ATP-dependent RNA helicase. ATP + H2O = ADP + H(+) + phosphate Also detected in chromatoid bodies of round spermatids. An mRNA component of germ plasm. Localizes to the granulo-fibrillar material (GFM) of the mitochondrial cloud in stage I oocytes. Associated, at a low level, with the periphery of mature germinal granules in later stage oocytes. Localizes to the vegetal cortex in stage II oocytes and segregates with germ plasm during early embryogenesis. In adults, expression is restricted to the ovary and, at a lower level, to spermatogonia, spermatocytes and spermatids of the testis. Expressed at a constant level throughout oogenesis and in the egg. Levels decrease during gastrulation and are not detectable by the end of gastrulation. Belongs to the DEAD box helicase family.