1887

Abstract

The evolution and taxonomy of strains isolated in Italy and Finland were studied by phylogenetic analysis of different genes, comparative analysis of small rRNA gene intervening sequence (IVS), amplified fragment length polymorphism analysis and DNA–DNA hybridization. The results of this study divided the strains into two distinct and divergent genomic groups. In the absence of a specific phenotype or pathotype to distinguish these groups, however, they may be referred to as two genomospecies: and sp. FL56. The phylogenetic network of and gene sequences, as well as the comparative analysis of small rRNA gene IVS, suggests independent evolution of the two genomospecies. In particular, sp. FL56 seems to be the result of adaptation of an ancestral strain in a new host. The phenomenon of adaptation to different hosts, or different intestinal niches in the same host, associated with high mutation and recombination rates could explain the evolution and the complex taxonomy of the genus . A comprehensive phylogenomics study of this genus would be useful to properly investigate this hypothesis.

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2010-10-01
2024-11-11
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