutant)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis identifying specific phosphorylation site combined with co-IP and two-hybrid, single lab but three orthogonal methods","pmids":["12672821"],"is_preprint":false},{"year":2004,"finding":"Myosin X (M10) binds to Mena/VASP and co-localizes with it at filopodial tips; live-cell imaging shows EGFP-M10 and RFP-VASP moving together from the base to the tip of filopodia, and the amount of VASP at the tip is proportional to M10 levels, demonstrating that Myosin X transports Mena/VASP to filopodial tips.","method":"Co-immunoprecipitation, immunocytochemistry, live fluorescence microscopy (co-movement assay)","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP plus live imaging showing co-movement, single lab","pmids":["15158464"],"is_preprint":false},{"year":2004,"finding":"Genetic deletion of both Mena and VASP causes perinatal lethality with defects in neurulation, craniofacial structures, and CNS/PNS fiber tracts, demonstrating functional redundancy between Mena and VASP in actin-dependent developmental processes.","method":"Double-knockout mouse genetics with developmental phenotype analysis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic double-KO with defined developmental phenotypes, complements single-KO data from prior work","pmids":["15371503"],"is_preprint":false},{"year":2004,"finding":"The EVH1 domain of Mena (Mena1-112) displays paralog-specific binding: a miniature protein mimicking the ActA PPII helix binds Mena EVH1 with high affinity and discriminates between Mena, VASP, and Evl EVH1 domains; this miniature protein competed with ActA in Xenopus extracts and decreased L. monocytogenes actin-based motility.","method":"In vitro binding assay with designed miniature protein, Xenopus egg extract motility assay","journal":"Journal of the American Chemical Society","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with designed ligand plus functional cell-extract assay demonstrating paralog specificity","pmids":["14709031"],"is_preprint":false},{"year":2006,"finding":"Zyxin is required for proper localization of Ena/VASP proteins (including Mena) to focal adhesions; zyxin-null fibroblasts show severely reduced Mena/VASP accumulation at focal adhesions and exhibit deficits in actin stress fiber remodeling and enhanced cell motility.","method":"Homologous recombination knockout, immunofluorescence localization, cell motility assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic knockout with multiple phenotypic readouts establishing zyxin as required for Mena focal-adhesion targeting","pmids":["16505170"],"is_preprint":false},{"year":2006,"finding":"Xin (CMYA1) directly binds the EVH1 domain of Mena and VASP, and in adult heart, Xin and Mena/VASP co-localize with filamin c at intercalated discs; different Xin isoforms produced by intraexonic splicing associate differentially with Mena/VASP.","method":"Direct binding assay (EVH1 domain), immunofluorescence co-localization in cardiomyocytes","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct binding plus co-localization, single lab","pmids":["16631741"],"is_preprint":false},{"year":2007,"finding":"The LIM3 domain of Tes binds specifically to the EVH1 domain of Mena (but not VASP or Evl), occludes the canonical FPPPP-binding site, and competes with FPPPP-containing proteins; crystal structure of the LIM3:EVH1 complex reveals the molecular basis of specificity. LIM3 expression displaces Mena from the leading edge and focal adhesions and regulates cell migration through a Mena-dependent mechanism.","method":"Crystal structure determination, in vitro binding assay, structure-based gain-of-function mutagenesis, cell-based localization and migration assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus functional cell assay, all in single rigorous study","pmids":["18158903"],"is_preprint":false},{"year":2007,"finding":"Synaptopodin directly binds IRSp53 and blocks the binding of Cdc42 and Mena to IRSp53, thereby suppressing Cdc42:IRSp53:Mena-initiated filopodia formation. A Mena inhibitor (FP4-Mito) suppressed aberrant filopodia in synaptopodin-knockdown podocytes and protected mice against LPS-induced proteinuria.","method":"Direct binding assay, siRNA knockdown with filopodia quantification, in vivo LPS-proteinuria model with FP4-Mito inhibitor","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding assay plus in vivo functional rescue, multiple methods","pmids":["17569780"],"is_preprint":false},{"year":2007,"finding":"EGF treatment upregulates hMena and its splice variant hMena+11a and specifically increases phosphorylation of the hMena+11a isoform, which in turn leads to increased p42/44 MAPK activation and cell proliferation; hMena knockdown reduces MAPK phosphorylation and EGF-driven proliferative response.","method":"Isoform-specific cloning, Western blot phosphorylation analysis, siRNA knockdown with MAPK/proliferation readout","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, multiple readouts but no identification of the kinase writing the phosphorylation","pmids":["17363586"],"is_preprint":false},{"year":2008,"finding":"The Mena invasion isoform MenaINV sensitizes carcinoma cells to EGF-induced membrane protrusion and matrix degradation, and increases lung metastasis; MenaINV is more effective than canonical Mena in driving metastases and EGF-dependent invasion in vivo and in vitro.","method":"Forced expression, in vitro invasion assay, in vivo mouse xenograft metastasis model, in vivo invasion assay","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo and in vitro assays with multiple isoforms and xenograft models, replicated by subsequent work","pmids":["19081071"],"is_preprint":false},{"year":2011,"finding":"MenaINV promotes coordinated streaming motility, transendothelial migration, and intravasation dependent on a macrophage-tumor cell paracrine loop. Mena11a expression decreases CSF1 expression and ablates paracrine-mediated invasion and intravasation.","method":"Intravital multiphoton microscopy, transendothelial migration assay, in vivo intravasation quantification, paracrine co-culture experiments","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple in vivo and in vitro assays with mechanistic dissection of paracrine dependency","pmids":["21670198"],"is_preprint":false},{"year":2012,"finding":"Mena directly binds the carboxy-terminal portion of the α5 integrin cytoplasmic tail via a 91-residue region containing 13 'LERER' repeats; the Mena–α5β1 complex is required for 'outside-in' α5β1 functions including FAK and paxillin phosphorylation, fibrillar adhesion formation, fibronectin fibrillogenesis, and control of cell migration speed.","method":"Direct binding assay (pull-down with defined domain), co-immunoprecipitation, mutagenesis mapping, fibronectin fibrillogenesis assay, fibrillar adhesion immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct binding with domain mapping plus multiple functional readouts, single comprehensive study","pmids":["22908313"],"is_preprint":false},{"year":2012,"finding":"MENA is a transcriptional target of the Wnt/β-catenin pathway; TCF4 binding sites in the MENA promoter are functional as shown by luciferase reporter assays, β-catenin/TCF4 overexpression increases MENA mRNA, and chromatin immunoprecipitation shows direct interaction of β-catenin with the MENA promoter in cell lines and mouse tissues.","method":"Luciferase reporter assay, chromatin immunoprecipitation (ChIP), overexpression and dominant-negative TCF4","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP plus luciferase reporter plus genetic overexpression/DN, multiple orthogonal methods in single lab","pmids":["22615875"],"is_preprint":false},{"year":2012,"finding":"hMENA splicing is regulated by ESRP1; forced expression of ESRP1 in invasive mesenchymal breast cancer cells causes re-expression of hMENA(11a), a mesenchymal-to-epithelial transition-like phenotypic switch, and decreased cell invasion.","method":"ESRP1 forced expression with isoform-specific RT-PCR, invasion assay, cytoskeletal architecture analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional rescue experiment with defined splicing regulator, single lab","pmids":["23129656"],"is_preprint":false},{"year":2013,"finding":"Lamellipodin (Lpd) forms a complex with the EGFR and with Mena; knockdown of Lpd or Mena impairs clathrin-mediated endocytosis (CME) of the EGFR, while Lpd overexpression increases EGFR uptake in an F-actin-dependent manner. Lpd directly interacts with endophilin and localizes to clathrin-coated pits before vesicle scission.","method":"Co-immunoprecipitation, siRNA knockdown with EGFR endocytosis assay, live-cell imaging of clathrin-coated pits","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, KD phenotype, and live imaging, multiple orthogonal methods in single lab","pmids":["24076656"],"is_preprint":false},{"year":2013,"finding":"Mena and VASP interact with the αII-Spectrin SH3i splice variant specifically at Z-discs and intercalated discs in cardiomyocytes; Mena/VASP double-deficiency disrupts β-actin networks at these structures and causes dilated cardiomyopathy with conduction abnormalities.","method":"Co-immunoprecipitation, immunofluorescence fractionation, double-knockout mouse model with echocardiography and ECG","journal":"Cell communication and signaling : CCS","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic DKO with cardiac phenotype plus biochemical interaction data","pmids":["23937664"],"is_preprint":false},{"year":2015,"finding":"Mena constitutively associates with the tyrosine phosphatase PTP1B and mediates a negative feedback mechanism on EGFR signaling: upon EGF stimulation, Mena–PTP1B complexes are recruited to the EGFR, causing receptor dephosphorylation. Mena also interacts with SHIP2, which is required for PTP1B recruitment to the EGFR. MenaINV expression impairs PTP1B recruitment to the EGFR, explaining MenaINV-mediated sensitization to EGF.","method":"Co-immunoprecipitation (Mena–PTP1B, Mena–SHIP2, EGFR complexes), siRNA knockdown with phospho-EGFR readout, motility assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple co-IPs establishing the complex, mechanistic KD experiments with defined molecular readout","pmids":["26337385"],"is_preprint":false},{"year":2015,"finding":"Mena interacts with GRASP65 on Golgi membranes; depletion of Mena or disruption of actin polymerization causes Golgi fragmentation. In vitro, Mena and microfilaments enhance GRASP65 oligomerization and Golgi membrane fusion, coupling actin polymerization to Golgi ribbon linking.","method":"Biochemical co-purification, in vitro GRASP65 oligomerization assay, Mena depletion with Golgi morphology readout","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro reconstitution plus cell depletion, single lab","pmids":["26538023"],"is_preprint":false},{"year":2016,"finding":"MenaINV is recruited to invadopodium precursors shortly after assembly and promotes phosphorylation of cortactin tyrosine 421; MenaINV reduces localization of the phosphatase PTP1B to the invadopodium, thereby inhibiting cortactin dephosphorylation and promoting invadopodium maturation.","method":"Fluorescence live imaging of invadopodium assembly, phospho-cortactin immunofluorescence, PTP1B localization assay by imaging, isoform overexpression","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — imaging-based mechanistic dissection in single lab, no direct biochemical reconstitution of PTP1B displacement","pmids":["27824079"],"is_preprint":false},{"year":2016,"finding":"MenaINV expression alters the ratio of dynamic to stable microtubule populations in paclitaxel-treated cells and increases MAPK/ERK signaling; co-treatment with MEK inhibitor restores paclitaxel sensitivity by driving microtubule stabilization, establishing a mechanism for MENA-mediated taxane resistance.","method":"Microtubule stability assay (tubulin fractionation), ERK phosphorylation Western blot, MEK inhibitor co-treatment rescue experiment","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — mechanistic pharmacological rescue experiment, single lab, multiple readouts","pmids":["27811011"],"is_preprint":false},{"year":2016,"finding":"Macrophage contact with tumor cells activates Notch1 signaling, which upregulates MenaINV transcription; Notch1 and MenaINV are both required for macrophage-induced invadopodium formation and tumor cell transendothelial migration; Notch pathway inhibition blocks tumor cell dissemination in vivo.","method":"Notch1 siRNA knockdown with invadopodium and transendothelial migration readouts, MENA promoter transcription assay, in vivo tumor dissemination assay with Notch inhibitor","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional epistasis (Notch1→MenaINV→invadopodium), in vitro and in vivo, single lab","pmids":["27901093"],"is_preprint":false},{"year":2016,"finding":"The Mena11a isoform decreases actin polymerization and growth-factor-stimulated lamellipodia protrusion, slows mesenchymal-like cell motility, and its depletion in epithelial cells perturbs cell:cell junctions. A phosphorylation site within the 11a exon is required for some Mena11a-specific functions.","method":"Isoform-specific siRNA, actin polymerization assay, membrane protrusion TIRF imaging, cell motility tracking, phospho-site mutagenesis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods including mutagenesis of phosphorylation site, single lab","pmids":["27748415"],"is_preprint":false},{"year":2016,"finding":"SHIP2 directly interacts with Mena (but not VASP) via specific biochemical interactions and recruits Mena to invadopodia; disruption of the SHIP2–Mena interaction reduces ECM degradation, in vitro invasion, and in vivo metastasis.","method":"Co-immunoprecipitation, structure-function analysis, invadopodium degradation assay, in vivo metastasis model","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP with domain mapping plus in vitro functional assay plus in vivo metastasis","pmids":["27597754"],"is_preprint":false},{"year":2017,"finding":"Mena forms a ribonucleoprotein complex with RNA-binding proteins HnrnpK and PCBP1 in developing neurons, and this complex regulates local translation of specific mRNAs including dyrk1a in axons; Mena is required for BDNF-stimulated local translation of dyrk1a.","method":"RNA immunoprecipitation, co-immunoprecipitation with RBPs, polysome/translation assay, BDNF stimulation with reporter translation assay, RNA-seq of Mena-associated mRNAs","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP of RNP complex plus functional translation assay with defined mRNA substrate plus BDNF stimulus, multiple orthogonal methods","pmids":["28735747"],"is_preprint":false},{"year":2019,"finding":"PTBP1 binds to polypyrimidine sequences on introns flanking MENA exon 11a (confirmed by RNA pulldown and mutation analysis) and promotes exon 11a skipping; PTBP1 knockdown inhibits MenaΔ11a production and reduces lung cancer cell migration and invasion, while overexpressed MenaΔ11a rescues PTBP1-driven invasion.","method":"RNA pulldown assay, mutational analysis of binding sequences, shRNA knockdown with isoform-specific RT-PCR, invasion and migration assays","journal":"Biochimica et biophysica acta. Gene regulatory mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA-protein binding assay with mutation validation plus functional epistasis, single lab","pmids":["31075540"],"is_preprint":false},{"year":2020,"finding":"Mena/VASP-based filament assembly at the leading edge requires profilin 1 (PFN1); in PFN1 knockout cells, Mena/VASP is non-functional at the leading edge and Arp2/3 no longer localizes there; varying PFN1 concentrations dictate the balance between Mena/VASP-driven filopodia and Arp2/3-driven lamellipodia.","method":"PFN1 CRISPR/siRNA knockout, leading-edge immunofluorescence, actin polymerization assay, live-cell imaging of filopodia/lamellipodia","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined cellular phenotype and mechanistic dissection, single lab","pmids":["32470361"],"is_preprint":false},{"year":2020,"finding":"Hypoxia-driven TGF-β signaling transcriptionally represses ESRP1 via SLUG and RBFOX2, leading to skipping of MENA exon 11a and production of the pro-metastatic hMENAΔ11a isoform; exosomal TGF-β contributes to this signaling under hypoxia.","method":"TGF-β pathway manipulation, ESRP1 knockdown/overexpression with isoform-specific RT-PCR, ChIP for SLUG at ESRP1 promoter, exosome co-culture experiments","journal":"NAR cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional splicing rescue experiments, single lab","pmids":["33089214"],"is_preprint":false},{"year":2022,"finding":"A proteomic screen of 36-residue proteome-derived peptides against the ENAH EVH1 domain revealed that a diverged pocket on ENAH EVH1 (relative to other Ena/VASP paralogs) recognizes extended SLiMs with flanking prolines; many high-affinity binders use a noncanonical secondary site on EVH1 when harboring two proline-rich motifs; PCARE uses a 23-residue region to achieve the highest known affinity for ENAH EVH1. These interactions display thermodynamic signatures consistent with bivalent engagement.","method":"Proteomic peptide screen, structural analysis of EVH1 domain interactions, isothermal titration calorimetry, mutagenesis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — structural mapping, thermodynamic analysis, and mutagenesis in single comprehensive study","pmids":["35076015"],"is_preprint":false},{"year":2023,"finding":"Matrix stiffness increases MENA expression via focal adhesion kinase (FAK) activity and promotes intravasation; stiffness also decreases ESRP1 expression, triggering alternative splicing of MENA to reduce MENA11a, which further enhances contractility and intravasation.","method":"Tunable hydrogel 3D culture, FAK inhibition, ESRP1 knockdown/overexpression with isoform-specific assays, mouse mammary intravasation model, TCGA expression analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro mechanistic dissection plus in vivo model, single lab","pmids":["37027295"],"is_preprint":false},{"year":2011,"finding":"Mena associates with active Rac1 in cardiomyocytes; Mena knockdown increases Rac1 activity and alters connexin 43 (Cx43) expression, localization, and trafficking at the intercalated disc, resulting in faster intercellular communication; constitutively active Rac1 overexpression increases Mena expression and causes lateral redistribution of Cx43.","method":"Co-immunoprecipitation of Mena–Rac1, Rac1 activity pull-down assay, RNAi knockdown with Cx43 localization and dye transfer assays, constitutively active Rac1 mouse model","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional epistasis with Rac1 activity assay, single lab","pmids":["24186093"],"is_preprint":false},{"year":2011,"finding":"Genetic deletion of Mena in adult mice causes cardiac dysfunction with reduced fractional shortening, prolonged PR and QRS intervals, disrupted intercalated disc ultrastructure, mislocalization of connexin 43 to lateral cardiomyocyte borders, increased Cx43 expression, and reduced vinculin.","method":"Mena knockout mouse model, echocardiography, ECG, optical mapping, electron microscopy, immunofluorescence","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with multiple orthogonal cardiac phenotype readouts","pmids":["21335464"],"is_preprint":false},{"year":2014,"finding":"MENA knockdown in hepatocellular carcinoma cells decreases RhoA activity (measured by pull-down assay), reduces filopodia and stress fibers, and suppresses migration and invasion; ROCK inhibition diminishes the difference between MENA knockdown and control cells, placing MENA upstream of RhoA–ROCK in promoting HCC motility.","method":"shRNA knockdown, RhoA activity pull-down assay, ROCK inhibitor epistasis, transwell migration and invasion assay","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pull-down activity assay plus pharmacological epistasis, single lab","pmids":["24859350"],"is_preprint":false},{"year":2015,"finding":"A thioredoxin-fold protein Sh3bgr specifically localizes to the Z-line in mature sarcomeres and regulates localization of Enah for sarcomere formation; morpholino knockdown of sh3bgr in Xenopus disrupts sarcomere formation and Enah localization, while Sh3bgr overexpression causes abnormal sarcomere assembly.","method":"Morpholino knockdown in Xenopus, rescue experiments, immunofluorescence localization of Enah","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function plus localization assay in Xenopus model, single lab","pmids":["26116879"],"is_preprint":false},{"year":2019,"finding":"TES interacts with Mena (identified by immunoprecipitation-based mass spectrometry) and inhibits the interaction of Mena with Lamellipodin (Lpd); TES suppresses GC cell migration and invasion in a Mena-dependent fashion.","method":"Immunoprecipitation–mass spectrometry, co-IP to map TES–Mena–Lpd complex, siRNA epistasis (TES effect abolished by Mena knockdown)","journal":"Cancer communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — IP-MS identification plus functional epistasis, single lab","pmids":["30728082"],"is_preprint":false}],"current_model":"ENAH/Mena is an actin-regulatory scaffold protein of the Ena/VASP family that uses its EVH1 domain to bind FPPPP and related proline-rich motifs in cytoskeletal proteins (zyxin, lamellipodin, Xin, vinculin), its central proline-rich region to engage profilin, SH3 domains, and the FE65 WW domain, and its EVH2 domain for F-actin and G-actin interactions; it is targeted to focal adhesions, lamellipodia tips, filopodial tips (via Myosin X transport), and invadopodia, where it antagonizes barbed-end capping to promote actin polymerization and cell motility. Mena forms regulated complexes with α5β1 integrin (via LERER repeats), PTP1B/SHIP2 (attenuating EGFR signaling), IRSp53 downstream of Cdc42 (initiating filopodia), the gephyrin scaffold (linking inhibitory synapses to microfilaments), and an hnRNP complex (controlling local mRNA translation in axons). Alternative splicing produces functionally distinct isoforms: MenaINV sensitizes cells to EGF by impairing PTP1B-mediated EGFR dephosphorylation and promotes invadopodium maturation by blocking PTP1B-dependent cortactin dephosphorylation, while Mena11a suppresses actin polymerization and protrusion; isoform switching is regulated by splicing factors ESRP1, PTBP1, and RBFOX2 in response to EGF, TGF-β/hypoxia, and matrix stiffness signals. Mena is also a transcriptional target of Wnt/β-catenin via TCF4 and of Notch1, and is phosphorylated by c-Abl at Tyr-296 in a manner facilitated by Abi-1."},"narrative":{"mechanistic_narrative":"ENAH (Mena) is an actin-regulatory scaffold of the Ena/VASP family that couples membrane receptors and adhesion structures to actin filament assembly, promoting filopodia, lamellipodia, focal-adhesion dynamics, and cell motility [PMID:8861907, PMID:10069337]. Its modular architecture underlies this scaffolding role: the EVH1 domain recognizes proline-rich SLiMs (FPPPP/PPLP-type motifs) in partners including the FE65 WW domain, Xin, the IRSp53 SH3 domain, and Tes LIM3, with a diverged EVH1 pocket and noncanonical secondary site conferring paralog-specific, often bivalent recognition of extended ligands [PMID:8861907, PMID:9407065, PMID:11696321, PMID:16631741, PMID:18158903, PMID:35076015]; a central proline-rich region binds the G-actin-binding profilin I/IIa, and profilin is required for Mena/VASP function at the leading edge where it sets the balance between filopodia and Arp2/3-driven lamellipodia [PMID:8861907, PMID:10069337, PMID:32470361]. Mena is targeted to distinct sites by dedicated partners—zyxin recruits it to focal adhesions, Myosin X transports it to filopodial tips, and it engages α5β1 integrin via LERER repeats to drive outside-in signaling, FAK/paxillin phosphorylation, and fibronectin fibrillogenesis [PMID:15158464, PMID:16505170, PMID:22908313]. Mena and VASP are functionally redundant in actin-dependent neural development, and combined loss causes neurulation, craniofacial, and CNS/PNS axon-tract defects [PMID:15371503]; in heart, Mena localizes to intercalated discs and Z-discs and is required for connexin-43 organization and normal cardiac conduction [PMID:23937664, PMID:21335464]. Beyond direct cytoskeletal roles, Mena nucleates regulatory complexes—it constitutively binds PTP1B and SHIP2 to provide negative feedback on EGFR signaling, links Cdc42–IRSp53 to filopodium initiation, anchors gephyrin–profilin at inhibitory synapses, and forms an HnrnpK/PCBP1 ribonucleoprotein that controls BDNF-stimulated local translation of dyrk1a in axons [PMID:11696321, PMID:12967995, PMID:26337385, PMID:27597754, PMID:28735747]. Alternative splicing diversifies its output: the MenaINV isoform sensitizes carcinoma cells to EGF by impairing PTP1B recruitment to EGFR and to invadopodia, promoting invadopodium maturation, intravasation, and metastasis, whereas Mena11a suppresses actin polymerization and protrusion; isoform choice is governed by ESRP1, PTBP1, and RBFOX2 downstream of EGF, Notch1, TGF-β/hypoxia, and matrix-stiffness/FAK signaling [PMID:19081071, PMID:21670198, PMID:26337385, PMID:27824079, PMID:27901093, PMID:27748415, PMID:31075540, PMID:33089214, PMID:37027295]. MENA is itself a transcriptional target of Wnt/β-catenin–TCF4 and Notch1, and is phosphorylated by c-Abl at Tyr-296 in an Abi-1-facilitated manner [PMID:12672821, PMID:22615875, PMID:27901093].","teleology":[{"year":1996,"claim":"Established that Mena is an actin-assembly protein, defining its EVH1 domain as a proline-rich-motif reader and linking it to profilin and microfilament formation.","evidence":"Affinity chromatography, immunofluorescence localization, and overexpression in fibroblasts producing F-actin-rich outgrowths","pmids":["8861907"],"confidence":"High","gaps":["Did not define the EVH2/actin-binding contribution biochemically","No in vivo loss-of-function at this stage"]},{"year":1997,"claim":"Identified the FE65 WW domain as a direct PPLP-motif partner of Mena, extending the proline-rich interactome beyond actin machinery.","evidence":"Affinity purification from brain, SPOTS peptide competition, co-IP from COS cells","pmids":["9407065"],"confidence":"High","gaps":["Functional consequence of the Mena–FE65 complex not established","No structural detail of the interaction"]},{"year":1999,"claim":"Placed Mena in the profilin actin pathway genetically and localized it to growth-cone filopodial tips, connecting molecular binding to neural development.","evidence":"Direct binding assay plus Mena-/- x Profilin I+/- double-mutant mouse genetics and neuronal immunofluorescence","pmids":["10069337"],"confidence":"High","gaps":["Whether Mena acts strictly upstream of or parallel to profilin unresolved","Mechanism of filopodial tip targeting not defined here"]},{"year":2003,"claim":"Defined how Mena is post-translationally and combinatorially regulated, identifying Abi-1-facilitated c-Abl phosphorylation at Tyr-296 and gephyrin competition for the profilin site at synapses.","evidence":"Yeast two-hybrid, co-IP, site-directed mutagenesis (Abi-1/Abl); co-precipitation and competition assays from brain (gephyrin)","pmids":["12672821","12967995"],"confidence":"High","gaps":["Functional output of Tyr-296 phosphorylation on actin assembly not measured","Gephyrin interaction lacks reciprocal structural validation"]},{"year":2004,"claim":"Resolved how Mena reaches its sites of action and demonstrated Mena/VASP redundancy in development, plus paralog-selective EVH1 ligand engagement.","evidence":"Co-IP and live co-movement imaging (Myosin X transport); Mena/VASP double-KO mouse phenotyping; designed miniature-protein binding and Xenopus motility assay","pmids":["15158464","15371503","14709031"],"confidence":"High","gaps":["Quantitative contribution of Myosin X transport versus diffusion not resolved","Paralog-specific endogenous ligands not yet identified"]},{"year":2006,"claim":"Identified site-specific recruitment factors, showing zyxin is required for Mena focal-adhesion targeting and Xin links Mena to cardiac intercalated discs.","evidence":"Zyxin knockout with localization/motility readouts; EVH1 direct binding and cardiomyocyte co-localization (Xin)","pmids":["16505170","16631741"],"confidence":"High","gaps":["Whether zyxin recruits Mena directly versus via intermediates not fully separated","Functional role of Xin isoform-selective binding unclear"]},{"year":2007,"claim":"Provided structural and functional logic for EVH1-mediated regulation and connected Mena to filopodia initiation downstream of Cdc42/IRSp53 with disease relevance.","evidence":"Crystal structure of Tes-LIM3:EVH1 with mutagenesis and migration assays; synaptopodin binding to IRSp53 with FP4-Mito inhibitor in an in vivo proteinuria model","pmids":["18158903","17569780"],"confidence":"High","gaps":["Endogenous regulation of Mena displacement by Tes in vivo not quantified","How IRSp53:Mena synergy nucleates filaments mechanistically unresolved"]},{"year":2008,"claim":"Defined alternative splicing as a functional switch, establishing MenaINV as a pro-invasive, pro-metastatic isoform sensitizing cells to EGF.","evidence":"Forced isoform expression with in vitro invasion and in vivo xenograft metastasis assays","pmids":["19081071"],"confidence":"High","gaps":["Molecular basis of EGF sensitization not yet known at this stage","Splicing regulators driving the switch unidentified here"]},{"year":2011,"claim":"Connected Mena isoforms to paracrine tumor-cell behavior and uncovered required cardiac functions in connexin-43 organization and conduction.","evidence":"Intravital imaging and paracrine co-culture (MenaINV/Mena11a); Mena KO echocardiography/ECG/EM and Mena–Rac1 co-IP with Cx43 readouts","pmids":["21670198","21335464","24186093"],"confidence":"High","gaps":["Direct molecular targets coupling Mena to Cx43 trafficking not defined","Whether cardiac phenotype is cell-autonomous unresolved"]},{"year":2012,"claim":"Established Mena as a direct α5β1 integrin effector for outside-in signaling and identified Wnt/β-catenin–TCF4 as a transcriptional driver of MENA.","evidence":"Direct binding/domain mapping to α5 LERER repeats with fibrillogenesis assays; luciferase reporter, ChIP, and TCF4 overexpression/DN","pmids":["22908313","22615875","23129656"],"confidence":"High","gaps":["Structural basis of LERER-repeat recognition not solved","Interplay between transcriptional and splicing control not integrated"]},{"year":2013,"claim":"Extended Mena function to membrane trafficking and cardiac actin networks, linking it to EGFR clathrin-mediated endocytosis via lamellipodin and to αII-spectrin at Z-/intercalated discs.","evidence":"Co-IP, EGFR endocytosis assays, clathrin-pit live imaging; cardiac double-KO with echocardiography/ECG","pmids":["24076656","23937664"],"confidence":"High","gaps":["Whether Mena's endocytic role requires its actin activity not fully separated","Direct spectrin-binding interface not mapped"]},{"year":2015,"claim":"Resolved the molecular mechanism of MenaINV's EGF sensitization through a Mena–PTP1B/SHIP2 negative feedback module on EGFR, and tied Mena to actin-dependent Golgi linking.","evidence":"Co-IPs of Mena–PTP1B/SHIP2/EGFR complexes with phospho-EGFR readouts; in vitro GRASP65 oligomerization and Mena-depletion Golgi morphology assays","pmids":["26337385","26538023"],"confidence":"High","gaps":["Structural basis of PTP1B/SHIP2 association with Mena not defined","Golgi role rests on single-lab reconstitution"]},{"year":2016,"claim":"Mechanistically dissected isoform-specific behavior—MenaINV blocks PTP1B-dependent cortactin dephosphorylation to mature invadopodia, SHIP2 recruits Mena to invadopodia, Mena11a suppresses protrusion, Notch1 drives MenaINV, and MenaINV confers taxane resistance.","evidence":"Live invadopodium imaging, phospho-cortactin/PTP1B localization, reciprocal SHIP2 co-IP with metastasis model, isoform siRNA/TIRF, Notch1 KD epistasis, microtubule stability/MEK inhibitor rescue","pmids":["27824079","27597754","27748415","27901093","27811011"],"confidence":"Medium","gaps":["PTP1B displacement at invadopodia not biochemically reconstituted","Phospho-site in exon 11a governing Mena11a function not fully characterized"]},{"year":2017,"claim":"Revealed a non-canonical role for Mena as part of an HnrnpK/PCBP1 ribonucleoprotein controlling activity-dependent local mRNA translation in axons.","evidence":"RNA-IP, co-IP with RBPs, polysome assays, BDNF-stimulated reporter translation, RNA-seq of Mena-associated mRNAs","pmids":["28735747"],"confidence":"High","gaps":["Whether RNA regulation requires Mena's actin activity unknown","Direct RNA contacts of Mena versus partner RBPs not separated"]},{"year":2019,"claim":"Identified PTBP1 and a TES-mediated mechanism as regulators of MENA function, controlling exon-11a skipping and Mena–lamellipodin complex formation.","evidence":"RNA pulldown with mutation analysis and KD/rescue invasion assays (PTBP1); IP-MS and co-IP epistasis (TES–Mena–Lpd)","pmids":["31075540","30728082"],"confidence":"Medium","gaps":["Combinatorial control with ESRP1/RBFOX2 not integrated","TES disruption of Mena–Lpd not structurally defined"]},{"year":2020,"claim":"Defined profilin 1 as essential for Mena/VASP leading-edge function and showed PFN1 levels set the filopodia/lamellipodia balance.","evidence":"PFN1 CRISPR/siRNA KO, leading-edge IF, actin polymerization and filopodia/lamellipodia live imaging","pmids":["32470361"],"confidence":"Medium","gaps":["Quantitative thresholds in vivo unknown","Single-lab dataset"]},{"year":2022,"claim":"Provided a structural and thermodynamic framework for ENAH EVH1 specificity, defining a diverged pocket and a secondary site enabling high-affinity bivalent SLiM engagement (e.g., PCARE).","evidence":"Proteomic peptide screen, structural analysis, ITC, mutagenesis","pmids":["35076015"],"confidence":"High","gaps":["Cellular relevance of newly identified binders not tested","Full-length context of bivalent engagement not resolved"]},{"year":2023,"claim":"Linked mechanical input to MENA biology, showing matrix stiffness raises MENA expression via FAK and lowers ESRP1 to shift splicing toward pro-intravasation isoforms.","evidence":"Tunable hydrogel 3D culture, FAK inhibition, ESRP1 manipulation with isoform assays, in vivo intravasation model, TCGA analysis","pmids":["37027295"],"confidence":"Medium","gaps":["Direct transcriptional link from FAK to MENA not defined","Single-lab mechanistic dissection"]},{"year":null,"claim":"How the diverse Mena complexes (integrin, PTP1B/SHIP2, RNP, gephyrin, Golgi) are spatially and temporally coordinated within a single cell, and how phosphorylation and splicing jointly tune these outputs, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model integrating splicing, phosphorylation, and partner choice","Structures of most full-length Mena complexes lacking","In vivo isoform-specific knock-in phenotypes incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,1,30]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,9,16,21,27]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[28]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[21,23]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,1,30]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[9,16,20]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[22]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[21,28]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[16,21,3]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,7]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[14,15,27]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[28]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[19,22]}],"complexes":["Mena–PTP1B–SHIP2/EGFR complex","Cdc42–IRSp53–Mena complex","HnrnpK/PCBP1 ribonucleoprotein","gephyrin–profilin–Mena/VASP complex"],"partners":["PFN1","EVL","VASP","ITGA5","PTPN1","INPPL1","ZYXIN","TES"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8N8S7","full_name":"Protein enabled homolog","aliases":[],"length_aa":591,"mass_kda":66.5,"function":"Ena/VASP proteins are actin-associated proteins involved in a range of processes dependent on cytoskeleton remodeling and cell polarity such as axon guidance and lamellipodial and filopodial dynamics in migrating cells. ENAH induces the formation of F-actin rich outgrowths in fibroblasts. Acts synergistically with BAIAP2-alpha and downstream of NTN1 to promote filipodia formation (By similarity)","subcellular_location":"Cytoplasm; Cytoplasm, cytoskeleton; Cell projection, lamellipodium; Cell projection, filopodium; Synapse; Cell junction, focal adhesion","url":"https://www.uniprot.org/uniprotkb/Q8N8S7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ENAH","classification":"Not Classified","n_dependent_lines":19,"n_total_lines":1165,"dependency_fraction":0.01630901287553648},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"ACTG1","stoichiometry":10.0},{"gene":"NCKAP1","stoichiometry":10.0},{"gene":"ZYX","stoichiometry":4.0},{"gene":"ACTB","stoichiometry":0.2},{"gene":"ATG13","stoichiometry":0.2},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"EMC9","stoichiometry":0.2},{"gene":"VASP","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ENAH","total_profiled":1310},"omim":[{"mim_id":"616912","title":"ENAH/VASP-LIKE PROTEIN; EVL","url":"https://www.omim.org/entry/616912"},{"mim_id":"614790","title":"WT1-INTERACTING PROTEIN; WTIP","url":"https://www.omim.org/entry/614790"},{"mim_id":"612960","title":"EPITHELIAL SPLICING REGULATORY PROTEIN 2; ESRP2","url":"https://www.omim.org/entry/612960"},{"mim_id":"612959","title":"EPITHELIAL SPLICING REGULATORY PROTEIN 1; ESRP1","url":"https://www.omim.org/entry/612959"},{"mim_id":"611282","title":"DYNAMIN-BINDING PROTEIN; DNMBP","url":"https://www.omim.org/entry/611282"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Plasma membrane","reliability":"Enhanced"},{"location":"Focal adhesion sites","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ENAH"},"hgnc":{"alias_symbol":["FLJ10773","NDPP1","MENA"],"prev_symbol":[]},"alphafold":{"accession":"Q8N8S7","domains":[{"cath_id":"2.30.29.30","chopping":"4-113","consensus_level":"medium","plddt":95.2322,"start":4,"end":113}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N8S7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N8S7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N8S7-F1-predicted_aligned_error_v6.png","plddt_mean":70.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ENAH","jax_strain_url":"https://www.jax.org/strain/search?query=ENAH"},"sequence":{"accession":"Q8N8S7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N8S7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N8S7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N8S7"}},"corpus_meta":[{"pmid":"8861907","id":"PMC_8861907","title":"Mena, a relative of 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Mena is concentrated at the tips of growth cone filopodia in primary neurons and is required for commissure formation.\",\n      \"method\": \"Direct binding assay, genetic double-mutant analysis (Mena-/- x Profilin I+/-), immunofluorescence in primary neurons\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic epistasis plus direct binding assay, replicated across labs\",\n      \"pmids\": [\"10069337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The FE65 WW domain binds directly to proline-rich sequences in Mena containing a PPLP core motif; the Mena–FE65 complex forms in vivo as demonstrated by co-immunoprecipitation from COS cell extracts.\",\n      \"method\": \"Affinity purification from mouse brain lysates, SPOTS peptide competition assay, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (affinity purification, peptide mapping, co-IP), direct binding established\",\n      \"pmids\": [\"9407065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Cdc42 interacts with IRSp53 at a partial CRIB motif, relieving an autoinhibitory intramolecular interaction, which allows the IRSp53 SH3 domain to recruit Mena; the resulting IRSp53:Mena complex acts synergistically to initiate actin filament assembly into filopodia.\",\n      \"method\": \"Affinity chromatography (SH3 domain pulldown to identify Mena), overexpression epistasis, dominant-negative fragment inhibition assay\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — affinity chromatography identification plus functional epistasis with dominant-negative fragments, replicated in subsequent studies\",\n      \"pmids\": [\"11696321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Mena binds directly to profilin I and profilin IIa and to members of the Mena/VASP family; gephyrin co-precipitates with profilin and Mena/VASP from brain tissue, with interaction requiring the E-domain of gephyrin (not the proline-rich domain), and gephyrin competes with G-actin and phospholipids for the profilin binding site.\",\n      \"method\": \"Co-precipitation from tissue and cell lysates, domain mapping, competition assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical methods in single lab, no reciprocal structural validation\",\n      \"pmids\": [\"12967995\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Abl interactor 1 (Abi-1) binds to Mena via the EVH1 domain of Mena and the polyproline region of Abi-1, and dramatically promotes c-Abl-mediated tyrosine phosphorylation of Mena specifically at Tyr-296.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation in mammalian cells, site-directed mutagenesis (Tyr296 mutant)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis identifying specific phosphorylation site combined with co-IP and two-hybrid, single lab but three orthogonal methods\",\n      \"pmids\": [\"12672821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Myosin X (M10) binds to Mena/VASP and co-localizes with it at filopodial tips; live-cell imaging shows EGFP-M10 and RFP-VASP moving together from the base to the tip of filopodia, and the amount of VASP at the tip is proportional to M10 levels, demonstrating that Myosin X transports Mena/VASP to filopodial tips.\",\n      \"method\": \"Co-immunoprecipitation, immunocytochemistry, live fluorescence microscopy (co-movement assay)\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP plus live imaging showing co-movement, single lab\",\n      \"pmids\": [\"15158464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Genetic deletion of both Mena and VASP causes perinatal lethality with defects in neurulation, craniofacial structures, and CNS/PNS fiber tracts, demonstrating functional redundancy between Mena and VASP in actin-dependent developmental processes.\",\n      \"method\": \"Double-knockout mouse genetics with developmental phenotype analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic double-KO with defined developmental phenotypes, complements single-KO data from prior work\",\n      \"pmids\": [\"15371503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The EVH1 domain of Mena (Mena1-112) displays paralog-specific binding: a miniature protein mimicking the ActA PPII helix binds Mena EVH1 with high affinity and discriminates between Mena, VASP, and Evl EVH1 domains; this miniature protein competed with ActA in Xenopus extracts and decreased L. monocytogenes actin-based motility.\",\n      \"method\": \"In vitro binding assay with designed miniature protein, Xenopus egg extract motility assay\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with designed ligand plus functional cell-extract assay demonstrating paralog specificity\",\n      \"pmids\": [\"14709031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Zyxin is required for proper localization of Ena/VASP proteins (including Mena) to focal adhesions; zyxin-null fibroblasts show severely reduced Mena/VASP accumulation at focal adhesions and exhibit deficits in actin stress fiber remodeling and enhanced cell motility.\",\n      \"method\": \"Homologous recombination knockout, immunofluorescence localization, cell motility assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic knockout with multiple phenotypic readouts establishing zyxin as required for Mena focal-adhesion targeting\",\n      \"pmids\": [\"16505170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Xin (CMYA1) directly binds the EVH1 domain of Mena and VASP, and in adult heart, Xin and Mena/VASP co-localize with filamin c at intercalated discs; different Xin isoforms produced by intraexonic splicing associate differentially with Mena/VASP.\",\n      \"method\": \"Direct binding assay (EVH1 domain), immunofluorescence co-localization in cardiomyocytes\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct binding plus co-localization, single lab\",\n      \"pmids\": [\"16631741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The LIM3 domain of Tes binds specifically to the EVH1 domain of Mena (but not VASP or Evl), occludes the canonical FPPPP-binding site, and competes with FPPPP-containing proteins; crystal structure of the LIM3:EVH1 complex reveals the molecular basis of specificity. LIM3 expression displaces Mena from the leading edge and focal adhesions and regulates cell migration through a Mena-dependent mechanism.\",\n      \"method\": \"Crystal structure determination, in vitro binding assay, structure-based gain-of-function mutagenesis, cell-based localization and migration assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus functional cell assay, all in single rigorous study\",\n      \"pmids\": [\"18158903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Synaptopodin directly binds IRSp53 and blocks the binding of Cdc42 and Mena to IRSp53, thereby suppressing Cdc42:IRSp53:Mena-initiated filopodia formation. A Mena inhibitor (FP4-Mito) suppressed aberrant filopodia in synaptopodin-knockdown podocytes and protected mice against LPS-induced proteinuria.\",\n      \"method\": \"Direct binding assay, siRNA knockdown with filopodia quantification, in vivo LPS-proteinuria model with FP4-Mito inhibitor\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding assay plus in vivo functional rescue, multiple methods\",\n      \"pmids\": [\"17569780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"EGF treatment upregulates hMena and its splice variant hMena+11a and specifically increases phosphorylation of the hMena+11a isoform, which in turn leads to increased p42/44 MAPK activation and cell proliferation; hMena knockdown reduces MAPK phosphorylation and EGF-driven proliferative response.\",\n      \"method\": \"Isoform-specific cloning, Western blot phosphorylation analysis, siRNA knockdown with MAPK/proliferation readout\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, multiple readouts but no identification of the kinase writing the phosphorylation\",\n      \"pmids\": [\"17363586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The Mena invasion isoform MenaINV sensitizes carcinoma cells to EGF-induced membrane protrusion and matrix degradation, and increases lung metastasis; MenaINV is more effective than canonical Mena in driving metastases and EGF-dependent invasion in vivo and in vitro.\",\n      \"method\": \"Forced expression, in vitro invasion assay, in vivo mouse xenograft metastasis model, in vivo invasion assay\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo and in vitro assays with multiple isoforms and xenograft models, replicated by subsequent work\",\n      \"pmids\": [\"19081071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MenaINV promotes coordinated streaming motility, transendothelial migration, and intravasation dependent on a macrophage-tumor cell paracrine loop. Mena11a expression decreases CSF1 expression and ablates paracrine-mediated invasion and intravasation.\",\n      \"method\": \"Intravital multiphoton microscopy, transendothelial migration assay, in vivo intravasation quantification, paracrine co-culture experiments\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple in vivo and in vitro assays with mechanistic dissection of paracrine dependency\",\n      \"pmids\": [\"21670198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Mena directly binds the carboxy-terminal portion of the α5 integrin cytoplasmic tail via a 91-residue region containing 13 'LERER' repeats; the Mena–α5β1 complex is required for 'outside-in' α5β1 functions including FAK and paxillin phosphorylation, fibrillar adhesion formation, fibronectin fibrillogenesis, and control of cell migration speed.\",\n      \"method\": \"Direct binding assay (pull-down with defined domain), co-immunoprecipitation, mutagenesis mapping, fibronectin fibrillogenesis assay, fibrillar adhesion immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct binding with domain mapping plus multiple functional readouts, single comprehensive study\",\n      \"pmids\": [\"22908313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MENA is a transcriptional target of the Wnt/β-catenin pathway; TCF4 binding sites in the MENA promoter are functional as shown by luciferase reporter assays, β-catenin/TCF4 overexpression increases MENA mRNA, and chromatin immunoprecipitation shows direct interaction of β-catenin with the MENA promoter in cell lines and mouse tissues.\",\n      \"method\": \"Luciferase reporter assay, chromatin immunoprecipitation (ChIP), overexpression and dominant-negative TCF4\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus luciferase reporter plus genetic overexpression/DN, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"22615875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"hMENA splicing is regulated by ESRP1; forced expression of ESRP1 in invasive mesenchymal breast cancer cells causes re-expression of hMENA(11a), a mesenchymal-to-epithelial transition-like phenotypic switch, and decreased cell invasion.\",\n      \"method\": \"ESRP1 forced expression with isoform-specific RT-PCR, invasion assay, cytoskeletal architecture analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional rescue experiment with defined splicing regulator, single lab\",\n      \"pmids\": [\"23129656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Lamellipodin (Lpd) forms a complex with the EGFR and with Mena; knockdown of Lpd or Mena impairs clathrin-mediated endocytosis (CME) of the EGFR, while Lpd overexpression increases EGFR uptake in an F-actin-dependent manner. Lpd directly interacts with endophilin and localizes to clathrin-coated pits before vesicle scission.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown with EGFR endocytosis assay, live-cell imaging of clathrin-coated pits\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, KD phenotype, and live imaging, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"24076656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Mena and VASP interact with the αII-Spectrin SH3i splice variant specifically at Z-discs and intercalated discs in cardiomyocytes; Mena/VASP double-deficiency disrupts β-actin networks at these structures and causes dilated cardiomyopathy with conduction abnormalities.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence fractionation, double-knockout mouse model with echocardiography and ECG\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic DKO with cardiac phenotype plus biochemical interaction data\",\n      \"pmids\": [\"23937664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Mena constitutively associates with the tyrosine phosphatase PTP1B and mediates a negative feedback mechanism on EGFR signaling: upon EGF stimulation, Mena–PTP1B complexes are recruited to the EGFR, causing receptor dephosphorylation. Mena also interacts with SHIP2, which is required for PTP1B recruitment to the EGFR. MenaINV expression impairs PTP1B recruitment to the EGFR, explaining MenaINV-mediated sensitization to EGF.\",\n      \"method\": \"Co-immunoprecipitation (Mena–PTP1B, Mena–SHIP2, EGFR complexes), siRNA knockdown with phospho-EGFR readout, motility assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple co-IPs establishing the complex, mechanistic KD experiments with defined molecular readout\",\n      \"pmids\": [\"26337385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Mena interacts with GRASP65 on Golgi membranes; depletion of Mena or disruption of actin polymerization causes Golgi fragmentation. In vitro, Mena and microfilaments enhance GRASP65 oligomerization and Golgi membrane fusion, coupling actin polymerization to Golgi ribbon linking.\",\n      \"method\": \"Biochemical co-purification, in vitro GRASP65 oligomerization assay, Mena depletion with Golgi morphology readout\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro reconstitution plus cell depletion, single lab\",\n      \"pmids\": [\"26538023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MenaINV is recruited to invadopodium precursors shortly after assembly and promotes phosphorylation of cortactin tyrosine 421; MenaINV reduces localization of the phosphatase PTP1B to the invadopodium, thereby inhibiting cortactin dephosphorylation and promoting invadopodium maturation.\",\n      \"method\": \"Fluorescence live imaging of invadopodium assembly, phospho-cortactin immunofluorescence, PTP1B localization assay by imaging, isoform overexpression\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — imaging-based mechanistic dissection in single lab, no direct biochemical reconstitution of PTP1B displacement\",\n      \"pmids\": [\"27824079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MenaINV expression alters the ratio of dynamic to stable microtubule populations in paclitaxel-treated cells and increases MAPK/ERK signaling; co-treatment with MEK inhibitor restores paclitaxel sensitivity by driving microtubule stabilization, establishing a mechanism for MENA-mediated taxane resistance.\",\n      \"method\": \"Microtubule stability assay (tubulin fractionation), ERK phosphorylation Western blot, MEK inhibitor co-treatment rescue experiment\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — mechanistic pharmacological rescue experiment, single lab, multiple readouts\",\n      \"pmids\": [\"27811011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Macrophage contact with tumor cells activates Notch1 signaling, which upregulates MenaINV transcription; Notch1 and MenaINV are both required for macrophage-induced invadopodium formation and tumor cell transendothelial migration; Notch pathway inhibition blocks tumor cell dissemination in vivo.\",\n      \"method\": \"Notch1 siRNA knockdown with invadopodium and transendothelial migration readouts, MENA promoter transcription assay, in vivo tumor dissemination assay with Notch inhibitor\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional epistasis (Notch1→MenaINV→invadopodium), in vitro and in vivo, single lab\",\n      \"pmids\": [\"27901093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The Mena11a isoform decreases actin polymerization and growth-factor-stimulated lamellipodia protrusion, slows mesenchymal-like cell motility, and its depletion in epithelial cells perturbs cell:cell junctions. A phosphorylation site within the 11a exon is required for some Mena11a-specific functions.\",\n      \"method\": \"Isoform-specific siRNA, actin polymerization assay, membrane protrusion TIRF imaging, cell motility tracking, phospho-site mutagenesis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods including mutagenesis of phosphorylation site, single lab\",\n      \"pmids\": [\"27748415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SHIP2 directly interacts with Mena (but not VASP) via specific biochemical interactions and recruits Mena to invadopodia; disruption of the SHIP2–Mena interaction reduces ECM degradation, in vitro invasion, and in vivo metastasis.\",\n      \"method\": \"Co-immunoprecipitation, structure-function analysis, invadopodium degradation assay, in vivo metastasis model\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP with domain mapping plus in vitro functional assay plus in vivo metastasis\",\n      \"pmids\": [\"27597754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Mena forms a ribonucleoprotein complex with RNA-binding proteins HnrnpK and PCBP1 in developing neurons, and this complex regulates local translation of specific mRNAs including dyrk1a in axons; Mena is required for BDNF-stimulated local translation of dyrk1a.\",\n      \"method\": \"RNA immunoprecipitation, co-immunoprecipitation with RBPs, polysome/translation assay, BDNF stimulation with reporter translation assay, RNA-seq of Mena-associated mRNAs\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP of RNP complex plus functional translation assay with defined mRNA substrate plus BDNF stimulus, multiple orthogonal methods\",\n      \"pmids\": [\"28735747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PTBP1 binds to polypyrimidine sequences on introns flanking MENA exon 11a (confirmed by RNA pulldown and mutation analysis) and promotes exon 11a skipping; PTBP1 knockdown inhibits MenaΔ11a production and reduces lung cancer cell migration and invasion, while overexpressed MenaΔ11a rescues PTBP1-driven invasion.\",\n      \"method\": \"RNA pulldown assay, mutational analysis of binding sequences, shRNA knockdown with isoform-specific RT-PCR, invasion and migration assays\",\n      \"journal\": \"Biochimica et biophysica acta. Gene regulatory mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA-protein binding assay with mutation validation plus functional epistasis, single lab\",\n      \"pmids\": [\"31075540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Mena/VASP-based filament assembly at the leading edge requires profilin 1 (PFN1); in PFN1 knockout cells, Mena/VASP is non-functional at the leading edge and Arp2/3 no longer localizes there; varying PFN1 concentrations dictate the balance between Mena/VASP-driven filopodia and Arp2/3-driven lamellipodia.\",\n      \"method\": \"PFN1 CRISPR/siRNA knockout, leading-edge immunofluorescence, actin polymerization assay, live-cell imaging of filopodia/lamellipodia\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined cellular phenotype and mechanistic dissection, single lab\",\n      \"pmids\": [\"32470361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Hypoxia-driven TGF-β signaling transcriptionally represses ESRP1 via SLUG and RBFOX2, leading to skipping of MENA exon 11a and production of the pro-metastatic hMENAΔ11a isoform; exosomal TGF-β contributes to this signaling under hypoxia.\",\n      \"method\": \"TGF-β pathway manipulation, ESRP1 knockdown/overexpression with isoform-specific RT-PCR, ChIP for SLUG at ESRP1 promoter, exosome co-culture experiments\",\n      \"journal\": \"NAR cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional splicing rescue experiments, single lab\",\n      \"pmids\": [\"33089214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A proteomic screen of 36-residue proteome-derived peptides against the ENAH EVH1 domain revealed that a diverged pocket on ENAH EVH1 (relative to other Ena/VASP paralogs) recognizes extended SLiMs with flanking prolines; many high-affinity binders use a noncanonical secondary site on EVH1 when harboring two proline-rich motifs; PCARE uses a 23-residue region to achieve the highest known affinity for ENAH EVH1. These interactions display thermodynamic signatures consistent with bivalent engagement.\",\n      \"method\": \"Proteomic peptide screen, structural analysis of EVH1 domain interactions, isothermal titration calorimetry, mutagenesis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structural mapping, thermodynamic analysis, and mutagenesis in single comprehensive study\",\n      \"pmids\": [\"35076015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Matrix stiffness increases MENA expression via focal adhesion kinase (FAK) activity and promotes intravasation; stiffness also decreases ESRP1 expression, triggering alternative splicing of MENA to reduce MENA11a, which further enhances contractility and intravasation.\",\n      \"method\": \"Tunable hydrogel 3D culture, FAK inhibition, ESRP1 knockdown/overexpression with isoform-specific assays, mouse mammary intravasation model, TCGA expression analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro mechanistic dissection plus in vivo model, single lab\",\n      \"pmids\": [\"37027295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Mena associates with active Rac1 in cardiomyocytes; Mena knockdown increases Rac1 activity and alters connexin 43 (Cx43) expression, localization, and trafficking at the intercalated disc, resulting in faster intercellular communication; constitutively active Rac1 overexpression increases Mena expression and causes lateral redistribution of Cx43.\",\n      \"method\": \"Co-immunoprecipitation of Mena–Rac1, Rac1 activity pull-down assay, RNAi knockdown with Cx43 localization and dye transfer assays, constitutively active Rac1 mouse model\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional epistasis with Rac1 activity assay, single lab\",\n      \"pmids\": [\"24186093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Genetic deletion of Mena in adult mice causes cardiac dysfunction with reduced fractional shortening, prolonged PR and QRS intervals, disrupted intercalated disc ultrastructure, mislocalization of connexin 43 to lateral cardiomyocyte borders, increased Cx43 expression, and reduced vinculin.\",\n      \"method\": \"Mena knockout mouse model, echocardiography, ECG, optical mapping, electron microscopy, immunofluorescence\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with multiple orthogonal cardiac phenotype readouts\",\n      \"pmids\": [\"21335464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MENA knockdown in hepatocellular carcinoma cells decreases RhoA activity (measured by pull-down assay), reduces filopodia and stress fibers, and suppresses migration and invasion; ROCK inhibition diminishes the difference between MENA knockdown and control cells, placing MENA upstream of RhoA–ROCK in promoting HCC motility.\",\n      \"method\": \"shRNA knockdown, RhoA activity pull-down assay, ROCK inhibitor epistasis, transwell migration and invasion assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pull-down activity assay plus pharmacological epistasis, single lab\",\n      \"pmids\": [\"24859350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A thioredoxin-fold protein Sh3bgr specifically localizes to the Z-line in mature sarcomeres and regulates localization of Enah for sarcomere formation; morpholino knockdown of sh3bgr in Xenopus disrupts sarcomere formation and Enah localization, while Sh3bgr overexpression causes abnormal sarcomere assembly.\",\n      \"method\": \"Morpholino knockdown in Xenopus, rescue experiments, immunofluorescence localization of Enah\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function plus localization assay in Xenopus model, single lab\",\n      \"pmids\": [\"26116879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TES interacts with Mena (identified by immunoprecipitation-based mass spectrometry) and inhibits the interaction of Mena with Lamellipodin (Lpd); TES suppresses GC cell migration and invasion in a Mena-dependent fashion.\",\n      \"method\": \"Immunoprecipitation–mass spectrometry, co-IP to map TES–Mena–Lpd complex, siRNA epistasis (TES effect abolished by Mena knockdown)\",\n      \"journal\": \"Cancer communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — IP-MS identification plus functional epistasis, single lab\",\n      \"pmids\": [\"30728082\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ENAH/Mena is an actin-regulatory scaffold protein of the Ena/VASP family that uses its EVH1 domain to bind FPPPP and related proline-rich motifs in cytoskeletal proteins (zyxin, lamellipodin, Xin, vinculin), its central proline-rich region to engage profilin, SH3 domains, and the FE65 WW domain, and its EVH2 domain for F-actin and G-actin interactions; it is targeted to focal adhesions, lamellipodia tips, filopodial tips (via Myosin X transport), and invadopodia, where it antagonizes barbed-end capping to promote actin polymerization and cell motility. Mena forms regulated complexes with α5β1 integrin (via LERER repeats), PTP1B/SHIP2 (attenuating EGFR signaling), IRSp53 downstream of Cdc42 (initiating filopodia), the gephyrin scaffold (linking inhibitory synapses to microfilaments), and an hnRNP complex (controlling local mRNA translation in axons). Alternative splicing produces functionally distinct isoforms: MenaINV sensitizes cells to EGF by impairing PTP1B-mediated EGFR dephosphorylation and promotes invadopodium maturation by blocking PTP1B-dependent cortactin dephosphorylation, while Mena11a suppresses actin polymerization and protrusion; isoform switching is regulated by splicing factors ESRP1, PTBP1, and RBFOX2 in response to EGF, TGF-β/hypoxia, and matrix stiffness signals. Mena is also a transcriptional target of Wnt/β-catenin via TCF4 and of Notch1, and is phosphorylated by c-Abl at Tyr-296 in a manner facilitated by Abi-1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ENAH (Mena) is an actin-regulatory scaffold of the Ena/VASP family that couples membrane receptors and adhesion structures to actin filament assembly, promoting filopodia, lamellipodia, focal-adhesion dynamics, and cell motility [#0, #1]. Its modular architecture underlies this scaffolding role: the EVH1 domain recognizes proline-rich SLiMs (FPPPP/PPLP-type motifs) in partners including the FE65 WW domain, Xin, the IRSp53 SH3 domain, and Tes LIM3, with a diverged EVH1 pocket and noncanonical secondary site conferring paralog-specific, often bivalent recognition of extended ligands [#0, #2, #3, #10, #11, #32]; a central proline-rich region binds the G-actin-binding profilin I/IIa, and profilin is required for Mena/VASP function at the leading edge where it sets the balance between filopodia and Arp2/3-driven lamellipodia [#0, #1, #30]. Mena is targeted to distinct sites by dedicated partners—zyxin recruits it to focal adhesions, Myosin X transports it to filopodial tips, and it engages α5β1 integrin via LERER repeats to drive outside-in signaling, FAK/paxillin phosphorylation, and fibronectin fibrillogenesis [#6, #9, #16]. Mena and VASP are functionally redundant in actin-dependent neural development, and combined loss causes neurulation, craniofacial, and CNS/PNS axon-tract defects [#7]; in heart, Mena localizes to intercalated discs and Z-discs and is required for connexin-43 organization and normal cardiac conduction [#20, #35]. Beyond direct cytoskeletal roles, Mena nucleates regulatory complexes—it constitutively binds PTP1B and SHIP2 to provide negative feedback on EGFR signaling, links Cdc42–IRSp53 to filopodium initiation, anchors gephyrin–profilin at inhibitory synapses, and forms an HnrnpK/PCBP1 ribonucleoprotein that controls BDNF-stimulated local translation of dyrk1a in axons [#3, #4, #21, #27, #28]. Alternative splicing diversifies its output: the MenaINV isoform sensitizes carcinoma cells to EGF by impairing PTP1B recruitment to EGFR and to invadopodia, promoting invadopodium maturation, intravasation, and metastasis, whereas Mena11a suppresses actin polymerization and protrusion; isoform choice is governed by ESRP1, PTBP1, and RBFOX2 downstream of EGF, Notch1, TGF-β/hypoxia, and matrix-stiffness/FAK signaling [#14, #15, #21, #23, #25, #26, #29, #31, #33]. MENA is itself a transcriptional target of Wnt/β-catenin–TCF4 and Notch1, and is phosphorylated by c-Abl at Tyr-296 in an Abi-1-facilitated manner [#5, #17, #25].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established that Mena is an actin-assembly protein, defining its EVH1 domain as a proline-rich-motif reader and linking it to profilin and microfilament formation.\",\n      \"evidence\": \"Affinity chromatography, immunofluorescence localization, and overexpression in fibroblasts producing F-actin-rich outgrowths\",\n      \"pmids\": [\"8861907\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the EVH2/actin-binding contribution biochemically\", \"No in vivo loss-of-function at this stage\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Identified the FE65 WW domain as a direct PPLP-motif partner of Mena, extending the proline-rich interactome beyond actin machinery.\",\n      \"evidence\": \"Affinity purification from brain, SPOTS peptide competition, co-IP from COS cells\",\n      \"pmids\": [\"9407065\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of the Mena–FE65 complex not established\", \"No structural detail of the interaction\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Placed Mena in the profilin actin pathway genetically and localized it to growth-cone filopodial tips, connecting molecular binding to neural development.\",\n      \"evidence\": \"Direct binding assay plus Mena-/- x Profilin I+/- double-mutant mouse genetics and neuronal immunofluorescence\",\n      \"pmids\": [\"10069337\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Mena acts strictly upstream of or parallel to profilin unresolved\", \"Mechanism of filopodial tip targeting not defined here\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined how Mena is post-translationally and combinatorially regulated, identifying Abi-1-facilitated c-Abl phosphorylation at Tyr-296 and gephyrin competition for the profilin site at synapses.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, site-directed mutagenesis (Abi-1/Abl); co-precipitation and competition assays from brain (gephyrin)\",\n      \"pmids\": [\"12672821\", \"12967995\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional output of Tyr-296 phosphorylation on actin assembly not measured\", \"Gephyrin interaction lacks reciprocal structural validation\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved how Mena reaches its sites of action and demonstrated Mena/VASP redundancy in development, plus paralog-selective EVH1 ligand engagement.\",\n      \"evidence\": \"Co-IP and live co-movement imaging (Myosin X transport); Mena/VASP double-KO mouse phenotyping; designed miniature-protein binding and Xenopus motility assay\",\n      \"pmids\": [\"15158464\", \"15371503\", \"14709031\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of Myosin X transport versus diffusion not resolved\", \"Paralog-specific endogenous ligands not yet identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified site-specific recruitment factors, showing zyxin is required for Mena focal-adhesion targeting and Xin links Mena to cardiac intercalated discs.\",\n      \"evidence\": \"Zyxin knockout with localization/motility readouts; EVH1 direct binding and cardiomyocyte co-localization (Xin)\",\n      \"pmids\": [\"16505170\", \"16631741\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether zyxin recruits Mena directly versus via intermediates not fully separated\", \"Functional role of Xin isoform-selective binding unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Provided structural and functional logic for EVH1-mediated regulation and connected Mena to filopodia initiation downstream of Cdc42/IRSp53 with disease relevance.\",\n      \"evidence\": \"Crystal structure of Tes-LIM3:EVH1 with mutagenesis and migration assays; synaptopodin binding to IRSp53 with FP4-Mito inhibitor in an in vivo proteinuria model\",\n      \"pmids\": [\"18158903\", \"17569780\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous regulation of Mena displacement by Tes in vivo not quantified\", \"How IRSp53:Mena synergy nucleates filaments mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined alternative splicing as a functional switch, establishing MenaINV as a pro-invasive, pro-metastatic isoform sensitizing cells to EGF.\",\n      \"evidence\": \"Forced isoform expression with in vitro invasion and in vivo xenograft metastasis assays\",\n      \"pmids\": [\"19081071\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of EGF sensitization not yet known at this stage\", \"Splicing regulators driving the switch unidentified here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected Mena isoforms to paracrine tumor-cell behavior and uncovered required cardiac functions in connexin-43 organization and conduction.\",\n      \"evidence\": \"Intravital imaging and paracrine co-culture (MenaINV/Mena11a); Mena KO echocardiography/ECG/EM and Mena–Rac1 co-IP with Cx43 readouts\",\n      \"pmids\": [\"21670198\", \"21335464\", \"24186093\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular targets coupling Mena to Cx43 trafficking not defined\", \"Whether cardiac phenotype is cell-autonomous unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established Mena as a direct α5β1 integrin effector for outside-in signaling and identified Wnt/β-catenin–TCF4 as a transcriptional driver of MENA.\",\n      \"evidence\": \"Direct binding/domain mapping to α5 LERER repeats with fibrillogenesis assays; luciferase reporter, ChIP, and TCF4 overexpression/DN\",\n      \"pmids\": [\"22908313\", \"22615875\", \"23129656\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of LERER-repeat recognition not solved\", \"Interplay between transcriptional and splicing control not integrated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended Mena function to membrane trafficking and cardiac actin networks, linking it to EGFR clathrin-mediated endocytosis via lamellipodin and to αII-spectrin at Z-/intercalated discs.\",\n      \"evidence\": \"Co-IP, EGFR endocytosis assays, clathrin-pit live imaging; cardiac double-KO with echocardiography/ECG\",\n      \"pmids\": [\"24076656\", \"23937664\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Mena's endocytic role requires its actin activity not fully separated\", \"Direct spectrin-binding interface not mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved the molecular mechanism of MenaINV's EGF sensitization through a Mena–PTP1B/SHIP2 negative feedback module on EGFR, and tied Mena to actin-dependent Golgi linking.\",\n      \"evidence\": \"Co-IPs of Mena–PTP1B/SHIP2/EGFR complexes with phospho-EGFR readouts; in vitro GRASP65 oligomerization and Mena-depletion Golgi morphology assays\",\n      \"pmids\": [\"26337385\", \"26538023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of PTP1B/SHIP2 association with Mena not defined\", \"Golgi role rests on single-lab reconstitution\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Mechanistically dissected isoform-specific behavior—MenaINV blocks PTP1B-dependent cortactin dephosphorylation to mature invadopodia, SHIP2 recruits Mena to invadopodia, Mena11a suppresses protrusion, Notch1 drives MenaINV, and MenaINV confers taxane resistance.\",\n      \"evidence\": \"Live invadopodium imaging, phospho-cortactin/PTP1B localization, reciprocal SHIP2 co-IP with metastasis model, isoform siRNA/TIRF, Notch1 KD epistasis, microtubule stability/MEK inhibitor rescue\",\n      \"pmids\": [\"27824079\", \"27597754\", \"27748415\", \"27901093\", \"27811011\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PTP1B displacement at invadopodia not biochemically reconstituted\", \"Phospho-site in exon 11a governing Mena11a function not fully characterized\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed a non-canonical role for Mena as part of an HnrnpK/PCBP1 ribonucleoprotein controlling activity-dependent local mRNA translation in axons.\",\n      \"evidence\": \"RNA-IP, co-IP with RBPs, polysome assays, BDNF-stimulated reporter translation, RNA-seq of Mena-associated mRNAs\",\n      \"pmids\": [\"28735747\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RNA regulation requires Mena's actin activity unknown\", \"Direct RNA contacts of Mena versus partner RBPs not separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified PTBP1 and a TES-mediated mechanism as regulators of MENA function, controlling exon-11a skipping and Mena–lamellipodin complex formation.\",\n      \"evidence\": \"RNA pulldown with mutation analysis and KD/rescue invasion assays (PTBP1); IP-MS and co-IP epistasis (TES–Mena–Lpd)\",\n      \"pmids\": [\"31075540\", \"30728082\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Combinatorial control with ESRP1/RBFOX2 not integrated\", \"TES disruption of Mena–Lpd not structurally defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined profilin 1 as essential for Mena/VASP leading-edge function and showed PFN1 levels set the filopodia/lamellipodia balance.\",\n      \"evidence\": \"PFN1 CRISPR/siRNA KO, leading-edge IF, actin polymerization and filopodia/lamellipodia live imaging\",\n      \"pmids\": [\"32470361\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative thresholds in vivo unknown\", \"Single-lab dataset\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided a structural and thermodynamic framework for ENAH EVH1 specificity, defining a diverged pocket and a secondary site enabling high-affinity bivalent SLiM engagement (e.g., PCARE).\",\n      \"evidence\": \"Proteomic peptide screen, structural analysis, ITC, mutagenesis\",\n      \"pmids\": [\"35076015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular relevance of newly identified binders not tested\", \"Full-length context of bivalent engagement not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked mechanical input to MENA biology, showing matrix stiffness raises MENA expression via FAK and lowers ESRP1 to shift splicing toward pro-intravasation isoforms.\",\n      \"evidence\": \"Tunable hydrogel 3D culture, FAK inhibition, ESRP1 manipulation with isoform assays, in vivo intravasation model, TCGA analysis\",\n      \"pmids\": [\"37027295\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional link from FAK to MENA not defined\", \"Single-lab mechanistic dissection\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse Mena complexes (integrin, PTP1B/SHIP2, RNP, gephyrin, Golgi) are spatially and temporally coordinated within a single cell, and how phosphorylation and splicing jointly tune these outputs, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model integrating splicing, phosphorylation, and partner choice\", \"Structures of most full-length Mena complexes lacking\", \"In vivo isoform-specific knock-in phenotypes incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 1, 30]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 9, 16, 21, 27]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [28]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [21, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 1, 30]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [9, 16, 20]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [22]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [21, 28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [16, 21, 3]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 7]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [14, 15, 27]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [28]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [19, 22]}\n    ],\n    \"complexes\": [\"Mena–PTP1B–SHIP2/EGFR complex\", \"Cdc42–IRSp53–Mena complex\", \"HnrnpK/PCBP1 ribonucleoprotein\", \"gephyrin–profilin–Mena/VASP complex\"],\n    \"partners\": [\"PFN1\", \"EVL\", \"VASP\", \"ITGA5\", \"PTPN1\", \"INPPL1\", \"ZYXIN\", \"TES\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}