{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRAC2 is a key regulator of the actin cytoskeleton in hematopoietic cells, critically governing cell adhesion, polarization, and migration. In innate immune cells such as macrophages and neutrophils, RAC2 orchestrates podosome formation, membrane ruffling, and directed chemotaxis in response to diverse stimuli. It achieves this by engaging with specific guanine nucleotide exchange factors (e.g., P‐Rex1 and DOCK family proteins) and interacting with integrin‐mediated adhesion complexes, thereby coupling extracellular signals to actin remodeling and primary granule exocytosis. These dynamic cytoskeletal changes allow immune cells to efficiently migrate, form immunological synapses, and execute microbial killing."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRAC2 also functions centrally in the regulation of reactive oxygen species (ROS) production and mitochondrial signaling. Its activation is essential for the proper assembly and function of the NADPH oxidase complex in neutrophils and phagocytes, thereby driving the oxidative burst necessary for pathogen clearance. Moreover, aberrant RAC2 activity contributes to altered mitochondrial membrane potential and electron transport chain dysfunction, which can promote oxidative DNA damage and genomic instability in leukemia stem/progenitor cells. Deregulated RAC2 signaling is implicated in adaptive responses to environmental stress—including those triggered by toxins or therapeutic agents—and may underlie adverse outcomes such as anthracycline‐induced cardiotoxicity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "16", "end_ref": "30"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the realm of immunological regulation, RAC2 is indispensable for appropriate T cell activation and programmed cell death. It modulates restimulation‐induced cell death (RICD) by facilitating cytoskeletal rearrangements that promote the translocation of death receptors (such as Fas) into lipid microdomains, thereby sensitizing T cells to apoptotic signals. Additionally, RAC2 activation downstream of antigen receptor engagement via DOCK2 is critical for optimal interleukin‐2 promoter activity, contributing to balanced immune responses and maintaining peripheral tolerance. Disruption of these processes through RAC2 mutations can lead to immunodeficiency states."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "31", "end_ref": "35"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its functions in normal cellular physiology, deregulated RAC2 signaling plays a role in oncogenesis and developmental disorders. Activating mutations of RAC2 have been identified in various human cancers—including sarcomas, brain tumors, clear cell renal cell carcinoma, and osteosarcoma—and are associated with enhanced cell proliferation, invasion, and metastatic potential. Furthermore, aberrant RAC2‐mediated pathways have been implicated in neurodevelopmental anomalies and in modulating cellular responses to environmental stressors, suggesting that RAC2 may serve as both a biomarker and a therapeutic target in malignancies and congenital disorders."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "36", "end_ref": "41"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRAC2’s functions also extend to the regulation of hematopoietic differentiation and the maintenance of stem/progenitor cell integrity. Its signaling ensures proper cell survival and proliferation while safeguarding mitochondrial function in leukemia stem cells, thereby linking RAC2 activity to the overall fitness of the hematopoietic compartment and highlighting its potential as a target in hematologic malignancies."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "42"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ann P Wheeler, Claire M Wells, Stephen D Smith, et al. 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