1887

Abstract

Sequences of the gene encoding the -subunit of the RNA polymerase () were used to delineate the phylogeny of the family . A total of 72 strains, including the type strains of the major described species as well as selected field isolates, were included in the study. Selection of universal -derived primers for the family allowed straightforward amplification and sequencing of a 560 bp fragment of the gene. In parallel, 16S rDNA was sequenced from all strains. The phylogenetic tree obtained with the sequences reflected the major branches of the tree obtained with the 16S rDNA, especially at the genus level. Only a few discrepancies between the trees were observed. In certain cases the phylogeny was in better agreement with DNA–DNA hybridization studies than the phylogeny derived from 16S rDNA. The gene is strongly conserved within the various species of the family of . Hence, gene sequence analysis in conjunction with 16S rDNA sequencing is a valuable tool for phylogenetic studies of the and may also prove useful for reorganizing the current taxonomy of this bacterial family.

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2004-07-01
2024-12-12
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