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Bacteroides intestinalis sp. nov., isolated from human faeces.
Mohammad Abdul Bakir1, Maki Kitahara, Mitsuo Sakamoto
1Microbe Division/Japan Collection of Microorganisms, RIKEN BioResource Center, Wako, Saitama 351-0198, Japan. bakir@jcm.riken.jp
International Journal of Systematic and Evolutionary Microbiology
|January 13, 2006
Summary
Researchers discovered a new species of gut bacteria, Bacteroides intestinalis, isolated from human feces. This finding expands our understanding of the human gut microbiota and its diversity.
Area of Science:
- Microbiology
- Genomics
- Human Gut Microbiota
Background:
- The human gut microbiota plays a crucial role in health and disease.
- Bacteroides species are significant members of the gut microbial community.
- Isolation of novel bacterial species aids in understanding microbial diversity.
Purpose of the Study:
- To isolate and characterize novel bacterial strains from human faeces.
- To determine the taxonomic classification of newly isolated Gram-negative anaerobic rods.
- To propose a new species within the Bacteroides genus.
Main Methods:
- Isolation of bacterial strains using polyamine-deficient medium.
- Identification using 16S rRNA gene sequencing.
- Genomic and biochemical characterization including DNA G+C content and fatty acid analysis.
- DNA-DNA hybridization for taxonomic differentiation.
Main Results:
- Five strains of Gram-negative anaerobic rods were isolated.
- 16S rRNA gene sequencing indicated affiliation with the genus Bacteroides.
- Strain 341T showed <95% 16S rRNA gene sequence similarity to known species.
- DNA G+C content and fatty acid profiles supported Bacteroides classification.
- Biochemical tests and DNA-DNA hybridization confirmed strain 341T as distinct from related species.
Conclusions:
- A novel species, Bacteroides intestinalis sp. nov., is proposed.
- Strain 341T is designated as the type strain (JCM 13265T = DSM 17393T).
- This discovery contributes to the characterization of the human gut microbiome.