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Omics Data Sets

Metagenomic Assembly and Prokaryotic Metagenome-Assembled Genome Sequences from the Northern Gulf of Mexico “Dead Zone”

J. Cameron Thrash, Brett J. Baker, Kiley W. Seitz, Ben Temperton, Lauren Gillies Campbell, Nancy N. Rabalais, Bernard Henrissat, Olivia U. Mason
David A. Baltrus, Editor
J. Cameron Thrash
aDepartment of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
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Brett J. Baker
bMarine Science Institute, University of Texas, Austin, Port Aransas, Texas, USA
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Kiley W. Seitz
bMarine Science Institute, University of Texas, Austin, Port Aransas, Texas, USA
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Ben Temperton
cSchool of Biosciences, University of Exeter, Exeter, United Kingdom
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Lauren Gillies Campbell
dDepartment of Earth, Ocean, and Atmospheric Sciences, Florida State University, Tallahassee, Florida, USA
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Nancy N. Rabalais
eDepartment of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
fLouisiana Universities Marine Consortium, Chauvin, Louisiana, USA
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Bernard Henrissat
gArchitecture et Fonction des Macromolécules Biologiques, CNRS, Aix-Marseille Université, Marseille, France
hINRA, USC 1408 AFMB, Marseille, France
iDepartment of Biological Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
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Olivia U. Mason
dDepartment of Earth, Ocean, and Atmospheric Sciences, Florida State University, Tallahassee, Florida, USA
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David A. Baltrus
University of Arizona
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DOI: 10.1128/MRA.01033-18
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ABSTRACT

Coastal regions experiencing declining dissolved oxygen are increasing in number and severity around the world. However, despite the importance of microbial metabolism in coastal hypoxia, few metagenomic surveys exist. Our data set from within the second largest human-caused hypoxic region provides opportunities to more deeply explore the microbiology of these systems.

ANNOUNCEMENT

Marine systems suffering from declines in dissolved oxygen (DO) are becoming more numerous across the globe (1). Many coastal regions experience hypoxia (DO, ≤2 mg liter−1) due to eutrophication from farmland runoff, stratification, and a resulting cascade of microbial processes that consume DO. The northern Gulf of Mexico experiences seasonal bottom water hypoxia that can exceed 22,000 km2 (http://www.noaa.gov/media-release/gulf-of-mexico-dead-zone-is-largest-ever-measured), impacting fisheries and other coastal industries (2). To better understand the microbiology of this system, we sequenced bacterioplankton metagenomes from the 2013 hypoxic region. We previously reported the metabolic contributions from members of uncultivated groups of bacterioplankton (3); however, considerable sequence information for other taxa remains unanalyzed. Here, we report the unbinned metagenomic coassembly of six samples and 50 bacterioplankton metagenome-assembled genome (MAG) sequences.

Site selection, marine chemistry metadata, and extraction, sequencing, and assembly methods were previously described (3, 4). Briefly, metagenomes from the six sites were obtained using one lane of an Illumina HiSeq 2000 instrument (100-bp paired-end sequencing generated by Argonne National Laboratory). Coassembly of all six samples was performed using IDBA-UD (5), resulting in 28,028 contigs of ≥3 kbp (303 contigs were >50 kbp, 72 were >100 kbp, and the largest was 494,909 bp). Integrated Microbial Genomes with Microbiome Samples (IMG/G) (6) annotation predicted 220,893 and 3,176 protein-coding and RNA genes, respectively. Separately, we binned contigs into MAGs (3). The 50 MAGs reported here are distributed in the following taxonomic affiliations (see the Methods section in reference 3): Actinobacteria (n = 12), Alphaproteobacteria (n = 5), Bacteroidetes (n = 6), Gammaproteobacteria (n = 3), Gemmatimonidetes (n = 1), Ignavibacteriae (n = 2), Nitrospina (n = 5), Planctomycetes (n = 7), Proteobacteria (n = 1), Synechococcus (n = 3), Verrucomicrobia (n = 3), and unclassified (n = 2). Twenty-four of the MAGs were estimated at >50% complete, with 16 estimated at >75% complete based on CheckM (7) (see Table S1 at https://doi.org/10.6084/m9.figshare.6911729.v1). All but 2 MAGs had estimated contamination of <9%, with 40 having estimated contamination of <3%. While several of our Actinobacteria MAGs grouped with sequences near the important OM1 clade of marine Actinobacteria (8–10), these are not expected to be true OM1 organisms (see Figure S1 in reference 3 and Table S1 at https://doi.org/10.6084/m9.figshare.6911729.v1), but make useful references for future studies of the group.

Metabolic reconstruction and carbohydrate-active enzyme (CAZyme) prediction were also completed as described (see reference 3 and Table S1 at https://doi.org/10.6084/m9.figshare.6911729.v1). Nitrospina MAGs were the only ones with predicted nitrite-oxidizing metabolism, matching observations from 2012 (11). While the majority of MAGs encoded aerobic metabolism, several taxa additionally had partial to complete pathways for dissimilatory nitrate and/or sulfate reduction (Rhodospirillales and Polaribacter), including dissimilatory nitrate reduction to ammonium, and a few had predicted capacity for sulfur lithotrophy and possible autotrophy (Chromatiales, Rhodospirillales, and Donghicola) (see Table S1 at https://doi.org/10.6084/m9.figshare.6911729.v1). Future comparisons of these data with those from other low-DO systems will illuminate common functional features associated with hypoxia and also provide information about biogeographic distinctions among taxa associated with these regimes.

Data availability.The shotgun sequence data are available the NCBI Sequence Read Archive (SRA) database under the accession numbers SAMN05791315 to SAMN05791320, which comply with MIxS standards (12). The annotated contigs of ≥3 kbp are publicly available at IMG/M under organism ID (OID) 3300003894. The MAGs are publicly available at IMG/M under the following OIDs: 2651870013 to 2651870024, 2651870028 to 2651870030, 2651870044 to 2651870048, 2651870056, 2651870059 to 2651870064, 2651870067 to 2651870071, 2651870074 to 2651870082, 2651870084, 2651870085, 2651870087, 2651870089, 2693429794 to 2693429796, 2693429800, and 2693429806. For a spreadsheet containing tabs that detail CheckM results, taxonomy, IMG/M information, metabolic reconstructions, and transporter and CAZy predictions, see Table S1 at https://doi.org/10.6084/m9.figshare.6911729.v1.

ACKNOWLEDGMENTS

Funding for this work was provided to J.C.T. through the Oak Ridge Associated Universities Ralph E. Powe Junior Faculty Enhancement Award and the Department of Biological Sciences of Louisiana State University. A portion of the funding for this work was provided by a Planning Grant award to O.U.M. from Florida State University. Funding for the research vessel and collection of oceanographic data was provided by the National Oceanic & Atmospheric Administration, Center for Sponsored Coastal Ocean Research Award (NA09NOS4780204) to N.N.R. The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.

Portions of this research were conducted with high-performance computing resources provided by Louisiana State University (http://www.hpc.lsu.edu).

We thank the crew of the R/V Pelican.

FOOTNOTES

  • Address correspondence to J. Cameron Thrash, joz.ennn{at}gmail.com, or Olivia U. Mason, omason{at}fsu.edu.
  • Citation Thrash JC, Baker BJ, Seitz KW, Temperton B, Campbell LG, Rabalais NN, Henrissat B, Mason OU. 2018. Metagenomic assembly and prokaryotic metagenome-assembled genome sequences from the northern Gulf of Mexico “Dead Zone.” Microbiol Resour Announc 7:e01033-18. https://doi.org/10.1128/MRA.01033-18.

  • Received 22 July 2018.
  • Accepted 2 August 2018.
  • Published 6 September 2018.
  • Copyright © 2018 Thrash et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

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Metagenomic Assembly and Prokaryotic Metagenome-Assembled Genome Sequences from the Northern Gulf of Mexico “Dead Zone”
J. Cameron Thrash, Brett J. Baker, Kiley W. Seitz, Ben Temperton, Lauren Gillies Campbell, Nancy N. Rabalais, Bernard Henrissat, Olivia U. Mason
Microbiology Resource Announcements Sep 2018, 7 (9) e01033-18; DOI: 10.1128/MRA.01033-18

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Metagenomic Assembly and Prokaryotic Metagenome-Assembled Genome Sequences from the Northern Gulf of Mexico “Dead Zone”
J. Cameron Thrash, Brett J. Baker, Kiley W. Seitz, Ben Temperton, Lauren Gillies Campbell, Nancy N. Rabalais, Bernard Henrissat, Olivia U. Mason
Microbiology Resource Announcements Sep 2018, 7 (9) e01033-18; DOI: 10.1128/MRA.01033-18
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