Accumulation of adenine and thymine in a groE-homologous operon of an intracellular symbiont.
As a result of the nucleotide sequence analysis of an aphid endosymbiont's operon homologous to the Escherichia coli groE, we noted that directional base substitutions tending toward an increase of A + T content represent an obvious evolutionary trend in this prokaryotic operon, housed for a long period by an eukaryotic cell. This result, when taken together with previous reports, raised the possibility that genomic DNA of prokaryotes residing in an eukaryotic cell is subject to A/T-biased directional mutation pressure and/or both negative and positive selection operating under conditions specific to the intracellular environments.[1]References
- Accumulation of adenine and thymine in a groE-homologous operon of an intracellular symbiont. Ohtaka, C., Ishikawa, H. J. Mol. Evol. (1993) [Pubmed]
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