{"gene":"RASA1","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1996,"finding":"Crystal structure of the GTPase-activating domain of human p120GAP (GAP-334) was solved, revealing it as an elongated, exclusively helical protein with a novel fold consisting of two domains. Conserved residues around a shallow groove in the central domain identify the Ras·GTP interaction site, providing a structural model for how GAP accelerates GTP hydrolysis by Ras.","method":"X-ray crystallography","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional mapping of conserved residues and interaction site, validated against extensive biochemical and genetic data","pmids":["8955277"],"is_preprint":false},{"year":1990,"finding":"RASA1 (p120GAP) is phosphorylated on tyrosine in cells transformed by cytoplasmic and receptor-like tyrosine kinases (v-src, v-fps) and in fibroblasts stimulated with EGF. Two co-precipitating proteins, p62 and p190, are also tyrosine-phosphorylated under the same conditions, indicating that tyrosine kinases interact with the RASA1 complex through its SH2 domains.","method":"Tyrosine phosphorylation assay, co-immunoprecipitation, inducible oncogene expression system","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus multiple kinase systems and growth factor stimulation, independently replicated context","pmids":["1689011"],"is_preprint":false},{"year":1992,"finding":"Erythropoietin stimulation of HEL cells induces rapid tyrosine phosphorylation of p120GAP (RASA1), correlating with activation of p21ras (increased GTP loading) and reduced GTPase-promoting activity of cell lysates in vitro, suggesting that tyrosine phosphorylation of RASA1 inhibits its GAP activity and thereby allows Ras activation downstream of the erythropoietin receptor.","method":"In vitro GTP hydrolysis assay, tyrosine phosphorylation analysis, anti-RASA1 immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro GAP activity assay combined with phosphorylation analysis, single lab, two orthogonal methods","pmids":["1569084"],"is_preprint":false},{"year":1994,"finding":"p210bcr/abl tyrosine kinase expression in fibroblasts simultaneously activates p21ras and inhibits the GTPase-promoting activity of p120GAP (RASA1). Conversely, downregulation of p210bcr/abl in CML cells with antisense oligonucleotides restores RASA1 GTPase-promoting activity and inhibits Ras activation. Tyrosine phosphorylation of p190 and p62 (RASA1-associated proteins) depends on bcr/abl kinase activity.","method":"GTPase activity assay, antisense oligonucleotide knockdown, transient expression","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional GAP activity assay plus genetic knockdown, single lab","pmids":["8195713"],"is_preprint":false},{"year":1996,"finding":"The CaLB (Ca2+-dependent lipid binding) domain of p120GAP (RASA1) mediates a direct protein-protein interaction with annexin VI (p70). This interaction was demonstrated in vitro using the isolated CaLB domain and confirmed by co-immunoprecipitation in rat fibroblasts, suggesting the CaLB domain directs calcium-dependent membrane association of RASA1 through binding to annexin VI.","method":"In vitro binding assay with isolated CaLB domain, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding confirmed by reciprocal co-IP in cells, single lab","pmids":["8798684"],"is_preprint":false},{"year":1998,"finding":"In mouse fibroblasts undergoing integrin-mediated cell-substrate interaction, p120RasGAP (RASA1) and its associated protein p190RhoGAP are rapidly recruited to the cytoskeleton together with focal adhesion kinase (p125FAK). This recruitment occurs upon plating on ECM proteins such as fibronectin, indicating integrin-mediated relocalization of RASA1 to cytoskeletal signaling complexes.","method":"Subcellular fractionation, Western blot, integrin-mediated adhesion assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — fractionation-based localization study, single lab, replicated with multiple ECM proteins","pmids":["9690509"],"is_preprint":false},{"year":1998,"finding":"Sam68 associates with p120GAP (RASA1) and PLCγ1 in mature human CD4+ T cells. This association is dependent on CD4 expression and partially dependent on the association of CD4 with p56lck, as demonstrated by reduced Sam68-RASA1 co-precipitation in CD4-negative mutants and in cells expressing a CD4 mutant unable to interact with p56lck.","method":"Co-immunoprecipitation in CD4+/CD4- T cell lines and CD4 mutants","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP with genetic validation using CD4 and p56lck mutants, single lab","pmids":["9743338"],"is_preprint":false},{"year":2001,"finding":"RACK1 (a PKC scaffolding protein) interacts with p120GAP (RASA1) in a manner dependent on both the PH and C2/CaLB domains of RASA1. A fusion protein containing the GAP PH domain directly bound recombinant RACK1 in vitro, and co-immunoprecipitation confirmed the in vivo association. Serine/threonine phosphorylation regulates this interaction.","method":"Co-immunoprecipitation, in vitro pulldown with domain deletion mutants and recombinant proteins","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro direct binding plus in vivo co-IP with domain mutants, single lab","pmids":["11350068"],"is_preprint":false},{"year":2005,"finding":"Annexin A6 promotes plasma membrane targeting of p120GAP (RASA1) in a Ca2+-dependent manner in living cells and stimulates membrane binding of RASA1 in vitro. Annexin A6 expression reduces HDL- and EGF-induced Ras and Raf-1 activation, and this effect is mediated via RASA1, as RNAi-mediated reduction of RASA1 levels showed enhanced Ras activation particularly in annexin A6-expressing cells.","method":"Live cell imaging, in vitro membrane binding assay, RNAi knockdown, Ras activation assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (in vitro assay, live imaging, RNAi), single lab","pmids":["15940262"],"is_preprint":false},{"year":2006,"finding":"Integrin signaling through the Arg tyrosine kinase activates p190RhoGAP by promoting its binding to p120RasGAP (RASA1) and recruitment to the cell periphery. p190 requires its p120-binding domain for Arg-dependent activation in vivo; however, p120 binding does not directly activate p190RhoGAP activity in vitro. A dominant-negative p120 fragment blocks p190:p120 complex formation, prevents p190 activation, and disrupts adhesion-dependent recruitment of p190 to the cell periphery.","method":"In vitro RhoGAP activity assay, dominant-negative p120 fragment, co-immunoprecipitation, immunofluorescence localization","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro GAP assay combined with dominant-negative genetics, localization imaging, and multiple cell lines; multiple orthogonal methods in single rigorous study","pmids":["16971514"],"is_preprint":false},{"year":2009,"finding":"FAK promotes cell polarity during migration by forming a complex with p120RasGAP (RASA1) and p190RhoGAP (p190A) at leading-edge focal adhesions. Fibronectin-integrin-mediated FAK activation promotes SH2-mediated binding of RASA1 to FAK, and this FAK-RASA1 association facilitates FAK-mediated p190A tyrosine phosphorylation. Knockdown of RASA1, mutation of FAK Y397, or inhibition of FAK activity all prevented FAK-p190A association, p190A phosphorylation, and cell polarity.","method":"Co-immunoprecipitation, siRNA knockdown, FAK Y397 mutation, wound-healing and Golgi reorientation assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, siRNA knockdown, site-directed mutagenesis, and two independent polarity assays in multiple cell types","pmids":["19435801"],"is_preprint":false},{"year":2009,"finding":"RGMa binding to its receptor neogenin leads to dephosphorylation of FAK at Tyr-397, which dissociates RASA1 (p120GAP) from FAK. This dissociation increases the interaction between RASA1 and GTP-Ras, leading to Ras inactivation. Knockdown of RASA1 prevents RGMa-induced growth cone collapse and neurite outgrowth inhibition in cortical neurons. RGMa also inactivates Akt through RASA1, and constitutively active Akt rescues RGMa-induced growth cone collapse.","method":"siRNA knockdown, co-immunoprecipitation, phosphorylation assays, growth cone collapse assay","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA knockdown with functional rescue, co-IP demonstrating dynamic complex assembly, multiple downstream readouts","pmids":["19458235"],"is_preprint":false},{"year":2010,"finding":"miR-132 suppresses p120RasGAP (RASA1) expression in endothelial cells, leading to increased Ras activity and induction of neovascularization. A miRNA-resistant version of p120RasGAP reversed the vascular response induced by miR-132. Anti-miR-132 inhibited angiogenesis in wild-type mice but not in mice with inducible deletion of Rasa1, placing RASA1 directly downstream of miR-132 as the effector of the angiogenic switch.","method":"miRNA overexpression/antagomir, Rasa1 conditional knockout, rescue with miRNA-resistant RASA1, retinal vascular assay","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with conditional knockout, miRNA-resistant rescue experiment, multiple in vivo and in vitro assays","pmids":["20676106"],"is_preprint":false},{"year":2011,"finding":"p120RasGAP (RASA1) regulates recycling of endocytosed α/β1-integrin heterodimers to the plasma membrane. RASA1 interacts with the cytoplasmic domain of integrin α-subunits via its GAP domain and competes with Rab21 for binding to endocytosed integrins, facilitating exit of integrins from Rab21- and EEA1-positive endosomes. Silencing of RASA1 attenuated integrin recycling and augmented cell motility.","method":"siRNA knockdown, co-immunoprecipitation, integrin recycling assay, competitive binding assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA knockdown with functional readout, co-IP identifying GAP domain as binding region, competitive binding mechanism established with multiple orthogonal methods","pmids":["21768288"],"is_preprint":false},{"year":2014,"finding":"RASA1 functions as a critical effector downstream of the endothelial receptor EPHB4. In zebrafish, RASA1 or EPHB4 deficiency produce similar vascular abnormalities, and engineered EPHB4 receptors with impaired RASA1-binding fail to rescue blood flow in EPHB4-deficient animals. EPHB4 deficiency leads to robust mTORC1 overactivation, and pharmacological mTORC1 inhibition rescues vessel structure and function, defining an EPHB4/RASA1/mTORC1 signaling axis in endothelial cells.","method":"Zebrafish genetic models, engineered receptor rescue, mTORC1 pharmacological inhibition, tissue lysate signaling analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in zebrafish with engineered receptor rescue and pharmacological pathway validation, multiple orthogonal approaches","pmids":["24837431"],"is_preprint":false},{"year":2014,"finding":"The SH3 domain of p120RasGAP (RASA1) selectively inhibits the RhoGAP activity of all three DLC isoforms (DLC1-3) by targeting the catalytic arginine finger of the DLC RhoGAP domain, thereby competitively inhibiting RhoGAP activity. This represents an atypical SH3 interaction not following the classical PXXP motif. This cross-talk functionally connects Ras and Rho regulatory pathways.","method":"Biochemical RhoGAP activity assay, structural/mutational analysis, SH3 domain competition assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical activity assay with structural and mutational validation, multiple DLC isoforms tested","pmids":["24443565"],"is_preprint":false},{"year":2016,"finding":"PTP1B directly dephosphorylates the transcription factor PITX1 at Y160, Y175, and Y179, reducing its protein stability and transcriptional activity toward the RASA1 gene. PTP1B inhibition or silencing upregulates the PITX1-p120RasGAP axis. Sorafenib decreases PTP1B activity, promoting PITX1 hyperphosphorylation and increased RASA1 expression.","method":"In vitro dephosphorylation assay, siRNA knockdown, luciferase reporter assay, molecular docking","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro phosphatase assay with site-specific mutations, functional transcriptional readout, single lab","pmids":["26840794"],"is_preprint":false},{"year":2017,"finding":"RASA1 regulates the function of lymphatic vessel valves; catalytic (RasGAP) activity is essential for this function. Disruption of Rasa1 in adult mice resulted in loss of lymphatic endothelial cells specifically from collecting lymphatic vessel valve leaflets, preventing backflow prevention and impairing vessel pumping. A catalytically inactive RASA1(R780Q) mutant phenocopied Rasa1 deletion, demonstrating that RasGAP catalytic activity is required.","method":"Inducible conditional knockout mice, catalytically inactive knock-in mutant (R780Q), lymphatic vessel functional assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with catalytic-dead knock-in mutant, specific cellular and functional phenotype readout, two complementary mouse models","pmids":["28530642"],"is_preprint":false},{"year":2017,"finding":"RASA1 knockdown in human bronchial epithelial cells activates signaling downstream of RAS and promotes cell growth. Restoration of RASA1 expression in RASA1-mutated NSCLC cells reduces MAPK and PI3K signaling. Concurrent genetic silencing of RASA1 and NF1 profoundly sensitizes cells to MEK inhibition (trametinib), indicating that RASA1 and NF1 cooperatively suppress RAS/MAPK signaling.","method":"shRNA knockdown, ectopic re-expression, MEK inhibitor sensitivity assay, signaling pathway analysis","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional knockdown and rescue with downstream signaling readout, single lab, multiple cell line models","pmids":["29127119"],"is_preprint":false},{"year":2019,"finding":"RASA1 is required in endothelial cells for the export of collagen IV and its deposition in vascular basement membranes during developmental angiogenesis. In the absence of RASA1, dysregulated Ras-MAPK signaling causes impaired folding of collagen IV and its retention in the ER, leading to endothelial cell death. Chemical chaperone 4-PBA and MAPK inhibitors rescued ER retention of collagen IV and EC apoptosis, restoring normal angiogenesis.","method":"Multiple conditional knockout mouse models, pharmacological rescue (4-PBA, MAPK inhibitors, collagen-modifying enzyme inhibitors), ER retention assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple murine models, pharmacological rescue with mechanistic specificity, orthogonal approaches establishing ER retention mechanism","pmids":["31185000"],"is_preprint":false}],"current_model":"RASA1 (p120RasGAP) is a multi-domain RasGTPase-activating protein that accelerates GTP hydrolysis on Ras (via an arginine-finger mechanism defined crystallographically) to terminate Ras signaling; it is recruited to the plasma membrane and focal adhesions through SH2-domain interactions with phosphotyrosine proteins (including FAK and receptor/non-receptor tyrosine kinases), where it forms complexes with p190RhoGAP (facilitating Rho inactivation and cell polarity), annexin A6, and integrin α-subunits (regulating integrin recycling); its catalytic activity is essential for lymphatic valve endothelial cell survival and function, for collagen IV export during vascular development, and for suppression of mTORC1 in an EPHB4/RASA1/mTORC1 endothelial signaling axis, with its expression transcriptionally controlled by the PITX1/PTP1B axis and post-transcriptionally suppressed by miRNAs including miR-132, miR-223, and miR-21."},"narrative":{"mechanistic_narrative":"RASA1 (p120RasGAP) is a multi-domain GTPase-activating protein that terminates Ras signaling by accelerating GTP hydrolysis on Ras, with its catalytic GAP domain forming a shallow groove that engages Ras·GTP [PMID:8955277]. Its activity is regulated by tyrosine phosphorylation: oncogenic and receptor tyrosine kinases (v-src, v-fps, EGFR, bcr/abl) and cytokine receptors (erythropoietin) phosphorylate RASA1 and inhibit its GAP activity, permitting Ras activation, while its SH2 domains recruit it into phosphotyrosine-dependent complexes [PMID:1689011, PMID:1569084, PMID:8195713]. RASA1 is dynamically targeted to membranes and adhesion sites: annexin A6 directs Ca2+-dependent plasma membrane localization that restrains Ras/Raf activation [PMID:15940262], and integrin- and FAK-mediated cues recruit RASA1 with p190RhoGAP to focal adhesions, where SH2-mediated binding to FAK (at Tyr397) drives p190RhoGAP activation and establishes cell polarity during migration [PMID:9690509, PMID:16971514, PMID:19435801]. This coupling extends to neuronal guidance, where RGMa-neogenin signaling dephosphorylates FAK Y397 to release RASA1 onto Ras and mediate growth cone collapse [PMID:19458235]. RASA1 also bridges Ras and Rho regulation through its SH3 domain, which inhibits the RhoGAP activity of DLC1-3 by targeting their catalytic arginine finger [PMID:24443565], and regulates integrin recycling by competing with Rab21 for endocytosed integrin α-subunits via its GAP domain [PMID:21768288]. In the vasculature, RASA1 acts as a critical effector of EPHB4 to suppress mTORC1 [PMID:24837431], is required for lymphatic valve endothelial cell survival in a catalytic-activity-dependent manner [PMID:28530642], and enables collagen IV export from the ER during angiogenesis by restraining Ras-MAPK signaling [PMID:31185000]. As a RAS/MAPK suppressor, RASA1 cooperates with NF1 to limit RAS signaling, and its expression is controlled by the PITX1/PTP1B axis transcriptionally and by miR-132 post-transcriptionally [PMID:26840794, PMID:29127119, PMID:20676106].","teleology":[{"year":1990,"claim":"Established that RASA1 is a substrate and binding partner of tyrosine kinases, defining how its SH2-containing complex links growth factor and oncogene signaling to Ras.","evidence":"Tyrosine phosphorylation assay and co-IP in v-src/v-fps-transformed and EGF-stimulated cells, identifying co-precipitating p62 and p190","pmids":["1689011"],"confidence":"High","gaps":["Functional consequence of phosphorylation on GAP activity not directly measured here","Identity of p62/p190 not molecularly resolved"]},{"year":1992,"claim":"Showed that tyrosine phosphorylation of RASA1 functionally inhibits its GAP activity, providing a mechanism for receptor-driven Ras activation.","evidence":"In vitro GTP hydrolysis assay with phosphorylation analysis after erythropoietin stimulation of HEL cells","pmids":["1569084"],"confidence":"Medium","gaps":["Correlative link between phosphorylation and GAP inhibition, not causal residue mapping","Single cell-lysate-based activity readout"]},{"year":1994,"claim":"Extended the kinase-regulation model to leukemogenic bcr/abl, demonstrating reversible suppression of RASA1 GAP activity tied to Ras activation.","evidence":"GTPase activity assay with antisense knockdown of p210bcr/abl in CML cells","pmids":["8195713"],"confidence":"Medium","gaps":["Mechanism connecting kinase activity to GAP inhibition not defined","Single lab"]},{"year":1996,"claim":"Provided the structural basis for catalysis, revealing the Ras·GTP interaction surface on the GAP domain.","evidence":"X-ray crystallography of GAP-334 with functional mapping of conserved residues","pmids":["8955277"],"confidence":"High","gaps":["No co-crystal with Ras in this structure","Regulatory domains outside GAP not structurally characterized"]},{"year":1996,"claim":"Identified the CaLB/C2 domain as a membrane-targeting module through direct annexin VI binding.","evidence":"In vitro binding with isolated CaLB domain and co-IP in rat fibroblasts","pmids":["8798684"],"confidence":"Medium","gaps":["Functional consequence for Ras signaling not tested here","Single lab"]},{"year":1998,"claim":"Demonstrated integrin-driven relocalization of RASA1 with p190RhoGAP and FAK to cytoskeletal signaling complexes, linking adhesion to Ras/Rho regulation.","evidence":"Subcellular fractionation and Western blot after plating on ECM proteins","pmids":["9690509"],"confidence":"Medium","gaps":["Fractionation-based, no direct imaging of complex","Functional output of recruitment not assessed"]},{"year":1998,"claim":"Placed RASA1 in a CD4/lck-dependent signaling complex with Sam68 and PLCγ1 in T cells.","evidence":"Co-IP across CD4+/CD4- T cell lines and CD4/lck-binding mutants","pmids":["9743338"],"confidence":"Medium","gaps":["Direct binding partner within the complex not resolved","Downstream signaling consequence untested"]},{"year":2001,"claim":"Defined PH and C2/CaLB domains as a docking site for the PKC scaffold RACK1, regulated by Ser/Thr phosphorylation.","evidence":"In vitro pulldown with domain-deletion mutants and recombinant RACK1 plus co-IP","pmids":["11350068"],"confidence":"Medium","gaps":["Functional role of RACK1-RASA1 complex unknown","Single lab"]},{"year":2005,"claim":"Established annexin A6 as a Ca2+-dependent driver of RASA1 membrane targeting that dampens Ras/Raf-1 activation.","evidence":"Live-cell imaging, in vitro membrane binding, RNAi knockdown, and Ras activation assay","pmids":["15940262"],"confidence":"Medium","gaps":["Quantitative contribution of annexin A6 versus other targeting modules unresolved","Single lab"]},{"year":2006,"claim":"Showed that integrin/Arg-kinase signaling activates p190RhoGAP through RASA1 binding and peripheral recruitment, coupling RASA1 to Rho inactivation.","evidence":"In vitro RhoGAP assay, dominant-negative p120 fragment, co-IP, and immunofluorescence","pmids":["16971514"],"confidence":"High","gaps":["p120 binding does not directly activate p190 in vitro; the activating step remains indirect","Precise localization signal not defined"]},{"year":2009,"claim":"Resolved how FAK assembles a RASA1/p190RhoGAP complex at leading-edge adhesions to set cell polarity during migration.","evidence":"Co-IP, siRNA knockdown, FAK Y397 mutation, and wound-healing/Golgi reorientation assays","pmids":["19435801"],"confidence":"High","gaps":["Relative contribution of RasGAP versus scaffolding function in polarity not separated","Ras-GTP changes not directly measured"]},{"year":2009,"claim":"Demonstrated dynamic FAK-RASA1 dissociation as the switch that converts RGMa-neogenin signaling into Ras and Akt inactivation and growth cone collapse.","evidence":"siRNA knockdown with functional rescue, co-IP, phosphorylation assays, growth cone collapse assay in cortical neurons","pmids":["19458235"],"confidence":"High","gaps":["Direct measurement of RASA1-Ras complex stoichiometry absent","In vivo relevance to axon guidance not tested here"]},{"year":2010,"claim":"Placed RASA1 directly downstream of miR-132 as the effector of an angiogenic switch in endothelial cells.","evidence":"miRNA overexpression/antagomir, Rasa1 conditional knockout, miRNA-resistant RASA1 rescue, and retinal vascular assay","pmids":["20676106"],"confidence":"High","gaps":["Other miR-132 targets contributing to angiogenesis not excluded","Mechanism downstream of Ras in this context not detailed"]},{"year":2011,"claim":"Uncovered a non-catalytic role: RASA1 promotes integrin recycling by competing with Rab21 for endocytosed integrin α-subunits via its GAP domain.","evidence":"siRNA knockdown, co-IP, integrin recycling and competitive binding assays","pmids":["21768288"],"confidence":"High","gaps":["Whether GAP catalytic activity is required for the recycling function unresolved","In vivo physiological role not addressed"]},{"year":2014,"claim":"Defined an EPHB4/RASA1/mTORC1 endothelial signaling axis, showing RASA1 as the key EPHB4 effector suppressing mTORC1 for vessel formation.","evidence":"Zebrafish genetic models, engineered RASA1-binding-impaired EPHB4 receptors, and mTORC1 pharmacological rescue","pmids":["24837431"],"confidence":"High","gaps":["Molecular link from RASA1 to mTORC1 suppression not detailed","Reliance on zebrafish for in vivo conclusions"]},{"year":2014,"claim":"Revealed an atypical SH3-mediated cross-talk in which RASA1 inhibits DLC1-3 RhoGAP activity, functionally linking Ras and Rho pathway regulation.","evidence":"Biochemical RhoGAP activity assay with structural/mutational analysis of the catalytic arginine finger","pmids":["24443565"],"confidence":"High","gaps":["Cellular consequences of DLC inhibition by RASA1 not established here","Physiological contexts for this cross-talk unknown"]},{"year":2016,"claim":"Identified transcriptional control of RASA1 through the PTP1B/PITX1 axis, with PTP1B dephosphorylation destabilizing PITX1 and lowering RASA1 expression.","evidence":"In vitro dephosphorylation assay with site-specific PITX1 mutants, luciferase reporter, and siRNA knockdown","pmids":["26840794"],"confidence":"Medium","gaps":["Direct PITX1 occupancy of the RASA1 promoter not shown","Single lab"]},{"year":2017,"claim":"Demonstrated that RasGAP catalytic activity is essential for lymphatic valve endothelial cell survival and valve function.","evidence":"Inducible conditional knockout and catalytically inactive R780Q knock-in mice with lymphatic functional assays","pmids":["28530642"],"confidence":"High","gaps":["Upstream receptor driving this requirement not defined here","Molecular cause of valve cell death not detailed"]},{"year":2017,"claim":"Established RASA1 as a tumor-suppressive RAS regulator cooperating with NF1, with restoration reducing MAPK/PI3K signaling.","evidence":"shRNA knockdown, ectopic re-expression, and MEK inhibitor sensitivity in bronchial epithelial and NSCLC cells","pmids":["29127119"],"confidence":"Medium","gaps":["Mechanism of RASA1-NF1 cooperativity not resolved","Single lab"]},{"year":2019,"claim":"Linked RASA1 loss to ER retention of collagen IV via dysregulated Ras-MAPK, explaining endothelial cell death in vascular development.","evidence":"Multiple conditional knockout mouse models with pharmacological rescue (4-PBA, MAPK inhibitors) and ER retention assays","pmids":["31185000"],"confidence":"High","gaps":["How Ras-MAPK signaling impairs collagen IV folding mechanistically unresolved","Generality beyond collagen IV not tested"]},{"year":null,"claim":"How RASA1's catalytic, scaffolding, and membrane-targeting functions are integrated and selectively deployed across distinct vascular, lymphatic, neuronal, and immune contexts remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model distinguishing GAP-dependent versus GAP-independent roles in vivo","Direct structural basis for RASA1 regulation by phosphorylation absent","Mechanistic link from RASA1 to mTORC1 and to collagen IV folding unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,3,15,17]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,15]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[10,11,14]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[4,8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[9,10]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,8]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[5,9,10]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[13]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,11,14,18]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[12,14,17,19]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,18]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[19]}],"complexes":["FAK-RASA1-p190RhoGAP focal adhesion complex"],"partners":["FAK","ARHGAP35","ANXA6","RACK1","KHDRBS1","EPHB4","DLC1","ITGA1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P20936","full_name":"Ras GTPase-activating protein 1","aliases":["Ras p21 protein 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Conserved residues around a shallow groove in the central domain identify the Ras·GTP interaction site, providing a structural model for how GAP accelerates GTP hydrolysis by Ras.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional mapping of conserved residues and interaction site, validated against extensive biochemical and genetic data\",\n      \"pmids\": [\"8955277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"RASA1 (p120GAP) is phosphorylated on tyrosine in cells transformed by cytoplasmic and receptor-like tyrosine kinases (v-src, v-fps) and in fibroblasts stimulated with EGF. Two co-precipitating proteins, p62 and p190, are also tyrosine-phosphorylated under the same conditions, indicating that tyrosine kinases interact with the RASA1 complex through its SH2 domains.\",\n      \"method\": \"Tyrosine phosphorylation assay, co-immunoprecipitation, inducible oncogene expression system\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus multiple kinase systems and growth factor stimulation, independently replicated context\",\n      \"pmids\": [\"1689011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Erythropoietin stimulation of HEL cells induces rapid tyrosine phosphorylation of p120GAP (RASA1), correlating with activation of p21ras (increased GTP loading) and reduced GTPase-promoting activity of cell lysates in vitro, suggesting that tyrosine phosphorylation of RASA1 inhibits its GAP activity and thereby allows Ras activation downstream of the erythropoietin receptor.\",\n      \"method\": \"In vitro GTP hydrolysis assay, tyrosine phosphorylation analysis, anti-RASA1 immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro GAP activity assay combined with phosphorylation analysis, single lab, two orthogonal methods\",\n      \"pmids\": [\"1569084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"p210bcr/abl tyrosine kinase expression in fibroblasts simultaneously activates p21ras and inhibits the GTPase-promoting activity of p120GAP (RASA1). Conversely, downregulation of p210bcr/abl in CML cells with antisense oligonucleotides restores RASA1 GTPase-promoting activity and inhibits Ras activation. Tyrosine phosphorylation of p190 and p62 (RASA1-associated proteins) depends on bcr/abl kinase activity.\",\n      \"method\": \"GTPase activity assay, antisense oligonucleotide knockdown, transient expression\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional GAP activity assay plus genetic knockdown, single lab\",\n      \"pmids\": [\"8195713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The CaLB (Ca2+-dependent lipid binding) domain of p120GAP (RASA1) mediates a direct protein-protein interaction with annexin VI (p70). This interaction was demonstrated in vitro using the isolated CaLB domain and confirmed by co-immunoprecipitation in rat fibroblasts, suggesting the CaLB domain directs calcium-dependent membrane association of RASA1 through binding to annexin VI.\",\n      \"method\": \"In vitro binding assay with isolated CaLB domain, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding confirmed by reciprocal co-IP in cells, single lab\",\n      \"pmids\": [\"8798684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"In mouse fibroblasts undergoing integrin-mediated cell-substrate interaction, p120RasGAP (RASA1) and its associated protein p190RhoGAP are rapidly recruited to the cytoskeleton together with focal adhesion kinase (p125FAK). This recruitment occurs upon plating on ECM proteins such as fibronectin, indicating integrin-mediated relocalization of RASA1 to cytoskeletal signaling complexes.\",\n      \"method\": \"Subcellular fractionation, Western blot, integrin-mediated adhesion assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — fractionation-based localization study, single lab, replicated with multiple ECM proteins\",\n      \"pmids\": [\"9690509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Sam68 associates with p120GAP (RASA1) and PLCγ1 in mature human CD4+ T cells. This association is dependent on CD4 expression and partially dependent on the association of CD4 with p56lck, as demonstrated by reduced Sam68-RASA1 co-precipitation in CD4-negative mutants and in cells expressing a CD4 mutant unable to interact with p56lck.\",\n      \"method\": \"Co-immunoprecipitation in CD4+/CD4- T cell lines and CD4 mutants\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP with genetic validation using CD4 and p56lck mutants, single lab\",\n      \"pmids\": [\"9743338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"RACK1 (a PKC scaffolding protein) interacts with p120GAP (RASA1) in a manner dependent on both the PH and C2/CaLB domains of RASA1. A fusion protein containing the GAP PH domain directly bound recombinant RACK1 in vitro, and co-immunoprecipitation confirmed the in vivo association. Serine/threonine phosphorylation regulates this interaction.\",\n      \"method\": \"Co-immunoprecipitation, in vitro pulldown with domain deletion mutants and recombinant proteins\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro direct binding plus in vivo co-IP with domain mutants, single lab\",\n      \"pmids\": [\"11350068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Annexin A6 promotes plasma membrane targeting of p120GAP (RASA1) in a Ca2+-dependent manner in living cells and stimulates membrane binding of RASA1 in vitro. Annexin A6 expression reduces HDL- and EGF-induced Ras and Raf-1 activation, and this effect is mediated via RASA1, as RNAi-mediated reduction of RASA1 levels showed enhanced Ras activation particularly in annexin A6-expressing cells.\",\n      \"method\": \"Live cell imaging, in vitro membrane binding assay, RNAi knockdown, Ras activation assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (in vitro assay, live imaging, RNAi), single lab\",\n      \"pmids\": [\"15940262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Integrin signaling through the Arg tyrosine kinase activates p190RhoGAP by promoting its binding to p120RasGAP (RASA1) and recruitment to the cell periphery. p190 requires its p120-binding domain for Arg-dependent activation in vivo; however, p120 binding does not directly activate p190RhoGAP activity in vitro. A dominant-negative p120 fragment blocks p190:p120 complex formation, prevents p190 activation, and disrupts adhesion-dependent recruitment of p190 to the cell periphery.\",\n      \"method\": \"In vitro RhoGAP activity assay, dominant-negative p120 fragment, co-immunoprecipitation, immunofluorescence localization\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro GAP assay combined with dominant-negative genetics, localization imaging, and multiple cell lines; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"16971514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FAK promotes cell polarity during migration by forming a complex with p120RasGAP (RASA1) and p190RhoGAP (p190A) at leading-edge focal adhesions. Fibronectin-integrin-mediated FAK activation promotes SH2-mediated binding of RASA1 to FAK, and this FAK-RASA1 association facilitates FAK-mediated p190A tyrosine phosphorylation. Knockdown of RASA1, mutation of FAK Y397, or inhibition of FAK activity all prevented FAK-p190A association, p190A phosphorylation, and cell polarity.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, FAK Y397 mutation, wound-healing and Golgi reorientation assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, siRNA knockdown, site-directed mutagenesis, and two independent polarity assays in multiple cell types\",\n      \"pmids\": [\"19435801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RGMa binding to its receptor neogenin leads to dephosphorylation of FAK at Tyr-397, which dissociates RASA1 (p120GAP) from FAK. This dissociation increases the interaction between RASA1 and GTP-Ras, leading to Ras inactivation. Knockdown of RASA1 prevents RGMa-induced growth cone collapse and neurite outgrowth inhibition in cortical neurons. RGMa also inactivates Akt through RASA1, and constitutively active Akt rescues RGMa-induced growth cone collapse.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, phosphorylation assays, growth cone collapse assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA knockdown with functional rescue, co-IP demonstrating dynamic complex assembly, multiple downstream readouts\",\n      \"pmids\": [\"19458235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"miR-132 suppresses p120RasGAP (RASA1) expression in endothelial cells, leading to increased Ras activity and induction of neovascularization. A miRNA-resistant version of p120RasGAP reversed the vascular response induced by miR-132. Anti-miR-132 inhibited angiogenesis in wild-type mice but not in mice with inducible deletion of Rasa1, placing RASA1 directly downstream of miR-132 as the effector of the angiogenic switch.\",\n      \"method\": \"miRNA overexpression/antagomir, Rasa1 conditional knockout, rescue with miRNA-resistant RASA1, retinal vascular assay\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with conditional knockout, miRNA-resistant rescue experiment, multiple in vivo and in vitro assays\",\n      \"pmids\": [\"20676106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"p120RasGAP (RASA1) regulates recycling of endocytosed α/β1-integrin heterodimers to the plasma membrane. RASA1 interacts with the cytoplasmic domain of integrin α-subunits via its GAP domain and competes with Rab21 for binding to endocytosed integrins, facilitating exit of integrins from Rab21- and EEA1-positive endosomes. Silencing of RASA1 attenuated integrin recycling and augmented cell motility.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, integrin recycling assay, competitive binding assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA knockdown with functional readout, co-IP identifying GAP domain as binding region, competitive binding mechanism established with multiple orthogonal methods\",\n      \"pmids\": [\"21768288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RASA1 functions as a critical effector downstream of the endothelial receptor EPHB4. In zebrafish, RASA1 or EPHB4 deficiency produce similar vascular abnormalities, and engineered EPHB4 receptors with impaired RASA1-binding fail to rescue blood flow in EPHB4-deficient animals. EPHB4 deficiency leads to robust mTORC1 overactivation, and pharmacological mTORC1 inhibition rescues vessel structure and function, defining an EPHB4/RASA1/mTORC1 signaling axis in endothelial cells.\",\n      \"method\": \"Zebrafish genetic models, engineered receptor rescue, mTORC1 pharmacological inhibition, tissue lysate signaling analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in zebrafish with engineered receptor rescue and pharmacological pathway validation, multiple orthogonal approaches\",\n      \"pmids\": [\"24837431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The SH3 domain of p120RasGAP (RASA1) selectively inhibits the RhoGAP activity of all three DLC isoforms (DLC1-3) by targeting the catalytic arginine finger of the DLC RhoGAP domain, thereby competitively inhibiting RhoGAP activity. This represents an atypical SH3 interaction not following the classical PXXP motif. This cross-talk functionally connects Ras and Rho regulatory pathways.\",\n      \"method\": \"Biochemical RhoGAP activity assay, structural/mutational analysis, SH3 domain competition assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical activity assay with structural and mutational validation, multiple DLC isoforms tested\",\n      \"pmids\": [\"24443565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PTP1B directly dephosphorylates the transcription factor PITX1 at Y160, Y175, and Y179, reducing its protein stability and transcriptional activity toward the RASA1 gene. PTP1B inhibition or silencing upregulates the PITX1-p120RasGAP axis. Sorafenib decreases PTP1B activity, promoting PITX1 hyperphosphorylation and increased RASA1 expression.\",\n      \"method\": \"In vitro dephosphorylation assay, siRNA knockdown, luciferase reporter assay, molecular docking\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro phosphatase assay with site-specific mutations, functional transcriptional readout, single lab\",\n      \"pmids\": [\"26840794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RASA1 regulates the function of lymphatic vessel valves; catalytic (RasGAP) activity is essential for this function. Disruption of Rasa1 in adult mice resulted in loss of lymphatic endothelial cells specifically from collecting lymphatic vessel valve leaflets, preventing backflow prevention and impairing vessel pumping. A catalytically inactive RASA1(R780Q) mutant phenocopied Rasa1 deletion, demonstrating that RasGAP catalytic activity is required.\",\n      \"method\": \"Inducible conditional knockout mice, catalytically inactive knock-in mutant (R780Q), lymphatic vessel functional assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with catalytic-dead knock-in mutant, specific cellular and functional phenotype readout, two complementary mouse models\",\n      \"pmids\": [\"28530642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RASA1 knockdown in human bronchial epithelial cells activates signaling downstream of RAS and promotes cell growth. Restoration of RASA1 expression in RASA1-mutated NSCLC cells reduces MAPK and PI3K signaling. Concurrent genetic silencing of RASA1 and NF1 profoundly sensitizes cells to MEK inhibition (trametinib), indicating that RASA1 and NF1 cooperatively suppress RAS/MAPK signaling.\",\n      \"method\": \"shRNA knockdown, ectopic re-expression, MEK inhibitor sensitivity assay, signaling pathway analysis\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional knockdown and rescue with downstream signaling readout, single lab, multiple cell line models\",\n      \"pmids\": [\"29127119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RASA1 is required in endothelial cells for the export of collagen IV and its deposition in vascular basement membranes during developmental angiogenesis. In the absence of RASA1, dysregulated Ras-MAPK signaling causes impaired folding of collagen IV and its retention in the ER, leading to endothelial cell death. Chemical chaperone 4-PBA and MAPK inhibitors rescued ER retention of collagen IV and EC apoptosis, restoring normal angiogenesis.\",\n      \"method\": \"Multiple conditional knockout mouse models, pharmacological rescue (4-PBA, MAPK inhibitors, collagen-modifying enzyme inhibitors), ER retention assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple murine models, pharmacological rescue with mechanistic specificity, orthogonal approaches establishing ER retention mechanism\",\n      \"pmids\": [\"31185000\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RASA1 (p120RasGAP) is a multi-domain RasGTPase-activating protein that accelerates GTP hydrolysis on Ras (via an arginine-finger mechanism defined crystallographically) to terminate Ras signaling; it is recruited to the plasma membrane and focal adhesions through SH2-domain interactions with phosphotyrosine proteins (including FAK and receptor/non-receptor tyrosine kinases), where it forms complexes with p190RhoGAP (facilitating Rho inactivation and cell polarity), annexin A6, and integrin α-subunits (regulating integrin recycling); its catalytic activity is essential for lymphatic valve endothelial cell survival and function, for collagen IV export during vascular development, and for suppression of mTORC1 in an EPHB4/RASA1/mTORC1 endothelial signaling axis, with its expression transcriptionally controlled by the PITX1/PTP1B axis and post-transcriptionally suppressed by miRNAs including miR-132, miR-223, and miR-21.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RASA1 (p120RasGAP) is a multi-domain GTPase-activating protein that terminates Ras signaling by accelerating GTP hydrolysis on Ras, with its catalytic GAP domain forming a shallow groove that engages Ras·GTP [#0]. Its activity is regulated by tyrosine phosphorylation: oncogenic and receptor tyrosine kinases (v-src, v-fps, EGFR, bcr/abl) and cytokine receptors (erythropoietin) phosphorylate RASA1 and inhibit its GAP activity, permitting Ras activation, while its SH2 domains recruit it into phosphotyrosine-dependent complexes [#1, #2, #3]. RASA1 is dynamically targeted to membranes and adhesion sites: annexin A6 directs Ca2+-dependent plasma membrane localization that restrains Ras/Raf activation [#8], and integrin- and FAK-mediated cues recruit RASA1 with p190RhoGAP to focal adhesions, where SH2-mediated binding to FAK (at Tyr397) drives p190RhoGAP activation and establishes cell polarity during migration [#5, #9, #10]. This coupling extends to neuronal guidance, where RGMa-neogenin signaling dephosphorylates FAK Y397 to release RASA1 onto Ras and mediate growth cone collapse [#11]. RASA1 also bridges Ras and Rho regulation through its SH3 domain, which inhibits the RhoGAP activity of DLC1-3 by targeting their catalytic arginine finger [#15], and regulates integrin recycling by competing with Rab21 for endocytosed integrin α-subunits via its GAP domain [#13]. In the vasculature, RASA1 acts as a critical effector of EPHB4 to suppress mTORC1 [#14], is required for lymphatic valve endothelial cell survival in a catalytic-activity-dependent manner [#17], and enables collagen IV export from the ER during angiogenesis by restraining Ras-MAPK signaling [#19]. As a RAS/MAPK suppressor, RASA1 cooperates with NF1 to limit RAS signaling, and its expression is controlled by the PITX1/PTP1B axis transcriptionally and by miR-132 post-transcriptionally [#16, #18, #12].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Established that RASA1 is a substrate and binding partner of tyrosine kinases, defining how its SH2-containing complex links growth factor and oncogene signaling to Ras.\",\n      \"evidence\": \"Tyrosine phosphorylation assay and co-IP in v-src/v-fps-transformed and EGF-stimulated cells, identifying co-precipitating p62 and p190\",\n      \"pmids\": [\"1689011\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of phosphorylation on GAP activity not directly measured here\", \"Identity of p62/p190 not molecularly resolved\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Showed that tyrosine phosphorylation of RASA1 functionally inhibits its GAP activity, providing a mechanism for receptor-driven Ras activation.\",\n      \"evidence\": \"In vitro GTP hydrolysis assay with phosphorylation analysis after erythropoietin stimulation of HEL cells\",\n      \"pmids\": [\"1569084\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlative link between phosphorylation and GAP inhibition, not causal residue mapping\", \"Single cell-lysate-based activity readout\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Extended the kinase-regulation model to leukemogenic bcr/abl, demonstrating reversible suppression of RASA1 GAP activity tied to Ras activation.\",\n      \"evidence\": \"GTPase activity assay with antisense knockdown of p210bcr/abl in CML cells\",\n      \"pmids\": [\"8195713\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting kinase activity to GAP inhibition not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Provided the structural basis for catalysis, revealing the Ras·GTP interaction surface on the GAP domain.\",\n      \"evidence\": \"X-ray crystallography of GAP-334 with functional mapping of conserved residues\",\n      \"pmids\": [\"8955277\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-crystal with Ras in this structure\", \"Regulatory domains outside GAP not structurally characterized\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Identified the CaLB/C2 domain as a membrane-targeting module through direct annexin VI binding.\",\n      \"evidence\": \"In vitro binding with isolated CaLB domain and co-IP in rat fibroblasts\",\n      \"pmids\": [\"8798684\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence for Ras signaling not tested here\", \"Single lab\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated integrin-driven relocalization of RASA1 with p190RhoGAP and FAK to cytoskeletal signaling complexes, linking adhesion to Ras/Rho regulation.\",\n      \"evidence\": \"Subcellular fractionation and Western blot after plating on ECM proteins\",\n      \"pmids\": [\"9690509\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Fractionation-based, no direct imaging of complex\", \"Functional output of recruitment not assessed\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Placed RASA1 in a CD4/lck-dependent signaling complex with Sam68 and PLCγ1 in T cells.\",\n      \"evidence\": \"Co-IP across CD4+/CD4- T cell lines and CD4/lck-binding mutants\",\n      \"pmids\": [\"9743338\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding partner within the complex not resolved\", \"Downstream signaling consequence untested\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined PH and C2/CaLB domains as a docking site for the PKC scaffold RACK1, regulated by Ser/Thr phosphorylation.\",\n      \"evidence\": \"In vitro pulldown with domain-deletion mutants and recombinant RACK1 plus co-IP\",\n      \"pmids\": [\"11350068\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of RACK1-RASA1 complex unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Established annexin A6 as a Ca2+-dependent driver of RASA1 membrane targeting that dampens Ras/Raf-1 activation.\",\n      \"evidence\": \"Live-cell imaging, in vitro membrane binding, RNAi knockdown, and Ras activation assay\",\n      \"pmids\": [\"15940262\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution of annexin A6 versus other targeting modules unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed that integrin/Arg-kinase signaling activates p190RhoGAP through RASA1 binding and peripheral recruitment, coupling RASA1 to Rho inactivation.\",\n      \"evidence\": \"In vitro RhoGAP assay, dominant-negative p120 fragment, co-IP, and immunofluorescence\",\n      \"pmids\": [\"16971514\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"p120 binding does not directly activate p190 in vitro; the activating step remains indirect\", \"Precise localization signal not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolved how FAK assembles a RASA1/p190RhoGAP complex at leading-edge adhesions to set cell polarity during migration.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, FAK Y397 mutation, and wound-healing/Golgi reorientation assays\",\n      \"pmids\": [\"19435801\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of RasGAP versus scaffolding function in polarity not separated\", \"Ras-GTP changes not directly measured\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated dynamic FAK-RASA1 dissociation as the switch that converts RGMa-neogenin signaling into Ras and Akt inactivation and growth cone collapse.\",\n      \"evidence\": \"siRNA knockdown with functional rescue, co-IP, phosphorylation assays, growth cone collapse assay in cortical neurons\",\n      \"pmids\": [\"19458235\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct measurement of RASA1-Ras complex stoichiometry absent\", \"In vivo relevance to axon guidance not tested here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Placed RASA1 directly downstream of miR-132 as the effector of an angiogenic switch in endothelial cells.\",\n      \"evidence\": \"miRNA overexpression/antagomir, Rasa1 conditional knockout, miRNA-resistant RASA1 rescue, and retinal vascular assay\",\n      \"pmids\": [\"20676106\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other miR-132 targets contributing to angiogenesis not excluded\", \"Mechanism downstream of Ras in this context not detailed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Uncovered a non-catalytic role: RASA1 promotes integrin recycling by competing with Rab21 for endocytosed integrin α-subunits via its GAP domain.\",\n      \"evidence\": \"siRNA knockdown, co-IP, integrin recycling and competitive binding assays\",\n      \"pmids\": [\"21768288\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GAP catalytic activity is required for the recycling function unresolved\", \"In vivo physiological role not addressed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined an EPHB4/RASA1/mTORC1 endothelial signaling axis, showing RASA1 as the key EPHB4 effector suppressing mTORC1 for vessel formation.\",\n      \"evidence\": \"Zebrafish genetic models, engineered RASA1-binding-impaired EPHB4 receptors, and mTORC1 pharmacological rescue\",\n      \"pmids\": [\"24837431\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link from RASA1 to mTORC1 suppression not detailed\", \"Reliance on zebrafish for in vivo conclusions\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed an atypical SH3-mediated cross-talk in which RASA1 inhibits DLC1-3 RhoGAP activity, functionally linking Ras and Rho pathway regulation.\",\n      \"evidence\": \"Biochemical RhoGAP activity assay with structural/mutational analysis of the catalytic arginine finger\",\n      \"pmids\": [\"24443565\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular consequences of DLC inhibition by RASA1 not established here\", \"Physiological contexts for this cross-talk unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified transcriptional control of RASA1 through the PTP1B/PITX1 axis, with PTP1B dephosphorylation destabilizing PITX1 and lowering RASA1 expression.\",\n      \"evidence\": \"In vitro dephosphorylation assay with site-specific PITX1 mutants, luciferase reporter, and siRNA knockdown\",\n      \"pmids\": [\"26840794\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct PITX1 occupancy of the RASA1 promoter not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated that RasGAP catalytic activity is essential for lymphatic valve endothelial cell survival and valve function.\",\n      \"evidence\": \"Inducible conditional knockout and catalytically inactive R780Q knock-in mice with lymphatic functional assays\",\n      \"pmids\": [\"28530642\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream receptor driving this requirement not defined here\", \"Molecular cause of valve cell death not detailed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established RASA1 as a tumor-suppressive RAS regulator cooperating with NF1, with restoration reducing MAPK/PI3K signaling.\",\n      \"evidence\": \"shRNA knockdown, ectopic re-expression, and MEK inhibitor sensitivity in bronchial epithelial and NSCLC cells\",\n      \"pmids\": [\"29127119\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of RASA1-NF1 cooperativity not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked RASA1 loss to ER retention of collagen IV via dysregulated Ras-MAPK, explaining endothelial cell death in vascular development.\",\n      \"evidence\": \"Multiple conditional knockout mouse models with pharmacological rescue (4-PBA, MAPK inhibitors) and ER retention assays\",\n      \"pmids\": [\"31185000\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Ras-MAPK signaling impairs collagen IV folding mechanistically unresolved\", \"Generality beyond collagen IV not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RASA1's catalytic, scaffolding, and membrane-targeting functions are integrated and selectively deployed across distinct vascular, lymphatic, neuronal, and immune contexts remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model distinguishing GAP-dependent versus GAP-independent roles in vivo\", \"Direct structural basis for RASA1 regulation by phosphorylation absent\", \"Mechanistic link from RASA1 to mTORC1 and to collagen IV folding unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 3, 15, 17]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 15]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [10, 11, 14]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [4, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [9, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 8]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [5, 9, 10]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 11, 14, 18]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [12, 14, 17, 19]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 18]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"complexes\": [\"FAK-RASA1-p190RhoGAP focal adhesion complex\"],\n    \"partners\": [\"FAK\", \"ARHGAP35\", \"ANXA6\", \"RACK1\", \"KHDRBS1\", \"EPHB4\", \"DLC1\", \"ITGA1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}