Title |
Pan-genomic analysis to redefine species and subspecies based on quantum discontinuous variation: the Klebsiella paradigm
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Published in |
Biology Direct, September 2015
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DOI | 10.1186/s13062-015-0085-2 |
Pubmed ID | |
Authors |
Aurélia Caputo, Vicky Merhej, Kalliopi Georgiades, Pierre-Edouard Fournier, Olivier Croce, Catherine Robert, Didier Raoult |
Abstract |
Various methods are currently used to define species and are based on the phylogenetic marker 16S ribosomal RNA gene sequence, DNA-DNA hybridization and DNA GC content. However, these are restricted genetic tools and showed significant limitations. In this work, we describe an alternative method to build taxonomy by analyzing the pan-genome composition of different species of the Klebsiella genus. Klebsiella species are Gram-negative bacilli belonging to the large Enterobacteriaceae family. Interestingly, when comparing the core/pan-genome ratio; we found a clear discontinuous variation that can define a new species. Using this pan-genomic approach, we showed that Klebsiella pneumoniae subsp. ozaenae and Klebsiella pneumoniae subsp. rhinoscleromatis are species of the Klebsiella genus, rather than subspecies of Klebsiella pneumoniae. This pan-genomic analysis, helped to develop a new tool for defining species introducing a quantic perspective for taxonomy. This article was reviewed by William Martin, Pierre Pontarotti and Pere Puigbo (nominated by Dr Yuri Wolf). |
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