Insertion of a 1.4kb hopper element into the male specific exon 3 of Sxl. The insertion splits the exon into 135bp and 60bp segments. The direction of transcription of the hopper element with respect to Sxl is unknown.
2 kb insert near male-specific exon 3.
SxlM4, dmP0/dmP0 females are fully viable. While a SxlM4/+ background rescues the female-specific lethality of dmP0, it does not rescue the dmP0 bristle or female sterility phenotypes. No SxlM4, dmP0/dmP0 males are recovered from the cross.
FlyBase curator comment: subsequent publication (FBrf0134557) calls into question the validity of the genetic interaction between bbflex-2 and SxlM alleles (SxlM1 and SxlM4) stated in FBrf0111803. The suppression of the male lethality by bbflex-2 is slightly temperature dependent with fewer males surviving at 29oC than at 25oC. The resulting males are viable and fertile with no evidence of transformation.
The daughters of females with homozygous vir6 germ line clones are rescued if the daughters carry SxlM4; SxlM4/+ ; vir6/+ animals develop as normal females. SxlM4/+ ; vir6/vir2f animals derived from females carrying homozygous vir6 germ line clones mated to vir2f/+ males survive, but are sexually transformed. Does not rescue the lethality of embryos derived from females with homozygous vir3 or vir4 germ line clones mated to vir+ males.