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Bacterial and Archaeal Viruses of Himalayan Hot Springs at Manikaran Modulate Host Genomes

Journal Article · · Frontiers in Microbiology
 [1];  [2];  [3];  [4];  [5];  [4];  [2];  [5];  [6];  [4]
  1. Univ. of Delhi, New Delhi (India). Dept. of Zoology; Argonne National Lab. (ANL), Argonne, IL (United States). Biosciences Division; Univ. of Chicago, IL (United States). Dept. of Surgery; DOE/OSTI
  2. Helmholtz Centre for Environmental Research, Leipzig (Germany). Dept. of Isotope Biogeochemistry
  3. Helmholtz Centre for Environmental Research, Leipzig (Germany). Dept. of Environmental Microbiology
  4. Univ. of Delhi, New Delhi (India). Dept. of Zoology
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Biosciences Division; Univ. of Chicago, IL (United States). Dept. of Surgery
  6. Univ. of Chicago, IL (United States). Dept. of Surgery

Hot spring-associated viruses, particularly the archaeal viruses, remain under-examined compared to bacteriophages. Previous metagenomic studies of the Manikaran hot springs in India suggested an abundance of viral DNA, which prompted us to examine the virus–host (bacterial and archaeal) interactions in sediment and microbial mat samples collected from the thermal discharges. Here, we characterize the viruses (both bacterial and archaeal) from this Himalayan hot spring using both metagenomics assembly and electron microscopy. We utilized four shotgun samples from sediment (78–98°C) and two from microbial mats (50°C) to reconstruct 65 bacteriophage genomes (24–200 kb). We also identified 59 archaeal viruses that were notably abundant across the sediment samples. Whole-genome analyses of the reconstructed bacteriophage genomes revealed greater genomic conservation in sediments (65%) compared to microbial mats (49%). However, a minimal phage genome was still maintained across both sediment and microbial mats suggesting a common origin. To complement the metagenomic data, scanning-electron and helium-ion microscopy were used to reveal diverse morphotypes of Caudovirales and archaeal viruses. The genome level annotations provide further evidence for gene-level exchange between virus and host in these hot springs, and augments our knowledgebase for bacteriophages, archaeal viruses and Clustered Regularly Interspaced Short Palindromic Repeat cassettes, which provide a critical resource for studying viromes in extreme natural environments.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1628173
Journal Information:
Frontiers in Microbiology, Journal Name: Frontiers in Microbiology Vol. 9; ISSN 1664-302X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Draft Genome Sequence of Deinococcus sp. Strain S9, Isolated from Microbial Mat Deposits of Hot Springs Located atop the Himalayan Ranges at Manikaran, India journal July 2019
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Comparative metagenomics of microbial mats from hypersaline lakes at Rottnest Island (WA, Australia), advancing our understanding of the effect of mat community and functional genes on microbialite accretion journal January 2020
Comparative metagenomic analyses of a high-altitude Himalayan geothermal spring revealed temperature-constrained habitat-specific microbial community and metabolic dynamics journal January 2019
A Review on Viral Metagenomics in Extreme Environments journal October 2019