{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRab27A is a small GTPase that orchestrates the docking, tethering, and fusion of secretory vesicles in many specialized cell types. In cytotoxic lymphocytes, platelets, neutrophils and endothelial cells, Rab27A controls the exocytosis of lytic granules, dense core granules and secretory organelles such as Weibel–Palade bodies. Its interaction with specific effectors—including melanophilin, Munc13‐4, and the synaptotagmin‐like proteins—not only governs the proper transport of melanosomes in melanocytes and the release of perforin‐containing granules in immune cells but also plays a key role in regulated secretion in platelets and in the formation of neutrophil extracellular traps. These discoveries, based on integrative studies of vesicle trafficking in health and disease, underscore Rab27A’s central function in regulated exocytosis and its contribution to immune regulation and host defense."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "21"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of cancer and metastasis, Rab27A has emerged as a crucial mediator of vesicle secretion that modulates the tumor microenvironment. Overexpression of Rab27A has been linked to enhanced exosome release that can promote invasion and metastasis in malignancies such as melanoma, breast, lung, bladder, pancreatic, colorectal, and ovarian cancers. In these systems, Rab27A-dependent exosome secretion influences critical processes by transferring tumor-suppressor microRNAs or by promoting the secretion of growth factors like insulin‐like growth factor–II, thereby affecting cell signaling pathways and epithelial–mesenchymal transition. Such observations suggest that dysregulated Rab27A activity is intimately associated with tumor aggressiveness and patient prognosis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "22", "end_ref": "34"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role in secretion, Rab27A function is intricately regulated by a network of effectors, regulators and microRNAs that ensure precise control over vesicular dynamics. Studies have identified specific GAPs (e.g., EPI64) and shared GEFs (such as Rab3GEP) that modulate Rab27A’s activation state. Moreover, mutations in Rab27A are linked to genetic disorders (for example, Griscelli syndrome and hemophagocytic lymphohistiocytosis) by impairing its ability to bind guanine nucleotides or interact with effectors like melanophilin, Munc13‐4, and Slp family proteins. In addition, Rab27A has been implicated in diverse processes such as viral envelopment in cytomegalovirus, sperm acrosome reaction, and the compensatory regulation of lysosomal trafficking in disorders like cystinosis and dysferlinopathy. Together, these findings highlight the multifaceted regulatory landscape that governs Rab27A function and its broad physiological and pathological impact."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "35", "end_ref": "42"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Molly Strom, Alistair N Hume, Abul K Tarafder, et al. 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