Homozygous embryos show a defect in germ cell migration.
Stage 13 embryos derived from homozygous female germline clones mated to wild-type males (these embryos lack maternal but not zygotic ttv+ function) show a range of germ cell migration defects. In some cases, a subset of germ cells fail to coalesce, while in other cases, most of the germ cells have scattered. More than 40% of the embryos have five or more "lost" germ cells that have failed to coalesce with the somatic gonadal precursor cells (less than 5% of wild-type embryos have this many "lost" germ cells).
No defects in mesoderm migration are seen in mutant embryos. The invaginating stomatogastric nervous system appears normal.
ttv[+]/ttvunspecified is an enhancer of germline cell phenotype of hhMrt
ttvunspecified dominantly enhances the severity of the mild germ cell migration defects seen in hhMrt heterozygous embryos.
ttvunspecified is rescued by ttvUAS.Tag:MYC/Scer\GAL4unspecified
The segment polarity phenotype of ttvunspecified embryos is rescued by ttvScer\UAS.T:Hsap\MYC expressed under the control of Scer\GAL4unspecified.