Required for normal spindle assembly. Plays a key role in mother-centriole-dependent centriole duplication; the function seems also to involve CEP152, CDK5RAP2 and WDR62 through a stepwise assembled complex at the centrosome that recruits CDK2 required for centriole duplication. Also recruits CDK1 to centrosomes (By similarity). Plays a role in DNA damage response. Following DNA damage, such as double-strand breaks (DSBs), is removed from centrosomes; this leads to the inactivation of spindle assembly and delay in mitotic progression (By similarity). Interacts with CEP152 and CDK1; these interactions recruit both ligands to centrosomes. Interacts with CDK2, CDK5RAP2, WDR62, CEP90, KIAA0753/moonraker an CCDC14. CEP63, CDK5RAP2, CEP152, WDR62 are proposed to form a stepwise assdembled complex at the centrosome forming a ring near parental centrioles. Interacts with CCDC57; the interaction is required for their location to proximal end of centrioles (By similarity). Colocalizes with CDK5RAP2, CEP152 and WDR62 in a discrete ring around the proximal end of the parental centriole. At this site, a cohesive structure is predicted to engage parental centrioles and procentrioles (By similarity). Belongs to the CEP63 family.