KIF13A (kinesin family member 13A) is a plus end-directed microtubule motor protein that plays critical roles in intracellular vesicle transport and cellular polarization. The protein mediates transport of mannose-6-phosphate receptor-containing vesicles from the trans-Golgi network to the plasma membrane through direct interaction with the AP-1 complex 1. In melanocytes, KIF13A coordinates with AP-1 to create peripheral recycling endosomal subdomains essential for delivering melanogenic enzymes to maturing melanosomes 1. A key regulatory mechanism involves phosphorylation by MARK2 kinase at serine 1371, which creates a 14-3-3 binding site that controls KIF13A's activity in neuronal polarization 23. This phosphorylation-dependent regulation is crucial for restricting dendrite-selective vesicles from entering axons, thereby maintaining neuronal polarity 3. KIF13A also contributes to cancer cell invasion by coordinating with KIF3A to transport MT1-MMP-containing vesicles to the plasma membrane 4. The gene has been implicated in various diseases, including potential susceptibility to schizophrenia due to its chr6 location and neuronal expression pattern 5, and progressive supranuclear palsy through genome-wide association studies 6. Pan-cancer analysis reveals differential expression patterns across tumor types, suggesting context-dependent oncogenic roles 7.