P granule component, which acts redundantly with P granule component meg-2 to promote P granule segregation during embryogenesis, and germ cell proliferation and differentiation in larval stages (PubMed:18202375, PubMed:21305687, PubMed:25535836). In its phosphorylated form, and together with meg-2, promotes the disassembly of zygotic P granules in the anterior cytoplasm of pre-gastrulation embryos (PubMed:25535836). In its dephosphorylated form, and together with meg-2, promotes the assembly and accumulation of zygotic P granules in the posterior cytoplasm of pre-gastrulation embryos (PubMed:25535836). May function with the nanos family members nos-2 and nos-3 to promote germ cell proliferation during larval development (PubMed:21305687). Required for fertility (PubMed:18202375, PubMed:21305687). Interacts with pptr-1, pptr-2 and pgl-1. Localizes to P granules in embryogenesis (PubMed:18202375). Localization to P granules may depend on mes-1 (PubMed:18202375). Not expressed in the adult germline or in any somatic tissues. Expressed in the P lineage during embryogenesis (PubMed:18202375). First expressed at the 4- to 8-cell stage, and expression remains throughout the remaining P cell divisions in P2, P3 and P4 cells, and subsequently in primordial germ cells Z2 and Z3 (PubMed:18202375). Expression begins to diminish at the 100-cell stage (PubMed:18202375). Phosphorylated by mbk-2, which promotes the disassembly of zygotic P granules in the anterior cytoplasm of pre-gastrulation embryos (PubMed:25535836). Dephosphorylated by a phosphatase complex containing the PP2A regulatory subunit pptr-1, which promotes the assembly and accumulation of zygotic P granules in the posterior cytoplasm of pre-gastrulation embryos (PubMed:25535836). RNAi-mediated knockdown results in sterility, and in P granule segregation defects (PubMed:18202375). Simultaneous RNAi-mediated knockdown of meg-1 and meg-2 results in defects in P granule disassembly in the anterior cytoplasm of the P1 blastomere causing some P granules to be mis-segregated to somatic blastomeres (PubMed:25535836).