Nucleotide substitution: G2916A. Amino acid replacement: R?Q.
No defect detectable by Southern blotting in the 8.5kb SalI fragment corresponding to that included in P{fs-1}.
G2723381A
G2916A
R898Q | fs(1)Yb-PA
R?Q
In mutant ovarioles, the number of follicle cells and germ cells is reduced. This is not due to massive cell death.
Homozygous third larval instar ovaries have a normal overall morphology, and have the normal number and location of germline stem cells. Ovarioles of newly eclosed homozygous females generally have 1-3 egg chambers (instead of 5 as in wild type). 42% have no germline cells, 39% have undifferentiated germline cells and 17% have differentiated germline cells in the germarium. Ovarioles of newly eclosed fs(1)Yb1/Df(1)w258-45 females generally have 1-3 egg chambers (instead of 5 as in wild type). 8% have no germline cells, 5% have undifferentiated germline cells and 88% have differentiated germline cells in the germarium. Germline clonal analysis indicates that fs(1)Yb is not required in the germline for fertility.
Females lay reduced numbers of eggs, most of which remain vacuolated after deposition; a few develop into normal-appearing adults. No effect on males.
fs(1)Yb1 has female sterile phenotype, non-suppressible by hhhs.PI
fs(1)Yb1, hhhs.PI has increased cell number | oogenesis phenotype
fs(1)Yb1, hhhs.PI has increased occurrence of cell division | oogenesis phenotype
fs(1)Yb1 has germline stem cell phenotype, non-enhanceable by piwi1
fs(1)Yb1 has germline stem cell phenotype, non-suppressible by piwi1
fs(1)Yb1 is a non-enhancer of germline stem cell phenotype of piwi1
fs(1)Yb1 is a non-suppressor of germline stem cell phenotype of piwi1
fs(1)Yb1, hhhs.PI has stalk follicle cell | increased number phenotype
Heat-shocking fs(1)Yb1 heterozygotes that carry one or two copies of the hhhs.PI transgene induces the formation of large stalks composed of overproliferated somatic cells. Heat-shocking fs(1)Yb1 homozygotes (with hhhs.PI) induces the formation of large interfollicular stalks. Heat-shocking fs(1)Yb1 homozygotes with one or two copies of hhhs.PI, increases the number of egg chambers per ovariole, and increases the number of morphologically normal germaria in a dose dependant manner. Fertility is not restored.
fs(1)Yb1 is partially rescued by fs(1)Ybt6.4
fs(1)Yb1 is not rescued by fs(1)Ybt1.8
fs(1)Yb1 is not rescued by fs(1)Ybt3.9
fs(1)Yb1 is not rescued by fs(1)Ybt7.7
fs(1)Yb1 is not rescued by fs(1)Ybt7.2
fs(1)Yb1 is not rescued by fs(1)Ybt4.6