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Int J Syst Evol Microbiol 57 (2007), 2314-2319; DOI  10.1099/ijs.0.64883-0
© 2007 International Union of Microbiological Societies

Acidaminococcus intestini sp. nov., isolated from human clinical samples

Estelle Jumas-Bilak1, Jean-Philippe Carlier2, Hélène Jean-Pierre3, Francine Mory4, Corinne Teyssier1, Bernard Gay3, Josiane Campos3 and Hélène Marchandin3

1 Université Montpellier 1, Faculté de Pharmacie, Laboratoire de Bactériologie-Virologie, 15 Avenue Charles Flahault, BP 14491, 34060 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 et Universitaire de Montpellier, Hôpital Arnaud de Villeneuve, Laboratoire de Bactériologie, 371 Avenue du Doyen Gaston Giraud, 34295 Montpellier Cedex 5, France
4 Centre Hospitalier et Universitaire de Nancy, Hôpital Central, Laboratoire de Bactériologie, 29 avenue du Maréchal de Lattre de Tassigny, 54035 Nancy Cedex, France

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

Eleven strains of a hitherto unknown, Gram-negative, anaerobic coccus were recovered from various human clinical samples of patients hospitalized in two geographically distant French hospitals. These strains displayed the morphology and growth characteristics of those related to the genus Acidaminococcus. The clinical isolates shared at least 99.9 and 99.7 % of their nucleotide positions in the 16S and 23S rRNA gene sequences, respectively. They displayed 95.6 and 88.9 % 16S and 23S rRNA gene sequence similarities, respectively, with Acidaminococcus fermentans. The 16S rRNA-based phylogeny revealed that all the clinical isolates grouped in a statistically well supported cluster separate from A. fermentans. Enzymic activity profiles as well as metabolic end product patterns, including propionic acid production, differentiated the novel bacteria from A. fermentans. Finally, phenotypic, genotypic and phylogenetic data, including large-scale chromosome structure and DNA G+C content, supported the proposal of a novel species of the genus Acidaminococcus, for which the name Acidaminococcus intestini sp. nov. is proposed. The type strain is ADV 255.99T (=AIP 283.01T=CIP 108586T=CCUG 50930T).

Abbreviations: EM, electron microscopy; ML, maximum-likelihood; NJ, neighbour-joining

The GenBank/EMBL/DDBJ accession numbers for the 16S and 23S rRNA gene sequences of strain ADV 255.99T are AF473835 and EF060100, respectively.

PFGE migration of I-CeuI-restricted DNAs and EM of cells of strain ADV 255.99T are available as supplementary figures with the online version of this paper.






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