Biogeography and environmental genomics of the Roseobacter-affiliated pelagic CHAB-I-5 lineage
| Autor: | Thorsten Brinkhoff, Anja Poehlein, Lone Gram, Bernd Wemheuer, Wade H. Jeffrey, Sara Billerbeck, Meinhard Simon, Sonja Voget, Helge-Ansgar Giebel, Rolf Daniel |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Microbiology (medical) Acclimatization Lineage (evolution) Immunology Applied Microbiology and Biotechnology Microbiology Genome 03 medical and health sciences Microbial ecology RNA Ribosomal 16S Genetics Seawater 14. Life underwater Phylogeny biology Ecology Gene Expression Profiling Glutamate Synthase Alphaproteobacteria Pelagic zone Cell Biology Bacterioplankton Roseobacter Cold Climate Plankton biology.organism_classification Phylogeography 030104 developmental biology 13. Climate action Metagenomics Evolutionary biology ATP-Binding Cassette Transporters North Sea Water Microbiology Genome Bacterial |
| Zdroj: | Nature Microbiology. 1 |
| ISSN: | 2058-5276 |
| DOI: | 10.1038/nmicrobiol.2016.63 |
| Popis: | The identification and functional characterization of microbial communities remains a prevailing topic in microbial oceanography as information on environmentally relevant pelagic prokaryotes is still limited. The Roseobacter group, an abundant lineage of marine Alphaproteobacteria, can constitute large proportions of the bacterioplankton. Roseobacters also occur associated with eukaryotic organisms and possess streamlined as well as larger genomes from 2.2 to >5 Mpb. Here, we show that one pelagic cluster of this group, CHAB-I-5, occurs globally from tropical to polar regions and accounts for up to 22% of the active North Sea bacterioplankton in the summer. The first sequenced genome of a CHAB-I-5 organism comprises 3.6 Mbp and exhibits features of an oligotrophic lifestyle. In a metatranscriptome of North Sea surface waters, 98% of the encoded genes were present, and genes encoding various ABC transporters, glutamate synthase and CO oxidation were particularly upregulated. Phylogenetic gene content analyses of 41 genomes of the Roseobacter group revealed a unique cluster of pelagic organisms distinct from other lineages of this group, highlighting the adaptation to life in nutrient-depleted environments. Global sampling campaigns show that the CHAB-I-5 Roseobacter cluster is abundant in the marine environment, and found from the poles to the tropics. Analysis of the draft genome of strain SB2 reveals adaptation to an oligotrophic lifestyle. |
| Databáze: | OpenAIRE |
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