Required both for centrosome duplication and maturation (PubMed:15068791, PubMed:15186742, PubMed:19081077). Required for pericentriolar material (PCM) recruitment (PubMed:15068791, PubMed:15186742). Localizes to the centriole throughout the cell cycle and accumulates on the PCM during mitosis (PubMed:15068791, PubMed:15186742). Requires spd-5 for its accumulation on the PCM (PubMed:15068791, PubMed:15186742). Recruitment to the centrosome during prophase of the 1-cell embryo is regulated by the cye-1/cdk-2 complex (PubMed:17115027). Associates with centrosomes, during nearly all of the developmental stages. In the hermaphrodite gonad, it localizes as discrete perinuclear foci in the mitotic portion of the germline. These foci are also evident during the early stages of oogenesis but are absent in mature oocytes. In contrast, in mature sperm these foci are present with each male gamete containing a single dot adjacent to the nucleus. Similarly, in meiotic stage embryos, a single expression dot is observed next to the male pronucleus. In slightly older embryos, one or two perinuclear foci are observed. The intensity of the foci increase with the age of the embryos and at mitosis it localizes to both spindle poles. As embryos progress through anaphase and telophase, the intensity of staining gradually diminishes. Careful examination of the staining pattern at this stage reveals a diffuse expression centered on one or two very bright dots corresponding to both centrioles as well the pericentriolar region.