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  Exploring the abundance, metabolic potential and gene expression of subseafloor Chloroflexi in million-year-old oxic and anoxic abyssal clay

Vuillemin, A., Kerrigan, Z., D'Hondt, S., Orsi, W. D. (2020): Exploring the abundance, metabolic potential and gene expression of subseafloor Chloroflexi in million-year-old oxic and anoxic abyssal clay. - FEMS Microbiology Ecology, 96, 12, fiaa223.
https://doi.org/10.1093/femsec/fiaa223

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5005789 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5005789_2
Genre: Journal Article

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 Creators:
Vuillemin, A.1, Author              
Kerrigan, Z.2, Author
D'Hondt, S.2, Author
Orsi, W. D. 2, Author
Affiliations:
10 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146023              
2External Organizations, ou_persistent22              

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Free keywords: abyssal clay, Chloroflexi, Dehalococcoidia, SAR202 clade, western North Atlantic Gyre, homoacetogenesis, metagenomes, metatranscriptomes
 Abstract: Chloroflexi are widespread in subsurface environments, and recent studies indicate that they represent a major fraction of the communities in subseafloor sediment. Here, we compare the abundance, diversity, metabolic potential and gene expression of Chloroflexi from three abyssal sediment cores from the western North Atlantic Gyre (water depth >5400 m) covering up to 15 million years of sediment deposition, where Chloroflexi were found to represent major components of the community at all sites. Chloroflexi communities die off in oxic red clay over 10–15 million years, and gene expression was below detection. In contrast, Chloroflexi abundance and gene expression at the anoxic abyssal clay site increase below the seafloor and peak in 2–3 million-year-old sediment, indicating a comparably higher activity. Metatranscriptomes from the anoxic site reveal increased expression of Chloroflexi genes involved in cell wall biogenesis, protein turnover, inorganic ion transport, defense mechanisms and prophages. Phylogenetic analysis shows that these Chloroflexi are closely related to homoacetogenic subseafloor clades and actively transcribe genes involved in sugar fermentations, gluconeogenesis and Wood–Ljungdahl pathway in the subseafloor. Concomitant expression of cell division genes indicates that these putative homoacetogenic Chloroflexi are actively growing in these million-year-old anoxic abyssal sediments.

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 Dates: 2020-11-052020
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1093/femsec/fiaa223
 Degree: -

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Title: FEMS Microbiology Ecology
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 96 (12) Sequence Number: fiaa223 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals144
Publisher: Oxford University Press