期刊
FRONTIERS IN MICROBIOLOGY
卷 11, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2020.01848
关键词
Bacteria; Archaea; evolution; genomics fermentation; respiration; oxidoreductases
类别
资金
- USA National Science Foundation [OCE-0452333, OCE-1136727, 1441717, 1826734, 1335810, 1460861]
- Simons Foundation [510023]
- U.S. Department of Energy Joint Genome Institute, a DOE Office of Science User Facility [DE-AC02-05CH11231]
- Russian Science Foundation [19-1400245]
- NASA Exobiology grant [80NSSC17K0548]
- Russian Science Foundation [19-14-00245] Funding Source: Russian Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1460861] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [1335810] Funding Source: National Science Foundation
- Office Of The Director
- Office of Integrative Activities [1826734] Funding Source: National Science Foundation
Recent discoveries suggest that the candidate superphyla Patescibacteria and DPANN constitute a large fraction of the phylogenetic diversity of Bacteria and Archaea. Their small genomes and limited coding potential have been hypothesized to be ancestral adaptations to obligate symbiotic lifestyles. To test this hypothesis, we performed cell-cell association, genomic, and phylogenetic analyses on 4,829 individual cells of Bacteria and Archaea from 46 globally distributed surface and subsurface field samples. This confirmed the ubiquity and abundance of Patescibacteria and DPANN in subsurface environments, the small size of their genomes and cells, and the divergence of their gene content from other Bacteria and Archaea. Our analyses suggest that most Patescibacteria and DPANN in the studied subsurface environments do not form specific physical associations with other microorganisms. These data also suggest that their unusual genomic features and prevalent auxotrophies may be a result of ancestral, minimal cellular energy transduction mechanisms that lack respiration, thus relying solely on fermentation for energy conservation.
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