Abstract
Caecal samples from wild-type and TNFdeltaARE mice were cultured on selective media containing bile salts, amino acids or casein macro-peptides. Twenty-two strains were isolated and identified by 16S rRNA gene sequencing. Twenty-one strains showed >98% similarity to known bacteria (Blautia spp., Clostridium innocuum, Enterococcus spp., Escherichia coli, Lactobacillus murinus, Parabacteroides goldsteinii and Shigella dysenteriae). One additional isolate, strain A-C2-0, was a new bacterium. The closest relatives were Bacteroides massiliensis, Bacteroides dorei and Bacteroides vulgatus (≤94% similarity). Strain A-C2-0 is a Gram-negative rod that does not form spores and has a G + C content of DNA of 41.5%. Its major cellular fatty acid is C15:0 ANTEISO, and its major respiratory quinone is MK-9. Cells are aerotolerant but grow only under strict anoxic conditions. They are resistant to cefotaxime and tobramycin. When compared with related Bacteroides spp., the new bacterium was positive for α-arabinosidase, negative for glutamyl glutamic acid arylamidase and did not metabolise galactose, glucose, fructose, mannose, raffinose and sucrose. Strain A-C2-0 therefore merits recognition as a member of a novel species within the genus Bacteroides, for which the name Bacteroides sartorii is proposed. The type strain is A-C2-0T (= DSM 21941T = CCUG 57211T).
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Acknowledgments
The heterozygous TNFdeltaARE mouse model of ileitis was a generous gift from Dr. George Kollias (Biomedical Sciences Research Center Alexander Fleming, Vari, Greece). We thank Prof. J.P. Euzeby (Ecole Nationale Vétérinaire, Toulouse, France) for his support in creating Latin names, Dr. Sigrid Kisling (TUM, BFLM) for histological analysis, Dr. Herbert Seiler (TUM, Microbiology) for microscopic analysis and co-workers of the DSMZ and of the Culture Collection University of Göteborg (CCUG) for contributing to the description of strain A-C2-0.
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Communicated by Erko Stackebrandt.
The GenBank accession number for the 16S rRNA and gyrase B gene sequences of strain A-C2-0 is GQ456204 and GQ409831, respectively.
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Clavel, T., Saalfrank, A., Charrier, C. et al. Isolation of bacteria from mouse caecal samples and description of Bacteroides sartorii sp. nov. Arch Microbiol 192, 427–435 (2010). https://doi.org/10.1007/s00203-010-0568-6
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DOI: https://doi.org/10.1007/s00203-010-0568-6