Mutant egg chambers show a polyploid oocyte nucleus phenotype. They also show defects in karyosome morphology; the nuclear material is seen to line the inside of the nuclear membrane.
Eggs derived from hemizygous females show a cold-sensitive ventralised egg-shell phenotype. More than 95% of the ventralised eggs have a single dorsal appendage at 18oC.
Egg chambers exhibit doubling of the number of nurse cells, or in a small number of cases the egg chambers are bipolar or have less than 15 nurse cells. Phenotype is more severe at 25oC.
encQ4 is an enhancer of egg chamber phenotype of Rbfox1CC00511