Plays an important role in centriole assembly and/or stability and ciliogenesis (PubMed:20008567, PubMed:32060285). Involved in early steps of centriole duplication, as well as in the later steps of centriole length control (PubMed:19109428). Acts in concert with POC1A to ensure centriole integrity and proper mitotic spindle formation (PubMed:32060285). Required for primary cilia formation, ciliary length and also cell proliferation (PubMed:23015594). Required for retinal integrity (PubMed:25044745). Acts as a positive regulator of centriole elongation (PubMed:37934472). {ECO:0000269|PubMed:19109428, ECO:0000269|PubMed:20008567, ECO:0000269|PubMed:23015594, ECO:0000269|PubMed:25044745, ECO:0000269|PubMed:32060285, ECO:0000269|PubMed:37934472}. This is the function of POC1B (POC1 centriolar protein B, Ensembl gene identifier ENSG00000139323).