{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe Wiskott–Aldrich syndrome protein (WASp) is a central regulator of actin nucleation and cytoskeletal reorganization in hematopoietic cells. Upon engagement of receptors such as the T‐cell receptor, CD28, integrins, or natural killer (NK) cell activating receptors, WASp is recruited into multiprotein complexes that couple upstream signals to the Arp2/3 complex, thereby promoting rapid actin polymerization. WASp undergoes conformational changes, is regulated by binding to factors like Cdc42 and phosphatidylinositol 4,5‐bisphosphate, and is further modulated by phosphorylation and dimerization. These molecular events serve to fine‐tune its activity and integrate inputs from diverse signaling pathways to coordinate cell morphology and motility."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn various immune cell types, WASp orchestrates processes critical for immunologic functions. In T cells, it is required for efficient immunological synapse formation and T‐cell receptor downregulation, while in NK cells, WASp localizes to the activating synapse to facilitate cytotoxic granule delivery and cytokine production. Similarly, WASp regulates the formation of podosomes in macrophages and dendritic cells, supports phagocytic cup formation, and is essential for proper integrin clustering in neutrophils, thereby influencing adhesion and directed migration. Its deficiency or aberrant activation not only disrupts normal actin remodeling in lymphocytes but also perturbs cell polarity in B cells and myeloid progenitors, contributing to immune dysregulation, autoimmunity, and, in some cases, defective myelopoiesis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "35"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its cytoplasmic roles, emerging evidence indicates that WASp influences nuclear events and protein turnover that are critical for proper lymphocyte development and function. Nuclear WASp participates in transcriptional regulation by associating with histone methyltransferases to promote a permissive chromatin state at key TH1 cytokine genes, thereby modulating T‐helper cell lineage decisions and preventing pathogenic Th2 responses. Moreover, post‐translational modifications such as ubiquitylation and controlled proteolysis not only restrict the duration and spatial distribution of WASp activity but may also serve tumor‐suppressive functions in T cell lymphomagenesis. The occurrence of revertant mosaicism in lymphoid lineages underscores the selective advantage of restoring WASp function in vivo, while conserved motifs that mediate interactions with glycolytic enzymes point to non‐canonical roles in regulating actin dynamics."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "36", "end_ref": "43"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, insights into the genetic and proteomic variations of WASP have provided strong genotype–phenotype correlations that inform prognosis and therapy. Mutations that abrogate WASp expression are associated with severe clinical manifestations—including immunodeficiency, thrombocytopenia, and bleeding—as well as an increased propensity for infections, autoimmunity, and malignancy. In contrast, missense or activating mutations may result in milder phenotypes or distinct clinical syndromes such as isolated thrombocytopenia or congenital neutropenia. Such correlations, together with observations of in vivo reversion and the success of hematopoietic stem cell transplantation—and more recently gene therapy—underscore the importance of WASp in immune homeostasis and establish it as a critical target for therapeutic intervention."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "44", "end_ref": "46"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Yoji Sasahara, Rima Rachid, Michael J Byrne, et al. 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