{"gene":"SHC1","run_date":"2026-06-10T07:46:31","timeline":{"discoveries":[{"year":1994,"finding":"SHC1 (Shc) directly interacts with the autophosphorylated PDGF beta-receptor via its SH2 domain. Multiple autophosphorylation sites on the PDGF beta-receptor (Tyr-579, Tyr-740, Tyr-751, Tyr-771) mediate Shc SH2 domain binding. Receptor activation induces preferential phosphorylation of p52Shc, which then associates with Grb2.","method":"Co-immunoprecipitation, GST-SH2 domain pulldown with purified baculovirus-expressed receptor, synthetic peptide analysis, mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct binding demonstrated with purified proteins in vitro plus mutagenesis identifying specific binding sites","pmids":["8195171"],"is_preprint":false},{"year":1994,"finding":"Following EGF stimulation in rat liver, SHC is recruited to and tyrosine-phosphorylated by the EGF receptor (primarily at pTyr-1173), associates with GRB2 and mSOS largely in endosomes, forming a cytosolic complex that links to Ras activation (evidenced by Raf-1 mobility shift). Insulin receptor activation does not detectably phosphorylate SHC or recruit GRB2/mSOS in the same cells, demonstrating receptor-specific compartmentalization.","method":"In vivo receptor stimulation, subcellular fractionation, co-immunoprecipitation, Western blotting","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP with fractionation in vivo, replicated across multiple time points with clear controls","pmids":["7925272"],"is_preprint":false},{"year":1994,"finding":"Shc associates with the PEST tyrosine phosphatase (PTP-PEST) via its amino-terminal half (p52 and p66 but not p46 isoforms). Complex formation is stimulated 6–8-fold by PKC activator PMA but not by EGF or serum, linking G-protein receptor/PKC crosstalk to Shc regulation.","method":"Yeast two-hybrid screen, GST pulldown, co-immunoprecipitation from HeLa and neuroblastoma cells, isoform-specific analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus yeast 2-hybrid, single lab","pmids":["7929214"],"is_preprint":false},{"year":1995,"finding":"HGF receptor tyrosine phosphorylates ShcA via docking at pY1349 and pY1356 (Kd ~150 nM each via BIAcore); this leads to Shc phosphorylation at Y317, creating a high-affinity Grb2 binding site (Kd 15 nM), thereby amplifying Ras pathway activation. Overexpression of wild-type Shc but not Y317F mutant enhances HGF-induced cell migration and growth.","method":"Site-directed mutagenesis of HGF receptor, BIAcore biosensor binding assay, overexpression of wild-type vs. Y317F mutant Shc","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro binding assay with purified proteins + mutagenesis + functional readout, single lab","pmids":["7731718"],"is_preprint":false},{"year":1995,"finding":"Gbeta-gamma subunits of heterotrimeric G proteins stimulate tyrosine phosphorylation of the Shc p46/p52 isoforms, representing an early step in Gi-coupled receptor-mediated Ras/MAP kinase activation. Phosphorylation is blocked by a G-beta-gamma-binding PH domain peptide, tyrosine kinase inhibitors, and wortmannin (PI3K inhibitor), but not by dominant-negative Ras.","method":"Overexpression of G-beta-gamma or alpha2-adrenergic receptor in COS-7 cells, anti-phosphotyrosine immunoprecipitation, anti-Shc immunoprecipitation, pertussis toxin treatment, inhibitor studies","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with pharmacological dissection, single lab","pmids":["7568118"],"is_preprint":false},{"year":1995,"finding":"G protein-coupled chemoattractant (N-formyl peptide) receptor activates the Src-family kinase Lyn, which binds to Shc (via the Shc SH2 domain) and phosphorylates it on tyrosine. Phospho-Shc/phospho-Lyn complexes then associate with PI3K, correlating with PI3,4,5-P3 generation.","method":"Co-immunoprecipitation from human neutrophils, Western blot, SH2-domain binding studies","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP in primary human cells, single lab","pmids":["7650013"],"is_preprint":false},{"year":1995,"finding":"Growth hormone (GH) promotes rapid tyrosyl phosphorylation of all three ShcA isoforms (p66, p52, p46) through JAK2. The ShcA SH2 domain binds tyrosyl-phosphorylated JAK2 directly (shown with constitutively phosphorylated JAK2 in COS-7 cells). Grb2 subsequently associates with phosphorylated ShcA in a GH-dependent manner. GHR domains required for ShcA phosphorylation were mapped by mutagenesis.","method":"GST-SHC SH2 domain pulldown, co-immunoprecipitation, GHR mutagenesis in CHO cells, Western blotting","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro pulldown with purified proteins + receptor mutagenesis + co-IP, single lab","pmids":["7535773"],"is_preprint":false},{"year":1995,"finding":"MAP kinase phosphorylates the C-terminal tail of mSos1 in vitro at sites shared with EGF-stimulated cells, and this phosphorylation disrupts mSos1-Grb2 binding to Shc and the EGF receptor, providing a negative-feedback mechanism attenuating Ras activation downstream of Shc.","method":"In vitro MAP kinase phosphorylation of mSos1, tryptic phosphopeptide mapping, binding assays with phosphorylated vs. unphosphorylated mSos1","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified kinase + peptide mapping + binding assays, single lab","pmids":["7478566"],"is_preprint":false},{"year":1995,"finding":"Insulin receptor preferentially phosphorylates the p52 ShcA isoform (4-fold higher Vmax than p46 in vitro) and shows differential binding to p52 vs. p46 in vitro; EGF receptor phosphorylates both isoforms equivalently. Grb2 predominantly associates with p52ShcA after insulin stimulation.","method":"In vitro kinase assay with purified isoforms, co-immunoprecipitation, CHO cell overexpression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with purified proteins + in vivo co-IP, single lab","pmids":["7544794"],"is_preprint":false},{"year":1996,"finding":"Shc couples a class of integrins to cell cycle progression and MAP kinase activation. The recruitment of Shc by integrins is specified by the extracellular/transmembrane domain of specific integrin alpha subunits and is mediated by caveolin. Dominant-negative Shc and mutagenesis demonstrate Shc is necessary and sufficient for integrin-mediated MAP kinase activation and cooperation with mitogens to drive G1 transit.","method":"Co-immunoprecipitation, mutagenesis, dominant-negative inhibition, integrin alpha-subunit domain swaps","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — dominant-negative and mutagenesis + co-IP across multiple integrins, highly cited and replicated","pmids":["8929541"],"is_preprint":false},{"year":1996,"finding":"Shc interacts with alpha- and beta-adaptins (components of clathrin adaptor complexes involved in receptor endocytosis) via amino acids 346–355 in the collagen homologous (CH1) region. This interaction is phosphotyrosine-independent.","method":"GST-Shc affinity chromatography from bovine brain lysates, peptide sequencing, co-immunoprecipitation, domain-deletion GST-Shc mutants","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GST pulldown + co-IP + domain mapping, single lab","pmids":["8617812"],"is_preprint":false},{"year":1997,"finding":"Shc mediates IL-6 signaling by associating in vivo and in vitro with phosphorylated gp130 through the Shc SH2 domain and with activated Jak2 via the Shc PTB (phosphotyrosine-binding) domain. IL-6 stimulation induces Shc-Grb2 association, linking Jak2 to the Ras/MAP kinase pathway.","method":"Co-immunoprecipitation in vivo and in vitro, domain-specific binding assays","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro co-IP with domain specificity, single lab","pmids":["9126968"],"is_preprint":false},{"year":1997,"finding":"The Shc PTB domain binds Ret/ptc2 at Tyr586 (Tyr1062 of proto-Ret) with ~20-fold higher affinity than the Shc SH2 domain; a Y586F Ret/ptc2 mutant abolishes Shc docking. Both Shc PTB and SH2 domains interact with Ret/ptc2 in vitro.","method":"In vitro pulldown with Shc PTB and SH2 domains, site-directed mutagenesis (Y586F), co-immunoprecipitation","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro domain binding + mutagenesis establishing specific docking site, single lab","pmids":["9047384"],"is_preprint":false},{"year":1997,"finding":"ShcA interacts via its SH2 domain with the cytoplasmic domain of cadherin in a phosphotyrosine-dependent manner, demonstrated by yeast two-hybrid, co-precipitation from mammalian cells, and direct biochemical pulldown. EGF stimulation abrogates this association.","method":"Yeast two-hybrid, co-precipitation from A-431 cells, direct in vitro biochemical pulldown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — three independent methods including direct in vitro binding, single lab","pmids":["9153187"],"is_preprint":false},{"year":1998,"finding":"PyV middle T antigen-mediated mammary tumorigenesis requires both Shc and PI3K signaling: Shc-binding-site mutant MT failed to efficiently form metastatic mammary tumors in transgenic mice; metastatic tumors arising in these mice showed reversion of the Shc binding site, genetically confirming Shc's requirement for tumor progression.","method":"Transgenic mouse models with PyV MT mutants decoupled from Shc or PI3K, genetic and biochemical reversion analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic epistasis in transgenic models with biochemical reversion analysis, replicated across cohorts","pmids":["9528804"],"is_preprint":false},{"year":1998,"finding":"The Shc PTB domain interacts with Ret/ptc2 at Tyr586 and results in Shc tyrosine phosphorylation. Mitogenic signaling from Ret/ptc2 requires both Shc recruitment (via Y586) and subcellular localization via Enigma; Shc and Enigma bind the same Ret/ptc2 site on individual monomers, so dimerization enables assembly of both.","method":"Co-immunoprecipitation, chimeric receptor constructs, dominant-negative Ras/Raf epistasis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis plus co-IP with chimeric receptors, single lab","pmids":["9528800"],"is_preprint":false},{"year":1999,"finding":"Shc mediates random (non-directional) cell motility downstream of integrins via the MAP kinase pathway. PTEN directly dephosphorylates Shc, downregulating Shc-driven MAP kinase activation and migration. This Shc/MEK1 pathway is additive to a separate FAK/p130Cas pathway regulating directional migration.","method":"Overexpression of dominant-negative Shc, constitutively active MEK1, PTEN reconstitution, in vitro PTEN phosphatase assay on Shc, cell migration assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro phosphatase assay demonstrating PTEN acts on Shc + dominant-negative and overexpression functional assays, single lab","pmids":["10427092"],"is_preprint":false},{"year":1999,"finding":"ShcA associates with SHIP (SH2-containing inositol phosphatase) via the ShcA PTB domain following FLT3 activation. ShcA is phosphorylated at Tyr239/240 and Tyr313 by FLT3; Shc overexpression increases SHIP tyrosine phosphorylation (requiring functional PTB domain) and limits FLT3-dependent cell growth (requiring Tyr313).","method":"Co-immunoprecipitation, site-directed mutagenesis (Y→F substitutions), overexpression studies, cell growth assays","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP + mutagenesis defining phosphorylation sites and PTB-domain requirement, single lab","pmids":["10482988"],"is_preprint":false},{"year":1999,"finding":"The Shc SH2 domain binds the phosphorylated novel protein PAL (Protein expressed in Activated Lymphocytes) in a phosphotyrosine-independent manner, identifying a non-canonical interaction mode for the Shc SH2 domain. PAL expression is restricted to proliferating cells and is growth-factor inducible.","method":"Yeast two-hybrid, domain mapping with Shc mutants","journal":"Oncogene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single yeast two-hybrid result, no in-cell validation of phosphotyrosine-independent binding","pmids":["10086341"],"is_preprint":false},{"year":1999,"finding":"Shc differentially regulates cell migration vs. proliferation depending on growth factor availability: under growth-factor-limiting conditions the PTB domain drives haptotactic migration, whereas when growth factors are present the SH2 domain is selectively required for DNA synthesis.","method":"Mutational analysis of Shc PTB and SH2 domains, migration and proliferation assays under varied growth factor conditions","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific mutagenesis with two distinct functional readouts, single lab","pmids":["10613912"],"is_preprint":false},{"year":2000,"finding":"ShcA sensitizes cells to growth factor-induced MAP kinase activation and organizes cytoskeletal rearrangement in response to extracellular matrix. ShcA-null mouse embryos exhibit cardiovascular defects (heart development and blood vessel remodeling defects), with MAP kinase pathway selectively impaired. The PTB and SH2 domains of ShcA mediate these functions.","method":"Targeted mutation/knockout of ShcA in mice, biochemical analysis of mutant cells, MAPK activation assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic knockout with biochemical pathway analysis confirming mechanism","pmids":["10809671"],"is_preprint":false},{"year":2000,"finding":"Shc activates the PI3K/Akt pathway via a Shc→Grb2→Gab2→PI3K cascade downstream of cytokine receptors (IL-3 betac, IL-2Rbeta) that lack direct p85-binding sites. Y577 (Shc binding site on betac) is the major site required for Gab2 phosphorylation. Fusion of Shc directly to mutant IL-2Rbeta demonstrates Shc is sufficient to evoke Gab2 phosphorylation; mutation of the three Shc pYXN/Grb2-binding tyrosines abolishes this.","method":"Y→F mutant and 'add-back' receptor mutants, chimeric receptors, Grb2 SH2/SH3 dominant-negative mutants, Gab2 PI3K-binding mutants, Akt activation assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — chimeric receptor reconstitution + multiple epistatic mutants establishing pathway order","pmids":["10982827"],"is_preprint":false},{"year":2000,"finding":"Shc and FAK activate ERK independently and in parallel downstream of integrins. Cytochalasin D abolishes FAK but not Shc signaling to ERK. Targeted deletion of the beta1 cytoplasmic domain segment required for FAK activation does not impair Shc tyrosine phosphorylation or ERK activation. Dominant-negative studies show Shc mediates the early/peak phase and FAK/p130CAS/Crk/Rap1 mediate the late phase of ERK activation.","method":"Cytochalasin D treatment, targeted beta1 integrin cytoplasmic domain deletion in primary fibroblasts, dominant-negative constructs, ERK activation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic deletion + pharmacological dissection + dominant-negatives with temporal pathway resolution","pmids":["10976102"],"is_preprint":false},{"year":2000,"finding":"EPO-induced Shc phosphorylation occurs via direct Shc SH2 domain association with JAK2 rather than requiring receptor cytoplasmic phosphotyrosines; a mitogenically deficient EPOR lacking all cytoplasmic tyrosines still supports Shc-JAK2 association and Shc phosphorylation in vitro.","method":"Co-immunoprecipitation of Shc and JAK2, in vitro cytokine-induced Shc phosphorylation assay, receptor mutants lacking tyrosines","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro assay + receptor mutant co-IP establishing phosphotyrosine-independent JAK2 association, single lab","pmids":["7538110"],"is_preprint":false},{"year":2000,"finding":"TrkB-mediated neuronal survival and axon growth are both dependent on the Shc binding site of TrkB, operating through PI3K and MEK pathways. TrkB mutated at the Shc site poorly supports survival and growth relative to wild-type TrkB; TrkB mutated at the PLC-gamma1 site supports both.","method":"TrkB site-directed mutants expressed in primary sympathetic neurons, PI3K and MEK inhibitor studies, survival and axon growth readouts","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — mutagenesis + inhibitor epistasis in primary neurons with defined functional readouts","pmids":["10985347"],"is_preprint":false},{"year":2000,"finding":"In EGF-stimulated A431 cells, all three ShcA isoforms (P46, P52, P66) translocate from cytoplasm to plasma membrane within 5 min and then redistribute to cytoplasmic vesicle structures co-localizing with EGF receptor and activated c-Src. P52 and P66 (but not P46) augment EGFR-Src complex formation and c-Src activation.","method":"GFP-Shc live imaging, indirect immunofluorescence, co-immunoprecipitation, synthetic peptide competition","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell imaging + co-IP with isoform specificity, single lab","pmids":["10971656"],"is_preprint":false},{"year":2001,"finding":"ShcA expression in neural stem/progenitor cells promotes proliferation via Ras/MAPK and is downregulated as cells differentiate, whereupon ShcC takes over to support viability and neuronal maturation via PI3K-Akt-Bad pathway and persistent MAPK activation. The switch from ShcA to ShcC changes responsiveness from proliferative to survival/differentiation signaling.","method":"ShcC expression analysis, overexpression and functional assays in differentiating neural progenitor cells, PI3K/Akt pathway analysis","journal":"Nature neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional overexpression plus pathway analysis in primary cells, single lab","pmids":["11369938"],"is_preprint":false},{"year":2002,"finding":"Shc p66 and p52 isoforms (but not p46) directly activate c-Src in an isoform-specific manner. Shc-c-Src interaction and c-Src autophosphorylation (activation segment) are demonstrated in vitro and in vivo. A Shc point mutant abolishing c-Src activation identified the interaction site. Shc-mediated c-Src activation triggers the Stat-p21/WAF1 pathway leading to cell cycle arrest.","method":"In vitro c-Src activation assay, co-immunoprecipitation, Shc point mutant that abolishes c-Src activation, isoform-specific analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase activation assay + mutagenesis defining interaction sites + downstream pathway, single lab","pmids":["12048194"],"is_preprint":false},{"year":2002,"finding":"Serine phosphorylation of ShcA (Ser29 in p52; Ser138 in p66) by PKC isoforms (alpha, epsilon, delta) is required together with an intact PTB domain for ShcA binding to PTP-PEST. A PTP-PEST-binding-defective S29A ShcA mutant shows enhanced insulin-induced ERK activation and increased tyrosine phosphorylation, indicating PTP-PEST dephosphorylates ShcA to attenuate insulin signaling.","method":"Phosphorylation site mapping (mass spectrometry), PKC inhibitor and constitutively active PKC constructs, S29A/S138A mutants, co-immunoprecipitation, ERK activation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — phosphosite mapping + mutagenesis + functional consequence demonstrating PTM-dependent interaction, single lab","pmids":["12052829"],"is_preprint":false},{"year":2002,"finding":"ShcA (Shc) is essential for pre-TCR signaling in thymic T cell development: both inducible expression of phosphorylation-defective ShcA (dominant-negative) and conditional Shc locus deletion in thymocytes impaired pre-TCR signaling, proliferation, and differentiation at the same developmental stage.","method":"Cre-loxP conditional knockout, dominant-negative ShcA transgenic mice, T cell development stage analysis","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent genetic approaches (DN transgene + conditional KO) converging on same phenotype","pmids":["12101399"],"is_preprint":false},{"year":2002,"finding":"ShcA is required for TCR-induced activation of c-Rel and IL-2 expression, but is dispensable for CD69/CD25 expression and NFAT activation. In Shc-deficient Jurkat cells, MAP kinase activation was impaired; rescue by exogenous Shc or c-Rel-ER fusion confirmed the pathway order: Shc → MAPK → c-Rel → IL-2.","method":"Shc-deficient Jurkat mutant cells, complementation with exogenous Shc, c-Rel-ER epistasis construct, reporter assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function + complementation + epistasis construct establishing pathway order","pmids":["11917142"],"is_preprint":false},{"year":2002,"finding":"DDR2 receptor tyrosine kinase requires Src activity for maximal tyrosine phosphorylation; Src promotes DDR2 association with Shc via a portion of Shc not previously implicated in RTK interactions. Src is required for DDR2-mediated MMP-2 promoter transactivation.","method":"Co-immunoprecipitation, Src kinase inhibition/knockdown, MMP-2 reporter assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP + functional readout, single lab","pmids":["11884411"],"is_preprint":false},{"year":2002,"finding":"E2 (estrogen) rapidly induces Shc phosphorylation and Shc-Grb2-Sos complex formation in MCF-7 cells. ERalpha and Src act upstream of Shc. Direct physical association between ERalpha and Shc is demonstrated by GST-Shc pulldown; the ShcA PTB and SH2 domains are required to interact with the ERalpha AF-1 domain. Dominant-negative Shc blocks E2-induced MAPK activation.","method":"GST-Shc pulldown, co-immunoprecipitation, Shc domain mutagenesis, dominant-negative Shc, inhibitor studies, confocal microscopy","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro pulldown + domain mutagenesis + dominant-negative functional assay, single lab","pmids":["11773443"],"is_preprint":false},{"year":2007,"finding":"Upon TGF-beta stimulation, the activated TGF-beta type I receptor (TbetaRI) directly recruits and phosphorylates ShcA on both tyrosine and serine residues, using an intrinsic TbetaRI tyrosine kinase activity (dual-specificity kinase). ShcA phosphorylation induces ShcA-Grb2-Sos association, activating the Erk MAP kinase pathway independently of Smad signaling.","method":"In vitro TbetaRI kinase assays, tyrosine kinase-dead and serine-kinase-dead TbetaRI mutants, co-immunoprecipitation, Erk phosphorylation assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay + receptor mutagenesis + multiple orthogonal methods, widely cited","pmids":["17673906"],"is_preprint":false},{"year":2007,"finding":"ShcA signals through combinatorial PTB-, SH2-, and pYXN-dependent interactions for distinct developmental functions: cardiomyocyte ShcA requires PTB but not pYXN motifs for mid-gestational heart development, whereas muscle spindle formation requires both pYXN and PTB/SH2 on the same ShcA molecule.","method":"Knock-in mice with domain-specific ShcA mutations (PTB-dead, pYXN mutants, combined mutants), histological and functional analysis of heart and muscle spindles","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple knock-in genetic models distinguishing domain requirements in vivo","pmids":["17626887"],"is_preprint":false},{"year":2008,"finding":"All three ShcA tyrosine phosphorylation sites (Y239/240, Y313) are involved in early mammary tumor progression. Y313-derived signals are important for tumor cell survival, whereas Y239/240 transduce signals promoting tumor vascularization. Loss of ShcA expression in mammary epithelial cells abrogates tumor development.","method":"Phosphotyrosine-deficient ShcA knock-in mice under endogenous promoter, mammary tumor progression analysis, histological and biochemical readouts","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knock-in genetics with site-specific pY mutations, distinct biological readouts per site","pmids":["18273058"],"is_preprint":false},{"year":2008,"finding":"In endothelial cells exposed to flow, Shc is activated and associates with cell-cell (VE-cadherin) and cell-matrix (integrin) adhesions. Shc activation requires VEGFR2 and Src tyrosine kinases. Shc-VE-cadherin association is matrix-independent; Shc-integrin binding requires VE-cadherin. Shc silencing reduces NF-kappaB-dependent inflammatory signaling and Shc is activated in atherosclerosis-prone arterial regions in vivo.","method":"Co-immunoprecipitation under flow conditions, siRNA knockdown, NF-kappaB reporter assay, in vivo arterial Shc activation analysis, dominant-negative Src/VEGFR2","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP + siRNA + in vivo confirmation with mechanistic pathway dissection","pmids":["18606845"],"is_preprint":false},{"year":2009,"finding":"14-3-3zeta is phosphorylated on Tyr179 in response to GM-CSF and binds the ShcA SH2 domain, assembling a 14-3-3:Shc scaffold that recruits PI3K to regulate Akt activation and cell survival. Y179F 14-3-3 fails to support Akt phosphorylation and viability in primary mast cells reconstituted with this mutant.","method":"Co-immunoprecipitation, 14-3-3zeta KO bone marrow mast cell reconstitution with WT vs. Y179F 14-3-3, Akt activation and viability assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic reconstitution in primary KO cells + co-IP + functional mutation, single lab","pmids":["19218246"],"is_preprint":false},{"year":2010,"finding":"The ShcA PTB domain directly interacts with a helical fragment from the IQGAP1 N-terminal region in a pTyr-independent, non-canonical manner (characterized by NMR). ShcA and IQGAP1 co-precipitate and are co-recruited to membrane ruffles induced by ErbB receptor activation. ShcA knockdown inhibits lamellipodia formation. ShcA PTB binding to IQGAP1 is mutually exclusive with binding to PTP-PEST peptide.","method":"NMR structural characterization, mass spectrometry, co-immunoprecipitation, siRNA knockdown, live-cell imaging of membrane ruffles","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structural validation of direct interaction + co-IP + functional knockdown with multiple orthogonal methods","pmids":["20075861"],"is_preprint":false},{"year":2010,"finding":"p66(Shc) acts as a focal-adhesion-associated reporter of cell attachment. p66(Shc)-null cells show unrestrained Ras activation upon detachment, blocking anoikis. Re-expression of p66(Shc) in metastatic cells (which lack both p66Shc and pRB) restores anoikis and suppresses metastasis in vivo. p66(Shc) coordinates Ras-dependent control of proliferation and anchorage.","method":"Re-expression of p66(Shc) in p66-null metastatic cells, Ras activity assays, anoikis assays, in vivo metastasis models, p66(Shc) and pRB knockdown","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic re-expression + in vivo metastasis model + molecular pathway analysis, single lab","pmids":["20676142"],"is_preprint":false},{"year":2011,"finding":"LRP1 forms a complex with the IGF-1 receptor and is required for ShcA tyrosine phosphorylation and membrane translocation in response to IGF-1. ShcA presence directs IGF-1 signaling toward Ras/MAP kinase; in the absence of ShcA, IGF-1 signaling bifurcates to Akt/mTOR, accelerating adipocyte differentiation.","method":"Co-immunoprecipitation, LRP1/ShcA siRNA knockdown, membrane fractionation, Ras/MAPK and Akt/mTOR activation assays, adipogenesis assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA knockdown of both components + pathway bifurcation demonstrated with multiple readouts, single lab","pmids":["21454706"],"is_preprint":false},{"year":2013,"finding":"Shc1 responds to EGF stimulation through multiple sequential phosphorylation events and protein interactions: an initial wave recruits Grb2 to Shc1 pTyr sites, activating pro-mitogenic/survival pathways; Akt-mediated feedback then phosphorylates Shc1 Ser29, recruiting the Ptpn12 tyrosine phosphatase; Ptpn12 then acts as a switch converting Shc1 from pTyr/Grb2-based signaling to SgK269-mediated cytoskeletal/trafficking pathways regulating cell invasion.","method":"Quantitative mass spectrometry of Shc1 complexes over time, phosphomutant analysis, Ptpn12 co-IP, cell invasion and morphogenesis assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative MS with temporal resolution + mutagenesis + multiple functional readouts, single lab with extensive orthogonal methods","pmids":["23846654"],"is_preprint":false},{"year":2015,"finding":"p52ShcA competes with Smad3 for TGF-beta receptor binding, sequesters TGF-beta receptor complexes to caveolin-associated membrane compartments (preventing clathrin-dependent Smad activation), and thereby protects epithelial cells from TGF-beta-induced EMT. ShcA knockdown enhances receptor localization in clathrin compartments, increases Smad3 activation, and induces EMT with increased migration, invasion, and stem cell generation.","method":"Co-immunoprecipitation, compartment fractionation (caveolin vs. clathrin), ShcA siRNA knockdown, Smad3 activation assays, EMT and invasion assays, mammosphere formation","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — receptor competition assay + compartmentalization fractionation + siRNA with multiple functional readouts, single lab","pmids":["26680585"],"is_preprint":false},{"year":2016,"finding":"DDR1b-mediated collagen I-induced N-cadherin upregulation requires Shc1 binding to DDR1b Tyr513 via its PTB domain. The signaling does not require the Shc1 SH2 domain or pY239/240/313 but requires a segment of the Shc1 central domain interacting with the proline-rich region of Pyk2, positioning Shc1 as a scaffold coupling DDR1b and Pyk2.","method":"Shc1 knockdown, PTB-domain mutants, SH2-domain mutants, pY mutants, Y513F DDR1b mutant, domain-specific interaction assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic mutagenesis of both receptor and adaptor domains identifying non-canonical interaction, single lab","pmids":["27605668"],"is_preprint":false},{"year":2017,"finding":"ShcA simultaneously activates STAT3 immunosuppressive signals and impairs STAT1-driven immune surveillance in breast cancer cells. Impaired Y239/Y240-ShcA phosphorylation selectively reduces STAT3 activation in tumors, sensitizing them to immune checkpoint inhibitors.","method":"pY-deficient ShcA knock-in mouse models, STAT3 and STAT1 activation assays, immune checkpoint immunotherapy experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — site-specific knock-in genetics + multiple downstream pathway analysis + functional immunotherapy readouts","pmids":["28276425"],"is_preprint":false},{"year":2017,"finding":"ShcA associates with nephrin (a podocyte slit diaphragm protein) via its SH2 domain binding to multiple phosphorylated tyrosine residues on nephrin. ShcA overexpression promotes nephrin tyrosine phosphorylation, reduces nephrin cell-surface expression, and decreases nephrin signaling. In a rat injury model, phospho-nephrin colocalizes with endocytic structures coincident with ShcA upregulation.","method":"Co-immunoprecipitation, GST pulldown, ShcA overexpression, in vivo biotinylation assay for surface vs. cytosolic nephrin, rat injury model","journal":"Journal of the American Society of Nephrology","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP + in vitro pulldown + in vivo surface expression assay + disease model, single lab","pmids":["29018139"],"is_preprint":false},{"year":2018,"finding":"In endothelial cells, SHC1 recruits the PP2A scaffolding subunit to the proline-rich apoER2 C-terminus along with two distinct PP2A regulatory subunits in response to antiphospholipid antibodies (aPL), enabling inhibitory dephosphorylation of Akt and eNOS and promoting thrombosis. This was demonstrated by aPL-induced assembly of the apoER2/Dab2/SHC1/PP2A complex.","method":"Co-immunoprecipitation of apoER2-Dab2-SHC1-PP2A complex, SHC1 knockdown, Akt and eNOS phosphorylation assays, in vivo thrombosis model","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — complex assembly co-IP + in vivo mouse model + multiple phosphorylation readouts, single lab","pmids":["29500169"],"is_preprint":false},{"year":2019,"finding":"Genetic ablation of the p52SHC isoform (but not p66SHC) significantly attenuates DMBA-induced mammary tumor formation in rats, identifying p52SHC as the oncogenic isoform driving breast cancer initiation. p52SHC KO disrupted ESR1 and mTORC2/RICTOR pathway gene networks.","method":"Germline isoform-specific p52SHC and p66SHC knockout rats, DMBA mammary tumor induction model, RNA-seq, gene network analysis","journal":"Breast cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — first isoform-specific KO in vivo model, direct comparison between p52 and p66 KOs","pmids":["31202267"],"is_preprint":false},{"year":2021,"finding":"Endothelial Shc acts downstream of the mechanoreceptor Alk5 to mediate shear-stress-induced endothelial-to-mesenchymal transition (EndMT) and atherosclerosis. Genetic targeting of endothelial Shc reduces EndMT and atherosclerosis in areas of disturbed flow. Alk5-mediated mechanosensing drives Shc activation independently of other mechanosensors.","method":"Endothelial-specific Shc genetic targeting (in vivo), Alk5 depletion, reconstitution experiments with tensional force, atherosclerosis model","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo endothelial-specific genetic targeting + reconstitution experiments establishing Alk5-Shc mechanosensory axis","pmids":["34244146"],"is_preprint":false},{"year":2003,"finding":"ShcA (via its SH2 domain) binds Tyr1101 of the Tie2 receptor following angiopoietin-1 stimulation, leading to Shc phosphorylation. Dominant-negative ShcA impairs angiopoietin-1-induced endothelial chemotaxis and sprouting (but not survival) and partially reduces PI3K p85 tyrosine phosphorylation.","method":"In vitro co-immunoprecipitation, pulldown with Tie2 phosphopeptides, overexpression of dominant-negative ShcA, chemotaxis and sprouting assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP + dominant-negative functional assay + specific Tyr mapping, single lab","pmids":["14665640"],"is_preprint":false},{"year":2010,"finding":"Chlamydia trachomatis effector protein Tarp interacts with SHC1 as one of its strongest binding partners (demonstrated by phosphopeptide-SH2/PTB domain protein array). SHC1 knockdown in C. trachomatis-infected cells sensitizes them to TNF-induced apoptosis, identifying SHC1-dependent regulation of apoptosis-related genes as important for early chlamydial infection survival.","method":"Protein microarray of all human SH2/PTB domains, quantitative binding measurements, SHC1 siRNA knockdown, apoptosis assay, transcriptome analysis","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — comprehensive domain array + siRNA functional validation, single lab","pmids":["20624904"],"is_preprint":false},{"year":2014,"finding":"p66(Shc) is phosphorylated at Ser36 in response to pathological cyclic stretch in endothelial cells, downstream of integrin alpha5beta1 and c-Jun N-terminal kinase. This phosphorylation activates NADPH oxidase, increases ROS production, and reduces nitric oxide bioavailability. Silencing p66(Shc) blunts these stretch-induced effects.","method":"Cyclic stretch of primary human aortic endothelial cells, integrin inhibition, JNK inhibition, p66(Shc) siRNA knockdown, ROS and NADPH oxidase assays, NO bioavailability measurements","journal":"Hypertension","confidence":"High","confidence_rationale":"Tier 2 / Strong — pharmacological pathway dissection + siRNA + multiple orthogonal readouts, single lab","pmids":["24842918"],"is_preprint":false},{"year":2018,"finding":"Idebenone physically binds Shc protein (p52 isoform) and inhibits Shc's competition with IRS1 downstream of the insulin receptor. Genetic depletion of Shc's target eliminates idebenone's ability to insulin-sensitize in vivo. Multiple target-engagement assays confirm direct idebenone-Shc binding.","method":"In vitro Shc binding assays (multiple orthogonal assays), p52Shc genetic depletion in mice, insulin sensitivity assays (two mouse models), drug screening of 1680 compounds","journal":"Pharmacological research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding assays + in vivo genetic validation of target specificity, single lab with multiple methods","pmids":["30290222"],"is_preprint":false}],"current_model":"SHC1 (ShcA) is a modular phosphotyrosine adaptor protein that couples activated receptor tyrosine kinases, cytokine receptors, integrins, G-protein-coupled receptors, and mechanosensors to downstream signaling cascades—primarily Ras/MAPK and PI3K/Akt—by recruiting Grb2-Sos complexes to its pY239/240 and pY313 sites after PTB- or SH2-domain-mediated docking on activated receptors; it also regulates cytoskeletal organization via non-canonical PTB-domain interactions with IQGAP1, controls receptor compartmentalization (caveolin vs. clathrin) to modulate Smad vs. Erk signaling, acts as a temporal scaffold that undergoes Akt-mediated Ser29 feedback phosphorylation to recruit Ptpn12 and switch signaling outputs, and, through its p66 isoform, functions as a mitochondrial redox enzyme that generates ROS, promotes apoptosis, and suppresses Ras hyperactivation to regulate anoikis, lifespan, and metabolic/vascular stress responses."},"narrative":{"mechanistic_narrative":"SHC1 (ShcA) is a modular phosphotyrosine adaptor that couples activated receptors—receptor tyrosine kinases, cytokine receptors, integrins, G-protein-coupled receptors, and mechanosensors—to downstream Ras/MAPK and PI3K/Akt signaling [PMID:8195171, PMID:10809671, PMID:10982827]. It docks on activated receptors through two phosphotyrosine-reading modules: an SH2 domain that binds autophosphorylated receptors such as the PDGF beta-receptor and the EGF receptor [PMID:8195171, PMID:7925272], and a PTB domain that engages high-affinity sites such as Ret/ptc2 Tyr586 [PMID:9047384]. Receptor-induced phosphorylation of ShcA at Tyr239/240 and Tyr313 creates pYXN motifs that recruit Grb2-Sos, amplifying Ras activation [PMID:7731718, PMID:10482988, PMID:10982827], and site-specific knock-in studies show these tyrosines partition distinct outputs, with Y313 driving tumor cell survival and Y239/240 driving vascularization and STAT3 immunosuppressive signaling [PMID:18273058, PMID:28276425]. ShcA also reads cytokine receptors indirectly by binding JAK2 directly through its SH2 domain (growth hormone, IL-6, erythropoietin receptors), feeding the same Grb2/Ras axis [PMID:7535773, PMID:9126968, PMID:7538110], and routes PI3K/Akt activation via a Shc→Grb2→Gab2→PI3K cascade and a 14-3-3:Shc scaffold [PMID:10982827, PMID:19218246]. Beyond canonical pY signaling, the PTB domain mediates non-canonical, phosphotyrosine-independent interactions with IQGAP1 to drive lamellipodia and membrane ruffling [PMID:20075861], and ShcA acts as a temporal scaffold whose Akt-mediated Ser29 feedback phosphorylation recruits the phosphatase Ptpn12 (and PTP-PEST) to switch outputs from Grb2-based mitogenic signaling toward cytoskeletal/trafficking pathways [PMID:12052829, PMID:23846654]. ShcA controls receptor compartmentalization, sequestering TGF-beta receptors to caveolin compartments to suppress Smad-driven EMT while enabling Erk signaling [PMID:17673906, PMID:26680585]. Through its p66 isoform, ShcA reports cell attachment at focal adhesions to restrain Ras and enforce anoikis, and generates ROS via NADPH oxidase under mechanical stretch to regulate vascular stress responses [PMID:20676142, PMID:24842918]. Genetically, ShcA is required in vivo for cardiovascular development, pre-TCR and TCR signaling in T cells, neuronal survival, and mammary tumorigenesis, with the p52 isoform identified as the oncogenic driver of breast cancer initiation [PMID:10809671, PMID:12101399, PMID:11917142, PMID:10985347, PMID:31202267].","teleology":[{"year":1994,"claim":"Established that ShcA is a direct phosphotyrosine adaptor for activated receptor tyrosine kinases, defining how it physically engages receptors and links them to Grb2/Ras.","evidence":"GST-SH2 pulldown with purified PDGF beta-receptor plus mutagenesis, and in vivo EGFR co-IP with subcellular fractionation","pmids":["8195171","7925272"],"confidence":"High","gaps":["Whether receptor-specific compartmentalization (endosomal vs. plasma membrane) is general across all RTKs was not resolved","The functional consequence of isoform-preferential phosphorylation was not yet established"]},{"year":1995,"claim":"Defined the pYXN/Grb2-recruitment logic and showed ShcA integrates non-RTK inputs (GPCR Gβγ, JAK2 from cytokine receptors), establishing it as a convergence node for diverse upstream signals.","evidence":"BIAcore binding of Tyr317-phosphorylated Shc to Grb2 with functional migration readout; co-IP and pharmacological dissection of Gβγ- and JAK2-driven Shc phosphorylation","pmids":["7731718","7568118","7535773","7544794"],"confidence":"High","gaps":["Whether SH2 vs. PTB docking dominates was receptor-dependent and not unified","In vivo relevance of GPCR-to-Shc coupling not tested genetically"]},{"year":1996,"claim":"Showed ShcA couples integrins, not just soluble growth factors, to MAPK and cell-cycle progression, and identified phosphotyrosine-independent interactions (adaptins) that hint at trafficking roles.","evidence":"Dominant-negative Shc, integrin alpha-subunit domain swaps and co-IP; GST-Shc affinity chromatography mapping adaptin binding to the CH1 region","pmids":["8929541","8617812"],"confidence":"High","gaps":["The mechanism linking caveolin to integrin-Shc recruitment was not molecularly resolved","Functional consequence of Shc-adaptin binding for endocytosis untested"]},{"year":1997,"claim":"Distinguished the high-affinity PTB-domain docking mode from SH2 docking and extended Shc engagement to cytokine receptors and adhesion molecules, clarifying domain-specific receptor selection.","evidence":"In vitro PTB vs. SH2 binding to Ret/ptc2 with Y586F mutagenesis; gp130/Jak2 domain-specific co-IP; cadherin SH2 binding by yeast two-hybrid and in vitro pulldown","pmids":["9047384","9126968","9153187"],"confidence":"High","gaps":["Whether PTB and SH2 occupancy is simultaneous or competitive on a given receptor not addressed","Physiological output of cadherin-Shc binding not defined"]},{"year":1998,"claim":"Provided in vivo genetic proof that Shc recruitment is required for tumor progression and that PTB-mediated docking can require accessory localization factors.","evidence":"Transgenic PyV MT Shc-binding-site mutants with biochemical reversion analysis; chimeric Ret/ptc2 receptors with Enigma co-localization and Ras/Raf epistasis","pmids":["9528804","9528800"],"confidence":"High","gaps":["Which downstream Shc effector (Ras vs. PI3K) drives metastasis was not isolated here","Generality of localization-dependent PTB signaling beyond Ret unknown"]},{"year":1999,"claim":"Resolved that ShcA bidirectionally regulates migration vs. proliferation through distinct domains and is counter-regulated by phosphatases, establishing it as a tunable signaling switch.","evidence":"Domain-specific Shc mutants in migration/proliferation assays; in vitro PTEN phosphatase assay on Shc and SHIP co-IP via PTB domain","pmids":["10613912","10427092","10482988"],"confidence":"Medium","gaps":["The PAL SH2 interaction rests on a single yeast two-hybrid result without in-cell validation (#18)","Direct phosphatase competition with kinase input not quantified in vivo"]},{"year":2000,"claim":"Genetic knockout and pathway reconstitution established ShcA's essential developmental role and ordered the Shc→Grb2→Gab2→PI3K/Akt cascade alongside parallel ERK pathways.","evidence":"ShcA-null mice with cardiovascular defects and MAPK analysis; chimeric cytokine-receptor reconstitution defining Gab2/PI3K pathway order; parallel Shc vs. FAK ERK dissection","pmids":["10809671","10982827","10976102","10985347","7538110"],"confidence":"High","gaps":["How Shc selects between Ras/MAPK and PI3K/Akt outputs was not mechanistically resolved","Tissue-specific domain requirements not yet dissected"]},{"year":2002,"claim":"Established isoform-specific c-Src activation and PTM-dependent phosphatase recruitment, and demonstrated ShcA's requirement in T-cell development and TCR signaling order.","evidence":"In vitro c-Src activation assay with Shc point mutants; Ser29/Ser138 phosphosite mapping with S29A mutants and PTP-PEST co-IP; conditional Shc KO and dominant-negative thymocytes; Shc-deficient Jurkat complementation defining Shc→MAPK→c-Rel→IL-2","pmids":["12048194","12052829","12101399","11917142","11884411","11773443"],"confidence":"High","gaps":["The full set of serine kinases controlling PTP-PEST recruitment in distinct receptor contexts not enumerated","Isoform-specific c-Src activation mechanism structurally undefined"]},{"year":2007,"claim":"Revealed that ShcA carries non-canonical signaling, being directly phosphorylated by the TGF-beta receptor (a dual-specificity kinase) and using combinatorial domain requirements for distinct developmental programs.","evidence":"In vitro TbetaRI kinase assays with kinase-dead mutants and Erk readouts; domain-specific knock-in mice (PTB-dead, pYXN mutants) for heart and muscle spindle phenotypes","pmids":["17673906","17626887"],"confidence":"High","gaps":["How a single receptor selects ShcA-Erk vs. Smad outputs was not yet defined","Structural basis for combinatorial PTB/SH2/pYXN cooperation not determined"]},{"year":2008,"claim":"Site-specific knock-in genetics partitioned ShcA tyrosine outputs into discrete biological functions (survival vs. vascularization), explaining how one adaptor produces divergent tumor phenotypes.","evidence":"Endogenous-promoter pY-deficient ShcA knock-in mice with mammary tumor progression analysis","pmids":["18273058"],"confidence":"High","gaps":["The distinct effector complexes assembled at Y313 vs. Y239/240 were not biochemically separated here","Quantitative contribution of each site to overall tumor burden not isolated"]},{"year":2010,"claim":"Defined ShcA's non-canonical PTB-IQGAP1 cytoskeletal axis structurally and established p66Shc as a focal-adhesion attachment reporter controlling anoikis and metastasis.","evidence":"NMR characterization of PTB-IQGAP1 binding with siRNA lamellipodia assays; p66Shc re-expression in null metastatic cells with Ras activity and in vivo metastasis assays","pmids":["20075861","20676142","20624904"],"confidence":"High","gaps":["How PTB switches between IQGAP1, PTP-PEST and receptor ligands in cells not temporally resolved","Molecular basis of p66Shc Ras suppression at focal adhesions not fully defined"]},{"year":2013,"claim":"Quantitative temporal proteomics established ShcA as a dynamic scaffold whose Akt-driven Ser29 feedback phosphorylation recruits Ptpn12 to switch outputs from Grb2-mitogenic to cytoskeletal/trafficking signaling.","evidence":"Time-resolved quantitative mass spectrometry of Shc1 complexes after EGF, phosphomutant analysis, Ptpn12 co-IP and invasion assays","pmids":["23846654"],"confidence":"High","gaps":["The full SgK269-mediated effector branch downstream of the switch is not detailed","Whether the same temporal switch operates at non-EGFR receptors untested"]},{"year":2015,"claim":"Showed ShcA controls signaling outcome by physically directing receptor compartmentalization, sequestering TGF-beta receptors to caveolin compartments to suppress Smad-driven EMT.","evidence":"Receptor competition co-IP, caveolin vs. clathrin fractionation, ShcA siRNA with EMT, invasion and mammosphere assays","pmids":["26680585"],"confidence":"High","gaps":["The structural determinant routing receptors to caveolin vs. clathrin not mapped","Whether this compartmentalization mechanism generalizes to other receptor families unknown"]},{"year":2017,"claim":"Extended ShcA function to immune evasion and adhesion-receptor scaffolding, and to slit-diaphragm regulation, broadening its roles beyond mitogenic signaling.","evidence":"pY-deficient knock-in mice linking Y239/240 to STAT3/STAT1 balance and checkpoint sensitivity; DDR1b Y513 PTB-domain coupling to Pyk2; nephrin SH2 binding with in vivo surface-expression assays","pmids":["28276425","27605668","29018139"],"confidence":"High","gaps":["Mechanism by which Y239/240-Shc selectively activates STAT3 not biochemically resolved","Direct kinase-substrate relationships in the nephrin endocytosis pathway not fully defined"]},{"year":2021,"claim":"Established ShcA as a mechanotransduction node in the endothelium, acting downstream of receptors and mechanosensors to drive vascular pathology, and identified isoform- and drug-level specificity.","evidence":"Endothelial-specific Shc genetic targeting and Alk5 reconstitution in atherosclerosis models; flow- and stretch-induced Shc/p66Shc pathway dissection; isoform-specific p52/p66 KO rats; idebenone-Shc direct binding with genetic target validation","pmids":["34244146","18606845","24842918","31202267","30290222","29500169","14665640","21454706","11369938"],"confidence":"High","gaps":["How distinct mechanosensors converge on a common Shc activation step is not unified","Structural basis for p52 vs. p66 functional divergence remains undefined"]},{"year":null,"claim":"How ShcA integrates its many domain-specific, isoform-specific, and PTM-gated interactions into a single decision-making logic that selects among Ras/MAPK, PI3K/Akt, cytoskeletal, redox, and compartmentalization outputs in a given cell remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No unified structural/quantitative model predicting output selection from input identity","The full p66Shc mitochondrial redox mechanism is not represented mechanistically in this corpus","Interplay between competing PTB ligands (IQGAP1, PTP-PEST, receptors) in vivo not quantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,3,21,38,41]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,25]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[25,40]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[1,25]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,3,21,33]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[14,35,47,48]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[29,30,44]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[9,22]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[20,24,34]}],"complexes":["Shc-Grb2-Sos complex","apoER2/Dab2/SHC1/PP2A complex"],"partners":["GRB2","JAK2","SRC","IQGAP1","PTPN12","GAB2","YWHAZ","PTPN12/PTP-PEST"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P29353","full_name":"SHC-transforming protein 1","aliases":["SHC-transforming protein 3","SHC-transforming protein A","Src homology 2 domain-containing-transforming protein C1","SH2 domain protein C1"],"length_aa":583,"mass_kda":62.8,"function":"Signaling adapter that couples activated growth factor receptors to signaling pathways. Participates in a signaling cascade initiated by activated KIT and KITLG/SCF. Isoform p46Shc and isoform p52Shc, once phosphorylated, couple activated receptor tyrosine kinases to Ras via the recruitment of the GRB2/SOS complex and are implicated in the cytoplasmic propagation of mitogenic signals. Isoform p46Shc and isoform p52Shc may thus function as initiators of the Ras signaling cascade in various non-neuronal systems. Isoform p66Shc does not mediate Ras activation, but is involved in signal transduction pathways that regulate the cellular response to oxidative stress and life span. Isoform p66Shc acts as a downstream target of the tumor suppressor p53 and is indispensable for the ability of stress-activated p53 to induce elevation of intracellular oxidants, cytochrome c release and apoptosis. The expression of isoform p66Shc has been correlated with life span (By similarity). Participates in signaling downstream of the angiopoietin receptor TEK/TIE2, and plays a role in the regulation of endothelial cell migration and sprouting angiogenesis","subcellular_location":"Mitochondrion","url":"https://www.uniprot.org/uniprotkb/P29353/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SHC1","classification":"Not Classified","n_dependent_lines":170,"n_total_lines":1208,"dependency_fraction":0.14072847682119205},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CTTN","stoichiometry":0.2},{"gene":"GRB2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SHC1","total_profiled":1310},"omim":[{"mim_id":"611027","title":"SHC-BINDING AND SPINDLE-ASSOCIATED PROTEIN 1; SHCBP1","url":"https://www.omim.org/entry/611027"},{"mim_id":"610278","title":"PLATELET ENDOTHELIAL AGGREGATION RECEPTOR 1; PEAR1","url":"https://www.omim.org/entry/610278"},{"mim_id":"609732","title":"LIGAND OF NUMB PROTEIN X1; LNX1","url":"https://www.omim.org/entry/609732"},{"mim_id":"605903","title":"PDZ AND LIM DOMAIN PROTEIN 7; PDLIM7","url":"https://www.omim.org/entry/605903"},{"mim_id":"605384","title":"INTERLEUKIN 21; IL21","url":"https://www.omim.org/entry/605384"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Cytosol","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SHC1"},"hgnc":{"alias_symbol":["p66","ShcA"],"prev_symbol":["SHC"]},"alphafold":{"accession":"P29353","domains":[{"cath_id":"2.30.29.30","chopping":"153-318","consensus_level":"high","plddt":86.1601,"start":153,"end":318},{"cath_id":"3.30.505.10","chopping":"487-579","consensus_level":"high","plddt":85.8525,"start":487,"end":579}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P29353","model_url":"https://alphafold.ebi.ac.uk/files/AF-P29353-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P29353-F1-predicted_aligned_error_v6.png","plddt_mean":62.41},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SHC1","jax_strain_url":"https://www.jax.org/strain/search?query=SHC1"},"sequence":{"accession":"P29353","fasta_url":"https://rest.uniprot.org/uniprotkb/P29353.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P29353/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P29353"}},"corpus_meta":[{"pmid":"8929541","id":"PMC_8929541","title":"The adaptor protein Shc couples a class of integrins to the control of cell cycle progression.","date":"1996","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/8929541","citation_count":649,"is_preprint":false},{"pmid":"17673906","id":"PMC_17673906","title":"TGF-beta activates Erk MAP kinase signalling through direct phosphorylation of ShcA.","date":"2007","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/17673906","citation_count":471,"is_preprint":false},{"pmid":"10427092","id":"PMC_10427092","title":"Shc and FAK differentially regulate cell motility and directionality modulated by PTEN.","date":"1999","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/10427092","citation_count":368,"is_preprint":false},{"pmid":"10985347","id":"PMC_10985347","title":"The TrkB-Shc site signals neuronal survival and local axon growth via MEK and P13-kinase.","date":"2000","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/10985347","citation_count":363,"is_preprint":false},{"pmid":"11773443","id":"PMC_11773443","title":"Linkage of rapid estrogen action to MAPK activation by ERalpha-Shc association and Shc pathway activation.","date":"2002","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/11773443","citation_count":357,"is_preprint":false},{"pmid":"11607835","id":"PMC_11607835","title":"Signaling via Shc family adapter proteins.","date":"2001","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/11607835","citation_count":344,"is_preprint":false},{"pmid":"7925272","id":"PMC_7925272","title":"Compartmentalization of SHC, GRB2 and mSOS, and hyperphosphorylation of Raf-1 by EGF but not insulin in liver parenchyma.","date":"1994","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/7925272","citation_count":294,"is_preprint":false},{"pmid":"23846654","id":"PMC_23846654","title":"Temporal regulation of EGF signalling networks by the scaffold protein Shc1.","date":"2013","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/23846654","citation_count":244,"is_preprint":false},{"pmid":"10982827","id":"PMC_10982827","title":"New role for Shc in activation of the phosphatidylinositol 3-kinase/Akt pathway.","date":"2000","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/10982827","citation_count":219,"is_preprint":false},{"pmid":"22693349","id":"PMC_22693349","title":"Gene silencing of the mitochondrial adaptor p66(Shc) suppresses vascular hyperglycemic memory in diabetes.","date":"2012","source":"Circulation research","url":"https://pubmed.ncbi.nlm.nih.gov/22693349","citation_count":213,"is_preprint":false},{"pmid":"17360381","id":"PMC_17360381","title":"Genetic deletion of p66(Shc) adaptor protein prevents hyperglycemia-induced endothelial dysfunction and oxidative stress.","date":"2007","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/17360381","citation_count":203,"is_preprint":false},{"pmid":"11088019","id":"PMC_11088019","title":"Evolution of Shc functions from nematode to human.","date":"2000","source":"Current opinion in genetics & development","url":"https://pubmed.ncbi.nlm.nih.gov/11088019","citation_count":177,"is_preprint":false},{"pmid":"9528804","id":"PMC_9528804","title":"Requirement for both Shc and phosphatidylinositol 3' kinase signaling pathways in polyomavirus middle T-mediated mammary tumorigenesis.","date":"1998","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/9528804","citation_count":176,"is_preprint":false},{"pmid":"7731718","id":"PMC_7731718","title":"The motogenic and mitogenic responses to HGF are amplified by the Shc adaptor 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Multiple autophosphorylation sites on the PDGF beta-receptor (Tyr-579, Tyr-740, Tyr-751, Tyr-771) mediate Shc SH2 domain binding. Receptor activation induces preferential phosphorylation of p52Shc, which then associates with Grb2.\",\n      \"method\": \"Co-immunoprecipitation, GST-SH2 domain pulldown with purified baculovirus-expressed receptor, synthetic peptide analysis, mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct binding demonstrated with purified proteins in vitro plus mutagenesis identifying specific binding sites\",\n      \"pmids\": [\"8195171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Following EGF stimulation in rat liver, SHC is recruited to and tyrosine-phosphorylated by the EGF receptor (primarily at pTyr-1173), associates with GRB2 and mSOS largely in endosomes, forming a cytosolic complex that links to Ras activation (evidenced by Raf-1 mobility shift). Insulin receptor activation does not detectably phosphorylate SHC or recruit GRB2/mSOS in the same cells, demonstrating receptor-specific compartmentalization.\",\n      \"method\": \"In vivo receptor stimulation, subcellular fractionation, co-immunoprecipitation, Western blotting\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP with fractionation in vivo, replicated across multiple time points with clear controls\",\n      \"pmids\": [\"7925272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Shc associates with the PEST tyrosine phosphatase (PTP-PEST) via its amino-terminal half (p52 and p66 but not p46 isoforms). Complex formation is stimulated 6–8-fold by PKC activator PMA but not by EGF or serum, linking G-protein receptor/PKC crosstalk to Shc regulation.\",\n      \"method\": \"Yeast two-hybrid screen, GST pulldown, co-immunoprecipitation from HeLa and neuroblastoma cells, isoform-specific analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus yeast 2-hybrid, single lab\",\n      \"pmids\": [\"7929214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"HGF receptor tyrosine phosphorylates ShcA via docking at pY1349 and pY1356 (Kd ~150 nM each via BIAcore); this leads to Shc phosphorylation at Y317, creating a high-affinity Grb2 binding site (Kd 15 nM), thereby amplifying Ras pathway activation. Overexpression of wild-type Shc but not Y317F mutant enhances HGF-induced cell migration and growth.\",\n      \"method\": \"Site-directed mutagenesis of HGF receptor, BIAcore biosensor binding assay, overexpression of wild-type vs. Y317F mutant Shc\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro binding assay with purified proteins + mutagenesis + functional readout, single lab\",\n      \"pmids\": [\"7731718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Gbeta-gamma subunits of heterotrimeric G proteins stimulate tyrosine phosphorylation of the Shc p46/p52 isoforms, representing an early step in Gi-coupled receptor-mediated Ras/MAP kinase activation. Phosphorylation is blocked by a G-beta-gamma-binding PH domain peptide, tyrosine kinase inhibitors, and wortmannin (PI3K inhibitor), but not by dominant-negative Ras.\",\n      \"method\": \"Overexpression of G-beta-gamma or alpha2-adrenergic receptor in COS-7 cells, anti-phosphotyrosine immunoprecipitation, anti-Shc immunoprecipitation, pertussis toxin treatment, inhibitor studies\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with pharmacological dissection, single lab\",\n      \"pmids\": [\"7568118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"G protein-coupled chemoattractant (N-formyl peptide) receptor activates the Src-family kinase Lyn, which binds to Shc (via the Shc SH2 domain) and phosphorylates it on tyrosine. Phospho-Shc/phospho-Lyn complexes then associate with PI3K, correlating with PI3,4,5-P3 generation.\",\n      \"method\": \"Co-immunoprecipitation from human neutrophils, Western blot, SH2-domain binding studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP in primary human cells, single lab\",\n      \"pmids\": [\"7650013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Growth hormone (GH) promotes rapid tyrosyl phosphorylation of all three ShcA isoforms (p66, p52, p46) through JAK2. The ShcA SH2 domain binds tyrosyl-phosphorylated JAK2 directly (shown with constitutively phosphorylated JAK2 in COS-7 cells). Grb2 subsequently associates with phosphorylated ShcA in a GH-dependent manner. GHR domains required for ShcA phosphorylation were mapped by mutagenesis.\",\n      \"method\": \"GST-SHC SH2 domain pulldown, co-immunoprecipitation, GHR mutagenesis in CHO cells, Western blotting\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro pulldown with purified proteins + receptor mutagenesis + co-IP, single lab\",\n      \"pmids\": [\"7535773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"MAP kinase phosphorylates the C-terminal tail of mSos1 in vitro at sites shared with EGF-stimulated cells, and this phosphorylation disrupts mSos1-Grb2 binding to Shc and the EGF receptor, providing a negative-feedback mechanism attenuating Ras activation downstream of Shc.\",\n      \"method\": \"In vitro MAP kinase phosphorylation of mSos1, tryptic phosphopeptide mapping, binding assays with phosphorylated vs. unphosphorylated mSos1\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified kinase + peptide mapping + binding assays, single lab\",\n      \"pmids\": [\"7478566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Insulin receptor preferentially phosphorylates the p52 ShcA isoform (4-fold higher Vmax than p46 in vitro) and shows differential binding to p52 vs. p46 in vitro; EGF receptor phosphorylates both isoforms equivalently. Grb2 predominantly associates with p52ShcA after insulin stimulation.\",\n      \"method\": \"In vitro kinase assay with purified isoforms, co-immunoprecipitation, CHO cell overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with purified proteins + in vivo co-IP, single lab\",\n      \"pmids\": [\"7544794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Shc couples a class of integrins to cell cycle progression and MAP kinase activation. The recruitment of Shc by integrins is specified by the extracellular/transmembrane domain of specific integrin alpha subunits and is mediated by caveolin. Dominant-negative Shc and mutagenesis demonstrate Shc is necessary and sufficient for integrin-mediated MAP kinase activation and cooperation with mitogens to drive G1 transit.\",\n      \"method\": \"Co-immunoprecipitation, mutagenesis, dominant-negative inhibition, integrin alpha-subunit domain swaps\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dominant-negative and mutagenesis + co-IP across multiple integrins, highly cited and replicated\",\n      \"pmids\": [\"8929541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Shc interacts with alpha- and beta-adaptins (components of clathrin adaptor complexes involved in receptor endocytosis) via amino acids 346–355 in the collagen homologous (CH1) region. This interaction is phosphotyrosine-independent.\",\n      \"method\": \"GST-Shc affinity chromatography from bovine brain lysates, peptide sequencing, co-immunoprecipitation, domain-deletion GST-Shc mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pulldown + co-IP + domain mapping, single lab\",\n      \"pmids\": [\"8617812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Shc mediates IL-6 signaling by associating in vivo and in vitro with phosphorylated gp130 through the Shc SH2 domain and with activated Jak2 via the Shc PTB (phosphotyrosine-binding) domain. IL-6 stimulation induces Shc-Grb2 association, linking Jak2 to the Ras/MAP kinase pathway.\",\n      \"method\": \"Co-immunoprecipitation in vivo and in vitro, domain-specific binding assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro co-IP with domain specificity, single lab\",\n      \"pmids\": [\"9126968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The Shc PTB domain binds Ret/ptc2 at Tyr586 (Tyr1062 of proto-Ret) with ~20-fold higher affinity than the Shc SH2 domain; a Y586F Ret/ptc2 mutant abolishes Shc docking. Both Shc PTB and SH2 domains interact with Ret/ptc2 in vitro.\",\n      \"method\": \"In vitro pulldown with Shc PTB and SH2 domains, site-directed mutagenesis (Y586F), co-immunoprecipitation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro domain binding + mutagenesis establishing specific docking site, single lab\",\n      \"pmids\": [\"9047384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"ShcA interacts via its SH2 domain with the cytoplasmic domain of cadherin in a phosphotyrosine-dependent manner, demonstrated by yeast two-hybrid, co-precipitation from mammalian cells, and direct biochemical pulldown. EGF stimulation abrogates this association.\",\n      \"method\": \"Yeast two-hybrid, co-precipitation from A-431 cells, direct in vitro biochemical pulldown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — three independent methods including direct in vitro binding, single lab\",\n      \"pmids\": [\"9153187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"PyV middle T antigen-mediated mammary tumorigenesis requires both Shc and PI3K signaling: Shc-binding-site mutant MT failed to efficiently form metastatic mammary tumors in transgenic mice; metastatic tumors arising in these mice showed reversion of the Shc binding site, genetically confirming Shc's requirement for tumor progression.\",\n      \"method\": \"Transgenic mouse models with PyV MT mutants decoupled from Shc or PI3K, genetic and biochemical reversion analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic epistasis in transgenic models with biochemical reversion analysis, replicated across cohorts\",\n      \"pmids\": [\"9528804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The Shc PTB domain interacts with Ret/ptc2 at Tyr586 and results in Shc tyrosine phosphorylation. Mitogenic signaling from Ret/ptc2 requires both Shc recruitment (via Y586) and subcellular localization via Enigma; Shc and Enigma bind the same Ret/ptc2 site on individual monomers, so dimerization enables assembly of both.\",\n      \"method\": \"Co-immunoprecipitation, chimeric receptor constructs, dominant-negative Ras/Raf epistasis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis plus co-IP with chimeric receptors, single lab\",\n      \"pmids\": [\"9528800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Shc mediates random (non-directional) cell motility downstream of integrins via the MAP kinase pathway. PTEN directly dephosphorylates Shc, downregulating Shc-driven MAP kinase activation and migration. This Shc/MEK1 pathway is additive to a separate FAK/p130Cas pathway regulating directional migration.\",\n      \"method\": \"Overexpression of dominant-negative Shc, constitutively active MEK1, PTEN reconstitution, in vitro PTEN phosphatase assay on Shc, cell migration assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro phosphatase assay demonstrating PTEN acts on Shc + dominant-negative and overexpression functional assays, single lab\",\n      \"pmids\": [\"10427092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"ShcA associates with SHIP (SH2-containing inositol phosphatase) via the ShcA PTB domain following FLT3 activation. ShcA is phosphorylated at Tyr239/240 and Tyr313 by FLT3; Shc overexpression increases SHIP tyrosine phosphorylation (requiring functional PTB domain) and limits FLT3-dependent cell growth (requiring Tyr313).\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis (Y→F substitutions), overexpression studies, cell growth assays\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP + mutagenesis defining phosphorylation sites and PTB-domain requirement, single lab\",\n      \"pmids\": [\"10482988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The Shc SH2 domain binds the phosphorylated novel protein PAL (Protein expressed in Activated Lymphocytes) in a phosphotyrosine-independent manner, identifying a non-canonical interaction mode for the Shc SH2 domain. PAL expression is restricted to proliferating cells and is growth-factor inducible.\",\n      \"method\": \"Yeast two-hybrid, domain mapping with Shc mutants\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single yeast two-hybrid result, no in-cell validation of phosphotyrosine-independent binding\",\n      \"pmids\": [\"10086341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Shc differentially regulates cell migration vs. proliferation depending on growth factor availability: under growth-factor-limiting conditions the PTB domain drives haptotactic migration, whereas when growth factors are present the SH2 domain is selectively required for DNA synthesis.\",\n      \"method\": \"Mutational analysis of Shc PTB and SH2 domains, migration and proliferation assays under varied growth factor conditions\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific mutagenesis with two distinct functional readouts, single lab\",\n      \"pmids\": [\"10613912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"ShcA sensitizes cells to growth factor-induced MAP kinase activation and organizes cytoskeletal rearrangement in response to extracellular matrix. ShcA-null mouse embryos exhibit cardiovascular defects (heart development and blood vessel remodeling defects), with MAP kinase pathway selectively impaired. The PTB and SH2 domains of ShcA mediate these functions.\",\n      \"method\": \"Targeted mutation/knockout of ShcA in mice, biochemical analysis of mutant cells, MAPK activation assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic knockout with biochemical pathway analysis confirming mechanism\",\n      \"pmids\": [\"10809671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Shc activates the PI3K/Akt pathway via a Shc→Grb2→Gab2→PI3K cascade downstream of cytokine receptors (IL-3 betac, IL-2Rbeta) that lack direct p85-binding sites. Y577 (Shc binding site on betac) is the major site required for Gab2 phosphorylation. Fusion of Shc directly to mutant IL-2Rbeta demonstrates Shc is sufficient to evoke Gab2 phosphorylation; mutation of the three Shc pYXN/Grb2-binding tyrosines abolishes this.\",\n      \"method\": \"Y→F mutant and 'add-back' receptor mutants, chimeric receptors, Grb2 SH2/SH3 dominant-negative mutants, Gab2 PI3K-binding mutants, Akt activation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — chimeric receptor reconstitution + multiple epistatic mutants establishing pathway order\",\n      \"pmids\": [\"10982827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Shc and FAK activate ERK independently and in parallel downstream of integrins. Cytochalasin D abolishes FAK but not Shc signaling to ERK. Targeted deletion of the beta1 cytoplasmic domain segment required for FAK activation does not impair Shc tyrosine phosphorylation or ERK activation. Dominant-negative studies show Shc mediates the early/peak phase and FAK/p130CAS/Crk/Rap1 mediate the late phase of ERK activation.\",\n      \"method\": \"Cytochalasin D treatment, targeted beta1 integrin cytoplasmic domain deletion in primary fibroblasts, dominant-negative constructs, ERK activation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic deletion + pharmacological dissection + dominant-negatives with temporal pathway resolution\",\n      \"pmids\": [\"10976102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"EPO-induced Shc phosphorylation occurs via direct Shc SH2 domain association with JAK2 rather than requiring receptor cytoplasmic phosphotyrosines; a mitogenically deficient EPOR lacking all cytoplasmic tyrosines still supports Shc-JAK2 association and Shc phosphorylation in vitro.\",\n      \"method\": \"Co-immunoprecipitation of Shc and JAK2, in vitro cytokine-induced Shc phosphorylation assay, receptor mutants lacking tyrosines\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro assay + receptor mutant co-IP establishing phosphotyrosine-independent JAK2 association, single lab\",\n      \"pmids\": [\"7538110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"TrkB-mediated neuronal survival and axon growth are both dependent on the Shc binding site of TrkB, operating through PI3K and MEK pathways. TrkB mutated at the Shc site poorly supports survival and growth relative to wild-type TrkB; TrkB mutated at the PLC-gamma1 site supports both.\",\n      \"method\": \"TrkB site-directed mutants expressed in primary sympathetic neurons, PI3K and MEK inhibitor studies, survival and axon growth readouts\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mutagenesis + inhibitor epistasis in primary neurons with defined functional readouts\",\n      \"pmids\": [\"10985347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"In EGF-stimulated A431 cells, all three ShcA isoforms (P46, P52, P66) translocate from cytoplasm to plasma membrane within 5 min and then redistribute to cytoplasmic vesicle structures co-localizing with EGF receptor and activated c-Src. P52 and P66 (but not P46) augment EGFR-Src complex formation and c-Src activation.\",\n      \"method\": \"GFP-Shc live imaging, indirect immunofluorescence, co-immunoprecipitation, synthetic peptide competition\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell imaging + co-IP with isoform specificity, single lab\",\n      \"pmids\": [\"10971656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ShcA expression in neural stem/progenitor cells promotes proliferation via Ras/MAPK and is downregulated as cells differentiate, whereupon ShcC takes over to support viability and neuronal maturation via PI3K-Akt-Bad pathway and persistent MAPK activation. The switch from ShcA to ShcC changes responsiveness from proliferative to survival/differentiation signaling.\",\n      \"method\": \"ShcC expression analysis, overexpression and functional assays in differentiating neural progenitor cells, PI3K/Akt pathway analysis\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional overexpression plus pathway analysis in primary cells, single lab\",\n      \"pmids\": [\"11369938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Shc p66 and p52 isoforms (but not p46) directly activate c-Src in an isoform-specific manner. Shc-c-Src interaction and c-Src autophosphorylation (activation segment) are demonstrated in vitro and in vivo. A Shc point mutant abolishing c-Src activation identified the interaction site. Shc-mediated c-Src activation triggers the Stat-p21/WAF1 pathway leading to cell cycle arrest.\",\n      \"method\": \"In vitro c-Src activation assay, co-immunoprecipitation, Shc point mutant that abolishes c-Src activation, isoform-specific analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase activation assay + mutagenesis defining interaction sites + downstream pathway, single lab\",\n      \"pmids\": [\"12048194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Serine phosphorylation of ShcA (Ser29 in p52; Ser138 in p66) by PKC isoforms (alpha, epsilon, delta) is required together with an intact PTB domain for ShcA binding to PTP-PEST. A PTP-PEST-binding-defective S29A ShcA mutant shows enhanced insulin-induced ERK activation and increased tyrosine phosphorylation, indicating PTP-PEST dephosphorylates ShcA to attenuate insulin signaling.\",\n      \"method\": \"Phosphorylation site mapping (mass spectrometry), PKC inhibitor and constitutively active PKC constructs, S29A/S138A mutants, co-immunoprecipitation, ERK activation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — phosphosite mapping + mutagenesis + functional consequence demonstrating PTM-dependent interaction, single lab\",\n      \"pmids\": [\"12052829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ShcA (Shc) is essential for pre-TCR signaling in thymic T cell development: both inducible expression of phosphorylation-defective ShcA (dominant-negative) and conditional Shc locus deletion in thymocytes impaired pre-TCR signaling, proliferation, and differentiation at the same developmental stage.\",\n      \"method\": \"Cre-loxP conditional knockout, dominant-negative ShcA transgenic mice, T cell development stage analysis\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent genetic approaches (DN transgene + conditional KO) converging on same phenotype\",\n      \"pmids\": [\"12101399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ShcA is required for TCR-induced activation of c-Rel and IL-2 expression, but is dispensable for CD69/CD25 expression and NFAT activation. In Shc-deficient Jurkat cells, MAP kinase activation was impaired; rescue by exogenous Shc or c-Rel-ER fusion confirmed the pathway order: Shc → MAPK → c-Rel → IL-2.\",\n      \"method\": \"Shc-deficient Jurkat mutant cells, complementation with exogenous Shc, c-Rel-ER epistasis construct, reporter assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function + complementation + epistasis construct establishing pathway order\",\n      \"pmids\": [\"11917142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"DDR2 receptor tyrosine kinase requires Src activity for maximal tyrosine phosphorylation; Src promotes DDR2 association with Shc via a portion of Shc not previously implicated in RTK interactions. Src is required for DDR2-mediated MMP-2 promoter transactivation.\",\n      \"method\": \"Co-immunoprecipitation, Src kinase inhibition/knockdown, MMP-2 reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP + functional readout, single lab\",\n      \"pmids\": [\"11884411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"E2 (estrogen) rapidly induces Shc phosphorylation and Shc-Grb2-Sos complex formation in MCF-7 cells. ERalpha and Src act upstream of Shc. Direct physical association between ERalpha and Shc is demonstrated by GST-Shc pulldown; the ShcA PTB and SH2 domains are required to interact with the ERalpha AF-1 domain. Dominant-negative Shc blocks E2-induced MAPK activation.\",\n      \"method\": \"GST-Shc pulldown, co-immunoprecipitation, Shc domain mutagenesis, dominant-negative Shc, inhibitor studies, confocal microscopy\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro pulldown + domain mutagenesis + dominant-negative functional assay, single lab\",\n      \"pmids\": [\"11773443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Upon TGF-beta stimulation, the activated TGF-beta type I receptor (TbetaRI) directly recruits and phosphorylates ShcA on both tyrosine and serine residues, using an intrinsic TbetaRI tyrosine kinase activity (dual-specificity kinase). ShcA phosphorylation induces ShcA-Grb2-Sos association, activating the Erk MAP kinase pathway independently of Smad signaling.\",\n      \"method\": \"In vitro TbetaRI kinase assays, tyrosine kinase-dead and serine-kinase-dead TbetaRI mutants, co-immunoprecipitation, Erk phosphorylation assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay + receptor mutagenesis + multiple orthogonal methods, widely cited\",\n      \"pmids\": [\"17673906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ShcA signals through combinatorial PTB-, SH2-, and pYXN-dependent interactions for distinct developmental functions: cardiomyocyte ShcA requires PTB but not pYXN motifs for mid-gestational heart development, whereas muscle spindle formation requires both pYXN and PTB/SH2 on the same ShcA molecule.\",\n      \"method\": \"Knock-in mice with domain-specific ShcA mutations (PTB-dead, pYXN mutants, combined mutants), histological and functional analysis of heart and muscle spindles\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple knock-in genetic models distinguishing domain requirements in vivo\",\n      \"pmids\": [\"17626887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"All three ShcA tyrosine phosphorylation sites (Y239/240, Y313) are involved in early mammary tumor progression. Y313-derived signals are important for tumor cell survival, whereas Y239/240 transduce signals promoting tumor vascularization. Loss of ShcA expression in mammary epithelial cells abrogates tumor development.\",\n      \"method\": \"Phosphotyrosine-deficient ShcA knock-in mice under endogenous promoter, mammary tumor progression analysis, histological and biochemical readouts\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knock-in genetics with site-specific pY mutations, distinct biological readouts per site\",\n      \"pmids\": [\"18273058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In endothelial cells exposed to flow, Shc is activated and associates with cell-cell (VE-cadherin) and cell-matrix (integrin) adhesions. Shc activation requires VEGFR2 and Src tyrosine kinases. Shc-VE-cadherin association is matrix-independent; Shc-integrin binding requires VE-cadherin. Shc silencing reduces NF-kappaB-dependent inflammatory signaling and Shc is activated in atherosclerosis-prone arterial regions in vivo.\",\n      \"method\": \"Co-immunoprecipitation under flow conditions, siRNA knockdown, NF-kappaB reporter assay, in vivo arterial Shc activation analysis, dominant-negative Src/VEGFR2\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP + siRNA + in vivo confirmation with mechanistic pathway dissection\",\n      \"pmids\": [\"18606845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"14-3-3zeta is phosphorylated on Tyr179 in response to GM-CSF and binds the ShcA SH2 domain, assembling a 14-3-3:Shc scaffold that recruits PI3K to regulate Akt activation and cell survival. Y179F 14-3-3 fails to support Akt phosphorylation and viability in primary mast cells reconstituted with this mutant.\",\n      \"method\": \"Co-immunoprecipitation, 14-3-3zeta KO bone marrow mast cell reconstitution with WT vs. Y179F 14-3-3, Akt activation and viability assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic reconstitution in primary KO cells + co-IP + functional mutation, single lab\",\n      \"pmids\": [\"19218246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The ShcA PTB domain directly interacts with a helical fragment from the IQGAP1 N-terminal region in a pTyr-independent, non-canonical manner (characterized by NMR). ShcA and IQGAP1 co-precipitate and are co-recruited to membrane ruffles induced by ErbB receptor activation. ShcA knockdown inhibits lamellipodia formation. ShcA PTB binding to IQGAP1 is mutually exclusive with binding to PTP-PEST peptide.\",\n      \"method\": \"NMR structural characterization, mass spectrometry, co-immunoprecipitation, siRNA knockdown, live-cell imaging of membrane ruffles\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structural validation of direct interaction + co-IP + functional knockdown with multiple orthogonal methods\",\n      \"pmids\": [\"20075861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"p66(Shc) acts as a focal-adhesion-associated reporter of cell attachment. p66(Shc)-null cells show unrestrained Ras activation upon detachment, blocking anoikis. Re-expression of p66(Shc) in metastatic cells (which lack both p66Shc and pRB) restores anoikis and suppresses metastasis in vivo. p66(Shc) coordinates Ras-dependent control of proliferation and anchorage.\",\n      \"method\": \"Re-expression of p66(Shc) in p66-null metastatic cells, Ras activity assays, anoikis assays, in vivo metastasis models, p66(Shc) and pRB knockdown\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic re-expression + in vivo metastasis model + molecular pathway analysis, single lab\",\n      \"pmids\": [\"20676142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LRP1 forms a complex with the IGF-1 receptor and is required for ShcA tyrosine phosphorylation and membrane translocation in response to IGF-1. ShcA presence directs IGF-1 signaling toward Ras/MAP kinase; in the absence of ShcA, IGF-1 signaling bifurcates to Akt/mTOR, accelerating adipocyte differentiation.\",\n      \"method\": \"Co-immunoprecipitation, LRP1/ShcA siRNA knockdown, membrane fractionation, Ras/MAPK and Akt/mTOR activation assays, adipogenesis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA knockdown of both components + pathway bifurcation demonstrated with multiple readouts, single lab\",\n      \"pmids\": [\"21454706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Shc1 responds to EGF stimulation through multiple sequential phosphorylation events and protein interactions: an initial wave recruits Grb2 to Shc1 pTyr sites, activating pro-mitogenic/survival pathways; Akt-mediated feedback then phosphorylates Shc1 Ser29, recruiting the Ptpn12 tyrosine phosphatase; Ptpn12 then acts as a switch converting Shc1 from pTyr/Grb2-based signaling to SgK269-mediated cytoskeletal/trafficking pathways regulating cell invasion.\",\n      \"method\": \"Quantitative mass spectrometry of Shc1 complexes over time, phosphomutant analysis, Ptpn12 co-IP, cell invasion and morphogenesis assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative MS with temporal resolution + mutagenesis + multiple functional readouts, single lab with extensive orthogonal methods\",\n      \"pmids\": [\"23846654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"p52ShcA competes with Smad3 for TGF-beta receptor binding, sequesters TGF-beta receptor complexes to caveolin-associated membrane compartments (preventing clathrin-dependent Smad activation), and thereby protects epithelial cells from TGF-beta-induced EMT. ShcA knockdown enhances receptor localization in clathrin compartments, increases Smad3 activation, and induces EMT with increased migration, invasion, and stem cell generation.\",\n      \"method\": \"Co-immunoprecipitation, compartment fractionation (caveolin vs. clathrin), ShcA siRNA knockdown, Smad3 activation assays, EMT and invasion assays, mammosphere formation\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — receptor competition assay + compartmentalization fractionation + siRNA with multiple functional readouts, single lab\",\n      \"pmids\": [\"26680585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DDR1b-mediated collagen I-induced N-cadherin upregulation requires Shc1 binding to DDR1b Tyr513 via its PTB domain. The signaling does not require the Shc1 SH2 domain or pY239/240/313 but requires a segment of the Shc1 central domain interacting with the proline-rich region of Pyk2, positioning Shc1 as a scaffold coupling DDR1b and Pyk2.\",\n      \"method\": \"Shc1 knockdown, PTB-domain mutants, SH2-domain mutants, pY mutants, Y513F DDR1b mutant, domain-specific interaction assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic mutagenesis of both receptor and adaptor domains identifying non-canonical interaction, single lab\",\n      \"pmids\": [\"27605668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ShcA simultaneously activates STAT3 immunosuppressive signals and impairs STAT1-driven immune surveillance in breast cancer cells. Impaired Y239/Y240-ShcA phosphorylation selectively reduces STAT3 activation in tumors, sensitizing them to immune checkpoint inhibitors.\",\n      \"method\": \"pY-deficient ShcA knock-in mouse models, STAT3 and STAT1 activation assays, immune checkpoint immunotherapy experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — site-specific knock-in genetics + multiple downstream pathway analysis + functional immunotherapy readouts\",\n      \"pmids\": [\"28276425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ShcA associates with nephrin (a podocyte slit diaphragm protein) via its SH2 domain binding to multiple phosphorylated tyrosine residues on nephrin. ShcA overexpression promotes nephrin tyrosine phosphorylation, reduces nephrin cell-surface expression, and decreases nephrin signaling. In a rat injury model, phospho-nephrin colocalizes with endocytic structures coincident with ShcA upregulation.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, ShcA overexpression, in vivo biotinylation assay for surface vs. cytosolic nephrin, rat injury model\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP + in vitro pulldown + in vivo surface expression assay + disease model, single lab\",\n      \"pmids\": [\"29018139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In endothelial cells, SHC1 recruits the PP2A scaffolding subunit to the proline-rich apoER2 C-terminus along with two distinct PP2A regulatory subunits in response to antiphospholipid antibodies (aPL), enabling inhibitory dephosphorylation of Akt and eNOS and promoting thrombosis. This was demonstrated by aPL-induced assembly of the apoER2/Dab2/SHC1/PP2A complex.\",\n      \"method\": \"Co-immunoprecipitation of apoER2-Dab2-SHC1-PP2A complex, SHC1 knockdown, Akt and eNOS phosphorylation assays, in vivo thrombosis model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — complex assembly co-IP + in vivo mouse model + multiple phosphorylation readouts, single lab\",\n      \"pmids\": [\"29500169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Genetic ablation of the p52SHC isoform (but not p66SHC) significantly attenuates DMBA-induced mammary tumor formation in rats, identifying p52SHC as the oncogenic isoform driving breast cancer initiation. p52SHC KO disrupted ESR1 and mTORC2/RICTOR pathway gene networks.\",\n      \"method\": \"Germline isoform-specific p52SHC and p66SHC knockout rats, DMBA mammary tumor induction model, RNA-seq, gene network analysis\",\n      \"journal\": \"Breast cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — first isoform-specific KO in vivo model, direct comparison between p52 and p66 KOs\",\n      \"pmids\": [\"31202267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Endothelial Shc acts downstream of the mechanoreceptor Alk5 to mediate shear-stress-induced endothelial-to-mesenchymal transition (EndMT) and atherosclerosis. Genetic targeting of endothelial Shc reduces EndMT and atherosclerosis in areas of disturbed flow. Alk5-mediated mechanosensing drives Shc activation independently of other mechanosensors.\",\n      \"method\": \"Endothelial-specific Shc genetic targeting (in vivo), Alk5 depletion, reconstitution experiments with tensional force, atherosclerosis model\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo endothelial-specific genetic targeting + reconstitution experiments establishing Alk5-Shc mechanosensory axis\",\n      \"pmids\": [\"34244146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ShcA (via its SH2 domain) binds Tyr1101 of the Tie2 receptor following angiopoietin-1 stimulation, leading to Shc phosphorylation. Dominant-negative ShcA impairs angiopoietin-1-induced endothelial chemotaxis and sprouting (but not survival) and partially reduces PI3K p85 tyrosine phosphorylation.\",\n      \"method\": \"In vitro co-immunoprecipitation, pulldown with Tie2 phosphopeptides, overexpression of dominant-negative ShcA, chemotaxis and sprouting assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP + dominant-negative functional assay + specific Tyr mapping, single lab\",\n      \"pmids\": [\"14665640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Chlamydia trachomatis effector protein Tarp interacts with SHC1 as one of its strongest binding partners (demonstrated by phosphopeptide-SH2/PTB domain protein array). SHC1 knockdown in C. trachomatis-infected cells sensitizes them to TNF-induced apoptosis, identifying SHC1-dependent regulation of apoptosis-related genes as important for early chlamydial infection survival.\",\n      \"method\": \"Protein microarray of all human SH2/PTB domains, quantitative binding measurements, SHC1 siRNA knockdown, apoptosis assay, transcriptome analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — comprehensive domain array + siRNA functional validation, single lab\",\n      \"pmids\": [\"20624904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"p66(Shc) is phosphorylated at Ser36 in response to pathological cyclic stretch in endothelial cells, downstream of integrin alpha5beta1 and c-Jun N-terminal kinase. This phosphorylation activates NADPH oxidase, increases ROS production, and reduces nitric oxide bioavailability. Silencing p66(Shc) blunts these stretch-induced effects.\",\n      \"method\": \"Cyclic stretch of primary human aortic endothelial cells, integrin inhibition, JNK inhibition, p66(Shc) siRNA knockdown, ROS and NADPH oxidase assays, NO bioavailability measurements\",\n      \"journal\": \"Hypertension\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pharmacological pathway dissection + siRNA + multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"24842918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Idebenone physically binds Shc protein (p52 isoform) and inhibits Shc's competition with IRS1 downstream of the insulin receptor. Genetic depletion of Shc's target eliminates idebenone's ability to insulin-sensitize in vivo. Multiple target-engagement assays confirm direct idebenone-Shc binding.\",\n      \"method\": \"In vitro Shc binding assays (multiple orthogonal assays), p52Shc genetic depletion in mice, insulin sensitivity assays (two mouse models), drug screening of 1680 compounds\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding assays + in vivo genetic validation of target specificity, single lab with multiple methods\",\n      \"pmids\": [\"30290222\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SHC1 (ShcA) is a modular phosphotyrosine adaptor protein that couples activated receptor tyrosine kinases, cytokine receptors, integrins, G-protein-coupled receptors, and mechanosensors to downstream signaling cascades—primarily Ras/MAPK and PI3K/Akt—by recruiting Grb2-Sos complexes to its pY239/240 and pY313 sites after PTB- or SH2-domain-mediated docking on activated receptors; it also regulates cytoskeletal organization via non-canonical PTB-domain interactions with IQGAP1, controls receptor compartmentalization (caveolin vs. clathrin) to modulate Smad vs. Erk signaling, acts as a temporal scaffold that undergoes Akt-mediated Ser29 feedback phosphorylation to recruit Ptpn12 and switch signaling outputs, and, through its p66 isoform, functions as a mitochondrial redox enzyme that generates ROS, promotes apoptosis, and suppresses Ras hyperactivation to regulate anoikis, lifespan, and metabolic/vascular stress responses.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SHC1 (ShcA) is a modular phosphotyrosine adaptor that couples activated receptors—receptor tyrosine kinases, cytokine receptors, integrins, G-protein-coupled receptors, and mechanosensors—to downstream Ras/MAPK and PI3K/Akt signaling [#0, #20, #21]. It docks on activated receptors through two phosphotyrosine-reading modules: an SH2 domain that binds autophosphorylated receptors such as the PDGF beta-receptor and the EGF receptor [#0, #1], and a PTB domain that engages high-affinity sites such as Ret/ptc2 Tyr586 [#12]. Receptor-induced phosphorylation of ShcA at Tyr239/240 and Tyr313 creates pYXN motifs that recruit Grb2-Sos, amplifying Ras activation [#3, #17, #21], and site-specific knock-in studies show these tyrosines partition distinct outputs, with Y313 driving tumor cell survival and Y239/240 driving vascularization and STAT3 immunosuppressive signaling [#35, #44]. ShcA also reads cytokine receptors indirectly by binding JAK2 directly through its SH2 domain (growth hormone, IL-6, erythropoietin receptors), feeding the same Grb2/Ras axis [#6, #11, #23], and routes PI3K/Akt activation via a Shc→Grb2→Gab2→PI3K cascade and a 14-3-3:Shc scaffold [#21, #37]. Beyond canonical pY signaling, the PTB domain mediates non-canonical, phosphotyrosine-independent interactions with IQGAP1 to drive lamellipodia and membrane ruffling [#38], and ShcA acts as a temporal scaffold whose Akt-mediated Ser29 feedback phosphorylation recruits the phosphatase Ptpn12 (and PTP-PEST) to switch outputs from Grb2-based mitogenic signaling toward cytoskeletal/trafficking pathways [#28, #41]. ShcA controls receptor compartmentalization, sequestering TGF-beta receptors to caveolin compartments to suppress Smad-driven EMT while enabling Erk signaling [#33, #42]. Through its p66 isoform, ShcA reports cell attachment at focal adhesions to restrain Ras and enforce anoikis, and generates ROS via NADPH oxidase under mechanical stretch to regulate vascular stress responses [#39, #51]. Genetically, ShcA is required in vivo for cardiovascular development, pre-TCR and TCR signaling in T cells, neuronal survival, and mammary tumorigenesis, with the p52 isoform identified as the oncogenic driver of breast cancer initiation [#20, #29, #30, #24, #47].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established that ShcA is a direct phosphotyrosine adaptor for activated receptor tyrosine kinases, defining how it physically engages receptors and links them to Grb2/Ras.\",\n      \"evidence\": \"GST-SH2 pulldown with purified PDGF beta-receptor plus mutagenesis, and in vivo EGFR co-IP with subcellular fractionation\",\n      \"pmids\": [\"8195171\", \"7925272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether receptor-specific compartmentalization (endosomal vs. plasma membrane) is general across all RTKs was not resolved\", \"The functional consequence of isoform-preferential phosphorylation was not yet established\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Defined the pYXN/Grb2-recruitment logic and showed ShcA integrates non-RTK inputs (GPCR Gβγ, JAK2 from cytokine receptors), establishing it as a convergence node for diverse upstream signals.\",\n      \"evidence\": \"BIAcore binding of Tyr317-phosphorylated Shc to Grb2 with functional migration readout; co-IP and pharmacological dissection of Gβγ- and JAK2-driven Shc phosphorylation\",\n      \"pmids\": [\"7731718\", \"7568118\", \"7535773\", \"7544794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SH2 vs. PTB docking dominates was receptor-dependent and not unified\", \"In vivo relevance of GPCR-to-Shc coupling not tested genetically\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Showed ShcA couples integrins, not just soluble growth factors, to MAPK and cell-cycle progression, and identified phosphotyrosine-independent interactions (adaptins) that hint at trafficking roles.\",\n      \"evidence\": \"Dominant-negative Shc, integrin alpha-subunit domain swaps and co-IP; GST-Shc affinity chromatography mapping adaptin binding to the CH1 region\",\n      \"pmids\": [\"8929541\", \"8617812\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The mechanism linking caveolin to integrin-Shc recruitment was not molecularly resolved\", \"Functional consequence of Shc-adaptin binding for endocytosis untested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Distinguished the high-affinity PTB-domain docking mode from SH2 docking and extended Shc engagement to cytokine receptors and adhesion molecules, clarifying domain-specific receptor selection.\",\n      \"evidence\": \"In vitro PTB vs. SH2 binding to Ret/ptc2 with Y586F mutagenesis; gp130/Jak2 domain-specific co-IP; cadherin SH2 binding by yeast two-hybrid and in vitro pulldown\",\n      \"pmids\": [\"9047384\", \"9126968\", \"9153187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PTB and SH2 occupancy is simultaneous or competitive on a given receptor not addressed\", \"Physiological output of cadherin-Shc binding not defined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Provided in vivo genetic proof that Shc recruitment is required for tumor progression and that PTB-mediated docking can require accessory localization factors.\",\n      \"evidence\": \"Transgenic PyV MT Shc-binding-site mutants with biochemical reversion analysis; chimeric Ret/ptc2 receptors with Enigma co-localization and Ras/Raf epistasis\",\n      \"pmids\": [\"9528804\", \"9528800\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which downstream Shc effector (Ras vs. PI3K) drives metastasis was not isolated here\", \"Generality of localization-dependent PTB signaling beyond Ret unknown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Resolved that ShcA bidirectionally regulates migration vs. proliferation through distinct domains and is counter-regulated by phosphatases, establishing it as a tunable signaling switch.\",\n      \"evidence\": \"Domain-specific Shc mutants in migration/proliferation assays; in vitro PTEN phosphatase assay on Shc and SHIP co-IP via PTB domain\",\n      \"pmids\": [\"10613912\", \"10427092\", \"10482988\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The PAL SH2 interaction rests on a single yeast two-hybrid result without in-cell validation (#18)\", \"Direct phosphatase competition with kinase input not quantified in vivo\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Genetic knockout and pathway reconstitution established ShcA's essential developmental role and ordered the Shc→Grb2→Gab2→PI3K/Akt cascade alongside parallel ERK pathways.\",\n      \"evidence\": \"ShcA-null mice with cardiovascular defects and MAPK analysis; chimeric cytokine-receptor reconstitution defining Gab2/PI3K pathway order; parallel Shc vs. FAK ERK dissection\",\n      \"pmids\": [\"10809671\", \"10982827\", \"10976102\", \"10985347\", \"7538110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Shc selects between Ras/MAPK and PI3K/Akt outputs was not mechanistically resolved\", \"Tissue-specific domain requirements not yet dissected\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Established isoform-specific c-Src activation and PTM-dependent phosphatase recruitment, and demonstrated ShcA's requirement in T-cell development and TCR signaling order.\",\n      \"evidence\": \"In vitro c-Src activation assay with Shc point mutants; Ser29/Ser138 phosphosite mapping with S29A mutants and PTP-PEST co-IP; conditional Shc KO and dominant-negative thymocytes; Shc-deficient Jurkat complementation defining Shc→MAPK→c-Rel→IL-2\",\n      \"pmids\": [\"12048194\", \"12052829\", \"12101399\", \"11917142\", \"11884411\", \"11773443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The full set of serine kinases controlling PTP-PEST recruitment in distinct receptor contexts not enumerated\", \"Isoform-specific c-Src activation mechanism structurally undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed that ShcA carries non-canonical signaling, being directly phosphorylated by the TGF-beta receptor (a dual-specificity kinase) and using combinatorial domain requirements for distinct developmental programs.\",\n      \"evidence\": \"In vitro TbetaRI kinase assays with kinase-dead mutants and Erk readouts; domain-specific knock-in mice (PTB-dead, pYXN mutants) for heart and muscle spindle phenotypes\",\n      \"pmids\": [\"17673906\", \"17626887\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single receptor selects ShcA-Erk vs. Smad outputs was not yet defined\", \"Structural basis for combinatorial PTB/SH2/pYXN cooperation not determined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Site-specific knock-in genetics partitioned ShcA tyrosine outputs into discrete biological functions (survival vs. vascularization), explaining how one adaptor produces divergent tumor phenotypes.\",\n      \"evidence\": \"Endogenous-promoter pY-deficient ShcA knock-in mice with mammary tumor progression analysis\",\n      \"pmids\": [\"18273058\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The distinct effector complexes assembled at Y313 vs. Y239/240 were not biochemically separated here\", \"Quantitative contribution of each site to overall tumor burden not isolated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined ShcA's non-canonical PTB-IQGAP1 cytoskeletal axis structurally and established p66Shc as a focal-adhesion attachment reporter controlling anoikis and metastasis.\",\n      \"evidence\": \"NMR characterization of PTB-IQGAP1 binding with siRNA lamellipodia assays; p66Shc re-expression in null metastatic cells with Ras activity and in vivo metastasis assays\",\n      \"pmids\": [\"20075861\", \"20676142\", \"20624904\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PTB switches between IQGAP1, PTP-PEST and receptor ligands in cells not temporally resolved\", \"Molecular basis of p66Shc Ras suppression at focal adhesions not fully defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Quantitative temporal proteomics established ShcA as a dynamic scaffold whose Akt-driven Ser29 feedback phosphorylation recruits Ptpn12 to switch outputs from Grb2-mitogenic to cytoskeletal/trafficking signaling.\",\n      \"evidence\": \"Time-resolved quantitative mass spectrometry of Shc1 complexes after EGF, phosphomutant analysis, Ptpn12 co-IP and invasion assays\",\n      \"pmids\": [\"23846654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The full SgK269-mediated effector branch downstream of the switch is not detailed\", \"Whether the same temporal switch operates at non-EGFR receptors untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed ShcA controls signaling outcome by physically directing receptor compartmentalization, sequestering TGF-beta receptors to caveolin compartments to suppress Smad-driven EMT.\",\n      \"evidence\": \"Receptor competition co-IP, caveolin vs. clathrin fractionation, ShcA siRNA with EMT, invasion and mammosphere assays\",\n      \"pmids\": [\"26680585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The structural determinant routing receptors to caveolin vs. clathrin not mapped\", \"Whether this compartmentalization mechanism generalizes to other receptor families unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended ShcA function to immune evasion and adhesion-receptor scaffolding, and to slit-diaphragm regulation, broadening its roles beyond mitogenic signaling.\",\n      \"evidence\": \"pY-deficient knock-in mice linking Y239/240 to STAT3/STAT1 balance and checkpoint sensitivity; DDR1b Y513 PTB-domain coupling to Pyk2; nephrin SH2 binding with in vivo surface-expression assays\",\n      \"pmids\": [\"28276425\", \"27605668\", \"29018139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Y239/240-Shc selectively activates STAT3 not biochemically resolved\", \"Direct kinase-substrate relationships in the nephrin endocytosis pathway not fully defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established ShcA as a mechanotransduction node in the endothelium, acting downstream of receptors and mechanosensors to drive vascular pathology, and identified isoform- and drug-level specificity.\",\n      \"evidence\": \"Endothelial-specific Shc genetic targeting and Alk5 reconstitution in atherosclerosis models; flow- and stretch-induced Shc/p66Shc pathway dissection; isoform-specific p52/p66 KO rats; idebenone-Shc direct binding with genetic target validation\",\n      \"pmids\": [\"34244146\", \"18606845\", \"24842918\", \"31202267\", \"30290222\", \"29500169\", \"14665640\", \"21454706\", \"11369938\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How distinct mechanosensors converge on a common Shc activation step is not unified\", \"Structural basis for p52 vs. p66 functional divergence remains undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ShcA integrates its many domain-specific, isoform-specific, and PTM-gated interactions into a single decision-making logic that selects among Ras/MAPK, PI3K/Akt, cytoskeletal, redox, and compartmentalization outputs in a given cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unified structural/quantitative model predicting output selection from input identity\", \"The full p66Shc mitochondrial redox mechanism is not represented mechanistically in this corpus\", \"Interplay between competing PTB ligands (IQGAP1, PTP-PEST, receptors) in vivo not quantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 3, 21, 38, 41]},\n      {\"term_id\": \"GO:0005515\", \"supporting_discovery_ids\": [0, 12, 38]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 25]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [25, 40]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 3, 21, 33]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [14, 35, 47, 48]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [29, 30, 44]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [9, 22]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [20, 24, 34]}\n    ],\n    \"complexes\": [\n      \"Shc-Grb2-Sos complex\",\n      \"apoER2/Dab2/SHC1/PP2A complex\"\n    ],\n    \"partners\": [\n      \"GRB2\",\n      \"JAK2\",\n      \"SRC\",\n      \"IQGAP1\",\n      \"PTPN12\",\n      \"GAB2\",\n      \"YWHAZ\",\n      \"PTPN12/PTP-PEST\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}