DNA helicase that may play a role in the repair of DNA that is damaged by ultraviolet light or other mutagens. Exhibits a magnesium-dependent ATP-dependent DNA-helicase activity that unwinds single- and double-stranded DNA in a 3'-5' direction. ATP + H2O = ADP + H(+) + phosphate dATP + H2O = dADP + H(+) + phosphate Interacts with EXO1. Interacts with MLH1. Expressed in all tissues examined. Only expressed in spermatocytes. Expression increases at pachytene (17 days old) and decreases after completion of meiosis II (7 weeks old). Belongs to the helicase family. RecQ subfamily.