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Faecalibacterium langellae sp. nov. isolated from human faeces
Adeline Ang Li Xuan1, Véronique Robert2, Atsushi Hisatomi3
1Department of Nutritional Science and Food Safety, Faculty of Applied Bioscience, Tokyo University of Agriculture, Tokyo, Japan.
Summary
Two gut bacteria strains were analyzed taxonomically. One strain is identified as Faecalibacterium taiwanense, while the other represents a new species, Faecalibacterium langellae.
Area of Science:
- Microbiology
- Gut Microbiome Research
- Bacterial Taxonomy
Background:
- The genus *Faecalibacterium* comprises key butyrate-producing bacteria in the human gut.
- These bacteria are considered potential biomarkers for a healthy gut microbiota due to beneficial metabolite production and reduced abundance in disease.
Purpose of the Study:
- To perform a taxonomic analysis of two *Faecalibacterium* strains, CNCM I-4540 and CNCM I-4541.
- To determine the precise classification of these strains within the *Faecalibacterium* genus.
Main Methods:
- Phylogenetic analyses using 16S rRNA and *rpoA* gene sequences.
- Core gene phylogenetic tree construction.
- Average Nucleotide Identity (ANI) and digital DNA-DNA hybridization (dDDH) calculations.
Main Results:
- Phylogenetic analyses confirmed both strains belong to the genus *Faecalibacterium*.
- Strain CNCM I-4540 was identified as *Faecalibacterium taiwanense* based on ANI (96.7%) and dDDH (74.3%) values compared to *F. taiwanense* HLW78T.
- Strain CNCM I-4541 did not meet the criteria for any known *Faecalibacterium* species, indicating it represents a novel species.
Conclusions:
- Strain CNCM I-4540 is taxonomically classified as *Faecalibacterium taiwanense*.
- Strain CNCM I-4541 is proposed as a novel species, *Faecalibacterium langellae* sp. nov. (type strain CNCM I-4541T).
- This study refines the taxonomy within the important *Faecalibacterium* genus.
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