{"gene":"FYB1","run_date":"2026-04-28T17:46:04","timeline":{"discoveries":[{"year":1997,"finding":"FYB (p120/130) was cloned as a hematopoietic-specific adapter that associates with the Src kinase p59(Fyn) via direct binding, associates with SLP-76 via the SLP-76 SH2 domain, is tyrosine-phosphorylated upon TCR/CD3 ligation, and augments IL-2 secretion from T cell hybridomas in response to TCR stimulation.","method":"cDNA cloning, co-immunoprecipitation, yeast two-hybrid, overexpression in T cell hybridoma with IL-2 readout","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP and functional overexpression, foundational cloning paper, replicated by multiple subsequent labs","pmids":["9207119"],"is_preprint":false},{"year":1997,"finding":"SLAP-130 (FYB) was cloned as a SLP-76-associated phosphoprotein that binds the SH2 domain of SLP-76, is a substrate of TCR-induced protein tyrosine kinases, and when overexpressed diminishes TCR-induced IL-2 promoter activity and interferes with SLP-76 augmentation of IL-2 promoter activity, suggesting it acts as a negative regulator recruited by SLP-76.","method":"Molecular cloning, co-immunoprecipitation with SLP-76 SH2 domain, co-transfection/reporter assay in Jurkat cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (cloning, binding assay, functional reporter), foundational paper replicated by others","pmids":["9115214"],"is_preprint":false},{"year":1998,"finding":"FYB binds SKAP55 and SKAP55R through the SH3 domains of those proteins interacting with proline-rich sequences in FYB; FYB and SKAP55 colocalize in the perinuclear region; both SKAP55 and SKAP55R are FYN kinase substrates in T cells.","method":"Yeast two-hybrid screen with FYB as bait, co-immunoprecipitation in T cells, confocal immunofluorescence microscopy","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — yeast two-hybrid plus reciprocal co-IP plus imaging, replicated in subsequent work","pmids":["9671755"],"is_preprint":false},{"year":1998,"finding":"SLAP-130 (FYB) directly associates with SKAP55 via the SH3 domain of SKAP55 binding a proline-rich sequence of SLAP-130; both proteins are components of the Fyn complex in human T cells.","method":"Co-immunoprecipitation in COS cells and human T cells, co-transfection of truncation mutants, yeast two-hybrid","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — direct binding confirmed by domain-mapping mutagenesis and yeast two-hybrid, consistent with PMID 9671755","pmids":["9748251"],"is_preprint":false},{"year":1999,"finding":"FYN-T selectively phosphorylates FYB, creating docking sites for FYN-T and SLP-76 SH2 domains; co-expression of all three components (FYN-T, FYB, SLP-76) synergistically up-regulates TCR-driven IL-2 transcription; FYB phosphorylation shows distinct cytoplasmic localization and long-term stable kinetics.","method":"In vitro kinase assay with FYN-T, co-immunoprecipitation, co-transfection/IL-2 promoter luciferase reporter assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — in vitro kinase assay plus functional co-expression reporter, replicated by PMID 10570256","pmids":["10409671"],"is_preprint":false},{"year":1999,"finding":"Tyrosines Tyr595 and Tyr651 of FYB are the major FYN-T phosphorylation sites that mediate binding to the SLP-76 SH2 domain; the synergistic IL-2 promoter upregulation by FYN-T-FYB-SLP-76 requires FYB–SLP-76 interaction at these sites but not the FYB–FYN-T interaction.","method":"Site-directed mutagenesis of FYB tyrosines, co-immunoprecipitation in Jurkat T cells, IL-2 promoter reporter assay","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis with defined binding and functional readouts","pmids":["10570256"],"is_preprint":false},{"year":1999,"finding":"A novel 130 kDa isoform of FYB (FYB-130) was identified containing a 46 amino acid insertion in the C-terminal region; both FYB-120 and FYB-130 bind SH2 domains of FYN-T and SLP-76, are FYN-T substrates, and localize to the cytoplasm and nucleus; FYB-130 more efficiently up-regulates anti-CD3-driven NF-AT transcription when co-expressed with FYN-T and SLP-76; FYB gene maps to human chromosome 5p13.1.","method":"cDNA cloning, co-immunoprecipitation, fluorescence in situ hybridization, NF-AT reporter assay in T cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — single lab, multiple orthogonal methods","pmids":["10497204"],"is_preprint":false},{"year":2000,"finding":"FYB/SLAP was identified as a ligand for Ena/VASP homology 1 (EVH1) domains; upon TCR engagement, FYB/SLAP localizes at the T cell–APC interface alongside Evl, WASP, and Arp2/3; FYB/SLAP associates with Ena/VASP proteins and is present in complexes with WASP, Nck, and SLP-76; inhibition of FYB/SLAP–Ena/VASP or WASP–Arp2/3 binding impairs TCR-dependent actin rearrangement.","method":"EVH1 domain binding assay, co-immunoprecipitation, confocal microscopy/localization at bead interface, perturbation by dominant-negative constructs measuring actin polymerization","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (binding, co-IP, imaging, functional inhibition), highly cited, replicated in subsequent phagocytosis study","pmids":["10747096"],"is_preprint":false},{"year":2000,"finding":"alpha4beta1 integrin stimulation of T cells causes tyrosine phosphorylation of SLAP-130/FYB and enhances its association with p59fyn SH2 domain; overexpression of SLAP-130/FYB enhances T cell migration through fibronectin-coated filters in response to SDF-1alpha, identifying FYB as a substrate and regulator in beta1 integrin signaling.","method":"Integrin stimulation, immunoprecipitation with phosphotyrosine antibody, migration assay through fibronectin filters, overexpression in primary T cells","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — functional assay with mechanistic biochemical readout, single lab","pmids":["10640723"],"is_preprint":false},{"year":2000,"finding":"Overexpression of SLAP-130 abrogates SLP-76 rescue of signaling in SLP-76-deficient Jurkat cells specifically for TCR-induced ERK activation but not PLCgamma1 phosphorylation; tyrosine 559 of SLAP-130 is critical for the SLP-76 interaction and for SLAP-130's negative regulatory effect on SLP-76 function.","method":"Co-transfection rescue assay in SLP-76-deficient Jurkat cells, deletion and point mutants of SLAP-130, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis with defined functional readout, single lab","pmids":["10671560"],"is_preprint":false},{"year":2001,"finding":"T cells from SLAP-130/FYB (ADAP) knockout mice show markedly impaired proliferation after CD3 engagement; TCR-stimulated clustering of integrin LFA-1 is defective in SLAP-130/FYB-deficient cells whereas TCR-induced actin polymerization is normal; SLAP-130/FYB couples TCR-mediated cytoskeletal rearrangement to integrin LFA-1 clustering and activation.","method":"Genetic knockout mouse model, T cell proliferation assay, LFA-1 clustering by microscopy, actin polymerization assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KO with specific cellular phenotypic dissection, independently replicated by concurrent Science paper PMID 11567140","pmids":["11567141"],"is_preprint":false},{"year":2001,"finding":"Fyb/Slap-deficient T cells exhibit defective proliferation and cytokine production; Fyb/Slap has no role in F-actin polymerization or TCR clustering but is required for TCR-induced integrin clustering and adhesion; Fyb/Slap is required in vivo for T cell-dependent immune responses.","method":"Genetic knockout mouse model, proliferation assay, cytokine measurement, integrin clustering assay, F-actin polymerization assay, in vivo immune response","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KO with mechanistic dissection, concurrent with PMID 11567141","pmids":["11567140"],"is_preprint":false},{"year":2001,"finding":"FYB up-regulates integrin-mediated adhesion to fibronectin and mediator (beta-hexosaminidase) release in RBL-2H3 mast cells upon FcepsilonRI aggregation; the FYB SH3 domain is required for mediator release but not adhesion; FcepsilonRI aggregation increases FYB tyrosine phosphorylation; FYB colocalizes with F-actin in membrane ruffles.","method":"Overexpression in RBL-2H3 mast cells, adhesion assay to fibronectin, beta-hexosaminidase release assay, SH3 domain deletion mutants, confocal immunofluorescence","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — functional dissection with domain mutants and two independent readouts","pmids":["11553777"],"is_preprint":false},{"year":2001,"finding":"Upon induction of phagocytosis, a large molecular complex containing Fyb/SLAP, Ena/VASP proteins, SLP-76, Nck, and WASP is assembled in macrophages; Fyb/SLAP activation of Fcgamma receptors leads to recruitment of VASP and profilin; a second Nck pathway recruits WASP; these converge to regulate actin polymerization required for pseudopod extension and particle ingestion.","method":"Co-immunoprecipitation, confocal microscopy of phagosome formation, phagocytosis efficiency assay in primary and immortalized macrophages","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP plus imaging plus functional phagocytosis assay, high citation count","pmids":["11739662"],"is_preprint":false},{"year":2001,"finding":"FYB (ADAP) promotes beta1 integrin clustering on mast cells in a selective manner (FcepsilonRI clustering is unaffected), extending ADAP's modulatory role from beta2 to beta1 integrins.","method":"Overexpression of ADAP in mast cells, flow cytometry assessment of beta1 integrin and FcepsilonRI clustering kinetics","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — single overexpression approach, single lab, but mechanistically clear outcome","pmids":["11741310"],"is_preprint":false},{"year":2003,"finding":"The Yersinia phosphatase YopH interacts with Fyb in macrophages via both phosphotyrosine-dependent and phosphotyrosine-independent mechanisms; YopH dephosphorylates Fyb; mutants unable to bind p130Cas/Fyb fail to localize to focal complexes in infected cells and are attenuated in virulence, demonstrating Fyb phosphorylation is biologically relevant in Yersinia infection.","method":"YopH mutant analysis in infected cells, immunofluorescence co-localization, virulence attenuation assay, phosphatase activity measurement","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic mutant with mechanistic and virulence readouts, single lab","pmids":["12542470"],"is_preprint":false},{"year":2003,"finding":"MIST directly associates with SLAP-130 via the MIST SH2 domain; collaboration of SLAP-130 with SKAP55 is required for recruitment of MIST to Lyn in mast cells; MIST is preferentially recruited to Fyn rather than Lyn, regulated by higher affinity of SLAP-130/SKAP55 for Fyn-SH2 versus Lyn-SH2.","method":"Co-immunoprecipitation in mast cell lines, binding assays with SH2 domain constructs","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP with SH2 domain specificity determination, single lab","pmids":["12681493"],"is_preprint":false},{"year":2004,"finding":"The C-terminal domain of ADAP (FYB/SLAP-130) was solved by NMR spectroscopy and found to represent an altered SH3 domain fold (helically extended SH3, hSH3) in which an N-terminal amphipathic helix contacts the regular SH3 fold, creating a composite surface that can no longer bind conventional proline-rich peptides.","method":"NMR structure determination of ADAP C-terminal domain","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 — NMR structure with functional validation (loss of proline-rich peptide binding)","pmids":["15062083"],"is_preprint":false},{"year":2004,"finding":"ADAP-SLP-76 binding differentially regulates pSMAC formation versus T cell-APC conjugation: mutation of YDDV sites in ADAP (M12) prevents SLP-76 SH2 binding and acts as dominant negative for pSMAC formation and IL-2 production, but has distinct effects on conjugation; ADAP colocalizes with LFA-1 at the immunological synapse.","method":"Mutational analysis of ADAP YDDV sites, T cell-APC conjugation assay, microscopy of immunological synapse/SMAC formation, IL-2 production assay","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — domain mutagenesis with multiple functional readouts (conjugation, SMAC, cytokine), mechanistic dissection","pmids":["15477347"],"is_preprint":false},{"year":2005,"finding":"The hSH3 domain of ADAP binds acidic lipids including phosphatidylinositides (PIP2, PIP3); positively charged surface patches of the domain preferentially bind polyvalent acidic lipids; the N-terminal helix is required for lipid binding; this identifies the hSH3 as a novel lipid interaction domain suggesting ADAP directly interacts with phosphoinositide-enriched plasma membrane regions.","method":"In vitro lipid binding assays (liposome sedimentation, lipid overlay), site-directed mutagenesis of basic residues, NMR mapping","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mutagenesis and NMR, single lab but multiple orthogonal methods","pmids":["15843031"],"is_preprint":false},{"year":2005,"finding":"SKAP55 protein is unstable in ADAP-deficient Jurkat T cells and is protected from rapid proteolysis (~15-20 min half-life) by ADAP binding via the SKAP55 SH3 domain; ADAP restores SKAP55 expression by decreasing its proteolysis rate ~5-fold; the SKAP55 SH3 domain (which mediates SKAP55-ADAP association) is required for ADAP's protective effect.","method":"ADAP-deficient Jurkat cell line, SKAP55 half-life measurement by cycloheximide chase, rescue by ADAP reconstitution, SH3 domain mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — quantitative protein stability assay with domain mutagenesis rescue, clean loss-of-function cell line","pmids":["15849195"],"is_preprint":false},{"year":2005,"finding":"FYB (Fyb) interacts with mammalian actin-binding protein 1 (mAbp1) via the mAbp1 SH3 domain binding the Fyb N-terminal region; the interaction is detected in macrophage lysates and both proteins co-localize with F-actin at the leading edge.","method":"Yeast two-hybrid screen with Fyb domains as bait, co-immunoprecipitation in macrophage lysates, co-localization by immunofluorescence","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 — yeast two-hybrid plus co-IP plus imaging, single lab","pmids":["15848169"],"is_preprint":false},{"year":2005,"finding":"ADAP associates with c-Src in osteoclast precursors and RAW264 cells; c-Src kinase activity and SH2 domain are required for this association; Tyr807 in the ADAP C-terminus is a major c-Src recognition site; ADAP tyrosine phosphorylation is integrin-dependent and Src kinase-dependent; ADAP-knockdown cells show retarded migration and impaired multinucleated cell (osteoclast) formation.","method":"Pull-down/mass spectrometry identification, co-immunoprecipitation with c-Src, siRNA knockdown, migration and fusion assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP domain mapping plus functional KD, single lab","pmids":["16020549"],"is_preprint":false},{"year":2006,"finding":"The ADAP/SKAP55 signaling module is required for TCR-mediated integrin activation; ADAP/SKAP55 interaction is mandatory; disruption of the module displaces the small GTPase Rap1 from the plasma membrane without affecting its GTPase activity; membrane-targeted ADAP/SKAP55 induces T cell adhesion in the absence of TCR stimulation.","method":"Dominant-negative and membrane-targeted constructs, Rap1 localization by subcellular fractionation and microscopy, adhesion assays, GTPase activity measurement","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic tools with mechanistic Rap1 localization readout, replicated by RIAM study PMID 17403904","pmids":["16980616"],"is_preprint":false},{"year":2006,"finding":"ADAP is required for normal alphaIIbbeta3 activation in platelets downstream of VWF/GP Ib-IX-V and other agonists (ADP, PAR4); ADAP stabilizes SKAP-HOM expression via interaction with SKAP-HOM SH3 domain; ADAP-deficient mice show increased rebleeding from tail wounds and reduced stable adhesion under shear flow.","method":"ADAP knockout mice, fibrinogen/ligand-mimetic binding assay, flow cytometry of integrin activation, tail bleeding assay, shear flow adhesion assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KO with multiple platelet functional assays, mechanistic dissection of SKAP-HOM stabilization","pmids":["17003372"],"is_preprint":false},{"year":2007,"finding":"ADAP regulates TCR-mediated NF-kappaB activation; ADAP-deficient T cells show impaired NF-kappaB nuclear translocation, reduced IkappaB degradation/phosphorylation, and impaired CARMA1-BCL-10-MALT1 complex assembly; a distinct region of ADAP is required for CARMA1 association and NF-kappaB activation but is not required for ADAP-dependent adhesion.","method":"ADAP knockout T cells, NF-kappaB reporter/EMSA, IkappaB phosphorylation/degradation, CARMA1-BCL10-MALT1 co-immunoprecipitation, domain mapping mutants","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — clean KO with mechanistic domain dissection separating two ADAP functions, multiple orthogonal readouts","pmids":["17478723"],"is_preprint":false},{"year":2007,"finding":"RIAM constitutively interacts with SKAP-55 in T cells; the ADAP/SKAP-55 module relocates RIAM and Rap1 to the plasma membrane following TCR activation; SKAP-55/RIAM complex is essential for TCR-mediated adhesion and T cell-APC conjugate formation; RIAM links ADAP/SKAP-55 to active Rap1.","method":"Co-immunoprecipitation in transfection system and primary T cells, domain mapping, subcellular fractionation, adhesion and conjugate formation assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP with domain mapping plus functional adhesion readout, builds on PMID 16980616","pmids":["17403904"],"is_preprint":false},{"year":2009,"finding":"ADAP is an essential component of alphaIIbbeta3-mediated platelet mechanotransduction; ADAP-deficient platelets show defective spreading and F-actin assembly under shear flow (but not static conditions), form unstable thrombi after carotid artery injury, and fail to assemble F-actin-rich structures containing SLP-76 and phospho-Vav1; defect is specific to ADAP and not VASP or SKAP-HOM.","method":"ADAP knockout mice, shear flow platelet spreading assay, intravital carotid injury thrombosis model, confocal microscopy of F-actin/SLP-76/Vav1 structures","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KO with mechanistic dissection (shear-specific defect, protein-specific rescue comparison), multiple readouts","pmids":["19996090"],"is_preprint":false},{"year":2009,"finding":"The SLP-76-ADAP module is required for LFA-1-mediated costimulation of IL-2 production, F-actin clustering, cell polarization, and T cell motility; LFA-1 costimulation of IL-2 is completely dependent on SLP-76-ADAP binding (M12 mutant blocks all effects); ADAP expression with LFA-1 ligation alone is sufficient to polarize T cells; LFA-1-ADAP polarization depends on Src kinases, Rho GTPases, PLC, and PI3K.","method":"ADAP-/- primary T cells, ADAP mutants (M12), IL-2 production assay, F-actin clustering microscopy, T cell polarization assay, motility assay, pharmacological inhibitors","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — KO plus domain mutant with multiple functional readouts","pmids":["19617540"],"is_preprint":false},{"year":2010,"finding":"ADAP requires two distinct sites to activate NF-kappaB in T cells: a CARMA1-binding site critical for IKKgamma ubiquitination, and a TAK1-binding site critical for IKK phosphorylation; ADAP recruits TAK1 and the CBM complex but not IKK to PKCtheta; ADAP is not required for TAK1 activation itself.","method":"ADAP domain mutants expressed in ADAP-deficient T cells, co-immunoprecipitation of TAK1/CARMA1/IKK with PKCtheta, IKK phosphorylation/ubiquitination assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — domain mutagenesis with mechanistic dissection of two binding sites and distinct molecular readouts","pmids":["20164171"],"is_preprint":false},{"year":2010,"finding":"Quantitative mass spectrometry (SILAC and 18O-labeling) of phosphopeptide pulldowns identified SLP-76, Ras GTPase activating protein, and other TCR proximal complex proteins as phosphorylation-dependent interaction partners of ADAP at Y595, Y625, and Y771; Nck was confirmed as a direct phosphorylation-dependent binding partner of ADAP.","method":"Phosphopeptide pulldown, SILAC and 18O quantitative mass spectrometry from Jurkat lysates","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 2 — quantitative MS with two orthogonal labeling methods, confirms known and identifies novel interactions","pmids":["20568816"],"is_preprint":false},{"year":2010,"finding":"ADAP contains multiple phosphotyrosine sites; SLP-76, PLCgamma, PIK3R1, Nck, CRK, Gads, and RasGAP are phospho-dependent binding partners of the central YDDV motif of ADAP; phosphorylation-dependent ADAP–Nck interaction is confirmed by yeast two-hybrid, immunoprecipitation, and pulldown, indicating ADAP directly links integrins to cytoskeletal modulators independently of SLP-76.","method":"In vitro phosphorylation/mass spectrometry mapping, Y-to-F mutagenesis, SILAC peptide pulldown, yeast two-hybrid, immunoprecipitation, binary pulldown","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, comprehensive phosphoproteomics plus functional validation","pmids":["20661443"],"is_preprint":false},{"year":2011,"finding":"The ADAP/SKAP55 module controls CCR7-mediated LFA-1 affinity and avidity regulation; two independent pools of the ADAP/SKAP55 module exist: one interacts with RAPL/Mst1 and another with RIAM/Mst1/Kindlin-3; both pools require ADAP/SKAP55 to bind LFA-1 upon CCR7 stimulation; loss of the module delays lymph node homing and reduces intranodal T cell motility in vivo.","method":"ADAP/SKAP55-deficient mice, co-immunoprecipitation of module with RAPL/RIAM complexes, in vivo homing assay, intravital two-photon microscopy, LFA-1 affinity/avidity assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with mechanistic complex dissection and in vivo readouts","pmids":["22117043"],"is_preprint":false},{"year":2011,"finding":"Nck cooperates with ADAP for SLP-76-dependent actin rearrangement; Nck is necessary but insufficient for WASp recruitment; ADAP enables SLP-76-WASp interactions via the SLP-76 SH2 domain binding ADAP; Nck interacts via its SH2 domain with phosphorylated YDDV sites on ADAP.","method":"siRNA knockdown of Nck/ADAP, co-immunoprecipitation, actin polymerization assay, WASp recruitment microscopy","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple KD combinations with mechanistic pathway placement and defined actin readout","pmids":["21536650"],"is_preprint":false},{"year":2011,"finding":"Physical association of ADAP with SKAP55 is both necessary and sufficient to rescue integrin function in ADAP-deficient T cells (shown via SKAP-ADAP chimera); SKAP55 pleckstrin homology domain residue R131 is required for ADAP recruitment to LFA-1 and for integrin activation; the SKAP55-PH domain restricts ADAP from associating with the NF-kappaB signalosome.","method":"SKAP-ADAP chimeric fusion protein, PH domain point mutant (R131M), ADAP-deficient T cell reconstitution, LFA-1 co-immunoprecipitation, NF-kappaB reporter assay","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1/2 — chimeric protein plus mutagenesis with functional rescue, mechanistic dissection of two ADAP pools","pmids":["21525391"],"is_preprint":false},{"year":2012,"finding":"SLP-76 and ADAP are required for E-selectin-mediated integrin activation and slow leukocyte rolling promoting ischemia-reperfusion-induced AKI in mice; two N-terminal tyrosines and SH2 domain of SLP-76 are required; Bruton tyrosine kinase acts downstream of SLP-76 and together with ADAP regulates PI3Kgamma- and PLCgamma2-dependent integrin affinity and avidity; blocking both pathways abolishes integrin regulation.","method":"Genetically engineered mice, transduced Slp76-/- leukocytes, slow rolling assay, pharmacological inhibitors of PI3Kgamma/PLCgamma2, AKI model","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic and pharmacological tools with mechanistic pathway dissection and in vivo readouts","pmids":["22291096"],"is_preprint":false},{"year":2013,"finding":"ADAP contains three binding sites for SLP-76 SH2 domain; multipoint binding to ADAP oligomerizes the SLP-76 SH2 domain in vitro; all three binding sites are critical for SLP-76 microcluster assembly but any two sites partially restore microclusters; multipoint ADAP–SLP-76 binding facilitates assembly of SLP-76 microclusters.","method":"Biophysical methods (analytical ultracentrifugation, SPR) to characterize SLP-76 SH2–ADAP interactions, confocal imaging of microclusters, ADAP mutants with combinations of binding site mutations","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution of oligomerization plus cellular imaging with systematic mutagenesis","pmids":["23979596"],"is_preprint":false},{"year":2013,"finding":"Fyn and ADAP form a complex that exclusively regulates production of inflammatory cytokines (but not cytotoxicity) in NK cells via a Carma1-Bcl-10-MAP3K7 signaling axis.","method":"Genetic knockouts (Fyn, ADAP), NK cell cytotoxicity assay, cytokine production measurement, co-immunoprecipitation of Fyn-ADAP complex","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KOs with mechanistic pathway placement separating two effector functions","pmids":["24036998"],"is_preprint":false},{"year":2014,"finding":"Nck1 and Nck2 interact with ADAP via their SH2 domains at phosphorylated Y595DDV and Y651DDV sites; endogenous ADAP is phosphorylated at these sites in primary human T cell blasts; ADAP and Nck cooperatively facilitate T cell adhesion to ICAM-1.","method":"Co-immunoprecipitation in primary human T cells, SH2 domain specificity assay, adhesion assay to ICAM-1","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP with site specificity confirmed in primary cells plus functional adhesion readout, single lab","pmids":["24769494"],"is_preprint":false},{"year":2014,"finding":"ADAP promotes activation of integrin alphaIIbbeta3 in platelets through distinct associations with talin and kindlin-3; GST pulldowns identified separate ADAP regions for talin vs. kindlin binding; ADAP-deficient platelets show reduced talin co-localization with alphaIIbbeta3 and reduced irreversible fibrinogen binding; in CHO cells, ADAP enables kindlin-3 to promote agonist-dependent alphaIIbbeta3 activation within an alphaIIbbeta3/talin complex.","method":"GST pulldown domain mapping, proximity ligation assay, immunofluorescence co-localization, flow cytometry of integrin activation, reconstitution in CHO cells, ADAP knockout platelets","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1/2 — in vitro pulldown domain mapping plus reconstitution in heterologous cells plus KO platelet phenotype, multiple orthogonal approaches","pmids":["24523237"],"is_preprint":false},{"year":2015,"finding":"Loss-of-function mutation (c.393G>A nonsense) in the FYB gene causes autosomal recessive small-platelet thrombocytopenia in humans; patient platelets show reduced pseudopodium formation, increased basal P-selectin/PAC-1 expression, and reduced increment of activation markers after ADP stimulation, demonstrating ADAP is required for normal platelet production and function.","method":"Homozygosity mapping, exome sequencing, bone marrow morphology, flow cytometry of platelet activation markers, scanning electron microscopy of platelet morphology","journal":"Journal of thrombosis and haemostasis","confidence":"High","confidence_rationale":"Tier 2 — human disease-causing loss-of-function mutation with multiple platelet functional readouts","pmids":["25876182"],"is_preprint":false},{"year":2015,"finding":"The ADAP-SKAP55 module reduces CD8+ T cell cytotoxicity and enhances PD-1 expression in a Fyn-, Ca2+-, and NFATc1-dependent manner; knockout of SKAP55 or ADAP reduces PD-1 expression on CD8+ effector cells and enhances anti-tumor immunity in vivo.","method":"ADAP/SKAP55 knockout mice, DC vaccine tumor models, adoptive transfer of KO CD8+ T cells, NFATc1 inhibitor (CsA), PD-1 flow cytometry","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with mechanistic pathway (Fyn-Ca2+-NFATc1-PD-1) and in vivo tumor readouts, single lab","pmids":["25851535"],"is_preprint":false},{"year":2015,"finding":"ADAP forms a complex with TRAF6 and TAK1 in CD8+ T cells and activates SMAD3 to increase autocrine TGF-beta1 production; TGF-beta1 induces CD103 expression via an ADAP-, TRAF6-, and SMAD3-dependent pathway, creating a positive feedback loop protecting from influenza virus infection.","method":"Co-immunoprecipitation of ADAP-TRAF6-TAK1 complex, SMAD3 phosphorylation assay, ADAP-/- mice CD8+ T cells, TGF-beta1/CD103 expression measurement, influenza infection model","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP of complex plus KO with cytokine and integrin readouts, single lab","pmids":["25909459"],"is_preprint":false},{"year":2015,"finding":"ZAP70 is identified as a novel ADAP interaction partner via its N-terminal SH2 domain binding phosphorylated ADAP-hSH3(N) at pY571; this interaction is inducible by TCR or chemokine stimulation; Y571 of ADAP is required for chemokine-directed T cell migration but not TCR-dependent adhesion or conjugate formation.","method":"SILAC interaction proteomics, NMR spectroscopy mapping of ZAP70-SH2–ADAP interaction, microscale thermophoresis (Kd = 2.3 µM), Y571F mutant functional assay (adhesion, migration)","journal":"Molecular & cellular proteomics","confidence":"High","confidence_rationale":"Tier 1/2 — NMR structural mapping plus biophysical Kd measurement plus functional mutagenesis","pmids":["26246585"],"is_preprint":false},{"year":2017,"finding":"Ubc9 (SUMO E2 conjugase) directly interacts with ADAP in vitro and in vivo via ADAP residues 674-700 (nuclear localization sequence); this interaction increases upon anti-CD3 stimulation; knockdown of Ubc9 or expression of Ubc9-binding-deficient ADAP mutant decreases TCR-induced integrin adhesion, LFA-1 clustering, and membrane recruitment of Rap1/RapL and Rac1 activation, without affecting TCR proximal signaling.","method":"Co-immunoprecipitation in vitro and in vivo, domain mapping, shRNA knockdown, Rac1 GTPase activity assay, Rap1/RapL subcellular fractionation, integrin adhesion/clustering assays","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding with domain mapping plus functional KD with mechanistic Rap1/Rac1 readouts, single lab","pmids":["29127148"],"is_preprint":false},{"year":2018,"finding":"ADAP is an upstream regulator that pre-positions at TCR contact sites before SLP-76; pY595 is essential for normal ADAP function and virtually all ADAP phosphorylation is restricted to the pY595 pool; multivalent SLP-76 SH2–ADAP interactions are required to sustain ADAP phosphorylation; non-phosphorylated ADAP enriches in actin-rich protrusive structures and promotes retention/assembly of nascent SLP-76 oligomers into persistent microclusters.","method":"Live-cell imaging with phospho-specific anti-pY595 antibody, point mutants of ADAP, SLP-76 microcluster analysis, integrin-independent adhesion assay, CD69 upregulation assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — phospho-specific antibody with live imaging, mutagenesis, and multiple functional readouts, mechanistically novel upstream positioning","pmids":["30305305"],"is_preprint":false},{"year":2018,"finding":"ADAP deficiency in megakaryocytes causes microthrombocytopenia due to impaired MK polarization and ectopic release of (pro)platelet-like particles into the bone marrow compartment; ADAP-deficient MKs show reduced spreading on extracellular matrix, impaired podosome formation, defective polarization of the demarcation membrane system, and reduced beta1 integrin activation.","method":"Constitutive and MK-specific (PF4-Cre) ADAP knockout mice, 3D confocal whole-sternum imaging, intravital 2-photon microscopy, cultured MK spreading/podosome assay, beta1 integrin activation flow cytometry","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with mechanistic MK-intrinsic defect shown by multiple imaging and functional approaches","pmids":["29950291"],"is_preprint":false},{"year":2021,"finding":"ADAP phosphorylation at Y571 is required to prime STAT3 for activation in TLR4-stimulated macrophages; ADAP interacts with STAT3 and loss of ADAP reduces LPS-mediated STAT3 phosphorylation and enhances M1 macrophage polarization; Y571F mutation severely impairs ADAP's ability to stimulate STAT3 activity.","method":"ADAP-/- macrophages, Y571F point mutant, co-immunoprecipitation of ADAP-STAT3, STAT3 phosphorylation assay, cytokine profiling, macrophage polarization assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — KO plus mutagenesis with mechanistic co-IP and functional polarization readout, single lab","pmids":["33431658"],"is_preprint":false},{"year":2022,"finding":"ADAP restrains platelet phagocytosis by macrophages in ITP by competing with STAT1 for binding to importin alpha5; ADAP deficiency potentiates STAT1 nuclear entry, selectively enhancing FcgammaRI/IV transcription; pharmacological inhibition of STAT1 or disruption of STAT1-importin alpha5 interaction relieves thrombocytopenia in ADAP-deficient mice.","method":"Adap-/- mice, co-immunoprecipitation of ADAP-STAT1-importin alpha5, competition binding assay, FcgammaR transcription measurement, macrophage phagocytosis assay, pharmacological rescue","journal":"Cellular & molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 — KO with mechanistic co-IP competition assay and pharmacological rescue, single lab","pmids":["35637282"],"is_preprint":false},{"year":2024,"finding":"ADAP selectively interacts with RIG-I (but not MDA5) and cooperates with it to activate IFN-beta transcription; ADAP deficiency increases ISGylation of RIG-I, whereas ADAP overexpression decreases RIG-I ISGylation; loss of ADAP impairs IRF3/TBK1 phosphorylation and increases RNA virus replication in macrophages.","method":"Co-immunoprecipitation (ADAP-RIG-I), ISGylation assay, IRF3/TBK1 phosphorylation measurement, ADAP-/- macrophages and mice, siRNA knockdown, IFN-beta reporter assay","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP with functional gain/loss of ISGylation and signaling readouts, KO mice, single lab","pmids":["38776321"],"is_preprint":false},{"year":2025,"finding":"BTK-mediated tyrosine phosphorylation of ADAP at Y571 cooperates with mTOR to converge on STAT3 activation for transactivation of the podoplanin (PDPN) promoter in TLR4-stimulated macrophages; ADAP deficiency prevents PDPN upregulation and blocks generation of a PDPNhi M2-like peritoneal macrophage subset that is protective in sepsis.","method":"ADAP-/- mice, BTK inhibition, mTOR inhibition, STAT3 activation assay, PDPN promoter reporter, peritoneal macrophage subset flow cytometry, sepsis model","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 — KO with mechanistic kinase-pathway dissection and in vivo sepsis readout, single lab","pmids":["39903516"],"is_preprint":false}],"current_model":"FYB1/ADAP is a hematopoietic-specific scaffold adapter that, upon phosphorylation by FYN-T at Y595/Y651 (and other sites), recruits SLP-76 (via SLP-76 SH2 domain), Fyn, Nck, Ena/VASP proteins, WASP, and SKAP55 into multiprotein signaling complexes that couple TCR, integrin, FcR, and TLR4 stimulation to actin cytoskeletal reorganization, integrin inside-out activation (through Rap1 membrane recruitment via RIAM/RAPL and association with talin/kindlin-3), LFA-1 clustering and adhesion, NF-kappaB activation (via CARMA1/BCL10/MALT1 and TAK1 binding sites in ADAP), platelet biogenesis, and innate immune regulation of STAT1, RIG-I ISGylation, and STAT3 signaling."},"narrative":{"teleology":[{"year":1997,"claim":"Identification of FYB as a hematopoietic adapter bridging FYN and SLP-76 established the molecular framework for understanding how TCR-proximal kinase signals are relayed through scaffold-mediated protein complexes.","evidence":"cDNA cloning, co-immunoprecipitation, yeast two-hybrid, and IL-2 reporter assays in T cell hybridomas and Jurkat cells","pmids":["9207119","9115214"],"confidence":"High","gaps":["Endogenous stoichiometry of FYB–SLP-76–FYN ternary complex unknown","Positive vs. negative regulatory role on IL-2 unresolved between overexpression systems"]},{"year":1998,"claim":"Discovery that SKAP55 binds FYB via its SH3 domain defined the ADAP/SKAP55 module as a stable signaling unit, raising the question of what downstream effectors this module controls.","evidence":"Yeast two-hybrid, reciprocal co-immunoprecipitation in T cells, confocal co-localization","pmids":["9671755","9748251"],"confidence":"High","gaps":["Functional consequence of SKAP55–FYB association not yet established","Whether SKAP55 stability depends on FYB binding unknown"]},{"year":1999,"claim":"Mapping Y595 and Y651 as FYN-T phosphorylation sites mediating SLP-76 SH2 binding, and showing their requirement for synergistic IL-2 upregulation, established that specific FYB phosphotyrosines are the critical signaling nodes rather than the FYB–FYN interaction itself.","evidence":"Site-directed mutagenesis, co-immunoprecipitation, IL-2 promoter reporter in Jurkat T cells","pmids":["10570256","10409671"],"confidence":"High","gaps":["Whether additional phosphosites have non-redundant roles unknown","In vivo relevance of individual phosphosites not tested"]},{"year":2000,"claim":"Linking FYB to Ena/VASP and WASP at the T cell–APC interface revealed how FYB couples TCR signaling to actin cytoskeletal remodeling, while integrin stimulation studies showed FYB participates in β1 integrin-driven migration, broadening its role beyond TCR signaling.","evidence":"EVH1 domain binding assays, co-immunoprecipitation, confocal microscopy at bead interfaces, dominant-negative perturbation of actin polymerization, migration assays through fibronectin","pmids":["10747096","10640723"],"confidence":"High","gaps":["Whether FYB–Ena/VASP interaction is direct or bridged by SLP-76 in vivo unclear","Relative contributions of Ena/VASP vs. WASP pathways not resolved"]},{"year":2001,"claim":"Genetic knockout of ADAP demonstrated its essential, non-redundant role in TCR-induced integrin (LFA-1) clustering and T cell proliferation—but not actin polymerization—definitively establishing ADAP as the bridge between TCR signaling and integrin inside-out activation in vivo.","evidence":"Two independent ADAP knockout mouse lines with LFA-1 clustering, actin polymerization, proliferation, and in vivo immune response assays","pmids":["11567141","11567140"],"confidence":"High","gaps":["Molecular mechanism by which ADAP enables integrin clustering not yet identified","Whether ADAP functions identically in all hematopoietic lineages unclear"]},{"year":2001,"claim":"Extension of ADAP function to mast cell FcεRI-driven adhesion and degranulation, and to macrophage FcγR-mediated phagocytosis, established ADAP as a general hematopoietic integrin–actin coupling adapter beyond T cells.","evidence":"Overexpression in RBL-2H3 mast cells with adhesion/degranulation assays; co-IP and phagocytosis assays in macrophages","pmids":["11553777","11739662"],"confidence":"Medium","gaps":["Mast cell studies relied on overexpression rather than loss-of-function","Whether ADAP-independent pathways compensate in phagocytes unknown"]},{"year":2004,"claim":"NMR structure of the ADAP C-terminal hSH3 domain revealed an atypical helically-extended SH3 fold incapable of binding proline-rich ligands, redirecting the search for its binding partners toward non-canonical interactions.","evidence":"NMR structure determination with functional validation of lost polyproline binding","pmids":["15062083"],"confidence":"High","gaps":["Physiological ligand of the hSH3 domain unresolved at this time","Whether lipid binding (later discovered) is the primary hSH3 function unknown"]},{"year":2005,"claim":"Discovery that the hSH3 domain binds phosphoinositides (PIP2/PIP3) via basic patches, and that ADAP stabilizes SKAP55 protein by preventing its rapid proteolysis, defined two new mechanistic roles—membrane targeting and chaperone-like stabilization—explaining how the ADAP/SKAP55 module is maintained and positioned.","evidence":"Liposome sedimentation, NMR mapping, mutagenesis of basic residues; cycloheximide chase in ADAP-deficient Jurkat cells with SKAP55 half-life measurement","pmids":["15843031","15849195"],"confidence":"High","gaps":["In vivo relevance of hSH3-lipid binding not demonstrated","Whether SKAP55 degradation pathway (proteasome vs. lysosome) defined"]},{"year":2006,"claim":"Demonstration that the ADAP/SKAP55 module recruits Rap1-GTP to the plasma membrane via RIAM, and that membrane-targeted ADAP/SKAP55 suffices to induce adhesion without TCR stimulation, identified the molecular mechanism by which ADAP activates integrins.","evidence":"Rap1 subcellular fractionation, membrane-targeted constructs, RIAM co-IP, adhesion and conjugate formation assays in T cells","pmids":["16980616","17403904"],"confidence":"High","gaps":["Which signals trigger ADAP/SKAP55 membrane translocation in the first place unclear","Contribution of RAPL vs. RIAM pools not yet separated"]},{"year":2007,"claim":"Identification of a separable ADAP domain that recruits the CARMA1–BCL10–MALT1 complex to activate NF-κB—independent of its integrin function—revealed ADAP as a bifunctional adapter with distinct structural modules for adhesion and transcriptional signaling.","evidence":"ADAP knockout T cells, NF-κB EMSA/reporter, IκB phosphorylation, CARMA1–BCL10–MALT1 co-IP, domain mapping mutants","pmids":["17478723"],"confidence":"High","gaps":["How ADAP is directed to NF-κB vs. integrin signalosomes not resolved","Whether NF-κB function requires prior ADAP phosphorylation unknown"]},{"year":2010,"claim":"Dissecting the two-site model (CARMA1-binding and TAK1-binding) for ADAP-mediated NF-κB activation, and comprehensive phosphoproteomic mapping of ADAP interactors, provided a detailed molecular wiring diagram of ADAP's signaling outputs.","evidence":"Domain mutants in ADAP-deficient T cells with IKK phosphorylation/ubiquitination readouts; SILAC/18O phosphopeptide pulldowns from Jurkat lysates","pmids":["20164171","20568816","20661443"],"confidence":"High","gaps":["Structural basis of ADAP–CARMA1 and ADAP–TAK1 interactions unknown","Relative quantitative contribution of each phosphosite in primary T cells not established"]},{"year":2011,"claim":"Mechanistic dissection of integrin activation showed ADAP/SKAP55 operates through two parallel effector pools (RAPL/Mst1 and RIAM/kindlin-3) for LFA-1 affinity/avidity control, and that the SKAP55-PH domain (R131) restricts ADAP from the NF-κB signalosome, providing a structural basis for functional bifurcation.","evidence":"ADAP/SKAP55-deficient mice with in vivo homing, intravital microscopy, co-IP of dual effector complexes; SKAP-ADAP chimera and PH-domain mutant reconstitution","pmids":["22117043","21525391","21536650"],"confidence":"High","gaps":["How the two effector pools are spatially segregated in the cell unclear","Whether post-translational modifications switch ADAP between pools unknown"]},{"year":2013,"claim":"Biophysical demonstration that multipoint ADAP–SLP-76 SH2 binding oligomerizes SLP-76 into microclusters explained how ADAP acts as a polyvalent scaffold for signalosome assembly, while Fyn–ADAP was shown to selectively control NK cell cytokine production via CARMA1–BCL10–MAP3K7.","evidence":"Analytical ultracentrifugation/SPR of SLP-76 SH2–ADAP, microcluster imaging with combinatorial mutants; Fyn/ADAP double KO NK cells with cytotoxicity vs. cytokine dissection","pmids":["23979596","24036998"],"confidence":"High","gaps":["Stoichiometry of the SLP-76 oligomer in living cells unknown","Whether Fyn–ADAP complex in NK cells uses same phosphosites as T cells untested"]},{"year":2014,"claim":"Identification of distinct ADAP regions that separately bind talin and kindlin-3, both required for full αIIbβ3 activation in platelets, defined the molecular mechanism of ADAP-dependent integrin activation in the hemostatic system.","evidence":"GST pulldown domain mapping, proximity ligation assay, reconstitution in CHO cells, ADAP KO platelet integrin activation assay","pmids":["24523237"],"confidence":"High","gaps":["Whether talin and kindlin-3 bind ADAP simultaneously or sequentially unknown","Crystal structure of ADAP–talin and ADAP–kindlin interfaces not available"]},{"year":2015,"claim":"A human nonsense mutation in FYB1 causing autosomal recessive small-platelet thrombocytopenia established FYB1 as a disease gene, while mechanistic work showed ADAP loss impairs megakaryocyte polarization and proplatelet release, and that ADAP/SKAP55 modulates PD-1 expression on CD8+ T cells via Fyn–Ca²⁺–NFATc1.","evidence":"Homozygosity mapping/exome sequencing in patient family, platelet morphology and activation assays; MK-specific KO mice with 3D imaging; ADAP/SKAP55 KO mice in tumor models with PD-1 flow cytometry","pmids":["25876182","29950291","25851535"],"confidence":"High","gaps":["Whether other FYB1 mutations cause thrombocytopenia in additional families not reported","Mechanism linking ADAP to NFATc1 nuclear translocation for PD-1 not fully defined"]},{"year":2015,"claim":"Discovery that ZAP70 binds ADAP at pY571 via its N-terminal SH2 domain, with Y571 selectively required for chemokine-directed migration but not TCR-dependent adhesion, revealed a third functional axis of ADAP phosphorylation distinct from integrin and NF-κB functions.","evidence":"SILAC proteomics, NMR mapping, microscale thermophoresis (Kd 2.3 µM), Y571F mutant functional assay","pmids":["26246585"],"confidence":"High","gaps":["Whether ZAP70–ADAP interaction occurs in non-T cells unknown","Downstream effectors of Y571-ZAP70 pathway for migration not identified"]},{"year":2018,"claim":"Live-cell imaging revealed ADAP pre-positions at TCR contact sites before SLP-76, with non-phosphorylated ADAP enriching in actin protrusions to seed nascent SLP-76 oligomers, revising the model from ADAP as a passive substrate to an upstream organizer of signalosome assembly.","evidence":"Phospho-specific anti-pY595 antibody live imaging, ADAP point mutants, SLP-76 microcluster kinetics analysis","pmids":["30305305"],"confidence":"High","gaps":["What targets non-phosphorylated ADAP to actin protrusions remains unknown","Whether upstream ADAP positioning involves hSH3-lipid interactions not tested"]},{"year":2021,"claim":"Extension of ADAP pY571 function to innate immunity showed ADAP primes STAT3 for TLR4-mediated activation in macrophages, controlling M1/M2 polarization, revealing an unexpected role for a classically lymphocyte-associated adapter in macrophage transcriptional programming.","evidence":"ADAP-/- macrophages, Y571F mutant, ADAP–STAT3 co-IP, STAT3 phosphorylation, macrophage polarization assay","pmids":["33431658"],"confidence":"Medium","gaps":["Whether ADAP directly binds STAT3 or requires an intermediary not resolved","Whether this pathway operates in human macrophages untested"]},{"year":2022,"claim":"Discovery that ADAP competes with STAT1 for importin-α5 binding, restraining STAT1 nuclear entry and FcγRI/IV transcription, explained the thrombocytopenic phenotype in ADAP-deficient mice through enhanced macrophage-mediated platelet phagocytosis and identified a pharmacologically targetable axis.","evidence":"ADAP KO mice, competition co-IP of ADAP–STAT1–importin-α5, FcγR transcription, phagocytosis assay, pharmacological STAT1 inhibitor rescue","pmids":["35637282"],"confidence":"Medium","gaps":["Whether ADAP–importin-α5 interaction is direct or STAT1-mediated not fully resolved","Relevance to human ITP not established"]},{"year":2024,"claim":"Identification of ADAP as a selective RIG-I interactor that suppresses RIG-I ISGylation to promote IRF3/TBK1 signaling and IFN-β production extended ADAP's role to antiviral innate immunity, demonstrating it modulates post-translational modification of pattern recognition receptors.","evidence":"Co-IP of ADAP–RIG-I, ISGylation assay, IRF3/TBK1 phosphorylation, ADAP-/- macrophages and mice with RNA virus infection","pmids":["38776321"],"confidence":"Medium","gaps":["Mechanism by which ADAP suppresses ISGylation unknown","Whether ADAP–RIG-I interaction requires ADAP phosphorylation not tested"]},{"year":null,"claim":"Outstanding questions include the structural basis for ADAP's multivalent scaffold function (no full-length structure exists), how ADAP is partitioned among its functionally distinct pools (integrin, NF-κB, STAT3, RIG-I) within a single cell, and whether its innate immune functions (STAT1/STAT3/RIG-I regulation) are mechanistically linked or fully independent pathways.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length or near-full-length ADAP structure available","Mechanism directing ADAP to distinct signaling pools not defined","Whether ADAP's innate immune functions are conserved in human macrophages not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,7,25,29,36]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[19]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[7,13,33]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[6,45]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[19,23,26]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[7,12,21]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[10,11,25,35,37,49]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[23,25,29,47]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[10,11,32,34]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[24,27,39,40]}],"complexes":["ADAP/SKAP55 module","CARMA1-BCL10-MALT1 (CBM) complex"],"partners":["SLP76","SKAP55","FYN","NCK1","RIAM","WASP","ZAP70","CARMA1"],"other_free_text":[]},"mechanistic_narrative":"FYB1 (ADAP/SLAP-130) is a hematopoietic-specific scaffolding adapter that couples antigen receptor, integrin, and innate immune receptor signaling to cytoskeletal reorganization, integrin inside-out activation, NF-κB signaling, and transcriptional regulation. Upon TCR or other receptor engagement, FYN-T phosphorylates FYB1 at Y595 and Y651, creating docking sites for the SLP-76 SH2 domain and Nck, thereby nucleating multiprotein signaling complexes containing Ena/VASP, WASP, and SKAP55 that drive actin polymerization, SLP-76 microcluster assembly, and—via SKAP55-mediated recruitment of Rap1/RIAM/RAPL and talin/kindlin-3—LFA-1 and αIIbβ3 integrin clustering and activation [PMID:10570256, PMID:10747096, PMID:11567141, PMID:17403904, PMID:24523237]. A separable ADAP domain recruits the CARMA1–BCL10–MALT1 complex and TAK1 to activate NF-κB independently of its integrin function, while phospho-Y571 mediates ZAP70 binding for chemokine-directed migration and primes STAT3 for TLR4-driven macrophage polarization [PMID:17478723, PMID:20164171, PMID:26246585, PMID:33431658]. Loss-of-function mutation in FYB1 causes autosomal recessive small-platelet thrombocytopenia in humans, consistent with its essential role in megakaryocyte polarization and proplatelet formation [PMID:25876182, PMID:29950291]."},"prefetch_data":{"uniprot":{"accession":"O15117","full_name":"FYN-binding protein 1","aliases":["Adhesion and degranulation promoting adaptor protein","ADAP","FYB-120/130","p120/p130","FYN-T-binding protein","SLAP-130","SLP-76-associated phosphoprotein"],"length_aa":783,"mass_kda":85.4,"function":"Acts as an adapter protein of the FYN and LCP2 signaling cascades in T-cells (By similarity). May play a role in linking T-cell signaling to remodeling of the actin cytoskeleton (PubMed:10747096, PubMed:16980616). Modulates the expression of IL2 (By similarity). Involved in platelet activation (By similarity). Prevents the degradation of SKAP1 and SKAP2 (PubMed:15849195). May be involved in high affinity immunoglobulin epsilon receptor signaling in mast cells (By similarity)","subcellular_location":"Cytoplasm; Nucleus; Cell junction","url":"https://www.uniprot.org/uniprotkb/O15117/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FYB1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FYB1","total_profiled":1310},"omim":[{"mim_id":"602731","title":"FYN-BINDING PROTEIN 1; FYB1","url":"https://www.omim.org/entry/602731"},{"mim_id":"273900","title":"THROMBOCYTOPENIA 3; THC3","url":"https://www.omim.org/entry/273900"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":50.1},{"tissue":"lymphoid tissue","ntpm":105.1}],"url":"https://www.proteinatlas.org/search/FYB1"},"hgnc":{"alias_symbol":["SLAP-130","FYB-120/130","ADAP"],"prev_symbol":["FYB"]},"alphafold":{"accession":"O15117","domains":[{"cath_id":"2.30.30.40","chopping":"481-580","consensus_level":"high","plddt":86.8294,"start":481,"end":580},{"cath_id":"2.30.30.40","chopping":"688-763","consensus_level":"high","plddt":89.7504,"start":688,"end":763}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O15117","model_url":"https://alphafold.ebi.ac.uk/files/AF-O15117-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O15117-F1-predicted_aligned_error_v6.png","plddt_mean":56.59},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FYB1","jax_strain_url":"https://www.jax.org/strain/search?query=FYB1"},"sequence":{"accession":"O15117","fasta_url":"https://rest.uniprot.org/uniprotkb/O15117.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O15117/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O15117"}},"corpus_meta":[{"pmid":"11567141","id":"PMC_11567141","title":"Coupling of the TCR to integrin activation by Slap-130/Fyb.","date":"2001","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/11567141","citation_count":250,"is_preprint":false},{"pmid":"10747096","id":"PMC_10747096","title":"Fyn-binding protein (Fyb)/SLP-76-associated protein (SLAP), Ena/vasodilator-stimulated phosphoprotein (VASP) proteins and the Arp2/3 complex link T cell receptor (TCR) signaling to the actin cytoskeleton.","date":"2000","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/10747096","citation_count":246,"is_preprint":false},{"pmid":"9207119","id":"PMC_9207119","title":"Cloning of a novel T-cell protein FYB that binds FYN and SH2-domain-containing leukocyte protein 76 and modulates interleukin 2 production.","date":"1997","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/9207119","citation_count":236,"is_preprint":false},{"pmid":"11567140","id":"PMC_11567140","title":"Positive regulation of T cell activation and integrin adhesion by the adapter Fyb/Slap.","date":"2001","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/11567140","citation_count":228,"is_preprint":false},{"pmid":"9115214","id":"PMC_9115214","title":"Molecular cloning of SLAP-130, an SLP-76-associated substrate of the T cell antigen receptor-stimulated protein tyrosine kinases.","date":"1997","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9115214","citation_count":213,"is_preprint":false},{"pmid":"11739662","id":"PMC_11739662","title":"Evidence for a molecular complex consisting of Fyb/SLAP, SLP-76, Nck, VASP and WASP that links the actin cytoskeleton to Fcgamma receptor signalling during phagocytosis.","date":"2001","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/11739662","citation_count":164,"is_preprint":false},{"pmid":"7669660","id":"PMC_7669660","title":"Mutations in the erythrocyte chemokine receptor (Duffy) gene: the molecular basis of the Fya/Fyb antigens and identification of a deletion in the Duffy gene of an apparently healthy individual with the Fy(a-b-) phenotype.","date":"1995","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/7669660","citation_count":118,"is_preprint":false},{"pmid":"9671755","id":"PMC_9671755","title":"FYB (FYN binding protein) serves as a binding partner for lymphoid protein and FYN kinase substrate SKAP55 and a SKAP55-related protein in T cells.","date":"1998","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/9671755","citation_count":117,"is_preprint":false},{"pmid":"7705836","id":"PMC_7705836","title":"Molecular basis and PCR-DNA typing of the Fya/fyb 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and Degranulation Promoting Adaptor Protein (ADAP) Reveals Novel Interaction Partners Required for Chemokine-directed T cell Migration.","date":"2015","source":"Molecular & cellular proteomics : MCP","url":"https://pubmed.ncbi.nlm.nih.gov/26246585","citation_count":7,"is_preprint":false},{"pmid":"29127148","id":"PMC_29127148","title":"Ubc9 Binds to ADAP and Is Required for Rap1 Membrane Recruitment, Rac1 Activation, and Integrin-Mediated T Cell Adhesion.","date":"2017","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/29127148","citation_count":6,"is_preprint":false},{"pmid":"38776321","id":"PMC_38776321","title":"Dampening of ISGylation of RIG-I by ADAP regulates type I interferon response of macrophages to RNA virus infection.","date":"2024","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/38776321","citation_count":5,"is_preprint":false},{"pmid":"27746719","id":"PMC_27746719","title":"Integrin Activation Through the Hematopoietic Adapter Molecule ADAP Regulates Dendritic Development of Hippocampal Neurons.","date":"2016","source":"Frontiers in molecular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/27746719","citation_count":5,"is_preprint":false},{"pmid":"18034344","id":"PMC_18034344","title":"Biological properties of 4-methyl-2,7-diamino-5,10-diphenyl-4,9-diazapyrenium hydrogensulfate (ADAP).","date":"2007","source":"Cancer chemotherapy and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/18034344","citation_count":5,"is_preprint":false},{"pmid":"33882129","id":"PMC_33882129","title":"Assessment of calciprotein particle formation by AUC of the absorbance change: effect of FYB-931, a novel bisphosphonate compound.","date":"2021","source":"The Journal of pharmacy and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/33882129","citation_count":5,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47708,"output_tokens":13061,"usd":0.169519},"stage2":{"model":"claude-opus-4-6","input_tokens":17140,"output_tokens":5380,"usd":0.3303},"total_usd":0.499819,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"FYB (p120/130) was cloned as a hematopoietic-specific adapter that associates with the Src kinase p59(Fyn) via direct binding, associates with SLP-76 via the SLP-76 SH2 domain, is tyrosine-phosphorylated upon TCR/CD3 ligation, and augments IL-2 secretion from T cell hybridomas in response to TCR stimulation.\",\n      \"method\": \"cDNA cloning, co-immunoprecipitation, yeast two-hybrid, overexpression in T cell hybridoma with IL-2 readout\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP and functional overexpression, foundational cloning paper, replicated by multiple subsequent labs\",\n      \"pmids\": [\"9207119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"SLAP-130 (FYB) was cloned as a SLP-76-associated phosphoprotein that binds the SH2 domain of SLP-76, is a substrate of TCR-induced protein tyrosine kinases, and when overexpressed diminishes TCR-induced IL-2 promoter activity and interferes with SLP-76 augmentation of IL-2 promoter activity, suggesting it acts as a negative regulator recruited by SLP-76.\",\n      \"method\": \"Molecular cloning, co-immunoprecipitation with SLP-76 SH2 domain, co-transfection/reporter assay in Jurkat cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (cloning, binding assay, functional reporter), foundational paper replicated by others\",\n      \"pmids\": [\"9115214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"FYB binds SKAP55 and SKAP55R through the SH3 domains of those proteins interacting with proline-rich sequences in FYB; FYB and SKAP55 colocalize in the perinuclear region; both SKAP55 and SKAP55R are FYN kinase substrates in T cells.\",\n      \"method\": \"Yeast two-hybrid screen with FYB as bait, co-immunoprecipitation in T cells, confocal immunofluorescence microscopy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid plus reciprocal co-IP plus imaging, replicated in subsequent work\",\n      \"pmids\": [\"9671755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"SLAP-130 (FYB) directly associates with SKAP55 via the SH3 domain of SKAP55 binding a proline-rich sequence of SLAP-130; both proteins are components of the Fyn complex in human T cells.\",\n      \"method\": \"Co-immunoprecipitation in COS cells and human T cells, co-transfection of truncation mutants, yeast two-hybrid\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — direct binding confirmed by domain-mapping mutagenesis and yeast two-hybrid, consistent with PMID 9671755\",\n      \"pmids\": [\"9748251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"FYN-T selectively phosphorylates FYB, creating docking sites for FYN-T and SLP-76 SH2 domains; co-expression of all three components (FYN-T, FYB, SLP-76) synergistically up-regulates TCR-driven IL-2 transcription; FYB phosphorylation shows distinct cytoplasmic localization and long-term stable kinetics.\",\n      \"method\": \"In vitro kinase assay with FYN-T, co-immunoprecipitation, co-transfection/IL-2 promoter luciferase reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro kinase assay plus functional co-expression reporter, replicated by PMID 10570256\",\n      \"pmids\": [\"10409671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Tyrosines Tyr595 and Tyr651 of FYB are the major FYN-T phosphorylation sites that mediate binding to the SLP-76 SH2 domain; the synergistic IL-2 promoter upregulation by FYN-T-FYB-SLP-76 requires FYB–SLP-76 interaction at these sites but not the FYB–FYN-T interaction.\",\n      \"method\": \"Site-directed mutagenesis of FYB tyrosines, co-immunoprecipitation in Jurkat T cells, IL-2 promoter reporter assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with defined binding and functional readouts\",\n      \"pmids\": [\"10570256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"A novel 130 kDa isoform of FYB (FYB-130) was identified containing a 46 amino acid insertion in the C-terminal region; both FYB-120 and FYB-130 bind SH2 domains of FYN-T and SLP-76, are FYN-T substrates, and localize to the cytoplasm and nucleus; FYB-130 more efficiently up-regulates anti-CD3-driven NF-AT transcription when co-expressed with FYN-T and SLP-76; FYB gene maps to human chromosome 5p13.1.\",\n      \"method\": \"cDNA cloning, co-immunoprecipitation, fluorescence in situ hybridization, NF-AT reporter assay in T cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — single lab, multiple orthogonal methods\",\n      \"pmids\": [\"10497204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"FYB/SLAP was identified as a ligand for Ena/VASP homology 1 (EVH1) domains; upon TCR engagement, FYB/SLAP localizes at the T cell–APC interface alongside Evl, WASP, and Arp2/3; FYB/SLAP associates with Ena/VASP proteins and is present in complexes with WASP, Nck, and SLP-76; inhibition of FYB/SLAP–Ena/VASP or WASP–Arp2/3 binding impairs TCR-dependent actin rearrangement.\",\n      \"method\": \"EVH1 domain binding assay, co-immunoprecipitation, confocal microscopy/localization at bead interface, perturbation by dominant-negative constructs measuring actin polymerization\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (binding, co-IP, imaging, functional inhibition), highly cited, replicated in subsequent phagocytosis study\",\n      \"pmids\": [\"10747096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"alpha4beta1 integrin stimulation of T cells causes tyrosine phosphorylation of SLAP-130/FYB and enhances its association with p59fyn SH2 domain; overexpression of SLAP-130/FYB enhances T cell migration through fibronectin-coated filters in response to SDF-1alpha, identifying FYB as a substrate and regulator in beta1 integrin signaling.\",\n      \"method\": \"Integrin stimulation, immunoprecipitation with phosphotyrosine antibody, migration assay through fibronectin filters, overexpression in primary T cells\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional assay with mechanistic biochemical readout, single lab\",\n      \"pmids\": [\"10640723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Overexpression of SLAP-130 abrogates SLP-76 rescue of signaling in SLP-76-deficient Jurkat cells specifically for TCR-induced ERK activation but not PLCgamma1 phosphorylation; tyrosine 559 of SLAP-130 is critical for the SLP-76 interaction and for SLAP-130's negative regulatory effect on SLP-76 function.\",\n      \"method\": \"Co-transfection rescue assay in SLP-76-deficient Jurkat cells, deletion and point mutants of SLAP-130, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis with defined functional readout, single lab\",\n      \"pmids\": [\"10671560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"T cells from SLAP-130/FYB (ADAP) knockout mice show markedly impaired proliferation after CD3 engagement; TCR-stimulated clustering of integrin LFA-1 is defective in SLAP-130/FYB-deficient cells whereas TCR-induced actin polymerization is normal; SLAP-130/FYB couples TCR-mediated cytoskeletal rearrangement to integrin LFA-1 clustering and activation.\",\n      \"method\": \"Genetic knockout mouse model, T cell proliferation assay, LFA-1 clustering by microscopy, actin polymerization assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO with specific cellular phenotypic dissection, independently replicated by concurrent Science paper PMID 11567140\",\n      \"pmids\": [\"11567141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Fyb/Slap-deficient T cells exhibit defective proliferation and cytokine production; Fyb/Slap has no role in F-actin polymerization or TCR clustering but is required for TCR-induced integrin clustering and adhesion; Fyb/Slap is required in vivo for T cell-dependent immune responses.\",\n      \"method\": \"Genetic knockout mouse model, proliferation assay, cytokine measurement, integrin clustering assay, F-actin polymerization assay, in vivo immune response\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO with mechanistic dissection, concurrent with PMID 11567141\",\n      \"pmids\": [\"11567140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"FYB up-regulates integrin-mediated adhesion to fibronectin and mediator (beta-hexosaminidase) release in RBL-2H3 mast cells upon FcepsilonRI aggregation; the FYB SH3 domain is required for mediator release but not adhesion; FcepsilonRI aggregation increases FYB tyrosine phosphorylation; FYB colocalizes with F-actin in membrane ruffles.\",\n      \"method\": \"Overexpression in RBL-2H3 mast cells, adhesion assay to fibronectin, beta-hexosaminidase release assay, SH3 domain deletion mutants, confocal immunofluorescence\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional dissection with domain mutants and two independent readouts\",\n      \"pmids\": [\"11553777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Upon induction of phagocytosis, a large molecular complex containing Fyb/SLAP, Ena/VASP proteins, SLP-76, Nck, and WASP is assembled in macrophages; Fyb/SLAP activation of Fcgamma receptors leads to recruitment of VASP and profilin; a second Nck pathway recruits WASP; these converge to regulate actin polymerization required for pseudopod extension and particle ingestion.\",\n      \"method\": \"Co-immunoprecipitation, confocal microscopy of phagosome formation, phagocytosis efficiency assay in primary and immortalized macrophages\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP plus imaging plus functional phagocytosis assay, high citation count\",\n      \"pmids\": [\"11739662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"FYB (ADAP) promotes beta1 integrin clustering on mast cells in a selective manner (FcepsilonRI clustering is unaffected), extending ADAP's modulatory role from beta2 to beta1 integrins.\",\n      \"method\": \"Overexpression of ADAP in mast cells, flow cytometry assessment of beta1 integrin and FcepsilonRI clustering kinetics\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single overexpression approach, single lab, but mechanistically clear outcome\",\n      \"pmids\": [\"11741310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The Yersinia phosphatase YopH interacts with Fyb in macrophages via both phosphotyrosine-dependent and phosphotyrosine-independent mechanisms; YopH dephosphorylates Fyb; mutants unable to bind p130Cas/Fyb fail to localize to focal complexes in infected cells and are attenuated in virulence, demonstrating Fyb phosphorylation is biologically relevant in Yersinia infection.\",\n      \"method\": \"YopH mutant analysis in infected cells, immunofluorescence co-localization, virulence attenuation assay, phosphatase activity measurement\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic mutant with mechanistic and virulence readouts, single lab\",\n      \"pmids\": [\"12542470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"MIST directly associates with SLAP-130 via the MIST SH2 domain; collaboration of SLAP-130 with SKAP55 is required for recruitment of MIST to Lyn in mast cells; MIST is preferentially recruited to Fyn rather than Lyn, regulated by higher affinity of SLAP-130/SKAP55 for Fyn-SH2 versus Lyn-SH2.\",\n      \"method\": \"Co-immunoprecipitation in mast cell lines, binding assays with SH2 domain constructs\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP with SH2 domain specificity determination, single lab\",\n      \"pmids\": [\"12681493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The C-terminal domain of ADAP (FYB/SLAP-130) was solved by NMR spectroscopy and found to represent an altered SH3 domain fold (helically extended SH3, hSH3) in which an N-terminal amphipathic helix contacts the regular SH3 fold, creating a composite surface that can no longer bind conventional proline-rich peptides.\",\n      \"method\": \"NMR structure determination of ADAP C-terminal domain\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure with functional validation (loss of proline-rich peptide binding)\",\n      \"pmids\": [\"15062083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ADAP-SLP-76 binding differentially regulates pSMAC formation versus T cell-APC conjugation: mutation of YDDV sites in ADAP (M12) prevents SLP-76 SH2 binding and acts as dominant negative for pSMAC formation and IL-2 production, but has distinct effects on conjugation; ADAP colocalizes with LFA-1 at the immunological synapse.\",\n      \"method\": \"Mutational analysis of ADAP YDDV sites, T cell-APC conjugation assay, microscopy of immunological synapse/SMAC formation, IL-2 production assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — domain mutagenesis with multiple functional readouts (conjugation, SMAC, cytokine), mechanistic dissection\",\n      \"pmids\": [\"15477347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The hSH3 domain of ADAP binds acidic lipids including phosphatidylinositides (PIP2, PIP3); positively charged surface patches of the domain preferentially bind polyvalent acidic lipids; the N-terminal helix is required for lipid binding; this identifies the hSH3 as a novel lipid interaction domain suggesting ADAP directly interacts with phosphoinositide-enriched plasma membrane regions.\",\n      \"method\": \"In vitro lipid binding assays (liposome sedimentation, lipid overlay), site-directed mutagenesis of basic residues, NMR mapping\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis and NMR, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"15843031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SKAP55 protein is unstable in ADAP-deficient Jurkat T cells and is protected from rapid proteolysis (~15-20 min half-life) by ADAP binding via the SKAP55 SH3 domain; ADAP restores SKAP55 expression by decreasing its proteolysis rate ~5-fold; the SKAP55 SH3 domain (which mediates SKAP55-ADAP association) is required for ADAP's protective effect.\",\n      \"method\": \"ADAP-deficient Jurkat cell line, SKAP55 half-life measurement by cycloheximide chase, rescue by ADAP reconstitution, SH3 domain mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — quantitative protein stability assay with domain mutagenesis rescue, clean loss-of-function cell line\",\n      \"pmids\": [\"15849195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"FYB (Fyb) interacts with mammalian actin-binding protein 1 (mAbp1) via the mAbp1 SH3 domain binding the Fyb N-terminal region; the interaction is detected in macrophage lysates and both proteins co-localize with F-actin at the leading edge.\",\n      \"method\": \"Yeast two-hybrid screen with Fyb domains as bait, co-immunoprecipitation in macrophage lysates, co-localization by immunofluorescence\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — yeast two-hybrid plus co-IP plus imaging, single lab\",\n      \"pmids\": [\"15848169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ADAP associates with c-Src in osteoclast precursors and RAW264 cells; c-Src kinase activity and SH2 domain are required for this association; Tyr807 in the ADAP C-terminus is a major c-Src recognition site; ADAP tyrosine phosphorylation is integrin-dependent and Src kinase-dependent; ADAP-knockdown cells show retarded migration and impaired multinucleated cell (osteoclast) formation.\",\n      \"method\": \"Pull-down/mass spectrometry identification, co-immunoprecipitation with c-Src, siRNA knockdown, migration and fusion assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP domain mapping plus functional KD, single lab\",\n      \"pmids\": [\"16020549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The ADAP/SKAP55 signaling module is required for TCR-mediated integrin activation; ADAP/SKAP55 interaction is mandatory; disruption of the module displaces the small GTPase Rap1 from the plasma membrane without affecting its GTPase activity; membrane-targeted ADAP/SKAP55 induces T cell adhesion in the absence of TCR stimulation.\",\n      \"method\": \"Dominant-negative and membrane-targeted constructs, Rap1 localization by subcellular fractionation and microscopy, adhesion assays, GTPase activity measurement\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic tools with mechanistic Rap1 localization readout, replicated by RIAM study PMID 17403904\",\n      \"pmids\": [\"16980616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ADAP is required for normal alphaIIbbeta3 activation in platelets downstream of VWF/GP Ib-IX-V and other agonists (ADP, PAR4); ADAP stabilizes SKAP-HOM expression via interaction with SKAP-HOM SH3 domain; ADAP-deficient mice show increased rebleeding from tail wounds and reduced stable adhesion under shear flow.\",\n      \"method\": \"ADAP knockout mice, fibrinogen/ligand-mimetic binding assay, flow cytometry of integrin activation, tail bleeding assay, shear flow adhesion assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO with multiple platelet functional assays, mechanistic dissection of SKAP-HOM stabilization\",\n      \"pmids\": [\"17003372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ADAP regulates TCR-mediated NF-kappaB activation; ADAP-deficient T cells show impaired NF-kappaB nuclear translocation, reduced IkappaB degradation/phosphorylation, and impaired CARMA1-BCL-10-MALT1 complex assembly; a distinct region of ADAP is required for CARMA1 association and NF-kappaB activation but is not required for ADAP-dependent adhesion.\",\n      \"method\": \"ADAP knockout T cells, NF-kappaB reporter/EMSA, IkappaB phosphorylation/degradation, CARMA1-BCL10-MALT1 co-immunoprecipitation, domain mapping mutants\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with mechanistic domain dissection separating two ADAP functions, multiple orthogonal readouts\",\n      \"pmids\": [\"17478723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RIAM constitutively interacts with SKAP-55 in T cells; the ADAP/SKAP-55 module relocates RIAM and Rap1 to the plasma membrane following TCR activation; SKAP-55/RIAM complex is essential for TCR-mediated adhesion and T cell-APC conjugate formation; RIAM links ADAP/SKAP-55 to active Rap1.\",\n      \"method\": \"Co-immunoprecipitation in transfection system and primary T cells, domain mapping, subcellular fractionation, adhesion and conjugate formation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with domain mapping plus functional adhesion readout, builds on PMID 16980616\",\n      \"pmids\": [\"17403904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ADAP is an essential component of alphaIIbbeta3-mediated platelet mechanotransduction; ADAP-deficient platelets show defective spreading and F-actin assembly under shear flow (but not static conditions), form unstable thrombi after carotid artery injury, and fail to assemble F-actin-rich structures containing SLP-76 and phospho-Vav1; defect is specific to ADAP and not VASP or SKAP-HOM.\",\n      \"method\": \"ADAP knockout mice, shear flow platelet spreading assay, intravital carotid injury thrombosis model, confocal microscopy of F-actin/SLP-76/Vav1 structures\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO with mechanistic dissection (shear-specific defect, protein-specific rescue comparison), multiple readouts\",\n      \"pmids\": [\"19996090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The SLP-76-ADAP module is required for LFA-1-mediated costimulation of IL-2 production, F-actin clustering, cell polarization, and T cell motility; LFA-1 costimulation of IL-2 is completely dependent on SLP-76-ADAP binding (M12 mutant blocks all effects); ADAP expression with LFA-1 ligation alone is sufficient to polarize T cells; LFA-1-ADAP polarization depends on Src kinases, Rho GTPases, PLC, and PI3K.\",\n      \"method\": \"ADAP-/- primary T cells, ADAP mutants (M12), IL-2 production assay, F-actin clustering microscopy, T cell polarization assay, motility assay, pharmacological inhibitors\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO plus domain mutant with multiple functional readouts\",\n      \"pmids\": [\"19617540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ADAP requires two distinct sites to activate NF-kappaB in T cells: a CARMA1-binding site critical for IKKgamma ubiquitination, and a TAK1-binding site critical for IKK phosphorylation; ADAP recruits TAK1 and the CBM complex but not IKK to PKCtheta; ADAP is not required for TAK1 activation itself.\",\n      \"method\": \"ADAP domain mutants expressed in ADAP-deficient T cells, co-immunoprecipitation of TAK1/CARMA1/IKK with PKCtheta, IKK phosphorylation/ubiquitination assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — domain mutagenesis with mechanistic dissection of two binding sites and distinct molecular readouts\",\n      \"pmids\": [\"20164171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Quantitative mass spectrometry (SILAC and 18O-labeling) of phosphopeptide pulldowns identified SLP-76, Ras GTPase activating protein, and other TCR proximal complex proteins as phosphorylation-dependent interaction partners of ADAP at Y595, Y625, and Y771; Nck was confirmed as a direct phosphorylation-dependent binding partner of ADAP.\",\n      \"method\": \"Phosphopeptide pulldown, SILAC and 18O quantitative mass spectrometry from Jurkat lysates\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — quantitative MS with two orthogonal labeling methods, confirms known and identifies novel interactions\",\n      \"pmids\": [\"20568816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ADAP contains multiple phosphotyrosine sites; SLP-76, PLCgamma, PIK3R1, Nck, CRK, Gads, and RasGAP are phospho-dependent binding partners of the central YDDV motif of ADAP; phosphorylation-dependent ADAP–Nck interaction is confirmed by yeast two-hybrid, immunoprecipitation, and pulldown, indicating ADAP directly links integrins to cytoskeletal modulators independently of SLP-76.\",\n      \"method\": \"In vitro phosphorylation/mass spectrometry mapping, Y-to-F mutagenesis, SILAC peptide pulldown, yeast two-hybrid, immunoprecipitation, binary pulldown\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, comprehensive phosphoproteomics plus functional validation\",\n      \"pmids\": [\"20661443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The ADAP/SKAP55 module controls CCR7-mediated LFA-1 affinity and avidity regulation; two independent pools of the ADAP/SKAP55 module exist: one interacts with RAPL/Mst1 and another with RIAM/Mst1/Kindlin-3; both pools require ADAP/SKAP55 to bind LFA-1 upon CCR7 stimulation; loss of the module delays lymph node homing and reduces intranodal T cell motility in vivo.\",\n      \"method\": \"ADAP/SKAP55-deficient mice, co-immunoprecipitation of module with RAPL/RIAM complexes, in vivo homing assay, intravital two-photon microscopy, LFA-1 affinity/avidity assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with mechanistic complex dissection and in vivo readouts\",\n      \"pmids\": [\"22117043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Nck cooperates with ADAP for SLP-76-dependent actin rearrangement; Nck is necessary but insufficient for WASp recruitment; ADAP enables SLP-76-WASp interactions via the SLP-76 SH2 domain binding ADAP; Nck interacts via its SH2 domain with phosphorylated YDDV sites on ADAP.\",\n      \"method\": \"siRNA knockdown of Nck/ADAP, co-immunoprecipitation, actin polymerization assay, WASp recruitment microscopy\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple KD combinations with mechanistic pathway placement and defined actin readout\",\n      \"pmids\": [\"21536650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Physical association of ADAP with SKAP55 is both necessary and sufficient to rescue integrin function in ADAP-deficient T cells (shown via SKAP-ADAP chimera); SKAP55 pleckstrin homology domain residue R131 is required for ADAP recruitment to LFA-1 and for integrin activation; the SKAP55-PH domain restricts ADAP from associating with the NF-kappaB signalosome.\",\n      \"method\": \"SKAP-ADAP chimeric fusion protein, PH domain point mutant (R131M), ADAP-deficient T cell reconstitution, LFA-1 co-immunoprecipitation, NF-kappaB reporter assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — chimeric protein plus mutagenesis with functional rescue, mechanistic dissection of two ADAP pools\",\n      \"pmids\": [\"21525391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SLP-76 and ADAP are required for E-selectin-mediated integrin activation and slow leukocyte rolling promoting ischemia-reperfusion-induced AKI in mice; two N-terminal tyrosines and SH2 domain of SLP-76 are required; Bruton tyrosine kinase acts downstream of SLP-76 and together with ADAP regulates PI3Kgamma- and PLCgamma2-dependent integrin affinity and avidity; blocking both pathways abolishes integrin regulation.\",\n      \"method\": \"Genetically engineered mice, transduced Slp76-/- leukocytes, slow rolling assay, pharmacological inhibitors of PI3Kgamma/PLCgamma2, AKI model\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic and pharmacological tools with mechanistic pathway dissection and in vivo readouts\",\n      \"pmids\": [\"22291096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ADAP contains three binding sites for SLP-76 SH2 domain; multipoint binding to ADAP oligomerizes the SLP-76 SH2 domain in vitro; all three binding sites are critical for SLP-76 microcluster assembly but any two sites partially restore microclusters; multipoint ADAP–SLP-76 binding facilitates assembly of SLP-76 microclusters.\",\n      \"method\": \"Biophysical methods (analytical ultracentrifugation, SPR) to characterize SLP-76 SH2–ADAP interactions, confocal imaging of microclusters, ADAP mutants with combinations of binding site mutations\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution of oligomerization plus cellular imaging with systematic mutagenesis\",\n      \"pmids\": [\"23979596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Fyn and ADAP form a complex that exclusively regulates production of inflammatory cytokines (but not cytotoxicity) in NK cells via a Carma1-Bcl-10-MAP3K7 signaling axis.\",\n      \"method\": \"Genetic knockouts (Fyn, ADAP), NK cell cytotoxicity assay, cytokine production measurement, co-immunoprecipitation of Fyn-ADAP complex\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KOs with mechanistic pathway placement separating two effector functions\",\n      \"pmids\": [\"24036998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Nck1 and Nck2 interact with ADAP via their SH2 domains at phosphorylated Y595DDV and Y651DDV sites; endogenous ADAP is phosphorylated at these sites in primary human T cell blasts; ADAP and Nck cooperatively facilitate T cell adhesion to ICAM-1.\",\n      \"method\": \"Co-immunoprecipitation in primary human T cells, SH2 domain specificity assay, adhesion assay to ICAM-1\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP with site specificity confirmed in primary cells plus functional adhesion readout, single lab\",\n      \"pmids\": [\"24769494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ADAP promotes activation of integrin alphaIIbbeta3 in platelets through distinct associations with talin and kindlin-3; GST pulldowns identified separate ADAP regions for talin vs. kindlin binding; ADAP-deficient platelets show reduced talin co-localization with alphaIIbbeta3 and reduced irreversible fibrinogen binding; in CHO cells, ADAP enables kindlin-3 to promote agonist-dependent alphaIIbbeta3 activation within an alphaIIbbeta3/talin complex.\",\n      \"method\": \"GST pulldown domain mapping, proximity ligation assay, immunofluorescence co-localization, flow cytometry of integrin activation, reconstitution in CHO cells, ADAP knockout platelets\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro pulldown domain mapping plus reconstitution in heterologous cells plus KO platelet phenotype, multiple orthogonal approaches\",\n      \"pmids\": [\"24523237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss-of-function mutation (c.393G>A nonsense) in the FYB gene causes autosomal recessive small-platelet thrombocytopenia in humans; patient platelets show reduced pseudopodium formation, increased basal P-selectin/PAC-1 expression, and reduced increment of activation markers after ADP stimulation, demonstrating ADAP is required for normal platelet production and function.\",\n      \"method\": \"Homozygosity mapping, exome sequencing, bone marrow morphology, flow cytometry of platelet activation markers, scanning electron microscopy of platelet morphology\",\n      \"journal\": \"Journal of thrombosis and haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human disease-causing loss-of-function mutation with multiple platelet functional readouts\",\n      \"pmids\": [\"25876182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The ADAP-SKAP55 module reduces CD8+ T cell cytotoxicity and enhances PD-1 expression in a Fyn-, Ca2+-, and NFATc1-dependent manner; knockout of SKAP55 or ADAP reduces PD-1 expression on CD8+ effector cells and enhances anti-tumor immunity in vivo.\",\n      \"method\": \"ADAP/SKAP55 knockout mice, DC vaccine tumor models, adoptive transfer of KO CD8+ T cells, NFATc1 inhibitor (CsA), PD-1 flow cytometry\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with mechanistic pathway (Fyn-Ca2+-NFATc1-PD-1) and in vivo tumor readouts, single lab\",\n      \"pmids\": [\"25851535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ADAP forms a complex with TRAF6 and TAK1 in CD8+ T cells and activates SMAD3 to increase autocrine TGF-beta1 production; TGF-beta1 induces CD103 expression via an ADAP-, TRAF6-, and SMAD3-dependent pathway, creating a positive feedback loop protecting from influenza virus infection.\",\n      \"method\": \"Co-immunoprecipitation of ADAP-TRAF6-TAK1 complex, SMAD3 phosphorylation assay, ADAP-/- mice CD8+ T cells, TGF-beta1/CD103 expression measurement, influenza infection model\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP of complex plus KO with cytokine and integrin readouts, single lab\",\n      \"pmids\": [\"25909459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ZAP70 is identified as a novel ADAP interaction partner via its N-terminal SH2 domain binding phosphorylated ADAP-hSH3(N) at pY571; this interaction is inducible by TCR or chemokine stimulation; Y571 of ADAP is required for chemokine-directed T cell migration but not TCR-dependent adhesion or conjugate formation.\",\n      \"method\": \"SILAC interaction proteomics, NMR spectroscopy mapping of ZAP70-SH2–ADAP interaction, microscale thermophoresis (Kd = 2.3 µM), Y571F mutant functional assay (adhesion, migration)\",\n      \"journal\": \"Molecular & cellular proteomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — NMR structural mapping plus biophysical Kd measurement plus functional mutagenesis\",\n      \"pmids\": [\"26246585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Ubc9 (SUMO E2 conjugase) directly interacts with ADAP in vitro and in vivo via ADAP residues 674-700 (nuclear localization sequence); this interaction increases upon anti-CD3 stimulation; knockdown of Ubc9 or expression of Ubc9-binding-deficient ADAP mutant decreases TCR-induced integrin adhesion, LFA-1 clustering, and membrane recruitment of Rap1/RapL and Rac1 activation, without affecting TCR proximal signaling.\",\n      \"method\": \"Co-immunoprecipitation in vitro and in vivo, domain mapping, shRNA knockdown, Rac1 GTPase activity assay, Rap1/RapL subcellular fractionation, integrin adhesion/clustering assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding with domain mapping plus functional KD with mechanistic Rap1/Rac1 readouts, single lab\",\n      \"pmids\": [\"29127148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ADAP is an upstream regulator that pre-positions at TCR contact sites before SLP-76; pY595 is essential for normal ADAP function and virtually all ADAP phosphorylation is restricted to the pY595 pool; multivalent SLP-76 SH2–ADAP interactions are required to sustain ADAP phosphorylation; non-phosphorylated ADAP enriches in actin-rich protrusive structures and promotes retention/assembly of nascent SLP-76 oligomers into persistent microclusters.\",\n      \"method\": \"Live-cell imaging with phospho-specific anti-pY595 antibody, point mutants of ADAP, SLP-76 microcluster analysis, integrin-independent adhesion assay, CD69 upregulation assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — phospho-specific antibody with live imaging, mutagenesis, and multiple functional readouts, mechanistically novel upstream positioning\",\n      \"pmids\": [\"30305305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ADAP deficiency in megakaryocytes causes microthrombocytopenia due to impaired MK polarization and ectopic release of (pro)platelet-like particles into the bone marrow compartment; ADAP-deficient MKs show reduced spreading on extracellular matrix, impaired podosome formation, defective polarization of the demarcation membrane system, and reduced beta1 integrin activation.\",\n      \"method\": \"Constitutive and MK-specific (PF4-Cre) ADAP knockout mice, 3D confocal whole-sternum imaging, intravital 2-photon microscopy, cultured MK spreading/podosome assay, beta1 integrin activation flow cytometry\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with mechanistic MK-intrinsic defect shown by multiple imaging and functional approaches\",\n      \"pmids\": [\"29950291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ADAP phosphorylation at Y571 is required to prime STAT3 for activation in TLR4-stimulated macrophages; ADAP interacts with STAT3 and loss of ADAP reduces LPS-mediated STAT3 phosphorylation and enhances M1 macrophage polarization; Y571F mutation severely impairs ADAP's ability to stimulate STAT3 activity.\",\n      \"method\": \"ADAP-/- macrophages, Y571F point mutant, co-immunoprecipitation of ADAP-STAT3, STAT3 phosphorylation assay, cytokine profiling, macrophage polarization assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO plus mutagenesis with mechanistic co-IP and functional polarization readout, single lab\",\n      \"pmids\": [\"33431658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ADAP restrains platelet phagocytosis by macrophages in ITP by competing with STAT1 for binding to importin alpha5; ADAP deficiency potentiates STAT1 nuclear entry, selectively enhancing FcgammaRI/IV transcription; pharmacological inhibition of STAT1 or disruption of STAT1-importin alpha5 interaction relieves thrombocytopenia in ADAP-deficient mice.\",\n      \"method\": \"Adap-/- mice, co-immunoprecipitation of ADAP-STAT1-importin alpha5, competition binding assay, FcgammaR transcription measurement, macrophage phagocytosis assay, pharmacological rescue\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with mechanistic co-IP competition assay and pharmacological rescue, single lab\",\n      \"pmids\": [\"35637282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ADAP selectively interacts with RIG-I (but not MDA5) and cooperates with it to activate IFN-beta transcription; ADAP deficiency increases ISGylation of RIG-I, whereas ADAP overexpression decreases RIG-I ISGylation; loss of ADAP impairs IRF3/TBK1 phosphorylation and increases RNA virus replication in macrophages.\",\n      \"method\": \"Co-immunoprecipitation (ADAP-RIG-I), ISGylation assay, IRF3/TBK1 phosphorylation measurement, ADAP-/- macrophages and mice, siRNA knockdown, IFN-beta reporter assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with functional gain/loss of ISGylation and signaling readouts, KO mice, single lab\",\n      \"pmids\": [\"38776321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BTK-mediated tyrosine phosphorylation of ADAP at Y571 cooperates with mTOR to converge on STAT3 activation for transactivation of the podoplanin (PDPN) promoter in TLR4-stimulated macrophages; ADAP deficiency prevents PDPN upregulation and blocks generation of a PDPNhi M2-like peritoneal macrophage subset that is protective in sepsis.\",\n      \"method\": \"ADAP-/- mice, BTK inhibition, mTOR inhibition, STAT3 activation assay, PDPN promoter reporter, peritoneal macrophage subset flow cytometry, sepsis model\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with mechanistic kinase-pathway dissection and in vivo sepsis readout, single lab\",\n      \"pmids\": [\"39903516\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FYB1/ADAP is a hematopoietic-specific scaffold adapter that, upon phosphorylation by FYN-T at Y595/Y651 (and other sites), recruits SLP-76 (via SLP-76 SH2 domain), Fyn, Nck, Ena/VASP proteins, WASP, and SKAP55 into multiprotein signaling complexes that couple TCR, integrin, FcR, and TLR4 stimulation to actin cytoskeletal reorganization, integrin inside-out activation (through Rap1 membrane recruitment via RIAM/RAPL and association with talin/kindlin-3), LFA-1 clustering and adhesion, NF-kappaB activation (via CARMA1/BCL10/MALT1 and TAK1 binding sites in ADAP), platelet biogenesis, and innate immune regulation of STAT1, RIG-I ISGylation, and STAT3 signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FYB1 (ADAP/SLAP-130) is a hematopoietic-specific scaffolding adapter that couples antigen receptor, integrin, and innate immune receptor signaling to cytoskeletal reorganization, integrin inside-out activation, NF-κB signaling, and transcriptional regulation. Upon TCR or other receptor engagement, FYN-T phosphorylates FYB1 at Y595 and Y651, creating docking sites for the SLP-76 SH2 domain and Nck, thereby nucleating multiprotein signaling complexes containing Ena/VASP, WASP, and SKAP55 that drive actin polymerization, SLP-76 microcluster assembly, and—via SKAP55-mediated recruitment of Rap1/RIAM/RAPL and talin/kindlin-3—LFA-1 and αIIbβ3 integrin clustering and activation [PMID:10570256, PMID:10747096, PMID:11567141, PMID:17403904, PMID:24523237]. A separable ADAP domain recruits the CARMA1–BCL10–MALT1 complex and TAK1 to activate NF-κB independently of its integrin function, while phospho-Y571 mediates ZAP70 binding for chemokine-directed migration and primes STAT3 for TLR4-driven macrophage polarization [PMID:17478723, PMID:20164171, PMID:26246585, PMID:33431658]. Loss-of-function mutation in FYB1 causes autosomal recessive small-platelet thrombocytopenia in humans, consistent with its essential role in megakaryocyte polarization and proplatelet formation [PMID:25876182, PMID:29950291].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Identification of FYB as a hematopoietic adapter bridging FYN and SLP-76 established the molecular framework for understanding how TCR-proximal kinase signals are relayed through scaffold-mediated protein complexes.\",\n      \"evidence\": \"cDNA cloning, co-immunoprecipitation, yeast two-hybrid, and IL-2 reporter assays in T cell hybridomas and Jurkat cells\",\n      \"pmids\": [\"9207119\", \"9115214\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous stoichiometry of FYB–SLP-76–FYN ternary complex unknown\", \"Positive vs. negative regulatory role on IL-2 unresolved between overexpression systems\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Discovery that SKAP55 binds FYB via its SH3 domain defined the ADAP/SKAP55 module as a stable signaling unit, raising the question of what downstream effectors this module controls.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal co-immunoprecipitation in T cells, confocal co-localization\",\n      \"pmids\": [\"9671755\", \"9748251\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of SKAP55–FYB association not yet established\", \"Whether SKAP55 stability depends on FYB binding unknown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Mapping Y595 and Y651 as FYN-T phosphorylation sites mediating SLP-76 SH2 binding, and showing their requirement for synergistic IL-2 upregulation, established that specific FYB phosphotyrosines are the critical signaling nodes rather than the FYB–FYN interaction itself.\",\n      \"evidence\": \"Site-directed mutagenesis, co-immunoprecipitation, IL-2 promoter reporter in Jurkat T cells\",\n      \"pmids\": [\"10570256\", \"10409671\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional phosphosites have non-redundant roles unknown\", \"In vivo relevance of individual phosphosites not tested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Linking FYB to Ena/VASP and WASP at the T cell–APC interface revealed how FYB couples TCR signaling to actin cytoskeletal remodeling, while integrin stimulation studies showed FYB participates in β1 integrin-driven migration, broadening its role beyond TCR signaling.\",\n      \"evidence\": \"EVH1 domain binding assays, co-immunoprecipitation, confocal microscopy at bead interfaces, dominant-negative perturbation of actin polymerization, migration assays through fibronectin\",\n      \"pmids\": [\"10747096\", \"10640723\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FYB–Ena/VASP interaction is direct or bridged by SLP-76 in vivo unclear\", \"Relative contributions of Ena/VASP vs. WASP pathways not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Genetic knockout of ADAP demonstrated its essential, non-redundant role in TCR-induced integrin (LFA-1) clustering and T cell proliferation—but not actin polymerization—definitively establishing ADAP as the bridge between TCR signaling and integrin inside-out activation in vivo.\",\n      \"evidence\": \"Two independent ADAP knockout mouse lines with LFA-1 clustering, actin polymerization, proliferation, and in vivo immune response assays\",\n      \"pmids\": [\"11567141\", \"11567140\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which ADAP enables integrin clustering not yet identified\", \"Whether ADAP functions identically in all hematopoietic lineages unclear\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Extension of ADAP function to mast cell FcεRI-driven adhesion and degranulation, and to macrophage FcγR-mediated phagocytosis, established ADAP as a general hematopoietic integrin–actin coupling adapter beyond T cells.\",\n      \"evidence\": \"Overexpression in RBL-2H3 mast cells with adhesion/degranulation assays; co-IP and phagocytosis assays in macrophages\",\n      \"pmids\": [\"11553777\", \"11739662\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mast cell studies relied on overexpression rather than loss-of-function\", \"Whether ADAP-independent pathways compensate in phagocytes unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"NMR structure of the ADAP C-terminal hSH3 domain revealed an atypical helically-extended SH3 fold incapable of binding proline-rich ligands, redirecting the search for its binding partners toward non-canonical interactions.\",\n      \"evidence\": \"NMR structure determination with functional validation of lost polyproline binding\",\n      \"pmids\": [\"15062083\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological ligand of the hSH3 domain unresolved at this time\", \"Whether lipid binding (later discovered) is the primary hSH3 function unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Discovery that the hSH3 domain binds phosphoinositides (PIP2/PIP3) via basic patches, and that ADAP stabilizes SKAP55 protein by preventing its rapid proteolysis, defined two new mechanistic roles—membrane targeting and chaperone-like stabilization—explaining how the ADAP/SKAP55 module is maintained and positioned.\",\n      \"evidence\": \"Liposome sedimentation, NMR mapping, mutagenesis of basic residues; cycloheximide chase in ADAP-deficient Jurkat cells with SKAP55 half-life measurement\",\n      \"pmids\": [\"15843031\", \"15849195\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of hSH3-lipid binding not demonstrated\", \"Whether SKAP55 degradation pathway (proteasome vs. lysosome) defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstration that the ADAP/SKAP55 module recruits Rap1-GTP to the plasma membrane via RIAM, and that membrane-targeted ADAP/SKAP55 suffices to induce adhesion without TCR stimulation, identified the molecular mechanism by which ADAP activates integrins.\",\n      \"evidence\": \"Rap1 subcellular fractionation, membrane-targeted constructs, RIAM co-IP, adhesion and conjugate formation assays in T cells\",\n      \"pmids\": [\"16980616\", \"17403904\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which signals trigger ADAP/SKAP55 membrane translocation in the first place unclear\", \"Contribution of RAPL vs. RIAM pools not yet separated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identification of a separable ADAP domain that recruits the CARMA1–BCL10–MALT1 complex to activate NF-κB—independent of its integrin function—revealed ADAP as a bifunctional adapter with distinct structural modules for adhesion and transcriptional signaling.\",\n      \"evidence\": \"ADAP knockout T cells, NF-κB EMSA/reporter, IκB phosphorylation, CARMA1–BCL10–MALT1 co-IP, domain mapping mutants\",\n      \"pmids\": [\"17478723\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ADAP is directed to NF-κB vs. integrin signalosomes not resolved\", \"Whether NF-κB function requires prior ADAP phosphorylation unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Dissecting the two-site model (CARMA1-binding and TAK1-binding) for ADAP-mediated NF-κB activation, and comprehensive phosphoproteomic mapping of ADAP interactors, provided a detailed molecular wiring diagram of ADAP's signaling outputs.\",\n      \"evidence\": \"Domain mutants in ADAP-deficient T cells with IKK phosphorylation/ubiquitination readouts; SILAC/18O phosphopeptide pulldowns from Jurkat lysates\",\n      \"pmids\": [\"20164171\", \"20568816\", \"20661443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ADAP–CARMA1 and ADAP–TAK1 interactions unknown\", \"Relative quantitative contribution of each phosphosite in primary T cells not established\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mechanistic dissection of integrin activation showed ADAP/SKAP55 operates through two parallel effector pools (RAPL/Mst1 and RIAM/kindlin-3) for LFA-1 affinity/avidity control, and that the SKAP55-PH domain (R131) restricts ADAP from the NF-κB signalosome, providing a structural basis for functional bifurcation.\",\n      \"evidence\": \"ADAP/SKAP55-deficient mice with in vivo homing, intravital microscopy, co-IP of dual effector complexes; SKAP-ADAP chimera and PH-domain mutant reconstitution\",\n      \"pmids\": [\"22117043\", \"21525391\", \"21536650\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the two effector pools are spatially segregated in the cell unclear\", \"Whether post-translational modifications switch ADAP between pools unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Biophysical demonstration that multipoint ADAP–SLP-76 SH2 binding oligomerizes SLP-76 into microclusters explained how ADAP acts as a polyvalent scaffold for signalosome assembly, while Fyn–ADAP was shown to selectively control NK cell cytokine production via CARMA1–BCL10–MAP3K7.\",\n      \"evidence\": \"Analytical ultracentrifugation/SPR of SLP-76 SH2–ADAP, microcluster imaging with combinatorial mutants; Fyn/ADAP double KO NK cells with cytotoxicity vs. cytokine dissection\",\n      \"pmids\": [\"23979596\", \"24036998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of the SLP-76 oligomer in living cells unknown\", \"Whether Fyn–ADAP complex in NK cells uses same phosphosites as T cells untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of distinct ADAP regions that separately bind talin and kindlin-3, both required for full αIIbβ3 activation in platelets, defined the molecular mechanism of ADAP-dependent integrin activation in the hemostatic system.\",\n      \"evidence\": \"GST pulldown domain mapping, proximity ligation assay, reconstitution in CHO cells, ADAP KO platelet integrin activation assay\",\n      \"pmids\": [\"24523237\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether talin and kindlin-3 bind ADAP simultaneously or sequentially unknown\", \"Crystal structure of ADAP–talin and ADAP–kindlin interfaces not available\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"A human nonsense mutation in FYB1 causing autosomal recessive small-platelet thrombocytopenia established FYB1 as a disease gene, while mechanistic work showed ADAP loss impairs megakaryocyte polarization and proplatelet release, and that ADAP/SKAP55 modulates PD-1 expression on CD8+ T cells via Fyn–Ca²⁺–NFATc1.\",\n      \"evidence\": \"Homozygosity mapping/exome sequencing in patient family, platelet morphology and activation assays; MK-specific KO mice with 3D imaging; ADAP/SKAP55 KO mice in tumor models with PD-1 flow cytometry\",\n      \"pmids\": [\"25876182\", \"29950291\", \"25851535\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other FYB1 mutations cause thrombocytopenia in additional families not reported\", \"Mechanism linking ADAP to NFATc1 nuclear translocation for PD-1 not fully defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Discovery that ZAP70 binds ADAP at pY571 via its N-terminal SH2 domain, with Y571 selectively required for chemokine-directed migration but not TCR-dependent adhesion, revealed a third functional axis of ADAP phosphorylation distinct from integrin and NF-κB functions.\",\n      \"evidence\": \"SILAC proteomics, NMR mapping, microscale thermophoresis (Kd 2.3 µM), Y571F mutant functional assay\",\n      \"pmids\": [\"26246585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ZAP70–ADAP interaction occurs in non-T cells unknown\", \"Downstream effectors of Y571-ZAP70 pathway for migration not identified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Live-cell imaging revealed ADAP pre-positions at TCR contact sites before SLP-76, with non-phosphorylated ADAP enriching in actin protrusions to seed nascent SLP-76 oligomers, revising the model from ADAP as a passive substrate to an upstream organizer of signalosome assembly.\",\n      \"evidence\": \"Phospho-specific anti-pY595 antibody live imaging, ADAP point mutants, SLP-76 microcluster kinetics analysis\",\n      \"pmids\": [\"30305305\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"What targets non-phosphorylated ADAP to actin protrusions remains unknown\", \"Whether upstream ADAP positioning involves hSH3-lipid interactions not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extension of ADAP pY571 function to innate immunity showed ADAP primes STAT3 for TLR4-mediated activation in macrophages, controlling M1/M2 polarization, revealing an unexpected role for a classically lymphocyte-associated adapter in macrophage transcriptional programming.\",\n      \"evidence\": \"ADAP-/- macrophages, Y571F mutant, ADAP–STAT3 co-IP, STAT3 phosphorylation, macrophage polarization assay\",\n      \"pmids\": [\"33431658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ADAP directly binds STAT3 or requires an intermediary not resolved\", \"Whether this pathway operates in human macrophages untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery that ADAP competes with STAT1 for importin-α5 binding, restraining STAT1 nuclear entry and FcγRI/IV transcription, explained the thrombocytopenic phenotype in ADAP-deficient mice through enhanced macrophage-mediated platelet phagocytosis and identified a pharmacologically targetable axis.\",\n      \"evidence\": \"ADAP KO mice, competition co-IP of ADAP–STAT1–importin-α5, FcγR transcription, phagocytosis assay, pharmacological STAT1 inhibitor rescue\",\n      \"pmids\": [\"35637282\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ADAP–importin-α5 interaction is direct or STAT1-mediated not fully resolved\", \"Relevance to human ITP not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of ADAP as a selective RIG-I interactor that suppresses RIG-I ISGylation to promote IRF3/TBK1 signaling and IFN-β production extended ADAP's role to antiviral innate immunity, demonstrating it modulates post-translational modification of pattern recognition receptors.\",\n      \"evidence\": \"Co-IP of ADAP–RIG-I, ISGylation assay, IRF3/TBK1 phosphorylation, ADAP-/- macrophages and mice with RNA virus infection\",\n      \"pmids\": [\"38776321\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which ADAP suppresses ISGylation unknown\", \"Whether ADAP–RIG-I interaction requires ADAP phosphorylation not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Outstanding questions include the structural basis for ADAP's multivalent scaffold function (no full-length structure exists), how ADAP is partitioned among its functionally distinct pools (integrin, NF-κB, STAT3, RIG-I) within a single cell, and whether its innate immune functions (STAT1/STAT3/RIG-I regulation) are mechanistically linked or fully independent pathways.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length or near-full-length ADAP structure available\", \"Mechanism directing ADAP to distinct signaling pools not defined\", \"Whether ADAP's innate immune functions are conserved in human macrophages not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 7, 25, 29, 36]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [19]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [7, 13, 33]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [6, 45]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [19, 23, 26]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [7, 12, 21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [10, 11, 25, 35, 37, 49]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [23, 25, 29, 47]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [10, 11, 32, 34]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [24, 27, 39, 40]}\n    ],\n    \"complexes\": [\n      \"ADAP/SKAP55 module\",\n      \"CARMA1-BCL10-MALT1 (CBM) complex\"\n    ],\n    \"partners\": [\n      \"SLP76\",\n      \"SKAP55\",\n      \"FYN\",\n      \"NCK1\",\n      \"RIAM\",\n      \"WASP\",\n      \"ZAP70\",\n      \"CARMA1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}