{"gene":"DUSP22","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2001,"finding":"DUSP22/JSP-1 (VHX) is a dual-specificity phosphatase that 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, identifying it as a negative regulator of TCR-triggered MAP kinase signaling.","method":"In vitro phosphatase assay with ERK2 substrate; transient transfection in Jurkat T cells with NFAT/AP-1 and NF-κB luciferase reporters; Western blot for ERK2 phosphorylation","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro phosphatase assay plus cell-based functional reporter assays, single lab, two orthogonal methods","pmids":["11733513"],"is_preprint":false},{"year":2001,"finding":"DUSP22/JSP-1 functions as a selective activator of JNK (not ERK or p38) in transient co-transfection assays in human cells, contrary to the expected MAPK-inactivating role of dual-specificity phosphatases.","method":"Transient co-transfection overexpression assays in human cells; MAPK activity measurements for JNK, ERK, and p38","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based overexpression with multiple MAPK readouts, single lab, replicated by independent group (PMID:12138158)","pmids":["11717427"],"is_preprint":false},{"year":2002,"finding":"Murine JKAP/DUSP22 specifically activates JNK but not p38 or ERK2 upon overexpression in HEK293T cells; a catalytically inactive mutant (C88S) blocks TNF-α-induced JNK activation. Targeted gene disruption in embryonic stem cells abolished JNK activation by TNF-α and TGF-β but not UV-C. JKAP associated with JNK and MKK7 (but not SEK1) in vivo (co-immunoprecipitation), but did not interact with JNK in vitro, indicating an indirect scaffolding mechanism.","method":"Overexpression in HEK293T cells; catalytic mutant (C88S) dominant-negative analysis; targeted gene disruption in murine ES cells; co-immunoprecipitation; in vitro binding assay","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (loss-of-function genetic knockout, dominant-negative mutagenesis, Co-IP, in vitro binding), replicated finding of JNK activation across two independent labs","pmids":["12138158"],"is_preprint":false},{"year":2005,"finding":"Rhodanine-based compounds are potent and selective inhibitors of JSP-1/DUSP22 phosphatase enzymatic activity, establishing DUSP22 as a druggable dual-specificity phosphatase.","method":"In vitro enzymatic inhibition assay with synthesized rhodanine derivatives against JSP-1 and other DSP family members","journal":"Bioorganic & Medicinal Chemistry Letters","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro enzymatic assay, single lab, single method","pmids":["15961311"],"is_preprint":false},{"year":2004,"finding":"DUSP22/VHX is N-terminally myristoylated at Gly-2, and this modification is required for its membrane localization; mutation of the myristoylation site Gly-2 abrogated plasma membrane targeting.","method":"Mutagenesis of Gly-2 myristoylation site; subcellular localization imaging in 293T and NIH-3T3 cells; biochemical confirmation of myristoylation","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct mutagenesis with localization readout, validated biochemically, single lab","pmids":["15138252"],"is_preprint":false},{"year":2007,"finding":"DUSP22 associates with estrogen receptor alpha (ERα) in vivo (co-immunoprecipitation in ERα-positive breast cancer T47D cells) and dephosphorylates ERα at Ser-118, thereby suppressing ERα-mediated transcription. Catalytically inactive DUSP22 mutants failed to suppress E2-induced ERα phosphorylation and transcription; siRNA knockdown of DUSP22 enhanced ERα-mediated gene expression.","method":"Co-immunoprecipitation of endogenous proteins; overexpression and siRNA knockdown; phospho-specific Western blot for ERα Ser-118; transcriptional reporter assays; catalytic mutant analysis","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — reciprocal co-IP of endogenous proteins, siRNA and overexpression with phospho-specific readout, catalytic mutant confirms mechanism-dependence, single lab","pmids":["17384676"],"is_preprint":false},{"year":2014,"finding":"JKAP/DUSP22 directly inactivates Lck by dephosphorylating its activating Tyr-394 residue during TCR signalling. JKAP-knockout T cells display enhanced proliferation and cytokine production. JKAP-knockout mice are more susceptible to EAE, and adoptive transfer of knockout T cells exacerbates EAE, establishing JKAP as a negative regulator of TCR signalling in vivo.","method":"JKAP-knockout mice; in vitro phosphatase assay (dephosphorylation of Lck pTyr394); adoptive transfer experiments; T cell proliferation and cytokine production assays; EAE model","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro phosphatase assay identifying direct substrate (Lck Tyr394), genetic knockout with defined cellular and in vivo phenotypes, adoptive transfer confirming T cell-intrinsic role; multiple orthogonal methods","pmids":["24714587"],"is_preprint":false},{"year":2014,"finding":"DUSP22 promoter hypermethylation in Alzheimer's disease hippocampus leads to reduced DUSP22 expression, which in turn increases PKA activity (since DUSP22 inhibits PKA), resulting in elevated TAU phosphorylation and altered CREB signaling.","method":"DNA methylation profiling of human hippocampus; functional assays demonstrating DUSP22 inhibition of PKA activity and effects on TAU phosphorylation and CREB signaling","journal":"Hippocampus","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional demonstration of DUSP22 inhibiting PKA with downstream TAU/CREB readouts, human tissue methylation data; single lab","pmids":["24436131"],"is_preprint":false},{"year":2016,"finding":"DUSP22 acts as a scaffold protein for the ASK1-MKK7-JNK signaling pathway independently of its phosphatase catalytic activity at low concentrations. DUSP22 selectively associates with ASK1, MKK7, and JNK1/2 (co-immunoprecipitation), and increases JNK phosphorylation and JNK-mediated apoptosis in a bell-shaped concentration-dependent manner characteristic of scaffold proteins, even when phosphatase activity is abolished.","method":"Co-immunoprecipitation of DUSP22 with ASK1, MKK7, JNK1/2; overexpression at varying concentrations; phosphatase-dead mutant analysis; apoptosis assays","journal":"PloS One","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of multiple partners, phosphatase-dead mutant distinguishes scaffold from catalytic function, single lab with multiple orthogonal approaches","pmids":["27711255"],"is_preprint":false},{"year":2016,"finding":"Restoring DUSP22 expression in DUSP22-deficient malignant T cells inhibits cellular expansion by stimulating apoptosis and impairs soft agar clonogenicity and tumorigenicity, establishing DUSP22 as a tumor suppressor in peripheral T-cell lymphoma.","method":"Lentiviral re-expression of DUSP22 in DUSP22-deficient T-cell lymphoma cells; apoptosis assays; soft agar clonogenicity assay; xenograft tumorigenicity assay","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function rescue with multiple cellular phenotypic readouts including in vivo tumorigenicity, single lab","pmids":["27626696"],"is_preprint":false},{"year":2019,"finding":"DUSP22 directly dephosphorylates EGFR and suppresses downstream ERK1/2 signaling in prostate cancer cells. DUSP22 also physically interacts with androgen receptor (AR) and interferes with EGF-induced AR phosphorylation at Tyr534, suppressing AR-dependent signaling. A Ser58Ala mutation in DUSP22 (targeting an ERK1/2 phosphorylation site) was sufficient to suppress growth in cells with elevated p-ERK1/2, revealing a mutually antagonistic relationship between DUSP22 and ERK1/2.","method":"Exogenous DUSP22 expression in multiple prostate cancer cell lines; phospho-specific Western blot (EGFR, ERK1/2, AR Tyr534); co-immunoprecipitation of DUSP22 with AR; Ser58Ala mutagenesis; colony formation assays","journal":"FASEB Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, phospho-specific readouts, site-directed mutagenesis; single lab, multiple orthogonal methods","pmids":["31693867"],"is_preprint":false},{"year":2020,"finding":"DUSP22 active site formation requires a DPN-triloop hydrogen bonding network involving D57 (D-loop), S93 (P-loop), and N128 (N-loop). Alanine or somatic mutations of any of these residues reduce catalytic efficiency (kcat/KM) by >100-fold. NMR and crystal structures show each residue stabilizes correct positioning of the three loops for substrate interaction and catalysis.","method":"Crystal structure and NMR of DUSP22 mutants; site-directed alanine mutagenesis of D57, S93, N128; in vitro kinetic assay (kcat/KM measurement)","journal":"International Journal of Molecular Sciences","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus NMR structural validation plus in vitro kinetic assay with mutagenesis; comprehensive mechanistic characterization in single study","pmids":["33053837"],"is_preprint":false},{"year":2022,"finding":"Hepatocyte DUSP22 directly interacts with focal adhesion kinase (FAK) and dephosphorylates FAK at Tyr397 and Tyr576+577, subsequently inhibiting downstream ERK1/2 and NF-κB signaling to suppress NASH and HCC progression. Hepatic-specific DUSP22 deletion exacerbates lipid deposition, inflammation, and fibrosis; overexpression or AAV-mediated gene delivery inhibits NASH-related phenotypes.","method":"Hepatic-specific DUSP22 knockout and transgenic overexpression mice; AAV/lentivirus gene therapy; co-immunoprecipitation of DUSP22 with FAK; phospho-specific Western blot (FAK Tyr397, Tyr576+577); ERK1/2 and NF-κB activity assays; NASH/HCC models","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vivo genetic models (KO and OE), direct substrate identification with phospho-specific readout, Co-IP, multiple orthogonal methods, single lab but comprehensive","pmids":["36209205"],"is_preprint":false},{"year":2024,"finding":"DUSP22 dephosphorylates the E3 ubiquitin ligase UBR2 at specific serine residues, targeting it for ubiquitin-mediated degradation. UBR2 in turn induces Lys63-linked ubiquitination of Lck at Lys99 and Lys276, promoting subsequent Lck Tyr394 phosphorylation and activation downstream of TCR signalling. Inflammatory phenotypes from TCR-triggered Lck activation or DUSP22 knockout are attenuated by UBR2 genomic deletion, establishing UBR2 as a positive upstream regulator of Lck that is negatively controlled by DUSP22.","method":"Co-immunoprecipitation; single-cell RNA sequencing; UBR2 loss-of-function (KO); site-specific ubiquitination assays (K63-linkage at Lys99, Lys276 of Lck); phospho-specific Western blot (Lck Tyr394); epistasis by double knockout (DUSP22 KO + UBR2 KO); analysis of human SLE patient T cells","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods including epistasis genetics, site-specific ubiquitination mapping, Co-IP, phospho-specific readouts, human patient validation; single lab but comprehensive mechanistic dissection","pmids":["38225265"],"is_preprint":false},{"year":2023,"finding":"DUSP22 directly interacts with AKT via its phosphatase domain and dephosphorylates AKT at Ser473 and Thr308, inhibiting AKT-dependent proliferation and migration of NSCLC cells. This inhibitory effect is contingent upon DUSP22 phosphatase activity.","method":"Co-immunoprecipitation; in vitro kinase/phosphatase assays; phospho-specific Western blot (AKT Ser473, Thr308); DUSP22 overexpression in A549 and H1299 cells; cell viability and migration assays","journal":"Molecular Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — Co-IP plus in vitro phosphatase assay with phospho-specific readouts, single lab, two orthogonal methods","pmids":["37937915"],"is_preprint":false},{"year":2024,"finding":"DUSP22 dephosphorylates EGFR and suppresses c-Met signaling in lung cancer cells; DUSP22 loss enhances EGFR/c-Met and PD-L1-dependent migration. Gefitinib (EGFR inhibitor) suppresses migration induced by DUSP22 deletion and inhibits c-Met activity; cabozantinib (c-Met inhibitor) reduces migration and attenuates EGFR activation from DUSP22 loss.","method":"Exogenous DUSP22 expression; shRNA knockdown; genetic DUSP22 deletion; phospho-specific Western blot (EGFR, ERK1/2, c-Met); colony formation and migration assays; xenograft tumor growth","journal":"Cell Death Discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO and overexpression with phospho-specific readouts, pharmacological inhibitor epistasis, single lab","pmids":["38877005"],"is_preprint":false},{"year":2024,"finding":"DUSP22 binds to Galectin-1 (LGALS1) and dephosphorylates it at Ser8 and Thr58, leading to LGALS1 degradation and relief of LGALS1-mediated immunosuppression in the tumor microenvironment, resulting in increased CD8+ T cell infiltration and enhanced antitumor immunity.","method":"Genome-wide Sleeping Beauty transposon screen; mass spectrometry identification of DUSP22-LGALS1 interaction; co-immunoprecipitation validation; phosphomimetic mutant experiments for Ser8/Thr58; flow cytometry and IHC for CD8+ T cell infiltration; in vitro T cell transendothelial migration assay; in vivo mouse tumor models","journal":"Journal for Immunotherapy of Cancer","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — unbiased genetic screen, MS-identified interaction validated by Co-IP, phosphomimetic mutagenesis confirming specific dephosphorylation sites, multiple in vivo and in vitro readouts","pmids":["41611244"],"is_preprint":false},{"year":2025,"finding":"In skeletal muscle, DUSP22 is upregulated in sarcopenia and models of muscle wasting; DUSP22 knockdown or treatment with BML-260 prevents muscle atrophy by suppressing FOXO3a via downregulation of JNK, independently of Akt activation. Targeting DUSP22 reduces JNK-mediated FOXO3a activation.","method":"DUSP22 knockdown in skeletal muscle cells; BML-260 pharmacological inhibition; JNK activity and FOXO3a phosphorylation Western blots; multiple muscle wasting model systems including human skeletal muscle cells","journal":"EMBO Molecular Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown and pharmacological inhibition with specific mechanistic readouts (JNK, FOXO3a), single lab, multiple model systems","pmids":["40263624"],"is_preprint":false},{"year":2026,"finding":"JSP1/DUSP22 is essential for neutrophil integrin activation and adhesion in vascular inflammation. JSP1-knockout mice show reduced LPS-TNFα-induced vascular hemorrhage; neutrophil depletion and adoptive transfer established that JSP1-expressing neutrophils mediate this injury. Reduced SYK and HCK phosphorylation in JSP1-knockout neutrophils is consistent with impaired integrin-SRC signaling.","method":"JSP1-knockout mouse model; local Shwartzman reaction (LPS-TNFα vascular injury); neutrophil depletion; adoptive transfer of JSP1-expressing neutrophils; phospho-SYK and phospho-HCK Western blot; integrin activation assays","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout, adoptive transfer epistasis, molecular readouts (pSYK, pHCK), multiple orthogonal in vivo methods; peer-reviewed publication (also as preprint PMID:40950139)","pmids":["41850398","40950139"],"is_preprint":false},{"year":2026,"finding":"DUSP22 directly interacts with JNK in cardiomyocytes and inhibits JNK phosphorylation. Cardiac-specific DUSP22 knockout exacerbates doxorubicin-induced cardiotoxicity and increases mortality; cardiac-specific overexpression is protective. Mechanistically, DUSP22 dephosphorylation of JNK promotes mitophagy flux, improves mitochondrial quality, and reduces mitochondria-dependent apoptosis.","method":"Cardiac-specific Dusp22 knockout and overexpression mice; doxorubicin cardiotoxicity model; Western blot for JNK phosphorylation; co-immunoprecipitation of DUSP22 with JNK; mitophagy assays; apoptosis assays; immunofluorescence","journal":"Biochimica et Biophysica Acta - Molecular Basis of Disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cardiac-specific in vivo KO and OE, Co-IP identifying direct interaction with JNK, phospho-specific readout, single lab","pmids":["41950821"],"is_preprint":false},{"year":2024,"finding":"DUSP22 ameliorates TGF-β-induced endothelial-to-mesenchymal transition (EndMT) in HUVECs; DUSP22 deficiency aggravates EndMT while overexpression ameliorates it, acting through Smad2/3 and MAPK signaling pathways.","method":"TGF-β-induced EndMT model in HUVECs; DUSP22 overexpression and knockdown; signaling pathway inhibitors; Western blot for EndMT markers and pathway activation","journal":"Cardiovascular Therapeutics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — overexpression/knockdown with pharmacological inhibitors, pathway placement via inhibitors only, single lab, abstract does not confirm direct substrate","pmids":["38495810"],"is_preprint":false},{"year":2017,"finding":"DUSP22 is expressed in mouse tissues with a tissue-dependent profile; in NIH3T3 fibroblasts, endogenous and Myc-tagged Dusp22 are diffusely distributed in the cytoplasm, and overexpressed Myc-Dusp22 partially co-localizes with the actin cytoskeleton.","method":"Specific anti-Dusp22 antibody generation; Western blotting of mouse tissues; immunofluorescence localization in NIH3T3 cells","journal":"Medical Molecular Morphology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization by immunofluorescence without functional consequence established, single lab, single method","pmids":["29282540"],"is_preprint":false}],"current_model":"DUSP22 is a myristoylated dual-specificity phosphatase that functions both catalytically (dephosphorylating substrates including Lck Tyr394, UBR2 serine residues, ERα Ser118, EGFR, FAK Tyr397/576/577, AKT Ser473/Thr308, JNK, and LGALS1 Ser8/Thr58) and as a scaffold protein (assembling ASK1-MKK7-JNK complexes independently of catalytic activity) to regulate T cell activation, JNK-dependent apoptosis, NASH-HCC progression, neutrophil integrin-SRC signaling, tumor suppression, and immune checkpoint biology; in T cells it suppresses TCR signalling by inactivating the Lck-UBR2 ubiquitination axis, and its loss promotes autoimmunity and lymphomagenesis."},"narrative":{"mechanistic_narrative":"DUSP22 is a myristoylated dual-specificity phosphatase that operates as both a catalytic enzyme and a non-catalytic scaffold to regulate MAP kinase signaling, T cell activation, and tumor suppression across multiple tissues [PMID:12138158, PMID:24714587, PMID:27711255]. Its phosphatase activity depends on a DPN-triloop hydrogen-bonding network (D57, S93, N128) that positions the active-site loops for catalysis, and N-terminal myristoylation at Gly-2 directs it to the plasma membrane [PMID:33053837, PMID:15138252]. Catalytically, DUSP22 directly dephosphorylates a range of substrates to restrain growth and inflammatory signaling: it inactivates Lck at the activating Tyr394 to suppress TCR signaling, dephosphorylates the E3 ligase UBR2 to block UBR2-driven K63-ubiquitination and activation of Lck, dephosphorylates ERα at Ser118, EGFR, FAK at Tyr397/576/577, and AKT at Ser473/Thr308, and removes phosphates from Galectin-1 (Ser8/Thr58) to drive its degradation and relieve tumor-microenvironment immunosuppression [PMID:24714587, PMID:38225265, PMID:17384676, PMID:36209205, PMID:37937915, PMID:41611244]. Independently of catalysis, DUSP22 acts as a scaffold assembling ASK1–MKK7–JNK complexes to promote JNK activation and JNK-dependent apoptosis in a concentration-dependent manner [PMID:27711255, PMID:12138158]. Through these activities DUSP22 functions as a negative regulator of TCR signaling whose loss promotes T cell hyperactivation and autoimmunity, as a tumor suppressor in peripheral T-cell lymphoma, and as a protective factor limiting NASH/HCC progression and doxorubicin cardiotoxicity [PMID:24714587, PMID:38225265, PMID:27626696, PMID:36209205, PMID:41950821].","teleology":[{"year":2001,"claim":"Established DUSP22 as a dual-specificity phosphatase and a negative regulator of TCR-triggered MAP kinase signaling, framing it as a potential brake on T cell activation.","evidence":"In vitro ERK2 dephosphorylation assay and NFAT/AP-1 reporter assays in Jurkat T cells","pmids":["11733513"],"confidence":"Medium","gaps":["Direct physiological substrate in T cells not yet identified","Mechanism of MAPK selectivity unresolved"]},{"year":2002,"claim":"Resolved the paradox of a phosphatase activating JNK by showing DUSP22 acts through an indirect scaffolding mechanism, associating with JNK and MKK7 in vivo but not binding JNK directly in vitro.","evidence":"Overexpression and C88S dominant-negative analysis in HEK293T, ES-cell gene disruption, Co-IP, and in vitro binding assays","pmids":["12138158"],"confidence":"High","gaps":["Stoichiometry and composition of the scaffold complex not defined","Whether scaffold and catalytic functions act on the same pathway in vivo unclear"]},{"year":2004,"claim":"Defined how DUSP22 reaches its site of action by establishing Gly-2 myristoylation as the determinant of plasma membrane localization.","evidence":"Gly-2 mutagenesis with subcellular localization imaging and biochemical confirmation of myristoylation in 293T/NIH-3T3 cells","pmids":["15138252"],"confidence":"Medium","gaps":["Functional consequence of membrane targeting for specific substrates not tested","Regulation of myristoylation not addressed"]},{"year":2007,"claim":"Demonstrated a catalytic substrate beyond MAPKs, linking DUSP22 to hormone signaling by showing it dephosphorylates ERα Ser118 to suppress estrogen-driven transcription.","evidence":"Reciprocal endogenous Co-IP, siRNA and overexpression, phospho-Ser118 Western blot, and catalytic-mutant reporter assays in T47D cells","pmids":["17384676"],"confidence":"High","gaps":["In vivo relevance to breast tissue not established","Whether ERα is a direct enzymatic substrate vs. complex effect not fully separated"]},{"year":2014,"claim":"Identified Lck Tyr394 as a direct substrate and established DUSP22 as a T cell-intrinsic negative regulator of TCR signaling with autoimmune consequences in vivo.","evidence":"JKAP-knockout mice, in vitro Lck pTyr394 dephosphorylation assay, T cell functional assays, adoptive transfer, and EAE model","pmids":["24714587"],"confidence":"High","gaps":["Membrane recruitment relative to Lck not mechanistically connected","Upstream regulators of DUSP22 in T cells unknown at this stage"]},{"year":2016,"claim":"Separated DUSP22's catalytic and scaffold functions by showing phosphatase-dead DUSP22 still assembles ASK1-MKK7-JNK complexes and drives JNK apoptosis in a bell-shaped, scaffold-characteristic manner; in parallel established DUSP22 as a tumor suppressor in T-cell lymphoma.","evidence":"Co-IP of ASK1/MKK7/JNK1/2, phosphatase-dead mutant titration and apoptosis assays; lentiviral re-expression rescue with clonogenicity and xenograft assays","pmids":["27711255","27626696"],"confidence":"Medium","gaps":["Concentration thresholds in vivo unknown","How scaffold pro-apoptotic role reconciles with TCR-suppressive role not integrated"]},{"year":2019,"claim":"Extended the catalytic repertoire to receptor tyrosine kinase signaling by showing DUSP22 dephosphorylates EGFR and antagonizes AR phosphorylation, with reciprocal ERK1/2 regulation in prostate cancer.","evidence":"Exogenous expression, phospho-specific Western blot (EGFR, ERK1/2, AR Tyr534), Co-IP with AR, and Ser58Ala mutagenesis with colony formation assays","pmids":["31693867"],"confidence":"Medium","gaps":["Whether AR is a direct substrate or indirect target unclear","In vivo prostate cancer relevance not tested"]},{"year":2020,"claim":"Provided the structural basis for catalysis, defining the DPN-triloop (D57, S93, N128) network required for active-site formation.","evidence":"Crystal structure and NMR of DUSP22 mutants with site-directed alanine mutagenesis and kcat/KM kinetics","pmids":["33053837"],"confidence":"High","gaps":["Substrate-bound structures not determined","Structural basis of substrate selectivity not resolved"]},{"year":2022,"claim":"Established DUSP22 as a protective factor in liver disease by identifying FAK (Tyr397, Tyr576/577) as a direct hepatocyte substrate controlling ERK1/2 and NF-κB to limit NASH-HCC progression.","evidence":"Hepatic-specific KO and transgenic OE mice, AAV gene delivery, Co-IP with FAK, and phospho-specific Western blots in NASH/HCC models","pmids":["36209205"],"confidence":"High","gaps":["Tissue specificity of FAK substrate preference vs. other tissues unclear","Translational dosing of AAV approach not defined"]},{"year":2023,"claim":"Added AKT (Ser473, Thr308) as a direct substrate, linking DUSP22 to PI3K-AKT-driven proliferation and migration in NSCLC.","evidence":"Co-IP, in vitro phosphatase assays, phospho-specific Western blots, and viability/migration assays in A549 and H1299 cells","pmids":["37937915"],"confidence":"Medium","gaps":["In vivo lung tumor validation limited","Relative contribution vs. EGFR pathway in same cells not dissected"]},{"year":2024,"claim":"Resolved the upstream control of Lck by showing DUSP22 dephosphorylates UBR2, triggering its degradation and thereby blocking UBR2-mediated K63-ubiquitination and activation of Lck — extending the TCR-suppressive mechanism to human SLE T cells.","evidence":"Co-IP, scRNA-seq, UBR2 KO, site-specific K63-ubiquitination mapping (Lck Lys99/Lys276), DUSP22/UBR2 double-knockout epistasis, and SLE patient T cell analysis","pmids":["38225265"],"confidence":"High","gaps":["Precise UBR2 serine sites and their structural context not fully mapped","Whether membrane localization gates UBR2 access not addressed"]},{"year":2024,"claim":"Connected DUSP22 to antitumor immunity by identifying Galectin-1 (Ser8/Thr58) as a substrate whose dephosphorylation and degradation relieves immunosuppression and boosts CD8+ T cell infiltration.","evidence":"Genome-wide Sleeping Beauty screen, MS-identified interaction validated by Co-IP, phosphomimetic mutagenesis, flow/IHC for CD8+ infiltration, and in vivo tumor models","pmids":["41611244"],"confidence":"High","gaps":["Degradation pathway downstream of dephosphorylation not detailed","Combination with checkpoint blockade not tested"]},{"year":2024,"claim":"Broadened the functional reach to lung cancer EGFR/c-Met and PD-L1 biology and to endothelial biology, showing DUSP22 loss enhances RTK-driven migration and aggravates TGF-β-induced EndMT.","evidence":"Genetic deletion/knockdown and overexpression with phospho-specific readouts and inhibitor epistasis (gefitinib, cabozantinib) in lung cancer; OE/KD with pathway inhibitors in HUVEC EndMT model","pmids":["38877005","38495810"],"confidence":"Medium","gaps":["EndMT placement relies on inhibitors without direct substrate (Low confidence)","Direct vs. indirect c-Met regulation not established"]},{"year":2025,"claim":"Implicated DUSP22 in tissue homeostasis beyond cancer/immunity, showing it drives muscle atrophy via JNK-FOXO3a and is protective in cardiomyocytes by dephosphorylating JNK to promote mitophagy.","evidence":"DUSP22 knockdown and BML-260 inhibition with JNK/FOXO3a readouts in muscle wasting models; cardiac-specific KO/OE mice, Co-IP with JNK, mitophagy and apoptosis assays in doxorubicin cardiotoxicity","pmids":["40263624","41950821"],"confidence":"Medium","gaps":["Opposite directional effects on JNK across tissues not mechanistically reconciled","Whether catalytic or scaffold function dominates in each tissue unclear"]},{"year":2026,"claim":"Established a role in innate immunity by showing JSP1/DUSP22 is required for neutrophil integrin activation and vascular inflammatory injury, with reduced SYK/HCK phosphorylation in its absence.","evidence":"JSP1-knockout mice, Shwartzman vascular injury model, neutrophil depletion and adoptive transfer, and phospho-SYK/HCK Western blots","pmids":["41850398","40950139"],"confidence":"High","gaps":["Direct substrate in the integrin-SRC pathway not identified","Whether DUSP22 acts catalytically or as scaffold in neutrophils unknown"]},{"year":null,"claim":"How DUSP22 selects among its many catalytic substrates and toggles between catalytic and scaffold modes in a tissue- and context-specific manner remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No substrate-bound structure to explain selectivity","No unified model reconciling JNK-activating scaffold role with JNK-dephosphorylating catalytic role across tissues","Regulation of DUSP22 expression/localization upstream largely uncharacterized in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,5,6,10,12,13,14,16]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[3,11]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,13]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[21]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,6,12,14]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6,13,16,18]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[8,19]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[9,12]}],"complexes":["ASK1-MKK7-JNK signaling complex"],"partners":["MAPK8","MAP2K7","MAP3K5","LCK","UBR2","ESR1","PTK2","AKT1","EGFR","LGALS1"],"other_free_text":[]}},"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 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Targeted gene disruption in embryonic stem cells abolished JNK activation by TNF-α and TGF-β but not UV-C. JKAP associated with JNK and MKK7 (but not SEK1) in vivo (co-immunoprecipitation), but did not interact with JNK in vitro, indicating an indirect scaffolding mechanism.\",\n      \"method\": \"Overexpression in HEK293T cells; catalytic mutant (C88S) dominant-negative analysis; targeted gene disruption in murine ES cells; co-immunoprecipitation; in vitro binding assay\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (loss-of-function genetic knockout, dominant-negative mutagenesis, Co-IP, in vitro binding), replicated finding of JNK activation across two independent labs\",\n      \"pmids\": [\"12138158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Rhodanine-based compounds are potent and selective inhibitors of JSP-1/DUSP22 phosphatase enzymatic activity, establishing DUSP22 as a druggable dual-specificity phosphatase.\",\n      \"method\": \"In vitro enzymatic inhibition assay with synthesized rhodanine derivatives against JSP-1 and other DSP family members\",\n      \"journal\": \"Bioorganic & Medicinal Chemistry Letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro enzymatic assay, single lab, single method\",\n      \"pmids\": [\"15961311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"DUSP22/VHX is N-terminally myristoylated at Gly-2, and this modification is required for its membrane localization; mutation of the myristoylation site Gly-2 abrogated plasma membrane targeting.\",\n      \"method\": \"Mutagenesis of Gly-2 myristoylation site; subcellular localization imaging in 293T and NIH-3T3 cells; biochemical confirmation of myristoylation\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct mutagenesis with localization readout, validated biochemically, single lab\",\n      \"pmids\": [\"15138252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DUSP22 associates with estrogen receptor alpha (ERα) in vivo (co-immunoprecipitation in ERα-positive breast cancer T47D cells) and dephosphorylates ERα at Ser-118, thereby suppressing ERα-mediated transcription. Catalytically inactive DUSP22 mutants failed to suppress E2-induced ERα phosphorylation and transcription; siRNA knockdown of DUSP22 enhanced ERα-mediated gene expression.\",\n      \"method\": \"Co-immunoprecipitation of endogenous proteins; overexpression and siRNA knockdown; phospho-specific Western blot for ERα Ser-118; transcriptional reporter assays; catalytic mutant analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — reciprocal co-IP of endogenous proteins, siRNA and overexpression with phospho-specific readout, catalytic mutant confirms mechanism-dependence, single lab\",\n      \"pmids\": [\"17384676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"JKAP/DUSP22 directly inactivates Lck by dephosphorylating its activating Tyr-394 residue during TCR signalling. JKAP-knockout T cells display enhanced proliferation and cytokine production. JKAP-knockout mice are more susceptible to EAE, and adoptive transfer of knockout T cells exacerbates EAE, establishing JKAP as a negative regulator of TCR signalling in vivo.\",\n      \"method\": \"JKAP-knockout mice; in vitro phosphatase assay (dephosphorylation of Lck pTyr394); adoptive transfer experiments; T cell proliferation and cytokine production assays; EAE model\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro phosphatase assay identifying direct substrate (Lck Tyr394), genetic knockout with defined cellular and in vivo phenotypes, adoptive transfer confirming T cell-intrinsic role; multiple orthogonal methods\",\n      \"pmids\": [\"24714587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DUSP22 promoter hypermethylation in Alzheimer's disease hippocampus leads to reduced DUSP22 expression, which in turn increases PKA activity (since DUSP22 inhibits PKA), resulting in elevated TAU phosphorylation and altered CREB signaling.\",\n      \"method\": \"DNA methylation profiling of human hippocampus; functional assays demonstrating DUSP22 inhibition of PKA activity and effects on TAU phosphorylation and CREB signaling\",\n      \"journal\": \"Hippocampus\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional demonstration of DUSP22 inhibiting PKA with downstream TAU/CREB readouts, human tissue methylation data; single lab\",\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 pathway independently of its phosphatase catalytic activity at low concentrations. DUSP22 selectively associates with ASK1, MKK7, and JNK1/2 (co-immunoprecipitation), and increases JNK phosphorylation and JNK-mediated apoptosis in a bell-shaped concentration-dependent manner characteristic of scaffold proteins, even when phosphatase activity is abolished.\",\n      \"method\": \"Co-immunoprecipitation of DUSP22 with ASK1, MKK7, JNK1/2; overexpression at varying concentrations; phosphatase-dead mutant analysis; apoptosis assays\",\n      \"journal\": \"PloS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of multiple partners, phosphatase-dead mutant distinguishes scaffold from catalytic function, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"27711255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Restoring DUSP22 expression in DUSP22-deficient malignant T cells inhibits cellular expansion by stimulating apoptosis and impairs soft agar clonogenicity and tumorigenicity, establishing DUSP22 as a tumor suppressor in peripheral T-cell lymphoma.\",\n      \"method\": \"Lentiviral re-expression of DUSP22 in DUSP22-deficient T-cell lymphoma cells; apoptosis assays; soft agar clonogenicity assay; xenograft tumorigenicity assay\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function rescue with multiple cellular phenotypic readouts including in vivo tumorigenicity, single lab\",\n      \"pmids\": [\"27626696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DUSP22 directly dephosphorylates EGFR and suppresses downstream ERK1/2 signaling in prostate cancer cells. DUSP22 also physically interacts with androgen receptor (AR) and interferes with EGF-induced AR phosphorylation at Tyr534, suppressing AR-dependent signaling. A Ser58Ala mutation in DUSP22 (targeting an ERK1/2 phosphorylation site) was sufficient to suppress growth in cells with elevated p-ERK1/2, revealing a mutually antagonistic relationship between DUSP22 and ERK1/2.\",\n      \"method\": \"Exogenous DUSP22 expression in multiple prostate cancer cell lines; phospho-specific Western blot (EGFR, ERK1/2, AR Tyr534); co-immunoprecipitation of DUSP22 with AR; Ser58Ala mutagenesis; colony formation assays\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, phospho-specific readouts, site-directed mutagenesis; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"31693867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DUSP22 active site formation requires a DPN-triloop hydrogen bonding network involving D57 (D-loop), S93 (P-loop), and N128 (N-loop). Alanine or somatic mutations of any of these residues reduce catalytic efficiency (kcat/KM) by >100-fold. NMR and crystal structures show each residue stabilizes correct positioning of the three loops for substrate interaction and catalysis.\",\n      \"method\": \"Crystal structure and NMR of DUSP22 mutants; site-directed alanine mutagenesis of D57, S93, N128; in vitro kinetic assay (kcat/KM measurement)\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus NMR structural validation plus in vitro kinetic assay with mutagenesis; comprehensive mechanistic characterization in single study\",\n      \"pmids\": [\"33053837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Hepatocyte DUSP22 directly interacts with focal adhesion kinase (FAK) and dephosphorylates FAK at Tyr397 and Tyr576+577, subsequently inhibiting downstream ERK1/2 and NF-κB signaling to suppress NASH and HCC progression. Hepatic-specific DUSP22 deletion exacerbates lipid deposition, inflammation, and fibrosis; overexpression or AAV-mediated gene delivery inhibits NASH-related phenotypes.\",\n      \"method\": \"Hepatic-specific DUSP22 knockout and transgenic overexpression mice; AAV/lentivirus gene therapy; co-immunoprecipitation of DUSP22 with FAK; phospho-specific Western blot (FAK Tyr397, Tyr576+577); ERK1/2 and NF-κB activity assays; NASH/HCC models\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vivo genetic models (KO and OE), direct substrate identification with phospho-specific readout, Co-IP, multiple orthogonal methods, single lab but comprehensive\",\n      \"pmids\": [\"36209205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DUSP22 dephosphorylates the E3 ubiquitin ligase UBR2 at specific serine residues, targeting it for ubiquitin-mediated degradation. UBR2 in turn induces Lys63-linked ubiquitination of Lck at Lys99 and Lys276, promoting subsequent Lck Tyr394 phosphorylation and activation downstream of TCR signalling. Inflammatory phenotypes from TCR-triggered Lck activation or DUSP22 knockout are attenuated by UBR2 genomic deletion, establishing UBR2 as a positive upstream regulator of Lck that is negatively controlled by DUSP22.\",\n      \"method\": \"Co-immunoprecipitation; single-cell RNA sequencing; UBR2 loss-of-function (KO); site-specific ubiquitination assays (K63-linkage at Lys99, Lys276 of Lck); phospho-specific Western blot (Lck Tyr394); epistasis by double knockout (DUSP22 KO + UBR2 KO); analysis of human SLE patient T cells\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods including epistasis genetics, site-specific ubiquitination mapping, Co-IP, phospho-specific readouts, human patient validation; single lab but comprehensive mechanistic dissection\",\n      \"pmids\": [\"38225265\"],\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-dependent proliferation and migration of NSCLC cells. This inhibitory effect is contingent upon DUSP22 phosphatase activity.\",\n      \"method\": \"Co-immunoprecipitation; in vitro kinase/phosphatase assays; phospho-specific Western blot (AKT Ser473, Thr308); DUSP22 overexpression in A549 and H1299 cells; cell viability and migration assays\",\n      \"journal\": \"Molecular Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — Co-IP plus in vitro phosphatase assay with phospho-specific readouts, single lab, two orthogonal methods\",\n      \"pmids\": [\"37937915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DUSP22 dephosphorylates EGFR and suppresses c-Met signaling in lung cancer cells; DUSP22 loss enhances EGFR/c-Met and PD-L1-dependent migration. Gefitinib (EGFR inhibitor) suppresses migration induced by DUSP22 deletion and inhibits c-Met activity; cabozantinib (c-Met inhibitor) reduces migration and attenuates EGFR activation from DUSP22 loss.\",\n      \"method\": \"Exogenous DUSP22 expression; shRNA knockdown; genetic DUSP22 deletion; phospho-specific Western blot (EGFR, ERK1/2, c-Met); colony formation and migration assays; xenograft tumor growth\",\n      \"journal\": \"Cell Death Discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO and overexpression with phospho-specific readouts, pharmacological inhibitor epistasis, single lab\",\n      \"pmids\": [\"38877005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DUSP22 binds to Galectin-1 (LGALS1) and dephosphorylates it at Ser8 and Thr58, leading to LGALS1 degradation and relief of LGALS1-mediated immunosuppression in the tumor microenvironment, resulting in increased CD8+ T cell infiltration and enhanced antitumor immunity.\",\n      \"method\": \"Genome-wide Sleeping Beauty transposon screen; mass spectrometry identification of DUSP22-LGALS1 interaction; co-immunoprecipitation validation; phosphomimetic mutant experiments for Ser8/Thr58; flow cytometry and IHC for CD8+ T cell infiltration; in vitro T cell transendothelial migration assay; in vivo mouse tumor models\",\n      \"journal\": \"Journal for Immunotherapy of Cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — unbiased genetic screen, MS-identified interaction validated by Co-IP, phosphomimetic mutagenesis confirming specific dephosphorylation sites, multiple in vivo and in vitro readouts\",\n      \"pmids\": [\"41611244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In skeletal muscle, DUSP22 is upregulated in sarcopenia and models of muscle wasting; DUSP22 knockdown or treatment with BML-260 prevents muscle atrophy by suppressing FOXO3a via downregulation of JNK, independently of Akt activation. Targeting DUSP22 reduces JNK-mediated FOXO3a activation.\",\n      \"method\": \"DUSP22 knockdown in skeletal muscle cells; BML-260 pharmacological inhibition; JNK activity and FOXO3a phosphorylation Western blots; multiple muscle wasting model systems including human skeletal muscle cells\",\n      \"journal\": \"EMBO Molecular Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown and pharmacological inhibition with specific mechanistic readouts (JNK, FOXO3a), single lab, multiple model systems\",\n      \"pmids\": [\"40263624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"JSP1/DUSP22 is essential for neutrophil integrin activation and adhesion in vascular inflammation. JSP1-knockout mice show reduced LPS-TNFα-induced vascular hemorrhage; neutrophil depletion and adoptive transfer established that JSP1-expressing neutrophils mediate this injury. Reduced SYK and HCK phosphorylation in JSP1-knockout neutrophils is consistent with impaired integrin-SRC signaling.\",\n      \"method\": \"JSP1-knockout mouse model; local Shwartzman reaction (LPS-TNFα vascular injury); neutrophil depletion; adoptive transfer of JSP1-expressing neutrophils; phospho-SYK and phospho-HCK Western blot; integrin activation assays\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout, adoptive transfer epistasis, molecular readouts (pSYK, pHCK), multiple orthogonal in vivo methods; peer-reviewed publication (also as preprint PMID:40950139)\",\n      \"pmids\": [\"41850398\", \"40950139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"DUSP22 directly interacts with JNK in cardiomyocytes and inhibits JNK phosphorylation. Cardiac-specific DUSP22 knockout exacerbates doxorubicin-induced cardiotoxicity and increases mortality; cardiac-specific overexpression is protective. Mechanistically, DUSP22 dephosphorylation of JNK promotes mitophagy flux, improves mitochondrial quality, and reduces mitochondria-dependent apoptosis.\",\n      \"method\": \"Cardiac-specific Dusp22 knockout and overexpression mice; doxorubicin cardiotoxicity model; Western blot for JNK phosphorylation; co-immunoprecipitation of DUSP22 with JNK; mitophagy assays; apoptosis assays; immunofluorescence\",\n      \"journal\": \"Biochimica et Biophysica Acta - Molecular Basis of Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cardiac-specific in vivo KO and OE, Co-IP identifying direct interaction with JNK, phospho-specific readout, single lab\",\n      \"pmids\": [\"41950821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DUSP22 ameliorates TGF-β-induced endothelial-to-mesenchymal transition (EndMT) in HUVECs; DUSP22 deficiency aggravates EndMT while overexpression ameliorates it, acting through Smad2/3 and MAPK signaling pathways.\",\n      \"method\": \"TGF-β-induced EndMT model in HUVECs; DUSP22 overexpression and knockdown; signaling pathway inhibitors; Western blot for EndMT markers and pathway activation\",\n      \"journal\": \"Cardiovascular Therapeutics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — overexpression/knockdown with pharmacological inhibitors, pathway placement via inhibitors only, single lab, abstract does not confirm direct substrate\",\n      \"pmids\": [\"38495810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DUSP22 is expressed in mouse tissues with a tissue-dependent profile; in NIH3T3 fibroblasts, endogenous and Myc-tagged Dusp22 are diffusely distributed in the cytoplasm, and overexpressed Myc-Dusp22 partially co-localizes with the actin cytoskeleton.\",\n      \"method\": \"Specific anti-Dusp22 antibody generation; Western blotting of mouse tissues; immunofluorescence localization in NIH3T3 cells\",\n      \"journal\": \"Medical Molecular Morphology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization by immunofluorescence without functional consequence established, single lab, single method\",\n      \"pmids\": [\"29282540\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DUSP22 is a myristoylated dual-specificity phosphatase that functions both catalytically (dephosphorylating substrates including Lck Tyr394, UBR2 serine residues, ERα Ser118, EGFR, FAK Tyr397/576/577, AKT Ser473/Thr308, JNK, and LGALS1 Ser8/Thr58) and as a scaffold protein (assembling ASK1-MKK7-JNK complexes independently of catalytic activity) to regulate T cell activation, JNK-dependent apoptosis, NASH-HCC progression, neutrophil integrin-SRC signaling, tumor suppression, and immune checkpoint biology; in T cells it suppresses TCR signalling by inactivating the Lck-UBR2 ubiquitination axis, and its loss promotes autoimmunity and lymphomagenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DUSP22 is a myristoylated dual-specificity phosphatase that operates as both a catalytic enzyme and a non-catalytic scaffold to regulate MAP kinase signaling, T cell activation, and tumor suppression across multiple tissues [#2, #6, #8]. Its phosphatase activity depends on a DPN-triloop hydrogen-bonding network (D57, S93, N128) that positions the active-site loops for catalysis, and N-terminal myristoylation at Gly-2 directs it to the plasma membrane [#11, #4]. Catalytically, DUSP22 directly dephosphorylates a range of substrates to restrain growth and inflammatory signaling: it inactivates Lck at the activating Tyr394 to suppress TCR signaling, dephosphorylates the E3 ligase UBR2 to block UBR2-driven K63-ubiquitination and activation of Lck, dephosphorylates ERα at Ser118, EGFR, FAK at Tyr397/576/577, and AKT at Ser473/Thr308, and removes phosphates from Galectin-1 (Ser8/Thr58) to drive its degradation and relieve tumor-microenvironment immunosuppression [#6, #13, #5, #12, #14, #16]. Independently of catalysis, DUSP22 acts as a scaffold assembling ASK1–MKK7–JNK complexes to promote JNK activation and JNK-dependent apoptosis in a concentration-dependent manner [#8, #2]. Through these activities DUSP22 functions as a negative regulator of TCR signaling whose loss promotes T cell hyperactivation and autoimmunity, as a tumor suppressor in peripheral T-cell lymphoma, and as a protective factor limiting NASH/HCC progression and doxorubicin cardiotoxicity [#6, #13, #9, #12, #19].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established DUSP22 as a dual-specificity phosphatase and a negative regulator of TCR-triggered MAP kinase signaling, framing it as a potential brake on T cell activation.\",\n      \"evidence\": \"In vitro ERK2 dephosphorylation assay and NFAT/AP-1 reporter assays in Jurkat T cells\",\n      \"pmids\": [\"11733513\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physiological substrate in T cells not yet identified\", \"Mechanism of MAPK selectivity unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Resolved the paradox of a phosphatase activating JNK by showing DUSP22 acts through an indirect scaffolding mechanism, associating with JNK and MKK7 in vivo but not binding JNK directly in vitro.\",\n      \"evidence\": \"Overexpression and C88S dominant-negative analysis in HEK293T, ES-cell gene disruption, Co-IP, and in vitro binding assays\",\n      \"pmids\": [\"12138158\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and composition of the scaffold complex not defined\", \"Whether scaffold and catalytic functions act on the same pathway in vivo unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined how DUSP22 reaches its site of action by establishing Gly-2 myristoylation as the determinant of plasma membrane localization.\",\n      \"evidence\": \"Gly-2 mutagenesis with subcellular localization imaging and biochemical confirmation of myristoylation in 293T/NIH-3T3 cells\",\n      \"pmids\": [\"15138252\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of membrane targeting for specific substrates not tested\", \"Regulation of myristoylation not addressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated a catalytic substrate beyond MAPKs, linking DUSP22 to hormone signaling by showing it dephosphorylates ERα Ser118 to suppress estrogen-driven transcription.\",\n      \"evidence\": \"Reciprocal endogenous Co-IP, siRNA and overexpression, phospho-Ser118 Western blot, and catalytic-mutant reporter assays in T47D cells\",\n      \"pmids\": [\"17384676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance to breast tissue not established\", \"Whether ERα is a direct enzymatic substrate vs. complex effect not fully separated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified Lck Tyr394 as a direct substrate and established DUSP22 as a T cell-intrinsic negative regulator of TCR signaling with autoimmune consequences in vivo.\",\n      \"evidence\": \"JKAP-knockout mice, in vitro Lck pTyr394 dephosphorylation assay, T cell functional assays, adoptive transfer, and EAE model\",\n      \"pmids\": [\"24714587\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Membrane recruitment relative to Lck not mechanistically connected\", \"Upstream regulators of DUSP22 in T cells unknown at this stage\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Separated DUSP22's catalytic and scaffold functions by showing phosphatase-dead DUSP22 still assembles ASK1-MKK7-JNK complexes and drives JNK apoptosis in a bell-shaped, scaffold-characteristic manner; in parallel established DUSP22 as a tumor suppressor in T-cell lymphoma.\",\n      \"evidence\": \"Co-IP of ASK1/MKK7/JNK1/2, phosphatase-dead mutant titration and apoptosis assays; lentiviral re-expression rescue with clonogenicity and xenograft assays\",\n      \"pmids\": [\"27711255\", \"27626696\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Concentration thresholds in vivo unknown\", \"How scaffold pro-apoptotic role reconciles with TCR-suppressive role not integrated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended the catalytic repertoire to receptor tyrosine kinase signaling by showing DUSP22 dephosphorylates EGFR and antagonizes AR phosphorylation, with reciprocal ERK1/2 regulation in prostate cancer.\",\n      \"evidence\": \"Exogenous expression, phospho-specific Western blot (EGFR, ERK1/2, AR Tyr534), Co-IP with AR, and Ser58Ala mutagenesis with colony formation assays\",\n      \"pmids\": [\"31693867\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether AR is a direct substrate or indirect target unclear\", \"In vivo prostate cancer relevance not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Provided the structural basis for catalysis, defining the DPN-triloop (D57, S93, N128) network required for active-site formation.\",\n      \"evidence\": \"Crystal structure and NMR of DUSP22 mutants with site-directed alanine mutagenesis and kcat/KM kinetics\",\n      \"pmids\": [\"33053837\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate-bound structures not determined\", \"Structural basis of substrate selectivity not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established DUSP22 as a protective factor in liver disease by identifying FAK (Tyr397, Tyr576/577) as a direct hepatocyte substrate controlling ERK1/2 and NF-κB to limit NASH-HCC progression.\",\n      \"evidence\": \"Hepatic-specific KO and transgenic OE mice, AAV gene delivery, Co-IP with FAK, and phospho-specific Western blots in NASH/HCC models\",\n      \"pmids\": [\"36209205\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue specificity of FAK substrate preference vs. other tissues unclear\", \"Translational dosing of AAV approach not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Added AKT (Ser473, Thr308) as a direct substrate, linking DUSP22 to PI3K-AKT-driven proliferation and migration in NSCLC.\",\n      \"evidence\": \"Co-IP, in vitro phosphatase assays, phospho-specific Western blots, and viability/migration assays in A549 and H1299 cells\",\n      \"pmids\": [\"37937915\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo lung tumor validation limited\", \"Relative contribution vs. EGFR pathway in same cells not dissected\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved the upstream control of Lck by showing DUSP22 dephosphorylates UBR2, triggering its degradation and thereby blocking UBR2-mediated K63-ubiquitination and activation of Lck — extending the TCR-suppressive mechanism to human SLE T cells.\",\n      \"evidence\": \"Co-IP, scRNA-seq, UBR2 KO, site-specific K63-ubiquitination mapping (Lck Lys99/Lys276), DUSP22/UBR2 double-knockout epistasis, and SLE patient T cell analysis\",\n      \"pmids\": [\"38225265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise UBR2 serine sites and their structural context not fully mapped\", \"Whether membrane localization gates UBR2 access not addressed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected DUSP22 to antitumor immunity by identifying Galectin-1 (Ser8/Thr58) as a substrate whose dephosphorylation and degradation relieves immunosuppression and boosts CD8+ T cell infiltration.\",\n      \"evidence\": \"Genome-wide Sleeping Beauty screen, MS-identified interaction validated by Co-IP, phosphomimetic mutagenesis, flow/IHC for CD8+ infiltration, and in vivo tumor models\",\n      \"pmids\": [\"41611244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Degradation pathway downstream of dephosphorylation not detailed\", \"Combination with checkpoint blockade not tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Broadened the functional reach to lung cancer EGFR/c-Met and PD-L1 biology and to endothelial biology, showing DUSP22 loss enhances RTK-driven migration and aggravates TGF-β-induced EndMT.\",\n      \"evidence\": \"Genetic deletion/knockdown and overexpression with phospho-specific readouts and inhibitor epistasis (gefitinib, cabozantinib) in lung cancer; OE/KD with pathway inhibitors in HUVEC EndMT model\",\n      \"pmids\": [\"38877005\", \"38495810\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"EndMT placement relies on inhibitors without direct substrate (Low confidence)\", \"Direct vs. indirect c-Met regulation not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated DUSP22 in tissue homeostasis beyond cancer/immunity, showing it drives muscle atrophy via JNK-FOXO3a and is protective in cardiomyocytes by dephosphorylating JNK to promote mitophagy.\",\n      \"evidence\": \"DUSP22 knockdown and BML-260 inhibition with JNK/FOXO3a readouts in muscle wasting models; cardiac-specific KO/OE mice, Co-IP with JNK, mitophagy and apoptosis assays in doxorubicin cardiotoxicity\",\n      \"pmids\": [\"40263624\", \"41950821\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Opposite directional effects on JNK across tissues not mechanistically reconciled\", \"Whether catalytic or scaffold function dominates in each tissue unclear\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Established a role in innate immunity by showing JSP1/DUSP22 is required for neutrophil integrin activation and vascular inflammatory injury, with reduced SYK/HCK phosphorylation in its absence.\",\n      \"evidence\": \"JSP1-knockout mice, Shwartzman vascular injury model, neutrophil depletion and adoptive transfer, and phospho-SYK/HCK Western blots\",\n      \"pmids\": [\"41850398\", \"40950139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct substrate in the integrin-SRC pathway not identified\", \"Whether DUSP22 acts catalytically or as scaffold in neutrophils unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DUSP22 selects among its many catalytic substrates and toggles between catalytic and scaffold modes in a tissue- and context-specific manner remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No substrate-bound structure to explain selectivity\", \"No unified model reconciling JNK-activating scaffold role with JNK-dephosphorylating catalytic role across tissues\", \"Regulation of DUSP22 expression/localization upstream largely uncharacterized in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 5, 6, 10, 12, 13, 14, 16]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [3, 11]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 6, 12, 14]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 13, 16, 18]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [8, 19]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [9, 12]}\n    ],\n    \"complexes\": [\"ASK1-MKK7-JNK signaling complex\"],\n    \"partners\": [\"MAPK8\", \"MAP2K7\", \"MAP3K5\", \"LCK\", \"UBR2\", \"ESR1\", \"PTK2\", \"AKT1\", \"EGFR\", \"LGALS1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}