During centriole duplication, plays a role in the centriole elongation by promoting the recruitment of the microtubule-binding elongation machinery through its interaction with RTTN, leading to the centriole to centrosome conversion (PubMed:30168418, PubMed:30230954). In addition, may play a role in the primary cilia assembly (By similarity). Interacts with PPP1CA; this interaction mediates the PPP1CA phosphatase activity inhibition (PubMed:19389623, PubMed:30230954). Interacts with RTTN; this interaction allows the mutual recruitment to the centriole (PubMed:30168418). Recruited to the nascent daughter centriole early in the duplication cycle and localizes to the proximal centriolar lumen just above the cartwheel (PubMed:30168418, PubMed:30230954). Co-localizes with RTTN at the centriole (PubMed:30168418). Belongs to the PPP1R35 family.