Abstract—
This is the first report on the application of metagenomic analysis of the microbiome of Lake Baikal bottom sediments in order to assess the community structure and metabolic potential of the microorganisms inhabiting the upper sediment horizon at the site of a deep-water station. Compared to the metagenome of near-bottom water, relative abundance of the phyla Methylomirabilota, Chloroflexota, and Acidobacterota was found to increase, as well as that of the genes for the pathways of methane, sulfur, and thiosulfate oxidation and of nitrate reduction. Genomes of members of 12 phyla forming the basis of the studied microbiome were assembled. Reconstruction of the metabolic pathways indicated the possible coexistence of microorganisms capable of gaining carbon and energy due to oxidation of carbohydrates, methane, thiosulfate, and ammonia, as well as via anaerobic processes of fermentation, denitrification, and (to a lesser degree) sulfate reduction.
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ACKNOWLEDGMENTS
The authors are grateful to A.V. Khabuev and O.M. Khlystov (Laboratory of Lake Baikal Geology, Limnological Institute, Siberian Branch, Russian Academy of Sciences) and to the crew of RV G.Yu. Vereshchagin for their help in collecting the sediment samples. The authors are also grateful to Jose Manuel Haro-Moreno (Miguel Hernandez University of Elche), for valuable consultations on metagenome analysis. Resource-consuming operations were carried out using the Akademik V.M. Matrosov high-productivity cluster, Irkutsk Supercomputer Center, Siberian Branch, Russian Academy of Sciences.
Funding
The work was supported by the Russian Science Foundation, project no. 22-14-00084.
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Bukin, S.V., Lomakina, A.V., Rusanov, I.I. et al. Structure and Metabolic Potential of the Microbiome of Lake Baikal Upper Sediment Layers Determined by Metagenome Analysis. Microbiology 92 (Suppl 1), S56–S62 (2023). https://doi.org/10.1134/S0026261723603743
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DOI: https://doi.org/10.1134/S0026261723603743