{"gene":"SH2B3","run_date":"2026-06-10T07:46:31","timeline":{"discoveries":[{"year":1995,"finding":"LNK (Lnk) becomes tyrosine phosphorylated upon T-cell receptor and CD4 crosslinking, and co-immunoprecipitates with phospholipase C-γ1, phosphatidylinositol 3-kinase, and Grb2 in activated T lymphocytes, linking TCR activation signals to these downstream pathways.","method":"Co-immunoprecipitation from activated T lymphocytes","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP study, foundational but from a single lab with one primary method","pmids":["8524815"],"is_preprint":false},{"year":1997,"finding":"Mouse Lnk is tyrosine phosphorylated during T cell activation, but transgenic overexpression in thymocytes demonstrated it plays no limiting role in TCR signaling, suggesting Lnk participates in signaling from receptors other than antigen receptors.","method":"Transgenic mouse overexpression, T cell activation assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic mouse model with functional readout, single lab","pmids":["9169414"],"is_preprint":false},{"year":2000,"finding":"Human LNK is localized at the juxtanuclear compartment and plasma membrane; it is tyrosine phosphorylated by p56lck, which then binds to phospho-LNK through its SH2 domain; LNK associates with tyrosine-phosphorylated TCR zeta-chain via its SH2 domain; overexpression of LNK in Jurkat cells inhibits anti-CD3-mediated NF-AT activation.","method":"Confocal fluorescence microscopy (GFP fusion), co-immunoprecipitation in COS cells, NF-AT luciferase reporter assay in Jurkat cells","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (localization, Co-IP, functional reporter), single lab","pmids":["10799879"],"is_preprint":false},{"year":2000,"finding":"LNK deficiency in mice causes expansion of B lineage cells and hypersensitivity of pro-B cell precursors to SCF (c-Kit ligand), establishing LNK as a negative regulator of B cell production downstream of c-Kit signaling.","method":"Lnk knockout mouse generation, bone marrow analysis, B cell precursor culture with SCF","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with defined cellular phenotype, replicated by multiple labs","pmids":["11114373"],"is_preprint":false},{"year":2000,"finding":"Human LNK binds to the C-terminal segment (repeats 19-23C, residues 2006-2454) of actin-binding protein ABP-280 (filamin A) via a 56-amino acid interdomain region between its PH and SH2 domains; this interaction was confirmed by co-immunoprecipitation of endogenous proteins in Jurkat cells and co-localization at plasma membrane and juxtanuclear region.","method":"Yeast two-hybrid screen, co-immunoprecipitation, confocal immunofluorescence","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus reciprocal Co-IP with endogenous proteins, single lab","pmids":["11163396"],"is_preprint":false},{"year":2002,"finding":"Lnk-deficient mice display expanded hematopoietic progenitors with hypersensitivity to multiple cytokines including IL-3, IL-7, and stem cell factor, and Lnk inactivation causes abnormal modulation of IL-3 and SCF-mediated signaling pathways; Lnk is highly expressed in multipotent cells and committed erythroid, megakaryocyte, and myeloid precursors.","method":"Lnk knockout mouse generation, in vitro proliferation assays, cytokine signaling (Western blot), expression profiling","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with multiple cytokine pathways tested, replicated by independent lab","pmids":["12070287"],"is_preprint":false},{"year":2002,"finding":"Lnk is phosphorylated by and associates with c-Kit following SCF stimulation; Lnk deficiency enhances c-Kit-mediated signaling and selectively inhibits phosphorylation of Gab2 and activation of the MAPK cascade downstream of c-Kit.","method":"Co-immunoprecipitation, Western blot signaling analysis in Lnk-/- hematopoietic progenitors","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with knockout comparison, single lab, two orthogonal methods","pmids":["11805142"],"is_preprint":false},{"year":2004,"finding":"Lnk overexpression negatively regulates Tpo-mediated megakaryocyte proliferation and endomitosis; Lnk deficiency causes enhanced STAT3, STAT5, Akt, and MAPK signaling in response to Tpo; the SH2 domain of Lnk is essential for its inhibitory function, whereas the conserved C-terminal tyrosine is dispensable and the PH domain contributes but is not essential.","method":"Lnk overexpression and knockout in hematopoietic cell lines and primary cells, Western blot signaling analysis, domain mutant analysis","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout plus domain mutagenesis, multiple signaling readouts, replicated observations","pmids":["15337790"],"is_preprint":false},{"year":2005,"finding":"Lnk negatively modulates EpoR signaling by attenuating JAK2 activation; wild-type Lnk becomes tyrosine phosphorylated following Epo administration and inhibits EpoR phosphorylation; the Lnk SH2 domain is essential for inhibitory function, blocking STAT5, Akt, and MAPK pathways in primary erythroblasts; the conserved C-terminal tyrosine and PH domain are not critical for this inhibition.","method":"Lnk overexpression in 32D/EpoR cells and primary fetal liver erythroblasts, Western blot for JAK2/EpoR/STAT5/Akt/MAPK phosphorylation, SH2 domain mutant analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (overexpression, domain mutagenesis, primary cell signaling), mechanistic depth","pmids":["15705783"],"is_preprint":false},{"year":2006,"finding":"Lnk regulates postnatal HSC expansion antagonistically to thrombopoietin; Lnk-/- HSCs display enhanced THPO responsiveness and their postnatal expansion is completely dependent on THPO, as Lnk-/-Thpo-/- double knockout mice have 65-fold fewer LT-HSCs than Lnk-/- mice.","method":"Genetic double knockout (Lnk-/-Thpo-/-), HSC quantification, competitive repopulation","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis via double knockout, clean phenotypic readout","pmids":["16882979"],"is_preprint":false},{"year":2006,"finding":"In endothelial cells, Lnk down-regulates TNF-α-induced VCAM-1 and E-selectin expression by activating PI3K/Akt signaling and inhibiting ERK1/2 phosphorylation, without affecting NF-κB p65 phosphorylation/translocation or IκBα degradation; endothelial nitric oxide synthase and HO-1 are identified as downstream targets of Lnk-mediated PI3K/Akt activation.","method":"Lnk overexpression in endothelial cells, Western blot for VCAM-1/E-selectin/NF-κB/Akt/ERK/p38/JNK, PI3K inhibitor treatment","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — overexpression with multiple pathway readouts and inhibitor validation, single lab","pmids":["16644735"],"is_preprint":false},{"year":2007,"finding":"Lnk negatively regulates the activating MPL mutation MPLW515L; Lnk associates with activated wild-type MPL and MPLW515L at the plasma membrane; the Lnk SH2 domain is essential for binding and down-regulation; MPLW515L-expressing cells are more susceptible to Lnk inhibitory function than MPL wild-type cells; Lnk is tyrosine phosphorylated following TPO stimulation.","method":"Co-immunoprecipitation, confocal colocalization, overexpression/knockdown in Ba/F3-MPLW515L and UT7-MPLW515L cells, proliferation assays, Western blot","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus functional knockdown/overexpression, single lab","pmids":["17693582"],"is_preprint":false},{"year":2007,"finding":"Lnk negatively regulates HSC self-renewal specifically through the TPO/Mpl pathway; Lnk-/- HSCs show enhanced TPO-mediated STAT5 activation (but not p38 inactivation in WT HSCs), and symmetrical self-renewal division is efficiently induced by TPO+SCF only in Lnk-deficient HSCs.","method":"Single-cell cultures, competitive repopulation, single-cell transplantation, single-cell immunostaining for p38/STAT5/Akt","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (single-cell assays, transplantation), mechanistic signal pathway mapping","pmids":["17284614"],"is_preprint":false},{"year":2008,"finding":"Lnk directly binds to phosphorylated tyrosine residues in JAK2 following TPO stimulation; Lnk controls HSC quiescence and self-renewal predominantly through Mpl signaling; the JAK2 V617F mutant retains the ability to bind Lnk; an activated JAK2 mutant unable to bind Lnk causes greater myeloid expansion and accelerated myelofibrosis.","method":"Co-immunoprecipitation (biochemical binding), genetic epistasis (Lnk-/- × Mpl-/- mice), bone marrow transplantation, 5-FU treatment, cell cycle analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct biochemical binding plus genetic epistasis plus structure-function (binding-deficient mutant), multiple orthogonal methods","pmids":["18618018"],"is_preprint":false},{"year":2008,"finding":"The Lnk SH2 domain binds directly and preferentially to phosphorylated tyrosine 567 in the c-Kit juxtamembrane domain; this binding is abolished by Y568F point mutation (rat c-Kit numbering Y567) and competed by phosphopeptides; Lnk down-regulates SCF-induced MAPK and JNK signaling but not PI3K signaling in mast cells, and inhibits SCF-dependent migration via Rac and p38 MAPK.","method":"GST pull-down with c-Kit domain constructs, co-immunoprecipitation with Y568F mutant, Lnk-/- bone marrow mast cells reconstituted with Lnk mutants, proliferation/migration assays, Western blot","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro binding (GST pull-down + mutagenesis) plus functional reconstitution in primary cells, two orthogonal methods","pmids":["18753636"],"is_preprint":false},{"year":2008,"finding":"Lnk associates with c-Kit phospho-Tyr568 in the juxtamembrane domain; binding is abolished by the Y568F mutation and competed by phospho-Tyr568 peptides; Lnk binds directly to c-Kit without requiring other interacting partners, as shown by pull-down with GST-fusion proteins.","method":"GST pull-down with c-Kit domain constructs, co-immunoprecipitation with Y568F mutant c-Kit, peptide competition assay","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro direct binding reconstitution with mutagenesis and peptide competition, confirms prior finding independently","pmids":["18588518"],"is_preprint":false},{"year":2008,"finding":"Lnk regulates integrin alphaIIbbeta3 outside-in signaling in platelets; Lnk-/- platelets show reduced spreading on fibrinogen, reduced clot retraction, reduced tyrosine phosphorylation of the beta3 integrin subunit, and reduced binding of Fyn to integrin alphaIIbbeta3, leading to impaired thrombus stabilization in vivo.","method":"In vivo thrombosis models (FeCl3 and laser injury with live imaging), platelet spreading assay, clot retraction assay, co-immunoprecipitation of Fyn with integrin alphaIIbbeta3, Western blot for beta3 phosphorylation","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (in vivo imaging, biochemical Co-IP, functional spreading/retraction assays), genetic normalization of platelet counts","pmids":["20038804"],"is_preprint":false},{"year":2009,"finding":"Lnk inhibits JAK2V617F constitutive activity; Lnk, through its SH2 and PH domains, interacts with both wild-type JAK2 and JAK2V617F; Lnk is tyrosine phosphorylated by constitutively active JAK2V617F; Lnk-deficient murine bone marrow cells are significantly more sensitive to transformation by JAK2V617F in CFU assays.","method":"Co-immunoprecipitation, Ba/F3-EpoR proliferation assay, Lnk-/- bone marrow CFU assay with JAK2V617F, Western blot","journal":"Journal of leukocyte biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus primary cell functional assay, single lab","pmids":["19293402"],"is_preprint":false},{"year":2010,"finding":"Lnk deficiency accelerates and exacerbates oncogenic JAK2-induced myeloproliferative disease; an activated form of JAK2 unable to bind Lnk causes greater myeloid expansion and accelerated myelofibrosis, demonstrating that Lnk directly inhibits oncogenic JAK2 in constraining MPD; Lnk deficiency also cooperates with BCR/ABL (which does not directly interact with Lnk) in CML-like disease development.","method":"Bone marrow transplantation with JAK2-activated mutants lacking Lnk binding, Lnk-/- mouse models, genetic double mutant analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — structure-function (binding-deficient JAK2 mutant) plus genetic epistasis in vivo, multiple disease models","pmids":["20458146"],"is_preprint":false},{"year":2010,"finding":"Disease-associated LNK mutations (5bp deletion/missense causing truncation, and E208Q missense in PH domain) impair LNK function; BaF3-MPL cells transduced with these LNK mutants display augmented and sustained thrombopoietin-dependent growth and JAK-STAT signaling.","method":"Retroviral transduction of LNK mutants in BaF3-MPL cells, proliferation assays, JAK-STAT signaling by phosphoflow/Western blot, primary patient CD34+ progenitor analysis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reconstitution with patient-derived mutants in cell lines, single lab","pmids":["20404132"],"is_preprint":false},{"year":2010,"finding":"Carriers of the SH2B3 rs3184504*A (R262W) risk allele show stronger activation of the NOD2 recognition pathway in response to lipopolysaccharide and muramyl dipeptide, suggesting LNK plays a role in innate immune signaling against bacteria.","method":"Ex vivo stimulation of peripheral blood cells from genotyped donors, cytokine/NOD2 pathway activation assays","journal":"American journal of human genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — functional assay in primary cells stratified by genotype, single study, indirect mechanism","pmids":["20560212"],"is_preprint":false},{"year":2011,"finding":"LNK (SH2B3) is expressed in endothelial cells and localizes to focal adhesions (co-distributing with vinculin); LNK inhibition decreases cell spreading while sustained expression increases focal adhesion number; LNK regulates beta1-integrin-mediated Akt and GSK3β signaling; alpha-parvin is a molecular target of LNK responsible for impaired focal adhesion dynamics; ILK is identified as a new molecular partner for LNK, which regulates alpha-parvin expression through ILK interaction.","method":"RNA interference, immunofluorescence localization, co-immunoprecipitation identifying ILK and alpha-parvin as partners, cell spreading and migration assays, Western blot","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus RNAi functional assays plus localization, single lab, multiple methods","pmids":["22441983"],"is_preprint":false},{"year":2011,"finding":"SH2B3 binds to and inhibits neurite outgrowth by binding to phosphorylated TrkA (NGF receptor) via its SH2 domain; SH2B3 represses NGF-induced PLCγ, MEK-ERK1/2, and PI3K-AKT pathway activation and Egr-1 expression; SH2B3 reduces the interaction between SH2B1β and TrkA, competing with positive-acting family members.","method":"Overexpression in PC12 cells and primary cortical neurons, Western blot for PLCγ/ERK/AKT/Egr-1, neurite outgrowth assays, co-immunoprecipitation of TrkA with SH2B3/SH2B1β","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple signaling pathway readouts with domain mutants (SH2 domain sufficient), Co-IP, single lab","pmids":["22028877"],"is_preprint":false},{"year":2012,"finding":"14-3-3 proteins bind to LNK at two serine phosphorylation sites (phosphorylated by GSK3 and PKA kinases); 14-3-3 binding interferes with the LNK-JAK2 interaction, alleviating LNK inhibition of JAK2 signaling; 14-3-3 binding sequesters LNK in the cytoplasm away from the plasma membrane-proximal JAK2; mutations of these serine residues abrogated 14-3-3 binding and augmented LNK's growth inhibitory function.","method":"Co-immunoprecipitation, kinase assays (GSK3/PKA), subcellular fractionation, mutagenesis of LNK serine sites, bone marrow transplantation, cell proliferation assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, kinase assay, localization, mutagenesis, in vivo transplant), single lab but mechanistically comprehensive","pmids":["22546852"],"is_preprint":false},{"year":2012,"finding":"Lnk binds to FLT3 and FLT3-ITD through its SH2 domain; the phosphorylated tyrosines 572, 591, and 919 of FLT3 are involved in direct binding to Lnk; Lnk is phosphorylated by both FL-activated FLT3-WT and constitutively active FLT3-ITD; Lnk suppresses FLT3-WT/ITD-dependent signaling and cell proliferation.","method":"Co-immunoprecipitation, SH2 domain mutant analysis, shRNA depletion and overexpression in 32D cells, Lnk-/- primary bone marrow FL stimulation assay","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with site mapping plus functional knockdown/overexpression, single lab","pmids":["22942183"],"is_preprint":false},{"year":2013,"finding":"Loss of SH2B3 increases JAK-STAT signaling, promotes lymphoid cell proliferation, and accelerates leukemia development in a mouse model of NOTCH1-induced ALL; combined loss of Lnk and Tp53 or Ink4a/Arf triggers transplantable precursor B-ALL with gene expression profiles similar to human Ph-like B-ALL.","method":"Genetic mouse models (Lnk-/- combined with tumor suppressor knockouts), bone marrow transplantation, gene expression profiling, JAK-STAT signaling Western blot","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in multiple mouse models with transplantation and molecular readouts","pmids":["23908464"],"is_preprint":false},{"year":2013,"finding":"SH2B3 (LNK) PH domain missense mutations from MPN patients show mild loss of function against wild-type JAK2 and JAK2V617F but retain binding capacity for JAK2, 14-3-3, and CBL adaptors; no dominant-negative effect was observed.","method":"Co-immunoprecipitation of JAK2/14-3-3/CBL with PH domain mutants, signaling assays in transfected cells","journal":"British journal of haematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding partners tested with domain mutants, single lab","pmids":["23590807"],"is_preprint":false},{"year":2013,"finding":"Lnk suppresses IL-11 signaling in HSPCs by inhibiting tyrosine phosphorylation of SHP-2/PTPN11 and its association with Grb2, and attenuating Erk MAP kinase activation; SHP-2 contains a binding motif for the Lnk SH2 domain that is phosphorylated in response to IL-11 stimulation.","method":"Co-immunoprecipitation of SHP-2/Grb2 with Lnk, Western blot for Erk activation, Lnk-/- HSPC radiation resistance assays, IL-11 stimulation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with mechanistic pathway mapping in primary cells, single lab","pmids":["24297922"],"is_preprint":false},{"year":2015,"finding":"Loss of LNK in hematopoietic cells (established by bone marrow transplantation) is primarily responsible for angiotensin II-induced renal and vascular inflammation and predisposition to hypertension; Ang II infusion increases IFN-γ-producing CD8+ T cells in Lnk-/- mice, and IFN-γ deficiency blunts the hypertensive response.","method":"Bone marrow transplantation, angiotensin II infusion model, IFN-γ KO epistasis, flow cytometry for CD8+ T cells, renal/vascular histology","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — bone marrow transplantation establishing hematopoietic cell causality plus IFN-γ genetic epistasis, two orthogonal approaches","pmids":["25664851"],"is_preprint":false},{"year":2016,"finding":"LNK regulates pro-B progenitor homeostasis by attenuating IL-7-stimulated JAK/STAT5 signaling via a direct interaction with phosphorylated JAK3; combined Lnk and Tp53 deficiency triggers B-ALL sensitive to JAK inhibitors.","method":"Co-immunoprecipitation of LNK with phospho-JAK3, JAK inhibitor treatment of Lnk-/-Tp53-/- leukemia transplants, IL-7 hypersensitivity assays, gene expression profiling","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishing direct JAK3 binding plus functional inhibitor studies, single lab","pmids":["26974155"],"is_preprint":false},{"year":2016,"finding":"LNK R262W (TT genotype) is a loss-of-function variant associated with expanded hematopoietic stem cells and enhanced megakaryopoiesis via increased MPL signaling in human cord blood; in Lnk-deficient mice, platelet LNK deficiency increases MPL signaling and AKT activation; hypercholesterolemia acts synergistically with LNK deficiency via SHIP-1 dephosphorylation to further increase AKT and platelet activation.","method":"Human cord blood HSC expansion assays, mouse bone marrow transplantation atherosclerosis/thrombosis models, Western blot for Akt/SHIP-1 phosphorylation, platelet activation assays","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional endpoints in human cord blood and mouse models, single lab","pmids":["27430239"],"is_preprint":false},{"year":2018,"finding":"Lnk deficiency stabilizes stalled replication forks (in a manner partially dependent on alleviating blocks to cytokine-mediated JAK2 signaling) in Fancd2-/- HSCs, reducing replication stress and genomic instability, without impacting ICL repair; this restores HSC function in Fanconi anemia.","method":"Genetic double knockout (Lnk-/-Fancd2-/-), DNA fiber assays for fork stability, JAK2 signaling Western blot, HSC reconstitution transplantation, ICL repair assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (DNA fiber, genetic epistasis, transplantation), novel mechanistic link between JAK2 signaling and replication fork stability","pmids":["30254368"],"is_preprint":false},{"year":2018,"finding":"Lnk/Sh2b3 controls adipose tissue homeostasis by negatively regulating IL-15-dependent group 1 innate lymphoid cells (G1-ILCs); Lnk-/- mice have impaired glucose tolerance and accumulation of G1-ILCs in adipose tissue; crossing with Il15-/- mice or depleting G1-ILCs (but not CD8+ T cells) ameliorates glucose intolerance; JAK inhibition improves glucose tolerance in Lnk-/- mice.","method":"Lnk-/- × Il15-/- double knockout, cell depletion (anti-NK1.1), JAK inhibitor treatment, flow cytometry, glucose tolerance tests","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (double KO) plus cell depletion plus pharmacological inhibition, multiple orthogonal approaches","pmids":["30110639"],"is_preprint":false},{"year":2019,"finding":"LNK suppresses interferon-STAT1 signaling in melanoma; forced LNK expression inhibits IFN-induced STAT1 signaling, cell cycle arrest, and apoptosis; melanoma cells exposed to IFN upregulate LNK expression as a negative feedback mechanism; silencing LNK potentiates IFN-mediated cell killing.","method":"LNK overexpression and shRNA/CRISPR-Cas9 knockdown in melanoma cells, Western blot for STAT1 signaling, cell cycle and apoptosis assays, IFN stimulation","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with mechanistic pathway readouts, single lab","pmids":["31110180"],"is_preprint":false},{"year":2021,"finding":"Crystal structures of the LNK SH2 domain bound to phosphorylated motifs from JAK2 and EPOR reveal a canonical SH2 fold with an additional N-terminal helix; specificity is conferred by amino acids one and three residues downstream of the phosphotyrosine; disease-associated LNK mutations show impaired target binding in vitro and reduced ability to inhibit signaling.","method":"X-ray crystallography (two structures: LNK-SH2/phospho-JAK2 and LNK-SH2/phospho-EPOR), biochemical binding assays, mutagenesis functional signaling assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures with biochemical binding characterization and mutagenesis functional validation, rigorous multi-method study","pmids":["34671038"],"is_preprint":false},{"year":2021,"finding":"Hematopoietic Lnk deficiency promotes arterial thrombosis via a NETosis mechanism dependent on oxidized phospholipids (OxPL); Lnk-deficient platelets release more OxPL upon thrombin activation and Lnk-deficient neutrophils show increased priming and response to OxPL; PAD4 deficiency completely reversed accelerated thrombosis, and E06-scFv targeting OxPL reversed NETosis, atherosclerosis, and thrombosis.","method":"Lnk-/-PAD4-/- double knockout, E06-scFv transgene, carotid artery thrombosis model, OxPL measurement from platelets, NETosis assays, human iPSC-derived LNK(TT) cells","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (double KO) plus transgenic rescue plus human iPSC validation, multiple orthogonal approaches","pmids":["34846914"],"is_preprint":false},{"year":2022,"finding":"SH2B3 binds to JAK2 and SHP2 to suppress JAK2/STAT3 and SHP2/Grb2/PI3K/AKT signaling pathways in lung cancer cells, inhibiting anoikis resistance, proliferation, migration, invasion, and EMT; TGF-β1 promotes these processes by reducing SH2B3 expression.","method":"Co-immunoprecipitation of SH2B3 with JAK2 and SHP2, SH2B3 overexpression in lung cancer lines, Western blot for JAK2/STAT3/Grb2/PI3K/AKT phosphorylation, in vivo xenograft","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for two binding partners plus functional overexpression with signaling readouts, single lab","pmids":["35589677"],"is_preprint":false},{"year":2022,"finding":"The SH2B3 R262W (Trp/Trp) variant exhibits less negative regulation of IL-12 signaling, resulting in enhanced IL-12-induced Stat4 phosphorylation and IFN-γ production in CD8+ T cells, leading to exacerbated hypertension and renal injury following angiotensin II infusion.","method":"CRISPR-Cas9 knock-in mice (Arg/Arg vs. Trp/Trp), angiotensin II infusion model, Stat4 phosphorylation Western blot, IFN-γ ELISA from ex vivo stimulated T cells, blood pressure telemetry","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR knock-in of precise human variant with mechanistic signaling readout plus in vivo phenotype, multiple orthogonal methods","pmids":["36169218"],"is_preprint":false},{"year":2024,"finding":"Eosinophil-specific Lnk deficiency (LnkΔeos mice) causes isolated eosinophilia with increased eosinophil activation and JAK/STAT signaling, accelerating arterial thrombosis through eosinophil extracellular trap (EETosis) formation; DNase I infusion abolishing EETs and NETs reversed the accelerated thrombosis; human iPSC-derived LNK(TT) eosinophils showed increased activation and EETosis.","method":"Conditional eosinophil-specific Lnk knockout (eoCre×Lnkf/f), carotid artery thrombosis model, anti-Siglec-F eosinophil depletion, DNase I treatment, human iPSC-derived eosinophil assays, flow cytometry for JAK/STAT signaling","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO plus depletion plus pharmacological rescue plus human iPSC validation, multiple orthogonal approaches","pmids":["38096361"],"is_preprint":false},{"year":2011,"finding":"Lnk binds to PDGFR-α, PDGFR-β, and the leukemogenic FIP1L1-PDGFRA fusion protein after PDGF exposure; deletion/mutation of the Lnk SH2 domain completely abolishes binding to FIP1L1-PDGFRA (but only partly prevents PDGFRA/B binding); Lnk inhibits PDGF-dependent proliferation and Erk phosphorylation, and suppresses growth of FIP1L1-PDGFRA- and TEL-PDGFRB-transformed 32D cells.","method":"Co-immunoprecipitation in 293T cells with SH2 mutants, Ba/F3 and 32D cell proliferation assays, Western blot for pErk","journal":"Experimental hematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mutants plus functional proliferation assays, single lab","pmids":["21310211"],"is_preprint":false},{"year":2010,"finding":"Lnk inhibits c-Fms (M-CSFR) signaling; Lnk binds to c-Fms; Lnk deficiency increases M-CSF-induced Akt phosphorylation (augmented and prolonged) while diminishing Erk phosphorylation, enhances ROS production, and inhibits M-CSF-induced macrophage migration.","method":"Co-immunoprecipitation of Lnk with c-Fms, Western blot for Akt/Erk in Lnk-/- vs. WT macrophages, clonogenic (M-CFU) assay, ROS production assay, migration assay","journal":"Journal of leukocyte biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus multiple functional readouts in primary knockout cells, single lab","pmids":["20571037"],"is_preprint":false},{"year":2011,"finding":"LNK is expressed in neural stem and progenitor cells (NSPCs) in adult mouse and human SVZ; Lnk deficiency increases NSPC proliferation after stroke but not in intact brain; Lnk expression after stroke is upregulated through STAT1/3 transcription factors; LNK attenuates IGF-1 signaling by inhibiting AKT phosphorylation, reducing NSPC proliferation.","method":"Lnk-/- mouse stroke model, BrdU/EdU incorporation for proliferation, LNK overexpression in NSPC cultures, Western blot for AKT phosphorylation, STAT1/3 ChIP/reporter analysis","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO plus overexpression plus mechanistic signaling readout (AKT), single lab","pmids":["22496561"],"is_preprint":false},{"year":2011,"finding":"TPO-stimulated Lnk-deficient HSCs show enhanced Bcl-xL expression compared to normal HSCs; Bcl-xL downregulation by shRNA in Lnk-deficient HSCs reduces their reconstitution capacity; Lnk constrains Bcl-xL expression and thereby controls HSC apoptosis and survival downstream of TPO signaling.","method":"Western blot for Bcl-xL in Lnk-/- vs. WT HSCs, shRNA knockdown of Bcl-xL in Lnk-/- HSCs, competitive reconstitution transplantation, irradiation survival assay","journal":"Experimental hematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — shRNA functional epistasis plus transplantation readout, single lab","pmids":["22101255"],"is_preprint":false}],"current_model":"SH2B3 (LNK) is an intracellular adaptor protein that functions as a broad negative regulator of JAK-STAT and receptor tyrosine kinase signaling in hematopoietic, endothelial, immune, and other cell types: its SH2 domain binds directly to phosphorylated tyrosine residues on activated JAK2 (pY residues), JAK3, EPOR, c-Kit (pY568), c-Mpl, FLT3 (pY572/591/919), c-Fms, PDGFR, and TrkA, attenuating downstream STAT, PI3K/AKT, MAPK/ERK, and Rac/p38 signaling; 14-3-3 proteins phosphorylated at LNK serine sites (by GSK3/PKA) compete with JAK2 for LNK binding and sequester LNK away from the membrane, providing a positive feedback release of LNK inhibition; crystal structures reveal the LNK SH2 domain adopts a canonical fold with an N-terminal helix, and specificity is conferred by residues +1 and +3 relative to phosphotyrosine; the PH domain contributes to membrane targeting and some interactions; disease-associated mutations in the PH and SH2 domains impair target binding and signaling inhibition, leading to myeloproliferative neoplasms, ALL, and autoimmunity."},"narrative":{"mechanistic_narrative":"SH2B3 (LNK) is an intracellular adaptor protein that acts as a broad negative regulator of cytokine receptor and receptor tyrosine kinase signaling across hematopoietic, endothelial, immune, vascular, and neural cell types, dampening proliferative and inflammatory outputs downstream of these receptors [PMID:12070287, PMID:15705783, PMID:23908464]. Its SH2 domain is the essential effector module: it binds directly to specific phosphotyrosine motifs on activated JAK2 and EPOR [PMID:18618018, PMID:34671038], JAK3 [PMID:26974155], c-Kit pTyr568 [PMID:18753636, PMID:18588518], MPL [PMID:17693582], FLT3/FLT3-ITD at pTyr572/591/919 [PMID:22942183], PDGFRs and the FIP1L1-PDGFRA fusion [PMID:21310211], and the phosphatase SHP2 [PMID:24297922], thereby attenuating downstream STAT5/STAT3, PI3K/AKT, and MAPK/ERK signaling [PMID:15337790, PMID:15705783]. Crystal structures of the LNK SH2 domain bound to phospho-JAK2 and phospho-EPOR motifs reveal a canonical SH2 fold with an additional N-terminal helix, with binding specificity conferred by the residues at the +1 and +3 positions relative to the phosphotyrosine [PMID:34671038]. LNK function is itself tuned by phosphorylation: GSK3- and PKA-phosphorylated serine sites recruit 14-3-3 proteins that compete with JAK2 and sequester LNK in the cytoplasm, relieving its inhibition of signaling [PMID:22546852]. Through these activities LNK restrains hematopoietic stem cell self-renewal and progenitor expansion in a thrombopoietin/MPL-dependent manner [PMID:16882979, PMID:17284614, PMID:18618018] and constrains B-lineage and myeloid output [PMID:11114373, PMID:12070287]. Loss or mutation of LNK augments JAK-STAT signaling and drives disease: it accelerates oncogenic JAK2-induced myeloproliferative neoplasms and cooperates with tumor suppressor loss to produce B-ALL [PMID:20458146, PMID:23908464, PMID:26974155], and patient-derived PH- and SH2-domain mutations impair target binding and signaling inhibition [PMID:20404132, PMID:34671038]. The R262W (rs3184504) risk variant is a loss-of-function allele that enhances cytokine-driven T-cell responses and predisposes to hypertension and renal injury [PMID:36169218], and hematopoietic LNK deficiency promotes vascular inflammation, atherosclerosis, and arterial thrombosis through NETosis/EETosis mechanisms [PMID:25664851, PMID:34846914, PMID:38096361].","teleology":[{"year":1995,"claim":"Established LNK as a tyrosine-phosphorylated adaptor coupling receptor activation to downstream signaling enzymes, the first hint of its scaffolding role.","evidence":"Co-immunoprecipitation of LNK with PLC-γ1, PI3K, and Grb2 in activated T lymphocytes","pmids":["8524815"],"confidence":"Medium","gaps":["Direct vs. indirect nature of associations not resolved","No receptor target identified","Functional consequence of associations untested"]},{"year":1997,"claim":"Redirected attention from antigen receptors to other receptor systems by showing LNK is not rate-limiting in TCR signaling despite TCR-induced phosphorylation.","evidence":"Transgenic thymocyte overexpression with T cell activation assays in mice","pmids":["9169414"],"confidence":"Medium","gaps":["Did not identify the relevant non-antigen receptors","Loss-of-function not yet tested"]},{"year":2000,"claim":"Genetic knockout defined LNK's core physiological function as a negative regulator of hematopoietic cell production downstream of c-Kit, moving beyond correlative biochemistry.","evidence":"Lnk knockout mice with B-cell precursor expansion and SCF hypersensitivity; parallel TCR ζ-chain/p56lck association and NF-AT reporter studies","pmids":["11114373","10799879"],"confidence":"High","gaps":["Direct receptor-binding mechanism not yet shown","Domain requirements undefined"]},{"year":2002,"claim":"Broadened LNK's negative regulatory scope across multiple cytokines and mapped its action to specific receptors and effectors, defining it as a multi-pathway brake on progenitor signaling.","evidence":"Lnk knockout progenitor cytokine hypersensitivity (IL-3, IL-7, SCF) and c-Kit association with selective Gab2/MAPK suppression","pmids":["12070287","11805142"],"confidence":"High","gaps":["Direct phosphotyrosine binding sites not yet mapped","SH2 domain requirement not yet isolated"]},{"year":2004,"claim":"Isolated the SH2 domain as the essential inhibitory module and the C-terminal tyrosine/PH domain as dispensable, defining the structural logic of LNK inhibition of TPO/MPL signaling.","evidence":"Domain-mutant overexpression and knockout signaling analysis (STAT3/5, Akt, MAPK) in megakaryocytic cells","pmids":["15337790"],"confidence":"High","gaps":["Direct phosphotyrosine target of the SH2 domain not yet identified","PH domain contribution not fully resolved"]},{"year":2005,"claim":"Pinpointed JAK2 as the proximal target in EPOR signaling, showing LNK attenuates JAK2 activation through its SH2 domain.","evidence":"SH2-mutant analysis in EpoR cells and primary erythroblasts with JAK2/EpoR/STAT5/Akt/MAPK phospho-readouts","pmids":["15705783"],"confidence":"High","gaps":["Direct LNK–JAK2 binding not yet demonstrated biochemically","Phosphotyrosine motif unmapped"]},{"year":2006,"claim":"Genetic epistasis established that LNK's control of HSC expansion operates specifically through the thrombopoietin axis, linking the molecular brake to a stem-cell-level phenotype.","evidence":"Lnk-/-Thpo-/- double knockout HSC quantification and competitive repopulation; endothelial TNF-α/VCAM-1 studies","pmids":["16882979","16644735"],"confidence":"High","gaps":["Whether LNK acts directly on MPL or on JAK2 not yet distinguished","Endothelial mechanism distinct from hematopoietic"]},{"year":2007,"claim":"Mapped LNK action to MPL/STAT5 in HSC self-renewal and showed it directly engages activated MPL including the oncogenic W515L mutant, foreshadowing its tumor-suppressive role.","evidence":"Single-cell HSC assays, transplantation, and Co-IP/colocalization of LNK with MPL and MPLW515L","pmids":["17284614","17693582"],"confidence":"High","gaps":["Oncogenic mutants more susceptible to LNK — mechanism unexplained","Direct phosphotyrosine site on MPL/JAK2 not defined"]},{"year":2008,"claim":"Demonstrated direct SH2-mediated binding of LNK to specific phosphotyrosines — JAK2 pY residues and c-Kit pTyr568 — establishing the molecular interaction underlying its inhibition, and showed an oncogenic JAK2 mutant uncoupled from LNK drives worse disease.","evidence":"Co-IP and genetic epistasis for JAK2 (Lnk-/-×Mpl-/-, binding-deficient JAK2 mutant); GST pull-downs with Y568F mutagenesis and peptide competition for c-Kit; platelet integrin/Fyn studies","pmids":["18618018","18753636","18588518","20038804"],"confidence":"High","gaps":["Structural basis of phosphotyrosine recognition not yet resolved","Generality of motif across receptors untested"]},{"year":2010,"claim":"Established LNK as a genuine tumor suppressor restraining oncogenic JAK2 and revealed patient-derived PH/SH2 mutations as loss-of-function lesions, while extending LNK binding to additional RTKs.","evidence":"Bone marrow transplantation with Lnk-uncoupled JAK2 mutants, patient mutant reconstitution in BaF3-MPL cells, c-Fms Co-IP, R262W genotype-stratified NOD2 assays","pmids":["20458146","20404132","20571037","20560212"],"confidence":"High","gaps":["Quantitative binding effects of mutations not measured","R262W mechanism remained correlative at this stage"]},{"year":2011,"claim":"Extended LNK's negative regulatory reach to PDGFRs, TrkA, focal adhesion machinery, and neural progenitors, defining it as a broadly acting adaptor across cell lineages.","evidence":"SH2-mutant Co-IP for PDGFR/FIP1L1-PDGFRA, TrkA Co-IP and neurite assays, focal-adhesion Co-IP (ILK, alpha-parvin), NSPC stroke model with IGF-1/AKT readout","pmids":["21310211","22028877","22441983","22496561"],"confidence":"Medium","gaps":["Several interactions rest on single-lab Co-IP","Direct vs. indirect binding to focal adhesion partners unresolved"]},{"year":2012,"claim":"Identified the regulatory switch controlling LNK itself: 14-3-3 binding at GSK3/PKA-phosphorylated serines competes with JAK2 and sequesters LNK from the membrane, providing feedback release of inhibition.","evidence":"Co-IP, GSK3/PKA kinase assays, subcellular fractionation, serine-site mutagenesis, and bone marrow transplantation","pmids":["22546852"],"confidence":"High","gaps":["Physiological stimuli driving GSK3/PKA phosphorylation of LNK undefined","Quantitative competition kinetics not measured"]},{"year":2013,"claim":"Cemented LNK as a leukemia suppressor whose loss synergizes with NOTCH1 and tumor-suppressor lesions to drive ALL, and mapped SHP2/PTPN11 as an SH2 target in IL-11 signaling.","evidence":"Lnk-/- combined tumor-suppressor mouse models with transplantation and expression profiling; SHP-2/Grb2 Co-IP in HSPCs; PH-mutant binding panels","pmids":["23908464","24297922","23590807"],"confidence":"High","gaps":["Mild PH-mutant phenotypes left their disease contribution uncertain","SHP2 binding motif not crystallographically resolved"]},{"year":2016,"claim":"Defined JAK3/IL-7 as an additional direct SH2 target in B-lineage homeostasis and showed LNK-deficient leukemias are JAK-inhibitor sensitive, linking mechanism to therapy, while clarifying the R262W variant as a quantitative loss-of-function allele driving thrombosis-relevant MPL signaling.","evidence":"Phospho-JAK3 Co-IP and JAK inhibitor treatment of Lnk-/-Tp53-/- leukemias; human cord blood HSC and mouse platelet/SHIP-1 studies of R262W","pmids":["26974155","27430239"],"confidence":"Medium","gaps":["Direct JAK3 binding rests on single Co-IP","Synergy with hypercholesterolemia mechanistically incomplete"]},{"year":2018,"claim":"Revealed non-canonical and tissue-specific roles: LNK loss stabilizes stalled replication forks via JAK2 signaling in Fanconi anemia HSCs and controls adipose immune homeostasis and glucose tolerance through IL-15-dependent innate lymphoid cells.","evidence":"Lnk-/-Fancd2-/- DNA fiber assays and transplantation; Lnk-/-×Il15-/- double knockout, ILC depletion, and JAK inhibitor glucose tolerance tests","pmids":["30254368","30110639"],"confidence":"High","gaps":["Mechanistic link between JAK2 signaling and fork stability incompletely defined","Cell-intrinsic vs. extrinsic ILC effects partially resolved"]},{"year":2021,"claim":"Provided the structural basis for SH2 phosphotyrosine recognition and motif specificity, and defined a NETosis/oxidized-phospholipid mechanism by which hematopoietic LNK deficiency drives atherothrombosis.","evidence":"X-ray crystallography of LNK-SH2 bound to phospho-JAK2 and phospho-EPOR with mutagenesis; Lnk-/-PAD4-/- thrombosis models, E06-scFv rescue, and human iPSC LNK(TT) cells","pmids":["34671038","34846914"],"confidence":"High","gaps":["Structures limited to two motifs; binding to other receptors inferred","PH-domain contribution to membrane targeting not structurally resolved"]},{"year":2022,"claim":"Demonstrated with a precise CRISPR knock-in that the human R262W variant is a hypomorph enhancing IL-12/STAT4 signaling and IFN-γ production in CD8+ T cells, causally driving hypertension, and extended LNK's JAK2/SHP2-dependent suppression to solid tumors.","evidence":"Arg/Arg vs. Trp/Trp knock-in mice with angiotensin II infusion, Stat4 phospho-readout, and BP telemetry; SH2B3 Co-IP with JAK2/SHP2 and signaling assays in lung cancer cells","pmids":["36169218","35589677"],"confidence":"High","gaps":["Solid-tumor function rests on single-lab Co-IP and overexpression","Cell types beyond CD8+ T cells in the variant phenotype not fully dissected"]},{"year":2024,"claim":"Established a cell-type-specific eosinophil pathway, showing eosinophil-intrinsic LNK loss elevates JAK/STAT signaling and drives EETosis-dependent arterial thrombosis, validated in human iPSC-derived cells.","evidence":"Eosinophil-specific conditional Lnk knockout, eosinophil depletion, DNase I rescue, and human iPSC-derived LNK(TT) eosinophil assays","pmids":["38096361"],"confidence":"High","gaps":["Specific receptor driving eosinophil JAK/STAT hyperactivation not defined","Relative contribution of eosinophils vs. neutrophils/platelets to thrombosis not quantified"]},{"year":null,"claim":"How LNK's full domain architecture (PH-mediated membrane targeting, interdomain regions, and SH2) is integrated into a single regulated signaling complex on intact receptors, and the structural basis for binding receptors beyond JAK2/EPOR, remains incompletely defined.","evidence":"","pmids":[],"confidence":"High","gaps":["No full-length LNK structure","PH domain ligand/membrane interaction unresolved","Stoichiometry and dynamics of LNK assembly on activated receptors unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[13,14,24,29]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[7,8,13,34]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4,21]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,11,23]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,23]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[21]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,13,34]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,28,32,37]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[18,25,35,37]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[16,30,35]}],"complexes":[],"partners":["JAK2","EPOR","KIT","MPL","FLT3","JAK3","PTPN11","PDGFRA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UQQ2","full_name":"SH2B adapter protein 3","aliases":["Lymphocyte adapter protein","Lymphocyte-specific adapter protein Lnk","Signal transduction protein Lnk"],"length_aa":575,"mass_kda":63.2,"function":"Links T-cell receptor activation signal to phospholipase C-gamma-1, GRB2 and phosphatidylinositol 3-kinase","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q9UQQ2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SH2B3","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/SH2B3","total_profiled":1310},"omim":[{"mim_id":"617573","title":"C-TYPE LECTIN DOMAIN FAMILY 12, MEMBER B; CLEC12B","url":"https://www.omim.org/entry/617573"},{"mim_id":"613065","title":"LEUKEMIA, ACUTE LYMPHOBLASTIC; ALL","url":"https://www.omim.org/entry/613065"},{"mim_id":"612520","title":"TYPE 1 DIABETES MELLITUS 20; T1D20","url":"https://www.omim.org/entry/612520"},{"mim_id":"612011","title":"CELIAC DISEASE, SUSCEPTIBILITY TO, 13; CELIAC13","url":"https://www.omim.org/entry/612011"},{"mim_id":"612008","title":"CELIAC DISEASE, SUSCEPTIBILITY TO, 10; CELIAC10","url":"https://www.omim.org/entry/612008"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":57.3}],"url":"https://www.proteinatlas.org/search/SH2B3"},"hgnc":{"alias_symbol":["LNK","IDDM20"],"prev_symbol":[]},"alphafold":{"accession":"Q9UQQ2","domains":[{"cath_id":"2.30.29.30","chopping":"198-307","consensus_level":"high","plddt":85.4843,"start":198,"end":307},{"cath_id":"3.30.505.10","chopping":"352-462","consensus_level":"high","plddt":85.9321,"start":352,"end":462}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UQQ2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UQQ2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UQQ2-F1-predicted_aligned_error_v6.png","plddt_mean":62.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SH2B3","jax_strain_url":"https://www.jax.org/strain/search?query=SH2B3"},"sequence":{"accession":"Q9UQQ2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UQQ2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UQQ2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UQQ2"}},"corpus_meta":[{"pmid":"20404132","id":"PMC_20404132","title":"Novel mutations in the inhibitory adaptor protein LNK drive JAK-STAT signaling in patients with myeloproliferative neoplasms.","date":"2010","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/20404132","citation_count":288,"is_preprint":false},{"pmid":"12070287","id":"PMC_12070287","title":"Cytokine signaling and hematopoietic homeostasis are disrupted in Lnk-deficient mice.","date":"2002","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/12070287","citation_count":199,"is_preprint":false},{"pmid":"15705783","id":"PMC_15705783","title":"Lnk inhibits erythropoiesis and Epo-dependent JAK2 activation and downstream signaling pathways.","date":"2005","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/15705783","citation_count":191,"is_preprint":false},{"pmid":"18618018","id":"PMC_18618018","title":"Lnk controls mouse hematopoietic stem cell self-renewal and quiescence through direct interactions with JAK2.","date":"2008","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/18618018","citation_count":172,"is_preprint":false},{"pmid":"20724988","id":"PMC_20724988","title":"LNK mutation studies in blast-phase myeloproliferative neoplasms, and in chronic-phase disease with TET2, IDH, JAK2 or MPL mutations.","date":"2010","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/20724988","citation_count":166,"is_preprint":false},{"pmid":"15337790","id":"PMC_15337790","title":"Lnk inhibits Tpo-mpl signaling and Tpo-mediated megakaryocytopoiesis.","date":"2004","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/15337790","citation_count":160,"is_preprint":false},{"pmid":"8524815","id":"PMC_8524815","title":"Cloning and characterization of Lnk, a signal transduction protein that links T-cell receptor activation signal to phospholipase C gamma 1, Grb2, and phosphatidylinositol 3-kinase.","date":"1995","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/8524815","citation_count":148,"is_preprint":false},{"pmid":"20560212","id":"PMC_20560212","title":"Evolutionary and functional analysis of celiac risk loci reveals SH2B3 as a protective factor against bacterial infection.","date":"2010","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20560212","citation_count":144,"is_preprint":false},{"pmid":"25664851","id":"PMC_25664851","title":"Lymphocyte adaptor protein LNK deficiency exacerbates hypertension and end-organ inflammation.","date":"2015","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/25664851","citation_count":136,"is_preprint":false},{"pmid":"11805142","id":"PMC_11805142","title":"Enhanced hematopoiesis by hematopoietic progenitor cells lacking intracellular adaptor protein, Lnk.","date":"2002","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/11805142","citation_count":122,"is_preprint":false},{"pmid":"11114373","id":"PMC_11114373","title":"Control of B cell production by the adaptor protein lnk. 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it is tyrosine phosphorylated by p56lck, which then binds to phospho-LNK through its SH2 domain; LNK associates with tyrosine-phosphorylated TCR zeta-chain via its SH2 domain; overexpression of LNK in Jurkat cells inhibits anti-CD3-mediated NF-AT activation.\",\n      \"method\": \"Confocal fluorescence microscopy (GFP fusion), co-immunoprecipitation in COS cells, NF-AT luciferase reporter assay in Jurkat cells\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (localization, Co-IP, functional reporter), single lab\",\n      \"pmids\": [\"10799879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"LNK deficiency in mice causes expansion of B lineage cells and hypersensitivity of pro-B cell precursors to SCF (c-Kit ligand), establishing LNK as a negative regulator of B cell production downstream of c-Kit signaling.\",\n      \"method\": \"Lnk knockout mouse generation, bone marrow analysis, B cell precursor culture with SCF\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with defined cellular phenotype, replicated by multiple labs\",\n      \"pmids\": [\"11114373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Human LNK binds to the C-terminal segment (repeats 19-23C, residues 2006-2454) of actin-binding protein ABP-280 (filamin A) via a 56-amino acid interdomain region between its PH and SH2 domains; this interaction was confirmed by co-immunoprecipitation of endogenous proteins in Jurkat cells and co-localization at plasma membrane and juxtanuclear region.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, confocal immunofluorescence\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus reciprocal Co-IP with endogenous proteins, single lab\",\n      \"pmids\": [\"11163396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Lnk-deficient mice display expanded hematopoietic progenitors with hypersensitivity to multiple cytokines including IL-3, IL-7, and stem cell factor, and Lnk inactivation causes abnormal modulation of IL-3 and SCF-mediated signaling pathways; Lnk is highly expressed in multipotent cells and committed erythroid, megakaryocyte, and myeloid precursors.\",\n      \"method\": \"Lnk knockout mouse generation, in vitro proliferation assays, cytokine signaling (Western blot), expression profiling\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with multiple cytokine pathways tested, replicated by independent lab\",\n      \"pmids\": [\"12070287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Lnk is phosphorylated by and associates with c-Kit following SCF stimulation; Lnk deficiency enhances c-Kit-mediated signaling and selectively inhibits phosphorylation of Gab2 and activation of the MAPK cascade downstream of c-Kit.\",\n      \"method\": \"Co-immunoprecipitation, Western blot signaling analysis in Lnk-/- hematopoietic progenitors\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with knockout comparison, single lab, two orthogonal methods\",\n      \"pmids\": [\"11805142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Lnk overexpression negatively regulates Tpo-mediated megakaryocyte proliferation and endomitosis; Lnk deficiency causes enhanced STAT3, STAT5, Akt, and MAPK signaling in response to Tpo; the SH2 domain of Lnk is essential for its inhibitory function, whereas the conserved C-terminal tyrosine is dispensable and the PH domain contributes but is not essential.\",\n      \"method\": \"Lnk overexpression and knockout in hematopoietic cell lines and primary cells, Western blot signaling analysis, domain mutant analysis\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout plus domain mutagenesis, multiple signaling readouts, replicated observations\",\n      \"pmids\": [\"15337790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Lnk negatively modulates EpoR signaling by attenuating JAK2 activation; wild-type Lnk becomes tyrosine phosphorylated following Epo administration and inhibits EpoR phosphorylation; the Lnk SH2 domain is essential for inhibitory function, blocking STAT5, Akt, and MAPK pathways in primary erythroblasts; the conserved C-terminal tyrosine and PH domain are not critical for this inhibition.\",\n      \"method\": \"Lnk overexpression in 32D/EpoR cells and primary fetal liver erythroblasts, Western blot for JAK2/EpoR/STAT5/Akt/MAPK phosphorylation, SH2 domain mutant analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (overexpression, domain mutagenesis, primary cell signaling), mechanistic depth\",\n      \"pmids\": [\"15705783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Lnk regulates postnatal HSC expansion antagonistically to thrombopoietin; Lnk-/- HSCs display enhanced THPO responsiveness and their postnatal expansion is completely dependent on THPO, as Lnk-/-Thpo-/- double knockout mice have 65-fold fewer LT-HSCs than Lnk-/- mice.\",\n      \"method\": \"Genetic double knockout (Lnk-/-Thpo-/-), HSC quantification, competitive repopulation\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis via double knockout, clean phenotypic readout\",\n      \"pmids\": [\"16882979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In endothelial cells, Lnk down-regulates TNF-α-induced VCAM-1 and E-selectin expression by activating PI3K/Akt signaling and inhibiting ERK1/2 phosphorylation, without affecting NF-κB p65 phosphorylation/translocation or IκBα degradation; endothelial nitric oxide synthase and HO-1 are identified as downstream targets of Lnk-mediated PI3K/Akt activation.\",\n      \"method\": \"Lnk overexpression in endothelial cells, Western blot for VCAM-1/E-selectin/NF-κB/Akt/ERK/p38/JNK, PI3K inhibitor treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — overexpression with multiple pathway readouts and inhibitor validation, single lab\",\n      \"pmids\": [\"16644735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Lnk negatively regulates the activating MPL mutation MPLW515L; Lnk associates with activated wild-type MPL and MPLW515L at the plasma membrane; the Lnk SH2 domain is essential for binding and down-regulation; MPLW515L-expressing cells are more susceptible to Lnk inhibitory function than MPL wild-type cells; Lnk is tyrosine phosphorylated following TPO stimulation.\",\n      \"method\": \"Co-immunoprecipitation, confocal colocalization, overexpression/knockdown in Ba/F3-MPLW515L and UT7-MPLW515L cells, proliferation assays, Western blot\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus functional knockdown/overexpression, single lab\",\n      \"pmids\": [\"17693582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Lnk negatively regulates HSC self-renewal specifically through the TPO/Mpl pathway; Lnk-/- HSCs show enhanced TPO-mediated STAT5 activation (but not p38 inactivation in WT HSCs), and symmetrical self-renewal division is efficiently induced by TPO+SCF only in Lnk-deficient HSCs.\",\n      \"method\": \"Single-cell cultures, competitive repopulation, single-cell transplantation, single-cell immunostaining for p38/STAT5/Akt\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (single-cell assays, transplantation), mechanistic signal pathway mapping\",\n      \"pmids\": [\"17284614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Lnk directly binds to phosphorylated tyrosine residues in JAK2 following TPO stimulation; Lnk controls HSC quiescence and self-renewal predominantly through Mpl signaling; the JAK2 V617F mutant retains the ability to bind Lnk; an activated JAK2 mutant unable to bind Lnk causes greater myeloid expansion and accelerated myelofibrosis.\",\n      \"method\": \"Co-immunoprecipitation (biochemical binding), genetic epistasis (Lnk-/- × Mpl-/- mice), bone marrow transplantation, 5-FU treatment, cell cycle analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct biochemical binding plus genetic epistasis plus structure-function (binding-deficient mutant), multiple orthogonal methods\",\n      \"pmids\": [\"18618018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The Lnk SH2 domain binds directly and preferentially to phosphorylated tyrosine 567 in the c-Kit juxtamembrane domain; this binding is abolished by Y568F point mutation (rat c-Kit numbering Y567) and competed by phosphopeptides; Lnk down-regulates SCF-induced MAPK and JNK signaling but not PI3K signaling in mast cells, and inhibits SCF-dependent migration via Rac and p38 MAPK.\",\n      \"method\": \"GST pull-down with c-Kit domain constructs, co-immunoprecipitation with Y568F mutant, Lnk-/- bone marrow mast cells reconstituted with Lnk mutants, proliferation/migration assays, Western blot\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro binding (GST pull-down + mutagenesis) plus functional reconstitution in primary cells, two orthogonal methods\",\n      \"pmids\": [\"18753636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Lnk associates with c-Kit phospho-Tyr568 in the juxtamembrane domain; binding is abolished by the Y568F mutation and competed by phospho-Tyr568 peptides; Lnk binds directly to c-Kit without requiring other interacting partners, as shown by pull-down with GST-fusion proteins.\",\n      \"method\": \"GST pull-down with c-Kit domain constructs, co-immunoprecipitation with Y568F mutant c-Kit, peptide competition assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro direct binding reconstitution with mutagenesis and peptide competition, confirms prior finding independently\",\n      \"pmids\": [\"18588518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Lnk regulates integrin alphaIIbbeta3 outside-in signaling in platelets; Lnk-/- platelets show reduced spreading on fibrinogen, reduced clot retraction, reduced tyrosine phosphorylation of the beta3 integrin subunit, and reduced binding of Fyn to integrin alphaIIbbeta3, leading to impaired thrombus stabilization in vivo.\",\n      \"method\": \"In vivo thrombosis models (FeCl3 and laser injury with live imaging), platelet spreading assay, clot retraction assay, co-immunoprecipitation of Fyn with integrin alphaIIbbeta3, Western blot for beta3 phosphorylation\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (in vivo imaging, biochemical Co-IP, functional spreading/retraction assays), genetic normalization of platelet counts\",\n      \"pmids\": [\"20038804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Lnk inhibits JAK2V617F constitutive activity; Lnk, through its SH2 and PH domains, interacts with both wild-type JAK2 and JAK2V617F; Lnk is tyrosine phosphorylated by constitutively active JAK2V617F; Lnk-deficient murine bone marrow cells are significantly more sensitive to transformation by JAK2V617F in CFU assays.\",\n      \"method\": \"Co-immunoprecipitation, Ba/F3-EpoR proliferation assay, Lnk-/- bone marrow CFU assay with JAK2V617F, Western blot\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus primary cell functional assay, single lab\",\n      \"pmids\": [\"19293402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Lnk deficiency accelerates and exacerbates oncogenic JAK2-induced myeloproliferative disease; an activated form of JAK2 unable to bind Lnk causes greater myeloid expansion and accelerated myelofibrosis, demonstrating that Lnk directly inhibits oncogenic JAK2 in constraining MPD; Lnk deficiency also cooperates with BCR/ABL (which does not directly interact with Lnk) in CML-like disease development.\",\n      \"method\": \"Bone marrow transplantation with JAK2-activated mutants lacking Lnk binding, Lnk-/- mouse models, genetic double mutant analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — structure-function (binding-deficient JAK2 mutant) plus genetic epistasis in vivo, multiple disease models\",\n      \"pmids\": [\"20458146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Disease-associated LNK mutations (5bp deletion/missense causing truncation, and E208Q missense in PH domain) impair LNK function; BaF3-MPL cells transduced with these LNK mutants display augmented and sustained thrombopoietin-dependent growth and JAK-STAT signaling.\",\n      \"method\": \"Retroviral transduction of LNK mutants in BaF3-MPL cells, proliferation assays, JAK-STAT signaling by phosphoflow/Western blot, primary patient CD34+ progenitor analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reconstitution with patient-derived mutants in cell lines, single lab\",\n      \"pmids\": [\"20404132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Carriers of the SH2B3 rs3184504*A (R262W) risk allele show stronger activation of the NOD2 recognition pathway in response to lipopolysaccharide and muramyl dipeptide, suggesting LNK plays a role in innate immune signaling against bacteria.\",\n      \"method\": \"Ex vivo stimulation of peripheral blood cells from genotyped donors, cytokine/NOD2 pathway activation assays\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — functional assay in primary cells stratified by genotype, single study, indirect mechanism\",\n      \"pmids\": [\"20560212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LNK (SH2B3) is expressed in endothelial cells and localizes to focal adhesions (co-distributing with vinculin); LNK inhibition decreases cell spreading while sustained expression increases focal adhesion number; LNK regulates beta1-integrin-mediated Akt and GSK3β signaling; alpha-parvin is a molecular target of LNK responsible for impaired focal adhesion dynamics; ILK is identified as a new molecular partner for LNK, which regulates alpha-parvin expression through ILK interaction.\",\n      \"method\": \"RNA interference, immunofluorescence localization, co-immunoprecipitation identifying ILK and alpha-parvin as partners, cell spreading and migration assays, Western blot\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus RNAi functional assays plus localization, single lab, multiple methods\",\n      \"pmids\": [\"22441983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SH2B3 binds to and inhibits neurite outgrowth by binding to phosphorylated TrkA (NGF receptor) via its SH2 domain; SH2B3 represses NGF-induced PLCγ, MEK-ERK1/2, and PI3K-AKT pathway activation and Egr-1 expression; SH2B3 reduces the interaction between SH2B1β and TrkA, competing with positive-acting family members.\",\n      \"method\": \"Overexpression in PC12 cells and primary cortical neurons, Western blot for PLCγ/ERK/AKT/Egr-1, neurite outgrowth assays, co-immunoprecipitation of TrkA with SH2B3/SH2B1β\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple signaling pathway readouts with domain mutants (SH2 domain sufficient), Co-IP, single lab\",\n      \"pmids\": [\"22028877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"14-3-3 proteins bind to LNK at two serine phosphorylation sites (phosphorylated by GSK3 and PKA kinases); 14-3-3 binding interferes with the LNK-JAK2 interaction, alleviating LNK inhibition of JAK2 signaling; 14-3-3 binding sequesters LNK in the cytoplasm away from the plasma membrane-proximal JAK2; mutations of these serine residues abrogated 14-3-3 binding and augmented LNK's growth inhibitory function.\",\n      \"method\": \"Co-immunoprecipitation, kinase assays (GSK3/PKA), subcellular fractionation, mutagenesis of LNK serine sites, bone marrow transplantation, cell proliferation assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, kinase assay, localization, mutagenesis, in vivo transplant), single lab but mechanistically comprehensive\",\n      \"pmids\": [\"22546852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Lnk binds to FLT3 and FLT3-ITD through its SH2 domain; the phosphorylated tyrosines 572, 591, and 919 of FLT3 are involved in direct binding to Lnk; Lnk is phosphorylated by both FL-activated FLT3-WT and constitutively active FLT3-ITD; Lnk suppresses FLT3-WT/ITD-dependent signaling and cell proliferation.\",\n      \"method\": \"Co-immunoprecipitation, SH2 domain mutant analysis, shRNA depletion and overexpression in 32D cells, Lnk-/- primary bone marrow FL stimulation assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with site mapping plus functional knockdown/overexpression, single lab\",\n      \"pmids\": [\"22942183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss of SH2B3 increases JAK-STAT signaling, promotes lymphoid cell proliferation, and accelerates leukemia development in a mouse model of NOTCH1-induced ALL; combined loss of Lnk and Tp53 or Ink4a/Arf triggers transplantable precursor B-ALL with gene expression profiles similar to human Ph-like B-ALL.\",\n      \"method\": \"Genetic mouse models (Lnk-/- combined with tumor suppressor knockouts), bone marrow transplantation, gene expression profiling, JAK-STAT signaling Western blot\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in multiple mouse models with transplantation and molecular readouts\",\n      \"pmids\": [\"23908464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SH2B3 (LNK) PH domain missense mutations from MPN patients show mild loss of function against wild-type JAK2 and JAK2V617F but retain binding capacity for JAK2, 14-3-3, and CBL adaptors; no dominant-negative effect was observed.\",\n      \"method\": \"Co-immunoprecipitation of JAK2/14-3-3/CBL with PH domain mutants, signaling assays in transfected cells\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding partners tested with domain mutants, single lab\",\n      \"pmids\": [\"23590807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Lnk suppresses IL-11 signaling in HSPCs by inhibiting tyrosine phosphorylation of SHP-2/PTPN11 and its association with Grb2, and attenuating Erk MAP kinase activation; SHP-2 contains a binding motif for the Lnk SH2 domain that is phosphorylated in response to IL-11 stimulation.\",\n      \"method\": \"Co-immunoprecipitation of SHP-2/Grb2 with Lnk, Western blot for Erk activation, Lnk-/- HSPC radiation resistance assays, IL-11 stimulation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with mechanistic pathway mapping in primary cells, single lab\",\n      \"pmids\": [\"24297922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss of LNK in hematopoietic cells (established by bone marrow transplantation) is primarily responsible for angiotensin II-induced renal and vascular inflammation and predisposition to hypertension; Ang II infusion increases IFN-γ-producing CD8+ T cells in Lnk-/- mice, and IFN-γ deficiency blunts the hypertensive response.\",\n      \"method\": \"Bone marrow transplantation, angiotensin II infusion model, IFN-γ KO epistasis, flow cytometry for CD8+ T cells, renal/vascular histology\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bone marrow transplantation establishing hematopoietic cell causality plus IFN-γ genetic epistasis, two orthogonal approaches\",\n      \"pmids\": [\"25664851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LNK regulates pro-B progenitor homeostasis by attenuating IL-7-stimulated JAK/STAT5 signaling via a direct interaction with phosphorylated JAK3; combined Lnk and Tp53 deficiency triggers B-ALL sensitive to JAK inhibitors.\",\n      \"method\": \"Co-immunoprecipitation of LNK with phospho-JAK3, JAK inhibitor treatment of Lnk-/-Tp53-/- leukemia transplants, IL-7 hypersensitivity assays, gene expression profiling\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishing direct JAK3 binding plus functional inhibitor studies, single lab\",\n      \"pmids\": [\"26974155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LNK R262W (TT genotype) is a loss-of-function variant associated with expanded hematopoietic stem cells and enhanced megakaryopoiesis via increased MPL signaling in human cord blood; in Lnk-deficient mice, platelet LNK deficiency increases MPL signaling and AKT activation; hypercholesterolemia acts synergistically with LNK deficiency via SHIP-1 dephosphorylation to further increase AKT and platelet activation.\",\n      \"method\": \"Human cord blood HSC expansion assays, mouse bone marrow transplantation atherosclerosis/thrombosis models, Western blot for Akt/SHIP-1 phosphorylation, platelet activation assays\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional endpoints in human cord blood and mouse models, single lab\",\n      \"pmids\": [\"27430239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Lnk deficiency stabilizes stalled replication forks (in a manner partially dependent on alleviating blocks to cytokine-mediated JAK2 signaling) in Fancd2-/- HSCs, reducing replication stress and genomic instability, without impacting ICL repair; this restores HSC function in Fanconi anemia.\",\n      \"method\": \"Genetic double knockout (Lnk-/-Fancd2-/-), DNA fiber assays for fork stability, JAK2 signaling Western blot, HSC reconstitution transplantation, ICL repair assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (DNA fiber, genetic epistasis, transplantation), novel mechanistic link between JAK2 signaling and replication fork stability\",\n      \"pmids\": [\"30254368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Lnk/Sh2b3 controls adipose tissue homeostasis by negatively regulating IL-15-dependent group 1 innate lymphoid cells (G1-ILCs); Lnk-/- mice have impaired glucose tolerance and accumulation of G1-ILCs in adipose tissue; crossing with Il15-/- mice or depleting G1-ILCs (but not CD8+ T cells) ameliorates glucose intolerance; JAK inhibition improves glucose tolerance in Lnk-/- mice.\",\n      \"method\": \"Lnk-/- × Il15-/- double knockout, cell depletion (anti-NK1.1), JAK inhibitor treatment, flow cytometry, glucose tolerance tests\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (double KO) plus cell depletion plus pharmacological inhibition, multiple orthogonal approaches\",\n      \"pmids\": [\"30110639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LNK suppresses interferon-STAT1 signaling in melanoma; forced LNK expression inhibits IFN-induced STAT1 signaling, cell cycle arrest, and apoptosis; melanoma cells exposed to IFN upregulate LNK expression as a negative feedback mechanism; silencing LNK potentiates IFN-mediated cell killing.\",\n      \"method\": \"LNK overexpression and shRNA/CRISPR-Cas9 knockdown in melanoma cells, Western blot for STAT1 signaling, cell cycle and apoptosis assays, IFN stimulation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with mechanistic pathway readouts, single lab\",\n      \"pmids\": [\"31110180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal structures of the LNK SH2 domain bound to phosphorylated motifs from JAK2 and EPOR reveal a canonical SH2 fold with an additional N-terminal helix; specificity is conferred by amino acids one and three residues downstream of the phosphotyrosine; disease-associated LNK mutations show impaired target binding in vitro and reduced ability to inhibit signaling.\",\n      \"method\": \"X-ray crystallography (two structures: LNK-SH2/phospho-JAK2 and LNK-SH2/phospho-EPOR), biochemical binding assays, mutagenesis functional signaling assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures with biochemical binding characterization and mutagenesis functional validation, rigorous multi-method study\",\n      \"pmids\": [\"34671038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Hematopoietic Lnk deficiency promotes arterial thrombosis via a NETosis mechanism dependent on oxidized phospholipids (OxPL); Lnk-deficient platelets release more OxPL upon thrombin activation and Lnk-deficient neutrophils show increased priming and response to OxPL; PAD4 deficiency completely reversed accelerated thrombosis, and E06-scFv targeting OxPL reversed NETosis, atherosclerosis, and thrombosis.\",\n      \"method\": \"Lnk-/-PAD4-/- double knockout, E06-scFv transgene, carotid artery thrombosis model, OxPL measurement from platelets, NETosis assays, human iPSC-derived LNK(TT) cells\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (double KO) plus transgenic rescue plus human iPSC validation, multiple orthogonal approaches\",\n      \"pmids\": [\"34846914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SH2B3 binds to JAK2 and SHP2 to suppress JAK2/STAT3 and SHP2/Grb2/PI3K/AKT signaling pathways in lung cancer cells, inhibiting anoikis resistance, proliferation, migration, invasion, and EMT; TGF-β1 promotes these processes by reducing SH2B3 expression.\",\n      \"method\": \"Co-immunoprecipitation of SH2B3 with JAK2 and SHP2, SH2B3 overexpression in lung cancer lines, Western blot for JAK2/STAT3/Grb2/PI3K/AKT phosphorylation, in vivo xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for two binding partners plus functional overexpression with signaling readouts, single lab\",\n      \"pmids\": [\"35589677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The SH2B3 R262W (Trp/Trp) variant exhibits less negative regulation of IL-12 signaling, resulting in enhanced IL-12-induced Stat4 phosphorylation and IFN-γ production in CD8+ T cells, leading to exacerbated hypertension and renal injury following angiotensin II infusion.\",\n      \"method\": \"CRISPR-Cas9 knock-in mice (Arg/Arg vs. Trp/Trp), angiotensin II infusion model, Stat4 phosphorylation Western blot, IFN-γ ELISA from ex vivo stimulated T cells, blood pressure telemetry\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR knock-in of precise human variant with mechanistic signaling readout plus in vivo phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"36169218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Eosinophil-specific Lnk deficiency (LnkΔeos mice) causes isolated eosinophilia with increased eosinophil activation and JAK/STAT signaling, accelerating arterial thrombosis through eosinophil extracellular trap (EETosis) formation; DNase I infusion abolishing EETs and NETs reversed the accelerated thrombosis; human iPSC-derived LNK(TT) eosinophils showed increased activation and EETosis.\",\n      \"method\": \"Conditional eosinophil-specific Lnk knockout (eoCre×Lnkf/f), carotid artery thrombosis model, anti-Siglec-F eosinophil depletion, DNase I treatment, human iPSC-derived eosinophil assays, flow cytometry for JAK/STAT signaling\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO plus depletion plus pharmacological rescue plus human iPSC validation, multiple orthogonal approaches\",\n      \"pmids\": [\"38096361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Lnk binds to PDGFR-α, PDGFR-β, and the leukemogenic FIP1L1-PDGFRA fusion protein after PDGF exposure; deletion/mutation of the Lnk SH2 domain completely abolishes binding to FIP1L1-PDGFRA (but only partly prevents PDGFRA/B binding); Lnk inhibits PDGF-dependent proliferation and Erk phosphorylation, and suppresses growth of FIP1L1-PDGFRA- and TEL-PDGFRB-transformed 32D cells.\",\n      \"method\": \"Co-immunoprecipitation in 293T cells with SH2 mutants, Ba/F3 and 32D cell proliferation assays, Western blot for pErk\",\n      \"journal\": \"Experimental hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mutants plus functional proliferation assays, single lab\",\n      \"pmids\": [\"21310211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Lnk inhibits c-Fms (M-CSFR) signaling; Lnk binds to c-Fms; Lnk deficiency increases M-CSF-induced Akt phosphorylation (augmented and prolonged) while diminishing Erk phosphorylation, enhances ROS production, and inhibits M-CSF-induced macrophage migration.\",\n      \"method\": \"Co-immunoprecipitation of Lnk with c-Fms, Western blot for Akt/Erk in Lnk-/- vs. WT macrophages, clonogenic (M-CFU) assay, ROS production assay, migration assay\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus multiple functional readouts in primary knockout cells, single lab\",\n      \"pmids\": [\"20571037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LNK is expressed in neural stem and progenitor cells (NSPCs) in adult mouse and human SVZ; Lnk deficiency increases NSPC proliferation after stroke but not in intact brain; Lnk expression after stroke is upregulated through STAT1/3 transcription factors; LNK attenuates IGF-1 signaling by inhibiting AKT phosphorylation, reducing NSPC proliferation.\",\n      \"method\": \"Lnk-/- mouse stroke model, BrdU/EdU incorporation for proliferation, LNK overexpression in NSPC cultures, Western blot for AKT phosphorylation, STAT1/3 ChIP/reporter analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO plus overexpression plus mechanistic signaling readout (AKT), single lab\",\n      \"pmids\": [\"22496561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TPO-stimulated Lnk-deficient HSCs show enhanced Bcl-xL expression compared to normal HSCs; Bcl-xL downregulation by shRNA in Lnk-deficient HSCs reduces their reconstitution capacity; Lnk constrains Bcl-xL expression and thereby controls HSC apoptosis and survival downstream of TPO signaling.\",\n      \"method\": \"Western blot for Bcl-xL in Lnk-/- vs. WT HSCs, shRNA knockdown of Bcl-xL in Lnk-/- HSCs, competitive reconstitution transplantation, irradiation survival assay\",\n      \"journal\": \"Experimental hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — shRNA functional epistasis plus transplantation readout, single lab\",\n      \"pmids\": [\"22101255\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SH2B3 (LNK) is an intracellular adaptor protein that functions as a broad negative regulator of JAK-STAT and receptor tyrosine kinase signaling in hematopoietic, endothelial, immune, and other cell types: its SH2 domain binds directly to phosphorylated tyrosine residues on activated JAK2 (pY residues), JAK3, EPOR, c-Kit (pY568), c-Mpl, FLT3 (pY572/591/919), c-Fms, PDGFR, and TrkA, attenuating downstream STAT, PI3K/AKT, MAPK/ERK, and Rac/p38 signaling; 14-3-3 proteins phosphorylated at LNK serine sites (by GSK3/PKA) compete with JAK2 for LNK binding and sequester LNK away from the membrane, providing a positive feedback release of LNK inhibition; crystal structures reveal the LNK SH2 domain adopts a canonical fold with an N-terminal helix, and specificity is conferred by residues +1 and +3 relative to phosphotyrosine; the PH domain contributes to membrane targeting and some interactions; disease-associated mutations in the PH and SH2 domains impair target binding and signaling inhibition, leading to myeloproliferative neoplasms, ALL, and autoimmunity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SH2B3 (LNK) is an intracellular adaptor protein that acts as a broad negative regulator of cytokine receptor and receptor tyrosine kinase signaling across hematopoietic, endothelial, immune, vascular, and neural cell types, dampening proliferative and inflammatory outputs downstream of these receptors [#5, #8, #25]. Its SH2 domain is the essential effector module: it binds directly to specific phosphotyrosine motifs on activated JAK2 and EPOR [#13, #34], JAK3 [#29], c-Kit pTyr568 [#14, #15], MPL [#11], FLT3/FLT3-ITD at pTyr572/591/919 [#24], PDGFRs and the FIP1L1-PDGFRA fusion [#39], and the phosphatase SHP2 [#27], thereby attenuating downstream STAT5/STAT3, PI3K/AKT, and MAPK/ERK signaling [#7, #8]. Crystal structures of the LNK SH2 domain bound to phospho-JAK2 and phospho-EPOR motifs reveal a canonical SH2 fold with an additional N-terminal helix, with binding specificity conferred by the residues at the +1 and +3 positions relative to the phosphotyrosine [#34]. LNK function is itself tuned by phosphorylation: GSK3- and PKA-phosphorylated serine sites recruit 14-3-3 proteins that compete with JAK2 and sequester LNK in the cytoplasm, relieving its inhibition of signaling [#23]. Through these activities LNK restrains hematopoietic stem cell self-renewal and progenitor expansion in a thrombopoietin/MPL-dependent manner [#9, #12, #13] and constrains B-lineage and myeloid output [#3, #5]. Loss or mutation of LNK augments JAK-STAT signaling and drives disease: it accelerates oncogenic JAK2-induced myeloproliferative neoplasms and cooperates with tumor suppressor loss to produce B-ALL [#18, #25, #29], and patient-derived PH- and SH2-domain mutations impair target binding and signaling inhibition [#19, #34]. The R262W (rs3184504) risk variant is a loss-of-function allele that enhances cytokine-driven T-cell responses and predisposes to hypertension and renal injury [#37], and hematopoietic LNK deficiency promotes vascular inflammation, atherosclerosis, and arterial thrombosis through NETosis/EETosis mechanisms [#28, #35, #38].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established LNK as a tyrosine-phosphorylated adaptor coupling receptor activation to downstream signaling enzymes, the first hint of its scaffolding role.\",\n      \"evidence\": \"Co-immunoprecipitation of LNK with PLC-γ1, PI3K, and Grb2 in activated T lymphocytes\",\n      \"pmids\": [\"8524815\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect nature of associations not resolved\", \"No receptor target identified\", \"Functional consequence of associations untested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Redirected attention from antigen receptors to other receptor systems by showing LNK is not rate-limiting in TCR signaling despite TCR-induced phosphorylation.\",\n      \"evidence\": \"Transgenic thymocyte overexpression with T cell activation assays in mice\",\n      \"pmids\": [\"9169414\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the relevant non-antigen receptors\", \"Loss-of-function not yet tested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Genetic knockout defined LNK's core physiological function as a negative regulator of hematopoietic cell production downstream of c-Kit, moving beyond correlative biochemistry.\",\n      \"evidence\": \"Lnk knockout mice with B-cell precursor expansion and SCF hypersensitivity; parallel TCR ζ-chain/p56lck association and NF-AT reporter studies\",\n      \"pmids\": [\"11114373\", \"10799879\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct receptor-binding mechanism not yet shown\", \"Domain requirements undefined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Broadened LNK's negative regulatory scope across multiple cytokines and mapped its action to specific receptors and effectors, defining it as a multi-pathway brake on progenitor signaling.\",\n      \"evidence\": \"Lnk knockout progenitor cytokine hypersensitivity (IL-3, IL-7, SCF) and c-Kit association with selective Gab2/MAPK suppression\",\n      \"pmids\": [\"12070287\", \"11805142\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphotyrosine binding sites not yet mapped\", \"SH2 domain requirement not yet isolated\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Isolated the SH2 domain as the essential inhibitory module and the C-terminal tyrosine/PH domain as dispensable, defining the structural logic of LNK inhibition of TPO/MPL signaling.\",\n      \"evidence\": \"Domain-mutant overexpression and knockout signaling analysis (STAT3/5, Akt, MAPK) in megakaryocytic cells\",\n      \"pmids\": [\"15337790\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphotyrosine target of the SH2 domain not yet identified\", \"PH domain contribution not fully resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Pinpointed JAK2 as the proximal target in EPOR signaling, showing LNK attenuates JAK2 activation through its SH2 domain.\",\n      \"evidence\": \"SH2-mutant analysis in EpoR cells and primary erythroblasts with JAK2/EpoR/STAT5/Akt/MAPK phospho-readouts\",\n      \"pmids\": [\"15705783\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct LNK–JAK2 binding not yet demonstrated biochemically\", \"Phosphotyrosine motif unmapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Genetic epistasis established that LNK's control of HSC expansion operates specifically through the thrombopoietin axis, linking the molecular brake to a stem-cell-level phenotype.\",\n      \"evidence\": \"Lnk-/-Thpo-/- double knockout HSC quantification and competitive repopulation; endothelial TNF-α/VCAM-1 studies\",\n      \"pmids\": [\"16882979\", \"16644735\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LNK acts directly on MPL or on JAK2 not yet distinguished\", \"Endothelial mechanism distinct from hematopoietic\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapped LNK action to MPL/STAT5 in HSC self-renewal and showed it directly engages activated MPL including the oncogenic W515L mutant, foreshadowing its tumor-suppressive role.\",\n      \"evidence\": \"Single-cell HSC assays, transplantation, and Co-IP/colocalization of LNK with MPL and MPLW515L\",\n      \"pmids\": [\"17284614\", \"17693582\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Oncogenic mutants more susceptible to LNK — mechanism unexplained\", \"Direct phosphotyrosine site on MPL/JAK2 not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated direct SH2-mediated binding of LNK to specific phosphotyrosines — JAK2 pY residues and c-Kit pTyr568 — establishing the molecular interaction underlying its inhibition, and showed an oncogenic JAK2 mutant uncoupled from LNK drives worse disease.\",\n      \"evidence\": \"Co-IP and genetic epistasis for JAK2 (Lnk-/-×Mpl-/-, binding-deficient JAK2 mutant); GST pull-downs with Y568F mutagenesis and peptide competition for c-Kit; platelet integrin/Fyn studies\",\n      \"pmids\": [\"18618018\", \"18753636\", \"18588518\", \"20038804\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of phosphotyrosine recognition not yet resolved\", \"Generality of motif across receptors untested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established LNK as a genuine tumor suppressor restraining oncogenic JAK2 and revealed patient-derived PH/SH2 mutations as loss-of-function lesions, while extending LNK binding to additional RTKs.\",\n      \"evidence\": \"Bone marrow transplantation with Lnk-uncoupled JAK2 mutants, patient mutant reconstitution in BaF3-MPL cells, c-Fms Co-IP, R262W genotype-stratified NOD2 assays\",\n      \"pmids\": [\"20458146\", \"20404132\", \"20571037\", \"20560212\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative binding effects of mutations not measured\", \"R262W mechanism remained correlative at this stage\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended LNK's negative regulatory reach to PDGFRs, TrkA, focal adhesion machinery, and neural progenitors, defining it as a broadly acting adaptor across cell lineages.\",\n      \"evidence\": \"SH2-mutant Co-IP for PDGFR/FIP1L1-PDGFRA, TrkA Co-IP and neurite assays, focal-adhesion Co-IP (ILK, alpha-parvin), NSPC stroke model with IGF-1/AKT readout\",\n      \"pmids\": [\"21310211\", \"22028877\", \"22441983\", \"22496561\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Several interactions rest on single-lab Co-IP\", \"Direct vs. indirect binding to focal adhesion partners unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified the regulatory switch controlling LNK itself: 14-3-3 binding at GSK3/PKA-phosphorylated serines competes with JAK2 and sequesters LNK from the membrane, providing feedback release of inhibition.\",\n      \"evidence\": \"Co-IP, GSK3/PKA kinase assays, subcellular fractionation, serine-site mutagenesis, and bone marrow transplantation\",\n      \"pmids\": [\"22546852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological stimuli driving GSK3/PKA phosphorylation of LNK undefined\", \"Quantitative competition kinetics not measured\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Cemented LNK as a leukemia suppressor whose loss synergizes with NOTCH1 and tumor-suppressor lesions to drive ALL, and mapped SHP2/PTPN11 as an SH2 target in IL-11 signaling.\",\n      \"evidence\": \"Lnk-/- combined tumor-suppressor mouse models with transplantation and expression profiling; SHP-2/Grb2 Co-IP in HSPCs; PH-mutant binding panels\",\n      \"pmids\": [\"23908464\", \"24297922\", \"23590807\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mild PH-mutant phenotypes left their disease contribution uncertain\", \"SHP2 binding motif not crystallographically resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined JAK3/IL-7 as an additional direct SH2 target in B-lineage homeostasis and showed LNK-deficient leukemias are JAK-inhibitor sensitive, linking mechanism to therapy, while clarifying the R262W variant as a quantitative loss-of-function allele driving thrombosis-relevant MPL signaling.\",\n      \"evidence\": \"Phospho-JAK3 Co-IP and JAK inhibitor treatment of Lnk-/-Tp53-/- leukemias; human cord blood HSC and mouse platelet/SHIP-1 studies of R262W\",\n      \"pmids\": [\"26974155\", \"27430239\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct JAK3 binding rests on single Co-IP\", \"Synergy with hypercholesterolemia mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed non-canonical and tissue-specific roles: LNK loss stabilizes stalled replication forks via JAK2 signaling in Fanconi anemia HSCs and controls adipose immune homeostasis and glucose tolerance through IL-15-dependent innate lymphoid cells.\",\n      \"evidence\": \"Lnk-/-Fancd2-/- DNA fiber assays and transplantation; Lnk-/-×Il15-/- double knockout, ILC depletion, and JAK inhibitor glucose tolerance tests\",\n      \"pmids\": [\"30254368\", \"30110639\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic link between JAK2 signaling and fork stability incompletely defined\", \"Cell-intrinsic vs. extrinsic ILC effects partially resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided the structural basis for SH2 phosphotyrosine recognition and motif specificity, and defined a NETosis/oxidized-phospholipid mechanism by which hematopoietic LNK deficiency drives atherothrombosis.\",\n      \"evidence\": \"X-ray crystallography of LNK-SH2 bound to phospho-JAK2 and phospho-EPOR with mutagenesis; Lnk-/-PAD4-/- thrombosis models, E06-scFv rescue, and human iPSC LNK(TT) cells\",\n      \"pmids\": [\"34671038\", \"34846914\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures limited to two motifs; binding to other receptors inferred\", \"PH-domain contribution to membrane targeting not structurally resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated with a precise CRISPR knock-in that the human R262W variant is a hypomorph enhancing IL-12/STAT4 signaling and IFN-γ production in CD8+ T cells, causally driving hypertension, and extended LNK's JAK2/SHP2-dependent suppression to solid tumors.\",\n      \"evidence\": \"Arg/Arg vs. Trp/Trp knock-in mice with angiotensin II infusion, Stat4 phospho-readout, and BP telemetry; SH2B3 Co-IP with JAK2/SHP2 and signaling assays in lung cancer cells\",\n      \"pmids\": [\"36169218\", \"35589677\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Solid-tumor function rests on single-lab Co-IP and overexpression\", \"Cell types beyond CD8+ T cells in the variant phenotype not fully dissected\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established a cell-type-specific eosinophil pathway, showing eosinophil-intrinsic LNK loss elevates JAK/STAT signaling and drives EETosis-dependent arterial thrombosis, validated in human iPSC-derived cells.\",\n      \"evidence\": \"Eosinophil-specific conditional Lnk knockout, eosinophil depletion, DNase I rescue, and human iPSC-derived LNK(TT) eosinophil assays\",\n      \"pmids\": [\"38096361\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific receptor driving eosinophil JAK/STAT hyperactivation not defined\", \"Relative contribution of eosinophils vs. neutrophils/platelets to thrombosis not quantified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LNK's full domain architecture (PH-mediated membrane targeting, interdomain regions, and SH2) is integrated into a single regulated signaling complex on intact receptors, and the structural basis for binding receptors beyond JAK2/EPOR, remains incompletely defined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length LNK structure\", \"PH domain ligand/membrane interaction unresolved\", \"Stoichiometry and dynamics of LNK assembly on activated receptors unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [13, 14, 24, 29]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 8, 13, 34]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 11, 23]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 23]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 13, 34]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 28, 32, 37]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [18, 25, 35, 37]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [16, 30, 35]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"JAK2\", \"EPOR\", \"KIT\", \"MPL\", \"FLT3\", \"JAK3\", \"PTPN11\", \"PDGFRA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}