Sequence analysis of active mariner elements in natural populations of Drosophila simulans

Article Abstract:

The active and inactive mariner elements present in natural populations of Drosophila simulans were analyzed and compared to similar elements in laboratory stains of D. mauritiana. Sequence analysis showed that all elements are 1286 base pairs in length, except for one inactive element which was spanned 1285 base pairs. A consistent difference between active and inactive elements was a T-A base substitution at position 1203. Comparisons among species showed high levels of similarity between active mariner elements. Furthermore, similarities were also observed between the D. simulans and D. mauritiana mariner and peach elements, respectively.

Analysis, Transposons

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Codon usage bias and base composition of nuclear genes in Drosophila

Article Abstract:

Researchers compared formations of codon-usage bias with base compositions of exons and introns to understand the elements that influence the differing evolutionary rates and codon-usage bias in the Drosophila nuclear genome. Preferential limitations exist at the translational level for synonymous regions and the neutral or almost neutral nature of large sections of nucleotide sequence in the encoding areas.

Usage, Codon, Codons

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Variable rates of evolution among Drosophila opsin genes

Article Abstract:

A comparison of the DNA sequences and location of chromosomes of four Drosophila pseudoobscura and Drosophila melanogaster opsin genes showed that rates of both synonymous site substitution and amino acid identities varied widely. This indicates the existence of diverse selective pressures on the evolution of the Drosophila multigene family.

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