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Title: Occurrence and expression of novel methyl-coenzyme M reductase gene (mcrA) variants in hot spring sediments

Journal Article · · Scientific Reports
 [1];  [2];  [3];  [4]
  1. Montana State Univ., Bozeman, MT (United States). Center for Biofilm Engineering; Montana State Univ., Bozeman, MT (United States). Dept. of Land Resources and Environmental Sciences; DOE/OSTI
  2. Montana State Univ., Bozeman, MT (United States). Center for Biofilm Engineering; Montana State Univ., Bozeman, MT (United States). Dept. of Chemistry and Biochemistry
  3. Montana State Univ., Bozeman, MT (United States). Dept. of Land Resources and Environmental Sciences
  4. Montana State Univ., Bozeman, MT (United States). Center for Biofilm Engineering; Montana State Univ., Bozeman, MT (United States). Dept. of Microbiology and Immunology

Recent discoveries have shown that the marker gene for anaerobic methane cycling (mcrA) is more widespread in the Archaea than previously thought. However, it remains unclear whether novel mcrA genes associated with the Bathyarchaeota and Verstraetearchaeota are distributed across diverse environments. We examined two geochemically divergent but putatively methanogenic regions of Yellowstone National Park to investigate whether deeply-rooted archaea possess and express novel mcrA genes in situ. Small-subunit (SSU) rRNA gene analyses indicated that Bathyarchaeota were predominant in seven of ten sediment layers, while the Verstraetearchaeota and Euryarchaeota occurred in lower relative abundance. Targeted amplification of novel mcrA genes suggested that diverse taxa contribute to alkane cycling in geothermal environments. Two deeply-branching mcrA clades related to Bathyarchaeota were identified, while highly abundant verstraetearchaeotal mcrA sequences were also recovered. In addition, detection of SSU rRNA and mcrA transcripts from one hot spring suggested that predominant Bathyarchaeota were also active, and that methane cycling genes are expressed by the Euryarchaeota, Verstraetearchaeota, and an unknown lineage basal to the Bathyarchaeota. These findings greatly expand the diversity of the key marker gene for anaerobic alkane cycling and outline the need for greater understanding of the functional capacity and phylogenetic affiliation of novel mcrA variants.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1624317
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 7; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Wide diversity of methane and short-chain alkane metabolisms in uncultured archaea journal March 2019
Microbial Community Structure and Methane Cycling Potential along a Thermokarst Pond-Peatland Continuum journal October 2019
Trophic strategy of diverse methanogens across a river-to-sea gradient journal May 2019
Divergent methyl-coenzyme M reductase genes in a deep-subseafloor Archaeoglobi journal January 2019
Co-occurring genomic capacity for anaerobic methane and dissimilatory sulfur metabolisms discovered in the Korarchaeota journal March 2019
Wide diversity of methane and short-chain alkane metabolisms in uncultured archaea journal March 2019
An evolving view of methane metabolism in the Archaea journal January 2019
Methylotrophic methanogens everywhere — physiology and ecology of novel players in global methane cycling journal December 2019
Characterization of Bathyarchaeota genomes assembled from metagenomes of biofilms residing in mesophilic and thermophilic biogas reactors journal June 2018
Microbial Community Structure and Methane Cycling Potential along a Thermokarst Pond-Peatland Continuum journal October 2019

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