{"gene":"VCL","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":1995,"finding":"Vinculin (VCL) contains an intramolecular head-tail autoinhibitory interaction: the 95 kDa head domain masks an F-actin binding site located in the 30 kDa carboxy-terminal tail domain (residues 811–1066). Intact vinculin does not cosediment with F-actin, but isolated tail fragments do, and the head fragment inhibits this interaction, demonstrating that activation requires disruption of the head-tail association.","method":"Cosedimentation assays, crosslinking, transmission electron microscopy, bacterially expressed domain fragments, proteolytic fragmentation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro with multiple orthogonal biochemical methods; foundational and widely replicated","pmids":["7816144"],"is_preprint":false},{"year":1999,"finding":"Paxillin LD motifs function as selective protein-binding interfaces; LD motifs mediate direct binding to vinculin as part of focal adhesion scaffold assembly, implicating vinculin in paxillin-organized cytoskeletal remodeling at focal adhesions.","method":"GST pulldown, microinjection of LD motif peptides, GFP localization, cell migration wound assay","journal":"The Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 2 — direct binding demonstrated by pulldown, functional consequence confirmed by dominant-negative microinjection and migration assay","pmids":["10330411"],"is_preprint":false},{"year":2002,"finding":"The Arp2/3 complex directly binds to the hinge region of vinculin in a phosphatidylinositol-4,5-bisphosphate- and Rac1-dependent manner. This interaction recruits Arp2/3 to new integrin adhesion sites and promotes lamellipodial protrusion and cell spreading; a point mutation in the hinge region selectively blocks Arp2/3 binding and reduces spreading on fibronectin.","method":"Co-immunoprecipitation, GST pulldown, domain mapping with point mutagenesis, vinculin-null cell rescue, spreading/protrusion assays","journal":"The Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding demonstrated in vitro, specific point mutant used to functionally separate Arp2/3 binding from other vinculin activities, vinculin-null cell rescue validates causal role","pmids":["12473693"],"is_preprint":false},{"year":1992,"finding":"The vinculin gene (VCL) maps to chromosomal band 10q22.1–q23, distal to D10S22, established by somatic hybrid panel hybridization, genetic recombination mapping in MEN2 families, and flow-sorted translocation chromosome hybridization.","method":"Somatic cell hybrid panel, genetic linkage mapping, flow-sorted chromosome hybridization","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal physical and genetic mapping methods in single study","pmids":["1505973"],"is_preprint":false},{"year":2007,"finding":"Vinculin head domain regulates integrin dynamics and clustering while the tail domain links focal adhesions to the actin force-transmission machinery. Vinculin constructs with unmasked head and tail binding sites induce dramatic focal adhesion growth through direct interaction with talin, which promotes integrin clustering and increases integrin residency time. Paxillin recruitment at focal adhesions occurs independently of the vinculin tail's paxillin-binding site.","method":"Vinculin head/tail mutant expression, FRAP, integrin clustering assays, co-immunoprecipitation, TIRF microscopy in vinculin-null cells","journal":"The Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple domain mutants with orthogonal functional readouts; vinculin-null cell system with defined rescue","pmids":["18056416"],"is_preprint":false},{"year":2012,"finding":"Vinculin associates with VE-cadherin-based adherens junctions (focal adherens junctions, FAJs) that are attached to radial F-actin bundles and subjected to actomyosin-generated pulling forces. Vinculin protects VE-cadherin junctions from opening during force-dependent remodeling induced by VEGF, TNF-α, or thrombin. FAJ formation requires Rho-Rock-actomyosin contractility but not vinculin itself; however, vinculin loss results in junction opening under force.","method":"Live-cell imaging, vinculin-null endothelial cells, Rho-Rock inhibition, α-catenin vinculin-binding-deficient mutant, tension measurement","journal":"The Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 2 — clean loss-of-function in primary endothelial cells combined with mutant rescue and force perturbation experiments","pmids":["22391038"],"is_preprint":false},{"year":2015,"finding":"ZO-1 depletion in endothelial cells reduces tension on VE-cadherin and causes loss of junctional mechanotransducers including vinculin, inducing vinculin dissociation from the α-catenin–VE-cadherin complex. This places vinculin downstream of ZO-1–JACOP–p114RhoGEF–Rho signaling in regulation of actomyosin-dependent junction tension.","method":"siRNA knockdown, FRET tension sensors, immunofluorescence, co-immunoprecipitation, endothelial barrier assays","journal":"The Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with multiple KDs, FRET-based tension measurement, and co-IP validation","pmids":["25753039"],"is_preprint":false},{"year":2017,"finding":"Mechanistic review consolidating that vinculin is recruited to and activated at both integrin-based focal adhesions and cadherin-based adherens junctions; its autoinhibited head-tail conformation is relieved by simultaneous binding of talin (head) and actin (tail), enabling force transmission and cytoskeletal linkage at adhesion complexes.","method":"Review integrating structural, biochemical, and cell biological evidence","journal":"Cellular and Molecular Life Sciences","confidence":"Medium","confidence_rationale":"Tier 3 — synthesis of established evidence; no new primary experiments","pmids":["28401269"],"is_preprint":false},{"year":2019,"finding":"In contracting cardiomyocytes, mechanical forces from the heartbeat regulate vinculin (VCL) localization and activation. VCL is essential for myofilament maturation in the developing zebrafish heart. Interactome analysis in contracting vs. non-contracting cardiomyocytes identified slingshot protein phosphatase SSH1 as a VCL interactor; VCL recruits SSH1 and its effector cofilin (CFL) to regulate F-actin rearrangement and promote sarcomere myofilament maturation.","method":"Zebrafish genetic model (vcl knockout), quantitative interactomics (mass spectrometry), co-immunoprecipitation, F-actin staining, live imaging of contracting vs. non-contracting hearts","journal":"Developmental Cell","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function in vivo, quantitative interactomics, co-IP validation of VCL–SSH1–CFL axis with defined phenotypic readout","pmids":["31495694"],"is_preprint":false},{"year":2021,"finding":"Loss-of-function (p.D256fs) and gain-of-function (p.L555V) VCL variants cause human neural tube defects. p.L555V increases vinculin protein stability and enhances PCP pathway regulation and cell migration, demonstrating that both reduced and excess VCL function disrupt neural tube closure.","method":"Targeted NGS in NTD cohort, in vitro functional assays (PCP pathway reporter, migration assays), protein stability analysis","journal":"Molecular Genetics & Genomic Medicine","confidence":"Medium","confidence_rationale":"Tier 2-3 — human variant identification plus in vitro functional evaluation; single lab","pmids":["33491343"],"is_preprint":false},{"year":2021,"finding":"Vinculin contains conserved tankyrase-binding motifs (TBMs) in vertebrates (absent in C. elegans). Tankyrase (TNKS) localizes to the plasma membrane belt in epithelial cells, a VCL pool is covalently PARylated (poly-ADP-ribosylated), and overexpression of a VCL TBM-II point mutant induces mesenchymal-like cell shape changes, suggesting TNKS-mediated PARylation of VCL regulates epithelial adherens junction integrity and cell shape.","method":"Sequence conservation analysis, TNKS inhibitor treatment, immunocytofluorescence, subcellular fractionation, PAR affinity precipitation + western blot, transfection of TBM mutant VCL","journal":"PeerJ","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct biochemical demonstration of VCL PARylation, TBM mutant phenotype; single lab with partial follow-up","pmids":["34123588"],"is_preprint":false},{"year":2024,"finding":"miR-6721-5p directly interacts with the 3'-UTR of meta-VCL (the muscle-specific large splice isoform of VCL) and negatively regulates its expression. Upregulation of miR-6721-5p in CAD patients correlates with reduced meta-VCL and decreased anti-inflammatory cytokines IL-10 and TNF-α.","method":"Dual-luciferase 3'-UTR reporter assay, qPCR, ELISA for cytokines, bioinformatics, ROC curve analysis of serum samples","journal":"Non-coding RNA Research","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct miRNA-target interaction validated by dual-luciferase; single lab","pmids":["39296643"],"is_preprint":false},{"year":2023,"finding":"miR-29a-3p directly targets the 3'-UTR of VCL (and CTNNB1) in nasal epithelial cells, reducing VCL protein expression. VCL and β-catenin contribute to adherens junction and tight junction integrity of nasal mucosa; miR-29a-3p upregulation in allergic rhinitis disrupts epithelial barrier function, which is partially rescued by miR-29a-3p antagomir in OVA-induced AR mice.","method":"Dual-luciferase reporter assay, miRNA mimic/inhibitor transfection, OVA-induced AR mouse model, qPCR, antagomir treatment, barrier function assays","journal":"International Immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — direct 3'-UTR target validation plus in vivo rescue experiment; single lab","pmids":["37262956"],"is_preprint":false},{"year":2025,"finding":"VCL plasma levels are elevated in Omicron SARS-CoV-2 infection and correlate with inflammatory markers and lung exudation. Anti-VCL intervention in a rat lung injury model reduces plasma VCL levels, mitigates alveolar edema, and restores alveolar-capillary barrier integrity, demonstrating that VCL modulation affects vascular leakage and extravasation.","method":"Multi-omics proteomics/metabolomics of human plasma, rat lung injury model, anti-VCL antibody intervention, histological staining, electron microscopy","journal":"Nature Communications","confidence":"Medium","confidence_rationale":"Tier 2 — functional in vivo intervention with defined histological readouts; single study","pmids":["40268929"],"is_preprint":false},{"year":2024,"finding":"VCL is identified as a novel CRBN (cereblon) neosubstrate degradable by molecular glue degraders; ubiquitinomics analysis confirms VCL ubiquitylation upon treatment with phenyl glutarimide-based degraders, enabling targeted proteasomal degradation of VCL without a classical CRBN degron motif.","method":"High-throughput proteomics + ubiquitinomics (DIA-MS), 100-compound CRBN-ligand screen across cancer cell lines","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 — MS-based ubiquitinomics validated across compounds; preprint, single study","pmids":["bio_10.1101_2024.10.18.618633"],"is_preprint":true},{"year":2024,"finding":"RBM10 loss causes exon inclusion in VCL pre-mRNA; knockdown of the VCL exon-inclusion isoform in RBM10-null cells reduces cell velocity, while combined knockdown of VCL, CD44, and TNC exon-inclusion isoforms reverses metastasis in HrasG12V/Rbm10-KO mouse thyrocytes, demonstrating a specific pro-migratory function of the VCL exon-inclusion isoform.","method":"RNA-seq, isoform-specific siRNA knockdown, cell velocity assay, mouse Hras/Rbm10 KO tumor model, CRISPR screen","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 — isoform-specific knockdown with velocity phenotype and in vivo metastasis rescue; preprint","pmids":["bio_10.1101_2024.07.09.602730"],"is_preprint":true},{"year":2025,"finding":"In Ccm1-deficient zebrafish, endothelial vinculin displays excessive mechanically active focal adhesions in vivo. Genetic deletion of Talin1 to decouple focal adhesions demonstrates that the integrin β1–Talin1 complex acts independently of or downstream of KLF2/4 to drive endothelial cell enlargement and vascular malformation in CCM1-deficiency, repositioning vinculin-associated focal adhesion signaling in CCM pathogenesis.","method":"Live imaging of vinculin in ccm1 zebrafish mutants, Talin1 genetic deletion, CCM1-KO endothelial cells, force redistribution measurements","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo live imaging plus genetic epistasis; preprint, single study","pmids":["bio_10.1101_2025.11.25.688491"],"is_preprint":true},{"year":2024,"finding":"Vinculin phosphorylation at tyrosine 822 (pY822) correlates with dynamic junction remodeling in the developing mouse heart and is lost as junctions mature postnatally. Homozygous Y822F knock-in mice develop cardiac dysfunction by 28 weeks; Y822F hearts show reduced vinculin and adherens junction proteins at cardiomyocyte junctions and increased α5/β1 integrin and fibronectin along lateral borders, demonstrating that pY822 regulates the balance between cadherin-based and integrin-based adhesion organization in cardiomyocytes.","method":"Y822F knock-in mouse model, cardiac function assessment (echocardiography), immunofluorescence quantification of junction proteins, biochemical fractionation","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo knock-in mouse with defined cardiac phenotype and molecular readouts; preprint","pmids":["bio_10.1101_2024.10.28.620745"],"is_preprint":true},{"year":2024,"finding":"Molecular dynamics simulations with enhanced sampling reveal that vinculin forms a catch bond with F-actin: force application increases bond lifetime, and this behavior is direction-dependent. Force shifts vinculin between weakly- and strongly-bound states, with both states having intrinsic catch bonding character; directional force promotes one state over the other, providing mechanistic insight into vinculin's role in mechanotransduction at focal adhesions.","method":"All-atom molecular dynamics simulation with enhanced sampling; comparison of predicted unbinding times with single-molecule experimental data","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 1 computational — rigorous MD with enhanced sampling, validated against single-molecule experiments; preprint","pmids":["bio_10.1101_2024.10.10.617580"],"is_preprint":true},{"year":2025,"finding":"Integrating FRET-based vinculin tension sensors (VinTS) with traction force microscopy reveals that at the cell level, vinculin tension and cellular tractions both increase with substrate stiffness. At the focal adhesion level, vinculin tension correlates with vinculin density while tractions scale with FA area and total vinculin content. Sub-FA analysis shows tension and traction both increase toward the cell periphery, establishing a multiscale mechanotransduction framework for vinculin.","method":"FRET vinculin tension sensor (VinTS), traction force microscopy (TFM), sub-FA spatial analysis","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 1-2 — dual biophysical methods (FRET + TFM) in same cells; preprint, single lab","pmids":["bio_10.1101_2025.01.09.632081"],"is_preprint":true}],"current_model":"Vinculin (VCL) is an autoinhibited mechanosensory adaptor protein in which head-tail intramolecular association masks an F-actin binding site in the tail; activation by simultaneous talin (head) and actin (tail) binding opens this conformation at focal adhesions and cadherin-based adherens junctions, where vinculin directly recruits the Arp2/3 complex via its hinge region to couple actin polymerization to integrin engagement, senses and transmits mechanical force (forming a direction-dependent catch bond with actin), protects VE-cadherin junctions from force-induced opening, and in cardiomyocytes recruits the SSH1–cofilin axis to regulate F-actin rearrangement and myofilament maturation; vinculin is regulated post-translationally by tyrosine 822 phosphorylation (controlling the cadherin/integrin adhesion balance in the heart), PARylation by tankyrase at epithelial adherens junctions, and miRNA-mediated translational repression (miR-6721-5p targets meta-VCL; miR-29a-3p targets VCL to disrupt epithelial barrier function), while alternative splicing of VCL by RBM10 generates a pro-migratory isoform."},"narrative":{"teleology":[{"year":1995,"claim":"Establishing the autoinhibition mechanism resolved how vinculin exists in an inactive cytoplasmic pool despite possessing potent F-actin binding activity: the 95 kDa head domain masks the tail's actin-binding site, and activation requires disruption of this intramolecular contact.","evidence":"Cosedimentation, crosslinking, and electron microscopy of bacterially expressed head and tail domain fragments","pmids":["7816144"],"confidence":"High","gaps":["The physiological signals that relieve autoinhibition in cells were not identified","Structural details of the head–tail interface at atomic resolution were not resolved","Whether intermediate partially open states exist was not addressed"]},{"year":1999,"claim":"Identification of paxillin LD motifs as direct vinculin-binding interfaces established vinculin as a scaffold component linking signaling adaptors to the focal adhesion cytoskeleton.","evidence":"GST pulldown of LD motif–vinculin interaction; dominant-negative LD peptide microinjection disrupts migration","pmids":["10330411"],"confidence":"High","gaps":["Whether paxillin–vinculin binding requires vinculin activation or occurs with the autoinhibited form was unclear","Relative contribution of paxillin versus talin to vinculin recruitment was not quantified"]},{"year":2002,"claim":"Discovery that vinculin's hinge region directly recruits the Arp2/3 complex in a PIP2- and Rac1-dependent manner revealed a mechanism by which integrin engagement is coupled to actin polymerization and lamellipodial protrusion.","evidence":"Co-IP, GST pulldown, point mutagenesis of the hinge region, vinculin-null cell rescue and spreading assays","pmids":["12473693"],"confidence":"High","gaps":["Whether Arp2/3 binding is compatible with the autoinhibited conformation was not resolved","The temporal sequence of Arp2/3 recruitment relative to talin binding was not established"]},{"year":2007,"claim":"Domain-dissection in vinculin-null cells demonstrated that the head domain promotes integrin clustering and residency via talin, while the tail domain links adhesions to the actin force-transmission network, providing a bipartite model for vinculin's role in focal adhesion growth.","evidence":"Head/tail mutant expression, FRAP, integrin clustering assays, TIRF microscopy in vinculin-null MEFs","pmids":["18056416"],"confidence":"High","gaps":["Force dependence of head-mediated integrin clustering was not measured","Whether tail-mediated actin coupling requires catch-bond behavior was unknown"]},{"year":2012,"claim":"Extending vinculin's role beyond focal adhesions, demonstration that vinculin protects VE-cadherin junctions from force-induced opening established it as a mechanosensory effector at endothelial adherens junctions.","evidence":"Vinculin-null endothelial cells, α-catenin vinculin-binding-deficient mutant rescue, Rho-Rock inhibition, live-cell tension measurement","pmids":["22391038"],"confidence":"High","gaps":["How vinculin is activated specifically at cadherin versus integrin adhesions was not resolved","Whether vinculin at adherens junctions recruits Arp2/3 as at focal adhesions was untested"]},{"year":2015,"claim":"Placing vinculin downstream of ZO-1–JACOP–p114RhoGEF–Rho signaling at endothelial junctions defined the upstream pathway controlling vinculin recruitment to mechanically loaded cadherin complexes.","evidence":"siRNA epistasis, FRET tension sensors on VE-cadherin, co-IP, endothelial barrier assays","pmids":["25753039"],"confidence":"High","gaps":["Whether this signaling axis operates at epithelial or other cadherin junctions was not tested","Direct phosphorylation or conformational activation by this pathway was not shown"]},{"year":2019,"claim":"In cardiomyocytes, vinculin was shown to be essential for myofilament maturation by recruiting the SSH1–cofilin axis to regulate F-actin dynamics in response to contractile forces, extending vinculin's function to sarcomere assembly.","evidence":"Zebrafish vcl knockout, quantitative interactomics (MS), co-IP of VCL–SSH1–CFL, live imaging of contracting hearts","pmids":["31495694"],"confidence":"High","gaps":["Whether SSH1 binding requires vinculin activation or a specific phosphorylation state was not determined","The structural basis for the VCL–SSH1 interaction was not mapped"]},{"year":2021,"claim":"Identification of both loss-of-function and gain-of-function VCL variants in human neural tube defects demonstrated that precise vinculin dosage is critical for PCP-dependent morphogenetic cell movements during development.","evidence":"Targeted NGS in NTD cohort, PCP pathway reporter assay, migration assays, protein stability analysis","pmids":["33491343"],"confidence":"Medium","gaps":["Variants identified in a single cohort without replication in independent populations","How VCL gain-of-function enhances PCP signaling mechanistically was not resolved","Animal model validation of neural tube phenotype for these specific variants was not performed"]},{"year":2021,"claim":"Discovery that tankyrase PARylates vinculin at conserved TBM motifs at epithelial adherens junctions introduced PARylation as a post-translational regulatory mechanism controlling vinculin function and epithelial cell shape.","evidence":"PAR affinity precipitation, TBM-II point mutant overexpression induces mesenchymal shape change, TNKS inhibitor treatment","pmids":["34123588"],"confidence":"Medium","gaps":["Specific PARylated residues were not mapped","How PARylation affects vinculin autoinhibition or binding partners was not determined","No loss-of-function genetic approach for endogenous VCL PARylation"]},{"year":2023,"claim":"Validation of miR-29a-3p as a direct negative regulator of VCL expression linked miRNA-mediated vinculin downregulation to epithelial barrier disruption in allergic rhinitis, extending vinculin regulation to post-transcriptional control in disease contexts.","evidence":"Dual-luciferase 3ʹ-UTR reporter, miR-29a-3p mimic/antagomir, OVA-induced AR mouse model with barrier function rescue","pmids":["37262956"],"confidence":"Medium","gaps":["Whether miR-29a-3p regulation of VCL operates in other barrier tissues was not tested","Relative contribution of VCL versus CTNNB1 downregulation to barrier loss was not separated"]},{"year":2025,"claim":"Evidence that extracellular/plasma VCL levels correlate with vascular leakage and that anti-VCL intervention restores alveolar-capillary barrier integrity in lung injury expanded vinculin's relevance from intracellular mechanotransduction to a potential circulating mediator of vascular pathology.","evidence":"Multi-omics proteomics of COVID-19 patient plasma, anti-VCL antibody intervention in rat lung injury model, histology and electron microscopy","pmids":["40268929"],"confidence":"Medium","gaps":["Mechanism by which extracellular VCL promotes vascular leakage is unknown","Whether plasma VCL is actively secreted or a passive release marker was not distinguished","Single preclinical model without independent replication"]},{"year":null,"claim":"Key unresolved questions include the structural basis and in vivo dynamics of vinculin's catch-bond with F-actin, whether distinct post-translational modifications (pY822, PARylation) regulate autoinhibition relief or partner selectivity, and the functional significance of alternative VCL splice isoforms generated by RBM10-dependent splicing in cancer cell migration.","evidence":"","pmids":[],"confidence":"Low","gaps":["Atomic-resolution structure of vinculin's catch bond with actin under force is lacking","Interplay between pY822 phosphorylation and PARylation in regulating cadherin vs. integrin adhesion balance is unexplored","In vivo functional validation of the RBM10-regulated pro-migratory VCL splice isoform beyond preprint data"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,2,4,5,8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,4,5,6]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,4,5]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,2,4,5,10]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,2,4,8]}],"pathway":[{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[1,4,5,6]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[4,5]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,6,8]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[8,9]}],"complexes":["Focal adhesion complex","Cadherin–catenin adherens junction complex"],"partners":["TLN1","ACTR2","PXN","CTNNA1","CDH5","SSH1","CFL1","TNKS"],"other_free_text":[]},"mechanistic_narrative":"Vinculin is an autoinhibited mechanosensory adaptor protein that couples integrin- and cadherin-based adhesion complexes to the actin cytoskeleton, functioning as a central hub for force transmission and mechanotransduction at focal adhesions and adherens junctions. In its resting state, an intramolecular head–tail interaction masks the C-terminal F-actin binding site; simultaneous engagement of talin via the head domain and F-actin via the tail domain relieves autoinhibition, enabling vinculin to promote integrin clustering, recruit the Arp2/3 complex through its hinge region for localized actin polymerization, and protect VE-cadherin junctions from force-induced opening [PMID:7816144, PMID:12473693, PMID:22391038, PMID:18056416]. In cardiomyocytes, vinculin recruits the SSH1–cofilin axis to regulate F-actin rearrangement required for sarcomere maturation, and phosphorylation at tyrosine 822 governs the balance between cadherin- and integrin-based adhesion organization [PMID:31495694]. Both loss-of-function and gain-of-function VCL variants have been identified in human neural tube defects, indicating that precise vinculin dosage is critical for morphogenetic cell movements [PMID:33491343]."},"prefetch_data":{"uniprot":{"accession":"P18206","full_name":"Vinculin","aliases":["Metavinculin","MV"],"length_aa":1134,"mass_kda":123.8,"function":"Actin filament (F-actin)-binding protein involved in cell-matrix adhesion and cell-cell adhesion. Regulates cell-surface E-cadherin expression and potentiates mechanosensing by the E-cadherin complex. May also play important roles in cell morphology and locomotion","subcellular_location":"Cell membrane; Cell junction, adherens junction; Cell junction, focal adhesion; Cytoplasm, cytoskeleton; Cell membrane, sarcolemma; Cell projection, podosome; Cytoplasm, perinuclear region","url":"https://www.uniprot.org/uniprotkb/P18206/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/VCL","classification":"Not Classified","n_dependent_lines":306,"n_total_lines":1208,"dependency_fraction":0.2533112582781457},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000035403","cell_line_id":"CID000622","localizations":[{"compartment":"cell_contact","grade":3},{"compartment":"cytoplasmic","grade":3},{"compartment":"focal_adhesions","grade":3}],"interactors":[{"gene":"ARHGAP17","stoichiometry":0.2},{"gene":"CLTA","stoichiometry":0.2},{"gene":"INPPL1","stoichiometry":0.2},{"gene":"BRCA1","stoichiometry":0.2},{"gene":"CTNNA1","stoichiometry":0.2},{"gene":"TLN1","stoichiometry":0.2},{"gene":"HSPBP1","stoichiometry":0.2},{"gene":"RCC2","stoichiometry":0.2},{"gene":"LLGL1","stoichiometry":0.2},{"gene":"RPAP2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000622","total_profiled":1310},"omim":[{"mim_id":"620884","title":"FER1-LIKE FAMILY, MEMBER 6; FER1L6","url":"https://www.omim.org/entry/620884"},{"mim_id":"618441","title":"ADHESION G PROTEIN-COUPLED RECEPTOR G3; ADGRG3","url":"https://www.omim.org/entry/618441"},{"mim_id":"616970","title":"MARVEL DOMAIN-CONTAINING PROTEIN 1; MARVELD1","url":"https://www.omim.org/entry/616970"},{"mim_id":"616821","title":"THROMBOSPONDIN TYPE 1 DOMAIN-CONTAINING PROTEIN 1; THSD1","url":"https://www.omim.org/entry/616821"},{"mim_id":"614606","title":"FOCADHESIN; FOCAD","url":"https://www.omim.org/entry/614606"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Focal adhesion sites","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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complexes.","date":"2015","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/26344197","citation_count":407,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10330411","id":"PMC_10330411","title":"Paxillin LD4 motif binds PAK and PIX through a novel 95-kD ankyrin repeat, ARF-GAP protein: A role in cytoskeletal remodeling.","date":"1999","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/10330411","citation_count":402,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"22391038","id":"PMC_22391038","title":"Vinculin associates with endothelial VE-cadherin junctions to control force-dependent remodeling.","date":"2012","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/22391038","citation_count":390,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"28401269","id":"PMC_28401269","title":"Vinculin in cell-cell and cell-matrix adhesions.","date":"2017","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/28401269","citation_count":350,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12473693","id":"PMC_12473693","title":"Recruitment of the Arp2/3 complex to vinculin: coupling membrane protrusion to matrix adhesion.","date":"2002","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/12473693","citation_count":339,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"34079125","id":"PMC_34079125","title":"A proximity-dependent biotinylation map of a human cell.","date":"2021","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/34079125","citation_count":339,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"7816144","id":"PMC_7816144","title":"F-actin binding site masked by the intramolecular association of vinculin head and tail domains.","date":"1995","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/7816144","citation_count":329,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":25788,"output_tokens":2537,"usd":0.057709},"stage2":{"model":"claude-opus-4-6","input_tokens":5853,"output_tokens":2257,"usd":0.128535},"total_usd":0.482055,"stage1_batch_id":"msgbatch_01BparvgRZ9S2LMidvaoo86K","stage2_batch_id":"msgbatch_01NkBfv9SVZWthhS7j6mU6G3","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":37578,"output_tokens":6799,"usd":0.107359},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":9057,"output_tokens":3214,"usd":0.188452}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2019,\n      \"finding\": \"Mechanical forces from cardiac contractility regulate the localization and activation of vinculin (VCL) in cardiomyocytes. VCL recruits the phosphatase SSH1 and its effector cofilin (CFL) to regulate F-actin rearrangement and promote myofilament maturation, defining a VCL-SSH1-CFL axis downstream of mechanical stimuli.\",\n      \"method\": \"Zebrafish genetic model (contracting vs. non-contracting cardiomyocytes), VCL interactome by mass spectrometry, co-immunoprecipitation, loss-of-function with myofilament maturation phenotype\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, MS interactome, clean KO with defined cellular phenotype, replicated across orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"31495694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Vinculin phosphorylation at tyrosine residue 822 (pY822) regulates the balance between cadherin-based adherens junctions and integrin-based cell-matrix adhesions in cardiomyocytes; loss of pY822 (Y822F knock-in mice) leads to reduced vinculin and adherens junction proteins at junctions, increased α5/β1 integrin and fibronectin at lateral borders, and cardiac dysfunction by 28 weeks.\",\n      \"method\": \"Mouse knock-in (Y822F point mutation), cardiac imaging, immunofluorescence, western blot, in vivo functional phenotyping\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KI mouse with defined cellular and functional phenotype; preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2024.10.28.620745\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Vinculin (VCL) contains tankyrase-binding motifs (TBMs) conserved in vertebrates; tankyrase (TNKS) poly(ADP-ribosylates) a pool of VCL at adherens junctions in epithelial cells, and mutation of TBM-II in VCL induces mesenchymal-like cell shape changes, implicating TNKS-mediated PARylation of VCL in junction integrity and epithelial cell shape.\",\n      \"method\": \"Affinity precipitation with PAR-binding reagent followed by western blot, TNKS inhibitor treatment, immunocytofluorescence, subcellular fractionation, transfection with TBM mutant VCL\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — biochemical PARylation evidence plus functional TBM mutagenesis, single lab, moderate orthogonality\",\n      \"pmids\": [\"34123588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"miR-6721-5p directly interacts with the 3'-UTR of meta-VCL (a muscle-specific splice isoform of VCL) and suppresses its expression, as validated by dual-luciferase reporter assay; downregulation of meta-VCL by miR-6721-5p is associated with reduced anti-inflammatory cytokines IL-10 and TNF-α.\",\n      \"method\": \"Dual-luciferase reporter assay, ectopic expression analysis, real-time PCR, ELISA for cytokines\",\n      \"journal\": \"Non-coding RNA research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct miRNA-target validation by luciferase assay plus expression studies; single lab\",\n      \"pmids\": [\"39296643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"miR-29a-3p directly targets the 3'-UTR of VCL (and CTNNB1), reducing VCL protein expression in nasal epithelial cells; this suppression impairs adherens junction and tight junction integrity, increasing epithelial permeability in an allergic rhinitis model, as validated by luciferase assay and in vivo antagomir rescue.\",\n      \"method\": \"Dual-luciferase reporter assay, miR-29a-3p mimic/inhibitor in HNEpC cells, OVA-induced AR mouse model with antagomir treatment, barrier function assays\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct target validation by luciferase assay, in vitro and in vivo rescue; single lab\",\n      \"pmids\": [\"37262956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss-of-function and gain-of-function VCL variants identified in human neural tube defect patients were functionally evaluated: the p.D256fs variant is a loss-of-function allele, while p.L555V is a gain-of-function variant with enhanced protein stability that augments planar cell polarity (PCP) pathway signaling and cell migration.\",\n      \"method\": \"Targeted next-generation sequencing, functional cell migration assay, PCP pathway reporter assay, protein stability analysis\",\n      \"journal\": \"Molecular genetics & genomic medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — human variant functional evaluation with defined cellular phenotypes; single lab\",\n      \"pmids\": [\"33491343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"VCL forms a catch bond with F-actin in which applied force shifts vinculin between weakly- and strongly-bound states, increasing bond lifetime in a direction-dependent manner relevant to cellular mechanotransduction.\",\n      \"method\": \"Molecular dynamics simulation with enhanced sampling techniques, modeled against single-molecule experimental data\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational simulation only, no direct in vitro or in vivo experimental validation in this study\",\n      \"pmids\": [\"bio_10.1101_2024.10.10.617580\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Anti-VCL intervention in a rat lung injury model reduced plasma VCL levels, mitigated alveolar edema, and restored alveolar-capillary barrier integrity, demonstrating that VCL modulation affects vascular leakage and extravasation in SARS-CoV-2-associated lung injury.\",\n      \"method\": \"Rat model of lung injury, anti-VCL antibody intervention, histological staining, electron microscopy, plasma proteomics\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function (antibody intervention) with defined histological and ultrastructural phenotype in vivo; single lab\",\n      \"pmids\": [\"40268929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RBM10 loss leads to exon-inclusion events in VCL mRNA; knockdown of the VCL exon-inclusion transcript in RBM10-null cells reduced cell velocity, implicating this VCL splice isoform in promoting cell migration downstream of RBM10 loss.\",\n      \"method\": \"RNA-seq, isoform-specific knockdown, cell velocity assay, mouse Hras/Rbm10 KO thyrocyte model\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific KD with defined migration phenotype, in vitro and in vivo; preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2024.07.09.602730\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The VCL gene encoding vinculin, a cytoskeletal protein component of adherens-type cell junctions, was mapped to chromosomal band 10q22.1-q23 by a combination of somatic hybrid panel hybridization, genetic recombination mapping, and hybridization to flow-sorted translocation derivative chromosomes.\",\n      \"method\": \"Human-rodent somatic hybrid panel, genetic recombination mapping in MEN2 families, FISH to flow-sorted chromosomes\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal physical and genetic mapping methods; single study\",\n      \"pmids\": [\"1505973\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Vinculin (VCL) is a mechanosensitive cytoskeletal adaptor protein that links filamentous actin to cell-matrix focal adhesions and cell-cell adherens junctions; it is activated by mechanical forces (e.g., cardiac contractility) to recruit SSH1 and cofilin for F-actin remodeling and myofilament maturation, its activity is regulated by tyrosine phosphorylation (pY822) that balances integrin versus cadherin adhesion, it is post-translationally modified by tankyrase-mediated poly(ADP-ribosyl)ation at adherens junctions, its expression is regulated by miRNAs (miR-6721-5p targets the muscle-specific meta-VCL isoform; miR-29a-3p targets canonical VCL) to control epithelial barrier integrity, and specific splice isoforms generated by RBM10-dependent exon inclusion promote cell migration and metastatic competency.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries from KEEP papers.\n\n**Classification:**\n- Papers 1, 2, 9, 11, 14, 23 (corpus): VCL-ALK fusion oncology — these describe VCL as a fusion *partner*, not the canonical protein's function → EXCLUDE (alias collision context; no mechanistic insight into VCL protein itself)\n- Papers 3, 5, 6, 8 (corpus): \"VCL\" = von Willebrand factor fragment peptide (recombinant vWF domain) → EXCLUDE (alias collision)\n- Paper 10 (corpus): VINC = virus-inducible non-coding RNA (NEAT1/Men epsilon) → EXCLUDE (alt-locus product / alias collision)\n- Paper 12 (corpus): VCL-CB01 = CMV DNA vaccine → EXCLUDE (alias collision)\n- Papers 16, 19, 20 (corpus): HL60/VINC = vincristine-resistant cell line → EXCLUDE (alias collision)\n- Papers 18, 21, 24 (corpus): VCl = vanadium chloride / VinC = glycosyltransferase / poly(VCL-AETA) hydrogel → EXCLUDE (symbol collision)\n- Paper 25 (corpus): VinC = glycosyltransferase from Streptomyces → EXCLUDE (symbol collision)\n- Paper 37 (corpus): VCL = Vocal Call Locator Benchmark → EXCLUDE (symbol collision)\n- Paper 38 (corpus): VCL = curvilinear velocity of sperm → EXCLUDE (symbol collision)\n- Paper 46 (corpus): VCL = curvilinear velocity of sperm → EXCLUDE (symbol collision)\n- Paper 7 (corpus): Association study only → EXCLUDE (no mechanism)\n- Paper 26 (corpus): GWAS/association study → EXCLUDE (no mechanism)\n- Paper 29 (corpus): Bioinformatics/molecular docking only → EXCLUDE (Tier 4)\n- Paper 13 (corpus): IHC + Western blot correlative, no direct VCL mechanism → EXCLUDE\n- Paper 15 (corpus): DCM family case report, VCL mutation described clinically → EXCLUDE (no mechanism)\n- Paper 33 (corpus): Clinical/structural alignment only, no functional experiment → EXCLUDE\n- Paper 34 (corpus): VCL::ROS1 fusion, oncology case report → EXCLUDE\n- Paper 4 (corpus): KEEP — VCL in cardiomyocyte maturation, zebrafish model, mechanistic\n- Paper 22 (corpus): KEEP — miR-6721-5p regulates meta-VCL, dual-luciferase validation\n- Paper 27 (corpus): KEEP — miR-21-5p regulates VCL in T lymphocytes\n- Paper 28 (corpus): KEEP — miR-29a-3p targets VCL/CTNNB1 in nasal epithelial barrier\n- Paper 30 (corpus): KEEP — VCL variants in NTDs, functional evaluation\n- Paper 31 (corpus): KEEP — VCL TBM, tankyrase PARylation, AJ function\n- Paper 32 (corpus): KEEP — VCL pathway in SARS-CoV-2 lung injury, functional anti-VCL intervention\n- Paper 17 (corpus): KEEP — VCL gene chromosomal mapping (foundational)\n- Papers 35, 36, 40, 41, 43, 44, 45, 47, 48 (preprints): evaluate each\n  - 35: Vinculin in focal adhesions in CCM zebrafish model → KEEP (vinculin protein, mechanistic)\n  - 36: Vinculin Y822 phosphorylation in cardiomyocyte adhesion → KEEP\n  - 40: VCL exon inclusion in RBM10-null cells promotes migration → KEEP (mechanistic)\n  - 41: Vinculin inverse relationship with claudin-5 in BBB → KEEP (mechanistic)\n  - 43: VinTS FRET + TFM, vinculin tension/traction in focal adhesions → KEEP\n  - 44: Vinculin-actin catch bond MD simulation → KEEP\n  - 45: NUAK1 KD reduces vinculin gene expression + contraction → borderline, vinculin mentioned as downstream readout → KEEP (low confidence)\n  - 47: Vinculin activation in cardiomyocytes by stiffness/EFs → KEEP (low)\n  - 48: Vinculin tracking in MSC → KEEP (low, descriptive)\n  - 39: VCL as CRBN neosubstrate for degrader → KEEP (mechanistic PTM/degradation)\n  - 42: Vcl gene expression as mechanotransduction marker → EXCLUDE (expression only)\n\n**gene2pubmed curated papers:**\n- PMID 18056416: Vinculin controls FA formation via talin and actin — KEEP\n- PMID 22391038: Vinculin at VE-cadherin junctions, force-dependent remodeling — KEEP\n- PMID 28401269: Vinculin review (roles in cell-cell and cell-matrix adhesions) — KEEP (review, but cites mechanisms)\n- PMID 12473693: Arp2/3 complex recruits to vinculin — KEEP\n- PMID 7816144: F-actin binding site masked by head-tail intramolecular association — KEEP\n- PMID 21423176: FA proteome, myosin II responsive — KEEP (vinculin mentioned in FA context)\n- PMID 25753039: ZO-1 controls vinculin at VE-cadherin — KEEP\n- PMID 10330411: Paxillin LD motifs bind vinculin — KEEP\n- PMID 26496610, 17081983, others: Large interactome/phosphoproteome studies — vinculin detected but not specifically studied → EXCLUDE from discoveries (too generic)\n- PMID 1505973: VCL chromosomal mapping — KEEP\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"Vinculin (VCL) contains an intramolecular head-tail autoinhibitory interaction: the 95 kDa head domain masks an F-actin binding site located in the 30 kDa carboxy-terminal tail domain (residues 811–1066). Intact vinculin does not cosediment with F-actin, but isolated tail fragments do, and the head fragment inhibits this interaction, demonstrating that activation requires disruption of the head-tail association.\",\n      \"method\": \"Cosedimentation assays, crosslinking, transmission electron microscopy, bacterially expressed domain fragments, proteolytic fragmentation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro with multiple orthogonal biochemical methods; foundational and widely replicated\",\n      \"pmids\": [\"7816144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Paxillin LD motifs function as selective protein-binding interfaces; LD motifs mediate direct binding to vinculin as part of focal adhesion scaffold assembly, implicating vinculin in paxillin-organized cytoskeletal remodeling at focal adhesions.\",\n      \"method\": \"GST pulldown, microinjection of LD motif peptides, GFP localization, cell migration wound assay\",\n      \"journal\": \"The Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding demonstrated by pulldown, functional consequence confirmed by dominant-negative microinjection and migration assay\",\n      \"pmids\": [\"10330411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The Arp2/3 complex directly binds to the hinge region of vinculin in a phosphatidylinositol-4,5-bisphosphate- and Rac1-dependent manner. This interaction recruits Arp2/3 to new integrin adhesion sites and promotes lamellipodial protrusion and cell spreading; a point mutation in the hinge region selectively blocks Arp2/3 binding and reduces spreading on fibronectin.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, domain mapping with point mutagenesis, vinculin-null cell rescue, spreading/protrusion assays\",\n      \"journal\": \"The Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding demonstrated in vitro, specific point mutant used to functionally separate Arp2/3 binding from other vinculin activities, vinculin-null cell rescue validates causal role\",\n      \"pmids\": [\"12473693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The vinculin gene (VCL) maps to chromosomal band 10q22.1–q23, distal to D10S22, established by somatic hybrid panel hybridization, genetic recombination mapping in MEN2 families, and flow-sorted translocation chromosome hybridization.\",\n      \"method\": \"Somatic cell hybrid panel, genetic linkage mapping, flow-sorted chromosome hybridization\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal physical and genetic mapping methods in single study\",\n      \"pmids\": [\"1505973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Vinculin head domain regulates integrin dynamics and clustering while the tail domain links focal adhesions to the actin force-transmission machinery. Vinculin constructs with unmasked head and tail binding sites induce dramatic focal adhesion growth through direct interaction with talin, which promotes integrin clustering and increases integrin residency time. Paxillin recruitment at focal adhesions occurs independently of the vinculin tail's paxillin-binding site.\",\n      \"method\": \"Vinculin head/tail mutant expression, FRAP, integrin clustering assays, co-immunoprecipitation, TIRF microscopy in vinculin-null cells\",\n      \"journal\": \"The Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple domain mutants with orthogonal functional readouts; vinculin-null cell system with defined rescue\",\n      \"pmids\": [\"18056416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Vinculin associates with VE-cadherin-based adherens junctions (focal adherens junctions, FAJs) that are attached to radial F-actin bundles and subjected to actomyosin-generated pulling forces. Vinculin protects VE-cadherin junctions from opening during force-dependent remodeling induced by VEGF, TNF-α, or thrombin. FAJ formation requires Rho-Rock-actomyosin contractility but not vinculin itself; however, vinculin loss results in junction opening under force.\",\n      \"method\": \"Live-cell imaging, vinculin-null endothelial cells, Rho-Rock inhibition, α-catenin vinculin-binding-deficient mutant, tension measurement\",\n      \"journal\": \"The Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function in primary endothelial cells combined with mutant rescue and force perturbation experiments\",\n      \"pmids\": [\"22391038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ZO-1 depletion in endothelial cells reduces tension on VE-cadherin and causes loss of junctional mechanotransducers including vinculin, inducing vinculin dissociation from the α-catenin–VE-cadherin complex. This places vinculin downstream of ZO-1–JACOP–p114RhoGEF–Rho signaling in regulation of actomyosin-dependent junction tension.\",\n      \"method\": \"siRNA knockdown, FRET tension sensors, immunofluorescence, co-immunoprecipitation, endothelial barrier assays\",\n      \"journal\": \"The Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple KDs, FRET-based tension measurement, and co-IP validation\",\n      \"pmids\": [\"25753039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Mechanistic review consolidating that vinculin is recruited to and activated at both integrin-based focal adhesions and cadherin-based adherens junctions; its autoinhibited head-tail conformation is relieved by simultaneous binding of talin (head) and actin (tail), enabling force transmission and cytoskeletal linkage at adhesion complexes.\",\n      \"method\": \"Review integrating structural, biochemical, and cell biological evidence\",\n      \"journal\": \"Cellular and Molecular Life Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — synthesis of established evidence; no new primary experiments\",\n      \"pmids\": [\"28401269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In contracting cardiomyocytes, mechanical forces from the heartbeat regulate vinculin (VCL) localization and activation. VCL is essential for myofilament maturation in the developing zebrafish heart. Interactome analysis in contracting vs. non-contracting cardiomyocytes identified slingshot protein phosphatase SSH1 as a VCL interactor; VCL recruits SSH1 and its effector cofilin (CFL) to regulate F-actin rearrangement and promote sarcomere myofilament maturation.\",\n      \"method\": \"Zebrafish genetic model (vcl knockout), quantitative interactomics (mass spectrometry), co-immunoprecipitation, F-actin staining, live imaging of contracting vs. non-contracting hearts\",\n      \"journal\": \"Developmental Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function in vivo, quantitative interactomics, co-IP validation of VCL–SSH1–CFL axis with defined phenotypic readout\",\n      \"pmids\": [\"31495694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss-of-function (p.D256fs) and gain-of-function (p.L555V) VCL variants cause human neural tube defects. p.L555V increases vinculin protein stability and enhances PCP pathway regulation and cell migration, demonstrating that both reduced and excess VCL function disrupt neural tube closure.\",\n      \"method\": \"Targeted NGS in NTD cohort, in vitro functional assays (PCP pathway reporter, migration assays), protein stability analysis\",\n      \"journal\": \"Molecular Genetics & Genomic Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — human variant identification plus in vitro functional evaluation; single lab\",\n      \"pmids\": [\"33491343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Vinculin contains conserved tankyrase-binding motifs (TBMs) in vertebrates (absent in C. elegans). Tankyrase (TNKS) localizes to the plasma membrane belt in epithelial cells, a VCL pool is covalently PARylated (poly-ADP-ribosylated), and overexpression of a VCL TBM-II point mutant induces mesenchymal-like cell shape changes, suggesting TNKS-mediated PARylation of VCL regulates epithelial adherens junction integrity and cell shape.\",\n      \"method\": \"Sequence conservation analysis, TNKS inhibitor treatment, immunocytofluorescence, subcellular fractionation, PAR affinity precipitation + western blot, transfection of TBM mutant VCL\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct biochemical demonstration of VCL PARylation, TBM mutant phenotype; single lab with partial follow-up\",\n      \"pmids\": [\"34123588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"miR-6721-5p directly interacts with the 3'-UTR of meta-VCL (the muscle-specific large splice isoform of VCL) and negatively regulates its expression. Upregulation of miR-6721-5p in CAD patients correlates with reduced meta-VCL and decreased anti-inflammatory cytokines IL-10 and TNF-α.\",\n      \"method\": \"Dual-luciferase 3'-UTR reporter assay, qPCR, ELISA for cytokines, bioinformatics, ROC curve analysis of serum samples\",\n      \"journal\": \"Non-coding RNA Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct miRNA-target interaction validated by dual-luciferase; single lab\",\n      \"pmids\": [\"39296643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"miR-29a-3p directly targets the 3'-UTR of VCL (and CTNNB1) in nasal epithelial cells, reducing VCL protein expression. VCL and β-catenin contribute to adherens junction and tight junction integrity of nasal mucosa; miR-29a-3p upregulation in allergic rhinitis disrupts epithelial barrier function, which is partially rescued by miR-29a-3p antagomir in OVA-induced AR mice.\",\n      \"method\": \"Dual-luciferase reporter assay, miRNA mimic/inhibitor transfection, OVA-induced AR mouse model, qPCR, antagomir treatment, barrier function assays\",\n      \"journal\": \"International Immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct 3'-UTR target validation plus in vivo rescue experiment; single lab\",\n      \"pmids\": [\"37262956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"VCL plasma levels are elevated in Omicron SARS-CoV-2 infection and correlate with inflammatory markers and lung exudation. Anti-VCL intervention in a rat lung injury model reduces plasma VCL levels, mitigates alveolar edema, and restores alveolar-capillary barrier integrity, demonstrating that VCL modulation affects vascular leakage and extravasation.\",\n      \"method\": \"Multi-omics proteomics/metabolomics of human plasma, rat lung injury model, anti-VCL antibody intervention, histological staining, electron microscopy\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional in vivo intervention with defined histological readouts; single study\",\n      \"pmids\": [\"40268929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"VCL is identified as a novel CRBN (cereblon) neosubstrate degradable by molecular glue degraders; ubiquitinomics analysis confirms VCL ubiquitylation upon treatment with phenyl glutarimide-based degraders, enabling targeted proteasomal degradation of VCL without a classical CRBN degron motif.\",\n      \"method\": \"High-throughput proteomics + ubiquitinomics (DIA-MS), 100-compound CRBN-ligand screen across cancer cell lines\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS-based ubiquitinomics validated across compounds; preprint, single study\",\n      \"pmids\": [\"bio_10.1101_2024.10.18.618633\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RBM10 loss causes exon inclusion in VCL pre-mRNA; knockdown of the VCL exon-inclusion isoform in RBM10-null cells reduces cell velocity, while combined knockdown of VCL, CD44, and TNC exon-inclusion isoforms reverses metastasis in HrasG12V/Rbm10-KO mouse thyrocytes, demonstrating a specific pro-migratory function of the VCL exon-inclusion isoform.\",\n      \"method\": \"RNA-seq, isoform-specific siRNA knockdown, cell velocity assay, mouse Hras/Rbm10 KO tumor model, CRISPR screen\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific knockdown with velocity phenotype and in vivo metastasis rescue; preprint\",\n      \"pmids\": [\"bio_10.1101_2024.07.09.602730\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Ccm1-deficient zebrafish, endothelial vinculin displays excessive mechanically active focal adhesions in vivo. Genetic deletion of Talin1 to decouple focal adhesions demonstrates that the integrin β1–Talin1 complex acts independently of or downstream of KLF2/4 to drive endothelial cell enlargement and vascular malformation in CCM1-deficiency, repositioning vinculin-associated focal adhesion signaling in CCM pathogenesis.\",\n      \"method\": \"Live imaging of vinculin in ccm1 zebrafish mutants, Talin1 genetic deletion, CCM1-KO endothelial cells, force redistribution measurements\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo live imaging plus genetic epistasis; preprint, single study\",\n      \"pmids\": [\"bio_10.1101_2025.11.25.688491\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Vinculin phosphorylation at tyrosine 822 (pY822) correlates with dynamic junction remodeling in the developing mouse heart and is lost as junctions mature postnatally. Homozygous Y822F knock-in mice develop cardiac dysfunction by 28 weeks; Y822F hearts show reduced vinculin and adherens junction proteins at cardiomyocyte junctions and increased α5/β1 integrin and fibronectin along lateral borders, demonstrating that pY822 regulates the balance between cadherin-based and integrin-based adhesion organization in cardiomyocytes.\",\n      \"method\": \"Y822F knock-in mouse model, cardiac function assessment (echocardiography), immunofluorescence quantification of junction proteins, biochemical fractionation\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knock-in mouse with defined cardiac phenotype and molecular readouts; preprint\",\n      \"pmids\": [\"bio_10.1101_2024.10.28.620745\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Molecular dynamics simulations with enhanced sampling reveal that vinculin forms a catch bond with F-actin: force application increases bond lifetime, and this behavior is direction-dependent. Force shifts vinculin between weakly- and strongly-bound states, with both states having intrinsic catch bonding character; directional force promotes one state over the other, providing mechanistic insight into vinculin's role in mechanotransduction at focal adhesions.\",\n      \"method\": \"All-atom molecular dynamics simulation with enhanced sampling; comparison of predicted unbinding times with single-molecule experimental data\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 computational — rigorous MD with enhanced sampling, validated against single-molecule experiments; preprint\",\n      \"pmids\": [\"bio_10.1101_2024.10.10.617580\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Integrating FRET-based vinculin tension sensors (VinTS) with traction force microscopy reveals that at the cell level, vinculin tension and cellular tractions both increase with substrate stiffness. At the focal adhesion level, vinculin tension correlates with vinculin density while tractions scale with FA area and total vinculin content. Sub-FA analysis shows tension and traction both increase toward the cell periphery, establishing a multiscale mechanotransduction framework for vinculin.\",\n      \"method\": \"FRET vinculin tension sensor (VinTS), traction force microscopy (TFM), sub-FA spatial analysis\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — dual biophysical methods (FRET + TFM) in same cells; preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2025.01.09.632081\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"Vinculin (VCL) is an autoinhibited mechanosensory adaptor protein in which head-tail intramolecular association masks an F-actin binding site in the tail; activation by simultaneous talin (head) and actin (tail) binding opens this conformation at focal adhesions and cadherin-based adherens junctions, where vinculin directly recruits the Arp2/3 complex via its hinge region to couple actin polymerization to integrin engagement, senses and transmits mechanical force (forming a direction-dependent catch bond with actin), protects VE-cadherin junctions from force-induced opening, and in cardiomyocytes recruits the SSH1–cofilin axis to regulate F-actin rearrangement and myofilament maturation; vinculin is regulated post-translationally by tyrosine 822 phosphorylation (controlling the cadherin/integrin adhesion balance in the heart), PARylation by tankyrase at epithelial adherens junctions, and miRNA-mediated translational repression (miR-6721-5p targets meta-VCL; miR-29a-3p targets VCL to disrupt epithelial barrier function), while alternative splicing of VCL by RBM10 generates a pro-migratory isoform.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"Vinculin (VCL) is a mechanosensitive cytoskeletal adaptor protein that bridges integrin-based focal adhesions and cadherin-based adherens junctions to the actin cytoskeleton, translating mechanical forces into cytoskeletal remodeling and junction regulation. In cardiomyocytes, mechanical load activates vinculin to recruit the phosphatase SSH1 and cofilin, driving F-actin rearrangement and myofilament maturation, while tyrosine phosphorylation at Y822 governs the balance between cadherin and integrin adhesion complexes [PMID:31495694]. Vinculin is post-translationally modified by tankyrase-mediated poly(ADP-ribosyl)ation at adherens junctions to maintain epithelial cell shape, and its expression is regulated by miRNAs (miR-29a-3p, miR-6721-5p) whose suppression of VCL impairs junctional barrier integrity [PMID:34123588, PMID:37262956]. Human VCL variants contribute to neural tube defects through altered cell migration and planar cell polarity signaling [PMID:33491343].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Mapping VCL to 10q22.1-q23 established the chromosomal identity of the gene encoding a known adherens junction cytoskeletal protein, enabling future genetic studies.\",\n      \"evidence\": \"Somatic hybrid panel, genetic recombination mapping, FISH to flow-sorted chromosomes\",\n      \"pmids\": [\"1505973\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional consequence of locus position determined\", \"No mutation-phenotype association established at this stage\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating that cardiac contractile forces regulate vinculin activation and that vinculin recruits SSH1-cofilin to remodel F-actin established the first mechanotransduction-to-cytoskeletal-remodeling axis through VCL in vivo.\",\n      \"evidence\": \"Zebrafish contracting vs. non-contracting cardiomyocytes, VCL interactome by mass spectrometry, co-immunoprecipitation, loss-of-function phenotyping\",\n      \"pmids\": [\"31495694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the VCL-SSH1-CFL axis operates in non-cardiac cell types is untested\", \"The upstream signaling that transmits contractile force to VCL conformation is unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of tankyrase-binding motifs in VCL and demonstration that TNKS-mediated PARylation at adherens junctions maintains epithelial morphology revealed a novel post-translational regulatory mechanism for vinculin at cell-cell contacts.\",\n      \"evidence\": \"PAR-binding affinity precipitation, TNKS inhibitor treatment, TBM-mutant VCL transfection, immunocytofluorescence\",\n      \"pmids\": [\"34123588\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The stoichiometry and dynamics of VCL PARylation in vivo are unknown\", \"Whether PARylation affects VCL conformational activation or binding partners is not determined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Functional evaluation of human VCL variants from neural tube defect patients linked specific alleles to altered cell migration and PCP signaling, establishing VCL as a candidate gene for this congenital malformation.\",\n      \"evidence\": \"Targeted next-generation sequencing of NTD patients, functional migration and PCP reporter assays, protein stability analysis\",\n      \"pmids\": [\"33491343\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No family segregation or large-cohort replication reported\", \"Mechanism by which VCL gain-of-function enhances PCP signaling is unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating that miR-29a-3p directly suppresses VCL to compromise adherens and tight junction integrity in nasal epithelium connected miRNA-mediated VCL regulation to epithelial barrier dysfunction in allergic disease.\",\n      \"evidence\": \"Dual-luciferase reporter assay, miR-29a-3p mimic/inhibitor in HNEpC cells, OVA-induced allergic rhinitis mouse model with antagomir rescue\",\n      \"pmids\": [\"37262956\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether miR-29a-3p regulation of VCL operates in non-nasal epithelial barriers is untested\", \"Relative contribution of VCL versus CTNNB1 suppression to barrier loss is not separated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showing that Y822 phosphorylation is required for proper vinculin targeting to adherens junctions and for preventing ectopic integrin-fibronectin accumulation revealed how a single phosphosite governs the partitioning of vinculin between the two major adhesion systems in the heart.\",\n      \"evidence\": \"Y822F knock-in mouse, cardiac functional imaging, immunofluorescence, western blot (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.10.28.620745\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint not yet peer-reviewed\", \"The kinase(s) responsible for Y822 phosphorylation in vivo are not identified\", \"Whether pY822 regulation operates outside cardiomyocytes is not tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Discovery that RBM10 loss drives VCL exon-inclusion isoforms that promote cell migration connected alternative splicing regulation to VCL's role in metastatic competency.\",\n      \"evidence\": \"RNA-seq, isoform-specific knockdown, cell velocity assay in Rbm10 KO thyrocytes (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.07.09.602730\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint not yet peer-reviewed\", \"The structural or binding difference conferred by the included exon is unknown\", \"Relevance to human cancer metastasis not demonstrated in patient samples\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Anti-VCL antibody intervention in a lung injury model restored alveolar-capillary barrier integrity, extending VCL's barrier-regulatory role to the pulmonary vasculature during inflammation.\",\n      \"evidence\": \"Rat lung injury model, anti-VCL antibody, histology, electron microscopy, plasma proteomics\",\n      \"pmids\": [\"40268929\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which extracellular/plasma VCL disrupts barrier function is unclear\", \"Whether circulating VCL is a cause or consequence of vascular injury is not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of VCL catch-bond mechanosensing at single-molecule resolution in cells, the identity of kinases that phosphorylate Y822 in vivo, and whether PARylation and phosphorylation interact to coordinately regulate vinculin's partitioning between focal adhesions and adherens junctions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No single-molecule in vitro reconstitution of force-dependent VCL-actin catch bond\", \"Interplay between PARylation, phosphorylation, and splicing regulation of VCL is unstudied\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 6]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 5, 9]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 4, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 2, 4]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [1, 7]}\n    ],\n    \"complexes\": [\n      \"focal adhesion complex\",\n      \"adherens junction complex\"\n    ],\n    \"partners\": [\n      \"SSH1\",\n      \"CFL1\",\n      \"TNKS\",\n      \"CTNNB1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"Vinculin is an autoinhibited mechanosensory adaptor protein that couples integrin- and cadherin-based adhesion complexes to the actin cytoskeleton, functioning as a central hub for force transmission and mechanotransduction at focal adhesions and adherens junctions. In its resting state, an intramolecular head–tail interaction masks the C-terminal F-actin binding site; simultaneous engagement of talin via the head domain and F-actin via the tail domain relieves autoinhibition, enabling vinculin to promote integrin clustering, recruit the Arp2/3 complex through its hinge region for localized actin polymerization, and protect VE-cadherin junctions from force-induced opening [PMID:7816144, PMID:12473693, PMID:22391038, PMID:18056416]. In cardiomyocytes, vinculin recruits the SSH1–cofilin axis to regulate F-actin rearrangement required for sarcomere maturation, and phosphorylation at tyrosine 822 governs the balance between cadherin- and integrin-based adhesion organization [PMID:31495694]. Both loss-of-function and gain-of-function VCL variants have been identified in human neural tube defects, indicating that precise vinculin dosage is critical for morphogenetic cell movements [PMID:33491343].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Establishing the autoinhibition mechanism resolved how vinculin exists in an inactive cytoplasmic pool despite possessing potent F-actin binding activity: the 95 kDa head domain masks the tail's actin-binding site, and activation requires disruption of this intramolecular contact.\",\n      \"evidence\": \"Cosedimentation, crosslinking, and electron microscopy of bacterially expressed head and tail domain fragments\",\n      \"pmids\": [\"7816144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The physiological signals that relieve autoinhibition in cells were not identified\",\n        \"Structural details of the head–tail interface at atomic resolution were not resolved\",\n        \"Whether intermediate partially open states exist was not addressed\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of paxillin LD motifs as direct vinculin-binding interfaces established vinculin as a scaffold component linking signaling adaptors to the focal adhesion cytoskeleton.\",\n      \"evidence\": \"GST pulldown of LD motif–vinculin interaction; dominant-negative LD peptide microinjection disrupts migration\",\n      \"pmids\": [\"10330411\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether paxillin–vinculin binding requires vinculin activation or occurs with the autoinhibited form was unclear\",\n        \"Relative contribution of paxillin versus talin to vinculin recruitment was not quantified\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery that vinculin's hinge region directly recruits the Arp2/3 complex in a PIP2- and Rac1-dependent manner revealed a mechanism by which integrin engagement is coupled to actin polymerization and lamellipodial protrusion.\",\n      \"evidence\": \"Co-IP, GST pulldown, point mutagenesis of the hinge region, vinculin-null cell rescue and spreading assays\",\n      \"pmids\": [\"12473693\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether Arp2/3 binding is compatible with the autoinhibited conformation was not resolved\",\n        \"The temporal sequence of Arp2/3 recruitment relative to talin binding was not established\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Domain-dissection in vinculin-null cells demonstrated that the head domain promotes integrin clustering and residency via talin, while the tail domain links adhesions to the actin force-transmission network, providing a bipartite model for vinculin's role in focal adhesion growth.\",\n      \"evidence\": \"Head/tail mutant expression, FRAP, integrin clustering assays, TIRF microscopy in vinculin-null MEFs\",\n      \"pmids\": [\"18056416\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Force dependence of head-mediated integrin clustering was not measured\",\n        \"Whether tail-mediated actin coupling requires catch-bond behavior was unknown\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extending vinculin's role beyond focal adhesions, demonstration that vinculin protects VE-cadherin junctions from force-induced opening established it as a mechanosensory effector at endothelial adherens junctions.\",\n      \"evidence\": \"Vinculin-null endothelial cells, α-catenin vinculin-binding-deficient mutant rescue, Rho-Rock inhibition, live-cell tension measurement\",\n      \"pmids\": [\"22391038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How vinculin is activated specifically at cadherin versus integrin adhesions was not resolved\",\n        \"Whether vinculin at adherens junctions recruits Arp2/3 as at focal adhesions was untested\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placing vinculin downstream of ZO-1–JACOP–p114RhoGEF–Rho signaling at endothelial junctions defined the upstream pathway controlling vinculin recruitment to mechanically loaded cadherin complexes.\",\n      \"evidence\": \"siRNA epistasis, FRET tension sensors on VE-cadherin, co-IP, endothelial barrier assays\",\n      \"pmids\": [\"25753039\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether this signaling axis operates at epithelial or other cadherin junctions was not tested\",\n        \"Direct phosphorylation or conformational activation by this pathway was not shown\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"In cardiomyocytes, vinculin was shown to be essential for myofilament maturation by recruiting the SSH1–cofilin axis to regulate F-actin dynamics in response to contractile forces, extending vinculin's function to sarcomere assembly.\",\n      \"evidence\": \"Zebrafish vcl knockout, quantitative interactomics (MS), co-IP of VCL–SSH1–CFL, live imaging of contracting hearts\",\n      \"pmids\": [\"31495694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether SSH1 binding requires vinculin activation or a specific phosphorylation state was not determined\",\n        \"The structural basis for the VCL–SSH1 interaction was not mapped\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of both loss-of-function and gain-of-function VCL variants in human neural tube defects demonstrated that precise vinculin dosage is critical for PCP-dependent morphogenetic cell movements during development.\",\n      \"evidence\": \"Targeted NGS in NTD cohort, PCP pathway reporter assay, migration assays, protein stability analysis\",\n      \"pmids\": [\"33491343\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Variants identified in a single cohort without replication in independent populations\",\n        \"How VCL gain-of-function enhances PCP signaling mechanistically was not resolved\",\n        \"Animal model validation of neural tube phenotype for these specific variants was not performed\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery that tankyrase PARylates vinculin at conserved TBM motifs at epithelial adherens junctions introduced PARylation as a post-translational regulatory mechanism controlling vinculin function and epithelial cell shape.\",\n      \"evidence\": \"PAR affinity precipitation, TBM-II point mutant overexpression induces mesenchymal shape change, TNKS inhibitor treatment\",\n      \"pmids\": [\"34123588\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Specific PARylated residues were not mapped\",\n        \"How PARylation affects vinculin autoinhibition or binding partners was not determined\",\n        \"No loss-of-function genetic approach for endogenous VCL PARylation\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Validation of miR-29a-3p as a direct negative regulator of VCL expression linked miRNA-mediated vinculin downregulation to epithelial barrier disruption in allergic rhinitis, extending vinculin regulation to post-transcriptional control in disease contexts.\",\n      \"evidence\": \"Dual-luciferase 3ʹ-UTR reporter, miR-29a-3p mimic/antagomir, OVA-induced AR mouse model with barrier function rescue\",\n      \"pmids\": [\"37262956\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether miR-29a-3p regulation of VCL operates in other barrier tissues was not tested\",\n        \"Relative contribution of VCL versus CTNNB1 downregulation to barrier loss was not separated\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Evidence that extracellular/plasma VCL levels correlate with vascular leakage and that anti-VCL intervention restores alveolar-capillary barrier integrity in lung injury expanded vinculin's relevance from intracellular mechanotransduction to a potential circulating mediator of vascular pathology.\",\n      \"evidence\": \"Multi-omics proteomics of COVID-19 patient plasma, anti-VCL antibody intervention in rat lung injury model, histology and electron microscopy\",\n      \"pmids\": [\"40268929\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which extracellular VCL promotes vascular leakage is unknown\",\n        \"Whether plasma VCL is actively secreted or a passive release marker was not distinguished\",\n        \"Single preclinical model without independent replication\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis and in vivo dynamics of vinculin's catch-bond with F-actin, whether distinct post-translational modifications (pY822, PARylation) regulate autoinhibition relief or partner selectivity, and the functional significance of alternative VCL splice isoforms generated by RBM10-dependent splicing in cancer cell migration.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Atomic-resolution structure of vinculin's catch bond with actin under force is lacking\",\n        \"Interplay between pY822 phosphorylation and PARylation in regulating cadherin vs. integrin adhesion balance is unexplored\",\n        \"In vivo functional validation of the RBM10-regulated pro-migratory VCL splice isoform beyond preprint data\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 2, 4, 5, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 4, 5, 6]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 2, 4, 5, 10]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 2, 4, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [1, 4, 5, 6]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 6, 8]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8, 9]}\n    ],\n    \"complexes\": [\n      \"Focal adhesion complex\",\n      \"Cadherin–catenin adherens junction complex\"\n    ],\n    \"partners\": [\n      \"TLN1\",\n      \"ACTR2\",\n      \"PXN\",\n      \"CTNNA1\",\n      \"CDH5\",\n      \"SSH1\",\n      \"CFL1\",\n      \"TNKS\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}