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Title: Genomic comparisons of a bacterial lineage that inhabits both marine and terrestrial deep subsurface systems

Journal Article · · PeerJ
DOI:https://doi.org/10.7717/peerj.3134· OSTI ID:1358388
 [1];  [2];  [2];  [3];  [4]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States); Univ. of Southern California, Los Angeles, CA (United States); USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  2. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  3. Bigelow Lab. for Ocean Sciences, East Boothbay, ME (United States)
  4. Univ. of Hawaii at Manoa, Kaneohe, HI (United States)

It is generally accepted that diverse, poorly characterized microorganisms reside deep within Earth’s crust. One such lineage of deep subsurface-dwelling bacteria is an uncultivated member of theFirmicutesphylum that can dominate molecular surveys from both marine and continental rock fracture fluids, sometimes forming the sole member of a single-species microbiome. Here, we reconstructed a genome from basalt-hosted fluids of the deep subseafloor along the eastern Juan de Fuca Ridge flank and used a phylogenomic analysis to show that, despite vast differences in geographic origin and habitat, it forms a monophyletic clade with the terrestrial deep subsurface genome of “CandidatusDesulforudis audaxviator” MP104C. While a limited number of differences were observed between the marine genome of “CandidatusDesulfopertinax cowenii” modA32 and its terrestrial relative that may be of potential adaptive importance, here it is revealed that the two are remarkably similar thermophiles possessing the genetic capacity for motility, sporulation, hydrogenotrophy, chemoorganotrophy, dissimilatory sulfate reduction, and the ability to fix inorganic carbon via the Wood-Ljungdahl pathway for chemoautotrophic growth. Our results provide insights into the genetic repertoire within marine and terrestrial members of a bacterial lineage that is widespread in the global deep subsurface biosphere, and provides a natural means to investigate adaptations specific to these two environments.

Research Organization:
USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1358388
Alternate ID(s):
OSTI ID: 1379633
Journal Information:
PeerJ, Vol. 5; ISSN 2167-8359
Publisher:
PeerJ Inc.Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (4)

Ecology of Subseafloor Crustal Biofilms journal August 2019
Domestication of previously uncultivated Candidatus Desulforudis audaxviator from a deep aquifer in Siberia sheds light on its physiology and evolution journal March 2019
A metagenomic window into the 2-km-deep terrestrial subsurface aquifer revealed multiple pathways of organic matter decomposition journal August 2018
Energy and carbon metabolisms in a deep terrestrial subsurface fluid microbial community journal June 2017