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Anaerotruncus Colihominis Gen. Nov., Sp. Nov., From Human Faeces

Paul A. Lawson, Yuli Song, Chengxu Liu, Denise R. Molitoris, Marja-Liisa Vaisanen, Matthew D. Collins, Sydney M. Finegold

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Phenotypic and phylogenetic studies were performed on two isolates of an unidentified Gram-positive, anaerobic, non-spore-forming, rod-shaped bacterium that was isolated from human faeces. The organisms were catalase-negative, produced acetic and butyric acids as end products of metabolism and possessed a DNA G+C content of approximately 54 mol%. Comparative 16S rRNA gene sequencing demonstrated that the two isolates were related closely to each other and formed a hitherto unknown sublineage within the Clostridium leptum rRNA cluster of organisms. Based on phylogenetic and phenotypic evidence, it is proposed that the unknown bacterium should be classified in a novel genus as Anaerotruncus colihominis gen. nov., sp. nov. The type strain of Anaerotruncus colihominis is WAL 14565T=CCUG 45055T=CIP 107754T.