RNA-binding factor that positively regulates gene expression by prohibiting miRNA-mediated gene suppression. Relieves miRNA repression in germline cells. Prohibits the function of several miRNAs by blocking the accessibility of target mRNAs (By similarity). Sequence-specific RNA-binding factor that binds to U-rich regions (URRs) in the 3'untranslated region (3'-UTR) of several mRNAs (By similarity). Does not bind to miRNAs (By similarity). Germline-specific protein required for the primordial germ cell (PGC) survival and migration during early embryonic development. Perinuclear germ granules, also called germ plasm or chromatoid body. Expressed in the germ plasm and the primordial germ cells (PGCs). At the onset of embryogenesis, maternal product is located in granules distributed throughout the cortex of the one-cell stage embryo. At 0.5 hour post fertilization (hpf) is expressed at the vegetal part of the blastomere. At 1 hpf expressed at the distal parts of the first two cleavage furrows. At 4 hpf expressed exclusively in PGCs. Expressed in PGCs during their migration and at their arrival in the presumptive gonade. At 5 days post-fertilization (dpf) still expressed in PGCs, albeit at a lower level.