Involved in sister chromatid cohesion during mitosis and meiosis (PubMed:18923084, PubMed:22927794, PubMed:30921322). In association with the gsp-2 phosphatase, it both restricts the localization and antagonizes the function of the air-2 kinase during meiosis I and mitosis to promote chromatid cohesion and spindle attachment (PubMed:18923084, PubMed:22927794, PubMed:29483514, PubMed:30921322). This in turn, drives germ cell immortality (PubMed:30921322). Furthermore, may play a role in ensuring the timely assembly of the synaptonemal complex during prophase I of meiosis (PubMed:18923084, PubMed:22927794). Interacts with gsp-1 and gsp-2; the interaction is direct. Recruited to chromosomes by smc-3 which is a component of the cohesin complex, and the proteins htp-1, htp-2 and htp-3 (PubMed:22927794, PubMed:29483514). Localizes to chromosomes in the mid-pachytene phase of prophase I to the end of meiosis I (PubMed:18923084, PubMed:30921322). Localizes to the long arms of chromosomes during diakinesis phase of prophase I of meiosis (PubMed:18923084, PubMed:30921322). Does not localize to chromosomes in meiosis II (PubMed:18923084). Localizes to chromosomes in prophase of mitosis in the first embryonic division and subsequently from late prophase to anaphase during early embryonic division (PubMed:18923084). Expressed in 1- to 100-cell stage embryos. RNAi-mediated knockdown results in embryonic lethality in 57% of animals, and of the surviving progeny, there is a 6% increase in the number of males (Him phenotype) (PubMed:18923084). Defective sister chromatid cohesion during meiosis and mitosis (PubMed:18923084, PubMed:22927794). Mis-localized air-2 in oocytes at the diakinesis phase of prophase I in meiosis (PubMed:18923084, PubMed:22927794). Impaired meiotic DNA double-strand break repair as evidenced by increased rad-51 positive nuclei throughout late pachytene to early diplotene in gonads, and impaired number of crossover recombination events between chromatids (PubMed:22927794). Absent syp-1, a core component of the synaptonemal complex, at the pachytene stage of meiosis (PubMed:22927794). Reduced expression of the gsp-2 phosphatase (PubMed:30921322).