{"gene":"BCAR3","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":1998,"finding":"BCAR3 was identified as a novel SH2 domain-containing protein; retrovirus-mediated insertional mutagenesis revealed that transfer of the BCAR3 locus by cell fusion or transfection of BCAR3 cDNA into ZR-75-1 and MCF-7 breast cancer cells induces antiestrogen (tamoxifen) resistance.","method":"Retrovirus-mediated insertional mutagenesis, cell fusion, cDNA transfection","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — foundational gain-of-function experiment replicated across two cell lines using two orthogonal approaches (cell fusion and cDNA transfection)","pmids":["9582273"],"is_preprint":false},{"year":1999,"finding":"AND-34/BCAR3 contains an N-terminal SH2 domain and a C-terminal GDP-exchange factor (GEF)-like domain; it undergoes tyrosine phosphorylation upon serum stimulation or cell adhesion to fibronectin/poly-L-lysine, and co-precipitates with the focal adhesion protein p130Cas (as well as 95- and 125-kDa tyrosine-phosphorylated proteins) in NIH3T3 fibroblasts.","method":"Co-immunoprecipitation, tyrosine phosphorylation assay, sequence analysis, Western blotting","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, co-IP plus phosphorylation assay, consistent with later work","pmids":["10438950"],"is_preprint":false},{"year":2000,"finding":"AND-34/BCAR3 displays GEF activity on RalA, Rap1A, and R-Ras (but not Ha-Ras) GTPases in cells. Efficient binding of AND-34 to p130Cas requires both the Src-binding domain and a flanking C-terminal region of p130Cas. The AND-34 GEF domain contains the p130Cas-binding site. Overexpression of p130Cas (but not a mutant unable to bind AND-34) inhibits AND-34's Ral GEF activity, indicating p130Cas negatively regulates AND-34 GEF function.","method":"GEF activity assay in cells (RalA/Rap1A/R-Ras activation), co-immunoprecipitation with binding-domain mutants, overexpression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — GEF activity demonstrated in cells, binding-domain mapping with mutants, multiple GTPase substrates tested, consistent with structural studies","pmids":["10896938"],"is_preprint":false},{"year":2003,"finding":"AND-34/BCAR3 overexpression activates Rho-family GTPases Cdc42 and Rac in epithelial cells; BCAR3 overexpression induces F-actin redistribution, augments PAK1 autophosphorylation and kinase activity, and activates the cyclin D1 promoter (proximal 163 bp) via a Rac1- and PAK1-dependent pathway, conferring antiestrogen resistance.","method":"GTPase activation assays, F-actin staining, PAK1 kinase assay, cyclin D1 promoter-luciferase reporter, dominant-negative Rac1/PAK1, stable transfection","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays (GTPase, kinase, reporter, dominant-negatives) in single rigorous study","pmids":["14583477"],"is_preprint":false},{"year":2003,"finding":"AND-34/BCAR3 functions synergistically with p130Cas to enhance c-Src kinase activity and promote cell migration; the C-terminal GEF domain of AND-34 and activity of its target Rap1 contribute to these events. AND-34 overexpression redistributes p130Cas from focal adhesions to lamellipodia at the leading edge.","method":"Co-immunoprecipitation, Src kinase assay, cell migration assay, immunofluorescence localization, Rap1 activity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (kinase assay, migration, localization, GTPase), mechanistic follow-through with domain mutants","pmids":["12740391"],"is_preprint":false},{"year":2003,"finding":"AND-34/BCAR3 is expressed in splenic B cells and associates with both p130Cas and HEF1 via its GEF domain binding to the HEF1 C-terminus. Overexpression in B cell lines specifically activates Cdc42 (but not Rac, Rho, RalA, or Rap1), induces PAK1 activation, and inhibits SDF-1α-induced B cell polarization.","method":"Co-immunoprecipitation, GTPase activation assays, PAK1 kinase assay, morphology (actin staining), functional polarization assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, multiple GTPase assays, functional polarization readout; single lab","pmids":["12517963"],"is_preprint":false},{"year":2005,"finding":"Both the GEF-like domain and the SH2 domain of AND-34/BCAR3 are required for Rac activation and for conferring resistance to the ER antagonist ICI 182,780. BCAR3 overexpression increases PI3K activity and augments Akt Ser473 phosphorylation/kinase activity; PI3K inhibition (LY294002 or dominant-negative p85) blocks BCAR3-mediated Rac and Akt activation. BCAR3-induced antiestrogen resistance is ER-alpha-independent. Rac inhibitor NSC23766 abrogates resistance.","method":"Domain-deletion/mutation analysis, PI3K activity assay, Akt phosphorylation/kinase assay, Rac activation assay, pharmacological inhibition, stable transfection","journal":"Molecular cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal assays (PI3K, Akt, Rac), domain mutants, pharmacological inhibitors, single rigorous study","pmids":["15671247"],"is_preprint":false},{"year":2008,"finding":"Structural analysis (SAXS) revealed that the NSP-binding domain of HEF1 forms a four-helix bundle, and the Cas-binding domain of BCAR3 adopts a Cdc25-like GEF fold. HEF1 binds very tightly to a site on BCAR3 that is remote from the putative GTPase-binding site of the GEF domain but analogous to an allosteric regulatory site in SOS, suggesting that Cas family binding may allosterically modulate BCAR3 GEF activity.","method":"Small-angle X-ray scattering (SAXS), structural modeling, binding analysis","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — SAXS structural data; allosteric modulation is proposed from structure without direct in vitro reconstitution of GEF activity change","pmids":["19103205"],"is_preprint":false},{"year":2009,"finding":"BCAR3 regulates c-Src kinase activity and the Src-p130Cas interaction in endogenous breast cancer cells. Using gain- and loss-of-function approaches, BCAR3 was shown to control both the quantity and quality of the Src-Cas association, and the coordinated activity of BCAR3/Cas/Src contributes to breast cancer cell adhesion signaling and spreading.","method":"Gain- and loss-of-function (overexpression and siRNA knockdown), co-immunoprecipitation, Src kinase assay, cell adhesion/spreading assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — endogenous setting, reciprocal gain/loss-of-function, multiple orthogonal readouts (kinase assay, co-IP, functional adhesion)","pmids":["19940159"],"is_preprint":false},{"year":2009,"finding":"Pyk2 activation by endothelin-1 in glomerular mesangial cells leads to p130Cas phosphorylation and enhanced p130Cas-BCAR3 complex formation; BCAR3 then activates Rap1 (but not RhoA or Ras). siRNA knockdown of BCAR3 significantly decreases ET-1-induced Rap1 activation, placing BCAR3 downstream of Pyk2/p130Cas and upstream of Rap1 in this signaling axis.","method":"siRNA knockdown, dominant-interfering Pyk2 (CRNK), GTP-loading (Rap1, RhoA) assay, co-immunoprecipitation, adenovirus-mediated gene transfer","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis established by dominant-negative + siRNA, multiple downstream GTPases tested, two orthogonal loss-of-function approaches","pmids":["19086031"],"is_preprint":false},{"year":2009,"finding":"BCAR3 overexpression in breast cancer cells induces adhesion-dependent serine phosphorylation of p130Cas (at Ser139, Ser437, Ser639 identified by mass spectrometry). BCAR3 knockdown abolishes this phosphorylation, alters p130Cas localization, and converts MDA-231 growth to a cohesive epithelioid pattern lacking cellular projections. The BCAR3 serine/proline-rich domain is necessary for this p130Cas serine phosphorylation.","method":"Mass spectrometry phospho-site identification, phospho-amino acid analysis, inducible shRNA knockdown, immunofluorescence, domain-swap chimeras","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 1 / Strong — mass spectrometry site identification combined with domain-swap and loss-of-function experiments; multiple orthogonal methods","pmids":["19454314"],"is_preprint":false},{"year":2009,"finding":"Loss of AND-34/BCAR3 in knockout mice causes posterior lens rupture beginning at ~3 weeks of age. Akt Ser473 phosphorylation and basal p130Cas phosphorylation are markedly reduced in BCAR3-null lens epithelial cells, demonstrating that BCAR3 is required for Akt and focal adhesion signaling in lens epithelium to maintain structural integrity.","method":"Homologous recombination knockout mice, histopathology, Western blotting (Akt phosphorylation, p130Cas phosphorylation), in situ hybridization","journal":"Molecular vision","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with specific molecular (Akt, p130Cas phosphorylation) and phenotypic (lens rupture) readouts","pmids":["19365570"],"is_preprint":false},{"year":2011,"finding":"Using the p130Cas-binding point mutant R743A BCAR3, BCAR3-p130Cas complex formation was shown to be dispensable for BCAR3-mediated antiestrogen resistance, Rac activation, and epithelial cell discohesion, but required for optimal cell motility. While BCAR3 can signal independently of p130Cas for most functions, complex formation with other CAS family members (not p130Cas per se) is required for lamellipodia formation and motility in p130Cas-null MEFs.","method":"Point-mutant (R743A) overexpression, p130Cas-null MEFs, Rac activation assay, cell motility assay, lamellipodia formation assay, antiestrogen resistance assay","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 2 / Strong — structure-function dissection with point mutant, multiple endpoints, genetic KO cells used for epistasis","pmids":["21262352"],"is_preprint":false},{"year":2012,"finding":"BCAR3 augments the binding of the c-Src SH3 domain to p130Cas via an RPLPSPP motif in the p130Cas Src-binding domain (SBD), in a manner dependent on the BCAR3-p130Cas complex. BCAR3-induced tyrosine phosphorylation of the p130Cas substrate domain (Src-dependent) is reduced by the R743A mutation blocking BCAR3-p130Cas association. Immunofluorescence shows BCAR3 co-localizes with p130Cas and Src.","method":"GST pulldown, co-immunoprecipitation, site-directed mutagenesis (R743A BCAR3, RPLPSPP motif), immunofluorescence co-localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — GST pulldown + co-IP + mutagenesis + localization, single lab with multiple orthogonal methods","pmids":["22711540"],"is_preprint":false},{"year":2012,"finding":"PTPα phospho-Tyr789 serves as the first identified cellular ligand for the BCAR3 SH2 domain, recruiting the BCAR3-Cas complex to integrin-mediated focal adhesions. In PTPα-null cells, reconstitution with wild-type PTPα (but not Y789F mutant) restores PTPα and Cas localization to adhesions and Src-mediated Cas phosphorylation, defining a PTPα→BCAR3→Cas→Src signaling axis at adhesions.","method":"PTPα-null cell reconstitution, SH2 domain binding assay, immunofluorescence/co-localization, phospho-specific antibodies, mutagenesis (Y789F)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — null cell reconstitution with point mutant, identifies first cellular SH2 ligand for BCAR3, multiple orthogonal experiments","pmids":["22801373"],"is_preprint":false},{"year":2013,"finding":"In invasive breast cancer cells, BCAR3 is necessary for membrane protrusiveness, Rac1 activity, and adhesion disassembly. BCAR3 depletion shifts the Rac1/RhoA balance toward RhoA, leading to increased ROCK-mediated myosin light chain II phosphorylation and formation of large ROCK/mDia1-dependent focal adhesions, establishing BCAR3 as a positive regulator of cytoskeletal remodeling through Rac1/RhoA balance.","method":"siRNA knockdown (loss-of-function), Rac1 and RhoA activity assays, myosin light chain phosphorylation measurement, ROCK inhibitor, focal adhesion analysis by immunofluorescence","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean loss-of-function with multiple orthogonal molecular and cellular readouts, pharmacological validation","pmids":["23762409"],"is_preprint":false},{"year":2014,"finding":"BCAR3-induced antiestrogen resistance in MCF7 cells critically depends on its physical interaction with BCAR1/p130CAS (shown using structure-based interaction mutants). BCAR3 binding to BCAR1 increases phospho-BCAR1 levels. BCAR1/BCAR3 co-overexpression correlates with increased ERK1/2 activity, and inhibition of ERK1/2 via PEA15 overexpression negates resistance, revealing ERK1/2 as a key effector downstream of the BCAR1-BCAR3 complex.","method":"Structure-based interaction mutants, co-immunoprecipitation, phosphoprotein detection, ERK1/2 kinase pathway analysis, PEA15 overexpression, antiestrogen resistance assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — structure-guided mutagenesis, multiple downstream pathway readouts, ERK1/2 epistasis established with functional rescue/inhibition","pmids":["24584939"],"is_preprint":false},{"year":2008,"finding":"BCAR3 SH2 domain directly associates with activated EGF receptor and Cas in MCF-12A cells; microinjection of anti-BCAR3 antibody or BCAR3 siRNA inhibits EGF-induced DNA synthesis, and overexpression of BCAR3 alone induces DNA synthesis, placing BCAR3 as a positive mediator of EGF mitogenic signaling and cell cycle progression.","method":"Co-immunoprecipitation, microinjection of antibody/siRNA/expression plasmid, DNA synthesis assay ([3H]thymidine incorporation)","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — microinjection loss/gain-of-function plus co-IP; single lab, single study","pmids":["18722344"],"is_preprint":false},{"year":2021,"finding":"BCAR3 localizes to integrin adhesions in a Cas-dependent manner; in return, Cas phosphorylation, lamellipodia dynamics, and cell migration require the BCAR3 SH2 domain and BCAR3 Tyr117 phosphorylation. Tyr117 phosphorylation also targets BCAR3 for degradation by the ubiquitin-proteasome system, creating a regulatory negative-feedback loop. This places BCAR3 and Cas in a co-regulatory positive-feedback circuit at adhesions.","method":"Live-cell imaging, FRAP, phospho-site mutagenesis (Y117), proteasome inhibitor experiments, Cas knockout cells, site-directed mutagenesis of SH2 domain","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — phospho-site mutagenesis, genetic KO cells, live imaging, proteasome pathway characterization, multiple orthogonal methods in single rigorous study","pmids":["34169835"],"is_preprint":false},{"year":2013,"finding":"BCAR3 mediates ERK activation and DNA synthesis in response to insulin (but not IGF-1) in MCF-12A cells via its SH2 domain; BCAR3 inhibition suppresses insulin-induced membrane ruffling but not GLUT4 translocation, defining a specific role for BCAR3 in insulin-stimulated cell cycle progression and cytoskeletal reorganization.","method":"Microinjection of inhibitory antibody/siRNA, ERK activation assay, DNA synthesis assay, GLUT4 translocation assay, SH2 domain blocking","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — microinjection loss-of-function with multiple specific readouts; single lab","pmids":["24216110"],"is_preprint":false},{"year":2024,"finding":"BCAR3 expression in macrophages is regulated by Stat6, while in fibroblasts it is regulated by TGFβR1/Smad3. BCAR3 amplifies the IL-4/Stat6 pathway in macrophages and the TGF-β/Smad3 pathway in fibroblasts, supporting a synergistic macrophage-fibroblast crosstalk loop that drives pulmonary fibrosis. siRNA-mediated silencing of Bcar3 protects mice from fibrosis in two models.","method":"siRNA knockdown, Stat6/Smad3 pathway analysis (Western blot), in vivo fibrosis models (bleomycin, FITC), human precision-cut lung slices, flow cytometry","journal":"International journal of nanomedicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KD with two animal models and ex vivo human tissue; pathway signaling measured; single lab","pmids":["38414524"],"is_preprint":false},{"year":2025,"finding":"BCAR3 promotes intrinsic cisplatin resistance in head and neck squamous cell carcinoma by sustaining TGF-β/SMAD signaling: BCAR3 increases phosphorylation of SMAD2 and facilitates transcriptional activation of SMAD4, suppressing mitochondria-derived apoptosis. Inhibition of TGF-β/SMAD signaling with galunisertib synergizes with cisplatin.","method":"Transcriptome analysis, Western blotting (pSMAD2, SMAD4), flow cytometry (apoptosis), BCAR3 knockdown in vitro and in vivo, pharmacological TGFβRI inhibition (galunisertib)","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function, molecular pathway readouts, pharmacological epistasis; single lab","pmids":["40935299"],"is_preprint":false},{"year":2016,"finding":"A spontaneous 1-bp insertion in exon 7 of Bcar3 (producing a premature stop codon and truncated protein) in CF#1/lr mice causes autosomal recessive lens extrusion cataracts, independently confirming that BCAR3 loss disrupts lens integrity in vivo (consistent with the AND-34 knockout model).","method":"Whole-genome mapping, Sanger sequencing, histopathology, genetic complementation analysis","journal":"Mammalian genome","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — independent spontaneous mouse mutant confirms KO lens phenotype; sequencing confirms loss-of-function allele","pmids":["27364350"],"is_preprint":false},{"year":2006,"finding":"CrkII associates with BCAR3 in human glomerular mesangial cells; ET-1 treatment time-dependently increases CrkII-BCAR3 complex formation, and this association is Pyk2-dependent (dominant-interfering Pyk2 reduces CrkII-BCAR3 association), placing BCAR3 downstream of Pyk2 and upstream of CrkII in ET-1 signaling.","method":"Co-immunoprecipitation, adenovirus-mediated dominant-interfering Pyk2 expression, ET-1 stimulation time-course","journal":"Experimental biology and medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP experiment, single lab, no in vitro reconstitution","pmids":["16740993"],"is_preprint":false},{"year":2021,"finding":"BCAR3 participates in a pathway with the MET receptor to control proliferation and migration of triple-negative breast cancer cells; BCAR3 knockdown reduces tumor growth in orthotopic mouse models. In some TNBC backgrounds, BCAR3 activates an autocrine HGF loop to sustain MET signaling.","method":"siRNA/shRNA knockdown, orthotopic mouse tumor models, RNA expression database correlation, HGF/MET signaling assays, proliferation and migration assays","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function combined with pathway analysis; single lab; autocrine loop supported by expression data","pmids":["34765292"],"is_preprint":false},{"year":2026,"finding":"BCAR3 knockdown in thyroid cancer cells reduces AKT/mTOR phosphorylation and shifts EMT markers (increases E-cadherin, decreases vimentin and N-cadherin), suppressing proliferation, migration, and invasion; partial rescue with a PI3K activator supports BCAR3 acting upstream of PI3K/AKT/mTOR to promote EMT and invasive behavior.","method":"shRNA knockdown, Western blot (AKT/mTOR phosphorylation, EMT markers), proliferation/migration/invasion assays, PI3K activator rescue experiment","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with molecular and functional readouts, pharmacological rescue; single lab, incomplete rescue in PI3K rescue experiment","pmids":["41595187"],"is_preprint":false}],"current_model":"BCAR3 is a cytoplasmic adaptor/scaffold protein containing an N-terminal SH2 domain (which binds phospho-Tyr789 of PTPα and activated EGF/insulin receptors) and a C-terminal Cdc25-like GEF domain (which binds p130Cas/BCAR1 and HEF1/NEDD9 and exhibits GEF activity toward Ral, Rap1, and R-Ras GTPases); it forms a co-regulatory positive-feedback circuit with p130Cas at integrin adhesions—where Cas recruits BCAR3 and BCAR3 in return promotes Cas phosphorylation, Rac1 activation, and lamellipodia dynamics—while also amplifying c-Src kinase activity, activating a PI3K→Rac1→PAK1→cyclin D1 axis, and engaging ERK1/2 downstream of the BCAR1/BCAR3 complex to confer antiestrogen resistance in breast cancer cells, with BCAR3 activity regulated by ubiquitin-proteasome-mediated degradation gated on Tyr117 phosphorylation."},"narrative":{"mechanistic_narrative":"BCAR3 (AND-34) is a cytoplasmic SH2- and Cdc25-like GEF-domain adaptor that couples integrin and growth-factor signaling to Rho-family GTPase activation and cytoskeletal remodeling, and was originally isolated as a gain-of-function inducer of antiestrogen (tamoxifen) resistance in breast cancer cells [PMID:9582273, PMID:15671247]. Its C-terminal GEF domain binds the focal adhesion proteins p130Cas/BCAR1 and HEF1/NEDD9 and exhibits exchange activity toward RalA, Rap1A, and R-Ras, while p130Cas binding to the GEF domain negatively regulates this activity [PMID:10438950, PMID:10896938, PMID:12517963]; structural analysis places the Cas-family binding site at a position analogous to the allosteric regulatory site of SOS [PMID:19103205]. Functionally, BCAR3 forms a co-regulatory positive-feedback circuit with Cas at integrin adhesions—Cas recruits BCAR3, and BCAR3 in turn promotes Cas tyrosine and serine phosphorylation, augments the c-Src SH3 interaction with Cas, and drives Rac1 activation, lamellipodia dynamics, and adhesion turnover, with its own activity gated by Tyr117 phosphorylation that targets it for ubiquitin-proteasome degradation [PMID:19940159, PMID:19454314, PMID:22711540, PMID:34169835]. BCAR3 sets the Rac1/RhoA balance toward protrusive, migratory behavior [PMID:23762409], and its SH2 domain binds PTPα phospho-Tyr789 to localize the BCAR3–Cas complex to adhesions and direct Src-mediated Cas phosphorylation [PMID:22801373]. Downstream, BCAR3 engages a PI3K→Rac1→PAK1→cyclin D1 axis and ERK1/2 to confer ER-independent antiestrogen resistance, the latter dependent on its physical interaction with BCAR1 [PMID:14583477, PMID:15671247, PMID:24584939]. Genetic loss of BCAR3 in mice causes posterior lens rupture/extrusion cataracts with reduced Akt and Cas phosphorylation, establishing a requirement for BCAR3 in focal adhesion signaling that maintains lens epithelial integrity [PMID:19365570, PMID:27364350]. Beyond these roles, BCAR3 mediates EGF- and insulin-stimulated cell cycle progression [PMID:18722344, PMID:24216110] and has been implicated in TGF-β/SMAD- and PI3K/AKT-driven programs underlying fibrosis and therapy resistance in several cancers [PMID:38414524, PMID:40935299, PMID:34765292, PMID:41595187].","teleology":[{"year":1998,"claim":"Established BCAR3 as a causal driver of antiestrogen resistance, answering whether a single locus could confer tamoxifen escape in breast cancer cells.","evidence":"Retrovirus-mediated insertional mutagenesis with cell fusion and cDNA transfection in ZR-75-1 and MCF-7 cells","pmids":["9582273"],"confidence":"High","gaps":["No mechanism or domain function defined at this stage","No endogenous partners identified"]},{"year":1999,"claim":"Defined the modular architecture (N-terminal SH2, C-terminal GEF-like domain) and first linked BCAR3 to adhesion signaling via p130Cas, addressing how the protein might transduce signals.","evidence":"Sequence analysis, co-IP, and tyrosine phosphorylation assays in NIH3T3 fibroblasts","pmids":["10438950"],"confidence":"Medium","gaps":["GEF substrates untested","Functional consequence of Cas binding unknown"]},{"year":2000,"claim":"Demonstrated BCAR3 GEF activity toward RalA, Rap1A, and R-Ras and mapped p130Cas binding to the GEF domain, while showing Cas negatively regulates exchange activity—revealing a built-in regulatory logic.","evidence":"Cellular GEF activation assays and binding-domain mutant co-IPs with overexpression","pmids":["10896938"],"confidence":"High","gaps":["No in vitro reconstitution of intrinsic exchange activity","Physiological GTPase target context not resolved"]},{"year":2003,"claim":"Connected BCAR3 to Rho-family (Cdc42/Rac) activation, PAK1, and cyclin D1 transcription, and showed synergy with p130Cas in Src activation and migration—mechanistically explaining its proliferative and motility effects.","evidence":"GTPase and PAK1 kinase assays, cyclin D1 reporter with dominant-negatives, Src kinase and migration assays in epithelial cells","pmids":["14583477","12740391","12517963"],"confidence":"High","gaps":["Cell-type-specific GTPase selectivity not reconciled","Direct vs indirect GEF action on Rac/Cdc42 unresolved"]},{"year":2005,"claim":"Showed both SH2 and GEF domains are required for Rac activation and resistance, and placed PI3K→Akt upstream of Rac in an ER-independent resistance pathway.","evidence":"Domain mutants, PI3K/Akt assays, Rac assays, and pharmacological inhibition (LY294002, NSC23766) in stable transfectants","pmids":["15671247"],"confidence":"High","gaps":["How SH2 and GEF domains cooperate mechanistically not defined","Direct PI3K-activating event not identified"]},{"year":2008,"claim":"Provided structural insight that the Cas-binding site lies at a SOS-like allosteric position, framing how Cas-family binding could modulate GEF output.","evidence":"SAXS and structural modeling of the BCAR3 GEF and HEF1 binding domains","pmids":["19103205"],"confidence":"Medium","gaps":["Allosteric modulation not confirmed by in vitro GEF reconstitution","No high-resolution complex structure"]},{"year":2008,"claim":"Linked the BCAR3 SH2 domain to activated EGFR and showed BCAR3 is required for EGF-induced DNA synthesis, extending its role to growth-factor mitogenic signaling.","evidence":"Co-IP and microinjection of antibody/siRNA/plasmid with thymidine incorporation in MCF-12A cells","pmids":["18722344"],"confidence":"Medium","gaps":["Single-lab microinjection approach","Direct EGFR phosphosite for SH2 binding not mapped"]},{"year":2009,"claim":"Established BCAR3 control over the Src–Cas association in endogenous cells and identified BCAR3-driven adhesion-dependent serine phosphorylation of specific p130Cas sites, defining how BCAR3 shapes Cas signaling quality.","evidence":"Gain/loss-of-function, Src kinase and adhesion assays, and mass-spectrometry phosphosite mapping with domain-swap chimeras in breast cancer cells","pmids":["19940159","19454314"],"confidence":"High","gaps":["Kinase responsible for Cas serine phosphorylation not identified","Functional consequence of each phosphosite unresolved"]},{"year":2009,"claim":"Placed BCAR3 in a defined Pyk2/p130Cas→BCAR3→Rap1 axis downstream of endothelin-1 in mesangial cells, providing receptor-level epistasis.","evidence":"siRNA, dominant-interfering Pyk2, GTP-loading assays, and co-IP in glomerular mesangial cells","pmids":["19086031"],"confidence":"High","gaps":["Tissue specificity of Rap1 selectivity not generalized","Downstream effectors of Rap1 here undefined"]},{"year":2009,"claim":"Defined an in vivo requirement for BCAR3 in lens epithelial integrity through Akt and Cas signaling, moving beyond cell-line phenotypes.","evidence":"Knockout mice with histopathology and Western blotting of Akt and p130Cas phosphorylation","pmids":["19365570"],"confidence":"High","gaps":["Cell-autonomous mechanism of lens rupture not fully dissected","Other tissue phenotypes not surveyed"]},{"year":2011,"claim":"Dissected which functions require physical BCAR3–p130Cas complex formation, showing complex formation is dispensable for resistance/Rac but required for optimal motility and (via other Cas members) lamellipodia.","evidence":"R743A point mutant in p130Cas-null MEFs with Rac, motility, lamellipodia, and resistance assays","pmids":["21262352"],"confidence":"High","gaps":["Identity of the alternative Cas-family partner driving motility not pinned down","Cas-independent signaling route undefined"]},{"year":2012,"claim":"Explained mechanistically how BCAR3 enhances Src–Cas signaling, by augmenting c-Src SH3 binding to an RPLPSPP motif in the Cas SBD, and identified PTPα pTyr789 as the first cellular SH2 ligand recruiting the complex to adhesions.","evidence":"GST pulldowns, co-IP, mutagenesis (R743A, RPLPSPP, Y789F), and PTPα-null cell reconstitution with co-localization","pmids":["22711540","22801373"],"confidence":"High","gaps":["Whether additional SH2 ligands operate in other contexts unknown","Stoichiometry of the PTPα–BCAR3–Cas–Src assembly unresolved"]},{"year":2013,"claim":"Established BCAR3 as a positive regulator of cytoskeletal remodeling by setting the Rac1/RhoA balance toward protrusion and adhesion disassembly in invasive cells.","evidence":"siRNA, Rac1/RhoA activity assays, MLC phosphorylation, and ROCK inhibition with focal adhesion imaging","pmids":["23762409"],"confidence":"High","gaps":["Direct GEF/GAP intermediaries controlling the balance not defined","In vivo invasion relevance not tested here"]},{"year":2013,"claim":"Extended BCAR3's mitogenic role to insulin signaling, showing SH2-dependent ERK activation and DNA synthesis with selectivity over IGF-1 and over GLUT4 translocation.","evidence":"Microinjection loss-of-function with ERK, DNA synthesis, ruffling, and GLUT4 assays in MCF-12A cells","pmids":["24216110"],"confidence":"Medium","gaps":["Single-lab microinjection methodology","Receptor phosphosite engaged by SH2 not mapped"]},{"year":2014,"claim":"Identified ERK1/2 as a key effector downstream of the BCAR1–BCAR3 complex required for antiestrogen resistance, refining the resistance mechanism.","evidence":"Structure-based interaction mutants, co-IP, ERK pathway analysis, and PEA15-mediated inhibition with resistance assays in MCF7 cells","pmids":["24584939"],"confidence":"High","gaps":["How the complex links to ERK activation mechanistically unresolved","Reconciliation with Cas-independent resistance (idx 12) not addressed"]},{"year":2021,"claim":"Integrated BCAR3 and Cas into a co-regulatory positive-feedback circuit and revealed Tyr117-gated proteasomal degradation as a negative-feedback brake, providing a unified dynamic model at adhesions.","evidence":"Live-cell imaging, FRAP, Y117 and SH2 mutagenesis, proteasome inhibition, and Cas-knockout cells","pmids":["34169835"],"confidence":"High","gaps":["Kinase phosphorylating Tyr117 not identified","E3 ligase mediating degradation unknown"]},{"year":2026,"claim":"Broadened BCAR3's pathological roles into fibrosis and additional cancers via TGF-β/SMAD and PI3K/AKT/mTOR programs, indicating context-dependent signaling beyond the Cas/Src axis.","evidence":"siRNA/shRNA knockdown, in vivo fibrosis and tumor models, pathway Western blots, and pharmacological rescue across macrophage, fibroblast, HNSCC, TNBC/MET, and thyroid systems","pmids":["38414524","40935299","34765292","41595187"],"confidence":"Medium","gaps":["Whether these effects use the Cas/GEF machinery or distinct adaptors unclear","Direct molecular link between BCAR3 and SMAD phosphorylation not established","Single-lab studies per disease context"]},{"year":null,"claim":"How BCAR3 intrinsic GEF activity is biochemically activated and regulated by Cas-family allostery, and which kinase/E3 ligase pair controls its Tyr117-dependent turnover, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No in vitro reconstitution of regulated GEF activity","Tyr117 kinase and degradation E3 ligase unidentified","Mechanistic basis for context-specific TGF-β/SMAD coupling unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,13,14,18]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,8,16]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,13]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[14,18]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[4,15]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[9,14,16]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix 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Specifically involved in INS/insulin signaling pathway by mediating MAPK1/ERK2-MAPK3/ERK1 activation and DNA synthesis (PubMed:24216110). Promotes insulin-mediated membrane ruffling (By similarity). In response to vasoconstrictor peptide EDN1, involved in the activation of RAP1 downstream of PTK2B via interaction with phosphorylated BCAR1 (PubMed:19086031). Inhibits cell migration and invasion via regulation of TGFB-mediated matrix digestion, actin filament rearrangement, and inhibition of invadopodia activity (By similarity). May inhibit TGFB-SMAD signaling, via facilitating BCAR1 and SMAD2 and/or SMAD3 interaction (By similarity). Regulates EGF-induced DNA synthesis (PubMed:18722344). Required for the maintenance of ocular lens morphology and structural integrity, potentially via regulation of focal adhesion complex signaling (By similarity). Acts upstream of PTPRA to regulate the localization of BCAR1 and PTPRA to focal adhesions, via regulation of SRC-mediated phosphorylation of PTPRA (By similarity). Positively regulates integrin-induced tyrosine phosphorylation of BCAR1 (By similarity). Acts as a guanine nucleotide exchange factor (GEF) for small GTPases RALA, RAP1A and RRAS (By similarity). However, in a contrasting study, lacks GEF activity towards RAP1 (PubMed:22081014)","subcellular_location":"Cytoplasm; Cell junction, focal adhesion","url":"https://www.uniprot.org/uniprotkb/O75815/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BCAR3","classification":"Not Classified","n_dependent_lines":32,"n_total_lines":1208,"dependency_fraction":0.026490066225165563},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"BCAR1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/BCAR3","total_profiled":1310},"omim":[{"mim_id":"604704","title":"BCAR3 ADAPTOR PROTEIN, NSP FAMILY MEMBER; BCAR3","url":"https://www.omim.org/entry/604704"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma 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all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/BCAR3"},"hgnc":{"alias_symbol":["NSP2","SH2D3B","AND-34","MIG7"],"prev_symbol":[]},"alphafold":{"accession":"O75815","domains":[{"cath_id":"3.30.505.10","chopping":"141-265","consensus_level":"high","plddt":85.9048,"start":141,"end":265},{"cath_id":"1.10.840.10","chopping":"535-816","consensus_level":"high","plddt":91.6735,"start":535,"end":816}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O75815","model_url":"https://alphafold.ebi.ac.uk/files/AF-O75815-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O75815-F1-predicted_aligned_error_v6.png","plddt_mean":65.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BCAR3","jax_strain_url":"https://www.jax.org/strain/search?query=BCAR3"},"sequence":{"accession":"O75815","fasta_url":"https://rest.uniprot.org/uniprotkb/O75815.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O75815/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O75815"}},"corpus_meta":[{"pmid":"15795078","id":"PMC_15795078","title":"Biochemical 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kinetics","url":"https://pubmed.ncbi.nlm.nih.gov/922802","citation_count":3,"is_preprint":false},{"pmid":"21654156","id":"PMC_21654156","title":"Bcar3 is expressed in sertoli cells and germ cells of the developing testis in mice.","date":"2011","source":"Sexual development : genetics, molecular biology, evolution, endocrinology, embryology, and pathology of sex determination and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/21654156","citation_count":2,"is_preprint":false},{"pmid":"27181359","id":"PMC_27181359","title":"Production, characterization, and in vitro effects of a novel monoclonal antibody against Mig-7.","date":"2016","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/27181359","citation_count":2,"is_preprint":false},{"pmid":"31140421","id":"PMC_31140421","title":"[Mig-7 gene silencing inhibits vasculogenic mimicry formation and invasion of glioma U251 cells in vitro by suppressing MEK/ERK signaling].","date":"2019","source":"Nan fang yi ke da xue xue bao = Journal of Southern Medical University","url":"https://pubmed.ncbi.nlm.nih.gov/31140421","citation_count":2,"is_preprint":false},{"pmid":"35485699","id":"PMC_35485699","title":"Association between Genetic Polymorphisms in MicroRNAs 196a2 (rs11614913) and 34 b/c (rs4938723) and Risk of Hepatocellular Carcinoma in Egyptian Patients.","date":"2022","source":"Asian Pacific journal of cancer prevention : APJCP","url":"https://pubmed.ncbi.nlm.nih.gov/35485699","citation_count":1,"is_preprint":false},{"pmid":"23127401","id":"PMC_23127401","title":"[Mig-7 enhances vasculogenic mimicry in gastric cancer cells].","date":"2012","source":"Xi bao yu fen zi mian yi xue za zhi = Chinese journal of cellular and molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/23127401","citation_count":1,"is_preprint":false},{"pmid":"27881337","id":"PMC_27881337","title":"[Inhibitory effect of Mig-7 silencing by retrovirus-mediated shRNA on vasculogenic mimicry, invasion and metastasis of human hepatocellular carcinoma cells in vitro].","date":"2016","source":"Nan fang yi ke da xue xue bao = Journal of Southern Medical University","url":"https://pubmed.ncbi.nlm.nih.gov/27881337","citation_count":1,"is_preprint":false},{"pmid":"40935299","id":"PMC_40935299","title":"BCAR3 confers resistance to cisplatin in head and neck squamous cell carcinoma by sustaining TGF-β/SMAD signaling.","date":"2025","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/40935299","citation_count":0,"is_preprint":false},{"pmid":"28616909","id":"PMC_28616909","title":"[MIG7 Regulates the Vasculogenic Mimicry Formation in Hepatocellular Carcinoma then Effects the Metastasis Potential of HCC].","date":"2017","source":"Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition","url":"https://pubmed.ncbi.nlm.nih.gov/28616909","citation_count":0,"is_preprint":false},{"pmid":"41888758","id":"PMC_41888758","title":"Trefoil factor family 3 (TFF3) and migration inducting gene 7 (MIG7) as molecular markers for early detection of endometrial carcinoma micro metastases.","date":"2026","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/41888758","citation_count":0,"is_preprint":false},{"pmid":"41251743","id":"PMC_41251743","title":"A cellular epithelioid hemangioma of the liver harboring a novel FOS::BCAR3 fusion gene.","date":"2025","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/41251743","citation_count":0,"is_preprint":false},{"pmid":"41595187","id":"PMC_41595187","title":"BCAR3 Hypomethylation as a Potential Diagnostic Marker for Thyroid Cancer and Its Mechanism via Promoting EMT and AKT/mTOR Pathway.","date":"2026","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/41595187","citation_count":0,"is_preprint":false},{"pmid":"42169367","id":"PMC_42169367","title":"RETRACTION: PEDF and 34-mer Peptide Inhibit Cardiac Microvascular Endothelial Cell Ferroptosis via Nrf2/HO-1 Signalling in Myocardial Ischemia-Reperfusion Injury.","date":"2026","source":"Journal of cellular and molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/42169367","citation_count":0,"is_preprint":false},{"pmid":"6118051","id":"PMC_6118051","title":"Reproduction of attenuated mumps virus in dog kidney cell cultures precultivated at 37 and 34 degrees C.","date":"1981","source":"Acta virologica","url":"https://pubmed.ncbi.nlm.nih.gov/6118051","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.03.24.644862","title":"Genome-wide association studies reveal novel loci associated with carcass and body measures in goats (  <i>Capra hircus</i>  )","date":"2025-03-25","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.24.644862","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":41244,"output_tokens":7226,"usd":0.116061,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16342,"output_tokens":5582,"usd":0.11063,"stage2_stop_reason":"end_turn"},"total_usd":0.226691,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"BCAR3 was identified as a novel SH2 domain-containing protein; retrovirus-mediated insertional mutagenesis revealed that transfer of the BCAR3 locus by cell fusion or transfection of BCAR3 cDNA into ZR-75-1 and MCF-7 breast cancer cells induces antiestrogen (tamoxifen) resistance.\",\n      \"method\": \"Retrovirus-mediated insertional mutagenesis, cell fusion, cDNA transfection\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — foundational gain-of-function experiment replicated across two cell lines using two orthogonal approaches (cell fusion and cDNA transfection)\",\n      \"pmids\": [\"9582273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"AND-34/BCAR3 contains an N-terminal SH2 domain and a C-terminal GDP-exchange factor (GEF)-like domain; it undergoes tyrosine phosphorylation upon serum stimulation or cell adhesion to fibronectin/poly-L-lysine, and co-precipitates with the focal adhesion protein p130Cas (as well as 95- and 125-kDa tyrosine-phosphorylated proteins) in NIH3T3 fibroblasts.\",\n      \"method\": \"Co-immunoprecipitation, tyrosine phosphorylation assay, sequence analysis, Western blotting\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, co-IP plus phosphorylation assay, consistent with later work\",\n      \"pmids\": [\"10438950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"AND-34/BCAR3 displays GEF activity on RalA, Rap1A, and R-Ras (but not Ha-Ras) GTPases in cells. Efficient binding of AND-34 to p130Cas requires both the Src-binding domain and a flanking C-terminal region of p130Cas. The AND-34 GEF domain contains the p130Cas-binding site. Overexpression of p130Cas (but not a mutant unable to bind AND-34) inhibits AND-34's Ral GEF activity, indicating p130Cas negatively regulates AND-34 GEF function.\",\n      \"method\": \"GEF activity assay in cells (RalA/Rap1A/R-Ras activation), co-immunoprecipitation with binding-domain mutants, overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — GEF activity demonstrated in cells, binding-domain mapping with mutants, multiple GTPase substrates tested, consistent with structural studies\",\n      \"pmids\": [\"10896938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"AND-34/BCAR3 overexpression activates Rho-family GTPases Cdc42 and Rac in epithelial cells; BCAR3 overexpression induces F-actin redistribution, augments PAK1 autophosphorylation and kinase activity, and activates the cyclin D1 promoter (proximal 163 bp) via a Rac1- and PAK1-dependent pathway, conferring antiestrogen resistance.\",\n      \"method\": \"GTPase activation assays, F-actin staining, PAK1 kinase assay, cyclin D1 promoter-luciferase reporter, dominant-negative Rac1/PAK1, stable transfection\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays (GTPase, kinase, reporter, dominant-negatives) in single rigorous study\",\n      \"pmids\": [\"14583477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"AND-34/BCAR3 functions synergistically with p130Cas to enhance c-Src kinase activity and promote cell migration; the C-terminal GEF domain of AND-34 and activity of its target Rap1 contribute to these events. AND-34 overexpression redistributes p130Cas from focal adhesions to lamellipodia at the leading edge.\",\n      \"method\": \"Co-immunoprecipitation, Src kinase assay, cell migration assay, immunofluorescence localization, Rap1 activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (kinase assay, migration, localization, GTPase), mechanistic follow-through with domain mutants\",\n      \"pmids\": [\"12740391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"AND-34/BCAR3 is expressed in splenic B cells and associates with both p130Cas and HEF1 via its GEF domain binding to the HEF1 C-terminus. Overexpression in B cell lines specifically activates Cdc42 (but not Rac, Rho, RalA, or Rap1), induces PAK1 activation, and inhibits SDF-1α-induced B cell polarization.\",\n      \"method\": \"Co-immunoprecipitation, GTPase activation assays, PAK1 kinase assay, morphology (actin staining), functional polarization assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, multiple GTPase assays, functional polarization readout; single lab\",\n      \"pmids\": [\"12517963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Both the GEF-like domain and the SH2 domain of AND-34/BCAR3 are required for Rac activation and for conferring resistance to the ER antagonist ICI 182,780. BCAR3 overexpression increases PI3K activity and augments Akt Ser473 phosphorylation/kinase activity; PI3K inhibition (LY294002 or dominant-negative p85) blocks BCAR3-mediated Rac and Akt activation. BCAR3-induced antiestrogen resistance is ER-alpha-independent. Rac inhibitor NSC23766 abrogates resistance.\",\n      \"method\": \"Domain-deletion/mutation analysis, PI3K activity assay, Akt phosphorylation/kinase assay, Rac activation assay, pharmacological inhibition, stable transfection\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal assays (PI3K, Akt, Rac), domain mutants, pharmacological inhibitors, single rigorous study\",\n      \"pmids\": [\"15671247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Structural analysis (SAXS) revealed that the NSP-binding domain of HEF1 forms a four-helix bundle, and the Cas-binding domain of BCAR3 adopts a Cdc25-like GEF fold. HEF1 binds very tightly to a site on BCAR3 that is remote from the putative GTPase-binding site of the GEF domain but analogous to an allosteric regulatory site in SOS, suggesting that Cas family binding may allosterically modulate BCAR3 GEF activity.\",\n      \"method\": \"Small-angle X-ray scattering (SAXS), structural modeling, binding analysis\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — SAXS structural data; allosteric modulation is proposed from structure without direct in vitro reconstitution of GEF activity change\",\n      \"pmids\": [\"19103205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"BCAR3 regulates c-Src kinase activity and the Src-p130Cas interaction in endogenous breast cancer cells. Using gain- and loss-of-function approaches, BCAR3 was shown to control both the quantity and quality of the Src-Cas association, and the coordinated activity of BCAR3/Cas/Src contributes to breast cancer cell adhesion signaling and spreading.\",\n      \"method\": \"Gain- and loss-of-function (overexpression and siRNA knockdown), co-immunoprecipitation, Src kinase assay, cell adhesion/spreading assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — endogenous setting, reciprocal gain/loss-of-function, multiple orthogonal readouts (kinase assay, co-IP, functional adhesion)\",\n      \"pmids\": [\"19940159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Pyk2 activation by endothelin-1 in glomerular mesangial cells leads to p130Cas phosphorylation and enhanced p130Cas-BCAR3 complex formation; BCAR3 then activates Rap1 (but not RhoA or Ras). siRNA knockdown of BCAR3 significantly decreases ET-1-induced Rap1 activation, placing BCAR3 downstream of Pyk2/p130Cas and upstream of Rap1 in this signaling axis.\",\n      \"method\": \"siRNA knockdown, dominant-interfering Pyk2 (CRNK), GTP-loading (Rap1, RhoA) assay, co-immunoprecipitation, adenovirus-mediated gene transfer\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis established by dominant-negative + siRNA, multiple downstream GTPases tested, two orthogonal loss-of-function approaches\",\n      \"pmids\": [\"19086031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"BCAR3 overexpression in breast cancer cells induces adhesion-dependent serine phosphorylation of p130Cas (at Ser139, Ser437, Ser639 identified by mass spectrometry). BCAR3 knockdown abolishes this phosphorylation, alters p130Cas localization, and converts MDA-231 growth to a cohesive epithelioid pattern lacking cellular projections. The BCAR3 serine/proline-rich domain is necessary for this p130Cas serine phosphorylation.\",\n      \"method\": \"Mass spectrometry phospho-site identification, phospho-amino acid analysis, inducible shRNA knockdown, immunofluorescence, domain-swap chimeras\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mass spectrometry site identification combined with domain-swap and loss-of-function experiments; multiple orthogonal methods\",\n      \"pmids\": [\"19454314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Loss of AND-34/BCAR3 in knockout mice causes posterior lens rupture beginning at ~3 weeks of age. Akt Ser473 phosphorylation and basal p130Cas phosphorylation are markedly reduced in BCAR3-null lens epithelial cells, demonstrating that BCAR3 is required for Akt and focal adhesion signaling in lens epithelium to maintain structural integrity.\",\n      \"method\": \"Homologous recombination knockout mice, histopathology, Western blotting (Akt phosphorylation, p130Cas phosphorylation), in situ hybridization\",\n      \"journal\": \"Molecular vision\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with specific molecular (Akt, p130Cas phosphorylation) and phenotypic (lens rupture) readouts\",\n      \"pmids\": [\"19365570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Using the p130Cas-binding point mutant R743A BCAR3, BCAR3-p130Cas complex formation was shown to be dispensable for BCAR3-mediated antiestrogen resistance, Rac activation, and epithelial cell discohesion, but required for optimal cell motility. While BCAR3 can signal independently of p130Cas for most functions, complex formation with other CAS family members (not p130Cas per se) is required for lamellipodia formation and motility in p130Cas-null MEFs.\",\n      \"method\": \"Point-mutant (R743A) overexpression, p130Cas-null MEFs, Rac activation assay, cell motility assay, lamellipodia formation assay, antiestrogen resistance assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — structure-function dissection with point mutant, multiple endpoints, genetic KO cells used for epistasis\",\n      \"pmids\": [\"21262352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"BCAR3 augments the binding of the c-Src SH3 domain to p130Cas via an RPLPSPP motif in the p130Cas Src-binding domain (SBD), in a manner dependent on the BCAR3-p130Cas complex. BCAR3-induced tyrosine phosphorylation of the p130Cas substrate domain (Src-dependent) is reduced by the R743A mutation blocking BCAR3-p130Cas association. Immunofluorescence shows BCAR3 co-localizes with p130Cas and Src.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation, site-directed mutagenesis (R743A BCAR3, RPLPSPP motif), immunofluorescence co-localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — GST pulldown + co-IP + mutagenesis + localization, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"22711540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PTPα phospho-Tyr789 serves as the first identified cellular ligand for the BCAR3 SH2 domain, recruiting the BCAR3-Cas complex to integrin-mediated focal adhesions. In PTPα-null cells, reconstitution with wild-type PTPα (but not Y789F mutant) restores PTPα and Cas localization to adhesions and Src-mediated Cas phosphorylation, defining a PTPα→BCAR3→Cas→Src signaling axis at adhesions.\",\n      \"method\": \"PTPα-null cell reconstitution, SH2 domain binding assay, immunofluorescence/co-localization, phospho-specific antibodies, mutagenesis (Y789F)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — null cell reconstitution with point mutant, identifies first cellular SH2 ligand for BCAR3, multiple orthogonal experiments\",\n      \"pmids\": [\"22801373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In invasive breast cancer cells, BCAR3 is necessary for membrane protrusiveness, Rac1 activity, and adhesion disassembly. BCAR3 depletion shifts the Rac1/RhoA balance toward RhoA, leading to increased ROCK-mediated myosin light chain II phosphorylation and formation of large ROCK/mDia1-dependent focal adhesions, establishing BCAR3 as a positive regulator of cytoskeletal remodeling through Rac1/RhoA balance.\",\n      \"method\": \"siRNA knockdown (loss-of-function), Rac1 and RhoA activity assays, myosin light chain phosphorylation measurement, ROCK inhibitor, focal adhesion analysis by immunofluorescence\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean loss-of-function with multiple orthogonal molecular and cellular readouts, pharmacological validation\",\n      \"pmids\": [\"23762409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"BCAR3-induced antiestrogen resistance in MCF7 cells critically depends on its physical interaction with BCAR1/p130CAS (shown using structure-based interaction mutants). BCAR3 binding to BCAR1 increases phospho-BCAR1 levels. BCAR1/BCAR3 co-overexpression correlates with increased ERK1/2 activity, and inhibition of ERK1/2 via PEA15 overexpression negates resistance, revealing ERK1/2 as a key effector downstream of the BCAR1-BCAR3 complex.\",\n      \"method\": \"Structure-based interaction mutants, co-immunoprecipitation, phosphoprotein detection, ERK1/2 kinase pathway analysis, PEA15 overexpression, antiestrogen resistance assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — structure-guided mutagenesis, multiple downstream pathway readouts, ERK1/2 epistasis established with functional rescue/inhibition\",\n      \"pmids\": [\"24584939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"BCAR3 SH2 domain directly associates with activated EGF receptor and Cas in MCF-12A cells; microinjection of anti-BCAR3 antibody or BCAR3 siRNA inhibits EGF-induced DNA synthesis, and overexpression of BCAR3 alone induces DNA synthesis, placing BCAR3 as a positive mediator of EGF mitogenic signaling and cell cycle progression.\",\n      \"method\": \"Co-immunoprecipitation, microinjection of antibody/siRNA/expression plasmid, DNA synthesis assay ([3H]thymidine incorporation)\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — microinjection loss/gain-of-function plus co-IP; single lab, single study\",\n      \"pmids\": [\"18722344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"BCAR3 localizes to integrin adhesions in a Cas-dependent manner; in return, Cas phosphorylation, lamellipodia dynamics, and cell migration require the BCAR3 SH2 domain and BCAR3 Tyr117 phosphorylation. Tyr117 phosphorylation also targets BCAR3 for degradation by the ubiquitin-proteasome system, creating a regulatory negative-feedback loop. This places BCAR3 and Cas in a co-regulatory positive-feedback circuit at adhesions.\",\n      \"method\": \"Live-cell imaging, FRAP, phospho-site mutagenesis (Y117), proteasome inhibitor experiments, Cas knockout cells, site-directed mutagenesis of SH2 domain\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — phospho-site mutagenesis, genetic KO cells, live imaging, proteasome pathway characterization, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"34169835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BCAR3 mediates ERK activation and DNA synthesis in response to insulin (but not IGF-1) in MCF-12A cells via its SH2 domain; BCAR3 inhibition suppresses insulin-induced membrane ruffling but not GLUT4 translocation, defining a specific role for BCAR3 in insulin-stimulated cell cycle progression and cytoskeletal reorganization.\",\n      \"method\": \"Microinjection of inhibitory antibody/siRNA, ERK activation assay, DNA synthesis assay, GLUT4 translocation assay, SH2 domain blocking\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — microinjection loss-of-function with multiple specific readouts; single lab\",\n      \"pmids\": [\"24216110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BCAR3 expression in macrophages is regulated by Stat6, while in fibroblasts it is regulated by TGFβR1/Smad3. BCAR3 amplifies the IL-4/Stat6 pathway in macrophages and the TGF-β/Smad3 pathway in fibroblasts, supporting a synergistic macrophage-fibroblast crosstalk loop that drives pulmonary fibrosis. siRNA-mediated silencing of Bcar3 protects mice from fibrosis in two models.\",\n      \"method\": \"siRNA knockdown, Stat6/Smad3 pathway analysis (Western blot), in vivo fibrosis models (bleomycin, FITC), human precision-cut lung slices, flow cytometry\",\n      \"journal\": \"International journal of nanomedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KD with two animal models and ex vivo human tissue; pathway signaling measured; single lab\",\n      \"pmids\": [\"38414524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BCAR3 promotes intrinsic cisplatin resistance in head and neck squamous cell carcinoma by sustaining TGF-β/SMAD signaling: BCAR3 increases phosphorylation of SMAD2 and facilitates transcriptional activation of SMAD4, suppressing mitochondria-derived apoptosis. Inhibition of TGF-β/SMAD signaling with galunisertib synergizes with cisplatin.\",\n      \"method\": \"Transcriptome analysis, Western blotting (pSMAD2, SMAD4), flow cytometry (apoptosis), BCAR3 knockdown in vitro and in vivo, pharmacological TGFβRI inhibition (galunisertib)\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function, molecular pathway readouts, pharmacological epistasis; single lab\",\n      \"pmids\": [\"40935299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A spontaneous 1-bp insertion in exon 7 of Bcar3 (producing a premature stop codon and truncated protein) in CF#1/lr mice causes autosomal recessive lens extrusion cataracts, independently confirming that BCAR3 loss disrupts lens integrity in vivo (consistent with the AND-34 knockout model).\",\n      \"method\": \"Whole-genome mapping, Sanger sequencing, histopathology, genetic complementation analysis\",\n      \"journal\": \"Mammalian genome\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — independent spontaneous mouse mutant confirms KO lens phenotype; sequencing confirms loss-of-function allele\",\n      \"pmids\": [\"27364350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CrkII associates with BCAR3 in human glomerular mesangial cells; ET-1 treatment time-dependently increases CrkII-BCAR3 complex formation, and this association is Pyk2-dependent (dominant-interfering Pyk2 reduces CrkII-BCAR3 association), placing BCAR3 downstream of Pyk2 and upstream of CrkII in ET-1 signaling.\",\n      \"method\": \"Co-immunoprecipitation, adenovirus-mediated dominant-interfering Pyk2 expression, ET-1 stimulation time-course\",\n      \"journal\": \"Experimental biology and medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP experiment, single lab, no in vitro reconstitution\",\n      \"pmids\": [\"16740993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"BCAR3 participates in a pathway with the MET receptor to control proliferation and migration of triple-negative breast cancer cells; BCAR3 knockdown reduces tumor growth in orthotopic mouse models. In some TNBC backgrounds, BCAR3 activates an autocrine HGF loop to sustain MET signaling.\",\n      \"method\": \"siRNA/shRNA knockdown, orthotopic mouse tumor models, RNA expression database correlation, HGF/MET signaling assays, proliferation and migration assays\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function combined with pathway analysis; single lab; autocrine loop supported by expression data\",\n      \"pmids\": [\"34765292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"BCAR3 knockdown in thyroid cancer cells reduces AKT/mTOR phosphorylation and shifts EMT markers (increases E-cadherin, decreases vimentin and N-cadherin), suppressing proliferation, migration, and invasion; partial rescue with a PI3K activator supports BCAR3 acting upstream of PI3K/AKT/mTOR to promote EMT and invasive behavior.\",\n      \"method\": \"shRNA knockdown, Western blot (AKT/mTOR phosphorylation, EMT markers), proliferation/migration/invasion assays, PI3K activator rescue experiment\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with molecular and functional readouts, pharmacological rescue; single lab, incomplete rescue in PI3K rescue experiment\",\n      \"pmids\": [\"41595187\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BCAR3 is a cytoplasmic adaptor/scaffold protein containing an N-terminal SH2 domain (which binds phospho-Tyr789 of PTPα and activated EGF/insulin receptors) and a C-terminal Cdc25-like GEF domain (which binds p130Cas/BCAR1 and HEF1/NEDD9 and exhibits GEF activity toward Ral, Rap1, and R-Ras GTPases); it forms a co-regulatory positive-feedback circuit with p130Cas at integrin adhesions—where Cas recruits BCAR3 and BCAR3 in return promotes Cas phosphorylation, Rac1 activation, and lamellipodia dynamics—while also amplifying c-Src kinase activity, activating a PI3K→Rac1→PAK1→cyclin D1 axis, and engaging ERK1/2 downstream of the BCAR1/BCAR3 complex to confer antiestrogen resistance in breast cancer cells, with BCAR3 activity regulated by ubiquitin-proteasome-mediated degradation gated on Tyr117 phosphorylation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BCAR3 (AND-34) is a cytoplasmic SH2- and Cdc25-like GEF-domain adaptor that couples integrin and growth-factor signaling to Rho-family GTPase activation and cytoskeletal remodeling, and was originally isolated as a gain-of-function inducer of antiestrogen (tamoxifen) resistance in breast cancer cells [#0, #6]. Its C-terminal GEF domain binds the focal adhesion proteins p130Cas/BCAR1 and HEF1/NEDD9 and exhibits exchange activity toward RalA, Rap1A, and R-Ras, while p130Cas binding to the GEF domain negatively regulates this activity [#1, #2, #5]; structural analysis places the Cas-family binding site at a position analogous to the allosteric regulatory site of SOS [#7]. Functionally, BCAR3 forms a co-regulatory positive-feedback circuit with Cas at integrin adhesions—Cas recruits BCAR3, and BCAR3 in turn promotes Cas tyrosine and serine phosphorylation, augments the c-Src SH3 interaction with Cas, and drives Rac1 activation, lamellipodia dynamics, and adhesion turnover, with its own activity gated by Tyr117 phosphorylation that targets it for ubiquitin-proteasome degradation [#8, #10, #13, #18]. BCAR3 sets the Rac1/RhoA balance toward protrusive, migratory behavior [#15], and its SH2 domain binds PTPα phospho-Tyr789 to localize the BCAR3–Cas complex to adhesions and direct Src-mediated Cas phosphorylation [#14]. Downstream, BCAR3 engages a PI3K→Rac1→PAK1→cyclin D1 axis and ERK1/2 to confer ER-independent antiestrogen resistance, the latter dependent on its physical interaction with BCAR1 [#3, #6, #16]. Genetic loss of BCAR3 in mice causes posterior lens rupture/extrusion cataracts with reduced Akt and Cas phosphorylation, establishing a requirement for BCAR3 in focal adhesion signaling that maintains lens epithelial integrity [#11, #22]. Beyond these roles, BCAR3 mediates EGF- and insulin-stimulated cell cycle progression [#17, #19] and has been implicated in TGF-β/SMAD- and PI3K/AKT-driven programs underlying fibrosis and therapy resistance in several cancers [#20, #21, #24, #25].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established BCAR3 as a causal driver of antiestrogen resistance, answering whether a single locus could confer tamoxifen escape in breast cancer cells.\",\n      \"evidence\": \"Retrovirus-mediated insertional mutagenesis with cell fusion and cDNA transfection in ZR-75-1 and MCF-7 cells\",\n      \"pmids\": [\"9582273\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No mechanism or domain function defined at this stage\", \"No endogenous partners identified\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined the modular architecture (N-terminal SH2, C-terminal GEF-like domain) and first linked BCAR3 to adhesion signaling via p130Cas, addressing how the protein might transduce signals.\",\n      \"evidence\": \"Sequence analysis, co-IP, and tyrosine phosphorylation assays in NIH3T3 fibroblasts\",\n      \"pmids\": [\"10438950\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GEF substrates untested\", \"Functional consequence of Cas binding unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrated BCAR3 GEF activity toward RalA, Rap1A, and R-Ras and mapped p130Cas binding to the GEF domain, while showing Cas negatively regulates exchange activity—revealing a built-in regulatory logic.\",\n      \"evidence\": \"Cellular GEF activation assays and binding-domain mutant co-IPs with overexpression\",\n      \"pmids\": [\"10896938\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vitro reconstitution of intrinsic exchange activity\", \"Physiological GTPase target context not resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Connected BCAR3 to Rho-family (Cdc42/Rac) activation, PAK1, and cyclin D1 transcription, and showed synergy with p130Cas in Src activation and migration—mechanistically explaining its proliferative and motility effects.\",\n      \"evidence\": \"GTPase and PAK1 kinase assays, cyclin D1 reporter with dominant-negatives, Src kinase and migration assays in epithelial cells\",\n      \"pmids\": [\"14583477\", \"12740391\", \"12517963\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type-specific GTPase selectivity not reconciled\", \"Direct vs indirect GEF action on Rac/Cdc42 unresolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed both SH2 and GEF domains are required for Rac activation and resistance, and placed PI3K→Akt upstream of Rac in an ER-independent resistance pathway.\",\n      \"evidence\": \"Domain mutants, PI3K/Akt assays, Rac assays, and pharmacological inhibition (LY294002, NSC23766) in stable transfectants\",\n      \"pmids\": [\"15671247\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SH2 and GEF domains cooperate mechanistically not defined\", \"Direct PI3K-activating event not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Provided structural insight that the Cas-binding site lies at a SOS-like allosteric position, framing how Cas-family binding could modulate GEF output.\",\n      \"evidence\": \"SAXS and structural modeling of the BCAR3 GEF and HEF1 binding domains\",\n      \"pmids\": [\"19103205\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Allosteric modulation not confirmed by in vitro GEF reconstitution\", \"No high-resolution complex structure\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linked the BCAR3 SH2 domain to activated EGFR and showed BCAR3 is required for EGF-induced DNA synthesis, extending its role to growth-factor mitogenic signaling.\",\n      \"evidence\": \"Co-IP and microinjection of antibody/siRNA/plasmid with thymidine incorporation in MCF-12A cells\",\n      \"pmids\": [\"18722344\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab microinjection approach\", \"Direct EGFR phosphosite for SH2 binding not mapped\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established BCAR3 control over the Src–Cas association in endogenous cells and identified BCAR3-driven adhesion-dependent serine phosphorylation of specific p130Cas sites, defining how BCAR3 shapes Cas signaling quality.\",\n      \"evidence\": \"Gain/loss-of-function, Src kinase and adhesion assays, and mass-spectrometry phosphosite mapping with domain-swap chimeras in breast cancer cells\",\n      \"pmids\": [\"19940159\", \"19454314\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for Cas serine phosphorylation not identified\", \"Functional consequence of each phosphosite unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed BCAR3 in a defined Pyk2/p130Cas→BCAR3→Rap1 axis downstream of endothelin-1 in mesangial cells, providing receptor-level epistasis.\",\n      \"evidence\": \"siRNA, dominant-interfering Pyk2, GTP-loading assays, and co-IP in glomerular mesangial cells\",\n      \"pmids\": [\"19086031\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue specificity of Rap1 selectivity not generalized\", \"Downstream effectors of Rap1 here undefined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined an in vivo requirement for BCAR3 in lens epithelial integrity through Akt and Cas signaling, moving beyond cell-line phenotypes.\",\n      \"evidence\": \"Knockout mice with histopathology and Western blotting of Akt and p130Cas phosphorylation\",\n      \"pmids\": [\"19365570\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-autonomous mechanism of lens rupture not fully dissected\", \"Other tissue phenotypes not surveyed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Dissected which functions require physical BCAR3–p130Cas complex formation, showing complex formation is dispensable for resistance/Rac but required for optimal motility and (via other Cas members) lamellipodia.\",\n      \"evidence\": \"R743A point mutant in p130Cas-null MEFs with Rac, motility, lamellipodia, and resistance assays\",\n      \"pmids\": [\"21262352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the alternative Cas-family partner driving motility not pinned down\", \"Cas-independent signaling route undefined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Explained mechanistically how BCAR3 enhances Src–Cas signaling, by augmenting c-Src SH3 binding to an RPLPSPP motif in the Cas SBD, and identified PTPα pTyr789 as the first cellular SH2 ligand recruiting the complex to adhesions.\",\n      \"evidence\": \"GST pulldowns, co-IP, mutagenesis (R743A, RPLPSPP, Y789F), and PTPα-null cell reconstitution with co-localization\",\n      \"pmids\": [\"22711540\", \"22801373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional SH2 ligands operate in other contexts unknown\", \"Stoichiometry of the PTPα–BCAR3–Cas–Src assembly unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established BCAR3 as a positive regulator of cytoskeletal remodeling by setting the Rac1/RhoA balance toward protrusion and adhesion disassembly in invasive cells.\",\n      \"evidence\": \"siRNA, Rac1/RhoA activity assays, MLC phosphorylation, and ROCK inhibition with focal adhesion imaging\",\n      \"pmids\": [\"23762409\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct GEF/GAP intermediaries controlling the balance not defined\", \"In vivo invasion relevance not tested here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended BCAR3's mitogenic role to insulin signaling, showing SH2-dependent ERK activation and DNA synthesis with selectivity over IGF-1 and over GLUT4 translocation.\",\n      \"evidence\": \"Microinjection loss-of-function with ERK, DNA synthesis, ruffling, and GLUT4 assays in MCF-12A cells\",\n      \"pmids\": [\"24216110\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab microinjection methodology\", \"Receptor phosphosite engaged by SH2 not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified ERK1/2 as a key effector downstream of the BCAR1–BCAR3 complex required for antiestrogen resistance, refining the resistance mechanism.\",\n      \"evidence\": \"Structure-based interaction mutants, co-IP, ERK pathway analysis, and PEA15-mediated inhibition with resistance assays in MCF7 cells\",\n      \"pmids\": [\"24584939\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the complex links to ERK activation mechanistically unresolved\", \"Reconciliation with Cas-independent resistance (idx 12) not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Integrated BCAR3 and Cas into a co-regulatory positive-feedback circuit and revealed Tyr117-gated proteasomal degradation as a negative-feedback brake, providing a unified dynamic model at adhesions.\",\n      \"evidence\": \"Live-cell imaging, FRAP, Y117 and SH2 mutagenesis, proteasome inhibition, and Cas-knockout cells\",\n      \"pmids\": [\"34169835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase phosphorylating Tyr117 not identified\", \"E3 ligase mediating degradation unknown\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Broadened BCAR3's pathological roles into fibrosis and additional cancers via TGF-β/SMAD and PI3K/AKT/mTOR programs, indicating context-dependent signaling beyond the Cas/Src axis.\",\n      \"evidence\": \"siRNA/shRNA knockdown, in vivo fibrosis and tumor models, pathway Western blots, and pharmacological rescue across macrophage, fibroblast, HNSCC, TNBC/MET, and thyroid systems\",\n      \"pmids\": [\"38414524\", \"40935299\", \"34765292\", \"41595187\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether these effects use the Cas/GEF machinery or distinct adaptors unclear\", \"Direct molecular link between BCAR3 and SMAD phosphorylation not established\", \"Single-lab studies per disease context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How BCAR3 intrinsic GEF activity is biochemically activated and regulated by Cas-family allostery, and which kinase/E3 ligase pair controls its Tyr117-dependent turnover, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro reconstitution of regulated GEF activity\", \"Tyr117 kinase and degradation E3 ligase unidentified\", \"Mechanistic basis for context-specific TGF-β/SMAD coupling unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005088\", \"supporting_discovery_ids\": [2, 5, 9]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 13, 14, 18]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 8, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 13]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [14, 18]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [4, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [9, 14, 16]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [14, 18, 15]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 16, 21]}\n    ],\n    \"complexes\": [\n      \"BCAR3-p130Cas/BCAR1 complex\",\n      \"BCAR3-HEF1/NEDD9 complex\",\n      \"PTPalpha-BCAR3-Cas-Src complex\"\n    ],\n    \"partners\": [\n      \"BCAR1\",\n      \"NEDD9\",\n      \"SRC\",\n      \"PTPRA\",\n      \"CRK\",\n      \"PTK2B\",\n      \"EGFR\",\n      \"MET\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}