During primary cilia disassembly, involved in cilia disassembly. Required specifically to control cilia retraction as well as the liberation and duplication of the basal body/centrosome. May act by stimulating AURKA activity at the basal body in a cell cycle-dependent manner. Interacts with proteins involved in ciliary transport, including ARL13B, CETN1, KIF3A, RAB6A, RAB8A, TUBB1 and TUBG1. Interacts with AURKA. Accumulates specifically at the basal body and ciliary necklace during the early steps of cilia assembly and disassembly, when structural, functional and regulatory proteins are delivered to cilia. At S phase, accumulates in vesicles and declines during mitosis. In node pit cells, found close to the ciliary membrane along the axoneme. In spermatocytes, localizes to particles along the stabilized microtubules of tails. Expressed in tissues rich in ciliated cells, such as lung, kidney, vas deferens and testis. Both isoforms 1 and 2 are expressed in testis. At 7.75 dpc, expression restricted to the ventral node monociliated pit cells. Not expressed in other tissues at detectable levels until 9.5 dpc. At 10.5 dpc, expressed in motor neurons in the ventral neural tube and in the apical ectodermal ridge of lim buds.