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The Drosophila sex determination gene snf is utilized for the establishment of the female-specific splicing pattern of Sex-lethal.
TLDR
It is demonstrated that the lack of female progeny is due to aberrant Sex-lethal regulation in late embryogenesis, and it is suggested that the wild-type product of snf plays an important role in establishing the female-specific RNA splicing pattern of Sex- lethal.
The Drosophila maternal effect locus deadhead encodes a thioredoxin homolog required for female meiosis and early embryonic development.
TLDR
The genetic and molecular data are consistent with a function during meiosis and preblastoderm mitosis, and whether the head defect indicates an additional function or is an indirect consequence of earlier defects remains to be determined.
Mechanisms of sod2 gene amplification in Schizosaccharomyces pombe.
TLDR
Data suggest that amplicon formation may begin with DNA lesions such as breaks, and that LiCl-resistant mutants arise 200-600 times more frequently in strains deficient for topoisomerases or DNA ligase activity than in wild-type strains, but the mutant cells contain the same amplicons.
Mutations in the predicted aspartyl tRNA synthetase of Drosophila are lethal and function as dosage-sensitive maternal modifiers of the sex determination gene Sex-lethal
TLDR
The data suggest that stable activation of Sex-lethal in the embryo may be particularly sensitive to perturbation of the translational machinery.
The integration of activity cycles in the behaviour of Arenicola marina L.
TLDR
Cyclic behaviour patterns were found, remarkably similar to those which intact worms exhibit under favourable conditions, and in which two components were conspicuous: feeding cycle and extrovert trace, which appear to compete for territory.
The role of oesophageal rhythms in the behaviour of the Arenicola ecaudata Johnston.
TLDR
There is little evidence of a pacemaker role of the oesophagus in ecaudata, and if the movements of the extroverted and body wall are simultaneously recorded, they generally exhibit correlated outbursts of variable and fluctuating pattern, and very unlike the behaviour of the brainless extrovert.
Effects of genome position and the DNA damage checkpoint on the structure and frequency of sod2 gene amplification in fission yeast.
TLDR
Analysis of LiCl-resistant strains in this genetic background found that the only observed mechanism of resistance is amplification of sod2, and proximity to a telomere is not a prerequisite for gene amplification in S. pombe but does affect the mechanism.