{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPIKfyve is an evolutionarily conserved lipid kinase that phosphorylates phosphatidylinositol 3‐phosphate to generate phosphatidylinositol 3,5‐bisphosphate as well as phosphatidylinositol 5‐phosphate. These products serve as key signaling lipids required for the maintenance of endomembrane homeostasis. PIKfyve is predominantly localized to early endosomal membranes, where its activity regulates endosomal morphology and membrane retrieval, as evidenced by the appearance of swollen vacuoles upon its inhibition or inactivation. Its conserved function in yeast and metazoans underlines its fundamental role in controlling vesicular dynamics and ensuring proper endosomal compartmentalization."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role in establishing endosomal identity, PIKfyve orchestrates multiple trafficking events. It facilitates retrograde membrane transport from early endosomes to the trans-Golgi network and regulates the formation and maturation of multivesicular bodies, thereby impacting receptor sorting and degradation (e.g. EGFR and PDGFR). Moreover, its activity influences the secretion of exosomes and the engagement of secretory autophagy pathways, demonstrating a key role in modulating membrane cargo flow through the endocytic network."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to controlling vesicular morphology, PIKfyve is central to lysosomal dynamics and autophagic processes. Its inhibition leads to dramatic lysosome enlargement and disruption of fusion–fission balance, thereby impairing the degradation of activated receptors and autophagy flux. By supporting proper nutrient recovery from engulfed material and modulating signaling via ion channels and Rac-dependent migration, PIKfyve integrates trafficking with metabolic and stress‐related responses, highlighting its pleiotropic role in cell physiology."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "15", "end_ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nPIKfyve dysfunction or misregulation is implicated in a variety of human diseases. Mutations and altered activity have been linked to congenital cataract, fleck corneal dystrophy, and neurodegenerative disorders, while its modulation by kinases such as SGK1 and Akt affects the trafficking and plasma membrane expression of ion channels and transporters. In cancer, PIKfyve activity contributes to invasive behavior and impacts tumor cell metabolism and immune microenvironment programming. Moreover, manipulation of its function shows promise in reversing pathogenic vacuolation, restoring receptor degradation, and even interfering with pathogen‐modified vacuolar compartments, thereby highlighting its potential as a therapeutic target in diverse pathological conditions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "27", "end_ref": "41"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ognian C Ikonomov, Diego Sbrissa, Krzysztof Mlak, et al. 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