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Phylogenetic Relationships of Three Porcine Mycoplasmas, Mycoplasma hyopneumoniae, Mycoplasma flocculare, and Mycoplasma hyorhinis, and Complete 16S rRNA Sequence of M. flocculare

¹Department of Microbiology, University of Alberta, Edmonton, Alberta, T6G 2E9, Canada
²Laboratoire de Biologie Cellulaire et Moleculaire, Institut National de la Recherche Agronomique et UniversitÉ de Bordeaux II, Domaine de la Grande Ferrade, 33883 Villenave d'Ornon Cedex, France

^* Corresponding author.

ABSTRACT

The nucleotide sequence of the 16S rRNA gene of Mycoplasma flocculare was determined and was compared with the sequence of a related porcine mycoplasma, Mycoplasma hyopneumoniae. While the overall level of DNA-DNA homology was approximately 11%, sequence alignment of the two 16S rRNA genes yielded a homology value of more than 95%, emphasizing the highly conserved nature of the 16S rRNA gene. Multiple sequence alignments with other mollicutes indicated that M. flocculare, M. hyopneumoniae, and Mycoplasma hyorhinis form a subcluster within the fermentans phylogroup, and this subcluster is distinct from the Mycoplasma pneumoniae phylogroup. Thus, the three mycoplasmas isolated from porcine respiratory systems exhibit phylogenetic similarities.

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