Blautia faecis sp. nov., isolated from human faeces

Area of Science:

• Microbiology
• Gut Microbiome Research
• Bacteriology

Background:

• The human gut microbiome plays a crucial role in health and disease.
• Characterizing novel bacterial species enhances our understanding of microbial ecology and function.
• The genus Blautia comprises anaerobic bacteria with known metabolic activities.

Purpose of the Study:

• To isolate and characterize a novel bacterium from human faecal samples.
• To determine the phylogenetic and genotypic relationship of the novel isolate to known species.
• To propose a new species within the genus Blautia.

Main Methods:

• Isolation of strictly anaerobic bacteria from human faeces.
• Phenotypic characterization including Gram staining, motility, and biochemical tests (catalase, oxidase).
• 16S rRNA gene sequencing for phylogenetic analysis and DNA G+C content determination.

Main Results:

• A novel, strictly anoxic, Gram-positive, non-motile bacterium, strain M25(T), was isolated.
• Strain M25(T) showed negative catalase and oxidase activity, fermented carbohydrates producing lactate and acetate.
• Phylogenetic analysis placed strain M25(T) within the genus Blautia, closely related to Blautia glucerasea and Ruminococcus obeum.

Conclusions:

• Strain M25(T) represents a novel species, Blautia faecis sp. nov., based on its unique phenotypic, genotypic, and phylogenetic characteristics.
• The discovery of Blautia faecis expands the known diversity of the Blautia genus.
• This finding contributes to the comprehensive cataloging of human gut bacteria and their potential roles.