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• W1969135781 abstract "In the three maternal effect lethal mutant strains of D. melanogaster described in this report, the homozygous mutant females produce defective eggs that cannot support normal embryonic development. The embryos from these eggs begin to develop for the first 2 hr after fertilization in an apparently normal way, forming a blastula containing a cluster of pole cells at the posterior end and a layer of syncytial blastoderm nuclei. During the subsequent transition from a syncytial to a cellular blastoderm, cell formation in the blastoderm is either partially or totally blocked. In mutant mat(3)1 no blastoderm cells are formed, indicating that there are separate genetic controls for pole cells and blastoderm cells. The other two mutants form an incomplete cellular blastoderm in which certain regions of the blastoderm remain noncellular. The noncellular region in mutant mat(3)3 is on the posterior-dorsal surface, covering about 30% of the total blastoderm. In mutant mat(3)6 blastoderm cells are formed only at the anterior and posterior ends, separated by a noncellular region that covers about 70% of the total blastoderm. The selective effects on blastoderm cell formation in the three mutants emphasize the importance of components present in the egg before fertilization for the transition from a syncytial to a cellular blastoderm. The genes defective in the three mutants are essential only for oogenesis and not for any other period of development, as indicated by a strict dependence of the lethal phenotypes on the maternal genotypes. Heterozygous embryos from the eggs of homozygous mutant females die, whereas homozygous mutant embryos from the eggs of heterozygous females develop into viable adults. One of the mutants, mat(3)3, has a temperature-sensitive phenotype. Homozygous mat(3)3 females maintained at a restrictive temperature of 29°C show the lethal maternal effect. However, at a permissive temperature of 20°C the females produce viable adult progeny. The temperature-sensitive period in mat(3)3 females occurs during the last 12 hr of oogenesis, consistent with the maternal effect phenotype of the mutant." @default.
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• W1969135781 date "1975-04-01" @default.
• W1969135781 modified "2023-09-27" @default.
• W1969135781 title "Localized defects of blastoderm formation in maternal effect mutants of Drosophila" @default.
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• W1969135781 doi "https://doi.org/10.1016/0012-1606(75)90027-5" @default.
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