New viral biogeochemical roles revealed through metagenomic analysis of Lake Baikal

A groundbreaking metagenomic analysis of Lake Baikal, the world's largest freshwater lake, reveals previously unknown viral roles in biogeochemical cycles. Researchers identified 19,475 viral sequences, uncovering bacteriophages that infect key microbial taxa like Nitrospirota and Methylophilaceae, with auxiliary metabolic genes potentially enhancing carbon fixation via the reductive TCA cycle and methanol oxidation pathways. Significant shifts in viral community composition were observed between epipelagic and bathypelagic zones, suggesting depth- and season-dependent viral dynamics. This study highlights the profound influence of viruses on freshwater ecosystems, particularly their role in dark carbon fixation and methylotrophy, offering new insights into microbial-driven biogeochemical processes.

Coutinho, F. H., Cabello-Yeves, P. J., Gonzalez-Serrano, R., Rosselli, R., López-Pérez, M., Zemskaya, T. I., Zakharenko, A. S., Ivanov, V. G., & Rodriguez-Valera, F. (2020). New viral biogeochemical roles revealed through metagenomic analysis of Lake Baikal. Microbiome, 8(1). https://doi.org/10.1186/s40168-020-00936-4