Kinesin-like protein KIF3A

KIF3A (Kinesin-like protein 3A) is a microtubule-based motor protein that functions as an anterograde translocator for membranous organelles along microtubules. It exhibits plus end-directed microtubule sliding activity and plays critical roles in primary cilia formation, centriole cohesion, subdistal appendage organization, and ciliary basal feet assembly (UniProt: Q9Y496). The protein is essential for proper centriole function and microtubule anchoring to the mother centriole.

KIF3A operates within cellular transport and cilia-related pathways, which are fundamental to neuronal physiology and brain development. While no primary disease association is listed in UniProt, the protein's involvement in intracellular trafficking and ciliary function implicates it in processes relevant to neurodegeneration.

In Alzheimer's Disease, KIF3A is down-regulated in post-mortem AD brain tissue compared to age-matched controls, with a mean log2 fold-change of −0.47 (Chaparral AD proteomics). This finding was derived from TMT-labeled proteomics analysis of four subcellular fractions from human post-mortem brain. The reduction in KIF3A may reflect impaired axonal transport capacity or cilia dysfunction in the AD brain.