Involved in vesicle trafficking and required for ciliogenesis, formation of primary non-motile cilium, and recruitment of RAB8A to the basal body of primary cilium. Component of the tectonic-like complex, a complex localized at the transition zone of primary cilia and acting as a barrier that prevents diffusion of transmembrane proteins between the cilia and plasma membranes. Involved in neuronal differentiation. As a positive modulator of classical Wnt signaling, may play a crucial role in ciliary signaling during cerebellum embryonic development (PubMed:21623382). Self-associates (PubMed:23532844). Part of the tectonic-like complex (also named B9 complex). Interacts with MKS1. Interacts with NPHP1; probably as heterodimers and/or AHI1(2):NPHP1(2) heterotetramers. Interacts (via SH3 domain) with the dynamin GTPase DNM2. Interacts with HAP1; probably as AHI1(2):HAP1(2) heterotetramers. Interacts with RAB8A (By similarity). Interacts with CEND1 (By similarity). Interacts with CTNNB1/beta-catenin (PubMed:21623382). Interacts with SPATA7 (By similarity). In the retinal photoreceptor cell layer, localizes at the connecting cilium. Highly expressed in the most primitive normal hematopoietic cells. Expressed in brain, particularly in neurons that give rise to the crossing axons of the corticospinal tract and superior cerebellar peduncles. Expressed in kidney (renal collecting duct cells) (at protein level). Down-regulated during early differentiation of normal hematopoietic cells. Up-regulated in leukemic cells at all stages of differentiation from patients with chronic myeloid leukemia. The disease is caused by variants affecting the gene represented in this entry. May be produced at very low levels due to a premature stop codon in the mRNA, leading to nonsense-mediated mRNA decay. Contaminating sequence. Potential poly-A sequence. Contaminating sequence. Potential poly-A sequence.