Multilocus analysis reveals diversity in the genus Tissierella: Description of Tissierella carlieri sp. nov. in the new class Tissierellia classis nov

The genus Tissierella and its relatives Tepidimicrobium, Soehngenia and Sporanaerobacter comprise anaerobic Gram-positive bacilli classified along with Gram-positive cocci in a family with controversial placement designated as incertae sedis XI, in the phylum Firmicutes. We performed a top-down reap...

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Bibliographic Details
Published in:Systematic and applied microbiology 2014-02, Vol.37 (1), p.23-34
Main Authors: Alauzet, Corentine, Marchandin, Hélène, Courtin, Pascal, Mory, Francine, Lemée, Ludovic, Pons, Jean-Louis, Chapot-Chartier, Marie-Pierre, Lozniewski, Alain, Jumas-Bilak, Estelle
Format: Article
Language:English
Subjects:
Bacterial Proteins - genetics
Cluster Analysis
Diversity
DNA, Bacterial - chemistry
DNA, Bacterial - genetics
DNA, Ribosomal - chemistry
DNA, Ribosomal - genetics
Genetic Variation
Gram-Positive Bacteria - classification
Gram-Positive Bacteria - genetics
Life Sciences
MLSA
Molecular Sequence Data
Multilocus Sequence Typing
Phylogeny
RNA, Ribosomal, 16S - genetics
Taxonomy
Tissierella
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Summary:The genus Tissierella and its relatives Tepidimicrobium, Soehngenia and Sporanaerobacter comprise anaerobic Gram-positive bacilli classified along with Gram-positive cocci in a family with controversial placement designated as incertae sedis XI, in the phylum Firmicutes. We performed a top-down reappraisal of the taxonomy from the phylum to the species level within the genus Tissierella. Reconstruction of high-rank 16S rRNA gene-based phylogenies and their interpretation in a taxonomic purpose allowed defining Tissierellia classis nov. within the phylum Firmicutes while the frames of Tissierellales ord. nov. and Tissierellaceae fam. nov. have to be further strengthened. For species delineation in the genus Tissierella, we studied a population of clinical strains. Beside Tissierella praeacuta, a sub-population of five strains formed a clade in multilocus phylogenies (16S rRNA, cpn60, tpi, recA and spo0A genes). Data such as 16S rRNA gene similarity level, population structure, chromosome organization and murein type indicated that this clade corresponded to a novel species for which the name Tissierella carlieri sp. nov. is proposed, with type strain LBN 295T=AIP 268.01T=DSM 23816T=CCUG 60010T. Such an approach, associating a phylogenetic reappraisal of high-level taxonomic ranks with weak taxonomic structure and a population study for genus and species delineation is needed to strengthen the taxonomic frame of incertae sedis groups in the phylum Firmicutes.
ISSN:0723-2020
1618-0984
DOI:10.1016/j.syapm.2013.09.007