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Title: Critical biogeochemical functions in the subsurface are associated with bacteria from new phyla and little studied lineages

Abstract

Nitrogen, sulfur and carbon fluxes in the terrestrial subsurface are determined by the intersecting activities of microbial community members, yet the organisms responsible are largely unknown. Metagenomic methods can identify organisms and functions, but genome recovery is often precluded by data complexity. To address this limitation, we developed subsampling assembly methods to re-construct high-quality draft genomes from complex samples. We applied these methods to evaluate the interlinked roles of the most abundant organisms in biogeochemical cycling in the aquifer sediment. Community proteomics confirmed these activities. The eight most abundant organisms belong to novel lineages, and two represent phyla with no previously sequenced genome. Four organisms are predicted to fix carbon via the Calvin-Benson-Bassham, Wood-Ljungdahl or 3-hydroxyproprionate/4-hydroxybutarate pathways. The profiled organisms are involved in the network of denitrification, dissimilatory nitrate reduction to ammonia, ammonia oxidation and sulfate reduction/oxidation, and require substrates supplied by other community members. An ammonium-oxidizing Thaumarchaeote is the most abundant community member, despite low ammonium concentrations in the groundwater. This organism likely benefits from two other relatively abundant organisms capable of producing ammonium from nitrate, which is abundant in the groundwater. Overall, dominant members of the microbial community are interconnected through exchange of geochemical resources.

Authors:
 [1];  [1];  [1];  [2];  [3];  [3];  [4];  [5];  [1];  [6]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science
  2. Univ. of California, Berkeley, CA (United States). Dept. of Plant and Microbial Biology
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. The Ohio State Univ., Columbus, OH (United States). Dept. of Microbiology; The Ohio State Univ., Columbus, OH (United States). School of Earth Sciences
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Dept. of Geophysics, Division of Earth Sciences
  6. Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science; Univ. of California, Berkeley, CA (United States). Dept. of Environmental Science, Policy, and Management
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Natural Sciences and Engineering Research Council of Canada (NSERC); Work for Others (WFO)
OSTI Identifier:
1328276
Alternate Identifier(s):
OSTI ID: 1470999
Grant/Contract Number:  
AC05-00OR22725; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Environmental Microbiology
Additional Journal Information:
Journal Volume: 18; Journal Issue: 1; Journal ID: ISSN 1462-2912
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES

Citation Formats

Hug, Laura A., Thomas, Brian C., Sharon, Itai, Brown, Christopher T., Sharma, Ritin, Hettich, Robert L., Wilkins, Michael J., Williams, Kenneth H., Singh, Andrea, and Banfield, Jillian F. Critical biogeochemical functions in the subsurface are associated with bacteria from new phyla and little studied lineages. United States: N. p., 2015. Web. doi:10.1111/1462-2920.12930.
Hug, Laura A., Thomas, Brian C., Sharon, Itai, Brown, Christopher T., Sharma, Ritin, Hettich, Robert L., Wilkins, Michael J., Williams, Kenneth H., Singh, Andrea, & Banfield, Jillian F. Critical biogeochemical functions in the subsurface are associated with bacteria from new phyla and little studied lineages. United States. https://doi.org/10.1111/1462-2920.12930
Hug, Laura A., Thomas, Brian C., Sharon, Itai, Brown, Christopher T., Sharma, Ritin, Hettich, Robert L., Wilkins, Michael J., Williams, Kenneth H., Singh, Andrea, and Banfield, Jillian F. Wed . "Critical biogeochemical functions in the subsurface are associated with bacteria from new phyla and little studied lineages". United States. https://doi.org/10.1111/1462-2920.12930. https://www.osti.gov/servlets/purl/1328276.
@article{osti_1328276,
title = {Critical biogeochemical functions in the subsurface are associated with bacteria from new phyla and little studied lineages},
author = {Hug, Laura A. and Thomas, Brian C. and Sharon, Itai and Brown, Christopher T. and Sharma, Ritin and Hettich, Robert L. and Wilkins, Michael J. and Williams, Kenneth H. and Singh, Andrea and Banfield, Jillian F.},
abstractNote = {Nitrogen, sulfur and carbon fluxes in the terrestrial subsurface are determined by the intersecting activities of microbial community members, yet the organisms responsible are largely unknown. Metagenomic methods can identify organisms and functions, but genome recovery is often precluded by data complexity. To address this limitation, we developed subsampling assembly methods to re-construct high-quality draft genomes from complex samples. We applied these methods to evaluate the interlinked roles of the most abundant organisms in biogeochemical cycling in the aquifer sediment. Community proteomics confirmed these activities. The eight most abundant organisms belong to novel lineages, and two represent phyla with no previously sequenced genome. Four organisms are predicted to fix carbon via the Calvin-Benson-Bassham, Wood-Ljungdahl or 3-hydroxyproprionate/4-hydroxybutarate pathways. The profiled organisms are involved in the network of denitrification, dissimilatory nitrate reduction to ammonia, ammonia oxidation and sulfate reduction/oxidation, and require substrates supplied by other community members. An ammonium-oxidizing Thaumarchaeote is the most abundant community member, despite low ammonium concentrations in the groundwater. This organism likely benefits from two other relatively abundant organisms capable of producing ammonium from nitrate, which is abundant in the groundwater. Overall, dominant members of the microbial community are interconnected through exchange of geochemical resources.},
doi = {10.1111/1462-2920.12930},
journal = {Environmental Microbiology},
number = 1,
volume = 18,
place = {United States},
year = {Wed Jul 22 00:00:00 EDT 2015},
month = {Wed Jul 22 00:00:00 EDT 2015}
}

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