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Updated: Aug 11, 2025
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Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems
Published on: August 23, 2019
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Bacteroides faecium sp. nov. isolated from human faeces.
Juseok Kim1,2, Hye Seon Song1, Joon Yong Kim1
1Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju 61755, Republic of Korea.
International Journal of Systematic and Evolutionary Microbiology
|February 7, 2023
Summary
A new bacterium, Bacteroides faecium, was discovered in human feces. This strictly anaerobic, Gram-negative bacterium expands the known diversity within the Bacteroides genus.
Area of Science:
- Microbiology
- Bacteriology
- Genomics
Background:
- The human gut microbiome plays a crucial role in health and disease.
- The genus *Bacteroides* comprises key anaerobic bacteria found in the gut.
- Accurate taxonomic classification is essential for understanding microbial roles.
Purpose of the Study:
- To characterize a novel bacterial isolate from human feces.
- To determine the phylogenetic and genomic features of the new strain.
- To formally propose a new species within the *Bacteroides* genus.
Main Methods:
- Polyphasic taxonomic analysis, including 16S rRNA gene sequencing.
- Phylogenetic analysis to determine evolutionary relationships.
- Genomic analysis (genome size, DNA G+C content) and phenotypic characterization (morphology, growth conditions, biochemical properties).
Main Results:
- A novel strain, CBA7301T, was isolated from human feces.
- Phylogenetic analysis placed CBA7301T within the *Bacteroides* genus, with 96.2% 16S rRNA gene sequence similarity to *Bacteroides faecichinchillae*.
- Genomic and phenotypic data supported its classification as a new species, *Bacteroides faecium* sp. nov., with specific characteristics including Gram-negative, rod-shaped cells, optimal growth at 30-35°C, and menaquinone 10 as the respiratory quinone.
Conclusions:
- CBA7301T represents a novel species, *Bacteroides faecium*, within the *Bacteroidaceae* family.
- This finding contributes to the understanding of bacterial diversity in the human gut.
- The detailed characterization provides a basis for future research on the ecological role of *Bacteroides faecium*.
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