Involved in the maintenance of both rod and cone photoreceptor cells (By similarity). Required for photoreceptor-specific localization of proximal connecting cilium (CC) proteins RPGR, AHI1, NPHP1, NPHP4, and RPGRIP1 at the distal CC, a photoreceptor-specific extension of the primary cilium transition zone (By similarity). Maintenance of protein localization at the photoreceptor-specific distal CC is essential for normal microtubule stability and to prevent photoreceptor degeneration (By similarity). Found in a complex with CFAP410, NEK1 and SPATA7 (By similarity). Interacts with NEK1 (By similarity). Interacts with RPGRIP1 (By similarity). Interacts with RPGR (By similarity). Interacts with NPHP4 (By similarity). Interacts with NPHP1 (By similarity). Interacts with AHI1 (By similarity). Localizes to the microtubule network. In early prophase of primary spermatocytes.