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1 Alimentary Pharmabiotic Centre and Department of Microbiology, Bioscience Institute, National University of Ireland, Western Road, Cork, Ireland
2 Department of Genetics, Anthropology and Evolution, University of Parma, Parco Area delle Scienze 11a, 43100 Parma, Italy
3 Dipartimento Scientifico e Tecnologico, University of Verona, Italy
Correspondence
Marco Ventura
marco.ventura{at}unipr.it
Bifidobacteria represent one of the most numerous groups of bacteria found in the gastrointestinal tract of humans and animals. In man, gastrointestinal bifidobacteria are associated with health effects and for this reason they are often used as functional ingredients in food and pharmaceutical products. Such applications may benefit from or require a clear and reliable bifidobacterial species identification. The increasing number of available bacterial genome sequences has provided a large amount of housekeeping gene sequences that can be used both for identification of bifidobacterial species as well as for understanding bifidobacterial evolution. In order to assess their relative positions in the evolutionary process, fragments from seven conserved genes, clpC, dnaB, dnaG, dnaJ1, purF, rpoC and xfp, were sequenced from each of the currently described type strains of the genus Bifidobacterium. The results demonstrate that the concatenation of these seven gene sequences for phylogenetic purposes allows a significant increase in the discriminatory power between taxa.
The GenBank/EMBL/DDBJ accession numbers for the partial 16S rRNA, clpC, dnaB, dnaG, dnaJ1, purF, rpoC and xfp gene sequences generated in this study are shown in the phylogenetic trees in Supplementary Figs S1–S8.
Additional phylogenetic trees of the genus Bifidobacterium generated using clpC, dnaJ1, rpoC, purF, dnaB, dnaG, xfp and groEL gene sequences are available as supplementary figures in IJSEM Online.
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