Journal
BIOCHEMICAL GENETICS
Volume 47, Issue 9-10, Pages 635-644Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10528-009-9255-1
Keywords
5S ribosomal DNA; Birth-and-death evolution; Ensis; Mollusca; Bivalvia
Funding
- Conselleria de Educacion e Ordenacion Universitaria (Xunta de Galicia, Spain)
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A study of nucleotide sequence variation of 5S ribosomal DNA from six Ensis species revealed that several 5S ribosomal DNA variants, based on differences in their nontranscribed spacers (NTS), occur in Ensis genomes. The 5S rRNA gene was not very polymorphic, compared with the NTS region. The phylogenetic analyses performed showed a between-species clustering of 5S ribosomal DNA variants. Sequence divergence levels between variants were very large, revealing a lack of sequence homogenization. These results strongly suggest that the long-term evolution of Ensis 5S ribosomal DNA is driven by birth-and-death processes and selection.
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