{"gene":"DUSP22","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2001,"finding":"DUSP22 (JSP-1) is a dual-specificity phosphatase that, contrary to expectation, activates rather than inactivates the MAPK JNK in transient cotransfection assays, functioning as a selective JNK activator (JNK Stimulatory Phosphatase-1).","method":"Transient cotransfection assay in mammalian cells, in vitro phosphatase characterization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — original biochemical characterization with functional assays, independently replicated in follow-up studies","pmids":["11717427"],"is_preprint":false},{"year":2002,"finding":"DUSP22 (JKAP) specifically activates JNK but not p38 or ERK2; it associates with JNK and MKK7 (but not SEK1) in vivo but does not interact with JNK in vitro, indicating an indirect scaffolding-like mechanism. Targeted gene disruption abolished TNF-α- and TGF-β-induced JNK activation.","method":"Co-immunoprecipitation, overexpression and dominant-negative mutant (JKAP-C88S) in HEK293T cells, targeted gene disruption in murine ES cells, JNK activation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including KO, Co-IP, and overexpression with specific kinase readouts","pmids":["12138158"],"is_preprint":false},{"year":2001,"finding":"DUSP22 (VHX) dephosphorylates ERK2 in vitro and suppresses TCR-induced ERK2 activation and NFAT/AP-1 reporter activity (but not NF-κB) when expressed in Jurkat T cells.","method":"In vitro phosphatase assay with ERK2, cotransfection with NFAT/AP-1 and NF-κB luciferase reporters in Jurkat T cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro enzymatic assay plus functional reporter assay in T cells","pmids":["11733513"],"is_preprint":false},{"year":2004,"finding":"DUSP22 (VHX) is N-terminally myristoylated at Gly-2, and this myristoylation is required for its plasma membrane localization; mutation of the myristoylation site abrogates membrane targeting.","method":"Myristoylation site mutagenesis, subcellular localization by fluorescence microscopy in 293T and NIH-3T3 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — direct mutagenesis establishing causality between myristoylation and membrane localization","pmids":["15138252"],"is_preprint":false},{"year":2007,"finding":"DUSP22 associates with estrogen receptor alpha (ERα) in vivo, dephosphorylates ERα at Ser-118, and suppresses ERα-mediated transcription; catalytically inactive DUSP22 mutants fail to suppress ERα activation.","method":"Co-immunoprecipitation in breast cancer cells (T47D), overexpression of WT and catalytic mutants, siRNA knockdown, ERα transcription reporter assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP of endogenous proteins, catalytic mutant controls, siRNA validation, specific phosphorylation site identified","pmids":["17384676"],"is_preprint":false},{"year":2014,"finding":"DUSP22 (JKAP) directly inactivates Lck by dephosphorylating its activating Tyr-394 residue during TCR signaling, thereby suppressing T-cell activation; JKAP-knockout mice develop enhanced T-cell responses and spontaneous autoimmunity.","method":"JKAP-knockout mouse model, in vitro dephosphorylation assay of Lck pTyr394, T-cell proliferation and cytokine production assays, adoptive transfer EAE model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro enzymatic assay identifying specific phosphorylation site, KO mouse with defined phenotype, multiple orthogonal methods","pmids":["24714587"],"is_preprint":false},{"year":2014,"finding":"DUSP22 inhibits PKA activity and thereby regulates TAU phosphorylation status and CREB signaling in hippocampal neurons; DUSP22 promoter hypermethylation in Alzheimer's disease leads to its silencing and consequent PKA-dependent TAU hyperphosphorylation.","method":"DNA methylation profiling of human hippocampus, functional assays showing DUSP22 inhibition of PKA and effects on TAU phosphorylation and CREB activation","journal":"Hippocampus","confidence":"Medium","confidence_rationale":"Tier 2-3 — functional assays linking DUSP22 to PKA/TAU/CREB pathway, but mechanistic detail of direct PKA dephosphorylation not fully reconstituted","pmids":["24436131"],"is_preprint":false},{"year":2016,"finding":"DUSP22 acts as a scaffold protein for the ASK1-MKK7-JNK signaling complex, selectively associating with ASK1, MKK7, and JNK1/2; this scaffold function increases JNK phosphorylation and apoptosis in a concentration-dependent biphasic manner independently of DUSP22 phosphatase activity.","method":"Co-immunoprecipitation of ASK1, MKK7, and JNK with DUSP22; phosphatase-dead DUSP22 mutant overexpression; concentration-dependent JNK phosphorylation and apoptosis assays in mammalian cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP and phosphatase-dead mutant experiments, biphasic dose-response consistent with scaffold function, single lab","pmids":["27711255"],"is_preprint":false},{"year":2019,"finding":"DUSP22 interacts with EGFR and dephosphorylates it, suppressing ERK1/2 signaling; DUSP22 also interacts with androgen receptor (AR) and inhibits EGF-induced AR phosphorylation at Tyr534, suppressing prostate-specific antigen expression in prostate cancer cells.","method":"Co-immunoprecipitation, overexpression of DUSP22 and catalytic mutants in prostate cancer cell lines, ERK1/2 and AR phosphorylation assays, colony formation assays","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP identifying binding partners and specific phosphorylation sites, catalytic mutant controls, single lab","pmids":["31693867"],"is_preprint":false},{"year":2020,"finding":"Crystal structure and NMR analysis of DUSP22 active site revealed that conserved residues D57 (D-loop), S93 (P-loop), and N128 (N-loop) form a hydrogen bonding network (DPN-triloop interaction) essential for catalytic activity; alanine mutations or somatic mutations at these positions reduce catalytic efficiency (kcat/KM) by >100-fold.","method":"X-ray crystallography, NMR spectroscopy, site-directed alanine mutagenesis, kinetic enzyme assays (kcat/KM measurements)","journal":"International journal of molecular sciences","confidence":"High","confidence_rationale":"Tier 1 — crystal structure and NMR with functional mutagenesis and kinetic validation in a single study","pmids":["33053837"],"is_preprint":false},{"year":2022,"finding":"DUSP22 directly interacts with focal adhesion kinase (FAK) and dephosphorylates it at Tyr397 and Tyr576+Tyr577, inhibiting downstream ERK1/2 and NF-κB signaling to suppress NASH and HCC progression; both FAK binding and dephosphorylation are required for DUSP22's protective effects.","method":"Co-immunoprecipitation, in vitro dephosphorylation assays, hepatic-specific DUSP22 knockout and transgenic overexpression mouse models, AAV-mediated gene therapy, phosphorylation assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro enzymatic assay identifying specific phosphorylation sites, KO/transgenic mouse models, multiple orthogonal validations","pmids":["36209205"],"is_preprint":false},{"year":2024,"finding":"DUSP22 dephosphorylates UBR2 at specific serine residues, leading to ubiquitin-mediated UBR2 degradation; UBR2 in turn mediates Lys63-linked ubiquitination of Lck at Lys99 and Lys276, which is required for Lck Tyr394 phosphorylation and activation during TCR signaling. DUSP22 thus inhibits T-cell activation by destabilizing UBR2, a positive upstream regulator of Lck.","method":"Co-immunoprecipitation, single-cell RNA sequencing, ubiquitination assays (K63-linkage specific), phosphorylation assays, UBR2 knockout, mass spectrometry, human SLE patient samples","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including specific ubiquitin linkage mapping, site-specific phosphorylation, genetic KO validation, and human patient data","pmids":["38225265"],"is_preprint":false},{"year":2024,"finding":"DUSP22 inhibits lung tumorigenesis by dephosphorylating EGFR and suppressing downstream c-Met, ERK1/2, and PD-L1 signaling; DUSP22 deletion enhances EGFR-driven lung tumorigenesis and increases c-Met-dependent cancer cell migration.","method":"shRNA knockdown, exogenous DUSP22 expression, xenograft tumor models, EGFR phosphorylation assays, c-Met inhibitor rescue experiments, genetic deletion of DUSP22","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2-3 — KO/KD with defined pathway phenotype and inhibitor rescue, specific phosphorylation target identified, single lab","pmids":["38877005"],"is_preprint":false},{"year":2023,"finding":"DUSP22 directly interacts with AKT via its phosphatase domain and dephosphorylates AKT at Ser473 and Thr308, inhibiting AKT-driven proliferation and migration of non-small cell lung cancer cells; this effect requires DUSP22 phosphatase activity.","method":"Co-immunoprecipitation, in vitro kinase/phosphatase assays, AKT phosphorylation assays, cell viability and migration assays in A549 and H1299 cells","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and in vitro assay establishing direct interaction and dephosphorylation at specific residues, phosphatase-activity dependence shown, single lab","pmids":["37937915"],"is_preprint":false},{"year":2025,"finding":"DUSP22 is upregulated in sarcopenic muscle; targeting DUSP22 with knockdown or the small molecule BML-260 prevents muscle wasting by suppressing FOXO3a through downregulation of JNK, independently of Akt activation.","method":"DUSP22 knockdown in muscle cells, BML-260 pharmacological treatment, sarcopenia mouse models, JNK and FOXO3a phosphorylation assays, human skeletal muscle cell atrophy model","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined molecular pathway (DUSP22-JNK-FOXO3a), pharmacological validation, multiple model systems, single lab","pmids":["40263624"],"is_preprint":false},{"year":2026,"finding":"DUSP22 binds LGALS1 and dephosphorylates it at Ser8 and Thr58, leading to LGALS1 protein degradation and relief of LGALS1-mediated immunosuppression, thereby enhancing CD8+ T-cell infiltration into the tumor microenvironment.","method":"Genome-wide Sleeping Beauty transposon screen, mass spectrometry, Co-immunoprecipitation, phosphomimetic mutant experiments, flow cytometry, in vitro T-cell transendothelial migration assay, in vivo mouse models, bulk and single-cell RNA sequencing","journal":"Journal for immunotherapy of cancer","confidence":"High","confidence_rationale":"Tier 1-2 — unbiased screen plus multiple orthogonal validation methods including site-specific phosphomimetic mutants, in vitro and in vivo functional assays","pmids":["41611244"],"is_preprint":false},{"year":2026,"finding":"DUSP22 (JSP1) is essential for integrin activation and adhesion in neutrophils during LPS/TNF-α-induced vascular inflammation; JSP1-knockout neutrophils show reduced SYK and HCK phosphorylation, consistent with impaired integrin-SRC signaling.","method":"JSP1-knockout mouse model (local Shwartzman reaction), neutrophil depletion and adoptive transfer experiments, integrin activation assays, SYK and HCK phosphorylation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with specific cellular phenotype, adoptive transfer confirmation, pathway defined by specific phosphorylation markers","pmids":["41850398"],"is_preprint":false},{"year":2026,"finding":"DUSP22 directly interacts with JNK, inhibits JNK phosphorylation, promotes mitophagy flux, improves mitochondrial quality, and reduces mitochondrial disorder-related apoptosis in cardiomyocytes; cardiac-specific DUSP22 knockout exacerbates doxorubicin-induced cardiotoxicity.","method":"Cardiac-specific DUSP22 knockout and overexpression mouse models, Western blot, immunofluorescence, RT-qPCR, JNK phosphorylation assays, mitophagy flux assays","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"High","confidence_rationale":"Tier 2 — cardiac-specific KO and OE mouse models with defined molecular mechanism (DUSP22-JNK axis), multiple readouts","pmids":["41950821"],"is_preprint":false},{"year":2010,"finding":"NOTCH1 regulates DUSP22 expression by modulating promoter methylation through a nuclear complex controlling DNMT3A activity; NOTCH1 PEST domain mutations stabilize NOTCH1 signaling, leading to increased DUSP22 promoter methylation and silencing, which promotes CCL19-driven CLL cell chemotaxis.","method":"CRISPR/Cas9-generated cell line models, DNA methylation analysis, DNMT3A activity assays, chemotaxis assays, xenograft models","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR KO models with mechanistic follow-up linking NOTCH1 to DUSP22 methylation via DNMT3A, functional chemotaxis readout","pmids":["28017968"],"is_preprint":false},{"year":2017,"finding":"In mouse fibroblast NIH3T3 cells, exogenous Myc-tagged DUSP22 is diffusely distributed in the cytoplasm and partially colocalizes with the actin cytoskeleton.","method":"Immunofluorescence microscopy with anti-Myc and actin co-staining in NIH3T3 cells","journal":"Medical molecular morphology","confidence":"Low","confidence_rationale":"Tier 3 — single localization observation without functional consequence established","pmids":["29282540"],"is_preprint":false}],"current_model":"DUSP22 is a myristoylated dual-specificity phosphatase that acts as a negative regulator of T-cell activation by dephosphorylating Lck at Tyr394 (directly) and by dephosphorylating UBR2 (leading to UBR2 degradation and loss of Lck K63-ubiquitination), while also functioning as a positive regulator of JNK signaling through a scaffold mechanism involving ASK1-MKK7-JNK complexes; additionally, DUSP22 dephosphorylates and inactivates multiple other substrates including ERα (Ser118), EGFR, FAK (Tyr397/576/577), AKT (Ser473/Thr308), JNK, and LGALS1 (Ser8/Thr58), with its active site maintained by a conserved DPN-triloop hydrogen bonding network, and its membrane localization dependent on N-terminal myristoylation."},"narrative":{"teleology":[{"year":2001,"claim":"Identification of DUSP22 as a dual-specificity phosphatase that paradoxically activates JNK and dephosphorylates ERK2 established the enzyme as a MAP kinase regulator with context-dependent outputs on different MAPK branches.","evidence":"Transient cotransfection JNK activation assays in mammalian cells; in vitro ERK2 dephosphorylation and TCR-induced NFAT/AP-1 reporter suppression in Jurkat T cells","pmids":["11717427","11733513"],"confidence":"High","gaps":["Mechanism of JNK activation versus ERK inhibition by the same phosphatase was unresolved","No substrate specificity determinants identified","In vivo relevance not yet established"]},{"year":2002,"claim":"Demonstration that DUSP22 associates with JNK and MKK7 in vivo but not JNK in vitro, and that gene disruption abolishes cytokine-induced JNK activation, revealed an indirect scaffolding mechanism rather than direct JNK dephosphorylation for JNK activation.","evidence":"Co-immunoprecipitation of JNK and MKK7 with DUSP22 in HEK293T cells; targeted gene disruption in murine ES cells abolishing TNF-α/TGF-β-induced JNK activation","pmids":["12138158"],"confidence":"High","gaps":["Stoichiometry and structural basis of the scaffold complex unknown","How phosphatase activity and scaffold function are coordinated was unclear"]},{"year":2004,"claim":"Establishing that N-terminal myristoylation at Gly-2 is required for plasma membrane targeting resolved how DUSP22 gains access to membrane-proximal substrates.","evidence":"Myristoylation site mutagenesis and fluorescence microscopy in 293T and NIH-3T3 cells","pmids":["15138252"],"confidence":"High","gaps":["Whether membrane localization is required for all or only specific substrate interactions was untested","Dynamic regulation of DUSP22 membrane association not examined"]},{"year":2007,"claim":"Discovery that DUSP22 associates with ERα and dephosphorylates Ser118 to suppress ERα-dependent transcription expanded the substrate repertoire beyond MAPKs to nuclear hormone receptors.","evidence":"Reciprocal co-immunoprecipitation of endogenous proteins in T47D breast cancer cells; catalytic mutant and siRNA controls with ERα reporter assays","pmids":["17384676"],"confidence":"High","gaps":["How DUSP22 accesses nuclear ERα given its membrane localization was not addressed","Physiological consequences in mammary tissue unknown"]},{"year":2014,"claim":"Identification of Lck Tyr394 as a direct DUSP22 substrate, together with the spontaneous autoimmunity phenotype in knockout mice, established DUSP22 as a critical negative regulator of TCR-proximal signaling in vivo.","evidence":"In vitro Lck pTyr394 dephosphorylation assay; JKAP-knockout mouse with enhanced T-cell responses and spontaneous autoimmunity; adoptive transfer EAE model","pmids":["24714587"],"confidence":"High","gaps":["Whether Lck was the sole T-cell substrate was unknown","Mechanism linking DUSP22 loss to specific autoimmune disease subtypes not defined"]},{"year":2016,"claim":"Reconstitution of the ASK1–MKK7–JNK scaffold complex with phosphatase-dead DUSP22 mutants confirmed that the JNK-activating function is independent of catalytic activity, demonstrating a dual-function protein.","evidence":"Co-immunoprecipitation of ASK1, MKK7, JNK with WT and catalytically inactive DUSP22; biphasic dose-dependent JNK phosphorylation and apoptosis assays","pmids":["27711255"],"confidence":"Medium","gaps":["Single lab; independent replication needed","Structural basis for scaffold versus phosphatase substrate selection unknown","In vivo relevance of scaffold function not demonstrated with genetic tools"]},{"year":2019,"claim":"Showing DUSP22 dephosphorylates EGFR and AR extended its tumor-suppressive role to receptor tyrosine kinase and androgen receptor signaling in prostate cancer.","evidence":"Co-immunoprecipitation and phosphorylation assays with catalytic mutant controls in prostate cancer cell lines","pmids":["31693867"],"confidence":"Medium","gaps":["Single lab; specific EGFR phosphorylation sites not mapped","In vivo validation in prostate cancer models not provided"]},{"year":2020,"claim":"Crystal structure and NMR of DUSP22 defined the DPN-triloop hydrogen bonding network (D57–S93–N128) essential for catalysis, providing the structural basis for understanding how somatic mutations inactivate the enzyme.","evidence":"X-ray crystallography, NMR spectroscopy, alanine mutagenesis with kcat/KM measurements showing >100-fold reduction","pmids":["33053837"],"confidence":"High","gaps":["No substrate-bound co-crystal structure","How DPN-triloop perturbation affects scaffold function not tested"]},{"year":2022,"claim":"Demonstration that DUSP22 dephosphorylates FAK at Tyr397/576/577 to suppress ERK1/2 and NF-κB signaling in hepatic-specific KO and transgenic mice linked DUSP22 loss to NASH and HCC progression.","evidence":"In vitro FAK dephosphorylation assays, hepatic-specific DUSP22 KO and transgenic OE mouse models, AAV-mediated gene therapy","pmids":["36209205"],"confidence":"High","gaps":["Whether FAK is the sole hepatic substrate is unclear","Therapeutic window and long-term safety of AAV-mediated DUSP22 restoration not established"]},{"year":2023,"claim":"Direct dephosphorylation of AKT at Ser473 and Thr308 by DUSP22 added PI3K-AKT to the list of pathways negatively regulated by DUSP22 in lung cancer cells.","evidence":"Co-immunoprecipitation and in vitro phosphatase assays in A549 and H1299 NSCLC cells with phosphatase-activity-dependent controls","pmids":["37937915"],"confidence":"Medium","gaps":["Single lab; independent confirmation needed","In vivo lung cancer models not included"]},{"year":2024,"claim":"Uncovering DUSP22's dephosphorylation of UBR2, leading to its degradation and loss of Lck K63-ubiquitination, revealed a second, indirect mechanism by which DUSP22 suppresses T-cell activation and linked DUSP22 deficiency to systemic lupus erythematosus.","evidence":"UBR2 KO, K63-linkage-specific ubiquitination assays, mass spectrometry for UBR2 phosphorylation sites, single-cell RNA-seq, human SLE patient samples","pmids":["38225265"],"confidence":"High","gaps":["Specific UBR2 serine residues dephosphorylated by DUSP22 identified but whether all are equally important is unclear","Causal role in human SLE beyond correlation not established"]},{"year":2025,"claim":"Finding that DUSP22 upregulation in sarcopenic muscle drives JNK-FOXO3a-dependent atrophy, inhibitable by BML-260, revealed a pathogenic gain-of-function context for DUSP22's JNK-regulatory role.","evidence":"DUSP22 knockdown in muscle cells, BML-260 pharmacological treatment, sarcopenia mouse models, JNK and FOXO3a phosphorylation assays","pmids":["40263624"],"confidence":"Medium","gaps":["Whether DUSP22 activates or inhibits JNK in muscle (conflicting with scaffold activation model) needs clarification","BML-260 selectivity for DUSP22 not fully characterized"]},{"year":2026,"claim":"Identification of LGALS1 as a DUSP22 substrate (dephosphorylation at Ser8/Thr58 triggers LGALS1 degradation) established a mechanism by which DUSP22 relieves immunosuppression and promotes CD8+ T-cell tumor infiltration.","evidence":"Genome-wide Sleeping Beauty transposon screen, mass spectrometry, phosphomimetic mutants, in vivo mouse tumor models, single-cell RNA-seq","pmids":["41611244"],"confidence":"High","gaps":["Whether DUSP22 regulation of LGALS1 operates in all tumor types or is context-specific","Direct structural basis for DUSP22–LGALS1 interaction not resolved"]},{"year":2026,"claim":"DUSP22 was shown to be essential for integrin activation and SYK/HCK phosphorylation in neutrophils during vascular inflammation, revealing a cell-type-specific positive signaling role distinct from its T-cell inhibitory function.","evidence":"JSP1-knockout mouse Shwartzman reaction model, neutrophil adoptive transfer, integrin activation and SYK/HCK phosphorylation assays","pmids":["41850398"],"confidence":"High","gaps":["Direct substrate in integrin signaling not identified","How DUSP22 promotes rather than inhibits SRC-family kinase signaling in neutrophils is mechanistically unresolved"]},{"year":2026,"claim":"Cardiac-specific DUSP22 knockout exacerbating doxorubicin cardiotoxicity through JNK-dependent mitophagy failure demonstrated tissue-specific protective roles via the DUSP22–JNK axis.","evidence":"Cardiac-specific DUSP22 KO and OE mouse models, JNK phosphorylation assays, mitophagy flux assays","pmids":["41950821"],"confidence":"High","gaps":["Whether DUSP22 directly dephosphorylates JNK or acts through scaffold disassembly in cardiomyocytes is unclear","Mitophagy receptor target of DUSP22-JNK regulation not identified"]},{"year":null,"claim":"Key unresolved questions include how DUSP22 switches between phosphatase and scaffold modes in different cell types, the structural basis for its remarkably broad substrate recognition, and whether its positive role in neutrophil integrin signaling involves direct or indirect phosphatase activity.","evidence":"","pmids":[],"confidence":"Low","gaps":["No substrate-bound co-crystal structure to explain broad specificity","Cell-type-specific regulatory mechanisms (membrane targeting, post-translational modifications) controlling functional output are undefined","Relative physiological importance of scaffold versus phosphatase functions in vivo is not genetically dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,4,5,8,9,10,11,13,15]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,11,17]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[19]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,11,15,16]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[7,17]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[10,12,13]}],"complexes":["ASK1-MKK7-JNK scaffold complex"],"partners":["LCK","UBR2","JNK1","MKK7","ASK1","FAK","EGFR","LGALS1"],"other_free_text":[]},"mechanistic_narrative":"DUSP22 is a myristoylated dual-specificity phosphatase that functions as a broad negative regulator of receptor-proximal signaling by directly dephosphorylating multiple kinases and signaling proteins, while also serving a phosphatase-independent scaffold role in JNK activation. In T cells, DUSP22 suppresses TCR signaling through two convergent mechanisms: direct dephosphorylation of Lck at Tyr394 and dephosphorylation of the E3 ligase UBR2, which triggers UBR2 degradation and loss of Lck K63-ubiquitination required for Lck activation; accordingly, DUSP22-knockout mice develop spontaneous autoimmunity [PMID:24714587, PMID:38225265]. Beyond T-cell regulation, DUSP22 dephosphorylates FAK (Tyr397/576/577), EGFR, AKT (Ser473/Thr308), ERα (Ser118), and LGALS1 (Ser8/Thr58), thereby suppressing downstream ERK, NF-κB, and PI3K-AKT pathways in contexts including hepatocellular carcinoma, lung cancer, and tumor immune evasion [PMID:36209205, PMID:38877005, PMID:37937915, PMID:17384676, PMID:41611244]. Independently of its phosphatase activity, DUSP22 scaffolds an ASK1–MKK7–JNK complex to promote JNK phosphorylation and apoptosis, and its catalytic mechanism depends on a structurally defined DPN-triloop hydrogen bonding network among residues D57, S93, and N128 [PMID:27711255, PMID:33053837]."},"prefetch_data":{"uniprot":{"accession":"Q9NRW4","full_name":"Dual specificity protein phosphatase 22","aliases":["JNK pathway associated phosphatase","JKAP","JNK-stimulatory phosphatase-1","JSP-1","Low molecular weight dual specificity phosphatase 2","LMW-DSP2","Mitogen-activated protein kinase phosphatase x","MAP kinase phosphatase x","MKP-x"],"length_aa":184,"mass_kda":20.9,"function":"Dual specificity phosphatase; can dephosphorylate both phosphotyrosine and phosphoserine or phosphothreonine residues (PubMed:24714587, PubMed:38225265). Activates the JNK signaling pathway (PubMed:11717427). Inhibits T-cell receptor signaling and T-cell mediated immune responses, acting, at least in part, by inducing degradation of E3 ubiquitin ligase UBR2 (PubMed:24714587, PubMed:38225265). Dephosphorylates and thereby induces 'Lys-48'-linked ubiquitination of UBR2, leading to proteasomal degradation of UBR2 (PubMed:38225265). Dephosphorylates and thereby inactivates tyrosine kinase LCK (PubMed:24714587). Inhibits UBR2-mediated 'Lys-63'-linked ubiquitination of LCK (PubMed:38225265). May play a role in B-cell receptor (BCR) signaling and B-cell function (By similarity)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9NRW4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DUSP22","classification":"Not Classified","n_dependent_lines":76,"n_total_lines":1208,"dependency_fraction":0.06291390728476821},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DUSP22","total_profiled":1310},"omim":[{"mim_id":"616778","title":"DUAL-SPECIFICITY PHOSPHATASE 22; DUSP22","url":"https://www.omim.org/entry/616778"},{"mim_id":"616776","title":"DUAL-SPECIFICITY PHOSPHATASE 15; DUSP15","url":"https://www.omim.org/entry/616776"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DUSP22"},"hgnc":{"alias_symbol":["MKPX","JSP1","JKAP","VHX"],"prev_symbol":[]},"alphafold":{"accession":"Q9NRW4","domains":[{"cath_id":"3.90.190.10","chopping":"5-181","consensus_level":"high","plddt":94.902,"start":5,"end":181}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NRW4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NRW4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NRW4-F1-predicted_aligned_error_v6.png","plddt_mean":93.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DUSP22","jax_strain_url":"https://www.jax.org/strain/search?query=DUSP22"},"sequence":{"accession":"Q9NRW4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NRW4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NRW4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NRW4"}},"corpus_meta":[{"pmid":"24714587","id":"PMC_24714587","title":"The phosphatase JKAP/DUSP22 inhibits T-cell receptor signalling and autoimmunity by inactivating Lck.","date":"2014","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/24714587","citation_count":120,"is_preprint":false},{"pmid":"30093402","id":"PMC_30093402","title":"Molecular profiling reveals immunogenic cues in anaplastic large cell lymphomas with DUSP22 rearrangements.","date":"2018","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/30093402","citation_count":101,"is_preprint":false},{"pmid":"15961311","id":"PMC_15961311","title":"Rhodanine derivatives as inhibitors of JSP-1.","date":"2005","source":"Bioorganic & medicinal chemistry letters","url":"https://pubmed.ncbi.nlm.nih.gov/15961311","citation_count":97,"is_preprint":false},{"pmid":"26379151","id":"PMC_26379151","title":"Morphologic Features of ALK-negative Anaplastic Large Cell Lymphomas With DUSP22 Rearrangements.","date":"2016","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/26379151","citation_count":93,"is_preprint":false},{"pmid":"24436131","id":"PMC_24436131","title":"Promoter hypermethylation of the phosphatase DUSP22 mediates PKA-dependent TAU phosphorylation and CREB activation in Alzheimer's disease.","date":"2014","source":"Hippocampus","url":"https://pubmed.ncbi.nlm.nih.gov/24436131","citation_count":89,"is_preprint":false},{"pmid":"12138158","id":"PMC_12138158","title":"The dual specificity JKAP specifically activates the c-Jun N-terminal kinase pathway.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12138158","citation_count":85,"is_preprint":false},{"pmid":"11717427","id":"PMC_11717427","title":"Activation of the Jnk signaling pathway by a dual-specificity phosphatase, JSP-1.","date":"2001","source":"Proceedings of the National Academy of Sciences of the United States of 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Targeted gene disruption abolished TNF-α- and TGF-β-induced JNK activation.\",\n      \"method\": \"Co-immunoprecipitation, overexpression and dominant-negative mutant (JKAP-C88S) in HEK293T cells, targeted gene disruption in murine ES cells, JNK activation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including KO, Co-IP, and overexpression with specific kinase readouts\",\n      \"pmids\": [\"12138158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"DUSP22 (VHX) dephosphorylates ERK2 in vitro and suppresses TCR-induced ERK2 activation and NFAT/AP-1 reporter activity (but not NF-κB) when expressed in Jurkat T cells.\",\n      \"method\": \"In vitro phosphatase assay with ERK2, cotransfection with NFAT/AP-1 and NF-κB luciferase reporters in Jurkat T cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro enzymatic assay plus functional reporter assay in T cells\",\n      \"pmids\": [\"11733513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"DUSP22 (VHX) is N-terminally myristoylated at Gly-2, and this myristoylation is required for its plasma membrane localization; mutation of the myristoylation site abrogates membrane targeting.\",\n      \"method\": \"Myristoylation site mutagenesis, subcellular localization by fluorescence microscopy in 293T and NIH-3T3 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct mutagenesis establishing causality between myristoylation and membrane localization\",\n      \"pmids\": [\"15138252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DUSP22 associates with estrogen receptor alpha (ERα) in vivo, dephosphorylates ERα at Ser-118, and suppresses ERα-mediated transcription; catalytically inactive DUSP22 mutants fail to suppress ERα activation.\",\n      \"method\": \"Co-immunoprecipitation in breast cancer cells (T47D), overexpression of WT and catalytic mutants, siRNA knockdown, ERα transcription reporter assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP of endogenous proteins, catalytic mutant controls, siRNA validation, specific phosphorylation site identified\",\n      \"pmids\": [\"17384676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DUSP22 (JKAP) directly inactivates Lck by dephosphorylating its activating Tyr-394 residue during TCR signaling, thereby suppressing T-cell activation; JKAP-knockout mice develop enhanced T-cell responses and spontaneous autoimmunity.\",\n      \"method\": \"JKAP-knockout mouse model, in vitro dephosphorylation assay of Lck pTyr394, T-cell proliferation and cytokine production assays, adoptive transfer EAE model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro enzymatic assay identifying specific phosphorylation site, KO mouse with defined phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"24714587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DUSP22 inhibits PKA activity and thereby regulates TAU phosphorylation status and CREB signaling in hippocampal neurons; DUSP22 promoter hypermethylation in Alzheimer's disease leads to its silencing and consequent PKA-dependent TAU hyperphosphorylation.\",\n      \"method\": \"DNA methylation profiling of human hippocampus, functional assays showing DUSP22 inhibition of PKA and effects on TAU phosphorylation and CREB activation\",\n      \"journal\": \"Hippocampus\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional assays linking DUSP22 to PKA/TAU/CREB pathway, but mechanistic detail of direct PKA dephosphorylation not fully reconstituted\",\n      \"pmids\": [\"24436131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DUSP22 acts as a scaffold protein for the ASK1-MKK7-JNK signaling complex, selectively associating with ASK1, MKK7, and JNK1/2; this scaffold function increases JNK phosphorylation and apoptosis in a concentration-dependent biphasic manner independently of DUSP22 phosphatase activity.\",\n      \"method\": \"Co-immunoprecipitation of ASK1, MKK7, and JNK with DUSP22; phosphatase-dead DUSP22 mutant overexpression; concentration-dependent JNK phosphorylation and apoptosis assays in mammalian cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP and phosphatase-dead mutant experiments, biphasic dose-response consistent with scaffold function, single lab\",\n      \"pmids\": [\"27711255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DUSP22 interacts with EGFR and dephosphorylates it, suppressing ERK1/2 signaling; DUSP22 also interacts with androgen receptor (AR) and inhibits EGF-induced AR phosphorylation at Tyr534, suppressing prostate-specific antigen expression in prostate cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, overexpression of DUSP22 and catalytic mutants in prostate cancer cell lines, ERK1/2 and AR phosphorylation assays, colony formation assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP identifying binding partners and specific phosphorylation sites, catalytic mutant controls, single lab\",\n      \"pmids\": [\"31693867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Crystal structure and NMR analysis of DUSP22 active site revealed that conserved residues D57 (D-loop), S93 (P-loop), and N128 (N-loop) form a hydrogen bonding network (DPN-triloop interaction) essential for catalytic activity; alanine mutations or somatic mutations at these positions reduce catalytic efficiency (kcat/KM) by >100-fold.\",\n      \"method\": \"X-ray crystallography, NMR spectroscopy, site-directed alanine mutagenesis, kinetic enzyme assays (kcat/KM measurements)\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure and NMR with functional mutagenesis and kinetic validation in a single study\",\n      \"pmids\": [\"33053837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DUSP22 directly interacts with focal adhesion kinase (FAK) and dephosphorylates it at Tyr397 and Tyr576+Tyr577, inhibiting downstream ERK1/2 and NF-κB signaling to suppress NASH and HCC progression; both FAK binding and dephosphorylation are required for DUSP22's protective effects.\",\n      \"method\": \"Co-immunoprecipitation, in vitro dephosphorylation assays, hepatic-specific DUSP22 knockout and transgenic overexpression mouse models, AAV-mediated gene therapy, phosphorylation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro enzymatic assay identifying specific phosphorylation sites, KO/transgenic mouse models, multiple orthogonal validations\",\n      \"pmids\": [\"36209205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DUSP22 dephosphorylates UBR2 at specific serine residues, leading to ubiquitin-mediated UBR2 degradation; UBR2 in turn mediates Lys63-linked ubiquitination of Lck at Lys99 and Lys276, which is required for Lck Tyr394 phosphorylation and activation during TCR signaling. DUSP22 thus inhibits T-cell activation by destabilizing UBR2, a positive upstream regulator of Lck.\",\n      \"method\": \"Co-immunoprecipitation, single-cell RNA sequencing, ubiquitination assays (K63-linkage specific), phosphorylation assays, UBR2 knockout, mass spectrometry, human SLE patient samples\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including specific ubiquitin linkage mapping, site-specific phosphorylation, genetic KO validation, and human patient data\",\n      \"pmids\": [\"38225265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DUSP22 inhibits lung tumorigenesis by dephosphorylating EGFR and suppressing downstream c-Met, ERK1/2, and PD-L1 signaling; DUSP22 deletion enhances EGFR-driven lung tumorigenesis and increases c-Met-dependent cancer cell migration.\",\n      \"method\": \"shRNA knockdown, exogenous DUSP22 expression, xenograft tumor models, EGFR phosphorylation assays, c-Met inhibitor rescue experiments, genetic deletion of DUSP22\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KO/KD with defined pathway phenotype and inhibitor rescue, specific phosphorylation target identified, single lab\",\n      \"pmids\": [\"38877005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DUSP22 directly interacts with AKT via its phosphatase domain and dephosphorylates AKT at Ser473 and Thr308, inhibiting AKT-driven proliferation and migration of non-small cell lung cancer cells; this effect requires DUSP22 phosphatase activity.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase/phosphatase assays, AKT phosphorylation assays, cell viability and migration assays in A549 and H1299 cells\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and in vitro assay establishing direct interaction and dephosphorylation at specific residues, phosphatase-activity dependence shown, single lab\",\n      \"pmids\": [\"37937915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DUSP22 is upregulated in sarcopenic muscle; targeting DUSP22 with knockdown or the small molecule BML-260 prevents muscle wasting by suppressing FOXO3a through downregulation of JNK, independently of Akt activation.\",\n      \"method\": \"DUSP22 knockdown in muscle cells, BML-260 pharmacological treatment, sarcopenia mouse models, JNK and FOXO3a phosphorylation assays, human skeletal muscle cell atrophy model\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined molecular pathway (DUSP22-JNK-FOXO3a), pharmacological validation, multiple model systems, single lab\",\n      \"pmids\": [\"40263624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"DUSP22 binds LGALS1 and dephosphorylates it at Ser8 and Thr58, leading to LGALS1 protein degradation and relief of LGALS1-mediated immunosuppression, thereby enhancing CD8+ T-cell infiltration into the tumor microenvironment.\",\n      \"method\": \"Genome-wide Sleeping Beauty transposon screen, mass spectrometry, Co-immunoprecipitation, phosphomimetic mutant experiments, flow cytometry, in vitro T-cell transendothelial migration assay, in vivo mouse models, bulk and single-cell RNA sequencing\",\n      \"journal\": \"Journal for immunotherapy of cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — unbiased screen plus multiple orthogonal validation methods including site-specific phosphomimetic mutants, in vitro and in vivo functional assays\",\n      \"pmids\": [\"41611244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"DUSP22 (JSP1) is essential for integrin activation and adhesion in neutrophils during LPS/TNF-α-induced vascular inflammation; JSP1-knockout neutrophils show reduced SYK and HCK phosphorylation, consistent with impaired integrin-SRC signaling.\",\n      \"method\": \"JSP1-knockout mouse model (local Shwartzman reaction), neutrophil depletion and adoptive transfer experiments, integrin activation assays, SYK and HCK phosphorylation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with specific cellular phenotype, adoptive transfer confirmation, pathway defined by specific phosphorylation markers\",\n      \"pmids\": [\"41850398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"DUSP22 directly interacts with JNK, inhibits JNK phosphorylation, promotes mitophagy flux, improves mitochondrial quality, and reduces mitochondrial disorder-related apoptosis in cardiomyocytes; cardiac-specific DUSP22 knockout exacerbates doxorubicin-induced cardiotoxicity.\",\n      \"method\": \"Cardiac-specific DUSP22 knockout and overexpression mouse models, Western blot, immunofluorescence, RT-qPCR, JNK phosphorylation assays, mitophagy flux assays\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cardiac-specific KO and OE mouse models with defined molecular mechanism (DUSP22-JNK axis), multiple readouts\",\n      \"pmids\": [\"41950821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NOTCH1 regulates DUSP22 expression by modulating promoter methylation through a nuclear complex controlling DNMT3A activity; NOTCH1 PEST domain mutations stabilize NOTCH1 signaling, leading to increased DUSP22 promoter methylation and silencing, which promotes CCL19-driven CLL cell chemotaxis.\",\n      \"method\": \"CRISPR/Cas9-generated cell line models, DNA methylation analysis, DNMT3A activity assays, chemotaxis assays, xenograft models\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO models with mechanistic follow-up linking NOTCH1 to DUSP22 methylation via DNMT3A, functional chemotaxis readout\",\n      \"pmids\": [\"28017968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In mouse fibroblast NIH3T3 cells, exogenous Myc-tagged DUSP22 is diffusely distributed in the cytoplasm and partially colocalizes with the actin cytoskeleton.\",\n      \"method\": \"Immunofluorescence microscopy with anti-Myc and actin co-staining in NIH3T3 cells\",\n      \"journal\": \"Medical molecular morphology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single localization observation without functional consequence established\",\n      \"pmids\": [\"29282540\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DUSP22 is a myristoylated dual-specificity phosphatase that acts as a negative regulator of T-cell activation by dephosphorylating Lck at Tyr394 (directly) and by dephosphorylating UBR2 (leading to UBR2 degradation and loss of Lck K63-ubiquitination), while also functioning as a positive regulator of JNK signaling through a scaffold mechanism involving ASK1-MKK7-JNK complexes; additionally, DUSP22 dephosphorylates and inactivates multiple other substrates including ERα (Ser118), EGFR, FAK (Tyr397/576/577), AKT (Ser473/Thr308), JNK, and LGALS1 (Ser8/Thr58), with its active site maintained by a conserved DPN-triloop hydrogen bonding network, and its membrane localization dependent on N-terminal myristoylation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DUSP22 is a myristoylated dual-specificity phosphatase that functions as a broad negative regulator of receptor-proximal signaling by directly dephosphorylating multiple kinases and signaling proteins, while also serving a phosphatase-independent scaffold role in JNK activation. In T cells, DUSP22 suppresses TCR signaling through two convergent mechanisms: direct dephosphorylation of Lck at Tyr394 and dephosphorylation of the E3 ligase UBR2, which triggers UBR2 degradation and loss of Lck K63-ubiquitination required for Lck activation; accordingly, DUSP22-knockout mice develop spontaneous autoimmunity [PMID:24714587, PMID:38225265]. Beyond T-cell regulation, DUSP22 dephosphorylates FAK (Tyr397/576/577), EGFR, AKT (Ser473/Thr308), ERα (Ser118), and LGALS1 (Ser8/Thr58), thereby suppressing downstream ERK, NF-κB, and PI3K-AKT pathways in contexts including hepatocellular carcinoma, lung cancer, and tumor immune evasion [PMID:36209205, PMID:38877005, PMID:37937915, PMID:17384676, PMID:41611244]. Independently of its phosphatase activity, DUSP22 scaffolds an ASK1–MKK7–JNK complex to promote JNK phosphorylation and apoptosis, and its catalytic mechanism depends on a structurally defined DPN-triloop hydrogen bonding network among residues D57, S93, and N128 [PMID:27711255, PMID:33053837].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of DUSP22 as a dual-specificity phosphatase that paradoxically activates JNK and dephosphorylates ERK2 established the enzyme as a MAP kinase regulator with context-dependent outputs on different MAPK branches.\",\n      \"evidence\": \"Transient cotransfection JNK activation assays in mammalian cells; in vitro ERK2 dephosphorylation and TCR-induced NFAT/AP-1 reporter suppression in Jurkat T cells\",\n      \"pmids\": [\"11717427\", \"11733513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism of JNK activation versus ERK inhibition by the same phosphatase was unresolved\",\n        \"No substrate specificity determinants identified\",\n        \"In vivo relevance not yet established\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstration that DUSP22 associates with JNK and MKK7 in vivo but not JNK in vitro, and that gene disruption abolishes cytokine-induced JNK activation, revealed an indirect scaffolding mechanism rather than direct JNK dephosphorylation for JNK activation.\",\n      \"evidence\": \"Co-immunoprecipitation of JNK and MKK7 with DUSP22 in HEK293T cells; targeted gene disruption in murine ES cells abolishing TNF-α/TGF-β-induced JNK activation\",\n      \"pmids\": [\"12138158\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Stoichiometry and structural basis of the scaffold complex unknown\",\n        \"How phosphatase activity and scaffold function are coordinated was unclear\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing that N-terminal myristoylation at Gly-2 is required for plasma membrane targeting resolved how DUSP22 gains access to membrane-proximal substrates.\",\n      \"evidence\": \"Myristoylation site mutagenesis and fluorescence microscopy in 293T and NIH-3T3 cells\",\n      \"pmids\": [\"15138252\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether membrane localization is required for all or only specific substrate interactions was untested\",\n        \"Dynamic regulation of DUSP22 membrane association not examined\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery that DUSP22 associates with ERα and dephosphorylates Ser118 to suppress ERα-dependent transcription expanded the substrate repertoire beyond MAPKs to nuclear hormone receptors.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation of endogenous proteins in T47D breast cancer cells; catalytic mutant and siRNA controls with ERα reporter assays\",\n      \"pmids\": [\"17384676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How DUSP22 accesses nuclear ERα given its membrane localization was not addressed\",\n        \"Physiological consequences in mammary tissue unknown\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of Lck Tyr394 as a direct DUSP22 substrate, together with the spontaneous autoimmunity phenotype in knockout mice, established DUSP22 as a critical negative regulator of TCR-proximal signaling in vivo.\",\n      \"evidence\": \"In vitro Lck pTyr394 dephosphorylation assay; JKAP-knockout mouse with enhanced T-cell responses and spontaneous autoimmunity; adoptive transfer EAE model\",\n      \"pmids\": [\"24714587\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether Lck was the sole T-cell substrate was unknown\",\n        \"Mechanism linking DUSP22 loss to specific autoimmune disease subtypes not defined\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Reconstitution of the ASK1–MKK7–JNK scaffold complex with phosphatase-dead DUSP22 mutants confirmed that the JNK-activating function is independent of catalytic activity, demonstrating a dual-function protein.\",\n      \"evidence\": \"Co-immunoprecipitation of ASK1, MKK7, JNK with WT and catalytically inactive DUSP22; biphasic dose-dependent JNK phosphorylation and apoptosis assays\",\n      \"pmids\": [\"27711255\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab; independent replication needed\",\n        \"Structural basis for scaffold versus phosphatase substrate selection unknown\",\n        \"In vivo relevance of scaffold function not demonstrated with genetic tools\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showing DUSP22 dephosphorylates EGFR and AR extended its tumor-suppressive role to receptor tyrosine kinase and androgen receptor signaling in prostate cancer.\",\n      \"evidence\": \"Co-immunoprecipitation and phosphorylation assays with catalytic mutant controls in prostate cancer cell lines\",\n      \"pmids\": [\"31693867\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab; specific EGFR phosphorylation sites not mapped\",\n        \"In vivo validation in prostate cancer models not provided\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Crystal structure and NMR of DUSP22 defined the DPN-triloop hydrogen bonding network (D57–S93–N128) essential for catalysis, providing the structural basis for understanding how somatic mutations inactivate the enzyme.\",\n      \"evidence\": \"X-ray crystallography, NMR spectroscopy, alanine mutagenesis with kcat/KM measurements showing >100-fold reduction\",\n      \"pmids\": [\"33053837\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No substrate-bound co-crystal structure\",\n        \"How DPN-triloop perturbation affects scaffold function not tested\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstration that DUSP22 dephosphorylates FAK at Tyr397/576/577 to suppress ERK1/2 and NF-κB signaling in hepatic-specific KO and transgenic mice linked DUSP22 loss to NASH and HCC progression.\",\n      \"evidence\": \"In vitro FAK dephosphorylation assays, hepatic-specific DUSP22 KO and transgenic OE mouse models, AAV-mediated gene therapy\",\n      \"pmids\": [\"36209205\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether FAK is the sole hepatic substrate is unclear\",\n        \"Therapeutic window and long-term safety of AAV-mediated DUSP22 restoration not established\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Direct dephosphorylation of AKT at Ser473 and Thr308 by DUSP22 added PI3K-AKT to the list of pathways negatively regulated by DUSP22 in lung cancer cells.\",\n      \"evidence\": \"Co-immunoprecipitation and in vitro phosphatase assays in A549 and H1299 NSCLC cells with phosphatase-activity-dependent controls\",\n      \"pmids\": [\"37937915\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab; independent confirmation needed\",\n        \"In vivo lung cancer models not included\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Uncovering DUSP22's dephosphorylation of UBR2, leading to its degradation and loss of Lck K63-ubiquitination, revealed a second, indirect mechanism by which DUSP22 suppresses T-cell activation and linked DUSP22 deficiency to systemic lupus erythematosus.\",\n      \"evidence\": \"UBR2 KO, K63-linkage-specific ubiquitination assays, mass spectrometry for UBR2 phosphorylation sites, single-cell RNA-seq, human SLE patient samples\",\n      \"pmids\": [\"38225265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific UBR2 serine residues dephosphorylated by DUSP22 identified but whether all are equally important is unclear\",\n        \"Causal role in human SLE beyond correlation not established\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Finding that DUSP22 upregulation in sarcopenic muscle drives JNK-FOXO3a-dependent atrophy, inhibitable by BML-260, revealed a pathogenic gain-of-function context for DUSP22's JNK-regulatory role.\",\n      \"evidence\": \"DUSP22 knockdown in muscle cells, BML-260 pharmacological treatment, sarcopenia mouse models, JNK and FOXO3a phosphorylation assays\",\n      \"pmids\": [\"40263624\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether DUSP22 activates or inhibits JNK in muscle (conflicting with scaffold activation model) needs clarification\",\n        \"BML-260 selectivity for DUSP22 not fully characterized\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identification of LGALS1 as a DUSP22 substrate (dephosphorylation at Ser8/Thr58 triggers LGALS1 degradation) established a mechanism by which DUSP22 relieves immunosuppression and promotes CD8+ T-cell tumor infiltration.\",\n      \"evidence\": \"Genome-wide Sleeping Beauty transposon screen, mass spectrometry, phosphomimetic mutants, in vivo mouse tumor models, single-cell RNA-seq\",\n      \"pmids\": [\"41611244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether DUSP22 regulation of LGALS1 operates in all tumor types or is context-specific\",\n        \"Direct structural basis for DUSP22–LGALS1 interaction not resolved\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"DUSP22 was shown to be essential for integrin activation and SYK/HCK phosphorylation in neutrophils during vascular inflammation, revealing a cell-type-specific positive signaling role distinct from its T-cell inhibitory function.\",\n      \"evidence\": \"JSP1-knockout mouse Shwartzman reaction model, neutrophil adoptive transfer, integrin activation and SYK/HCK phosphorylation assays\",\n      \"pmids\": [\"41850398\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct substrate in integrin signaling not identified\",\n        \"How DUSP22 promotes rather than inhibits SRC-family kinase signaling in neutrophils is mechanistically unresolved\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Cardiac-specific DUSP22 knockout exacerbating doxorubicin cardiotoxicity through JNK-dependent mitophagy failure demonstrated tissue-specific protective roles via the DUSP22–JNK axis.\",\n      \"evidence\": \"Cardiac-specific DUSP22 KO and OE mouse models, JNK phosphorylation assays, mitophagy flux assays\",\n      \"pmids\": [\"41950821\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether DUSP22 directly dephosphorylates JNK or acts through scaffold disassembly in cardiomyocytes is unclear\",\n        \"Mitophagy receptor target of DUSP22-JNK regulation not identified\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include how DUSP22 switches between phosphatase and scaffold modes in different cell types, the structural basis for its remarkably broad substrate recognition, and whether its positive role in neutrophil integrin signaling involves direct or indirect phosphatase activity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No substrate-bound co-crystal structure to explain broad specificity\",\n        \"Cell-type-specific regulatory mechanisms (membrane targeting, post-translational modifications) controlling functional output are undefined\",\n        \"Relative physiological importance of scaffold versus phosphatase functions in vivo is not genetically dissected\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 4, 5, 8, 9, 10, 11, 13, 15]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 11, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [0, 1, 2, 5, 7, 8, 10, 11, 13, 17]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 11, 15, 16]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [7, 17]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [10, 12, 13]}\n    ],\n    \"complexes\": [\n      \"ASK1-MKK7-JNK scaffold complex\"\n    ],\n    \"partners\": [\n      \"LCK\",\n      \"UBR2\",\n      \"JNK1\",\n      \"MKK7\",\n      \"ASK1\",\n      \"FAK\",\n      \"EGFR\",\n      \"LGALS1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}