Binds to single and double-stranded DNA and exhibits DNA-dependent ATPase activity. Underwinds duplex DNA (By similarity). Spindle genes are required for each of the symmetry-breaking steps that generate polarity during egg axis formation; oocyte positioning at the posterior of the cyst to generate the first AP polarity and inhibition of gurken (grk) signaling to the follicle cell layer to polarize first the AP axis and then DV axis. May have a role in female meiosis. Highly expressed in ovaries. Belongs to the RecA family. RAD51 subfamily.