Imprecise excision of the P-element.
germline cyst | germline clone (with howr4)
testis | germline clone (with howr4)
Approximately 36% of howr17/howr4 mutant testes completely lack germline stem cells. Another 16% of testes show significant gaps in the ring of vas-positive cells, indicating a reduction in the number of germline stem cells. The remaining mutant germ cells are not found in organized cysts and different-sized germ cells are observed near the hub.
90% of homozygotes die during metamorphosis, with the head stuck in the thorax. Escapers have a strong held-out wing phenotype and have blisters on the wings.
howr17/howr4 is rescued by Scer\GAL4VP16.nanos.UTR/howL.UAS
howr17/howr4 is rescued by Scer\GAL4VP16.nanos.UTR/howS.UAS
Expression of howS.Scer\UAS in early germline stem cells under the control of Scer\GAL4nos.UTR.T:Hsim\VP16 rescues the howr17/howr4 germline stem cell phenotype.
Expression of howL.Scer\UAS in early germline stem cells under the control of Scer\GAL4nos.UTR.T:Hsim\VP16 rescues the howr17/howr4 germline stem cell phenotype.
how alleles form the following allelic series (strongest to weakest): howe44, howr17, howx3, hows2612.