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Dialister succinatiphilus sp. nov. and Barnesiella intestinihominis sp. nov., isolated from human faeces

Yakult Central Institute for Microbiological Research, 1796 Yaho, Kunitachi, 186-8650 Tokyo, Japan

Correspondence
Masami Morotomi
masami-morotomi{at}yakult.co.jp

Two anaerobic, non-spore-forming, bacteria (YIT 11850^T and YIT 11860^T) that stained Gram-negative, were isolated from human faeces. Cells of strain YIT 11850^T were coccobacilli, asaccharolytic and largely unreactive, with only traces of lactate and propionate as metabolic end products; however, strain YIT 11850^T was able to decarboxylate succinate to propionate. The DNA G+C content of strain YIT 11850^T was 51.9 mol%. Following 16S rRNA gene sequence analysis, this strain was found to be most closely related to Dialister propionicifaciens, with 95.1 % sequence similarity between the two taxa. Biochemical data supported the affiliation of strain YIT 11850^T to the genus Dialister. Strain YIT 11850^T therefore represents a novel species for which the name Dialister succinatiphilus sp. nov. is proposed; the type strain is YIT 11850^T (=DSM 21274^T=JCM 15077^T). Cells of the other isolate, strain YIT 11860^T, were non-motile, rod-shaped, positive for aesculin hydrolysis, negative for indole production, produced succinic and acetic acids as end products of glucose metabolism and possessed a DNA G+C content of 45.5 mol%. On the basis of 16S rRNA gene sequence similarity values, this strain was shown to belong to the family ‘Porphyromonadaceae’ related to Barnesiella viscericola (96.0 %); similarity values with species within the family ‘Porphyromonadaceae’ with validly published names were less than 86 %. Biochemical data supported the affiliation of strain YIT 11860^T to the genus Barnesiella. Strain YIT 11860^T therefore represents a novel species for which the name Barnesiella intestinihominis sp. nov. is proposed; the type strain is YIT 11860^T (=DSM 21032^T=JCM 15079^T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains YIT 11850^T and YIT 11860^T are AB370249 and AB370251, respectively.

16S rRNA gene sequence similarity values between Dialister succinatiphilus sp. nov. and other members of the genus Dialister are available with the online version of this paper.

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