Hydrogenimesophilus fermentans gen. nov., sp. nov., a novel anaerobic hydrogen-producing bacterium isolated from lacustrine sediment
Abstract
Anaerobic lake sediments harbour fermentative micro-organisms that contribute to organic-matter degradation and dihydrogen (H 2 ) turnover. Strain PP1C4 T was isolated from sediment of Lake Pavin, a permanently stratified meromictic lake characterized by active anaerobic microbial processes, including methanogenesis and characterized using a polyphasic taxonomic approach. Cells were strictly anaerobic, Gram-stain-negative, motile rods. Growth occurred at 19–37 °C (optimum, 30 °C), pH 7.0–9.0 (optimum, pH 7.0) and NaCl concentrations of 0–20 g l⁻¹ (optimum, 1 g l −1 ). Glucose fermentation produced propionate and butyrate as major organic end-products together with CO ₂ and H 2 . Phylogenetic analysis placed PP1C4 T within the family Oscillospiraceae , with the highest 16S rRNA gene sequence similarity to ‘ Marasmitruncus massiliensis ’ Marseille-P3646 (95.2%). The genome was ∼3.4 Mb with a DNA G+C content of 45.6 mol%. Maximum blast -based average nucleotide identity and average amino acid identity values between PP1C4 T and the compared taxa were 71.53 and 69.30%, respectively, and in silico DNA–DNA hybridization values ranged from 18.0 to 24.3%. Based on the combined phylogenetic, genomic, phenotypic and chemotaxonomic evidence, strain PP1C4ᵀ represents a novel genus and species within the family Oscillospiraceae , for which the name Hydrogenimesophilus fermentans gen. nov., sp. nov. is proposed. The type strain is PP1C4 T (=DSM 118145 T =CIP 112512ᵀ).
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BibTeX
@article{fadhlaoui2026hydrogenimesophilus,
title = {{Hydrogenimesophilus fermentans gen. nov., sp. nov., a novel anaerobic hydrogen-producing bacterium isolated from lacustrine sediment}},
author = {Khaled Fadhlaoui and Ayité Adama Hondegla and Gaëlle Marchal and Eric Viollier and Neha Mehta and Jean-Sébastien Guez and Mailysia Scheepers and Damien Courtine and Corinne Biderre-Petit},
journal = {International Journal of Systematic and Evolutionary Microbiology},
year = {2026},
month = oct,
doi = {10.1099/ijsem.0.007304},
url = {https://hal.science/hal-05783088v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Hydrogenimesophilus fermentans gen. nov., sp. nov., a novel anaerobic hydrogen-producing bacterium isolated from lacustrine sediment
AU - Khaled Fadhlaoui
AU - Ayité Adama Hondegla
AU - Gaëlle Marchal
AU - Eric Viollier
AU - Neha Mehta
AU - Jean-Sébastien Guez
AU - Mailysia Scheepers
AU - Damien Courtine
AU - Corinne Biderre-Petit
PY - 2026
DA - 2026/10/07
JO - International Journal of Systematic and Evolutionary Microbiology
DO - 10.1099/ijsem.0.007304
UR - https://hal.science/hal-05783088v1
AB - Anaerobic lake sediments harbour fermentative micro-organisms that contribute to organic-matter degradation and dihydrogen (H 2 ) turnover. Strain PP1C4 T was isolated from sediment of Lake Pavin, a permanently stratified meromictic lake characterized by active anaerobic microbial processes, including methanogenesis and characterized using a polyphasic taxonomic approach. Cells were strictly anaerobic, Gram-stain-negative, motile rods. Growth occurred at 19–37 °C (optimum, 30 °C), pH 7.0–9.0 (optimum, pH 7.0) and NaCl concentrations of 0–20 g l⁻¹ (optimum, 1 g l −1 ). Glucose fermentation produced propionate and butyrate as major organic end-products together with CO ₂ and H 2 . Phylogenetic analysis placed PP1C4 T within the family Oscillospiraceae , with the highest 16S rRNA gene sequence similarity to ‘ Marasmitruncus massiliensis ’ Marseille-P3646 (95.2%). The genome was ∼3.4 Mb with a DNA G+C content of 45.6 mol%. Maximum blast -based average nucleotide identity and average amino acid identity values between PP1C4 T and the compared taxa were 71.53 and 69.30%, respectively, and in silico DNA–DNA hybridization values ranged from 18.0 to 24.3%. Based on the combined phylogenetic, genomic, phenotypic and chemotaxonomic evidence, strain PP1C4ᵀ represents a novel genus and species within the family Oscillospiraceae , for which the name Hydrogenimesophilus fermentans gen. nov., sp. nov. is proposed. The type strain is PP1C4 T (=DSM 118145 T =CIP 112512ᵀ).
SN - 1466-5026
SN - 1466-5034
ER -