May be required for efficient PLK4 centrosomal localization and PLK4-induced overduplication of centrioles. May play a role in cilium biogenesis. Interacts with PLK4. Interacts with FAM161A. Mainly localizes at the centriolar wall, but also found in the pericentriolar material. Expressed in photoreceptor inner segment. Expressed by photoreceptor cells in the retina. Expressed at all stages of development with higher expression during embryogenesis. Belongs to the CEP78 family.