PIP5K1C

PIP5K1C encodes phosphatidylinositol-4-phosphate 5-kinase type 1γ (PIPKIγ), a lipid kinase that catalyzes the conversion of phosphatidylinositol 4-phosphate into phosphatidylinositol 4,5-bisphosphate (PIP₂), a key second messenger regulating signal transduction, vesicle trafficking, actin cytoskeleton dynamics, cell adhesion, and cell motility^[1][2]. Mechanistically, PIP5K1C organizes localized PIP₂ pools at focal adhesions and other membrane-associated signaling domains, thereby coordinating integrin-mediated adhesion and cytoskeletal remodeling^[3][1]. Through direct association with talin, PIPKIγ is recruited to focal adhesions, where it promotes integrin-talin coupling and regulates focal adhesion assembly and turnover^[3][1][4]. In addition to its adhesion-related functions, PIP5K1C contributes to clathrin-dependent endocytosis, synaptic vesicle trafficking, and directional cell migration, highlighting its central role in membrane dynamics and cellular signaling^[1][2]. Disease studies further demonstrate that altered PIP5K1C activity influences tumor-associated signaling pathways, including AKT-STAT3 signaling and cancer cell invasion, while genetic deficiency causes developmental abnormalities and tissue-specific defects in experimental models^[4][5]. Compared with the related isoforms PIP5K1A and PIP5K1B, PIP5K1C exhibits distinctive localization to focal adhesions and specialized interactions with talin, supporting nonredundant functions in adhesion-dependent signaling and migration^[3][1][4]. Although PIP5K1C remains an attractive therapeutic target, selective pharmacological modulators are currently less established than those available for other lipid signaling enzymes, making genetic and mechanistic approaches the primary tools for experimental investigation^[4][5].