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). {ECO:0000250|UniProtKB:Q9D8C8, ECO:0000269|PubMed:30168418, ECO:0000269|PubMed:30230954}. This is the function of ENSG00000160813 (PPP1R35, protein phosphatase 1 regulatory subunit 35).