A1 Journal article (refereed)
Vertical stratification patterns of methanotrophs and their genetic controllers in water columns of oxygen-stratified boreal lakes (2021)
Rissanen, A. J., Saarela, T., Jäntti, H., Buck, M., Peura, S., Aalto, S. L., Ojala, A., Pumpanen, J., Tiirola, M., Elvert, M., & Nykänen, H. (2021). Vertical stratification patterns of methanotrophs and their genetic controllers in water columns of oxygen-stratified boreal lakes. Fems Microbiology Ecology, 97(2), Article fiaa252. https://doi.org/10.1093/femsec/fiaa252
JYU authors or editors
Publication details
All authors or editors: Rissanen, Antti J.; Saarela, Taija; Jäntti, Helena; Buck, Moritz; Peura, Sari; Aalto, Sanni L.; Ojala, Anne; Pumpanen, Jukka; Tiirola, Marja; Elvert, Marcus; et al.
Journal or series: Fems Microbiology Ecology
ISSN: 0168-6496
eISSN: 1574-6941
Publication year: 2021
Volume: 97
Issue number: 2
Article number: fiaa252
Publisher: Oxford University Press
Publication country: United Kingdom
Publication language: English
DOI: https://doi.org/10.1093/femsec/fiaa252
Publication open access: Openly available
Publication channel open access: Partially open access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/74055
Abstract
The vertical structuring of methanotrophic communities and its genetic controllers remain understudied in the water columns of oxygen-stratified lakes. Therefore, we used 16S rRNA gene sequencing to study the vertical stratification patterns of methanotrophs in two boreal lakes, Lake Kuivajärvi and Lake Lovojärvi. Furthermore, metagenomic analyses were done to assess the genomic characteristics of methanotrophs in Lovojärvi and a previously studied Lake Alinen Mustajärvi. The methanotroph communities were vertically structured along the oxygen gradient. Alphaproteobacterial methanotrophs preferred oxic water layers, while Methylococcales methanotrophs, consisting of putative novel genera and species, thrived especially at and below the oxic-anoxic interface and showed distinct depth variation patterns, which were not completely predictable by their taxonomic classification. Instead, genomic differences among Methylococcales methanotrophs explained their variable vertical depth patterns. Genes in COG categories L (Replication, recombination and repair) and S (Function unknown) were relatively high in metagenome-assembled-genomes representing Methylococcales thriving clearly below the oxic-anoxic interface, suggesting genetic adaptations for increased stress tolerance enabling living in the hypoxic/anoxic conditions. In contrast, genes in COG category N (Cell motility) were relatively high in metagenome-assembled-genomes of Methylococcales thriving at the oxic-anoxic interface, which suggests genetic adaptations for increased motility at the vertically fluctuating oxic-anoxic interface.
Keywords: lakes; microbiome; stratification; oxygen depletion; methane; genomics; RNA
Free keywords: methanotroph; Methylococcales; vertical structuring; 16S rRNA; metagenomics; genetic potential
Contributing organizations
Related projects
- Micro-RIP Functional analysis of uncultivated microbes using radioisotope probing
- Tiirola, Marja
- European Commission
Ministry reporting: Yes
Reporting Year: 2021
JUFO rating: 1