Centriole-enriched microtubule-binding protein involved in centriole biogenesis (PubMed:20844083, PubMed:25131205, PubMed:27185865, PubMed:38154379). Essential for the generation of the distal portion of new-born centrioles in a CPAP- and CEP120-mediated elongation dependent manner during the cell cycle S/G2 phase after formation of the initiating cartwheel structure (PubMed:27185865). Required for the recruitment of centriolar proteins, such as POC1B, POC5 and CEP135, into the distal portion of centrioles (PubMed:27185865). Also required for centriole-to-centrosome conversion during mitotic progression, but is dispensable for cartwheel removal or centriole disengagement (PubMed:25131205). Binds to and stabilizes centriolar microtubule (PubMed:27185865). May be involved in ciliogenesis (PubMed:38154379). {ECO:0000269|PubMed:20844083, ECO:0000269|PubMed:25131205, ECO:0000269|PubMed:27185865, ECO:0000269|PubMed:32060285, ECO:0000269|PubMed:38154379}. This is the function of ENSG00000166004 (CEP295, centrosomal protein 295).