{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPTPN22 encodes the lymphoid tyrosine phosphatase (Lyp), a hematopoietic‐specific enzyme that plays a pivotal role in maintaining immune homeostasis. Lyp functions as a negative regulator of T‐cell receptor (TCR) signaling by dephosphorylating key substrates such as Src family kinases and components of the TCR complex—including Lck, Zap70 and TCRζ—thereby setting the threshold for T‐cell activation. Functional studies indicate that the common autoimmune risk variant (R620W) enhances phosphatase activity, leading to diminished TCR signaling and lower interleukin-2 production upon stimulation. In addition, structural and biochemical analyses have revealed that post-translational modifications such as PKC-mediated phosphorylation (e.g., at Ser-35) can modulate Lyp’s conformation and substrate recognition, further fine-tuning T-cell responses."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond T cells, PTPN22 also exerts key regulatory effects on B lymphocytes. Studies in carriers of the risk variant demonstrate impaired B-cell receptor (BCR) signaling, a reduction in calcium mobilization and surface activation markers, and a defective elimination of autoreactive clones during B-cell maturation. Consequently, individuals harboring the variant exhibit disturbances in central and peripheral B-cell tolerance, including an expansion of transitional and anergic B-cell subsets. Moreover, alternate missense substitutions in the catalytic domain (such as R263Q) that diminish phosphatase activity confer protection against autoimmunity, underscoring the critical balance of Lyp activity required for proper immune tolerance."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMoreover, the contribution of PTPN22 to autoimmunity extends into its diverse genetic associations and interactions across multiple diseases. Numerous studies across rheumatoid arthritis, type 1 diabetes, systemic lupus erythematosus, Graves’ disease, Behçet’s disease, giant cell arteritis and hypothyroidism have established the PTPN22 risk allele as a shared determinant that alters immune signaling thresholds. The collective evidence suggests that in addition to its canonical role in dampening TCR and BCR activation, altered PTPN22 activity perturbs gene–gene interactions (e.g. with HLA alleles), influences the balance between effector and regulatory immune responses, and even modulates inflammasome activation via dephosphorylation of NLRP3 to affect IL-1β release. Ethnic differences in allele frequencies and the presence of additional PTPN22-containing haplotypes further contribute to the complex genetics underlying susceptibility to autoimmunity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ann B Begovich, Victoria E H Carlton, Lee A Honigberg, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Replication of an association between the lymphoid tyrosine phosphatase locus (LYP/PTPN22) with type 1 diabetes, and evidence for its role as a general autoimmunity locus."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Diabetes (2004)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.2337/diabetes.53.11.3020"}], "href": "https://doi.org/10.2337/diabetes.53.11.3020"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15504986"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15504986"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Weipeng Zheng, Jin-Xiong She "}, {"type": "b", "children": [{"type": "t", "text": "Genetic association between a lymphoid tyrosine phosphatase (PTPN22) and type 1 diabetes."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Diabetes (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.2337/diabetes.54.3.906"}], "href": "https://doi.org/10.2337/diabetes.54.3.906"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15734872"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15734872"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Torkel Vang, Mauro Congia, Maria Doloretta Macis, et al. 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