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Jonquetella anthropi gen. nov., sp. nov., the first member of the candidate phylum ‘Synergistetes’ isolated from man

¹ Université Montpellier 1, EA 3755, Faculté de Pharmacie, Laboratoire de Bactériologie-Virologie, 15, Avenue Charles Flahault, BP 14491, 34093 Montpellier Cedex 5, France
² Institut Pasteur, Centre National de Référence des Bactéries Anaérobies et du Botulisme, 25 rue du Dr Roux, 75724 Paris Cedex 15, France
³ Centre Hospitalier Universitaire de Montpellier, Hôpital Arnaud de Villeneuve, Laboratoire de Bactériologie, 371 Avenue du Doyen Gaston Giraud, 34295 Montpellier Cedex 5, France
⁴ R. M. Alden Research Laboratory, Santa Monica Blvd, Santa Monica, CA 90404, USA
⁵ National Microbiology Laboratory – Public Health Agency of Canada, 1015 Arlington St., Suite H5040, Winnipeg, MB R3E 3R2, Canada

Correspondence
Hélène Marchandin
h-marchandin{at}chu-montpellier.fr

Six clinical isolates of a hitherto unknown, strictly anaerobic, Gram-negative rod showing fastidious growth were subjected to a polyphasic taxonomic study, including phenotypic, genomic and phylogenetic feature analyses. 16S rRNA gene sequenced-based phylogeny revealed that the novel strains represent a homogeneous group distant from any recognized species in the candidate phylum ‘Synergistetes’. The novel isolates were most closely related to species of the genus Dethiosulfovibrio, with 88.2–88.7 % 16S rRNA gene sequence similarity. Large-scale chromosome structure and DNA G+C content also differentiated the novel strains from members of the genus Dethiosulfovibrio. The novel strains were asaccharolytic. Major metabolic end products in trypticase/glucose/yeast extract broth were acetic, lactic, succinic and isovaleric acids and the major cellular fatty acids iso-C_{15 : 0} and C_{16 : 0}. Based on the data presented here, a new genus, Jonquetella gen. nov., is proposed with one novel species, Jonquetella anthropi sp. nov. J. anthropi is the first characterized species of the candidate phylum ‘Synergistetes’ that includes human isolates. The G+C content of the DNA of the type strain of J. anthropi ADV 126^T (=AIP 136.05^T=CIP 109408^T=CCUG 53819^T) is 59.4 mol%.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Jonquetella anthropi ADV 126^T is EF436500.

A supplementary figure showing the PFGE analysis of strains of Jonquetella anthropi gen. nov., sp. nov. is available with the online version of this paper.

This work was presented in part at the 8th Congress of the Anaerobe Society of the Americas, Boise, Idaho, USA, July 2006.

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