In embryos laid by Dhc64C8-1/Dhc64C6-10 females the force (applied with optical tweezers) required to stall plus end travel of lipid droplets is significantly less than for wild-type embryos. The velocity of plus end droplet travel is significantly reduced in these mutants, especially over long runs (500-1000 nm), as is the mean plus end travel distance. In addition, the frequency of pauses during plus end travel is increased. All these effects are also seen, although more weakly, in embryos from Dhc64C8-1/+ mothers. There is no difference in the force required to stall minus end travel of lipid droplets in embryos from Dhc64C8-1/+ mothers, although mean minus end travel distance is reduced.
Dhc64C8-1/Dhc64C6-10 animals survive to give fertile adults. Embryos laid by Dhc64C8-1/Dhc64C6-10 females develop seemingly normally through cellularisation and early gastrulation. However, lipid droplets fail to redistribute from the centre towards the periphery of these embryos during early cycle 14, in contrast to wild type. This results in embryos that are abnormally transparent from gastrulation onward.
Lethality acts during larval, pupal or pharate adult phase. Low levels (3-12%) of embryonic lethality are observed.