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Reconstructing a hydrogen-driven microbial metabolic network in Opalinus Clay rock
KTH, Centres, Science for Life Laboratory, SciLifeLab.
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2016 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 7, 12770Article in journal (Refereed) Published
Abstract [en]

The Opalinus Clay formation will host geological nuclear waste repositories in Switzerland. It is expected that gas pressure will build-up due to hydrogen production from steel corrosion, jeopardizing the integrity of the engineered barriers. In an in situ experiment located in the Mont Terri Underground Rock Laboratory, we demonstrate that hydrogen is consumed by microorganisms, fuelling a microbial community. Metagenomic binning and metaproteomic analysis of this deep subsurface community reveals a carbon cycle driven by autotrophic hydrogen oxidizers belonging to novel genera. Necromass is then processed by fermenters, followed by complete oxidation to carbon dioxide by heterotrophic sulfate-reducing bacteria, which closes the cycle. This microbial metabolic web can be integrated in the design of geological repositories to reduce pressure build-up. This study shows that Opalinus Clay harbours the potential for chemolithoautotrophic-based system, and provides a model of microbial carbon cycle in deep subsurface environments where hydrogen and sulfate are present.

Place, publisher, year, edition, pages
Nature Publishing Group, 2016. Vol. 7, 12770
National Category
Geology
Identifiers
URN: urn:nbn:se:kth:diva-196394DOI: 10.1038/ncomms12770ISI: 000385545700001ScopusID: 2-s2.0-84991711094OAI: oai:DiVA.org:kth-196394DiVA: diva2:1050255
Funder
Swedish Research Council, 2011-5689
Note

QC 20161128

Available from: 2016-11-28 Created: 2016-11-14 Last updated: 2016-11-28Bibliographically approved

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CiteExportLink to record
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Citation style
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