KIF27 is a member of the kinesin-4 family that plays an essential role in motile ciliogenesis by functioning as a cytoskeletal scaffold at the ciliary transition zone 1. Unlike typical kinesins, KIF27's motor activity is dispensable for its primary function; instead, it acts as a microtubule-associated scaffold to regulate transition zone architecture and enable proper incorporation of motility-generating proteins into cilia 1. KIF27 is one of the mammalian orthologs of Drosophila Costal-2 (Cos2), sharing structural homology including a kinesin motor catalytic domain and coiled-coil regions 2. Loss of KIF27 results in severe defects in axonemal structure and disrupted cilia beating, leading to phenotypes that recapitulate primary ciliary dyskinesia 1. While originally identified as a potential hedgehog signaling regulator like its Drosophila counterpart Cos2, studies indicate that KIF27 and its paralog KIF7 do not play significant roles in mammalian hedgehog transduction 3. The protein is expressed in testis, pancreatic islet, germ cell tumors, and Jurkat T cells 4. KIF27's transition-zone-associated activities likely represent a conserved mechanism for motile cilia assembly across diverse species and cell types 1.