ISSN:
1432-1432
Keywords:
Aphid
;
Intracellular symbiont
;
groE operon
;
Nucleotide sequence
;
Codon usage
;
Directional mutation
;
A/T pressure
;
Selection
;
Cell organelles
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary As a result of the nucleotide sequence analysis of an aphid endosymbiont's operon homologous to theEscherichia 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00166247
Permalink
