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A ubiquitous gammaproteobacterial clade dominates expression of sulfur oxidation genes across the mesopelagic ocean
Baltar, F.; Martínez-Pérez, C.; Amano, C.; Vial, M.; Robaina-Estévez, S.; Reinthaler, T.; Herndl, G.; Zhao, Z.; Logares, R.; Morales, S.E.; González, J.M. (2023). A ubiquitous gammaproteobacterial clade dominates expression of sulfur oxidation genes across the mesopelagic ocean. Nature Microbiology 8(6): 1137-1148. https://dx.doi.org/10.1038/s41564-023-01374-2
In: Nature Microbiology. Springer Nature: London. ISSN 2058-5276
Peer reviewed article  
Beschikbaar in  Auteurs 
Author keywords
    Biogeochemistry; Microbial biooceanography; Microbial ecology
Auteurs  Top 
  • Baltar, F.
  • Martínez-Pérez, C.
  • Amano, C.
  • Vial, M.
  • Robaina-Estévez, S.
  • Reinthaler, T.
  • Herndl, G.
  • Zhao, Z.
  • Logares, R.
  • Morales, S.E.
  • González, J.M.
Abstract
    The deep ocean (>200 m depth) is the largest habitat on Earth. Recent evidence suggests sulfur oxidation could be a major energy source for deep ocean microbes. However, the global relevance and the identity of the major players in sulfur oxidation in the oxygenated deep-water column remain elusive. Here we combined single-cell genomics, community metagenomics, metatranscriptomics and single-cell activity measurements on samples collected beneath the Ross Ice Shelf in Antarctica to characterize a ubiquitous mixotrophic bacterial group (UBA868) that dominates expression of RuBisCO genes and of key sulfur oxidation genes. Further analyses of the gene libraries from the ‘Tara Oceans’ and ‘Malaspina’ expeditions confirmed the ubiquitous distribution and global relevance of this enigmatic group in the expression of sulfur oxidation and dissolved inorganic carbon fixation genes across the global mesopelagic ocean. Our study also underscores the unrecognized importance of mixotrophic microbes in the biogeochemical cycles of the deep ocean.
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