Rates and patterns of base change in the small subunit ribosomal RNA gene

Article Abstract:

Substitution rates in base pairs of nucleotides were studied in the ribosomal RNA gene and used to analyze transversion probabilities for srDNA. The data set used were srDNA sequences of five species of animals and that of man. Stem, loop and bulge regions showed the same evolution rate and regions involved in protein interaction evolved the slowest. Structure associated biases were also observed in bases, with stems containing more cytosine and guanine. Differences in base composition were noted in vertebrate and invertebrate srDNA.

Analysis, DNA, Ribosomal RNA, Phylogeny, Nucleotides

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A novel mitochondrial genome organization for the blue mussel, Mytilus edulis

Article Abstract:

The mitochondrial DNA (mtDNA) arrangement of the blue mussel, Mytilus edulis was determined. Mytilus mtDNA isinherited biparentally, suggesting possible opportunity for recombination. The Mytilus mtDNA is 17.1 kb in length, with gene complements identical to that of other metazoans, expcept for the presence of two Met-tRNA genes. Similar to nematodes, it lacks a mitochondrial ATPase 8 gene. However, with regard to mitochondrial gene arrangement, Mytilus is highly divergent in comparison to other metazoans.

Metazoa, Metazoans, Mytilus edulis, Blue mussel

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Frequencies of mitochondrial DNA haplotypes in laboratory cage populations of the mosquito, Aedes albopictus

Article Abstract:

An examination of changes in frequencies of two mitochondrial DNA (mtDNA) haplotypes of the mosquito Aedes albopictus showed no increase in frequency for bidirectionally compatible mating strains. Females of unidirectionally compatible strains, however, showed a decrease in mtDNA in the F1 generation and an absence of mtDNA in the F2 generation. Ten generations of mosquitoes in different laboratory cages were examined.

Aedes albopictus, Aedes

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