Molecular phylogeny and rearrangement of rRNA genes in Rickettsia species - PubMed (original) (raw)
Molecular phylogeny and rearrangement of rRNA genes in Rickettsia species
S G Andersson et al. Mol Biol Evol. 1999 Jul.
Abstract
It has previously been observed that Rickettsia prowazekii has an unusual arrangement of the rRNA genes. In this species, the three rRNA genes, 16S (rrs), 23S (rrl), and 5S (rrf), are not linked in the typical arrangements for bacteria. Rather, the 16S rRNA gene has been separated from the 23S and 5S rRNA gene cluster, and the 23S rRNA gene is preceded by a gene which codes for methionyl-tRNAf(Met) formyltransferase (fmt). In this study, we screened the genus Rickettsia for the fmt-rrl motif in order to examine the phylogenetic depth of this unusual rRNA gene organization. A rearranged operon structure was observed in Rickettsia conorii, Rickettsia parkeri, Rickettsia sibirica, Rickettsia rickettsii, Rickettsia amblyomii, Rickettsia montana, Rickettsia rhipicephali, Rickettsia australis, Rickettsia akari, Rickettsia felis, Rickettsia canada, and Rickettsia typhi. There is also evidence for a divided operon in Rickettsia belli, but in this species, the fmt gene could not be identified upstream of the 23S rRNA gene. In order to place the rearrangement event in the evolutionary history of the Rickettsia, phylogenetic analyses were performed based on the fmt-rrl spacer regions and the 23S rRNA genes. Based on these phylogenies, we suggest that the genomic rearrangement of the rRNA genes preceded the divergence of the typhus group and the spotted fever group Rickettsia. The unique organization of the 23S rRNA genes provides a simple diagnostic tool for identification of Rickettsia species.
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