{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPhospholipase Cγ2 (PLCG2) is a critical enzyme acting as a signaling hub downstream of diverse immune receptors. Upon receptor engagement in B cells, platelets, dendritic cells, and other hematopoietic lineages, PLCG2 is recruited and activated through tyrosine phosphorylation by kinases such as Bruton's tyrosine kinase, Lyn, and Syk. Its activation depends on specialized domains—including an autoinhibitory Src homology 2 region and a unique split pleckstrin homology module—that regulate its catalytic hydrolysis of phosphatidylinositol 4,5‐bisphosphate into second messengers (inositol 1,4,5‐trisphosphate and diacylglycerol) to trigger Ca²⁺ mobilization, cytoskeletal remodeling, and other downstream responses. In addition, PLCG2 interacts with adaptor proteins (e.g., BANK1) and small GTPases such as Rac, which further modulate its membrane translocation and activity, thereby integrating receptor signals into coordinated cellular responses."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAberrant regulation of PLCG2 is implicated in hematologic malignancies and dysregulated immune responses. Acquired and germline mutations in PLCG2 contribute to resistance in chronic lymphocytic leukemia—where mutant forms can bypass traditional upstream signaling (e.g., via BTK inhibition by ibrutinib)—and underlie syndromes marked by autoimmunity and immunodeficiency, such as PLCG2‐associated antibody deficiency and immune dysregulation (APLAID). Moreover, altered PLCG2 signaling has been linked to additional pathologies including atypical inflammatory disorders and even distinct tumor phenotypes, highlighting its pivotal role in both malignancy and immune homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "17", "end_ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the realm of neurodegeneration, genetic studies have identified a protective PLCG2 coding variant (p.Pro522Arg) associated with reduced Alzheimer’s disease risk and a slower rate of cognitive decline. This variant appears to enhance microglial functions—promoting efficient antigen presentation, optimized lipid metabolism, and recruitment of T cells—which collectively may help mitigate tau pathology and dampen deleterious neuroinflammatory responses. 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