Mutation in the endogenous aub locus on the SD-LosArenos chromosome, changing the catalytic glutamic acid required for RNA slicer activity into an alanine. A loxP cassette containing a w+* marker has also been introduced downstream of the 3' end of the aub gene.
aubHR-E721A/aub[+] is an enhancer of abnormal meiotic cell cycle phenotype of RanGAPSd
The segregation distortion seen in males carrying the SD-LosArenos Dp(2;2)RanGAPSD chromosome variant is enhanced (the k[[c]] value, or proportion of Dp(2;2)RanGAPSD-bearing progeny as the fraction of total progeny (corrected for viability), is significantly increased) if the males are also carrying a single copy of aubHR-E721A.