Rates of DNA evolution in Drosophila depend on function and developmental stage of expression
Article Abstract:
Three fractions of the Drosophila genome were used as tracers in DNA hybridization experiments to determine DNA sequence divergence in the embryonic and adult stages and to compare the two stages with respect to this parameter. Results indicate that embryonic messages are about 50% diverged compared to that of adults and at longer evolutionary distance message differences between adults and embryos disappear. Divergence in the coding DNA fraction was also found to be less thanthat in total single copy DNA.
Publication Name: Genetics
Subject: Biological sciences
ISSN: 0016-6731
Year: 1993
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A duplication including the Y allele of Lcp2 and the TRIM retrotransposon at the Lcp locus on the degenerating neo-Y chromosome of Drosophila miranda: molecular structure and mechanisms by which it may have arisen
Article Abstract:
Mechanisms for Y chromosome degeneration in Drosophila miranda are suggested. Two potential mechanisms for the process are enumerated: unequal crossovers and duplication, and transposition of a DNA region. It is shown that duplication includes the neo-Y chromosomal Lcp2 allele. The insertion site for TRIM is between neo-Y chromosomal alleles of Lcp2 and Lcp3. This proved that the duplication arose from the neo-Y chromosome.
Publication Name: Genetics
Subject: Biological sciences
ISSN: 0016-6731
Year: 1993
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Y chromosomes: Born to be destroyed
Article Abstract:
Y chromosome degeneration is a process that involves the extension of heterochromatinization and the expansion of genetic inertness from the original differential segment in neighboring sections and further along the proto-Y chromosome. The results indicate that the major force driving the degeneration of Y chromosomes are retrotransposons in remodeling former euchromatic chromosome structures into heterochromatic ones.
Publication Name: BioEssays
Subject: Biological sciences
ISSN: 0265-9247
Year: 2005
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