Molecular adapter that recruits protein complexes required for cilium assembly and function to the cilium basal body (PubMed:19852954, PubMed:23955340, PubMed:27979967, PubMed:32051257). At the exit of mitosis, localizes to the basal body and ciliary base of the forming primary cilium where it recruits and activates RAB8A to direct vesicle-mediated transport of proteins to the cilium (By similarity). Also recruits the BBSome, a complex involved in cilium biogenesis, by bridging it to PCM1 at the centriolar satellites of the cilium (PubMed:27979967). It is also required for the recruitment to the cilium basal body of the intraflagellar transport (IFT) machinery as well as the ciliary appendage proteins CEP164 and NINEIN (By similarity). Functions as a regulator of Hedgehog signaling both through its role in cilium assembly but also probably through its ability to retain GLI3 within the cytoplasm (By similarity). It is involved in spermatogenesis through its role in organization of the basal body and assembly of the sperm flagellum (PubMed:32051257). Also indirectly involved in heart development through its function in ciliogenesis (PubMed:31118289). Interacts with DAZ1 (PubMed:12511597, PubMed:15081113). Interacts with the BBSome; recruits the BBSome to centriolar satellites of the cilium (PubMed:27979967). Interacts with PCM1; localizes DZIP1 and the associated BBSome to centriolar satellites (PubMed:27979967). Interacts with RAB8A (GDP-bound inactive form); recruits RAB8A to the basal body of the cilium and prevents its inhibition by GDI2 (PubMed:25860027). Interacts with GDI2; negatively regulates the interaction of GDI2 with GDP-bound RAB8A (PubMed:25860027). Interacts with GLI3; retains GLI3 within the cytoplasm (PubMed:23955340). Interacts with CEP164 (By similarity). Interacts with IFT88 (By similarity). Localizes to the centriole in cells lacking cilia and to the cilium basal body in ciliated cells (PubMed:19852954). At the exit of mitosis, when the primary cilium is reassembled in daughter cells, localizes at the mother centriole that acts as the basal body of the assembling primary cilium and also accumulates at the ciliary base that constitutes a diffusion barrier for ciliary proteins (By similarity). Predominantly expressed in testis (at protein level) (PubMed:15081113, PubMed:32051257). Also expressed in fetal brain, adult oocytes and ovary (PubMed:15081113). Expressed in undifferentiated ES cells (PubMed:15081113). In testis, it is specifically expressed in germ cells (at protein level) (PubMed:15081113, PubMed:32051257). Expressed in mature germ cells and secondary spermatocytes, while it is weakly or not expressed in primary spermatocytes (PubMed:15081113). Phosphorylation at Ser-226 by PLK1 before mitosis prevents interaction with PCM1 and localization to centriolar satellites. Thereby, it negatively regulates the localization of the BBSome to centriolar satellites. The disease is caused by variants affecting the gene represented in this entry. The disease is caused by variants affecting the gene represented in this entry. Belongs to the DZIP C2H2-type zinc-finger protein family. Contaminating sequence. Potential poly-A sequence. Extended N-terminus. Truncated N-terminus.