alexa Recognition of greater diversity of Bacillus species and related bacteria in human faeces.
Chemical Engineering

Chemical Engineering

Journal of Bioprocessing & Biotechniques

Author(s): Hoyles L, Honda H, Logan NA, Halket G, La Ragione RM,

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Abstract In a study looking at culturable aerobic Actinobacteria associated with the human gastrointestinal tract, the vast majority of isolates obtained from dried human faeces belonged to the genus Bacillus and related bacteria. A total of 124 isolates were recovered from the faeces of 10 healthy adult donors. 16S rRNA gene sequence analyses showed the majority belonged to the families Bacillaceae (n=81) and Paenibacillaceae (n=3), with Bacillus species isolated from all donors. Isolates tentatively identified as Bacillus clausii (n=32) and Bacillus licheniformis (n=28) were recovered most frequently, with the genera Lysinibacillus, Ureibacillus, Oceanobacillus, Ornithinibacillus and Virgibacillus represented in some donors. Phenotypic data confirmed the identities of isolates belonging to well-characterized species. Representatives of the phylum Actinobacteria were recovered in much lower numbers (n=11). Many of the bacilli exhibited antimicrobial activity against one or more strains of Clostridium difficile, Clostridium perfringens, Listeria monocytogenes and Staphylococcus aureus, with some (n=12) found to have no detectable cytopathic effect on HEp-2 cells. This study has revealed greater diversity within gut-associated aerobic spore-formers than previous studies, and suggests that bacilli with potential as probiotics could be isolated from the human gut. Copyright © 2011 Institut Pasteur. Published by Elsevier Masson SAS. All rights reserved. This article was published in Res Microbiol and referenced in Journal of Bioprocessing & Biotechniques

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