Involved in nuclear migration and anchoring in hypodermal precursor cells (PubMed:10375507, PubMed:11748140, PubMed:12169658, PubMed:11907270, PubMed:16481402, PubMed:20921138, PubMed:21411627, PubMed:23150597, PubMed:25023515, PubMed:25057012). Most likely recruits anc-1 to the nuclear envelope where anc-1 functions to tether the nucleus to the actin cytoskeleton (PubMed:12169658). Component of the unc-83-unc-84 LINC (LInker of Nucleoskeleton and Cytoskeleton) complex where it recruits and interacts with unc-83 to form a bridge connecting the nuclear envelope to the cytoskeleton which allows for nuclear transport along microtubules (PubMed:11748140, PubMed:16481402). Its role in nuclear migration may be in association with lamin, lmn-1 (PubMed:25057012). Regulates nuclear migrations in one-cell embryos, controlling the posterior migration of the male pronucleus following fertilization (PubMed:21798253). Not required for centrosome attachment to the nucleus (PubMed:10375507, PubMed:11907270). Plays a role in the maintenance of the nuclear envelope architecture in body wall muscle cells (PubMed:25023515). May be involved in DNA damage repair through an association with zyg-12 (PubMed:27956467). Potentially has roles in homologous recombination, double strand break repair and meiotic recombination (PubMed:27956467). Specifically, may in part inhibit non-homologous end joining repair, most likely through recruiting fan-1 to the nucleoplasm, to facilitate the repair of DNA cross-links (PubMed:27956467). Component of the unc-83-unc-84 LINC complex which contains at least unc-83 and unc-84 (PubMed:11748140, PubMed:16481402). Within the unc-83-unc-84 LINC complex interacts (via C-terminus) with unc-83; the interaction is probably required to recruit unc-83 to the nuclear membrane (PubMed:11748140, PubMed:16481402). Most likely interacts with anc-1; the interaction is probably required to recruit anc-1 to the nuclear envelope (PubMed:12169658). Interacts (via C-terminus) with zyg-12 (via C-terminus); the interaction is direct (PubMed:27956467). May interact with lmn-1; this interaction may be required to complete the connection between the nuclear lamina and the cytoskeleton (PubMed:25057012). Associated with nuclei during interphase, prophase, prometaphase, metaphase and early anaphase (PubMed:11907270). Released from nuclear membrane in the same time that the nuclear envelope disassembly, during late anaphase, and begins to reaccumulate in early telophase (PubMed:11907270). Localization at the nuclear envelope depends on lmn-1 (PubMed:11748140, PubMed:11907270). Co-localizes with unc-83 at the nuclear envelope, but its localization at the nuclear envelope does not depend on unc-83 (PubMed:11748140, PubMed:11907270). Expressed in all somatic cells (PubMed:11907270, PubMed:27956467). Not expressed in germ cells in the mitotic and transition zones of the gonad (PubMed:11907270). One study shows expression at the beginning of the late pachytene stage in the proximal gonad, but there is no expression in the male germline, suggesting expression is specific to oogenesis in hermaphrodites (PubMed:27956467). Expressed in all cells of embryos from the 26-cell stage (PubMed:10375507, PubMed:11907270). Then, it is ubiquitously expressed throughout the development (PubMed:10375507, PubMed:11907270). Not expressed between fertilization and the 26-cell stage (PubMed:11907270). Induced by DNA-damage. The SUN domain probably plays a role in the nuclear anchoring and/or migration. Required for the localization of unc-83 and anc-1 at the nuclear membrane.