Genetic analysis of housekeeping genes of members of the genus Acholeplasma: phylogeny and complementary molecular markers to the 16S rRNA gene.

The partial nucleotide sequences of the rpoB and gyrB genes as well as the complete sequence of the 16S-23S rRNA intergenic transcribed spacer (ITS) were determined for all known Acholeplasma species. The same genes of Mesoplasma and Entomoplasma species were also sequenced and used to infer phylogenetic relationships among the species within the orders Entomoplasmatales and Acholeplasmatales. The comparison of the ITS, rpoB, and gyrB phylogenetic trees with the 16S rRNA phylogenetic tree revealed a similar branch topology suggesting that the ITS, rpoB, and gyrB could be useful complementary phylogenetic markers for investigation of evolutionary relationships among Acholeplasma species. Thus, the multilocus phylogenetic analysis of Acholeplasma multilocale sequence data (ATCC 49900 (T) = PN525 (NCTC 11723)) strongly indicated that this organism is most closely related to the genera Mesoplasma and Entomoplasma (family Entomoplasmataceae) and form the branch with Mesoplasma seiffertii, Mesoplasma syrphidae, and Mesoplasma photuris. The closest genetic relatedness of this species to the order Entomoplasmatales was additionally supported by the finding that A. multilocale uses UGA as the tryptophan codon in its gyrB and gyrA sequences. Use of the UGA codon for encoding tryptophan was previously reported as a unique genetic feature of Entomoplasmatales and Mycoplasmatales but not of Acholeplasmatales. These data, as well as previously published data on metabolic features of A. multilocale, leads to the proposal to reclassify A. multilocale as a member of the family Entomoplasmataceae.

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