ATP-binding RNA helicase involved in pre-mRNA splicing (Probable). Operates during embryogenesis. ATP + H2O = ADP + H(+) + phosphate Interacts with mep-1 and smn-1. Expressed throughout development but most strongly in embryos and the L4 larvae stage. Embryonic lethal. Defects in oocytogenesis and spermatogenesis. Approximately 80% of mutants have an abnormal somatic gonad and no vulva. Belongs to the DEAD box helicase family. DEAH subfamily. DDX16/PRP8 sub-subfamily.