Has a broad role in development, specifically in the genetic pathway SynMuvB that negatively regulates specification of the vulval cell fate. Required for fem-3 3'-UTR-mediated repression in the regulation of the sperm/oocyte switch. Acts by regulating the translation of fem-3 mRNA, by binding to its 3'-UTR (By similarity). Interacts with hda-1, let-418, lin-1, mog-1, mog-4, mog-5, mog-6, pie-1 and unc-98. Found in all nuclei in the germline, including oocytes, but not those of mature sperm and spermatocytes.