egg | maternal effect (with vncBDk)
egg chamber (with vncBDk)
female fusome (with vncBDk)
nurse cell (with vncBDk)
Homozygous and vnc14/vncBDk females produce fewer eggs than wild type, the majority of which are shortened along the anterior/posterior axis and collapsed. Eggs laid by mutant females often have defects in the shape or position of the dorsal appendages (24.6% for homozygous females and 28.2% for vnc14/vncBDk females), such as appendages that are closely apposed or fused. Many egg chambers that appear to be at stage 11 or older based on follicle cell morphology contain unusually small oocytes and persistent nurse cells, phenotypes typically resulting from a failure of nurse cells to dump their contents into the oocyte (44.4% for homozygous females and 38.5% for vnc14/vncBDk females). 50% of homozygous egg chambers contain abnormal numbers of germline cells, showing both defects in cystocyte division (both too many and too few division) and in cyst encapsulation. 13.3% of vnc14/vncBDk egg chambers contain abnormal numbers of germline cells showing both defects in cystocyte division and in cyst encapsulation. Fusome defects are seen in 46.7% of homozygous and 28.3% of vnc14/vncBDk germaria. Chromatin reorganisation in the nurse cell nuclei is disrupted in mutant egg chambers, with many of the nurse cells beyond stage 5 retaining the condensed "five-blob" configuration of chromatin (70.3% of homozygous nurse cells, 72.8% of vnc14/vncBDk nurse cells) in contrast to wild-type nurse cells at this stage (3.2%).
Hemizygous vnc14/Df(3L)AC1 females produce no eggs. Homozygous vnc14 females produce a few flaccid eggs with abnormal chorions (abnormal numbers of chorionic filaments and thin chorionic membranes). vnc2/vnc14 heterozygotes do produce eggs. Hemizygous vnc14/Df(3L)AC1 ovaries are small and comprised of tumorous egg chambers. Nuclei within these egg chambers appear undifferentiated. Homozygous vnc14 egg chambers range from too few through normal numbers to too many nurse cells.
vnc14 slightly weaker phenotype than vnc2.
vnc2 and vnc14 contain a copia insertion in an identical location.