{"gene":"PTPN2","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":2003,"finding":"TCPTP (PTPN2) directly dephosphorylates the insulin receptor (IR) beta-subunit. Both TC48 and TC45 isoforms form stable complexes with the tyrosine-phosphorylated IR beta-subunit (shown by substrate-trapping mutant D182A), and TCPTP-/- MEFs exhibit enhanced insulin-induced IR phosphorylation and PKB/Akt activation that is rescued by physiological re-expression of either isoform.","method":"Substrate-trapping mutant (D182A) co-immunoprecipitation, TCPTP-/- MEF rescue experiments, phosphorylation-specific Western blot","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — substrate-trapping plus genetic KO rescue, replicated in follow-up studies","pmids":["12612081"],"is_preprint":false},{"year":2004,"finding":"Insulin stimulation induces rapid, transient oxidation and inhibition of TC45 (the 45-kDa TCPTP isoform) via reactive oxygen species, establishing reversible oxidation as a physiological mechanism to transiently relieve TC45-mediated suppression of insulin receptor signaling.","method":"In-gel PTP activity assay, RNAi knockdown, substrate-trapping mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro PTP assay combined with RNAi and substrate-trapping, multiple orthogonal methods","pmids":["15192089"],"is_preprint":false},{"year":2004,"finding":"The cytoplasmic tail of integrin alpha-1 directly interacts with TCPTP and activates its phosphatase activity upon cell adhesion to collagen, resulting in reduced EGFR phosphorylation after EGF stimulation.","method":"Co-immunoprecipitation of alpha-1 integrin tail with TCPTP, cell-permeable peptide competition assay, phosphatase activity assay","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding and activation demonstrated biochemically with functional readout; replicated in subsequent structural studies","pmids":["15592458"],"is_preprint":false},{"year":2005,"finding":"PTP1B and TCPTP act coordinately but non-redundantly to regulate IR phosphorylation: PTP1B controls IR Y1162/Y1163 and Y972 phosphorylation and ERK1/2 signaling, whereas TCPTP controls Y972 phosphorylation and sustains Y1162/Y1163 dephosphorylation, with both contributing to PI3K/Akt signaling.","method":"PTP1B-/- and TCPTP-/- MEFs, RNAi suppression of TCPTP in PTP1B-/- background, phosphorylation-site-specific antibodies","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO plus RNAi with site-specific phospho-antibody readout, independent labs","pmids":["15632081"],"is_preprint":false},{"year":1999,"finding":"TC45 exits the nucleus upon EGF receptor activation, dephosphorylates the EGFR, inhibits EGF-dependent PI3K/PKB-Akt and JNK (but not ERK2) activation, and suppresses integrin-mediated Akt activation by acting upstream of PI3K to prevent p85 recruitment.","method":"TC45 and TC45-D182A substrate-trapping overexpression, pharmacological PI3K/EGFR inhibitors, signaling readouts","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — substrate-trapping mutant with multiple orthogonal pathway readouts","pmids":["10488121"],"is_preprint":false},{"year":2001,"finding":"TC45 dephosphorylates Delta-EGFR (a truncated, constitutively active EGFR mutant) in glioblastoma cells, inhibiting ERK2 and PI3K signaling and suppressing tumor growth in vivo.","method":"TC45-D182A substrate-trapping, signaling Western blots, anchorage-independent growth assay, intracranial xenograft mouse model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — substrate-trapping with in vitro and in vivo functional validation","pmids":["11514572"],"is_preprint":false},{"year":2001,"finding":"Hyperosmotic and other specific cellular stresses (those that activate AMP-activated protein kinase, AMPK) cause reversible cytoplasmic redistribution of TC45, which then dephosphorylates EGFR and attenuates JNK signaling; nuclear exit occurs by passive diffusion independent of CRM-1 exportin.","method":"GFP-TC45 live imaging, leptomycin B treatment, pharmacological AMPK activators, subcellular fractionation, signaling assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — direct localization experiments linked to functional consequence with pharmacological validation","pmids":["11479308"],"is_preprint":false},{"year":2006,"finding":"TCPTP is a negative regulator of CSF-1 receptor (CSF-1R) signaling and macrophage differentiation; the CSF-1R is identified as a physiological substrate of TCPTP via substrate-trapping, and TCPTP-/- macrophages show hyperphosphorylation of CSF-1R and enhanced Grb2/Gab2/Shp2 recruitment and ERK activation.","method":"Substrate-trapping experiments, TCPTP-/- mice, colony-forming unit assays, Western blot phosphorylation analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — substrate-trapping plus genetic KO with multiple downstream readouts","pmids":["16705167"],"is_preprint":false},{"year":2008,"finding":"TCPTP dephosphorylates VEGFR2 in a phosphosite-specific manner, inhibits its kinase activity and prevents its internalization; TCPTP activity is induced by integrin alpha-1-mediated adhesion to collagen, inhibiting VEGF-triggered endothelial cell proliferation, sprouting, and migration.","method":"TCPTP substrate-trapping mutant co-immunoprecipitation with VEGFR2, kinase activity assay, VEGFR2 internalization assay, endothelial cell functional assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — substrate-trapping, biochemical activity assay, and functional cellular assays","pmids":["18840653"],"is_preprint":false},{"year":2008,"finding":"TCPTP negatively regulates Src family kinase (SFK), JAK1, and STAT3 signaling in a cell-cycle-dependent manner; enhanced SFK and PI3K (but not JAK1/STAT3) signaling drives the accelerated G1/S transition in TCPTP-deficient cells.","method":"TCPTP-/- MEFs, RNAi in HeLa cells, pharmacological kinase inhibitors, cell cycle analysis","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO and RNAi with pharmacological dissection, single lab","pmids":["18948751"],"is_preprint":false},{"year":2009,"finding":"PTPN2 knockdown in pancreatic beta-cells amplifies IFN-gamma-induced STAT1 phosphorylation and exacerbates cytokine-induced apoptosis; double knockdown of both PTPN2 and STAT1 protects against cytokine death, placing PTPN2 upstream of STAT1 in IFN-gamma signaling in beta-cells.","method":"siRNA knockdown in rat beta-cells and human islets, STAT1 phosphorylation Western blot, cell death assays, epistasis by double KD","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 — RNAi epistasis with phosphorylation readout and functional apoptosis outcome in two cell types","pmids":["19336676"],"is_preprint":false},{"year":2011,"finding":"TCPTP negatively regulates CSF-1 receptor and oncogenic JAK1 (as well as NUP214-ABL1) in T-ALL; PTPN2 deletion sensitizes lymphoid cells to JAK1-mediated transformation and reduces sensitivity to JAK inhibition.","method":"PTPN2 deletion in T-ALL patient samples and functional assays, JAK1 kinase assays, JAK inhibitor sensitivity testing","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 — functional genetic analysis in patient-derived T-ALL cells with kinase substrate evidence","pmids":["21551237"],"is_preprint":false},{"year":2011,"finding":"Hypothalamic TCPTP is elevated in obesity and attenuates leptin signaling; neuronal-specific TCPTP deletion enhances leptin sensitivity and protects against diet-induced obesity; combined deletion of TCPTP and PTP1B in neurons has additive anti-obesity effects.","method":"Neuron-specific conditional KO mice, intracerebroventricular TCPTP inhibitor, leptin signaling (JAK2/STAT3 phosphorylation), metabolic phenotyping","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with pharmacological validation and additive epistasis, strong phenotypic readout","pmids":["22000926"],"is_preprint":false},{"year":2012,"finding":"TCPTP dephosphorylates SFK and regulates STAT3 signaling in breast cancer; TCPTP protein is lost in triple-negative breast cancers, and TCPTP deficiency in murine mammary fat pads or human breast cancer cell lines elevates SFK and STAT3 signaling; TCPTP reconstitution impairs cell proliferation and suppresses tumor growth in vivo.","method":"TCPTP-/- murine mammary fat pad, RNAi in human breast cancer lines, TCPTP reconstitution, xenograft mouse model","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO and reconstitution in vitro and in vivo with defined signaling readouts","pmids":["23166300"],"is_preprint":false},{"year":2012,"finding":"Phospho-Ser727 on STAT3 promotes TC45-mediated dephosphorylation of STAT3 pY705 to shorten the duration of STAT3 activity; TC45 knockdown causes prolonged pY705 in STAT3-WT but not STAT3-S727A, and TC45 overexpression causes rapid pY705 dephosphorylation only in STAT3-WT, demonstrating a phospho-Ser727-dependent substrate recognition mechanism.","method":"STAT3 mutants (S727A, S727D) in STAT3-knockdown HepG2 cells, TC45 KD and overexpression, phospho-specific Western blot","journal":"Genes to cells","confidence":"High","confidence_rationale":"Tier 2 — multiple STAT3 mutants combined with TC45 KD/OE, mechanistically rigorous","pmids":["22233524"],"is_preprint":false},{"year":2006,"finding":"TC48 isoform of TCPTP is localized to the ER via interaction with transmembrane protein p25; p25 coimmunoprecipitates with TC48 and its coexpression enhances ER localization, while a p25 mutant lacking the KKxx ER-retrieval signal causes TC48 Golgi trapping.","method":"Yeast two-hybrid screen, coimmunoprecipitation, colocalization microscopy, domain deletion mutants","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, Co-IP plus microscopy, no in vitro reconstitution","pmids":["16595549"],"is_preprint":false},{"year":2011,"finding":"TC48 directly dephosphorylates C3G (RapGEF1) at the Golgi; TC48 substrate-trapping mutant forms stable complex with phospho-C3G at the Golgi, and TC48 expression abrogates Src/IGF-induced C3G phosphorylation and inhibits neurite outgrowth in neuroblastoma cells.","method":"In vivo and in vitro binding assays, substrate-trapping mutant, co-localization microscopy, C3G phosphorylation assay, neurite outgrowth functional assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — substrate-trapping with co-localization and functional readout, single lab","pmids":["21876762"],"is_preprint":false},{"year":2001,"finding":"TC-PTP-/- MEFs exhibit delayed G1 progression with reduced cyclin D1 induction, sustained p27(KIP1), and decreased IKKβ activity and NF-κB activation following PDGF stimulation; re-introduction of wild-type TC-PTP rescues these defects, identifying TCPTP as a positive regulator of G1 progression via the NF-κB pathway.","method":"TC-PTP-/- MEFs, TC-PTP reconstitution, cell cycle analysis, NF-κB reporter assay, IKKβ kinase assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with rescue and multiple downstream readouts, single lab","pmids":["11498795"],"is_preprint":false},{"year":2014,"finding":"PTPN2 attenuates T-cell receptor (TCR)-dependent lymphopenia-induced proliferation (LIP) in CD8+ T cells; PTPN2-deficient CD8+ T cells undergo rapid LIP and acquire effector characteristics when transferred into lymphopenic hosts, leading to autoimmunity via elevated TCR signaling (but not IL-7-dependent responses).","method":"T-cell-specific PTPN2-deficient mice, adoptive transfer into lymphopenic hosts, TCR signaling readouts, flow cytometry","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with adoptive transfer and mechanistic dissection of TCR vs IL-7 pathways","pmids":["24445916"],"is_preprint":false},{"year":2015,"finding":"PTPN2 is induced by TCR activation in iTreg cells to restrain IL-2-mediated STAT5 phosphorylation, thereby promoting FOXP3 depletion; PTPN2 knockdown restores FOXP3 expression despite TCR signaling, placing PTPN2 as a negative regulator of STAT5 that limits FOXP3 stability in iTregs.","method":"PTPN2 KD in iTreg cells, STAT5 phosphorylation assay, FOXP3 expression analysis, epistasis with STAT5 and FOXO1 mutants","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — RNAi with mutant rescue and phosphorylation readout, single lab","pmids":["26815406"],"is_preprint":false},{"year":2017,"finding":"PTPN2 deletion in melanoma tumor cells increases the efficacy of PD-1 checkpoint immunotherapy by enhancing IFN-gamma-mediated effects on antigen presentation (MHC-I upregulation) and growth suppression via the JAK-STAT pathway.","method":"In vivo CRISPR-Cas9 pooled screen in transplantable melanoma + PD-1 blockade, validation with individual gene deletion, IFN-gamma signaling assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — in vivo CRISPR screen with mechanistic validation, highly replicated finding","pmids":["28723893"],"is_preprint":false},{"year":2017,"finding":"PTPN2 regulates αβ vs. γδ T cell lineage commitment by attenuating STAT5 signaling (for T-cell lineage commitment) and LCK/STAT5 signaling (for αβ vs γδ specification) in the thymus.","method":"T-cell-specific PTPN2-deficient mice, thymic subset analysis by flow cytometry, LCK and STAT5 phosphorylation assays","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with signaling readouts, single lab","pmids":["28798028"],"is_preprint":false},{"year":2018,"finding":"TRIM59 promotes glioblastoma by physically interacting with nuclear STAT3 and preventing TC45-mediated dephosphorylation of STAT3 pY705, thereby sustaining STAT3 transcriptional activation downstream of EGFR signaling.","method":"Co-immunoprecipitation of TRIM59-STAT3, TC45 dephosphorylation assay, TRIM59/PTPN2 KD, orthotopic xenograft","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP with functional dephosphorylation assay and in vivo validation, single lab","pmids":["29386185"],"is_preprint":false},{"year":2018,"finding":"Myeloid cell-specific PTPN2 deletion promotes inflammasome activation and elevated IL-1β production by increasing phosphorylation of the inflammasome adaptor ASC, identifying PTPN2 as a direct regulator of inflammasome assembly in macrophages.","method":"PTPN2-LysMCre mice, inflammasome assays, ASC phosphorylation Western blot, IL-1β ELISA, IL-1β blocking antibody rescue","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific KO with molecular mechanism (ASC phosphorylation) and cytokine rescue, multiple readouts","pmids":["29444435"],"is_preprint":false},{"year":2019,"finding":"PTPN2 deletion in CD8+ T cells increases JAK-STAT signaling (LCK activation and STAT5 phosphorylation) and CXCL9/10-directed homing, enhancing CAR T-cell activation and anti-tumor efficacy against HER-2+ solid tumors in vivo.","method":"T-cell-specific PTPN2-deficient mice, CAR T-cell adoptive transfer, LCK phosphorylation and STAT5 signaling assays, tumor homing experiments","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined signaling mechanism and in vivo functional validation","pmids":["31803974"],"is_preprint":false},{"year":2019,"finding":"PTPN2 deletion in CD8+ T cells increases generation of Tim-3+ terminally exhausted T cells and their cytotoxicity by attenuating type I interferon signaling; this is mechanistically distinct from effects on Slamf6+ progenitor exhausted cells.","method":"Ptpn2-conditional KO in CD8+ T cells, LCMV clone 13 infection model, tumor models, flow cytometry, IFN signaling assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with mechanistic (type I IFN signaling) and functional (cytotoxicity, tumor control) validation","pmids":["31527834"],"is_preprint":false},{"year":2019,"finding":"PTPN2 dephosphorylates STAT3 in Tregs to inhibit IL-6-driven loss of FoxP3; reduced PTPN2 expression promotes pathogenic conversion of RORγt+ Tregs into IL-17-producing exTregs, thereby exacerbating autoimmune arthritis.","method":"SKG mouse arthritis model with Ptpn2 haploinsufficiency, Treg-specific PTPN2 deletion, STAT3 phosphorylation assays, FoxP3 stability assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific haploinsufficiency with defined molecular substrate (STAT3) and functional autoimmune readout","pmids":["30620725"],"is_preprint":false},{"year":2020,"finding":"PTPN2 loss in macrophages increases CEACAM1/CEACAM6 expression (promoting bacterial uptake), impairs autophagy, and reduces lysosomal acidification, thereby compromising clearance of adherent-invasive E. coli; in vivo, macrophage-specific PTPN2 KO mice are more susceptible to AIEC infection.","method":"PTPN2-LysMCre mice, IBD-patient macrophages, bacterial invasion/survival assays, CEACAM expression analysis, autophagy flux, lysosomal pH assay","journal":"Gut","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific KO plus patient-derived cells with three mechanistically distinct readouts validated in vivo","pmids":["33563644"],"is_preprint":false},{"year":2020,"finding":"PTPN2 loss in macrophages promotes an inflammatory macrophage phenotype and elevated IL-6 secretion that disrupts intestinal epithelial barrier function; anti-IL-6 antibody reverses this effect in both co-culture and in vivo Ptpn2-LysMCre mice.","method":"Macrophage-IEC co-culture, PTPN2 siRNA/shRNA KD, Ptpn2-LysMCre mice, TEER/permeability assays, anti-IL-6 antibody rescue, IBD-patient macrophages","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with mechanistic rescue (anti-IL6) and validation in patient-derived cells and in vivo model","pmids":["32652144"],"is_preprint":false},{"year":2020,"finding":"PTPN2 negatively regulates KRAS plasma membrane localization and activation by dephosphorylating tyrosine-phosphorylated KRAS; PTPN2 knockdown reduces KRAS membrane association, impairs KRAS downstream signaling, reduces proliferation, and promotes apoptosis specifically in KRAS-dependent cancer cells.","method":"High-content imaging screen, PTPN2 KD/KO, KRAS membrane localization assay, KRAS tyrosine phosphorylation Western blot, proliferation and apoptosis assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — functional screen with defined molecular mechanism (KRAS tyrosine phosphorylation), single lab","pmids":["33122197"],"is_preprint":false},{"year":2011,"finding":"TC45 dephosphorylates tyrosine residues of c-Fos (Y10 and Y30), enabling c-Fos association with the endoplasmic reticulum membranes and activation of phospholipid synthesis; induction of cell growth promotes TC45 nuclear-to-cytoplasmic translocation coincident with its activation.","method":"In vivo and in vitro dephosphorylation assays, TC45 translocation microscopy, ER-association and phospholipid synthesis functional assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro dephosphorylation plus in vivo localization linked to functional consequence, single lab","pmids":["22105363"],"is_preprint":false},{"year":2021,"finding":"The C-terminal intrinsically disordered tail of TCPTP acts as an intramolecular autoinhibitory element that suppresses catalytic activity; integrin-alpha-1 cytosolic tail displaces this autoinhibitory tail via competitive binding to activate TCPTP.","method":"Solution NMR, small-angle X-ray scattering (SAXS), chemical cross-linking/mass spectrometry, biochemical phosphatase activity assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — multiple structural methods (NMR, SAXS, XL-MS) combined with biochemical validation in single rigorous study","pmids":["35013194"],"is_preprint":false},{"year":2021,"finding":"Crystal structures of TCPTP at 1.7 Å and 1.9 Å resolution reveal that helix α7 at the C-terminus functions as an allosteric regulator of catalytic efficiency; truncation or deletion of helix α7 reduces TCPTP catalytic efficiency ~4-fold.","method":"X-ray crystallography, mutagenesis (α7 truncation/deletion), in vitro phosphatase activity assays","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus mutagenesis with activity assay","pmids":["34910875"],"is_preprint":false},{"year":2013,"finding":"miR-210, induced by ROS/hypoxia via PDGFR-β/Akt/ERK and NF-κB/Elk1 pathways, directly targets the PTPN2 3'UTR (validated by luciferase assay) to downregulate PTPN2 protein and thereby promote proliferation and migration of adipose-derived stem cells.","method":"Luciferase 3'UTR reporter assay, miR-210 mimic/inhibitor, PTPN2 siRNA, proliferation/migration assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — direct 3'UTR luciferase validation with functional KD phenotype, single lab","pmids":["23579275"],"is_preprint":false},{"year":2019,"finding":"Benzene metabolite 1,4-benzoquinone irreversibly inhibits PTPN2 by forming a covalent adduct at the catalytic cysteine residue (kinact = 645 M-1·s-1), leading to increased STAT1 tyrosine phosphorylation and STAT1-regulated gene expression in cells.","method":"In vitro kinetic assay with purified human PTPN2, mass spectrometry identification of covalent adduct, cell-based STAT1 phosphorylation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinetic/mechanistic characterization with MS and cell validation","pmids":["31248982"],"is_preprint":false},{"year":2013,"finding":"Mitoxantrone directly binds the catalytic domain of TCPTP at a hydrophobic groove near the active site and activates its phosphatase activity; this binding site is also used by the integrin alpha-1 cytoplasmic peptide.","method":"Molecular modeling, biochemical binding assays, in vitro phosphatase activity assays, identification of binding site residues","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 — combined computational and biochemical validation, single lab","pmids":["23856547"],"is_preprint":false},{"year":2016,"finding":"PASD1 competes with TC45 to associate with nuclear STAT3, thereby preventing TC45-mediated dephosphorylation of STAT3 pY705 and sustaining STAT3 transcriptional activation and tumor growth.","method":"Endogenous co-immunoprecipitation of PASD1-STAT3 and PASD1-TC45, PASD1/TC45 competition assay, STAT3 pY705 Western blot, tumor xenograft","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP competition with phosphorylation and in vivo tumor readout, single lab","pmids":["26892021"],"is_preprint":false},{"year":2022,"finding":"TRIM32 physically associates with nuclear STAT3 and suppresses TC45-induced dephosphorylation of STAT3, promoting STAT3 transcriptional activation and radioresistance in triple-negative breast cancer.","method":"Co-immunoprecipitation, TC45-STAT3 dephosphorylation assay, TRIM32 KD, radioresistance functional assays in vitro and in vivo","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP with dephosphorylation assay and functional validation, single lab","pmids":["35091679"],"is_preprint":false},{"year":2021,"finding":"lncRNA TINCR directly binds the phosphatase domain of TCPTP and inhibits its tyrosine phosphatase activity, thereby preventing STAT3 dephosphorylation and maintaining STAT3 activation to promote HCC proliferation and invasion.","method":"RNA pulldown, LC-MS/MS, RNA immunoprecipitation, STAT3 phosphatase activity assay with domain-deletion TINCR constructs, functional cell assays","journal":"Bioengineered","confidence":"Medium","confidence_rationale":"Tier 2 — RNA pulldown with domain mapping and phosphatase activity assay, single lab","pmids":["34057016"],"is_preprint":false},{"year":2023,"finding":"ABBV-CLS-484 (AC484) is a first-in-class, orally bioavailable active-site inhibitor of both PTPN2 and PTP1B; it amplifies interferon JAK-STAT signaling, promotes NK cell and CD8+ T cell function, and generates potent anti-tumor immunity in PD-1-resistant mouse tumor models.","method":"Active-site inhibitor characterization, in vitro cytokine signaling assays (JAK-STAT), in vivo mouse tumor models with immune cell analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — first active-site inhibitor with biochemical characterization, multiple orthogonal in vitro and in vivo validations","pmids":["37794185"],"is_preprint":false},{"year":2018,"finding":"TC-PTP directly interacts with and dephosphorylates Flk-1 (VEGFR2/KDR) in keratinocytes after UVB exposure (demonstrated by substrate-trapping TC-PTP-D182A co-immunoprecipitation), suppressing Flk-1/JNK survival signaling and promoting UVB-induced apoptosis.","method":"Substrate-trapping mutant (D182A) immunoprecipitation, Flk-1 phosphorylation Western blot, epidermal-specific TC-PTP KO mice, Flk-1 siRNA/inhibitor rescue","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — substrate-trapping with KO and pharmacological validation, single lab","pmids":["29955047"],"is_preprint":false}],"current_model":"PTPN2/TCPTP is a non-receptor protein tyrosine phosphatase that exists as two isoforms (nuclear TC45 and ER-targeted TC48), both of which are kept basally inactive by an autoinhibitory C-terminal disordered tail that is displaced by the integrin-alpha-1 cytosolic tail or other activators; upon activation, TCPTP dephosphorylates a broad set of substrates—including the insulin receptor, EGFR, VEGFR2, Flk-1, KRAS, CSF-1R, JAK1, SFKs, STAT1, STAT3, STAT5, and C3G—to attenuate growth-factor, cytokine (IFN-gamma, IL-2, IL-6, leptin), and oncogenic kinase signaling, and its nuclear exit is regulated by cellular stress via AMPK; in immune cells PTPN2 restrains TCR signaling, limits T-cell exhaustion differentiation, controls Treg stability through STAT3 dephosphorylation, and regulates inflammasome assembly via ASC dephosphorylation, while its loss in tumor cells enhances IFN-gamma-driven antigen presentation and anti-tumor immunity."},"narrative":{"teleology":[{"year":1999,"claim":"Establishing that TC45 is not merely a nuclear phosphatase but exits the nucleus upon growth factor stimulation to dephosphorylate EGFR and suppress PI3K/Akt and JNK signaling resolved the question of how a predominantly nuclear PTP could regulate cytoplasmic RTK pathways.","evidence":"Substrate-trapping TC45-D182A overexpression with pharmacological inhibitors and signaling readouts in mammalian cells","pmids":["10488121"],"confidence":"High","gaps":["Mechanism of nuclear exit not yet defined","Whether TC45 directly or indirectly targets PI3K not resolved"]},{"year":2001,"claim":"Demonstrating that hyperosmotic stress and AMPK activation trigger CRM1-independent nuclear exit of TC45 defined the upstream signal controlling TCPTP subcellular redistribution, while TC45 action on the oncogenic truncated EGFR (Δ-EGFR) in glioblastoma extended its tumor-suppressor role beyond wild-type EGFR.","evidence":"GFP-TC45 live imaging with leptomycin B and AMPK activators; substrate-trapping plus intracranial xenograft model","pmids":["11479308","11514572"],"confidence":"High","gaps":["Precise AMPK phosphorylation site on TC45 or interacting partner not identified","Whether TC45 nuclear exit is purely passive diffusion in all cell types not confirmed"]},{"year":2003,"claim":"Identification of the insulin receptor as a direct TCPTP substrate, with both TC45 and TC48 isoforms forming stable complexes with IR-β and TCPTP-/- MEFs showing enhanced insulin signaling rescuable by either isoform, established TCPTP as a physiological brake on insulin signaling.","evidence":"Substrate-trapping D182A Co-IP, TCPTP-/- MEF rescue, phospho-Western blot","pmids":["12612081"],"confidence":"High","gaps":["Tissue-specific in vivo roles of TC45 vs TC48 in insulin signaling not dissected","Site-specific IR dephosphorylation not fully mapped"]},{"year":2004,"claim":"Two concurrent discoveries revealed complementary regulatory axes: insulin-induced ROS transiently oxidizes and inactivates TC45 to permit signaling, and integrin-α1 binding directly activates TCPTP upon cell adhesion—establishing that TCPTP activity is bidirectionally regulated by redox state and integrin engagement.","evidence":"In-gel PTP activity assay with ROS manipulation; Co-IP of integrin-α1 tail with TCPTP plus phosphatase activity assay","pmids":["15192089","15592458"],"confidence":"High","gaps":["Whether ROS-mediated inhibition and integrin-mediated activation operate simultaneously or sequentially not tested","Structural basis of integrin-α1-mediated activation not yet resolved"]},{"year":2005,"claim":"Demonstrating that PTP1B and TCPTP dephosphorylate overlapping but distinct IR phosphosites and control distinct downstream pathways (ERK1/2 vs sustained pY1162/1163) resolved the non-redundancy between these two closely related PTPs in insulin signaling.","evidence":"PTP1B-/- and TCPTP-/- MEFs, double knockdown, phosphosite-specific antibodies","pmids":["15632081"],"confidence":"High","gaps":["Basis for substrate-site selectivity between PTP1B and TCPTP not structurally explained"]},{"year":2006,"claim":"Identification of CSF-1R as a TCPTP substrate in macrophages and TC48 localization to the ER via interaction with p25 expanded the substrate repertoire to hematopoietic receptors and provided the first mechanism for TC48 subcellular targeting.","evidence":"Substrate-trapping in TCPTP-/- macrophages with colony assays; yeast two-hybrid and Co-IP for p25-TC48 with ER localization microscopy","pmids":["16705167","16595549"],"confidence":"High","gaps":["Whether p25 regulates TC48 catalytic activity or only localization not determined","Reciprocal IP for p25-TC48 lacking"]},{"year":2008,"claim":"Establishing VEGFR2 as a direct TCPTP substrate whose dephosphorylation inhibits receptor internalization and endothelial cell function, and demonstrating cell-cycle-dependent regulation of SFK/JAK1/STAT3 by TCPTP, broadened TCPTP's role to angiogenesis and proliferative control.","evidence":"Substrate-trapping Co-IP with VEGFR2, endothelial functional assays; TCPTP-/- MEFs with cell cycle analysis and pharmacological kinase inhibitors","pmids":["18840653","18948751"],"confidence":"High","gaps":["Which VEGFR2 phosphosites are dephosphorylated and how this prevents internalization not fully mapped","Whether SFK is a direct or indirect substrate in cell cycle context not resolved"]},{"year":2011,"claim":"Multiple studies converged to show that TCPTP functions as a tumor suppressor in T-ALL (via JAK1/CSF-1R dephosphorylation), dephosphorylates c-Fos to enable ER-associated phospholipid synthesis, and dephosphorylates Golgi-localized C3G via the TC48 isoform, expanding the compartmentalized substrate repertoire.","evidence":"T-ALL patient samples with JAK kinase assays; in vitro c-Fos dephosphorylation with ER functional assays; TC48 substrate-trapping at Golgi with neurite outgrowth readout","pmids":["21551237","22105363","21876762"],"confidence":"Medium","gaps":["Clinical significance of PTPN2 deletion frequency in T-ALL requires larger cohorts","Physiological regulation of TC48 activity at the Golgi unknown","c-Fos as in vivo substrate not confirmed by genetic approaches"]},{"year":2012,"claim":"Demonstrating that phospho-Ser727 on STAT3 promotes TC45-mediated pY705 dephosphorylation provided a substrate-recognition mechanism, while TCPTP loss in triple-negative breast cancer elevated SFK/STAT3 signaling and promoted tumorigenesis, establishing TCPTP as a breast cancer tumor suppressor.","evidence":"STAT3 S727A/S727D mutants in HepG2 cells with TC45 KD/OE; TCPTP-/- mammary fat pad, RNAi in breast cancer lines, xenograft","pmids":["22233524","23166300"],"confidence":"High","gaps":["Structural basis of Ser727-dependent recognition by TC45 not resolved","Whether PTPN2 loss is a driver or passenger in human breast cancer not established"]},{"year":2014,"claim":"Showing that PTPN2 deficiency in CD8+ T cells causes rapid lymphopenia-induced proliferation via elevated TCR (but not IL-7) signaling established PTPN2 as a selective restraint on TCR-driven T cell homeostatic responses and a potential autoimmunity checkpoint.","evidence":"T-cell-specific PTPN2-KO mice, adoptive transfer into lymphopenic hosts, TCR signaling readouts","pmids":["24445916"],"confidence":"High","gaps":["Direct TCR-proximal substrate(s) of PTPN2 in CD8+ T cells not conclusively identified","Whether LCK is the primary direct substrate not formally tested"]},{"year":2017,"claim":"An in vivo CRISPR screen identified PTPN2 deletion in tumor cells as a sensitizer to PD-1 immunotherapy via enhanced IFN-γ/JAK-STAT-driven antigen presentation, while PTPN2's role in thymic lineage commitment via LCK/STAT5 further defined its importance in T cell development.","evidence":"In vivo CRISPR-Cas9 screen in melanoma with anti-PD-1, IFN-γ signaling validation; T-cell-specific PTPN2-KO mice with thymic subset and signaling analysis","pmids":["28723893","28798028"],"confidence":"High","gaps":["Whether PTPN2 loss in human tumors similarly sensitizes to checkpoint therapy not confirmed clinically","Relative contribution of STAT5 vs LCK dephosphorylation to lineage commitment not quantified"]},{"year":2018,"claim":"Cell-type-specific knockouts revealed that myeloid PTPN2 directly controls inflammasome assembly via ASC dephosphorylation and that nuclear STAT3 can be shielded from TC45 by the oncoprotein TRIM59 in glioblastoma, defining both a new innate immune substrate and a competition-based regulatory mechanism.","evidence":"PTPN2-LysMCre mice with ASC phosphorylation and IL-1β assays; TRIM59-STAT3-TC45 Co-IP and orthotopic xenograft","pmids":["29444435","29386185"],"confidence":"High","gaps":["Which ASC tyrosine residue(s) PTPN2 dephosphorylates not identified","Whether TRIM59-TC45 competition is stoichiometric or catalytic not resolved"]},{"year":2019,"claim":"Multiple 2019 studies established that PTPN2 deletion in CD8+ T cells enhances anti-tumor immunity (including CAR T efficacy) through LCK/STAT5 amplification and CXCL9/10-directed homing, while also increasing terminal T cell exhaustion via type I IFN signaling; concurrently, PTPN2 was shown to maintain Treg stability by dephosphorylating STAT3 to prevent IL-6-driven FoxP3 loss.","evidence":"Conditional PTPN2 KO in CD8+ T cells with CAR T adoptive transfer and LCMV/tumor models; Treg-specific PTPN2 deletion in SKG arthritis model with STAT3 pY readout","pmids":["31803974","31527834","30620725"],"confidence":"High","gaps":["How PTPN2 differentially regulates type I vs type II IFN signaling mechanistically not resolved","Whether enhanced exhaustion-driven cytotoxicity is durable long-term not tested"]},{"year":2020,"claim":"Macrophage-specific PTPN2 loss was shown to promote intestinal inflammation through IL-6-mediated epithelial barrier disruption and impaired clearance of adherent-invasive E. coli (via increased CEACAM expression and reduced autophagy/lysosomal function), linking PTPN2 to IBD pathogenesis at the mechanistic level.","evidence":"PTPN2-LysMCre mice, IBD-patient macrophages, bacterial survival assays, TEER/permeability with anti-IL-6 rescue","pmids":["33563644","32652144"],"confidence":"High","gaps":["Whether PTPN2 directly dephosphorylates autophagy or lysosomal substrates not determined","Contribution of PTPN2 loss in macrophages vs epithelial cells to human IBD not separated"]},{"year":2021,"claim":"Structural studies using NMR/SAXS and X-ray crystallography resolved the autoinhibitory mechanism: the C-terminal disordered tail occludes the active site and is competitively displaced by integrin-α1, while helix α7 allosterically enhances catalytic efficiency ~4-fold, providing a unified structural framework for TCPTP activation.","evidence":"Solution NMR, SAXS, XL-MS, biochemical assays; 1.7–1.9 Å crystal structures with α7 truncation mutagenesis","pmids":["35013194","34910875"],"confidence":"High","gaps":["Full-length TCPTP structure including the disordered tail not captured crystallographically","Whether other activators (e.g. mitoxantrone, endogenous ligands) use the same displacement mechanism not confirmed structurally"]},{"year":2023,"claim":"Development of AC484 (ABBV-CLS-484), a first-in-class dual PTPN2/PTP1B active-site inhibitor, demonstrated that pharmacological PTPN2 inhibition amplifies IFN-γ/JAK-STAT signaling and promotes NK and CD8+ T cell-mediated anti-tumor immunity even in PD-1-resistant settings, validating PTPN2 as a druggable immuno-oncology target.","evidence":"Active-site inhibitor biochemical characterization, cytokine signaling assays, multiple syngeneic mouse tumor models","pmids":["37794185"],"confidence":"High","gaps":["Selectivity over other PTPs in vivo not fully characterized","Clinical efficacy and toxicity in humans not yet established","Whether combined PTPN2/PTP1B inhibition causes autoimmune adverse effects not determined"]},{"year":null,"claim":"Key unresolved questions include the full structural basis of isoform-specific substrate selection (TC45 vs TC48), the direct substrates mediating PTPN2's effects on autophagy and lysosomal function, and whether therapeutic PTPN2 inhibition can achieve immune activation without autoimmune toxicity in humans.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length structure of either isoform","Autophagy/lysosomal substrates not identified","Human clinical safety/efficacy data not available"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,3,4,5,7,8,9,10,13,14,16,20,23,24,25,26,29,30,34,39,40]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,2,31,32]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,6,14,22,36,37]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[15,30]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[6,30]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[15,16]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,2,3,4,8,9,10,12,20,24,29,39]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[18,20,23,24,25,26,27,28,39]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[5,11,13,20,22,37]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[21]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[9,17]}],"complexes":[],"partners":["ITGA1","STAT3","STAT1","STAT5","INSR","EGFR","KDR","CSF1R"],"other_free_text":[]},"mechanistic_narrative":"PTPN2 (also known as TC-PTP/TCPTP) is a non-receptor protein tyrosine phosphatase that serves as a central negative regulator of receptor tyrosine kinase, JAK-STAT, and Src family kinase signaling across multiple cell types. It exists as two splice isoforms—nuclear TC45 and ER-localized TC48—both of which are kept basally inactive by an autoinhibitory C-terminal intrinsically disordered tail that is displaced upon binding of activators such as the integrin-α1 cytoplasmic tail, and both share a catalytic domain whose efficiency depends on an allosteric helix α7 [PMID:35013194, PMID:34910875]. PTPN2 directly dephosphorylates the insulin receptor, EGFR, VEGFR2, CSF-1R, KRAS, JAK1, SFKs, STAT1, STAT3, STAT5, ASC, and c-Fos, thereby attenuating growth factor, cytokine (IFN-γ, IL-2, IL-6, leptin), and inflammasome signaling [PMID:12612081, PMID:10488121, PMID:18840653, PMID:16705167, PMID:29444435, PMID:22000926]. In the immune system, PTPN2 restrains TCR-driven T cell proliferation, controls Treg stability through STAT3 dephosphorylation, limits CD8+ T cell exhaustion differentiation, and suppresses macrophage-driven inflammation; accordingly, tumor-cell or T-cell PTPN2 deletion enhances anti-tumor immunity and responsiveness to PD-1 checkpoint blockade, and pharmacological PTPN2/PTP1B inhibition (AC484) phenocopies these effects [PMID:24445916, PMID:30620725, PMID:31527834, PMID:28723893, PMID:37794185]."},"prefetch_data":{"uniprot":{"accession":"P17706","full_name":"Tyrosine-protein phosphatase non-receptor type 2","aliases":["T-cell protein-tyrosine phosphatase","TCPTP"],"length_aa":415,"mass_kda":48.5,"function":"Non-receptor type tyrosine-specific phosphatase that dephosphorylates receptor protein tyrosine kinases including INSR, EGFR, CSF1R, PDGFR. Also dephosphorylates non-receptor protein tyrosine kinases like JAK1, JAK2, JAK3, Src family kinases, STAT1, STAT3 and STAT6 either in the nucleus or the cytoplasm. Negatively regulates numerous signaling pathways and biological processes like hematopoiesis, inflammatory response, cell proliferation and differentiation, and glucose homeostasis. Plays a multifaceted and important role in the development of the immune system. Functions in T-cell receptor signaling through dephosphorylation of FYN and LCK to control T-cells differentiation and activation. Dephosphorylates CSF1R, negatively regulating its downstream signaling and macrophage differentiation. Negatively regulates cytokine (IL2/interleukin-2 and interferon)-mediated signaling through dephosphorylation of the cytoplasmic kinases JAK1, JAK3 and their substrate STAT1, that propagate signaling downstream of the cytokine receptors. Also regulates the IL6/interleukin-6 and IL4/interleukin-4 cytokine signaling through dephosphorylation of STAT3 and STAT6 respectively. In addition to the immune system, it is involved in anchorage-dependent, negative regulation of EGF-stimulated cell growth. Activated by the integrin ITGA1/ITGB1, it dephosphorylates EGFR and negatively regulates EGF signaling. Dephosphorylates PDGFRB and negatively regulates platelet-derived growth factor receptor-beta signaling pathway and therefore cell proliferation. Negatively regulates tumor necrosis factor-mediated signaling downstream via MAPK through SRC dephosphorylation. May also regulate the hepatocyte growth factor receptor signaling pathway through dephosphorylation of the hepatocyte growth factor receptor MET. Also plays an important role in glucose homeostasis. For instance, negatively regulates the insulin receptor signaling pathway through the dephosphorylation of INSR and control gluconeogenesis and liver glucose production through negative regulation of the IL6 signaling pathways. May also bind DNA","subcellular_location":"Nucleus; Cytoplasm; Cell membrane","url":"https://www.uniprot.org/uniprotkb/P17706/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PTPN2","classification":"Not Classified","n_dependent_lines":18,"n_total_lines":1208,"dependency_fraction":0.014900662251655629},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PSMC5","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/PTPN2","total_profiled":1310},"omim":[{"mim_id":"616628","title":"FAMILY WITH SEQUENCE SIMILARITY 220, MEMBER A; FAM220A","url":"https://www.omim.org/entry/616628"},{"mim_id":"612354","title":"INFLAMMATORY BOWEL DISEASE 21; IBD21","url":"https://www.omim.org/entry/612354"},{"mim_id":"611873","title":"REGULATOR OF MICROTUBULE DYNAMICS 3; RMDN3","url":"https://www.omim.org/entry/611873"},{"mim_id":"610562","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 12A; ZC3H12A","url":"https://www.omim.org/entry/610562"},{"mim_id":"606951","title":"INTERFERON-INDUCED HELICASE C DOMAIN-CONTAINING PROTEIN 1; IFIH1","url":"https://www.omim.org/entry/606951"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":92.9}],"url":"https://www.proteinatlas.org/search/PTPN2"},"hgnc":{"alias_symbol":["TCELLPTP","TC-PTP","TCPTP","TC45","TC48"],"prev_symbol":["PTPT"]},"alphafold":{"accession":"P17706","domains":[{"cath_id":"3.90.190.10","chopping":"3-292","consensus_level":"high","plddt":95.762,"start":3,"end":292},{"cath_id":"1.20.5","chopping":"351-415","consensus_level":"medium","plddt":78.8549,"start":351,"end":415}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P17706","model_url":"https://alphafold.ebi.ac.uk/files/AF-P17706-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P17706-F1-predicted_aligned_error_v6.png","plddt_mean":85.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PTPN2","jax_strain_url":"https://www.jax.org/strain/search?query=PTPN2"},"sequence":{"accession":"P17706","fasta_url":"https://rest.uniprot.org/uniprotkb/P17706.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P17706/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P17706"}},"corpus_meta":[{"pmid":"28723893","id":"PMC_28723893","title":"In 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Both TC48 and TC45 isoforms form stable complexes with the tyrosine-phosphorylated IR beta-subunit (shown by substrate-trapping mutant D182A), and TCPTP-/- MEFs exhibit enhanced insulin-induced IR phosphorylation and PKB/Akt activation that is rescued by physiological re-expression of either isoform.\",\n      \"method\": \"Substrate-trapping mutant (D182A) co-immunoprecipitation, TCPTP-/- MEF rescue experiments, phosphorylation-specific Western blot\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — substrate-trapping plus genetic KO rescue, replicated in follow-up studies\",\n      \"pmids\": [\"12612081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Insulin stimulation induces rapid, transient oxidation and inhibition of TC45 (the 45-kDa TCPTP isoform) via reactive oxygen species, establishing reversible oxidation as a physiological mechanism to transiently relieve TC45-mediated suppression of insulin receptor signaling.\",\n      \"method\": \"In-gel PTP activity assay, RNAi knockdown, substrate-trapping mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro PTP assay combined with RNAi and substrate-trapping, multiple orthogonal methods\",\n      \"pmids\": [\"15192089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The cytoplasmic tail of integrin alpha-1 directly interacts with TCPTP and activates its phosphatase activity upon cell adhesion to collagen, resulting in reduced EGFR phosphorylation after EGF stimulation.\",\n      \"method\": \"Co-immunoprecipitation of alpha-1 integrin tail with TCPTP, cell-permeable peptide competition assay, phosphatase activity assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding and activation demonstrated biochemically with functional readout; replicated in subsequent structural studies\",\n      \"pmids\": [\"15592458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PTP1B and TCPTP act coordinately but non-redundantly to regulate IR phosphorylation: PTP1B controls IR Y1162/Y1163 and Y972 phosphorylation and ERK1/2 signaling, whereas TCPTP controls Y972 phosphorylation and sustains Y1162/Y1163 dephosphorylation, with both contributing to PI3K/Akt signaling.\",\n      \"method\": \"PTP1B-/- and TCPTP-/- MEFs, RNAi suppression of TCPTP in PTP1B-/- background, phosphorylation-site-specific antibodies\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO plus RNAi with site-specific phospho-antibody readout, independent labs\",\n      \"pmids\": [\"15632081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"TC45 exits the nucleus upon EGF receptor activation, dephosphorylates the EGFR, inhibits EGF-dependent PI3K/PKB-Akt and JNK (but not ERK2) activation, and suppresses integrin-mediated Akt activation by acting upstream of PI3K to prevent p85 recruitment.\",\n      \"method\": \"TC45 and TC45-D182A substrate-trapping overexpression, pharmacological PI3K/EGFR inhibitors, signaling readouts\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — substrate-trapping mutant with multiple orthogonal pathway readouts\",\n      \"pmids\": [\"10488121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"TC45 dephosphorylates Delta-EGFR (a truncated, constitutively active EGFR mutant) in glioblastoma cells, inhibiting ERK2 and PI3K signaling and suppressing tumor growth in vivo.\",\n      \"method\": \"TC45-D182A substrate-trapping, signaling Western blots, anchorage-independent growth assay, intracranial xenograft mouse model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — substrate-trapping with in vitro and in vivo functional validation\",\n      \"pmids\": [\"11514572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Hyperosmotic and other specific cellular stresses (those that activate AMP-activated protein kinase, AMPK) cause reversible cytoplasmic redistribution of TC45, which then dephosphorylates EGFR and attenuates JNK signaling; nuclear exit occurs by passive diffusion independent of CRM-1 exportin.\",\n      \"method\": \"GFP-TC45 live imaging, leptomycin B treatment, pharmacological AMPK activators, subcellular fractionation, signaling assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiments linked to functional consequence with pharmacological validation\",\n      \"pmids\": [\"11479308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TCPTP is a negative regulator of CSF-1 receptor (CSF-1R) signaling and macrophage differentiation; the CSF-1R is identified as a physiological substrate of TCPTP via substrate-trapping, and TCPTP-/- macrophages show hyperphosphorylation of CSF-1R and enhanced Grb2/Gab2/Shp2 recruitment and ERK activation.\",\n      \"method\": \"Substrate-trapping experiments, TCPTP-/- mice, colony-forming unit assays, Western blot phosphorylation analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — substrate-trapping plus genetic KO with multiple downstream readouts\",\n      \"pmids\": [\"16705167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TCPTP dephosphorylates VEGFR2 in a phosphosite-specific manner, inhibits its kinase activity and prevents its internalization; TCPTP activity is induced by integrin alpha-1-mediated adhesion to collagen, inhibiting VEGF-triggered endothelial cell proliferation, sprouting, and migration.\",\n      \"method\": \"TCPTP substrate-trapping mutant co-immunoprecipitation with VEGFR2, kinase activity assay, VEGFR2 internalization assay, endothelial cell functional assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — substrate-trapping, biochemical activity assay, and functional cellular assays\",\n      \"pmids\": [\"18840653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TCPTP negatively regulates Src family kinase (SFK), JAK1, and STAT3 signaling in a cell-cycle-dependent manner; enhanced SFK and PI3K (but not JAK1/STAT3) signaling drives the accelerated G1/S transition in TCPTP-deficient cells.\",\n      \"method\": \"TCPTP-/- MEFs, RNAi in HeLa cells, pharmacological kinase inhibitors, cell cycle analysis\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO and RNAi with pharmacological dissection, single lab\",\n      \"pmids\": [\"18948751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PTPN2 knockdown in pancreatic beta-cells amplifies IFN-gamma-induced STAT1 phosphorylation and exacerbates cytokine-induced apoptosis; double knockdown of both PTPN2 and STAT1 protects against cytokine death, placing PTPN2 upstream of STAT1 in IFN-gamma signaling in beta-cells.\",\n      \"method\": \"siRNA knockdown in rat beta-cells and human islets, STAT1 phosphorylation Western blot, cell death assays, epistasis by double KD\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — RNAi epistasis with phosphorylation readout and functional apoptosis outcome in two cell types\",\n      \"pmids\": [\"19336676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TCPTP negatively regulates CSF-1 receptor and oncogenic JAK1 (as well as NUP214-ABL1) in T-ALL; PTPN2 deletion sensitizes lymphoid cells to JAK1-mediated transformation and reduces sensitivity to JAK inhibition.\",\n      \"method\": \"PTPN2 deletion in T-ALL patient samples and functional assays, JAK1 kinase assays, JAK inhibitor sensitivity testing\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional genetic analysis in patient-derived T-ALL cells with kinase substrate evidence\",\n      \"pmids\": [\"21551237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Hypothalamic TCPTP is elevated in obesity and attenuates leptin signaling; neuronal-specific TCPTP deletion enhances leptin sensitivity and protects against diet-induced obesity; combined deletion of TCPTP and PTP1B in neurons has additive anti-obesity effects.\",\n      \"method\": \"Neuron-specific conditional KO mice, intracerebroventricular TCPTP inhibitor, leptin signaling (JAK2/STAT3 phosphorylation), metabolic phenotyping\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with pharmacological validation and additive epistasis, strong phenotypic readout\",\n      \"pmids\": [\"22000926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TCPTP dephosphorylates SFK and regulates STAT3 signaling in breast cancer; TCPTP protein is lost in triple-negative breast cancers, and TCPTP deficiency in murine mammary fat pads or human breast cancer cell lines elevates SFK and STAT3 signaling; TCPTP reconstitution impairs cell proliferation and suppresses tumor growth in vivo.\",\n      \"method\": \"TCPTP-/- murine mammary fat pad, RNAi in human breast cancer lines, TCPTP reconstitution, xenograft mouse model\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO and reconstitution in vitro and in vivo with defined signaling readouts\",\n      \"pmids\": [\"23166300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Phospho-Ser727 on STAT3 promotes TC45-mediated dephosphorylation of STAT3 pY705 to shorten the duration of STAT3 activity; TC45 knockdown causes prolonged pY705 in STAT3-WT but not STAT3-S727A, and TC45 overexpression causes rapid pY705 dephosphorylation only in STAT3-WT, demonstrating a phospho-Ser727-dependent substrate recognition mechanism.\",\n      \"method\": \"STAT3 mutants (S727A, S727D) in STAT3-knockdown HepG2 cells, TC45 KD and overexpression, phospho-specific Western blot\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple STAT3 mutants combined with TC45 KD/OE, mechanistically rigorous\",\n      \"pmids\": [\"22233524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TC48 isoform of TCPTP is localized to the ER via interaction with transmembrane protein p25; p25 coimmunoprecipitates with TC48 and its coexpression enhances ER localization, while a p25 mutant lacking the KKxx ER-retrieval signal causes TC48 Golgi trapping.\",\n      \"method\": \"Yeast two-hybrid screen, coimmunoprecipitation, colocalization microscopy, domain deletion mutants\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, Co-IP plus microscopy, no in vitro reconstitution\",\n      \"pmids\": [\"16595549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TC48 directly dephosphorylates C3G (RapGEF1) at the Golgi; TC48 substrate-trapping mutant forms stable complex with phospho-C3G at the Golgi, and TC48 expression abrogates Src/IGF-induced C3G phosphorylation and inhibits neurite outgrowth in neuroblastoma cells.\",\n      \"method\": \"In vivo and in vitro binding assays, substrate-trapping mutant, co-localization microscopy, C3G phosphorylation assay, neurite outgrowth functional assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — substrate-trapping with co-localization and functional readout, single lab\",\n      \"pmids\": [\"21876762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"TC-PTP-/- MEFs exhibit delayed G1 progression with reduced cyclin D1 induction, sustained p27(KIP1), and decreased IKKβ activity and NF-κB activation following PDGF stimulation; re-introduction of wild-type TC-PTP rescues these defects, identifying TCPTP as a positive regulator of G1 progression via the NF-κB pathway.\",\n      \"method\": \"TC-PTP-/- MEFs, TC-PTP reconstitution, cell cycle analysis, NF-κB reporter assay, IKKβ kinase assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with rescue and multiple downstream readouts, single lab\",\n      \"pmids\": [\"11498795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PTPN2 attenuates T-cell receptor (TCR)-dependent lymphopenia-induced proliferation (LIP) in CD8+ T cells; PTPN2-deficient CD8+ T cells undergo rapid LIP and acquire effector characteristics when transferred into lymphopenic hosts, leading to autoimmunity via elevated TCR signaling (but not IL-7-dependent responses).\",\n      \"method\": \"T-cell-specific PTPN2-deficient mice, adoptive transfer into lymphopenic hosts, TCR signaling readouts, flow cytometry\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with adoptive transfer and mechanistic dissection of TCR vs IL-7 pathways\",\n      \"pmids\": [\"24445916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PTPN2 is induced by TCR activation in iTreg cells to restrain IL-2-mediated STAT5 phosphorylation, thereby promoting FOXP3 depletion; PTPN2 knockdown restores FOXP3 expression despite TCR signaling, placing PTPN2 as a negative regulator of STAT5 that limits FOXP3 stability in iTregs.\",\n      \"method\": \"PTPN2 KD in iTreg cells, STAT5 phosphorylation assay, FOXP3 expression analysis, epistasis with STAT5 and FOXO1 mutants\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNAi with mutant rescue and phosphorylation readout, single lab\",\n      \"pmids\": [\"26815406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PTPN2 deletion in melanoma tumor cells increases the efficacy of PD-1 checkpoint immunotherapy by enhancing IFN-gamma-mediated effects on antigen presentation (MHC-I upregulation) and growth suppression via the JAK-STAT pathway.\",\n      \"method\": \"In vivo CRISPR-Cas9 pooled screen in transplantable melanoma + PD-1 blockade, validation with individual gene deletion, IFN-gamma signaling assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo CRISPR screen with mechanistic validation, highly replicated finding\",\n      \"pmids\": [\"28723893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PTPN2 regulates αβ vs. γδ T cell lineage commitment by attenuating STAT5 signaling (for T-cell lineage commitment) and LCK/STAT5 signaling (for αβ vs γδ specification) in the thymus.\",\n      \"method\": \"T-cell-specific PTPN2-deficient mice, thymic subset analysis by flow cytometry, LCK and STAT5 phosphorylation assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with signaling readouts, single lab\",\n      \"pmids\": [\"28798028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRIM59 promotes glioblastoma by physically interacting with nuclear STAT3 and preventing TC45-mediated dephosphorylation of STAT3 pY705, thereby sustaining STAT3 transcriptional activation downstream of EGFR signaling.\",\n      \"method\": \"Co-immunoprecipitation of TRIM59-STAT3, TC45 dephosphorylation assay, TRIM59/PTPN2 KD, orthotopic xenograft\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with functional dephosphorylation assay and in vivo validation, single lab\",\n      \"pmids\": [\"29386185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Myeloid cell-specific PTPN2 deletion promotes inflammasome activation and elevated IL-1β production by increasing phosphorylation of the inflammasome adaptor ASC, identifying PTPN2 as a direct regulator of inflammasome assembly in macrophages.\",\n      \"method\": \"PTPN2-LysMCre mice, inflammasome assays, ASC phosphorylation Western blot, IL-1β ELISA, IL-1β blocking antibody rescue\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO with molecular mechanism (ASC phosphorylation) and cytokine rescue, multiple readouts\",\n      \"pmids\": [\"29444435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PTPN2 deletion in CD8+ T cells increases JAK-STAT signaling (LCK activation and STAT5 phosphorylation) and CXCL9/10-directed homing, enhancing CAR T-cell activation and anti-tumor efficacy against HER-2+ solid tumors in vivo.\",\n      \"method\": \"T-cell-specific PTPN2-deficient mice, CAR T-cell adoptive transfer, LCK phosphorylation and STAT5 signaling assays, tumor homing experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined signaling mechanism and in vivo functional validation\",\n      \"pmids\": [\"31803974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PTPN2 deletion in CD8+ T cells increases generation of Tim-3+ terminally exhausted T cells and their cytotoxicity by attenuating type I interferon signaling; this is mechanistically distinct from effects on Slamf6+ progenitor exhausted cells.\",\n      \"method\": \"Ptpn2-conditional KO in CD8+ T cells, LCMV clone 13 infection model, tumor models, flow cytometry, IFN signaling assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with mechanistic (type I IFN signaling) and functional (cytotoxicity, tumor control) validation\",\n      \"pmids\": [\"31527834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PTPN2 dephosphorylates STAT3 in Tregs to inhibit IL-6-driven loss of FoxP3; reduced PTPN2 expression promotes pathogenic conversion of RORγt+ Tregs into IL-17-producing exTregs, thereby exacerbating autoimmune arthritis.\",\n      \"method\": \"SKG mouse arthritis model with Ptpn2 haploinsufficiency, Treg-specific PTPN2 deletion, STAT3 phosphorylation assays, FoxP3 stability assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific haploinsufficiency with defined molecular substrate (STAT3) and functional autoimmune readout\",\n      \"pmids\": [\"30620725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PTPN2 loss in macrophages increases CEACAM1/CEACAM6 expression (promoting bacterial uptake), impairs autophagy, and reduces lysosomal acidification, thereby compromising clearance of adherent-invasive E. coli; in vivo, macrophage-specific PTPN2 KO mice are more susceptible to AIEC infection.\",\n      \"method\": \"PTPN2-LysMCre mice, IBD-patient macrophages, bacterial invasion/survival assays, CEACAM expression analysis, autophagy flux, lysosomal pH assay\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO plus patient-derived cells with three mechanistically distinct readouts validated in vivo\",\n      \"pmids\": [\"33563644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PTPN2 loss in macrophages promotes an inflammatory macrophage phenotype and elevated IL-6 secretion that disrupts intestinal epithelial barrier function; anti-IL-6 antibody reverses this effect in both co-culture and in vivo Ptpn2-LysMCre mice.\",\n      \"method\": \"Macrophage-IEC co-culture, PTPN2 siRNA/shRNA KD, Ptpn2-LysMCre mice, TEER/permeability assays, anti-IL-6 antibody rescue, IBD-patient macrophages\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with mechanistic rescue (anti-IL6) and validation in patient-derived cells and in vivo model\",\n      \"pmids\": [\"32652144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PTPN2 negatively regulates KRAS plasma membrane localization and activation by dephosphorylating tyrosine-phosphorylated KRAS; PTPN2 knockdown reduces KRAS membrane association, impairs KRAS downstream signaling, reduces proliferation, and promotes apoptosis specifically in KRAS-dependent cancer cells.\",\n      \"method\": \"High-content imaging screen, PTPN2 KD/KO, KRAS membrane localization assay, KRAS tyrosine phosphorylation Western blot, proliferation and apoptosis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional screen with defined molecular mechanism (KRAS tyrosine phosphorylation), single lab\",\n      \"pmids\": [\"33122197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TC45 dephosphorylates tyrosine residues of c-Fos (Y10 and Y30), enabling c-Fos association with the endoplasmic reticulum membranes and activation of phospholipid synthesis; induction of cell growth promotes TC45 nuclear-to-cytoplasmic translocation coincident with its activation.\",\n      \"method\": \"In vivo and in vitro dephosphorylation assays, TC45 translocation microscopy, ER-association and phospholipid synthesis functional assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro dephosphorylation plus in vivo localization linked to functional consequence, single lab\",\n      \"pmids\": [\"22105363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The C-terminal intrinsically disordered tail of TCPTP acts as an intramolecular autoinhibitory element that suppresses catalytic activity; integrin-alpha-1 cytosolic tail displaces this autoinhibitory tail via competitive binding to activate TCPTP.\",\n      \"method\": \"Solution NMR, small-angle X-ray scattering (SAXS), chemical cross-linking/mass spectrometry, biochemical phosphatase activity assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple structural methods (NMR, SAXS, XL-MS) combined with biochemical validation in single rigorous study\",\n      \"pmids\": [\"35013194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal structures of TCPTP at 1.7 Å and 1.9 Å resolution reveal that helix α7 at the C-terminus functions as an allosteric regulator of catalytic efficiency; truncation or deletion of helix α7 reduces TCPTP catalytic efficiency ~4-fold.\",\n      \"method\": \"X-ray crystallography, mutagenesis (α7 truncation/deletion), in vitro phosphatase activity assays\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus mutagenesis with activity assay\",\n      \"pmids\": [\"34910875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"miR-210, induced by ROS/hypoxia via PDGFR-β/Akt/ERK and NF-κB/Elk1 pathways, directly targets the PTPN2 3'UTR (validated by luciferase assay) to downregulate PTPN2 protein and thereby promote proliferation and migration of adipose-derived stem cells.\",\n      \"method\": \"Luciferase 3'UTR reporter assay, miR-210 mimic/inhibitor, PTPN2 siRNA, proliferation/migration assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct 3'UTR luciferase validation with functional KD phenotype, single lab\",\n      \"pmids\": [\"23579275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Benzene metabolite 1,4-benzoquinone irreversibly inhibits PTPN2 by forming a covalent adduct at the catalytic cysteine residue (kinact = 645 M-1·s-1), leading to increased STAT1 tyrosine phosphorylation and STAT1-regulated gene expression in cells.\",\n      \"method\": \"In vitro kinetic assay with purified human PTPN2, mass spectrometry identification of covalent adduct, cell-based STAT1 phosphorylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinetic/mechanistic characterization with MS and cell validation\",\n      \"pmids\": [\"31248982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Mitoxantrone directly binds the catalytic domain of TCPTP at a hydrophobic groove near the active site and activates its phosphatase activity; this binding site is also used by the integrin alpha-1 cytoplasmic peptide.\",\n      \"method\": \"Molecular modeling, biochemical binding assays, in vitro phosphatase activity assays, identification of binding site residues\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — combined computational and biochemical validation, single lab\",\n      \"pmids\": [\"23856547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PASD1 competes with TC45 to associate with nuclear STAT3, thereby preventing TC45-mediated dephosphorylation of STAT3 pY705 and sustaining STAT3 transcriptional activation and tumor growth.\",\n      \"method\": \"Endogenous co-immunoprecipitation of PASD1-STAT3 and PASD1-TC45, PASD1/TC45 competition assay, STAT3 pY705 Western blot, tumor xenograft\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP competition with phosphorylation and in vivo tumor readout, single lab\",\n      \"pmids\": [\"26892021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM32 physically associates with nuclear STAT3 and suppresses TC45-induced dephosphorylation of STAT3, promoting STAT3 transcriptional activation and radioresistance in triple-negative breast cancer.\",\n      \"method\": \"Co-immunoprecipitation, TC45-STAT3 dephosphorylation assay, TRIM32 KD, radioresistance functional assays in vitro and in vivo\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with dephosphorylation assay and functional validation, single lab\",\n      \"pmids\": [\"35091679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"lncRNA TINCR directly binds the phosphatase domain of TCPTP and inhibits its tyrosine phosphatase activity, thereby preventing STAT3 dephosphorylation and maintaining STAT3 activation to promote HCC proliferation and invasion.\",\n      \"method\": \"RNA pulldown, LC-MS/MS, RNA immunoprecipitation, STAT3 phosphatase activity assay with domain-deletion TINCR constructs, functional cell assays\",\n      \"journal\": \"Bioengineered\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNA pulldown with domain mapping and phosphatase activity assay, single lab\",\n      \"pmids\": [\"34057016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ABBV-CLS-484 (AC484) is a first-in-class, orally bioavailable active-site inhibitor of both PTPN2 and PTP1B; it amplifies interferon JAK-STAT signaling, promotes NK cell and CD8+ T cell function, and generates potent anti-tumor immunity in PD-1-resistant mouse tumor models.\",\n      \"method\": \"Active-site inhibitor characterization, in vitro cytokine signaling assays (JAK-STAT), in vivo mouse tumor models with immune cell analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — first active-site inhibitor with biochemical characterization, multiple orthogonal in vitro and in vivo validations\",\n      \"pmids\": [\"37794185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TC-PTP directly interacts with and dephosphorylates Flk-1 (VEGFR2/KDR) in keratinocytes after UVB exposure (demonstrated by substrate-trapping TC-PTP-D182A co-immunoprecipitation), suppressing Flk-1/JNK survival signaling and promoting UVB-induced apoptosis.\",\n      \"method\": \"Substrate-trapping mutant (D182A) immunoprecipitation, Flk-1 phosphorylation Western blot, epidermal-specific TC-PTP KO mice, Flk-1 siRNA/inhibitor rescue\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — substrate-trapping with KO and pharmacological validation, single lab\",\n      \"pmids\": [\"29955047\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PTPN2/TCPTP is a non-receptor protein tyrosine phosphatase that exists as two isoforms (nuclear TC45 and ER-targeted TC48), both of which are kept basally inactive by an autoinhibitory C-terminal disordered tail that is displaced by the integrin-alpha-1 cytosolic tail or other activators; upon activation, TCPTP dephosphorylates a broad set of substrates—including the insulin receptor, EGFR, VEGFR2, Flk-1, KRAS, CSF-1R, JAK1, SFKs, STAT1, STAT3, STAT5, and C3G—to attenuate growth-factor, cytokine (IFN-gamma, IL-2, IL-6, leptin), and oncogenic kinase signaling, and its nuclear exit is regulated by cellular stress via AMPK; in immune cells PTPN2 restrains TCR signaling, limits T-cell exhaustion differentiation, controls Treg stability through STAT3 dephosphorylation, and regulates inflammasome assembly via ASC dephosphorylation, while its loss in tumor cells enhances IFN-gamma-driven antigen presentation and anti-tumor immunity.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PTPN2 (also known as TC-PTP/TCPTP) is a non-receptor protein tyrosine phosphatase that serves as a central negative regulator of receptor tyrosine kinase, JAK-STAT, and Src family kinase signaling across multiple cell types. It exists as two splice isoforms—nuclear TC45 and ER-localized TC48—both of which are kept basally inactive by an autoinhibitory C-terminal intrinsically disordered tail that is displaced upon binding of activators such as the integrin-α1 cytoplasmic tail, and both share a catalytic domain whose efficiency depends on an allosteric helix α7 [PMID:35013194, PMID:34910875]. PTPN2 directly dephosphorylates the insulin receptor, EGFR, VEGFR2, CSF-1R, KRAS, JAK1, SFKs, STAT1, STAT3, STAT5, ASC, and c-Fos, thereby attenuating growth factor, cytokine (IFN-γ, IL-2, IL-6, leptin), and inflammasome signaling [PMID:12612081, PMID:10488121, PMID:18840653, PMID:16705167, PMID:29444435, PMID:22000926]. In the immune system, PTPN2 restrains TCR-driven T cell proliferation, controls Treg stability through STAT3 dephosphorylation, limits CD8+ T cell exhaustion differentiation, and suppresses macrophage-driven inflammation; accordingly, tumor-cell or T-cell PTPN2 deletion enhances anti-tumor immunity and responsiveness to PD-1 checkpoint blockade, and pharmacological PTPN2/PTP1B inhibition (AC484) phenocopies these effects [PMID:24445916, PMID:30620725, PMID:31527834, PMID:28723893, PMID:37794185].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing that TC45 is not merely a nuclear phosphatase but exits the nucleus upon growth factor stimulation to dephosphorylate EGFR and suppress PI3K/Akt and JNK signaling resolved the question of how a predominantly nuclear PTP could regulate cytoplasmic RTK pathways.\",\n      \"evidence\": \"Substrate-trapping TC45-D182A overexpression with pharmacological inhibitors and signaling readouts in mammalian cells\",\n      \"pmids\": [\"10488121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of nuclear exit not yet defined\", \"Whether TC45 directly or indirectly targets PI3K not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that hyperosmotic stress and AMPK activation trigger CRM1-independent nuclear exit of TC45 defined the upstream signal controlling TCPTP subcellular redistribution, while TC45 action on the oncogenic truncated EGFR (Δ-EGFR) in glioblastoma extended its tumor-suppressor role beyond wild-type EGFR.\",\n      \"evidence\": \"GFP-TC45 live imaging with leptomycin B and AMPK activators; substrate-trapping plus intracranial xenograft model\",\n      \"pmids\": [\"11479308\", \"11514572\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise AMPK phosphorylation site on TC45 or interacting partner not identified\", \"Whether TC45 nuclear exit is purely passive diffusion in all cell types not confirmed\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of the insulin receptor as a direct TCPTP substrate, with both TC45 and TC48 isoforms forming stable complexes with IR-β and TCPTP-/- MEFs showing enhanced insulin signaling rescuable by either isoform, established TCPTP as a physiological brake on insulin signaling.\",\n      \"evidence\": \"Substrate-trapping D182A Co-IP, TCPTP-/- MEF rescue, phospho-Western blot\",\n      \"pmids\": [\"12612081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific in vivo roles of TC45 vs TC48 in insulin signaling not dissected\", \"Site-specific IR dephosphorylation not fully mapped\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Two concurrent discoveries revealed complementary regulatory axes: insulin-induced ROS transiently oxidizes and inactivates TC45 to permit signaling, and integrin-α1 binding directly activates TCPTP upon cell adhesion—establishing that TCPTP activity is bidirectionally regulated by redox state and integrin engagement.\",\n      \"evidence\": \"In-gel PTP activity assay with ROS manipulation; Co-IP of integrin-α1 tail with TCPTP plus phosphatase activity assay\",\n      \"pmids\": [\"15192089\", \"15592458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ROS-mediated inhibition and integrin-mediated activation operate simultaneously or sequentially not tested\", \"Structural basis of integrin-α1-mediated activation not yet resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating that PTP1B and TCPTP dephosphorylate overlapping but distinct IR phosphosites and control distinct downstream pathways (ERK1/2 vs sustained pY1162/1163) resolved the non-redundancy between these two closely related PTPs in insulin signaling.\",\n      \"evidence\": \"PTP1B-/- and TCPTP-/- MEFs, double knockdown, phosphosite-specific antibodies\",\n      \"pmids\": [\"15632081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis for substrate-site selectivity between PTP1B and TCPTP not structurally explained\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identification of CSF-1R as a TCPTP substrate in macrophages and TC48 localization to the ER via interaction with p25 expanded the substrate repertoire to hematopoietic receptors and provided the first mechanism for TC48 subcellular targeting.\",\n      \"evidence\": \"Substrate-trapping in TCPTP-/- macrophages with colony assays; yeast two-hybrid and Co-IP for p25-TC48 with ER localization microscopy\",\n      \"pmids\": [\"16705167\", \"16595549\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether p25 regulates TC48 catalytic activity or only localization not determined\", \"Reciprocal IP for p25-TC48 lacking\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Establishing VEGFR2 as a direct TCPTP substrate whose dephosphorylation inhibits receptor internalization and endothelial cell function, and demonstrating cell-cycle-dependent regulation of SFK/JAK1/STAT3 by TCPTP, broadened TCPTP's role to angiogenesis and proliferative control.\",\n      \"evidence\": \"Substrate-trapping Co-IP with VEGFR2, endothelial functional assays; TCPTP-/- MEFs with cell cycle analysis and pharmacological kinase inhibitors\",\n      \"pmids\": [\"18840653\", \"18948751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which VEGFR2 phosphosites are dephosphorylated and how this prevents internalization not fully mapped\", \"Whether SFK is a direct or indirect substrate in cell cycle context not resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Multiple studies converged to show that TCPTP functions as a tumor suppressor in T-ALL (via JAK1/CSF-1R dephosphorylation), dephosphorylates c-Fos to enable ER-associated phospholipid synthesis, and dephosphorylates Golgi-localized C3G via the TC48 isoform, expanding the compartmentalized substrate repertoire.\",\n      \"evidence\": \"T-ALL patient samples with JAK kinase assays; in vitro c-Fos dephosphorylation with ER functional assays; TC48 substrate-trapping at Golgi with neurite outgrowth readout\",\n      \"pmids\": [\"21551237\", \"22105363\", \"21876762\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Clinical significance of PTPN2 deletion frequency in T-ALL requires larger cohorts\", \"Physiological regulation of TC48 activity at the Golgi unknown\", \"c-Fos as in vivo substrate not confirmed by genetic approaches\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating that phospho-Ser727 on STAT3 promotes TC45-mediated pY705 dephosphorylation provided a substrate-recognition mechanism, while TCPTP loss in triple-negative breast cancer elevated SFK/STAT3 signaling and promoted tumorigenesis, establishing TCPTP as a breast cancer tumor suppressor.\",\n      \"evidence\": \"STAT3 S727A/S727D mutants in HepG2 cells with TC45 KD/OE; TCPTP-/- mammary fat pad, RNAi in breast cancer lines, xenograft\",\n      \"pmids\": [\"22233524\", \"23166300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Ser727-dependent recognition by TC45 not resolved\", \"Whether PTPN2 loss is a driver or passenger in human breast cancer not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showing that PTPN2 deficiency in CD8+ T cells causes rapid lymphopenia-induced proliferation via elevated TCR (but not IL-7) signaling established PTPN2 as a selective restraint on TCR-driven T cell homeostatic responses and a potential autoimmunity checkpoint.\",\n      \"evidence\": \"T-cell-specific PTPN2-KO mice, adoptive transfer into lymphopenic hosts, TCR signaling readouts\",\n      \"pmids\": [\"24445916\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct TCR-proximal substrate(s) of PTPN2 in CD8+ T cells not conclusively identified\", \"Whether LCK is the primary direct substrate not formally tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"An in vivo CRISPR screen identified PTPN2 deletion in tumor cells as a sensitizer to PD-1 immunotherapy via enhanced IFN-γ/JAK-STAT-driven antigen presentation, while PTPN2's role in thymic lineage commitment via LCK/STAT5 further defined its importance in T cell development.\",\n      \"evidence\": \"In vivo CRISPR-Cas9 screen in melanoma with anti-PD-1, IFN-γ signaling validation; T-cell-specific PTPN2-KO mice with thymic subset and signaling analysis\",\n      \"pmids\": [\"28723893\", \"28798028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PTPN2 loss in human tumors similarly sensitizes to checkpoint therapy not confirmed clinically\", \"Relative contribution of STAT5 vs LCK dephosphorylation to lineage commitment not quantified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Cell-type-specific knockouts revealed that myeloid PTPN2 directly controls inflammasome assembly via ASC dephosphorylation and that nuclear STAT3 can be shielded from TC45 by the oncoprotein TRIM59 in glioblastoma, defining both a new innate immune substrate and a competition-based regulatory mechanism.\",\n      \"evidence\": \"PTPN2-LysMCre mice with ASC phosphorylation and IL-1β assays; TRIM59-STAT3-TC45 Co-IP and orthotopic xenograft\",\n      \"pmids\": [\"29444435\", \"29386185\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which ASC tyrosine residue(s) PTPN2 dephosphorylates not identified\", \"Whether TRIM59-TC45 competition is stoichiometric or catalytic not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Multiple 2019 studies established that PTPN2 deletion in CD8+ T cells enhances anti-tumor immunity (including CAR T efficacy) through LCK/STAT5 amplification and CXCL9/10-directed homing, while also increasing terminal T cell exhaustion via type I IFN signaling; concurrently, PTPN2 was shown to maintain Treg stability by dephosphorylating STAT3 to prevent IL-6-driven FoxP3 loss.\",\n      \"evidence\": \"Conditional PTPN2 KO in CD8+ T cells with CAR T adoptive transfer and LCMV/tumor models; Treg-specific PTPN2 deletion in SKG arthritis model with STAT3 pY readout\",\n      \"pmids\": [\"31803974\", \"31527834\", \"30620725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PTPN2 differentially regulates type I vs type II IFN signaling mechanistically not resolved\", \"Whether enhanced exhaustion-driven cytotoxicity is durable long-term not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Macrophage-specific PTPN2 loss was shown to promote intestinal inflammation through IL-6-mediated epithelial barrier disruption and impaired clearance of adherent-invasive E. coli (via increased CEACAM expression and reduced autophagy/lysosomal function), linking PTPN2 to IBD pathogenesis at the mechanistic level.\",\n      \"evidence\": \"PTPN2-LysMCre mice, IBD-patient macrophages, bacterial survival assays, TEER/permeability with anti-IL-6 rescue\",\n      \"pmids\": [\"33563644\", \"32652144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PTPN2 directly dephosphorylates autophagy or lysosomal substrates not determined\", \"Contribution of PTPN2 loss in macrophages vs epithelial cells to human IBD not separated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Structural studies using NMR/SAXS and X-ray crystallography resolved the autoinhibitory mechanism: the C-terminal disordered tail occludes the active site and is competitively displaced by integrin-α1, while helix α7 allosterically enhances catalytic efficiency ~4-fold, providing a unified structural framework for TCPTP activation.\",\n      \"evidence\": \"Solution NMR, SAXS, XL-MS, biochemical assays; 1.7–1.9 Å crystal structures with α7 truncation mutagenesis\",\n      \"pmids\": [\"35013194\", \"34910875\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length TCPTP structure including the disordered tail not captured crystallographically\", \"Whether other activators (e.g. mitoxantrone, endogenous ligands) use the same displacement mechanism not confirmed structurally\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Development of AC484 (ABBV-CLS-484), a first-in-class dual PTPN2/PTP1B active-site inhibitor, demonstrated that pharmacological PTPN2 inhibition amplifies IFN-γ/JAK-STAT signaling and promotes NK and CD8+ T cell-mediated anti-tumor immunity even in PD-1-resistant settings, validating PTPN2 as a druggable immuno-oncology target.\",\n      \"evidence\": \"Active-site inhibitor biochemical characterization, cytokine signaling assays, multiple syngeneic mouse tumor models\",\n      \"pmids\": [\"37794185\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity over other PTPs in vivo not fully characterized\", \"Clinical efficacy and toxicity in humans not yet established\", \"Whether combined PTPN2/PTP1B inhibition causes autoimmune adverse effects not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the full structural basis of isoform-specific substrate selection (TC45 vs TC48), the direct substrates mediating PTPN2's effects on autophagy and lysosomal function, and whether therapeutic PTPN2 inhibition can achieve immune activation without autoimmune toxicity in humans.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length structure of either isoform\", \"Autophagy/lysosomal substrates not identified\", \"Human clinical safety/efficacy data not available\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 3, 4, 5, 7, 8, 9, 10, 13, 14, 16, 20, 23, 24, 25, 26, 29, 30, 34, 39, 40]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2, 31, 32]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 6, 14, 22, 36, 37]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [15, 30]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [6, 30]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [15, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 3, 4, 8, 9, 10, 12, 20, 24, 29, 39]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [18, 20, 23, 24, 25, 26, 27, 28, 39]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [5, 11, 13, 20, 22, 37]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [9, 17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ITGA1\",\n      \"STAT3\",\n      \"STAT1\",\n      \"STAT5\",\n      \"INSR\",\n      \"EGFR\",\n      \"KDR\",\n      \"CSF1R\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}