Metagenomic analysis of a high carbon dioxide subsurface microbial community populated by chemolithoautotrophs and bacteria and archaea from candidate phyla

Environmental Microbiology
Joanne B EmersonJillian F Banfield

Abstract

Research on geologic carbon sequestration raises questions about potential impacts of subsurface microbiota on carbon cycling and biogeochemistry. Subsurface, high-CO2 systems are poorly biologically characterized, partly because of difficulty accessing high-volume, uncontaminated samples. CO2 -driven Crystal Geyser (CG, Utah, USA), an established geologic carbon sequestration analogue, provides high volumes of deep (∼ 200-500 m) subsurface fluids. We explored microbial diversity and metabolic potential in this high-CO2 environment by assembly and analysis of metagenomes recovered from geyser water filtrate. The system is dominated by neutrophilic, iron-oxidizing bacteria, including 'marine' Mariprofundus (Zetaproteobacteria) and 'freshwater' Gallionellales, sulfur-oxidizing Thiomicrospira crunogena and Thiobacillus-like Hydrogenophilales. Near-complete genomes were reconstructed for these bacteria. CG is notably populated by a wide diversity of bacteria and archaea from phyla lacking isolated representatives (candidate phyla) and from as-yet undefined lineages. Many bacteria affiliate with OD1, OP3, OP9, PER, ACD58, WWE3, BD1-5, OP11, TM7 and ZB2. The recovery of nearly 100 genes encoding ribulose-1,5 bisphosphate carboxylase-...Continue Reading

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Citations

Jan 23, 2016·Microbial Ecology·Christoph ReitschulerPaul Illmer
May 21, 2015·Environmental Science & Technology·Xi-En LongYong-Guan Zhu
May 10, 2016·Trends in Microbiology·Philip E LongJillian F Banfield
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Nov 25, 2017·Frontiers in Microbiology·Baknoon HamMan Jae Kwon
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Aug 5, 2017·Frontiers in Microbiology·Beverly K ChiuClara S Chan
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