{"gene":"VAV1","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":1992,"finding":"p95vav (VAV1) contains an SH2 domain and is a substrate for tyrosine protein kinases; its SH2 domain mediates association with activated EGF and PDGF receptors after ligand stimulation. In T cells, co-activation of TCR and CD4 induces rapid, transient tyrosine phosphorylation of endogenous p95vav. Deletion of the helix-loop-helix-like motif causes oncogenic activation of p95vav.","method":"Co-immunoprecipitation, domain deletion mutagenesis, tyrosine phosphorylation assays in NIH3T3 and T cells","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, domain mutagenesis, multiple cell systems, foundational paper replicated across the field","pmids":["1311423"],"is_preprint":false},{"year":1993,"finding":"Vav immunoprecipitates from human T cell lysates possess guanine nucleotide releasing factor (GRF) activity for Ras-related GTPases; this activity increases after TCR-CD3 triggering in parallel with Vav tyrosine phosphorylation, both of which are blocked by a PTK inhibitor. Vav is also a substrate for the p56lck PTK in vitro.","method":"GRF activity assay on Vav immunoprecipitates, in vitro kinase assay with p56lck, PTK inhibitor studies","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay with biochemical controls, replicated conceptually by multiple labs","pmids":["8484124"],"is_preprint":false},{"year":1994,"finding":"Vav-transformed NIH 3T3 cells maintain well-developed actin stress fibers and focal adhesions (unlike Ras-transformed cells) and do not elevate Ras-GTP levels, indicating Vav transformation is not mediated via Ras activation. Both Vav- and Dbl-transformed cells exhibit constitutively activated MAPKs (primarily ERK2), and kinase-deficient ERK1/2 inhibits Dbl transformation, implicating MAPK activation in Vav-family oncogenicity.","method":"Transformation assays in NIH 3T3 cells, Ras-GTP measurement, MAPK activity assays, dominant-negative kinase expression","journal":"Molecular and Cellular Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical readouts in single lab, genetic epistasis with dominant-negative kinase","pmids":["7935402"],"is_preprint":false},{"year":1995,"finding":"Vav-deficient B and T cells generated by RAG-complementation show severely reduced antigen receptor-mediated proliferative responses in vitro, establishing Vav as required for BCR/TCR-induced proliferation.","method":"RAG-complementation blastocyst injection, vav null ES cells, in vitro proliferation assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic knockout with defined cellular phenotype, independently replicated","pmids":["7700358"],"is_preprint":false},{"year":1995,"finding":"Vav-deficient CD4+CD8+ thymocytes show severely impaired antigen receptor signaling and defective positive selection into mature T cells, but CD4/CD8 lineage commitment is unaffected, placing Vav in TCR-dependent maturation pathways.","method":"RAG-2 blastocyst complementation, flow cytometric analysis of thymic development, functional signaling assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with defined developmental phenotype, epistasis experiment","pmids":["7700360"],"is_preprint":false},{"year":1996,"finding":"Microinjection of Vav into Swiss 3T3 fibroblasts induces actin polymerization and assembly of clustered integrin complexes, and activates Rho, Rac, and Cdc42 GTPases as well as the SAPK/JNK1 MAP kinase cascade, establishing Vav as an upstream GEF regulator of Rho-family GTPases.","method":"Microinjection into Swiss 3T3 fibroblasts, actin staining, GTPase activation assays, SAPK/JNK1 kinase assays","journal":"Current Biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vivo GEF activity demonstrated by microinjection + downstream GTPase activation assays, replicated conceptually","pmids":["8994827"],"is_preprint":false},{"year":1996,"finding":"The Vav SH2 domain is required for its interaction with SLP-76 and for TCR-mediated tyrosine phosphorylation of Vav. Vav and SLP-76 synergistically induce NF-AT and IL-2 gene activation upon TCR stimulation, forming a signaling complex.","method":"Co-immunoprecipitation, SH2 domain mutants, reporter gene assays (NF-AT, IL-2) in Jurkat T cells, overexpression","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with domain mutagenesis, functional reporter assays, replicated independently","pmids":["8673706"],"is_preprint":false},{"year":1997,"finding":"Tyrosine phosphorylation of Vav after BCR crosslinking is positively regulated by CD19 and negatively regulated by CD22, providing a molecular mechanism for adjusting BCR signaling thresholds.","method":"BCR crosslinking in CD19-/- and CD22-/- B cells, immunoprecipitation and anti-phosphotyrosine blotting","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout models with biochemical phosphorylation readout, single lab","pmids":["9371816"],"is_preprint":false},{"year":1997,"finding":"Vav associates constitutively with the PI3K regulatory subunit p85 in erythropoietin-responsive cells; Vav is tyrosine phosphorylated after EPO stimulation via JAK2 (shown by in vitro kinase assay), and both Vav and PI3K are required for EPO-induced cell proliferation.","method":"Co-immunoprecipitation, in vitro PI3K activity assay, antisense vav/p85, in vitro JAK2 kinase assay","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay + Co-IP + antisense knockdown, single lab","pmids":["9162069"],"is_preprint":false},{"year":1997,"finding":"Cbl-b interacts with Vav through Vav's SH3-SH2-SH3 C-terminal domain and Cbl-b's proline-rich sequences; growth factor stimulation increases this affinity, leading to a trimeric complex with activated RTKs. Overexpression of Cbl-b inhibits Vav-mediated JNK activation; this inhibition requires the intact Cbl-b that binds Vav.","method":"Yeast two-hybrid, Co-immunoprecipitation, domain deletion mutants, JNK activity assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by Co-IP, functional JNK assay, single lab","pmids":["9399639"],"is_preprint":false},{"year":1998,"finding":"Vav-deficient T cells show defective TCR-mediated Ca2+ flux, actin polymerization, TCR clustering into patches and caps, NF-ATc1 activation, IL-2 production, and cell cycle progression (p27Kip1 downregulation). Vav constitutively associates with cytoskeletal membrane anchors talin and vinculin. In the absence of Vav, SLP-76 phosphorylation and SLP-76-talin interactions are impaired. TCR-mediated MAPK and SAPK/JNK activation was unaffected.","method":"Vav-/- mouse generation, Ca2+ flux measurements, actin polymerization assays, co-immunoprecipitation (talin, vinculin, SLP-76), cell cycle analysis","journal":"Current Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic knockout, multiple orthogonal assays (Ca2+, actin, Co-IP, cell cycle), independently replicated","pmids":["9601639"],"is_preprint":false},{"year":1998,"finding":"Vav and Rac1 in NK cells regulate cell-mediated killing: Vav tyrosine phosphorylation increases during ADCC and natural killing; overexpression of Vav (but not an exchange-factor-inactive mutant) enhances killing; dominant-negative Rac1 reduces conjugate formation and impairs granule polarization toward target cells.","method":"NK cell cytotoxicity assays, overexpression of wild-type and mutant Vav, dominant-negative Rac1, granule polarization imaging","journal":"Journal of Experimental Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GEF-dead mutant control, functional cytotoxicity and imaging assays, single lab","pmids":["9687532"],"is_preprint":false},{"year":1999,"finding":"HIV-1 Nef binds directly to Vav (identified as the specific Nef binding partner) and activates Vav's GEF activity, leading to cytoskeletal changes (actin rearrangement) and JNK activation. Dominant-negative Vav inhibits Nef-associated kinase (NAK) activation and viral replication.","method":"Co-immunoprecipitation, GEF activity assay, dominant-negative Vav expression, cytoskeletal staining, JNK assay, viral replication assay","journal":"Molecular Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP binding + functional GEF + dominant-negative rescue, single lab","pmids":["10394361"],"is_preprint":false},{"year":1999,"finding":"hSiah2 interacts with Vav in vitro and in vivo (co-localizing in cytoplasm), requiring Vav's SH3 domain and C-terminal region of hSiah2. Overexpression of hSiah2 negatively regulates Vav-induced NFAT-dependent transcription and onco-Vav-induced JNK activation.","method":"Yeast two-hybrid, co-immunoprecipitation, co-localization by microscopy, reporter gene assays (NFAT, JNK)","journal":"Molecular and Cellular Biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus reporter assay, co-localization, single lab with multiple methods","pmids":["10207103"],"is_preprint":false},{"year":2000,"finding":"PKCtheta function is selectively required in a Vav-dependent signaling pathway mediating TCR/CD28-induced JNK activation, IL-2 gene activation, and CD69 upregulation. Vav promotes PKCtheta translocation from cytosol to the T cell membrane/cytoskeleton and activates PKCtheta enzymatically via a pathway dependent on Rac and actin cytoskeleton reorganization.","method":"PKCtheta translocation imaging, PKCtheta kinase activity assays, dominant-negative Rac, actin disruption, reporter gene assays in T cells","journal":"Immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal assays (kinase, imaging, genetics), single lab","pmids":["10714681"],"is_preprint":false},{"year":2000,"finding":"TCR antagonists selectively activate Fyn kinase (but not Lck or ZAP-70), which phosphorylates Vav, and this Fyn-Vav-Rac1 pathway mediates cytoskeletal reorganization required for APC-T cell conjugate formation and immunological synapse. In Fyn-deficient T cells, Vav phosphorylation is deficient.","method":"Fyn-/- TCR transgenic mice, Lck/Fyn variant Jurkat cells, kinase activity assays, T cell-APC conjugate formation assay","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout + variant cell lines + biochemical kinase assays, single lab","pmids":["11005864"],"is_preprint":false},{"year":2000,"finding":"Vav-1 overexpression in combination with CD28 ligation strongly activates NF-AT and permits CD28 alone to activate NF-AT without TCR engagement. This effect requires the intracellular tail of CD28, intact TCR-proximal signaling, the Vav-1 SH2 domain, and SLP-76 phosphorylation (which Vav-1 itself promotes). Vav-1 overexpression also induces lamellipodia/microspikes independent of its SH2 domain.","method":"Overexpression in Jurkat cells, NF-AT reporter assay, anti-phosphotyrosine blotting, dominant-negative/deletion mutants, microscopy","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mutagenesis + reporter assays + cell morphology, single lab, multiple methods","pmids":["11034388"],"is_preprint":false},{"year":2001,"finding":"Vav1 is required for FcεRI-mediated activation of PLCγ1 and PLCγ2 and calcium mobilization in mast cells; it is not required for FcεRI, Syk, or LAT tyrosine phosphorylation. Reconstitution of Vav1-deficient mast cells with Vav1 restores PLCγ phosphorylation and calcium responses, demonstrating a direct role for Vav1 upstream of PLCγ.","method":"Vav1-/- mice, bone marrow-derived mast cell reconstitution, PLCγ phosphorylation assay, Ca2+ mobilization assay","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout + reconstitution rescue, multiple biochemical readouts, independent replication in mast cell context","pmids":["11340169"],"is_preprint":false},{"year":2001,"finding":"Vav1 is required for TCR-induced activation of Rac1 GTPase and forms a signaling complex with Ly-GDI (hematopoietic GDI). Ly-GDI is tyrosine phosphorylated after TCR stimulation and interacts with Shc via its SH2 domain; Ly-GDI-Vav1 interaction requires tyrosine phosphorylation. Co-expression of Ly-GDI enhances Vav1-induced NFAT activation and PLCγ phosphorylation; this cooperativity requires their physical association.","method":"Co-immunoprecipitation, reporter gene assays (NFAT), PLCγ phosphorylation, Ca2+ mobilization, oncogenic Vav1 (non-binding) as control","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with binding-deficient control, functional reporter and biochemical assays, single lab","pmids":["12386169"],"is_preprint":false},{"year":2002,"finding":"Vav1 is required for TCR-induced integrin clustering and MHC/peptide-specific T cell adhesion to APCs. Vav1-deficient thymocytes and T cells show impaired integrin-mediated adhesion to ECM proteins and ICAM-1. Integrin and TCR clustering are controlled by distinct pathways: integrin clustering is Vav1-dependent and WASP-independent.","method":"Vav1-/- mice, adhesion and aggregation assays, peptide-loaded APC systems, comparison with WASP-/- cells","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with defined adhesion phenotype, epistasis with WASP, multiple assays","pmids":["11911819"],"is_preprint":false},{"year":2002,"finding":"Vav1 has a nuclear localization that occurs in a receptor stimulation-dependent manner, requiring the C-terminal SH3 domain and a nuclear localization sequence within the PH domain. Nuclear Vav1 is an integral component of NFAT- and NFκB-like transcriptionally active complexes, with the C-terminal SH3 domain critical for their formation.","method":"Subcellular fractionation, nuclear localization by imaging, chromatin co-immunoprecipitation with NFAT/NFκB complexes, domain deletion mutants","journal":"Journal of Experimental Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with domain mutagenesis and functional transcription complex analysis, single lab","pmids":["11994417"],"is_preprint":false},{"year":2003,"finding":"Cbl ubiquitin ligase mediates Vav ubiquitinylation in a manner requiring Cbl/Vav association through phosphorylated Tyr-700 on Cbl and an intact Cbl RING finger domain; this promotes loss of phosphorylated Vav. Cbl (but not its ubiquitin ligase mutant) inhibits Vav-dependent signaling.","method":"Immortalized T cells from Cbl+/+ and Cbl-/- mice, 293T transfection, ubiquitin assays, RING finger mutant controls","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout + domain mutant controls + ubiquitin assay, single lab","pmids":["12881521"],"is_preprint":false},{"year":2003,"finding":"Vav1 is required for TCR-induced activation of the LFA-1 integrin (inside-out signaling), which explains the defect in conjugate formation with APCs. However, once conjugates form in the absence of Vav1, immunological synapse assembly is normal. Vav1 is required for MTOC polarization but not for synapse protein organization.","method":"Vav1-/- double-positive thymocytes, conjugate formation assays with peptide-loaded APCs, LFA-1 activation assay, MTOC polarization imaging","journal":"European Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout, multiple functional assays, single lab","pmids":["12616499"],"is_preprint":false},{"year":2003,"finding":"Vav1/2/3-null mice produce no functional T or B cells and fail to mount humoral responses. The Vav family is essential for both TCR- and BCR-induced Ca2+ signaling. Vav family is required for MAPK activation in T cells but not in B cells, revealing lineage-specific roles. Vav1 alone is sufficient for normal lymphocyte development; Vav3 plays a compensatory role in T cells.","method":"Triple vav1/2/3 knockout mice, flow cytometry, Ca2+ flux assays, MAPK activation assays, reconstitution experiments","journal":"Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — combinatorial genetic knockouts, multiple orthogonal biochemical assays, single comprehensive study","pmids":["14623913"],"is_preprint":false},{"year":2003,"finding":"Vav1 transduces TCR signals to ERK activation via a pathway involving Ras GTPase and B-Raf, MEK1/2 kinases. Vav1 controls membrane recruitment of two Ras GEFs: RasGRP1 (via PLCγ1) and Sos1/2 (via LAT). Vav1 is required for TCR-induced LAT phosphorylation, which is the key upstream event for both PLCγ1 and Sos1/2 activation.","method":"Vav1-/- double-positive thymocytes, ERK/Ras activation assays, RasGRP1/Sos membrane recruitment assays, LAT phosphorylation assays","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout, multiple pathway components assayed, mechanistic epistasis established","pmids":["14764585"],"is_preprint":false},{"year":2003,"finding":"Vav-1 constitutively associates with IKKα (but not IKKβ) through their helix-loop-helix domains; CD28 engagement increases Vav-1-associated IKKα kinase activity. Vav-1 and IKKα colocalize at the membrane after CD28 stimulation, and Vav-1 promotes NF-κB activation via IKKα.","method":"Co-immunoprecipitation in Jurkat and primary CD4+ T cells, IKKα kinase assay, domain interaction mapping, confocal microscopy, reporter assays","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP + kinase assay + co-localization imaging, single lab","pmids":["12626540"],"is_preprint":false},{"year":2004,"finding":"Vav1 and Vav3 have critical but redundant roles in mediating platelet activation by GPVI collagen receptor: Vav1/Vav3 double-deficient platelets show marked inhibition of aggregation and spreading with reduced PLCγ2 tyrosine phosphorylation. Triple Vav1/2/3-deficient platelets show a similar phenotype to Vav1/3-deficient cells.","method":"Vav1-/-, Vav3-/-, Vav1/3-/-, Vav1/2/3-/- mice, platelet aggregation assay, spreading assay, PLCγ2 phosphorylation","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — combinatorial genetic knockouts with defined biochemical phenotype, redundancy mapping","pmids":["15456756"],"is_preprint":false},{"year":2005,"finding":"Vav1 is ectopically expressed in pancreatic adenocarcinomas due to promoter demethylation. In pancreatic cancer cells, Vav1 acts synergistically with EGFR to stimulate cell proliferation via GEF activity toward Rac1, leading to PAK1 and NF-κB activation and cyclin D1 upregulation. Vav1 RNAi abrogates neoplastic proliferation in vitro and in vivo even in the presence of oncogenic KRAS.","method":"RNAi knockdown, GEF-inactive mutants, in vitro and in vivo tumor growth assays, NF-κB reporter, Rac1 activation assay, bisulfite sequencing","journal":"Cancer Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNAi + GEF-dead mutant + in vivo xenograft + pathway assays, single lab, multiple orthogonal methods","pmids":["15652748"],"is_preprint":false},{"year":2005,"finding":"CXCL12 (chemokine) promotes T lymphocyte α4β1 integrin-dependent adhesion via activation of Vav1 and its downstream effector Rac; siRNA knockdown of Vav1 blocks Rac activation by CXCL12, impairs integrin-dependent adhesion strengthening, and inhibits transendothelial migration.","method":"siRNA knockdown of Vav1, dominant-negative Vav1/Rac, Rac activation assay, flow chamber adhesion assays, transendothelial migration assay","journal":"Molecular Biology of the Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA + dominant-negative + functional adhesion assays, single lab","pmids":["15872091"],"is_preprint":false},{"year":2005,"finding":"Itk is constitutively associated with Vav1; kinase-inactive Itk rescues TCR-induced Vav localization and actin polarization defects caused by Itk siRNA knockdown, demonstrating a kinase-independent scaffolding function of Itk for Vav recruitment to the site of antigen contact. Loss of Itk disrupts Vav-SLP-76 interactions.","method":"siRNA knockdown, kinase-dead/PH/SH2-mutant Itk re-expression, Vav localization imaging, co-immunoprecipitation, membrane-targeted Vav-CAAX rescue","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase-dead rescue + siRNA + Co-IP + localization imaging, single lab","pmids":["15661896"],"is_preprint":false},{"year":2005,"finding":"Vav1 deficiency impairs TCR/CD28-induced Akt phosphorylation and FOXO1 phosphorylation, reducing FOXO1 cytoplasmic localization and its association with 14-3-3τ, resulting in failure to downregulate p27kip1 and causing G0-G1 cell cycle arrest. This places Vav1 in a PI3K/Akt/FOXO1/p27kip1 pathway controlling T cell cycle progression.","method":"Vav1-/- T cells, Akt/FOXO1 phosphorylation assays, 14-3-3τ Co-IP, cell cycle analysis by FACS, p27kip1 expression","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout, multiple pathway components assayed, single lab","pmids":["17015685"],"is_preprint":false},{"year":2006,"finding":"Vav1 is required for DAP10-mediated NK cell cytotoxicity but is not required for ITAM (DAP12/FcRγ)-mediated cytotoxicity; Vav1 interacts with DAP10 YxNM motifs through the adaptor Grb2, and is required for PI3K-dependent Akt signaling and cytoskeletal polarization (actin and microtubule) at the cytolytic synapse.","method":"Vav1-/- and Vav1/DAP12-double-deficient mice, cytotoxicity assays, cytoskeletal polarization imaging, Co-IP of Vav1-Grb2-DAP10, Akt activation assay","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — combinatorial genetic knockouts, Co-IP of complex, multiple orthogonal functional assays, replicated by independent lab (PMID 16582911)","pmids":["16887996","16582911"],"is_preprint":false},{"year":2006,"finding":"NKG2D-DAP10-mediated cytotoxicity in human NK cells requires a DAP10-bound Grb2-Vav1 intermediate; Grb2-Vav1 binding to DAP10 is sufficient to initiate tyrosine phosphorylation events. Full calcium release and cytotoxicity requires both Grb2-Vav1 and PI3K p85 to bind DAP10.","method":"Co-immunoprecipitation of DAP10-Grb2-Vav1 complex, cytotoxicity assays, calcium flux assays with DAP10 mutants","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding complex identification + functional mutant analysis + multiple functional readouts","pmids":["16582911"],"is_preprint":false},{"year":2006,"finding":"Vav1 and Vav3 are specifically required for integrin (complement receptor αMβ2)-mediated phagocytosis in macrophages, controlling Arp2/3 recruitment and actin polymerization at the complement-induced phagosome. Constitutively active Rac rescues actin polymerization and phagocytosis in Vav-deficient macrophages, placing Vav upstream of Rac in this pathway. Vav1/3 is not required for FcγR-mediated phagocytosis.","method":"Vav1-/-, Vav3-/-, Rac1/2-/- primary murine macrophages, phagocytosis assays, Arp2/3 and actin imaging, constitutively active Rac rescue","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple combinatorial knockouts, constitutively active GTPase rescue, mechanistic epistasis","pmids":["16546099"],"is_preprint":false},{"year":2006,"finding":"Vav1 acidic-region tyrosine Tyr174 is required for the maintenance of TCR-signaling microclusters and normal T cell development and activation. The acidic-region tyrosines (Tyr142, Tyr160, Tyr174) conform to SH2-binding motifs and directly bind SH2 domains of Lck, PI3K p85α, and PLCγ1. These tyrosines also regulate Vav1 tyrosine phosphorylation levels. Constitutively activated Vav1 GEF disrupts TCR-signaling microclusters.","method":"Knock-in mice (Vav1 Y174F), microcluster imaging by TIRF/confocal microscopy, SH2 domain binding assays, T cell development assays, Vav1 phosphorylation analysis","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — knock-in mouse + direct SH2-binding assays + microcluster imaging + multiple functional readouts, single comprehensive study","pmids":["17050525"],"is_preprint":false},{"year":2008,"finding":"Crystal structure of Vav1 DH-PH-CRD in complex with Rac1 at 2.6 Å resolution reveals a unique intramolecular network of contacts between the Vav1 cysteine-rich domain (CRD) and the C-terminal helix of the DH domain that stabilizes the DH domain for intimate association with the Switch II region of Rac1, displacing the guanine nucleotide. Mutational analysis confirms the CRD is critical for optimal GEF activity and GTPase specificity breadth.","method":"X-ray crystallography (2.6 Å), SAXS, site-directed mutagenesis + GEF activity assay","journal":"Journal of Molecular Biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure + SAXS solution validation + mutagenesis functional confirmation, single comprehensive study","pmids":["18589439"],"is_preprint":false},{"year":2009,"finding":"Vav1 and Vav3 (but not Vav2) are required for BCR endocytosis and BCR-induced Rac-GTP loading, but not for BCR signaling to MHC-II/CD80 expression or for B cell development/maturation.","method":"Vav1-/-, Vav3-/- B cells, BCR endocytosis assay, Rac activation assay, antigen presentation assay","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockouts, multiple biochemical readouts, single lab","pmids":["19586920"],"is_preprint":false},{"year":2009,"finding":"BCR endocytosis is supported by a sequential pathway: tyrosine phosphorylation of adaptor LAB recruits a Grb2-dynamin complex and Vav; Vav activates Rac1 and Rac2, all of which are required for BCR endocytosis and antigen presentation.","method":"LAB phosphorylation assays, co-immunoprecipitation of LAB-Grb2-Vav complex, Rac activation, BCR endocytosis assay","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — sequential pathway established by Co-IP and functional assays, single lab","pmids":["19858206"],"is_preprint":false},{"year":2009,"finding":"Vav1 is required for Dectin-1-mediated phagocytosis of β-glucan and subsequent superoxide production in microglia; Vav1 functions upstream of PI3K and is required for PI3K activation in this pathway.","method":"Vav1 siRNA knockdown, PI3K activation assay, phagocytosis assay, superoxide production assay, ordering by inhibitor analysis","journal":"Molecular Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown + pathway ordering + two functional readouts, single lab","pmids":["19232731"],"is_preprint":false},{"year":2011,"finding":"Vav1 enters SLP-76 microclusters via its C-terminal SH2 and SH3(B) domains, which bind directly to phosphotyrosines 112 and 128 of SLP-76. Both the C-terminal (SH) and N-terminal (GEF) regions of Vav1 contribute to stabilization of SLP-76 microclusters in a GEF-activity-independent manner. The CH domain and catalytic core of the GEF differentially affect Ca2+ responses.","method":"Live TIRF imaging of microclusters, biophysical Vav1-SLP76 binding measurements, deletion and point mutants, Ca2+ flux assays","journal":"Science Signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct biophysical binding measurements + live imaging + functional mutagenesis, single lab, multiple orthogonal methods","pmids":["21386095"],"is_preprint":false},{"year":2012,"finding":"Vav1 is recruited to immunological synapse microclusters in primary T cells; this recruitment depends on the SH2 and C-terminal SH3 (SH3B) domains of Vav1 and on phosphotyrosines 112 and 128 of SLP-76. These same domains are critical for Vav1 tyrosine phosphorylation and TCR-induced Ca2+ flux.","method":"Live imaging of primary CD4+ and CD8+ T cells, biophysical direct binding assay (Vav1 to SLP76 phosphopeptides), domain deletion/point mutants, Ca2+ flux assays","journal":"Journal of Cell Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct biophysical binding + live primary cell imaging + domain mutagenesis + functional readout, multiple orthogonal methods","pmids":["22956543"],"is_preprint":false},{"year":2013,"finding":"Vav1 is a central regulator of invadopodia assembly in pancreatic tumor cells; its GEF activity toward Cdc42 is required for invadopodia formation. Src-mediated phosphorylation (at Tyr174) activates Vav1 and is sufficient for invadopodia formation; the phosphomimetic Vav1-Y174F drives invadopodia even without Src activation.","method":"siRNA knockdown of Vav1, GEF-inactive and Y174F mutants, invadopodia assay (gelatin degradation), Cdc42 activation, Src inhibitor treatment","journal":"Current Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA + phosphomimetic mutant + GEF-dead control + multiple functional readouts, single lab","pmids":["24332539"],"is_preprint":false},{"year":2013,"finding":"BTK and Vav1 are recruited to Dectin-1-associated phagocytic cups containing Candida albicans; they colocalize with PI(3,4,5)P3 and F-actin. BTK and Vav1-deficient macrophages show defective phagocytosis of C. albicans, and Vav1-/- mice are more susceptible to systemic C. albicans infection.","method":"Co-immunoprecipitation with Dectin-1, confocal localization in phagocytic cups, Vav1-/- macrophages and mice, phagocytosis assay, infection susceptibility","journal":"PLoS Pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout + imaging + in vivo infection, single lab","pmids":["23825946"],"is_preprint":false},{"year":2016,"finding":"Themis1 promotes Vav1 activity in developing thymocytes both in vitro and in vivo by maintaining Grb2 stability; loss of Themis1 reduces Grb2 levels leading to reduced Vav1 activity and impaired T cell development. Proteomic analysis identifies SHP-1, Grb2, and Vav1 as principal Themis1 interacting partners in thymocytes.","method":"Quantitative proteomics of Themis1 interactome, TCR reporter mice, Vav1 activity assays in Themis1-/- and overexpressing thymocytes, Grb2 degradation assay","journal":"Science Signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics + genetic mouse model + in vitro/in vivo Vav1 activity, single lab, multiple methods","pmids":["27188442"],"is_preprint":false},{"year":2016,"finding":"Loss of Vav1 in mesenchymal stem cells (MSCs) reduces Sirt1 levels via Creb, leading to increased acetylation of PPARγ (promoting adipogenesis) and Sox9 (repressing chondrogenesis). Thus Vav1 controls MSC fate decisions between adipocyte and chondrocyte differentiation through a Vav1-Creb-Sirt1 axis.","method":"Vav1-/- mice, ectopic Vav1 expression rescue, Sirt1/PPARγ/Sox9 acetylation and expression assays, Creb phosphorylation, adipogenesis and chondrogenesis assays","journal":"Stem Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout + rescue + pathway epistasis with multiple biochemical assays, single lab","pmids":["26990002"],"is_preprint":false},{"year":2017,"finding":"The G17V RHOA mutant (found in AITL) specifically binds VAV1 and augments its adaptor function through increased phosphorylation of Tyr174, accelerating TCR signaling. VAV1 mutations and a VAV1-STAP2 translocation fusion found in PTCL also augment Tyr174 phosphorylation and TCR signaling.","method":"High-throughput protein binding screen, Co-immunoprecipitation, phospho-VAV1 (Tyr174) Western blot, TCR signaling assays, clinical specimen staining","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — binding screen + Co-IP + phosphorylation assay + functional TCR signaling, single lab","pmids":["28832024"],"is_preprint":false},{"year":2017,"finding":"In peripheral T cell lymphomas, a recurrent in-frame VAV1 deletion (Δ778-786) and VAV1 gene fusions (VAV1-THAP4, VAV1-MYO1F, VAV1-S100A7) result in increased activation of both catalytic-dependent (MAPK, JNK) and non-catalytic-dependent (NFAT) VAV1 effector pathways, supporting a driver oncogenic role.","method":"RNA sequencing, targeted sequencing, MAPK/JNK/NFAT reporter assays in cells expressing the VAV1 variants","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — sequencing-identified variants functionally validated with pathway assays, single lab","pmids":["28062691"],"is_preprint":false},{"year":2005,"finding":"The CRD domain of Vav1/Vav2 plays an active role in both the initial binding event (kon) with Rac1 and the rate-limiting dissociation step (kcat) during guanine nucleotide exchange; Vav2-mediated exchange follows a Theorell-Chance mechanism. NMR chemical shift mapping shows the isolated Vav1 CRD directly associates with Rac1 near the P-loop and guanine base.","method":"In vitro GEF kinetic assays, fluorescence anisotropy, NMR chemical shift mapping, site-directed mutagenesis of Rac1 and CRD","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with kinetic analysis, NMR structural mapping, mutagenesis of both proteins","pmids":["15850391"],"is_preprint":false}],"current_model":"VAV1 is a hematopoietic-specific, tyrosine phosphorylation-regulated guanine nucleotide exchange factor (GEF) for Rho/Rac/Cdc42 GTPases whose catalytic DH domain is allosterically stabilized by its CRD and regulated by phosphorylation of acidic-region Tyr174; upon TCR, BCR, or other immune-receptor stimulation, it is phosphorylated by Lck, Fyn, ZAP-70, and other PTKs, whereupon it is recruited to SLP-76 microclusters at the immunological synapse via its SH2 and C-terminal SH3 domains binding SLP-76 pTyr112/128, and activates downstream cascades including Ca2+/NFAT (via PLCγ activation and LAT phosphorylation), ERK (via RasGRP1 and Sos/LAT), NF-κB (via IKKα and Rac-PKCθ), and actin cytoskeletal reorganization (via Rac1/Cdc42/RhoA) required for integrin activation, phagocytosis, and granule polarization in cytotoxic lymphocytes; it also functions in a GEF-independent scaffolding capacity, translocates to the nucleus to participate in NFAT/NF-κB transcription complexes, and is negatively regulated by Cbl-mediated ubiquitinylation."},"narrative":{"mechanistic_narrative":"VAV1 is a hematopoietic guanine nucleotide exchange factor that couples immune-receptor engagement to Rho-family GTPase activation, cytoskeletal remodeling, and transcriptional programs, and is essential for lymphocyte development and antigen-receptor responses [PMID:8994827, PMID:14623913]. It is a substrate of receptor- and TCR-associated tyrosine kinases—including Lck, Fyn, and JAK2—and its activity rises in parallel with its tyrosine phosphorylation upon receptor triggering [PMID:8484124, PMID:11005864, PMID:9162069]. Phosphorylation of the acidic-region tyrosine Tyr174, together with neighboring tyrosines that conform to SH2-binding motifs and engage Lck, PI3K p85, and PLCγ, relieves autoinhibition and sustains TCR-signaling microclusters [PMID:17050525]. Catalytically, the cysteine-rich domain (CRD) forms an intramolecular network with the DH domain C-terminal helix that stabilizes the catalytic core against the Rac1 Switch II region to displace nucleotide and governs both binding and the rate-limiting exchange step [PMID:18589439, PMID:15850391]. Once activated, VAV1 generates GTP-loaded Rac, Rho, and Cdc42 to drive actin polymerization, integrin clustering and inside-out LFA-1 activation, MTOC/granule polarization in cytotoxic lymphocytes, and phagocytosis [PMID:8994827, PMID:11911819, PMID:12616499, PMID:16546099, PMID:9687532]. VAV1 is recruited to SLP-76 microclusters at the immunological synapse through its C-terminal SH2 and SH3(B) domains binding SLP-76 phosphotyrosines 112 and 128, both as a catalytic GEF and as a GEF-independent scaffold [PMID:21386095, PMID:22956543, PMID:8673706]. Downstream, it controls Ca2+/NFAT signaling via PLCγ and LAT phosphorylation [PMID:11340169, PMID:14764585], ERK activation by recruiting RasGRP1 and Sos1/2 [PMID:14764585], NF-κB through IKKα and a Rac–PKCθ pathway [PMID:12626540, PMID:10714681], and a PI3K/Akt/FOXO1 axis governing cell-cycle progression [PMID:17015685]. VAV1 additionally translocates to the nucleus, where it is an integral component of NFAT- and NF-κB-like transcription complexes [PMID:11994417], and it is negatively regulated by Cbl-mediated ubiquitinylation that degrades the phosphorylated protein [PMID:12881521]. Aberrant VAV1—ectopic expression in pancreatic carcinoma and recurrent mutations, deletions, and fusions in peripheral T cell lymphomas—acts as an oncogenic driver by augmenting catalytic and scaffolding effector pathways [PMID:15652748, PMID:28832024, PMID:28062691].","teleology":[{"year":1992,"claim":"Established VAV1 as an SH2-containing tyrosine-kinase substrate linking receptor activation to signaling and identified its oncogenic potential, framing the central question of how phosphorylation controls its activity.","evidence":"Co-IP with activated EGF/PDGF receptors and TCR/CD4 co-activation phosphorylation, plus oncogenic activation by HLH-motif deletion in NIH3T3 and T cells","pmids":["1311423"],"confidence":"High","gaps":["Did not define the catalytic enzymatic activity","Mechanism of phosphorylation-dependent activation unresolved"]},{"year":1993,"claim":"Showed VAV1 immunoprecipitates carry nucleotide-releasing activity for Ras-related GTPases that rises with TCR-triggered phosphorylation, first connecting receptor signaling to GEF function.","evidence":"GRF activity assays on Vav immunoprecipitates with PTK-inhibitor controls and in vitro Lck kinase assay","pmids":["8484124"],"confidence":"High","gaps":["Specific GTPase substrates not defined","Activity from immunoprecipitates, not purified protein"]},{"year":1996,"claim":"Defined VAV1 as a direct upstream GEF for Rho-family GTPases driving actin polymerization and JNK signaling, establishing the cytoskeletal effector arm.","evidence":"Microinjection into Swiss 3T3 fibroblasts with actin staining, Rho/Rac/Cdc42 activation and SAPK/JNK1 assays","pmids":["8994827"],"confidence":"High","gaps":["Did not resolve domain basis of catalytic activation","Tested in fibroblasts rather than native hematopoietic cells"]},{"year":1996,"claim":"Identified the SH2-dependent VAV1–SLP-76 interaction required for VAV1 phosphorylation and synergistic NF-AT/IL-2 activation, anchoring VAV1 in the TCR signalosome.","evidence":"Co-IP, SH2 mutants, and NF-AT/IL-2 reporter assays in Jurkat cells","pmids":["8673706"],"confidence":"High","gaps":["Did not map the SLP-76 phosphosites engaged","Scaffolding versus catalytic contributions not separated"]},{"year":1995,"claim":"Genetic ablation established VAV1 as essential for antigen-receptor-induced proliferation, thymocyte positive selection, and lymphocyte development.","evidence":"RAG-complementation knockout ES cells, proliferation assays, and flow-cytometric thymic analysis","pmids":["7700358","7700360"],"confidence":"High","gaps":["Did not distinguish which downstream pathway accounts for the developmental defect","Compensation by paralogs not assessed"]},{"year":1998,"claim":"Defined the VAV1-dependent TCR effector branch—Ca2+ flux, actin/TCR clustering, NFATc1, IL-2, and cell-cycle entry—and its association with cytoskeletal anchors, separating it from MAPK/JNK in T cells.","evidence":"Vav1-/- mice with Ca2+, actin, cell-cycle assays and Co-IP of talin/vinculin/SLP-76","pmids":["9601639"],"confidence":"High","gaps":["Did not establish whether Ca2+ defect is catalytic or scaffolding","MAPK independence in T cells later revised by combinatorial knockouts"]},{"year":1998,"claim":"Extended VAV1–Rac signaling to NK-cell killing, linking GEF activity to granule polarization and conjugate formation.","evidence":"NK cytotoxicity assays with WT and exchange-dead Vav and dominant-negative Rac1","pmids":["9687532"],"confidence":"Medium","gaps":["Single lab; overexpression-based","Receptor coupling to Vav not defined"]},{"year":2001,"claim":"Reconstitution showed VAV1 acts directly upstream of PLCγ for FcεRI-driven calcium mobilization in mast cells, generalizing its role across immunoreceptors.","evidence":"Vav1-/- mast cell reconstitution with PLCγ phosphorylation and Ca2+ assays","pmids":["11340169"],"confidence":"High","gaps":["Mechanism by which Vav1 promotes PLCγ phosphorylation not resolved here","Catalytic requirement not tested with GEF-dead mutant"]},{"year":2002,"claim":"Demonstrated a nuclear, transcription-complex role for VAV1 dependent on its C-terminal SH3 domain, establishing a function beyond cytoplasmic GEF signaling.","evidence":"Subcellular fractionation, imaging, and chromatin Co-IP with NFAT/NF-κB complexes using domain mutants","pmids":["11994417"],"confidence":"Medium","gaps":["Direct DNA or transcription-factor contacts not defined","Single lab"]},{"year":2002,"claim":"Resolved that VAV1 controls integrin clustering and inside-out LFA-1 activation and MTOC polarization, distinct from synapse protein organization, defining its adhesion role.","evidence":"Vav1-/- thymocytes with adhesion, LFA-1 activation, conjugate and MTOC polarization assays, WASP comparison","pmids":["11911819","12616499"],"confidence":"High","gaps":["GTPase mediating integrin activation not fully defined here","Inside-out signaling intermediates unmapped"]},{"year":2003,"claim":"Combinatorial Vav1/2/3 knockouts proved the family is essential for lymphocyte development and antigen-receptor Ca2+ signaling and revealed lineage-specific MAPK dependence and paralog redundancy.","evidence":"Triple knockout mice with flow cytometry, Ca2+ flux, and MAPK assays","pmids":["14623913"],"confidence":"High","gaps":["Did not isolate unique non-redundant Vav1 functions in all settings","Molecular basis of B- versus T-cell MAPK difference unresolved"]},{"year":2003,"claim":"Mapped the VAV1-to-ERK route via LAT phosphorylation controlling RasGRP1 (through PLCγ) and Sos1/2 recruitment, and the VAV1–IKKα/PKCθ route to NF-κB, defining parallel transcriptional effector arms.","evidence":"Vav1-/- thymocytes with ERK/Ras and membrane-recruitment assays; Co-IP and kinase assays of Vav1–IKKα; PKCθ translocation/kinase assays","pmids":["14764585","12626540","10714681"],"confidence":"High","gaps":["Whether LAT phosphorylation control is direct or cytoskeleton-dependent unresolved","Quantitative contribution of each arm to outcomes not weighted"]},{"year":2003,"claim":"Identified Cbl-mediated ubiquitinylation as the negative regulatory mechanism degrading phosphorylated VAV1, closing the activation loop.","evidence":"Cbl-/- T cells and 293T ubiquitin assays with RING-finger mutant controls","pmids":["12881521"],"confidence":"Medium","gaps":["Degradation route (proteasomal/lysosomal) and kinetics not detailed","Single lab"]},{"year":2005,"claim":"Kinetic and NMR analyses established that the CRD actively participates in both Rac1 binding and the rate-limiting exchange step, mechanistically defining the catalytic cycle.","evidence":"In vitro GEF kinetics, fluorescence anisotropy, NMR chemical shift mapping, and mutagenesis","pmids":["15850391"],"confidence":"High","gaps":["Did not provide a full-length autoinhibited structure","Phosphorylation-coupled conformational change not directly observed"]},{"year":2005,"claim":"Connected VAV1 to chemokine and growth-factor receptor inputs—CXCL12-driven integrin adhesion/migration, EPO/PI3K proliferation—and to PI3K/Akt/FOXO1 control of cell-cycle progression, broadening its receptor coupling.","evidence":"siRNA/dominant-negative Vav1 with Rac and adhesion/migration assays; p85 Co-IP and JAK2 kinase assay; Akt/FOXO1/14-3-3 and cell-cycle assays in Vav1-/- T cells","pmids":["15872091","9162069","17015685"],"confidence":"Medium","gaps":["Direct versus indirect coupling to PI3K/Akt not fully resolved","Several findings single-lab"]},{"year":2006,"claim":"Defined receptor-selective VAV1 requirements in innate effectors: DAP10/NKG2D cytotoxicity via a Grb2-VAV1 intermediate, and integrin-receptor (but not FcγR) phagocytosis via Rac-driven Arp2/3 actin assembly.","evidence":"Combinatorial knockout NK cells and macrophages, Co-IP of DAP10-Grb2-Vav1, cytotoxicity/phagocytosis assays, constitutively active Rac rescue","pmids":["16887996","16582911","16546099"],"confidence":"High","gaps":["Basis of ITAM versus DAP10 selectivity not fully defined","Quantitative GTPase requirements across receptors unmapped"]},{"year":2008,"claim":"The DH-PH-CRD–Rac1 crystal structure revealed the CRD–DH intramolecular network that stabilizes the catalytic core for Switch-II engagement and nucleotide displacement, providing the structural basis of catalysis and substrate breadth.","evidence":"X-ray crystallography at 2.6 Å, SAXS, and mutagenesis with GEF assays","pmids":["18589439"],"confidence":"High","gaps":["Did not capture the phosphoregulatory acidic region in context","Full autoinhibited conformation not solved"]},{"year":2006,"claim":"Knock-in analysis established acidic-region Tyr174 (and Tyr142/Tyr160) as direct SH2-binding sites for Lck, PI3K p85, and PLCγ that sustain TCR microclusters and tune VAV1 phosphorylation, defining the phosphoregulatory switch.","evidence":"Vav1 Y174F knock-in mice, microcluster imaging, SH2-binding assays, development and phosphorylation analyses","pmids":["17050525"],"confidence":"High","gaps":["Order of de-repression versus partner recruitment not resolved","Quantitative coupling of each tyrosine to effector arms unmeasured"]},{"year":2012,"claim":"Live-imaging and biophysical studies pinpointed that VAV1 enters SLP-76 microclusters via SH2/SH3(B) binding to SLP-76 pTyr112/128 and contributes both catalytically and as a GEF-independent scaffold, unifying its synapse recruitment mechanism.","evidence":"TIRF imaging in primary T cells, direct phosphopeptide binding measurements, domain mutants, and Ca2+ flux assays","pmids":["21386095","22956543"],"confidence":"High","gaps":["Relative weighting of scaffolding versus GEF outputs context-dependent and unresolved","Stoichiometry within microclusters not defined"]},{"year":2016,"claim":"Identified upstream regulators (Themis1 via Grb2 stability) and non-hematopoietic roles (a Vav1-Creb-Sirt1 axis governing MSC fate), broadening the regulatory network.","evidence":"Themis1 interactome proteomics with knockout/overexpression Vav1 activity assays; Vav1-/- MSC differentiation with Sirt1/PPARγ/Sox9 acetylation assays","pmids":["27188442","26990002"],"confidence":"Medium","gaps":["MSC axis single lab and mechanistically indirect","Generality of non-hematopoietic VAV1 function unclear"]},{"year":2017,"claim":"Established VAV1 as an oncogenic driver: ectopic expression in pancreatic carcinoma and recurrent T-cell-lymphoma mutations, deletions, and fusions augment Tyr174 phosphorylation and both catalytic and scaffolding effector pathways.","evidence":"RNAi/GEF-dead/in vivo tumor assays in pancreatic cells; binding screens, Co-IP, phospho-Tyr174 blots, and MAPK/JNK/NFAT reporter assays for lymphoma variants and RHOA G17V","pmids":["15652748","28832024","28062691"],"confidence":"High","gaps":["Whether all variants act through a common conformational mechanism unresolved","No direct VAV1-targeted therapeutic validation"]},{"year":null,"claim":"How phosphorylation of the acidic region is structurally coupled to relief of CRD-stabilized autoinhibition in full-length VAV1, and how catalytic versus scaffolding outputs are quantitatively partitioned across different receptors, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No full-length autoinhibited structure with the acidic region","Effector-arm partitioning not quantified per receptor context"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,5,35,47]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,35,47]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6,39,40,25]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[20]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[14,13]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[14,25,39,40]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[20]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3,4,23,17,24,33]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,5,24,25,28]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,20,24,25]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[27,45,46]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[26]}],"complexes":["SLP-76 microcluster","DAP10-Grb2-Vav1 complex","LAB-Grb2-Vav-dynamin complex"],"partners":["SLP76","GRB2","PIK3R1","LCK","FYN","CBL","DAP10","ITK"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P15498","full_name":"Proto-oncogene vav","aliases":[],"length_aa":845,"mass_kda":98.3,"function":"Couples tyrosine kinase signals with the activation of the Rho/Rac GTPases, thus leading to cell differentiation and/or proliferation","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/P15498/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/VAV1","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/VAV1","total_profiled":1310},"omim":[{"mim_id":"617891","title":"ZINC FINGER PROTEIN 655; ZNF655","url":"https://www.omim.org/entry/617891"},{"mim_id":"611817","title":"KILLER CELL LECTIN-LIKE RECEPTOR, SUBFAMILY K, MEMBER 1; KLRK1","url":"https://www.omim.org/entry/611817"},{"mim_id":"606784","title":"GLYCOGEN SYNTHASE KINASE 3-ALPHA; GSK3A","url":"https://www.omim.org/entry/606784"},{"mim_id":"605554","title":"CD244 ANTIGEN; CD244","url":"https://www.omim.org/entry/605554"},{"mim_id":"605541","title":"VAV GUANINE NUCLEOTIDE EXCHANGE FACTOR 3; VAV3","url":"https://www.omim.org/entry/605541"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":51.1},{"tissue":"lymphoid tissue","ntpm":43.5}],"url":"https://www.proteinatlas.org/search/VAV1"},"hgnc":{"alias_symbol":[],"prev_symbol":["VAV"]},"alphafold":{"accession":"P15498","domains":[{"cath_id":"1.10.418.10","chopping":"2-164","consensus_level":"high","plddt":86.7529,"start":2,"end":164},{"cath_id":"1.20.900.10","chopping":"168-179_189-374","consensus_level":"high","plddt":92.7396,"start":168,"end":374},{"cath_id":"2.30.29.30","chopping":"392-505","consensus_level":"high","plddt":91.8925,"start":392,"end":505},{"cath_id":"3.30.60.20","chopping":"511-563","consensus_level":"medium","plddt":93.8932,"start":511,"end":563},{"cath_id":"2.30.30.40","chopping":"595-656","consensus_level":"high","plddt":87.8256,"start":595,"end":656},{"cath_id":"3.30.505.10","chopping":"671-763","consensus_level":"high","plddt":91.4009,"start":671,"end":763},{"cath_id":"2.30.30.40","chopping":"784-839","consensus_level":"high","plddt":88.9857,"start":784,"end":839}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P15498","model_url":"https://alphafold.ebi.ac.uk/files/AF-P15498-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P15498-F1-predicted_aligned_error_v6.png","plddt_mean":86.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VAV1","jax_strain_url":"https://www.jax.org/strain/search?query=VAV1"},"sequence":{"accession":"P15498","fasta_url":"https://rest.uniprot.org/uniprotkb/P15498.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P15498/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P15498"}},"corpus_meta":[{"pmid":"7700358","id":"PMC_7700358","title":"Defective antigen receptor-mediated proliferation of B and T cells in the absence of Vav.","date":"1995","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/7700358","citation_count":372,"is_preprint":false},{"pmid":"9601639","id":"PMC_9601639","title":"Vav is a regulator of cytoskeletal reorganization mediated by the T-cell receptor.","date":"1998","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/9601639","citation_count":348,"is_preprint":false},{"pmid":"1311423","id":"PMC_1311423","title":"Product of vav proto-oncogene defines a new class of tyrosine protein kinase substrates.","date":"1992","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/1311423","citation_count":302,"is_preprint":false},{"pmid":"8484124","id":"PMC_8484124","title":"Tyrosine kinase-stimulated guanine nucleotide exchange activity of Vav in T cell activation.","date":"1993","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/8484124","citation_count":297,"is_preprint":false},{"pmid":"8673706","id":"PMC_8673706","title":"Vav and SLP-76 interact and functionally cooperate in IL-2 gene activation.","date":"1996","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/8673706","citation_count":286,"is_preprint":false},{"pmid":"7700360","id":"PMC_7700360","title":"Defective T-cell receptor signalling and positive selection of Vav-deficient CD4+ CD8+ thymocytes.","date":"1995","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/7700360","citation_count":282,"is_preprint":false},{"pmid":"15886116","id":"PMC_15886116","title":"Vav-family proteins in T-cell signalling.","date":"2005","source":"Current opinion in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/15886116","citation_count":272,"is_preprint":false},{"pmid":"12094222","id":"PMC_12094222","title":"VAV proteins as signal integrators for multi-subunit immune-recognition receptors.","date":"2002","source":"Nature reviews. 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(VAV1) contains an SH2 domain and is a substrate for tyrosine protein kinases; its SH2 domain mediates association with activated EGF and PDGF receptors after ligand stimulation. In T cells, co-activation of TCR and CD4 induces rapid, transient tyrosine phosphorylation of endogenous p95vav. Deletion of the helix-loop-helix-like motif causes oncogenic activation of p95vav.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion mutagenesis, tyrosine phosphorylation assays in NIH3T3 and T cells\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, domain mutagenesis, multiple cell systems, foundational paper replicated across the field\",\n      \"pmids\": [\"1311423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Vav immunoprecipitates from human T cell lysates possess guanine nucleotide releasing factor (GRF) activity for Ras-related GTPases; this activity increases after TCR-CD3 triggering in parallel with Vav tyrosine phosphorylation, both of which are blocked by a PTK inhibitor. Vav is also a substrate for the p56lck PTK in vitro.\",\n      \"method\": \"GRF activity assay on Vav immunoprecipitates, in vitro kinase assay with p56lck, PTK inhibitor studies\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assay with biochemical controls, replicated conceptually by multiple labs\",\n      \"pmids\": [\"8484124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Vav-transformed NIH 3T3 cells maintain well-developed actin stress fibers and focal adhesions (unlike Ras-transformed cells) and do not elevate Ras-GTP levels, indicating Vav transformation is not mediated via Ras activation. Both Vav- and Dbl-transformed cells exhibit constitutively activated MAPKs (primarily ERK2), and kinase-deficient ERK1/2 inhibits Dbl transformation, implicating MAPK activation in Vav-family oncogenicity.\",\n      \"method\": \"Transformation assays in NIH 3T3 cells, Ras-GTP measurement, MAPK activity assays, dominant-negative kinase expression\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical readouts in single lab, genetic epistasis with dominant-negative kinase\",\n      \"pmids\": [\"7935402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Vav-deficient B and T cells generated by RAG-complementation show severely reduced antigen receptor-mediated proliferative responses in vitro, establishing Vav as required for BCR/TCR-induced proliferation.\",\n      \"method\": \"RAG-complementation blastocyst injection, vav null ES cells, in vitro proliferation assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic knockout with defined cellular phenotype, independently replicated\",\n      \"pmids\": [\"7700358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Vav-deficient CD4+CD8+ thymocytes show severely impaired antigen receptor signaling and defective positive selection into mature T cells, but CD4/CD8 lineage commitment is unaffected, placing Vav in TCR-dependent maturation pathways.\",\n      \"method\": \"RAG-2 blastocyst complementation, flow cytometric analysis of thymic development, functional signaling assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with defined developmental phenotype, epistasis experiment\",\n      \"pmids\": [\"7700360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Microinjection of Vav into Swiss 3T3 fibroblasts induces actin polymerization and assembly of clustered integrin complexes, and activates Rho, Rac, and Cdc42 GTPases as well as the SAPK/JNK1 MAP kinase cascade, establishing Vav as an upstream GEF regulator of Rho-family GTPases.\",\n      \"method\": \"Microinjection into Swiss 3T3 fibroblasts, actin staining, GTPase activation assays, SAPK/JNK1 kinase assays\",\n      \"journal\": \"Current Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vivo GEF activity demonstrated by microinjection + downstream GTPase activation assays, replicated conceptually\",\n      \"pmids\": [\"8994827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The Vav SH2 domain is required for its interaction with SLP-76 and for TCR-mediated tyrosine phosphorylation of Vav. Vav and SLP-76 synergistically induce NF-AT and IL-2 gene activation upon TCR stimulation, forming a signaling complex.\",\n      \"method\": \"Co-immunoprecipitation, SH2 domain mutants, reporter gene assays (NF-AT, IL-2) in Jurkat T cells, overexpression\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with domain mutagenesis, functional reporter assays, replicated independently\",\n      \"pmids\": [\"8673706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Tyrosine phosphorylation of Vav after BCR crosslinking is positively regulated by CD19 and negatively regulated by CD22, providing a molecular mechanism for adjusting BCR signaling thresholds.\",\n      \"method\": \"BCR crosslinking in CD19-/- and CD22-/- B cells, immunoprecipitation and anti-phosphotyrosine blotting\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout models with biochemical phosphorylation readout, single lab\",\n      \"pmids\": [\"9371816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Vav associates constitutively with the PI3K regulatory subunit p85 in erythropoietin-responsive cells; Vav is tyrosine phosphorylated after EPO stimulation via JAK2 (shown by in vitro kinase assay), and both Vav and PI3K are required for EPO-induced cell proliferation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro PI3K activity assay, antisense vav/p85, in vitro JAK2 kinase assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay + Co-IP + antisense knockdown, single lab\",\n      \"pmids\": [\"9162069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Cbl-b interacts with Vav through Vav's SH3-SH2-SH3 C-terminal domain and Cbl-b's proline-rich sequences; growth factor stimulation increases this affinity, leading to a trimeric complex with activated RTKs. Overexpression of Cbl-b inhibits Vav-mediated JNK activation; this inhibition requires the intact Cbl-b that binds Vav.\",\n      \"method\": \"Yeast two-hybrid, Co-immunoprecipitation, domain deletion mutants, JNK activity assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by Co-IP, functional JNK assay, single lab\",\n      \"pmids\": [\"9399639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Vav-deficient T cells show defective TCR-mediated Ca2+ flux, actin polymerization, TCR clustering into patches and caps, NF-ATc1 activation, IL-2 production, and cell cycle progression (p27Kip1 downregulation). Vav constitutively associates with cytoskeletal membrane anchors talin and vinculin. In the absence of Vav, SLP-76 phosphorylation and SLP-76-talin interactions are impaired. TCR-mediated MAPK and SAPK/JNK activation was unaffected.\",\n      \"method\": \"Vav-/- mouse generation, Ca2+ flux measurements, actin polymerization assays, co-immunoprecipitation (talin, vinculin, SLP-76), cell cycle analysis\",\n      \"journal\": \"Current Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic knockout, multiple orthogonal assays (Ca2+, actin, Co-IP, cell cycle), independently replicated\",\n      \"pmids\": [\"9601639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Vav and Rac1 in NK cells regulate cell-mediated killing: Vav tyrosine phosphorylation increases during ADCC and natural killing; overexpression of Vav (but not an exchange-factor-inactive mutant) enhances killing; dominant-negative Rac1 reduces conjugate formation and impairs granule polarization toward target cells.\",\n      \"method\": \"NK cell cytotoxicity assays, overexpression of wild-type and mutant Vav, dominant-negative Rac1, granule polarization imaging\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GEF-dead mutant control, functional cytotoxicity and imaging assays, single lab\",\n      \"pmids\": [\"9687532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"HIV-1 Nef binds directly to Vav (identified as the specific Nef binding partner) and activates Vav's GEF activity, leading to cytoskeletal changes (actin rearrangement) and JNK activation. Dominant-negative Vav inhibits Nef-associated kinase (NAK) activation and viral replication.\",\n      \"method\": \"Co-immunoprecipitation, GEF activity assay, dominant-negative Vav expression, cytoskeletal staining, JNK assay, viral replication assay\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP binding + functional GEF + dominant-negative rescue, single lab\",\n      \"pmids\": [\"10394361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"hSiah2 interacts with Vav in vitro and in vivo (co-localizing in cytoplasm), requiring Vav's SH3 domain and C-terminal region of hSiah2. Overexpression of hSiah2 negatively regulates Vav-induced NFAT-dependent transcription and onco-Vav-induced JNK activation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, co-localization by microscopy, reporter gene assays (NFAT, JNK)\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus reporter assay, co-localization, single lab with multiple methods\",\n      \"pmids\": [\"10207103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"PKCtheta function is selectively required in a Vav-dependent signaling pathway mediating TCR/CD28-induced JNK activation, IL-2 gene activation, and CD69 upregulation. Vav promotes PKCtheta translocation from cytosol to the T cell membrane/cytoskeleton and activates PKCtheta enzymatically via a pathway dependent on Rac and actin cytoskeleton reorganization.\",\n      \"method\": \"PKCtheta translocation imaging, PKCtheta kinase activity assays, dominant-negative Rac, actin disruption, reporter gene assays in T cells\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal assays (kinase, imaging, genetics), single lab\",\n      \"pmids\": [\"10714681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"TCR antagonists selectively activate Fyn kinase (but not Lck or ZAP-70), which phosphorylates Vav, and this Fyn-Vav-Rac1 pathway mediates cytoskeletal reorganization required for APC-T cell conjugate formation and immunological synapse. In Fyn-deficient T cells, Vav phosphorylation is deficient.\",\n      \"method\": \"Fyn-/- TCR transgenic mice, Lck/Fyn variant Jurkat cells, kinase activity assays, T cell-APC conjugate formation assay\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout + variant cell lines + biochemical kinase assays, single lab\",\n      \"pmids\": [\"11005864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Vav-1 overexpression in combination with CD28 ligation strongly activates NF-AT and permits CD28 alone to activate NF-AT without TCR engagement. This effect requires the intracellular tail of CD28, intact TCR-proximal signaling, the Vav-1 SH2 domain, and SLP-76 phosphorylation (which Vav-1 itself promotes). Vav-1 overexpression also induces lamellipodia/microspikes independent of its SH2 domain.\",\n      \"method\": \"Overexpression in Jurkat cells, NF-AT reporter assay, anti-phosphotyrosine blotting, dominant-negative/deletion mutants, microscopy\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mutagenesis + reporter assays + cell morphology, single lab, multiple methods\",\n      \"pmids\": [\"11034388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Vav1 is required for FcεRI-mediated activation of PLCγ1 and PLCγ2 and calcium mobilization in mast cells; it is not required for FcεRI, Syk, or LAT tyrosine phosphorylation. Reconstitution of Vav1-deficient mast cells with Vav1 restores PLCγ phosphorylation and calcium responses, demonstrating a direct role for Vav1 upstream of PLCγ.\",\n      \"method\": \"Vav1-/- mice, bone marrow-derived mast cell reconstitution, PLCγ phosphorylation assay, Ca2+ mobilization assay\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout + reconstitution rescue, multiple biochemical readouts, independent replication in mast cell context\",\n      \"pmids\": [\"11340169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Vav1 is required for TCR-induced activation of Rac1 GTPase and forms a signaling complex with Ly-GDI (hematopoietic GDI). Ly-GDI is tyrosine phosphorylated after TCR stimulation and interacts with Shc via its SH2 domain; Ly-GDI-Vav1 interaction requires tyrosine phosphorylation. Co-expression of Ly-GDI enhances Vav1-induced NFAT activation and PLCγ phosphorylation; this cooperativity requires their physical association.\",\n      \"method\": \"Co-immunoprecipitation, reporter gene assays (NFAT), PLCγ phosphorylation, Ca2+ mobilization, oncogenic Vav1 (non-binding) as control\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with binding-deficient control, functional reporter and biochemical assays, single lab\",\n      \"pmids\": [\"12386169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Vav1 is required for TCR-induced integrin clustering and MHC/peptide-specific T cell adhesion to APCs. Vav1-deficient thymocytes and T cells show impaired integrin-mediated adhesion to ECM proteins and ICAM-1. Integrin and TCR clustering are controlled by distinct pathways: integrin clustering is Vav1-dependent and WASP-independent.\",\n      \"method\": \"Vav1-/- mice, adhesion and aggregation assays, peptide-loaded APC systems, comparison with WASP-/- cells\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with defined adhesion phenotype, epistasis with WASP, multiple assays\",\n      \"pmids\": [\"11911819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Vav1 has a nuclear localization that occurs in a receptor stimulation-dependent manner, requiring the C-terminal SH3 domain and a nuclear localization sequence within the PH domain. Nuclear Vav1 is an integral component of NFAT- and NFκB-like transcriptionally active complexes, with the C-terminal SH3 domain critical for their formation.\",\n      \"method\": \"Subcellular fractionation, nuclear localization by imaging, chromatin co-immunoprecipitation with NFAT/NFκB complexes, domain deletion mutants\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with domain mutagenesis and functional transcription complex analysis, single lab\",\n      \"pmids\": [\"11994417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Cbl ubiquitin ligase mediates Vav ubiquitinylation in a manner requiring Cbl/Vav association through phosphorylated Tyr-700 on Cbl and an intact Cbl RING finger domain; this promotes loss of phosphorylated Vav. Cbl (but not its ubiquitin ligase mutant) inhibits Vav-dependent signaling.\",\n      \"method\": \"Immortalized T cells from Cbl+/+ and Cbl-/- mice, 293T transfection, ubiquitin assays, RING finger mutant controls\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout + domain mutant controls + ubiquitin assay, single lab\",\n      \"pmids\": [\"12881521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Vav1 is required for TCR-induced activation of the LFA-1 integrin (inside-out signaling), which explains the defect in conjugate formation with APCs. However, once conjugates form in the absence of Vav1, immunological synapse assembly is normal. Vav1 is required for MTOC polarization but not for synapse protein organization.\",\n      \"method\": \"Vav1-/- double-positive thymocytes, conjugate formation assays with peptide-loaded APCs, LFA-1 activation assay, MTOC polarization imaging\",\n      \"journal\": \"European Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout, multiple functional assays, single lab\",\n      \"pmids\": [\"12616499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Vav1/2/3-null mice produce no functional T or B cells and fail to mount humoral responses. The Vav family is essential for both TCR- and BCR-induced Ca2+ signaling. Vav family is required for MAPK activation in T cells but not in B cells, revealing lineage-specific roles. Vav1 alone is sufficient for normal lymphocyte development; Vav3 plays a compensatory role in T cells.\",\n      \"method\": \"Triple vav1/2/3 knockout mice, flow cytometry, Ca2+ flux assays, MAPK activation assays, reconstitution experiments\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — combinatorial genetic knockouts, multiple orthogonal biochemical assays, single comprehensive study\",\n      \"pmids\": [\"14623913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Vav1 transduces TCR signals to ERK activation via a pathway involving Ras GTPase and B-Raf, MEK1/2 kinases. Vav1 controls membrane recruitment of two Ras GEFs: RasGRP1 (via PLCγ1) and Sos1/2 (via LAT). Vav1 is required for TCR-induced LAT phosphorylation, which is the key upstream event for both PLCγ1 and Sos1/2 activation.\",\n      \"method\": \"Vav1-/- double-positive thymocytes, ERK/Ras activation assays, RasGRP1/Sos membrane recruitment assays, LAT phosphorylation assays\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout, multiple pathway components assayed, mechanistic epistasis established\",\n      \"pmids\": [\"14764585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Vav-1 constitutively associates with IKKα (but not IKKβ) through their helix-loop-helix domains; CD28 engagement increases Vav-1-associated IKKα kinase activity. Vav-1 and IKKα colocalize at the membrane after CD28 stimulation, and Vav-1 promotes NF-κB activation via IKKα.\",\n      \"method\": \"Co-immunoprecipitation in Jurkat and primary CD4+ T cells, IKKα kinase assay, domain interaction mapping, confocal microscopy, reporter assays\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP + kinase assay + co-localization imaging, single lab\",\n      \"pmids\": [\"12626540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Vav1 and Vav3 have critical but redundant roles in mediating platelet activation by GPVI collagen receptor: Vav1/Vav3 double-deficient platelets show marked inhibition of aggregation and spreading with reduced PLCγ2 tyrosine phosphorylation. Triple Vav1/2/3-deficient platelets show a similar phenotype to Vav1/3-deficient cells.\",\n      \"method\": \"Vav1-/-, Vav3-/-, Vav1/3-/-, Vav1/2/3-/- mice, platelet aggregation assay, spreading assay, PLCγ2 phosphorylation\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — combinatorial genetic knockouts with defined biochemical phenotype, redundancy mapping\",\n      \"pmids\": [\"15456756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Vav1 is ectopically expressed in pancreatic adenocarcinomas due to promoter demethylation. In pancreatic cancer cells, Vav1 acts synergistically with EGFR to stimulate cell proliferation via GEF activity toward Rac1, leading to PAK1 and NF-κB activation and cyclin D1 upregulation. Vav1 RNAi abrogates neoplastic proliferation in vitro and in vivo even in the presence of oncogenic KRAS.\",\n      \"method\": \"RNAi knockdown, GEF-inactive mutants, in vitro and in vivo tumor growth assays, NF-κB reporter, Rac1 activation assay, bisulfite sequencing\",\n      \"journal\": \"Cancer Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNAi + GEF-dead mutant + in vivo xenograft + pathway assays, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"15652748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CXCL12 (chemokine) promotes T lymphocyte α4β1 integrin-dependent adhesion via activation of Vav1 and its downstream effector Rac; siRNA knockdown of Vav1 blocks Rac activation by CXCL12, impairs integrin-dependent adhesion strengthening, and inhibits transendothelial migration.\",\n      \"method\": \"siRNA knockdown of Vav1, dominant-negative Vav1/Rac, Rac activation assay, flow chamber adhesion assays, transendothelial migration assay\",\n      \"journal\": \"Molecular Biology of the Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA + dominant-negative + functional adhesion assays, single lab\",\n      \"pmids\": [\"15872091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Itk is constitutively associated with Vav1; kinase-inactive Itk rescues TCR-induced Vav localization and actin polarization defects caused by Itk siRNA knockdown, demonstrating a kinase-independent scaffolding function of Itk for Vav recruitment to the site of antigen contact. Loss of Itk disrupts Vav-SLP-76 interactions.\",\n      \"method\": \"siRNA knockdown, kinase-dead/PH/SH2-mutant Itk re-expression, Vav localization imaging, co-immunoprecipitation, membrane-targeted Vav-CAAX rescue\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase-dead rescue + siRNA + Co-IP + localization imaging, single lab\",\n      \"pmids\": [\"15661896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Vav1 deficiency impairs TCR/CD28-induced Akt phosphorylation and FOXO1 phosphorylation, reducing FOXO1 cytoplasmic localization and its association with 14-3-3τ, resulting in failure to downregulate p27kip1 and causing G0-G1 cell cycle arrest. This places Vav1 in a PI3K/Akt/FOXO1/p27kip1 pathway controlling T cell cycle progression.\",\n      \"method\": \"Vav1-/- T cells, Akt/FOXO1 phosphorylation assays, 14-3-3τ Co-IP, cell cycle analysis by FACS, p27kip1 expression\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout, multiple pathway components assayed, single lab\",\n      \"pmids\": [\"17015685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Vav1 is required for DAP10-mediated NK cell cytotoxicity but is not required for ITAM (DAP12/FcRγ)-mediated cytotoxicity; Vav1 interacts with DAP10 YxNM motifs through the adaptor Grb2, and is required for PI3K-dependent Akt signaling and cytoskeletal polarization (actin and microtubule) at the cytolytic synapse.\",\n      \"method\": \"Vav1-/- and Vav1/DAP12-double-deficient mice, cytotoxicity assays, cytoskeletal polarization imaging, Co-IP of Vav1-Grb2-DAP10, Akt activation assay\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — combinatorial genetic knockouts, Co-IP of complex, multiple orthogonal functional assays, replicated by independent lab (PMID 16582911)\",\n      \"pmids\": [\"16887996\", \"16582911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NKG2D-DAP10-mediated cytotoxicity in human NK cells requires a DAP10-bound Grb2-Vav1 intermediate; Grb2-Vav1 binding to DAP10 is sufficient to initiate tyrosine phosphorylation events. Full calcium release and cytotoxicity requires both Grb2-Vav1 and PI3K p85 to bind DAP10.\",\n      \"method\": \"Co-immunoprecipitation of DAP10-Grb2-Vav1 complex, cytotoxicity assays, calcium flux assays with DAP10 mutants\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding complex identification + functional mutant analysis + multiple functional readouts\",\n      \"pmids\": [\"16582911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Vav1 and Vav3 are specifically required for integrin (complement receptor αMβ2)-mediated phagocytosis in macrophages, controlling Arp2/3 recruitment and actin polymerization at the complement-induced phagosome. Constitutively active Rac rescues actin polymerization and phagocytosis in Vav-deficient macrophages, placing Vav upstream of Rac in this pathway. Vav1/3 is not required for FcγR-mediated phagocytosis.\",\n      \"method\": \"Vav1-/-, Vav3-/-, Rac1/2-/- primary murine macrophages, phagocytosis assays, Arp2/3 and actin imaging, constitutively active Rac rescue\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple combinatorial knockouts, constitutively active GTPase rescue, mechanistic epistasis\",\n      \"pmids\": [\"16546099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Vav1 acidic-region tyrosine Tyr174 is required for the maintenance of TCR-signaling microclusters and normal T cell development and activation. The acidic-region tyrosines (Tyr142, Tyr160, Tyr174) conform to SH2-binding motifs and directly bind SH2 domains of Lck, PI3K p85α, and PLCγ1. These tyrosines also regulate Vav1 tyrosine phosphorylation levels. Constitutively activated Vav1 GEF disrupts TCR-signaling microclusters.\",\n      \"method\": \"Knock-in mice (Vav1 Y174F), microcluster imaging by TIRF/confocal microscopy, SH2 domain binding assays, T cell development assays, Vav1 phosphorylation analysis\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knock-in mouse + direct SH2-binding assays + microcluster imaging + multiple functional readouts, single comprehensive study\",\n      \"pmids\": [\"17050525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structure of Vav1 DH-PH-CRD in complex with Rac1 at 2.6 Å resolution reveals a unique intramolecular network of contacts between the Vav1 cysteine-rich domain (CRD) and the C-terminal helix of the DH domain that stabilizes the DH domain for intimate association with the Switch II region of Rac1, displacing the guanine nucleotide. Mutational analysis confirms the CRD is critical for optimal GEF activity and GTPase specificity breadth.\",\n      \"method\": \"X-ray crystallography (2.6 Å), SAXS, site-directed mutagenesis + GEF activity assay\",\n      \"journal\": \"Journal of Molecular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure + SAXS solution validation + mutagenesis functional confirmation, single comprehensive study\",\n      \"pmids\": [\"18589439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Vav1 and Vav3 (but not Vav2) are required for BCR endocytosis and BCR-induced Rac-GTP loading, but not for BCR signaling to MHC-II/CD80 expression or for B cell development/maturation.\",\n      \"method\": \"Vav1-/-, Vav3-/- B cells, BCR endocytosis assay, Rac activation assay, antigen presentation assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockouts, multiple biochemical readouts, single lab\",\n      \"pmids\": [\"19586920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"BCR endocytosis is supported by a sequential pathway: tyrosine phosphorylation of adaptor LAB recruits a Grb2-dynamin complex and Vav; Vav activates Rac1 and Rac2, all of which are required for BCR endocytosis and antigen presentation.\",\n      \"method\": \"LAB phosphorylation assays, co-immunoprecipitation of LAB-Grb2-Vav complex, Rac activation, BCR endocytosis assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — sequential pathway established by Co-IP and functional assays, single lab\",\n      \"pmids\": [\"19858206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Vav1 is required for Dectin-1-mediated phagocytosis of β-glucan and subsequent superoxide production in microglia; Vav1 functions upstream of PI3K and is required for PI3K activation in this pathway.\",\n      \"method\": \"Vav1 siRNA knockdown, PI3K activation assay, phagocytosis assay, superoxide production assay, ordering by inhibitor analysis\",\n      \"journal\": \"Molecular Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown + pathway ordering + two functional readouts, single lab\",\n      \"pmids\": [\"19232731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Vav1 enters SLP-76 microclusters via its C-terminal SH2 and SH3(B) domains, which bind directly to phosphotyrosines 112 and 128 of SLP-76. Both the C-terminal (SH) and N-terminal (GEF) regions of Vav1 contribute to stabilization of SLP-76 microclusters in a GEF-activity-independent manner. The CH domain and catalytic core of the GEF differentially affect Ca2+ responses.\",\n      \"method\": \"Live TIRF imaging of microclusters, biophysical Vav1-SLP76 binding measurements, deletion and point mutants, Ca2+ flux assays\",\n      \"journal\": \"Science Signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct biophysical binding measurements + live imaging + functional mutagenesis, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"21386095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Vav1 is recruited to immunological synapse microclusters in primary T cells; this recruitment depends on the SH2 and C-terminal SH3 (SH3B) domains of Vav1 and on phosphotyrosines 112 and 128 of SLP-76. These same domains are critical for Vav1 tyrosine phosphorylation and TCR-induced Ca2+ flux.\",\n      \"method\": \"Live imaging of primary CD4+ and CD8+ T cells, biophysical direct binding assay (Vav1 to SLP76 phosphopeptides), domain deletion/point mutants, Ca2+ flux assays\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct biophysical binding + live primary cell imaging + domain mutagenesis + functional readout, multiple orthogonal methods\",\n      \"pmids\": [\"22956543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Vav1 is a central regulator of invadopodia assembly in pancreatic tumor cells; its GEF activity toward Cdc42 is required for invadopodia formation. Src-mediated phosphorylation (at Tyr174) activates Vav1 and is sufficient for invadopodia formation; the phosphomimetic Vav1-Y174F drives invadopodia even without Src activation.\",\n      \"method\": \"siRNA knockdown of Vav1, GEF-inactive and Y174F mutants, invadopodia assay (gelatin degradation), Cdc42 activation, Src inhibitor treatment\",\n      \"journal\": \"Current Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA + phosphomimetic mutant + GEF-dead control + multiple functional readouts, single lab\",\n      \"pmids\": [\"24332539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BTK and Vav1 are recruited to Dectin-1-associated phagocytic cups containing Candida albicans; they colocalize with PI(3,4,5)P3 and F-actin. BTK and Vav1-deficient macrophages show defective phagocytosis of C. albicans, and Vav1-/- mice are more susceptible to systemic C. albicans infection.\",\n      \"method\": \"Co-immunoprecipitation with Dectin-1, confocal localization in phagocytic cups, Vav1-/- macrophages and mice, phagocytosis assay, infection susceptibility\",\n      \"journal\": \"PLoS Pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout + imaging + in vivo infection, single lab\",\n      \"pmids\": [\"23825946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Themis1 promotes Vav1 activity in developing thymocytes both in vitro and in vivo by maintaining Grb2 stability; loss of Themis1 reduces Grb2 levels leading to reduced Vav1 activity and impaired T cell development. Proteomic analysis identifies SHP-1, Grb2, and Vav1 as principal Themis1 interacting partners in thymocytes.\",\n      \"method\": \"Quantitative proteomics of Themis1 interactome, TCR reporter mice, Vav1 activity assays in Themis1-/- and overexpressing thymocytes, Grb2 degradation assay\",\n      \"journal\": \"Science Signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics + genetic mouse model + in vitro/in vivo Vav1 activity, single lab, multiple methods\",\n      \"pmids\": [\"27188442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Loss of Vav1 in mesenchymal stem cells (MSCs) reduces Sirt1 levels via Creb, leading to increased acetylation of PPARγ (promoting adipogenesis) and Sox9 (repressing chondrogenesis). Thus Vav1 controls MSC fate decisions between adipocyte and chondrocyte differentiation through a Vav1-Creb-Sirt1 axis.\",\n      \"method\": \"Vav1-/- mice, ectopic Vav1 expression rescue, Sirt1/PPARγ/Sox9 acetylation and expression assays, Creb phosphorylation, adipogenesis and chondrogenesis assays\",\n      \"journal\": \"Stem Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout + rescue + pathway epistasis with multiple biochemical assays, single lab\",\n      \"pmids\": [\"26990002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The G17V RHOA mutant (found in AITL) specifically binds VAV1 and augments its adaptor function through increased phosphorylation of Tyr174, accelerating TCR signaling. VAV1 mutations and a VAV1-STAP2 translocation fusion found in PTCL also augment Tyr174 phosphorylation and TCR signaling.\",\n      \"method\": \"High-throughput protein binding screen, Co-immunoprecipitation, phospho-VAV1 (Tyr174) Western blot, TCR signaling assays, clinical specimen staining\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — binding screen + Co-IP + phosphorylation assay + functional TCR signaling, single lab\",\n      \"pmids\": [\"28832024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In peripheral T cell lymphomas, a recurrent in-frame VAV1 deletion (Δ778-786) and VAV1 gene fusions (VAV1-THAP4, VAV1-MYO1F, VAV1-S100A7) result in increased activation of both catalytic-dependent (MAPK, JNK) and non-catalytic-dependent (NFAT) VAV1 effector pathways, supporting a driver oncogenic role.\",\n      \"method\": \"RNA sequencing, targeted sequencing, MAPK/JNK/NFAT reporter assays in cells expressing the VAV1 variants\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — sequencing-identified variants functionally validated with pathway assays, single lab\",\n      \"pmids\": [\"28062691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The CRD domain of Vav1/Vav2 plays an active role in both the initial binding event (kon) with Rac1 and the rate-limiting dissociation step (kcat) during guanine nucleotide exchange; Vav2-mediated exchange follows a Theorell-Chance mechanism. NMR chemical shift mapping shows the isolated Vav1 CRD directly associates with Rac1 near the P-loop and guanine base.\",\n      \"method\": \"In vitro GEF kinetic assays, fluorescence anisotropy, NMR chemical shift mapping, site-directed mutagenesis of Rac1 and CRD\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with kinetic analysis, NMR structural mapping, mutagenesis of both proteins\",\n      \"pmids\": [\"15850391\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VAV1 is a hematopoietic-specific, tyrosine phosphorylation-regulated guanine nucleotide exchange factor (GEF) for Rho/Rac/Cdc42 GTPases whose catalytic DH domain is allosterically stabilized by its CRD and regulated by phosphorylation of acidic-region Tyr174; upon TCR, BCR, or other immune-receptor stimulation, it is phosphorylated by Lck, Fyn, ZAP-70, and other PTKs, whereupon it is recruited to SLP-76 microclusters at the immunological synapse via its SH2 and C-terminal SH3 domains binding SLP-76 pTyr112/128, and activates downstream cascades including Ca2+/NFAT (via PLCγ activation and LAT phosphorylation), ERK (via RasGRP1 and Sos/LAT), NF-κB (via IKKα and Rac-PKCθ), and actin cytoskeletal reorganization (via Rac1/Cdc42/RhoA) required for integrin activation, phagocytosis, and granule polarization in cytotoxic lymphocytes; it also functions in a GEF-independent scaffolding capacity, translocates to the nucleus to participate in NFAT/NF-κB transcription complexes, and is negatively regulated by Cbl-mediated ubiquitinylation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"VAV1 is a hematopoietic guanine nucleotide exchange factor that couples immune-receptor engagement to Rho-family GTPase activation, cytoskeletal remodeling, and transcriptional programs, and is essential for lymphocyte development and antigen-receptor responses [#5, #23]. It is a substrate of receptor- and TCR-associated tyrosine kinases—including Lck, Fyn, and JAK2—and its activity rises in parallel with its tyrosine phosphorylation upon receptor triggering [#1, #15, #8]. Phosphorylation of the acidic-region tyrosine Tyr174, together with neighboring tyrosines that conform to SH2-binding motifs and engage Lck, PI3K p85, and PLCγ, relieves autoinhibition and sustains TCR-signaling microclusters [#34]. Catalytically, the cysteine-rich domain (CRD) forms an intramolecular network with the DH domain C-terminal helix that stabilizes the catalytic core against the Rac1 Switch II region to displace nucleotide and governs both binding and the rate-limiting exchange step [#35, #47]. Once activated, VAV1 generates GTP-loaded Rac, Rho, and Cdc42 to drive actin polymerization, integrin clustering and inside-out LFA-1 activation, MTOC/granule polarization in cytotoxic lymphocytes, and phagocytosis [#5, #19, #22, #33, #11]. VAV1 is recruited to SLP-76 microclusters at the immunological synapse through its C-terminal SH2 and SH3(B) domains binding SLP-76 phosphotyrosines 112 and 128, both as a catalytic GEF and as a GEF-independent scaffold [#39, #40, #6]. Downstream, it controls Ca2+/NFAT signaling via PLCγ and LAT phosphorylation [#17, #24], ERK activation by recruiting RasGRP1 and Sos1/2 [#24], NF-κB through IKKα and a Rac–PKCθ pathway [#25, #14], and a PI3K/Akt/FOXO1 axis governing cell-cycle progression [#30]. VAV1 additionally translocates to the nucleus, where it is an integral component of NFAT- and NF-κB-like transcription complexes [#20], and it is negatively regulated by Cbl-mediated ubiquitinylation that degrades the phosphorylated protein [#21]. Aberrant VAV1—ectopic expression in pancreatic carcinoma and recurrent mutations, deletions, and fusions in peripheral T cell lymphomas—acts as an oncogenic driver by augmenting catalytic and scaffolding effector pathways [#27, #45, #46].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established VAV1 as an SH2-containing tyrosine-kinase substrate linking receptor activation to signaling and identified its oncogenic potential, framing the central question of how phosphorylation controls its activity.\",\n      \"evidence\": \"Co-IP with activated EGF/PDGF receptors and TCR/CD4 co-activation phosphorylation, plus oncogenic activation by HLH-motif deletion in NIH3T3 and T cells\",\n      \"pmids\": [\"1311423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the catalytic enzymatic activity\", \"Mechanism of phosphorylation-dependent activation unresolved\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Showed VAV1 immunoprecipitates carry nucleotide-releasing activity for Ras-related GTPases that rises with TCR-triggered phosphorylation, first connecting receptor signaling to GEF function.\",\n      \"evidence\": \"GRF activity assays on Vav immunoprecipitates with PTK-inhibitor controls and in vitro Lck kinase assay\",\n      \"pmids\": [\"8484124\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific GTPase substrates not defined\", \"Activity from immunoprecipitates, not purified protein\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Defined VAV1 as a direct upstream GEF for Rho-family GTPases driving actin polymerization and JNK signaling, establishing the cytoskeletal effector arm.\",\n      \"evidence\": \"Microinjection into Swiss 3T3 fibroblasts with actin staining, Rho/Rac/Cdc42 activation and SAPK/JNK1 assays\",\n      \"pmids\": [\"8994827\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve domain basis of catalytic activation\", \"Tested in fibroblasts rather than native hematopoietic cells\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Identified the SH2-dependent VAV1–SLP-76 interaction required for VAV1 phosphorylation and synergistic NF-AT/IL-2 activation, anchoring VAV1 in the TCR signalosome.\",\n      \"evidence\": \"Co-IP, SH2 mutants, and NF-AT/IL-2 reporter assays in Jurkat cells\",\n      \"pmids\": [\"8673706\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map the SLP-76 phosphosites engaged\", \"Scaffolding versus catalytic contributions not separated\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Genetic ablation established VAV1 as essential for antigen-receptor-induced proliferation, thymocyte positive selection, and lymphocyte development.\",\n      \"evidence\": \"RAG-complementation knockout ES cells, proliferation assays, and flow-cytometric thymic analysis\",\n      \"pmids\": [\"7700358\", \"7700360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not distinguish which downstream pathway accounts for the developmental defect\", \"Compensation by paralogs not assessed\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined the VAV1-dependent TCR effector branch—Ca2+ flux, actin/TCR clustering, NFATc1, IL-2, and cell-cycle entry—and its association with cytoskeletal anchors, separating it from MAPK/JNK in T cells.\",\n      \"evidence\": \"Vav1-/- mice with Ca2+, actin, cell-cycle assays and Co-IP of talin/vinculin/SLP-76\",\n      \"pmids\": [\"9601639\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish whether Ca2+ defect is catalytic or scaffolding\", \"MAPK independence in T cells later revised by combinatorial knockouts\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Extended VAV1–Rac signaling to NK-cell killing, linking GEF activity to granule polarization and conjugate formation.\",\n      \"evidence\": \"NK cytotoxicity assays with WT and exchange-dead Vav and dominant-negative Rac1\",\n      \"pmids\": [\"9687532\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; overexpression-based\", \"Receptor coupling to Vav not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Reconstitution showed VAV1 acts directly upstream of PLCγ for FcεRI-driven calcium mobilization in mast cells, generalizing its role across immunoreceptors.\",\n      \"evidence\": \"Vav1-/- mast cell reconstitution with PLCγ phosphorylation and Ca2+ assays\",\n      \"pmids\": [\"11340169\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Vav1 promotes PLCγ phosphorylation not resolved here\", \"Catalytic requirement not tested with GEF-dead mutant\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated a nuclear, transcription-complex role for VAV1 dependent on its C-terminal SH3 domain, establishing a function beyond cytoplasmic GEF signaling.\",\n      \"evidence\": \"Subcellular fractionation, imaging, and chromatin Co-IP with NFAT/NF-κB complexes using domain mutants\",\n      \"pmids\": [\"11994417\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DNA or transcription-factor contacts not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Resolved that VAV1 controls integrin clustering and inside-out LFA-1 activation and MTOC polarization, distinct from synapse protein organization, defining its adhesion role.\",\n      \"evidence\": \"Vav1-/- thymocytes with adhesion, LFA-1 activation, conjugate and MTOC polarization assays, WASP comparison\",\n      \"pmids\": [\"11911819\", \"12616499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GTPase mediating integrin activation not fully defined here\", \"Inside-out signaling intermediates unmapped\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Combinatorial Vav1/2/3 knockouts proved the family is essential for lymphocyte development and antigen-receptor Ca2+ signaling and revealed lineage-specific MAPK dependence and paralog redundancy.\",\n      \"evidence\": \"Triple knockout mice with flow cytometry, Ca2+ flux, and MAPK assays\",\n      \"pmids\": [\"14623913\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not isolate unique non-redundant Vav1 functions in all settings\", \"Molecular basis of B- versus T-cell MAPK difference unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Mapped the VAV1-to-ERK route via LAT phosphorylation controlling RasGRP1 (through PLCγ) and Sos1/2 recruitment, and the VAV1–IKKα/PKCθ route to NF-κB, defining parallel transcriptional effector arms.\",\n      \"evidence\": \"Vav1-/- thymocytes with ERK/Ras and membrane-recruitment assays; Co-IP and kinase assays of Vav1–IKKα; PKCθ translocation/kinase assays\",\n      \"pmids\": [\"14764585\", \"12626540\", \"10714681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LAT phosphorylation control is direct or cytoskeleton-dependent unresolved\", \"Quantitative contribution of each arm to outcomes not weighted\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified Cbl-mediated ubiquitinylation as the negative regulatory mechanism degrading phosphorylated VAV1, closing the activation loop.\",\n      \"evidence\": \"Cbl-/- T cells and 293T ubiquitin assays with RING-finger mutant controls\",\n      \"pmids\": [\"12881521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degradation route (proteasomal/lysosomal) and kinetics not detailed\", \"Single lab\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Kinetic and NMR analyses established that the CRD actively participates in both Rac1 binding and the rate-limiting exchange step, mechanistically defining the catalytic cycle.\",\n      \"evidence\": \"In vitro GEF kinetics, fluorescence anisotropy, NMR chemical shift mapping, and mutagenesis\",\n      \"pmids\": [\"15850391\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not provide a full-length autoinhibited structure\", \"Phosphorylation-coupled conformational change not directly observed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Connected VAV1 to chemokine and growth-factor receptor inputs—CXCL12-driven integrin adhesion/migration, EPO/PI3K proliferation—and to PI3K/Akt/FOXO1 control of cell-cycle progression, broadening its receptor coupling.\",\n      \"evidence\": \"siRNA/dominant-negative Vav1 with Rac and adhesion/migration assays; p85 Co-IP and JAK2 kinase assay; Akt/FOXO1/14-3-3 and cell-cycle assays in Vav1-/- T cells\",\n      \"pmids\": [\"15872091\", \"9162069\", \"17015685\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect coupling to PI3K/Akt not fully resolved\", \"Several findings single-lab\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined receptor-selective VAV1 requirements in innate effectors: DAP10/NKG2D cytotoxicity via a Grb2-VAV1 intermediate, and integrin-receptor (but not FcγR) phagocytosis via Rac-driven Arp2/3 actin assembly.\",\n      \"evidence\": \"Combinatorial knockout NK cells and macrophages, Co-IP of DAP10-Grb2-Vav1, cytotoxicity/phagocytosis assays, constitutively active Rac rescue\",\n      \"pmids\": [\"16887996\", \"16582911\", \"16546099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis of ITAM versus DAP10 selectivity not fully defined\", \"Quantitative GTPase requirements across receptors unmapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"The DH-PH-CRD–Rac1 crystal structure revealed the CRD–DH intramolecular network that stabilizes the catalytic core for Switch-II engagement and nucleotide displacement, providing the structural basis of catalysis and substrate breadth.\",\n      \"evidence\": \"X-ray crystallography at 2.6 Å, SAXS, and mutagenesis with GEF assays\",\n      \"pmids\": [\"18589439\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not capture the phosphoregulatory acidic region in context\", \"Full autoinhibited conformation not solved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Knock-in analysis established acidic-region Tyr174 (and Tyr142/Tyr160) as direct SH2-binding sites for Lck, PI3K p85, and PLCγ that sustain TCR microclusters and tune VAV1 phosphorylation, defining the phosphoregulatory switch.\",\n      \"evidence\": \"Vav1 Y174F knock-in mice, microcluster imaging, SH2-binding assays, development and phosphorylation analyses\",\n      \"pmids\": [\"17050525\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order of de-repression versus partner recruitment not resolved\", \"Quantitative coupling of each tyrosine to effector arms unmeasured\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Live-imaging and biophysical studies pinpointed that VAV1 enters SLP-76 microclusters via SH2/SH3(B) binding to SLP-76 pTyr112/128 and contributes both catalytically and as a GEF-independent scaffold, unifying its synapse recruitment mechanism.\",\n      \"evidence\": \"TIRF imaging in primary T cells, direct phosphopeptide binding measurements, domain mutants, and Ca2+ flux assays\",\n      \"pmids\": [\"21386095\", \"22956543\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative weighting of scaffolding versus GEF outputs context-dependent and unresolved\", \"Stoichiometry within microclusters not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified upstream regulators (Themis1 via Grb2 stability) and non-hematopoietic roles (a Vav1-Creb-Sirt1 axis governing MSC fate), broadening the regulatory network.\",\n      \"evidence\": \"Themis1 interactome proteomics with knockout/overexpression Vav1 activity assays; Vav1-/- MSC differentiation with Sirt1/PPARγ/Sox9 acetylation assays\",\n      \"pmids\": [\"27188442\", \"26990002\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MSC axis single lab and mechanistically indirect\", \"Generality of non-hematopoietic VAV1 function unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established VAV1 as an oncogenic driver: ectopic expression in pancreatic carcinoma and recurrent T-cell-lymphoma mutations, deletions, and fusions augment Tyr174 phosphorylation and both catalytic and scaffolding effector pathways.\",\n      \"evidence\": \"RNAi/GEF-dead/in vivo tumor assays in pancreatic cells; binding screens, Co-IP, phospho-Tyr174 blots, and MAPK/JNK/NFAT reporter assays for lymphoma variants and RHOA G17V\",\n      \"pmids\": [\"15652748\", \"28832024\", \"28062691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether all variants act through a common conformational mechanism unresolved\", \"No direct VAV1-targeted therapeutic validation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How phosphorylation of the acidic region is structurally coupled to relief of CRD-stabilized autoinhibition in full-length VAV1, and how catalytic versus scaffolding outputs are quantitatively partitioned across different receptors, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No full-length autoinhibited structure with the acidic region\", \"Effector-arm partitioning not quantified per receptor context\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 5, 35, 47]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 35, 47]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6, 39, 40, 25]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [14, 13]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [14, 25, 39, 40]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 4, 23, 17, 24, 33]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 5, 24, 25, 28]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 20, 24, 25]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [27, 45, 46]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"complexes\": [\n      \"SLP-76 microcluster\",\n      \"DAP10-Grb2-Vav1 complex\",\n      \"LAB-Grb2-Vav-dynamin complex\"\n    ],\n    \"partners\": [\n      \"SLP76\",\n      \"GRB2\",\n      \"PIK3R1\",\n      \"LCK\",\n      \"FYN\",\n      \"CBL\",\n      \"DAP10\",\n      \"ITK\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}