RNA-binding protein that is required for primordial germ cell (PGC) differentiation and indirectly necessary for the migration of PGCs through the endoderm. May promote meiotic cell division during spermatogenesis. Shows a preference for G- and U-rich RNAs and probably binds the 3'-UTR of target mRNAs. Stimulates the initiation of translation of mRNAs through the recruitment of poly(A)-binding proteins (PABPs) (By similarity). Interacts with the C-terminus of pabp1 and with epabp. Prior to oocyte maturation, found in a complex with epabp and pum2 proteins and spdy1 mRNA; pum2 dissociates from the complex during maturation (By similarity). Belongs to the RRM DAZ family.