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 (By similarity). In addition may play a role in the primary cilia assembly (By similarity). Interacts with PPP1CA; this interaction mediates the PPP1CA phosphatase activity inhibition. Interacts with RTTN; this interaction allows the mutual recruitment to the centriole. Recruited to the nascent daughter centriole early in the duplication cycle and localizes to the proximal centriolar lumen just above the cartwheel. Co-localizes with RTTN at the centriole. Belongs to the PPP1R35 family.