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Pascoal F, Tomasino MP, Piredda R, Quero GM, Torgo L, Poulain J, Galand PE, Fuhrman JA, Mitchell A, Tinta T, Turk Dermastia T, Fernandez-Guerra A, Vezzi A, Logares R, Malfatti F, Endo H, Dąbrowska AM, De Pascale F, Sánchez P, Henry N, Fosso B, Wilson B, Toshchakov S, Ferrant GK, Grigorov I, Vieira FRJ, Costa R, Pesant S, Magalhães C. Inter-comparison of marine microbiome sampling protocols. ISME Commun 2023; 3:84. [PMID: 37598259 PMCID: PMC10439934 DOI: 10.1038/s43705-023-00278-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 06/19/2023] [Accepted: 06/23/2023] [Indexed: 08/21/2023]
Abstract
Research on marine microbial communities is growing, but studies are hard to compare because of variation in seawater sampling protocols. To help researchers in the inter-comparison of studies that use different seawater sampling methodologies, as well as to help them design future sampling campaigns, we developed the EuroMarine Open Science Exploration initiative (EMOSE). Within the EMOSE framework, we sampled thousands of liters of seawater from a single station in the NW Mediterranean Sea (Service d'Observation du Laboratoire Arago [SOLA], Banyuls-sur-Mer), during one single day. The resulting dataset includes multiple seawater processing approaches, encompassing different material-type kinds of filters (cartridge membrane and flat membrane), three different size fractionations (>0.22 µm, 0.22-3 µm, 3-20 µm and >20 µm), and a number of different seawater volumes ranging from 1 L up to 1000 L. We show that the volume of seawater that is filtered does not have a significant effect on prokaryotic and protist diversity, independently of the sequencing strategy. However, there was a clear difference in alpha and beta diversity between size fractions and between these and "whole water" (with no pre-fractionation). Overall, we recommend care when merging data from datasets that use filters of different pore size, but we consider that the type of filter and volume should not act as confounding variables for the tested sequencing strategies. To the best of our knowledge, this is the first time a publicly available dataset effectively allows for the clarification of the impact of marine microbiome methodological options across a wide range of protocols, including large-scale variations in sampled volume.
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Affiliation(s)
- Francisco Pascoal
- Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208, Porto, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, rua do Campo Alegre s/n, 4169- 007, Porto, Portugal
| | - Maria Paola Tomasino
- Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208, Porto, Portugal
| | - Roberta Piredda
- Integrative Marine Ecology Department, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Grazia Marina Quero
- Institute for Biological Resources and Marine Biotechnologies, National Research Council (IRBIM-CNR), Largo Fiera della Pesca 2, 60125, Ancona, Italy
| | - Luís Torgo
- Faculty of Computer Science, Dalhousie University, Halifax, NS, Canada
| | - Julie Poulain
- Génomique Métabolique, Genoscope, Institut François Jacob, CEA, CNRS, Univ Evry, Université Paris-Saclay, 2 Rue Gaston Crémieux, 91057, Evry, France
| | - Pierre E Galand
- Sorbonne Université, CNRS, Laboratoire d'Écogéochimie des Environnements Benthiques (LECOB), Observatoire Océanologique de Banyuls, Banyuls-sur-Mer, France
| | - Jed A Fuhrman
- Marine & Environmental Biology, Department of Biological Sciences, University of Southern California (USC), Los Angeles, CA, USA
| | - Alex Mitchell
- EMBL's European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SD, UK
| | - Tinkara Tinta
- National Institute of Biology, Marine Biology Station Piran, Piran, Slovenia
| | | | - Antonio Fernandez-Guerra
- Lundbeck Foundation GeoGenetics Centre, GLOBE Institute, University of Copenhagen, Copenhagen, Denmark
| | - Alessandro Vezzi
- Department of Biology, University of Padua, Via U. Bassi 58/B, 35131, Padua, Italy
| | - Ramiro Logares
- Institute of Marine Sciences (ICM), CSIC. Passeig Marítim de la Barceloneta, 37-49, ES08003, Barcelona, Spain
| | | | - Hisashi Endo
- Bioinformatics Center, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Japan
| | - Anna Maria Dąbrowska
- Department of Marine Ecology, Institute of Oceanology Polish Academy of Sciences, Sopot, Poland
| | - Fabio De Pascale
- Department of Biology, University of Padua, Via U. Bassi 58/B, 35131, Padua, Italy
| | - Pablo Sánchez
- Institute of Marine Sciences (ICM), CSIC. Passeig Marítim de la Barceloneta, 37-49, ES08003, Barcelona, Spain
| | - Nicolas Henry
- Sorbonne Université, CNRS, Station Biologique de Roscoff, AD2M ECOMAP, UMR 7144, Roscoff, France
- CNRS, FR2424, ABiMS, Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
| | - Bruno Fosso
- Department of Biosciences, Biotechnologies and Environment, University of Bari, 70126, Bari, Italy
| | - Bryan Wilson
- Department of Biology, John Krebs Field Station, University of Oxford, Wytham, OX2 8QJ, UK
| | | | | | - Ivo Grigorov
- Technical University of Denmark, National Institute of Aquatic Resources, Kgs. Lyngby, Denmark
| | | | - Rodrigo Costa
- Department of Bioengineering, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
- Institute for Bioengineering and Biosciences (iBB) and i4HB-Institute for Health and Bioeconomy, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
| | - Stéphane Pesant
- EMBL's European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SD, UK.
| | - Catarina Magalhães
- Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208, Porto, Portugal.
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, rua do Campo Alegre s/n, 4169- 007, Porto, Portugal.
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Fletcher-Hoppe C, Yeh YC, Raut Y, Weissman JL, Fuhrman JA. Symbiotic UCYN-A strains co-occurred with El Niño, relaxed upwelling, and varied eukaryotes over 10 years off Southern California. ISME Commun 2023; 3:63. [PMID: 37355737 PMCID: PMC10290647 DOI: 10.1038/s43705-023-00268-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 05/05/2023] [Accepted: 06/12/2023] [Indexed: 06/26/2023]
Abstract
Biological nitrogen fixation, the conversion of N2 gas into a bioavailable form, is vital to sustaining marine primary production. Studies have shifted beyond traditionally studied tropical diazotrophs. Candidatus Atelocyanobacterium thalassa (or UCYN-A) has emerged as a focal point due to its streamlined metabolism, intimate partnership with a haptophyte host, and broad distribution. Here, we explore the environmental parameters that govern UCYN-A's presence at the San Pedro Ocean Time-series (SPOT), its host specificity, and statistically significant interactions with non-host eukaryotes from 2008-2018. 16S and 18S rRNA gene sequences were amplified by "universal primers" from monthly samples and resolved into Amplicon Sequence Variants, allowing us to observe multiple UCYN-A symbioses. UCYN-A1 relative abundances increased following the 2015-2016 El Niño event. This "open ocean ecotype" was present when coastal upwelling declined, and Ekman transport brought tropical waters into the region. Network analyses reveal all strains of UCYN-A co-occur with dinoflagellates including Lepidodinium, a potential predator, and parasitic Syndiniales. UCYN-A2 appeared to pair with multiple hosts and was not tightly coupled to its predominant host, while UCYN-A1 maintained a strong host-symbiont relationship. These biological relationships are particularly important to study in the context of climate change, which will alter UCYN-A distribution at regional and global scales.
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Affiliation(s)
- Colette Fletcher-Hoppe
- Marine & Environmental Biology, Department of Biological Sciences, University of Southern California (USC), Los Angeles, CA, USA
| | - Yi-Chun Yeh
- Marine & Environmental Biology, Department of Biological Sciences, University of Southern California (USC), Los Angeles, CA, USA
- Department of Global Ecology, Carnegie Institution for Science, Stanford University, Stanford, CA, USA
| | - Yubin Raut
- Marine & Environmental Biology, Department of Biological Sciences, University of Southern California (USC), Los Angeles, CA, USA
| | - J L Weissman
- Marine & Environmental Biology, Department of Biological Sciences, University of Southern California (USC), Los Angeles, CA, USA
- Schmid College of Science and Technology, Chapman University, Orange, CA, USA
| | - Jed A Fuhrman
- Marine & Environmental Biology, Department of Biological Sciences, University of Southern California (USC), Los Angeles, CA, USA.
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Parada AE, Mayali X, Weber PK, Wollard J, Santoro AE, Fuhrman JA, Pett-Ridge J, Dekas AE. Constraining the composition and quantity of organic matter used by abundant marine Thaumarchaeota. Environ Microbiol 2023; 25:689-704. [PMID: 36478085 DOI: 10.1111/1462-2920.16299] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 11/27/2022] [Indexed: 12/12/2022]
Abstract
Marine Group I (MGI) Thaumarchaeota were originally described as chemoautotrophic nitrifiers, but molecular and isotopic evidence suggests heterotrophic and/or mixotrophic capabilities. Here, we investigated the quantity and composition of organic matter assimilated by individual, uncultured MGI cells from the Pacific Ocean to constrain their potential for mixotrophy and heterotrophy. We observed that most MGI cells did not assimilate carbon from any organic substrate provided (glucose, pyruvate, oxaloacetate, protein, urea, and amino acids). The minority of MGI cells that did assimilate it did so exclusively from nitrogenous substrates (urea, 15% of MGI and amino acids, 36% of MGI), and only as an auxiliary carbon source (<20% of that subset's total cellular carbon was derived from those substrates). At the population level, MGI assimilation of organic carbon comprised just 0.5%-11% of total biomass carbon. We observed extensive assimilation of inorganic carbon and urea- and amino acid-derived nitrogen (equal to that from ammonium), consistent with metagenomic and metatranscriptomic analyses performed here and previously showing a widespread potential for MGI to perform autotrophy and transport and degrade organic nitrogen. Our results constrain the quantity and composition of organic matter used by MGI and suggest they use it primarily to meet nitrogen demands for anabolism and nitrification.
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Affiliation(s)
- Alma E Parada
- Department of Earth System Science, Stanford University, Stanford, California, USA
| | - Xavier Mayali
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California, USA
| | - Peter K Weber
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California, USA
| | - Jessica Wollard
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California, USA
| | - Alyson E Santoro
- Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, California, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, California, USA
| | - Jennifer Pett-Ridge
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California, USA
| | - Anne E Dekas
- Department of Earth System Science, Stanford University, Stanford, California, USA
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California, USA
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4
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Dart E, Fuhrman JA, Ahlgren NA. Diverse Marine T4-like Cyanophage Communities Are Primarily Comprised of Low-Abundance Species Including Species with Distinct Seasonal, Persistent, Occasional, or Sporadic Dynamics. Viruses 2023; 15:v15020581. [PMID: 36851794 PMCID: PMC9960396 DOI: 10.3390/v15020581] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 02/16/2023] [Accepted: 02/17/2023] [Indexed: 02/22/2023] Open
Abstract
Cyanophages exert important top-down controls on their cyanobacteria hosts; however, concurrent analysis of both phage and host populations is needed to better assess phage-host interaction models. We analyzed picocyanobacteria Prochlorococcus and Synechococcus and T4-like cyanophage communities in Pacific Ocean surface waters using five years of monthly viral and cellular fraction metagenomes. Cyanophage communities contained thousands of mostly low-abundance (<2% relative abundance) species with varying temporal dynamics, categorized as seasonally recurring or non-seasonal and occurring persistently, occasionally, or sporadically (detected in ≥85%, 15-85%, or <15% of samples, respectively). Viromes contained mostly seasonal and persistent phages (~40% each), while cellular fraction metagenomes had mostly sporadic species (~50%), reflecting that these sample sets capture different steps of the infection cycle-virions from prior infections or within currently infected cells, respectively. Two groups of seasonal phages correlated to Synechococcus or Prochlorococcus were abundant in spring/summer or fall/winter, respectively. Cyanophages likely have a strong influence on the host community structure, as their communities explained up to 32% of host community variation. These results support how both seasonally recurrent and apparent stochastic processes, likely determined by host availability and different host-range strategies among phages, are critical to phage-host interactions and dynamics, consistent with both the Kill-the-Winner and the Bank models.
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Affiliation(s)
- Emily Dart
- Department of Biology, Clark University, Worcester, MA 01610, USA
| | - Jed A. Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Nathan A. Ahlgren
- Department of Biology, Clark University, Worcester, MA 01610, USA
- Correspondence: ; Tel.: +1-(508)-793-7107
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Du Y, Fuhrman JA, Sun F. ViralCC retrieves complete viral genomes and virus-host pairs from metagenomic Hi-C data. Nat Commun 2023; 14:502. [PMID: 36720887 PMCID: PMC9889337 DOI: 10.1038/s41467-023-35945-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 01/09/2023] [Indexed: 02/01/2023] Open
Abstract
The introduction of high-throughput chromosome conformation capture (Hi-C) into metagenomics enables reconstructing high-quality metagenome-assembled genomes (MAGs) from microbial communities. Despite recent advances in recovering eukaryotic, bacterial, and archaeal genomes using Hi-C contact maps, few of Hi-C-based methods are designed to retrieve viral genomes. Here we introduce ViralCC, a publicly available tool to recover complete viral genomes and detect virus-host pairs using Hi-C data. Compared to other Hi-C-based methods, ViralCC leverages the virus-host proximity structure as a complementary information source for the Hi-C interactions. Using mock and real metagenomic Hi-C datasets from several different microbial ecosystems, including the human gut, cow fecal, and wastewater, we demonstrate that ViralCC outperforms existing Hi-C-based binning methods as well as state-of-the-art tools specifically dedicated to metagenomic viral binning. ViralCC can also reveal the taxonomic structure of viruses and virus-host pairs in microbial communities. When applied to a real wastewater metagenomic Hi-C dataset, ViralCC constructs a phage-host network, which is further validated using CRISPR spacer analyses. ViralCC is an open-source pipeline available at https://github.com/dyxstat/ViralCC .
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Affiliation(s)
- Yuxuan Du
- Department of Quantitative and Computational Biology, University of Southern California, Los Angeles, CA, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Fengzhu Sun
- Department of Quantitative and Computational Biology, University of Southern California, Los Angeles, CA, USA.
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6
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Yeh YC, Fuhrman JA. Contrasting diversity patterns of prokaryotes and protists over time and depth at the San-Pedro Ocean Time series. ISME Commun 2022; 2:36. [PMID: 37938286 PMCID: PMC9723720 DOI: 10.1038/s43705-022-00121-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 03/21/2022] [Accepted: 03/23/2022] [Indexed: 06/18/2023]
Abstract
Community dynamics are central in microbial ecology, yet we lack studies comparing diversity patterns among marine protists and prokaryotes over depth and multiple years. Here, we characterized microbes at the San-Pedro Ocean Time series (2005-2018), using SSU rRNA gene sequencing from two size fractions (0.2-1 and 1-80 μm), with a universal primer set that amplifies from both prokaryotes and eukaryotes, allowing direct comparisons of diversity patterns in a single set of analyses. The 16S + 18S rRNA gene composition in the small size fraction was mostly prokaryotic (>92%) as expected, but the large size fraction unexpectedly contained 46-93% prokaryotic 16S rRNA genes. Prokaryotes and protists showed opposite vertical diversity patterns; prokaryotic diversity peaked at mid-depth, protistan diversity at the surface. Temporal beta-diversity patterns indicated prokaryote communities were much more stable than protists. Although the prokaryotic communities changed monthly, the average community stayed remarkably steady over 14 years, showing high resilience. Additionally, particle-associated prokaryotes were more diverse than smaller free-living ones, especially at deeper depths, contributed unexpectedly by abundant and diverse SAR11 clade II. Eukaryotic diversity was strongly correlated with the diversity of particle-associated prokaryotes but not free-living ones, reflecting that physical associations result in the strongest interactions, including symbioses, parasitism, and decomposer relationships.
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Affiliation(s)
- Yi-Chun Yeh
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, 90089-0371, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, 90089-0371, USA.
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Abstract
Motivation Phage–host associations play important roles in microbial communities. But in natural communities, as opposed to culture-based lab studies where phages are discovered and characterized metagenomically, their hosts are generally not known. Several programs have been developed for predicting which phage infects which host based on various sequence similarity measures or machine learning approaches. These are often based on whole viral and host genomes, but in metagenomics-based studies, we rarely have whole genomes but rather must rely on contigs that are sometimes as short as hundreds of bp long. Therefore, we need programs that predict hosts of phage contigs on the basis of these short contigs. Although most existing programs can be applied to metagenomic datasets for these predictions, their accuracies are generally low. Here, we develop ContigNet, a convolutional neural network-based model capable of predicting phage–host matches based on relatively short contigs, and compare it to previously published VirHostMatcher (VHM) and WIsH. Results On the validation set, ContigNet achieves 72–85% area under the receiver operating characteristic curve (AUROC) scores, compared to the maximum of 68% by VHM or WIsH for contigs of lengths between 200 bps to 50 kbps. We also apply the model to the Metagenomic Gut Virus (MGV) catalogue, a dataset containing a wide range of draft genomes from metagenomic samples and achieve 60–70% AUROC scores compared to that of VHM and WIsH of 52%. Surprisingly, ContigNet can also be used to predict plasmid-host contig associations with high accuracy, indicating a similar genetic exchange between mobile genetic elements and their hosts. Availability and implementation The source code of ContigNet and related datasets can be downloaded from https://github.com/tianqitang1/ContigNet.
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Affiliation(s)
- Tianqi Tang
- Department of Quantitative and Computational Biology, University of Southern California, Los Angeles, CA 90089, USA
| | - Shengwei Hou
- Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
- Marine and Environmental Biology, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Jed A Fuhrman
- Marine and Environmental Biology, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Fengzhu Sun
- To whom correspondence should be addressed. E-mail:
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Abstract
Clustered regularly interspaced short palindromic repeat (CRISPR)-Cas adaptive immune systems enable bacteria and archaea to efficiently respond to viral pathogens by creating a genomic record of previous encounters. These systems are broadly distributed across prokaryotic taxa, yet are surprisingly absent in a majority of organisms, suggesting that the benefits of adaptive immunity frequently do not outweigh the costs. Here, combining experiments and models, we show that a delayed immune response which allows viruses to transiently redirect cellular resources to reproduction, which we call ‘immune lag’, is extremely costly during viral outbreaks, even to completely immune hosts. Critically, the costs of lag are only revealed by examining the early, transient dynamics of a host–virus system occurring immediately after viral challenge. Lag is a basic parameter of microbial defence, relevant to all intracellular, post-infection antiviral defence systems, that has to-date been largely ignored by theoretical and experimental treatments of host-phage systems.
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Affiliation(s)
- Jake L Weissman
- Department of Biological Sciences-Marine and Environmental Biology, University of Southern California, Los Angeles, CA, USA
| | - Ellinor O Alseth
- Environment and Sustainability Institute, Biosciences, University of Exeter, Penryn Campus, Penryn, UK
| | - Sean Meaden
- Environment and Sustainability Institute, Biosciences, University of Exeter, Penryn Campus, Penryn, UK
| | - Edze R Westra
- Environment and Sustainability Institute, Biosciences, University of Exeter, Penryn Campus, Penryn, UK
| | - Jed A Fuhrman
- Department of Biological Sciences-Marine and Environmental Biology, University of Southern California, Los Angeles, CA, USA
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9
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Yeh YC, McNichol J, Needham DM, Fichot EB, Berdjeb L, Fuhrman JA. Comprehensive single-PCR 16S and 18S rRNA community analysis validated with mock communities, and estimation of sequencing bias against 18S. Environ Microbiol 2021; 23:3240-3250. [PMID: 33938123 DOI: 10.1111/1462-2920.15553] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 04/12/2021] [Accepted: 04/30/2021] [Indexed: 01/04/2023]
Abstract
Universal primers for SSU rRNA genes allow profiling of natural communities by simultaneously amplifying templates from Bacteria, Archaea, and Eukaryota in a single PCR reaction. Despite the potential to show relative abundance for all rRNA genes, universal primers are rarely used, due to various concerns including amplicon length variation and its effect on bioinformatic pipelines. We thus developed 16S and 18S rRNA mock communities and a bioinformatic pipeline to validate this approach. Using these mocks, we show that universal primers (515Y/926R) outperformed eukaryote-specific V4 primers in observed versus expected abundance correlations (slope = 0.88 vs. 0.67-0.79), and mock community members with single mismatches to the primer were strongly underestimated (threefold to eightfold). Using field samples, both primers yielded similar 18S beta-diversity patterns (Mantel test, p < 0.001) but differences in relative proportions of many rarer taxa. To test for length biases, we mixed mock communities (16S + 18S) before PCR and found a twofold underestimation of 18S sequences due to sequencing bias. Correcting for the twofold underestimation, we estimate that, in Southern California field samples (1.2-80 μm), there were averages of 35% 18S, 28% chloroplast 16S, and 37% prokaryote 16S rRNA genes. These data demonstrate the potential for universal primers to generate comprehensive microbiome profiles.
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Affiliation(s)
- Yi-Chun Yeh
- Department of Biological Sciences, University of Southern California, CA, Los Angeles, 90089-0371, USA
| | - Jesse McNichol
- Department of Biological Sciences, University of Southern California, CA, Los Angeles, 90089-0371, USA
| | - David M Needham
- Department of Biological Sciences, University of Southern California, CA, Los Angeles, 90089-0371, USA
| | - Erin B Fichot
- Department of Biological Sciences, University of Southern California, CA, Los Angeles, 90089-0371, USA
| | - Lyria Berdjeb
- Department of Biological Sciences, University of Southern California, CA, Los Angeles, 90089-0371, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, CA, Los Angeles, 90089-0371, USA
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10
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Sieradzki ET, Morando M, Fuhrman JA. Metagenomics and Quantitative Stable Isotope Probing Offer Insights into Metabolism of Polycyclic Aromatic Hydrocarbon Degraders in Chronically Polluted Seawater. mSystems 2021; 6:e00245-21. [PMID: 33975968 PMCID: PMC8125074 DOI: 10.1128/msystems.00245-21] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 04/12/2021] [Indexed: 11/21/2022] Open
Abstract
Bacterial biodegradation is a significant contributor to remineralization of polycyclic aromatic hydrocarbons (PAHs)-toxic and recalcitrant components of crude oil as well as by-products of partial combustion chronically introduced into seawater via atmospheric deposition. The Deepwater Horizon oil spill demonstrated the speed at which a seed PAH-degrading community maintained by chronic inputs responds to acute pollution. We investigated the diversity and functional potential of a similar seed community in the chronically polluted Port of Los Angeles (POLA), using stable isotope probing with naphthalene, deep-sequenced metagenomes, and carbon incorporation rate measurements at the port and in two sites in the San Pedro Channel. We demonstrate the ability of the community of degraders at the POLA to incorporate carbon from naphthalene, leading to a quick shift in microbial community composition to be dominated by the normally rare Colwellia and Cycloclasticus We show that metagenome-assembled genomes (MAGs) belonged to these naphthalene degraders by matching their 16S-rRNA gene with experimental stable isotope probing data. Surprisingly, we did not find a full PAH degradation pathway in those genomes, even when combining genes from the entire microbial community, leading us to hypothesize that promiscuous dehydrogenases replace canonical naphthalene degradation enzymes in this site. We compared metabolic pathways identified in 29 genomes whose abundance increased in the presence of naphthalene to generate genomic-based recommendations for future optimization of PAH bioremediation at the POLA, e.g., ammonium as opposed to urea, heme or hemoproteins as an iron source, and polar amino acids.IMPORTANCE Oil spills in the marine environment have a devastating effect on marine life and biogeochemical cycles through bioaccumulation of toxic hydrocarbons and oxygen depletion by hydrocarbon-degrading bacteria. Oil-degrading bacteria occur naturally in the ocean, especially where they are supported by chronic inputs of oil or other organic carbon sources, and have a significant role in degradation of oil spills. Polycyclic aromatic hydrocarbons are the most persistent and toxic component of crude oil. Therefore, the bacteria that can break those molecules down are of particular importance. We identified such bacteria at the Port of Los Angeles (POLA), one of the busiest ports worldwide, and characterized their metabolic capabilities. We propose chemical targets based on those analyses to stimulate the activity of these bacteria in case of an oil spill in the Port POLA.
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Affiliation(s)
- Ella T Sieradzki
- Department of Biological Sciences, University of Southern California, Los Angeles, California, USA
| | - Michael Morando
- Department of Biological Sciences, University of Southern California, Los Angeles, California, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, California, USA
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11
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Messer LF, Ostrowski M, Doblin MA, Petrou K, Baird ME, Ingleton T, Bissett A, Van de Kamp J, Nelson T, Paulsen I, Bodrossy L, Fuhrman JA, Seymour JR, Brown MV. Microbial tropicalization driven by a strengthening western ocean boundary current. Glob Chang Biol 2020; 26:5613-5629. [PMID: 32715608 DOI: 10.1111/gcb.15257] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 04/22/2020] [Accepted: 06/09/2020] [Indexed: 06/11/2023]
Abstract
Western boundary currents (WBCs) redistribute heat and oligotrophic seawater from the tropics to temperate latitudes, with several displaying substantial climate change-driven intensification over the last century. Strengthening WBCs have been implicated in the poleward range expansion of marine macroflora and fauna, however, the impacts on the structure and function of temperate microbial communities are largely unknown. Here we show that the major subtropical WBC of the South Pacific Ocean, the East Australian Current (EAC), transports microbial assemblages that maintain tropical and oligotrophic (k-strategist) signatures, to seasonally displace more copiotrophic (r-strategist) temperate microbial populations within temperate latitudes of the Tasman Sea. We identified specific characteristics of EAC microbial assemblages compared with non-EAC assemblages, including strain transitions within the SAR11 clade, enrichment of Prochlorococcus, predicted smaller genome sizes and shifts in the importance of several functional genes, including those associated with cyanobacterial photosynthesis, secondary metabolism and fatty acid and lipid transport. At a temperate time-series site in the Tasman Sea, we observed significant reductions in standing stocks of total carbon and chlorophyll a, and a shift towards smaller phytoplankton and carnivorous copepods, associated with the seasonal impact of the EAC microbial assemblage. In light of the substantial shifts in microbial assemblage structure and function associated with the EAC, we conclude that climate-driven expansions of WBCs will expand the range of tropical oligotrophic microbes, and potentially profoundly impact the trophic status of temperate waters.
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Affiliation(s)
- Lauren F Messer
- Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Qld, Australia
| | - Martin Ostrowski
- Climate Change Cluster, University of Technology, Sydney, Sydney, Australia
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
| | - Martina A Doblin
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
| | - Katherina Petrou
- School of Life Sciences, University of Technology, Sydney, Sydney, NSW, Australia
| | - Mark E Baird
- CSIRO Oceans and Atmosphere, Hobart, Tas., Australia
| | | | | | | | - Tiffanie Nelson
- Geelong Centre for Emerging Infectious Diseases, Deakin University, Melbourne, Vic., Australia
| | - Ian Paulsen
- Climate Change Cluster, University of Technology, Sydney, Sydney, Australia
| | | | - Jed A Fuhrman
- University of Southern California, Los Angeles, CA, USA
| | - Justin R Seymour
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
| | - Mark V Brown
- School of Environmental and Life Sciences, University of Newcastle Australia, Callaghan, NSW, Australia
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12
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Wang W, Ren J, Tang K, Dart E, Ignacio-Espinoza JC, Fuhrman JA, Braun J, Sun F, Ahlgren NA. A network-based integrated framework for predicting virus-prokaryote interactions. NAR Genom Bioinform 2020; 2:lqaa044. [PMID: 32626849 PMCID: PMC7324143 DOI: 10.1093/nargab/lqaa044] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 03/12/2020] [Accepted: 06/05/2020] [Indexed: 12/12/2022] Open
Abstract
Metagenomic sequencing has greatly enhanced the discovery of viral genomic sequences; however, it remains challenging to identify the host(s) of these new viruses. We developed VirHostMatcher-Net, a flexible, network-based, Markov random field framework for predicting virus–prokaryote interactions using multiple, integrated features: CRISPR sequences and alignment-free similarity measures (\documentclass[12pt]{minimal}
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}{}$s_2^*$\end{document} and WIsH). Evaluation of this method on a benchmark set of 1462 known virus–prokaryote pairs yielded host prediction accuracy of 59% and 86% at the genus and phylum levels, representing 16–27% and 6–10% improvement, respectively, over previous single-feature prediction approaches. We applied our host prediction tool to crAssphage, a human gut phage, and two metagenomic virus datasets: marine viruses and viral contigs recovered from globally distributed, diverse habitats. Host predictions were frequently consistent with those of previous studies, but more importantly, this new tool made many more confident predictions than previous tools, up to nearly 3-fold more (n > 27 000), greatly expanding the diversity of known virus–host interactions.
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Affiliation(s)
- Weili Wang
- Quantitative and Computational Biology Program, University of Southern California, Los Angeles, CA 90089, USA
| | - Jie Ren
- Quantitative and Computational Biology Program, University of Southern California, Los Angeles, CA 90089, USA
| | - Kujin Tang
- Quantitative and Computational Biology Program, University of Southern California, Los Angeles, CA 90089, USA
| | - Emily Dart
- Biology Department, Clark University, Worcester, MA 01610, USA
| | | | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Jonathan Braun
- Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Fengzhu Sun
- Quantitative and Computational Biology Program, University of Southern California, Los Angeles, CA 90089, USA
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13
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Wang Z, Wang Y, Fuhrman JA, Sun F, Zhu S. Assessment of metagenomic assemblers based on hybrid reads of real and simulated metagenomic sequences. Brief Bioinform 2020; 21:777-790. [PMID: 30860572 DOI: 10.1093/bib/bbz025] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 01/25/2019] [Indexed: 12/19/2022] Open
Abstract
In metagenomic studies of microbial communities, the short reads come from mixtures of genomes. Read assembly is usually an essential first step for the follow-up studies in metagenomic research. Understanding the power and limitations of various read assembly programs in practice is important for researchers to choose which programs to use in their investigations. Many studies evaluating different assembly programs used either simulated metagenomes or real metagenomes with unknown genome compositions. However, the simulated datasets may not reflect the real complexities of metagenomic samples and the estimated assembly accuracy could be misleading due to the unknown genomes in real metagenomes. Therefore, hybrid strategies are required to evaluate the various read assemblers for metagenomic studies. In this paper, we benchmark the metagenomic read assemblers by mixing reads from real metagenomic datasets with reads from known genomes and evaluating the integrity, contiguity and accuracy of the assembly using the reads from the known genomes. We selected four advanced metagenome assemblers, MEGAHIT, MetaSPAdes, IDBA-UD and Faucet, for evaluation. We showed the strengths and weaknesses of these assemblers in terms of integrity, contiguity and accuracy for different variables, including the genetic difference of the real genomes with the genome sequences in the real metagenomic datasets and the sequencing depth of the simulated datasets. Overall, MetaSPAdes performs best in terms of integrity and continuity at the species-level, followed by MEGAHIT. Faucet performs best in terms of accuracy at the cost of worst integrity and continuity, especially at low sequencing depth. MEGAHIT has the highest genome fractions at the strain-level and MetaSPAdes has the overall best performance at the strain-level. MEGAHIT is the most efficient in our experiments. Availability: The source code is available at https://github.com/ziyewang/MetaAssemblyEval.
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Affiliation(s)
- Ziye Wang
- School of Mathematical Sciences and the Institute of Science and Technology for Brain-inspired Intelligence, Fudan University, Shanghai, China
| | - Ying Wang
- Department of Automation, Xiamen University, Xiamen, China
| | - Jed A Fuhrman
- Department of Biological Sciences and Wrigley Institute for Environmental Studies, University of Southern California, Los Angeles, California, United States of America
| | - Fengzhu Sun
- Department of Biological Sciences, University of Southern California, Los Angeles, California, United States of America
| | - Shanfeng Zhu
- Shanghai Key Lab of Intelligent Information Processing, the School of Computer Science and the Institute of Science and Technology for Brain-inspired Intelligence, Fudan University, Shanghai, China
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14
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Wang Z, Wang Y, Fuhrman JA, Sun F, Zhu S. Corrigendum to: Assessment of metagenomic assemblers based on hybrid reads of real and simulated metagenomic sequences. Brief Bioinform 2020; 22:611. [PMID: 32379299 DOI: 10.1093/bib/bbaa085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 04/23/2019] [Accepted: 05/14/2019] [Indexed: 11/13/2022] Open
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15
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Ren J, Song K, Deng C, Ahlgren NA, Fuhrman JA, Li Y, Xie X, Poplin R, Sun F. Identifying viruses from metagenomic data using deep learning. Quant Biol 2020; 8:64-77. [PMID: 34084563 PMCID: PMC8172088 DOI: 10.1007/s40484-019-0187-4] [Citation(s) in RCA: 202] [Impact Index Per Article: 50.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 10/08/2019] [Accepted: 10/14/2019] [Indexed: 01/08/2023]
Abstract
BACKGROUND The recent development of metagenomic sequencing makes it possible to massively sequence microbial genomes including viral genomes without the need for laboratory culture. Existing reference-based and gene homology-based methods are not efficient in identifying unknown viruses or short viral sequences from metagenomic data. METHODS Here we developed a reference-free and alignment-free machine learning method, DeepVirFinder, for identifying viral sequences in metagenomic data using deep learning. RESULTS Trained based on sequences from viral RefSeq discovered before May 2015, and evaluated on those discovered after that date, DeepVirFinder outperformed the state-of-the-art method VirFinder at all contig lengths, achieving AUROC 0.93, 0.95, 0.97, and 0.98 for 300, 500, 1000, and 3000 bp sequences respectively. Enlarging the training data with additional millions of purified viral sequences from metavirome samples further improved the accuracy for identifying virus groups that are under-represented. Applying DeepVirFinder to real human gut metagenomic samples, we identified 51,138 viral sequences belonging to 175 bins in patients with colorectal carcinoma (CRC). Ten bins were found associated with the cancer status, suggesting viruses may play important roles in CRC. CONCLUSIONS Powered by deep learning and high throughput sequencing metagenomic data, DeepVirFinder significantly improved the accuracy of viral identification and will assist the study of viruses in the era of metagenomics.
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Affiliation(s)
- Jie Ren
- Quantitative and Computational Biology Program, University of Southern California, Los Angeles, CA 90089, USA
| | - Kai Song
- School of Mathematics and Statistics, Qingdao University, Qingdao 266071, China
| | - Chao Deng
- Quantitative and Computational Biology Program, University of Southern California, Los Angeles, CA 90089, USA
| | | | - Jed A. Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Yi Li
- Department of Computer Science, University of California, Irvine, CA 92697, USA
| | - Xiaohui Xie
- Department of Computer Science, University of California, Irvine, CA 92697, USA
| | | | - Fengzhu Sun
- Quantitative and Computational Biology Program, University of Southern California, Los Angeles, CA 90089, USA
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16
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Dekas AE, Parada AE, Mayali X, Fuhrman JA, Wollard J, Weber PK, Pett-Ridge J. Characterizing Chemoautotrophy and Heterotrophy in Marine Archaea and Bacteria With Single-Cell Multi-isotope NanoSIP. Front Microbiol 2019; 10:2682. [PMID: 31920997 PMCID: PMC6927911 DOI: 10.3389/fmicb.2019.02682] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 11/05/2019] [Indexed: 11/28/2022] Open
Abstract
Characterizing and quantifying in situ metabolisms remains both a central goal and challenge for environmental microbiology. Here, we used a single-cell, multi-isotope approach to investigate the anabolic activity of marine microorganisms, with an emphasis on natural populations of Thaumarchaeota. After incubating coastal Pacific Ocean water with 13C-bicarbonate and 15N-amino acids, we used nanoscale secondary ion mass spectrometry (nanoSIMS) to isotopically screen 1,501 individual cells, and 16S rRNA amplicon sequencing to assess community composition. We established isotopic enrichment thresholds for activity and metabolic classification, and with these determined the percentage of anabolically active cells, the distribution of activity across the whole community, and the metabolic lifestyle—chemoautotrophic or heterotrophic—of each cell. Most cells (>90%) were anabolically active during the incubation, and 4–17% were chemoautotrophic. When we inhibited bacteria with antibiotics, the fraction of chemoautotrophic cells detected via nanoSIMS increased, suggesting archaea dominated chemoautotrophy. With fluorescence in situ hybridization coupled to nanoSIMS (FISH-nanoSIMS), we confirmed that most Thaumarchaeota were living chemoautotrophically, while bacteria were not. FISH-nanoSIMS analysis of cells incubated with dual-labeled (13C,15N-) amino acids revealed that most Thaumarchaeota cells assimilated amino-acid-derived nitrogen but not carbon, while bacteria assimilated both. This indicates that some Thaumarchaeota do not assimilate intact amino acids, suggesting intra-phylum heterogeneity in organic carbon utilization, and potentially their use of amino acids for nitrification. Together, our results demonstrate the utility of multi-isotope nanoSIMS analysis for high-throughput metabolic screening, and shed light on the activity and metabolism of uncultured marine archaea and bacteria.
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Affiliation(s)
- Anne E Dekas
- Department of Earth System Science, Stanford University, Stanford, CA, United States.,Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, United States
| | - Alma E Parada
- Department of Earth System Science, Stanford University, Stanford, CA, United States.,Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States
| | - Xavier Mayali
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, United States
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States
| | - Jessica Wollard
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, United States
| | - Peter K Weber
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, United States
| | - Jennifer Pett-Ridge
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, United States
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17
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Ignacio-Espinoza JC, Ahlgren NA, Fuhrman JA. Long-term stability and Red Queen-like strain dynamics in marine viruses. Nat Microbiol 2019; 5:265-271. [PMID: 31819214 DOI: 10.1038/s41564-019-0628-x] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Accepted: 11/04/2019] [Indexed: 11/09/2022]
Abstract
Viruses that infect microorganisms dominate marine microbial communities numerically, with impacts ranging from host evolution to global biogeochemical cycles1,2. However, virus community dynamics, necessary for conceptual and mechanistic model development, remains difficult to assess. Here, we describe the long-term stability of a viral community by analysing the metagenomes of near-surface 0.02-0.2 μm samples from the San Pedro Ocean Time-series3 that were sampled monthly over 5 years. Of 19,907 assembled viral contigs (>5 kb, mean 15 kb), 97% were found in each sample (by >98% ID metagenomic read recruitment) to have relative abundances that ranged over seven orders of magnitude, with limited temporal reordering of rank abundances along with little change in richness. Seasonal variations in viral community composition were superimposed on the overall stability; maximum community similarity occurred at 12-month intervals. Despite the stability of viral genotypic clusters that had 98% sequence identity, viral sequences showed transient variations in single-nucleotide polymorphisms (SNPs) and constant turnover of minor population variants, each rising and falling over a few months, reminiscent of Red Queen dynamics4. The rise and fall of variants within populations, interpreted through the perspective of known virus-host interactions5, is consistent with the hypothesis that fluctuating selection acts on a microdiverse cloud of strains, and this succession is associated with ever-shifting virus-host defences and counterdefences. This results in long-term virus-host coexistence that is facilitated by perpetually changing minor variants.
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Affiliation(s)
| | - Nathan A Ahlgren
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA.,Department of Biology, Clark University, Worcester, MA, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA.
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18
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Gómez-Consarnau L, Raven JA, Levine NM, Cutter LS, Wang D, Seegers B, Arístegui J, Fuhrman JA, Gasol JM, Sañudo-Wilhelmy SA. Microbial rhodopsins are major contributors to the solar energy captured in the sea. Sci Adv 2019; 5:eaaw8855. [PMID: 31457093 PMCID: PMC6685716 DOI: 10.1126/sciadv.aaw8855] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 06/28/2019] [Indexed: 05/19/2023]
Abstract
All known phototrophic metabolisms on Earth rely on one of three categories of energy-converting pigments: chlorophyll-a (rarely -d), bacteriochlorophyll-a (rarely -b), and retinal, which is the chromophore in rhodopsins. While the significance of chlorophylls in solar energy capture has been studied for decades, the contribution of retinal-based phototrophy to this process remains largely unexplored. We report the first vertical distributions of the three energy-converting pigments measured along a contrasting nutrient gradient through the Mediterranean Sea and the Atlantic Ocean. The highest rhodopsin concentrations were observed above the deep chlorophyll-a maxima, and their geographical distribution tended to be inversely related to that of chlorophyll-a. We further show that proton-pumping proteorhodopsins potentially absorb as much light energy as chlorophyll-a-based phototrophy and that this energy is sufficient to sustain bacterial basal metabolism. This suggests that proteorhodopsins are a major energy-transducing mechanism to harvest solar energy in the surface ocean.
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Affiliation(s)
- Laura Gómez-Consarnau
- Departamento de Oceanografía Biológica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), 22860 Ensenada, Baja California, México
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - John A. Raven
- Division of Plant Science, University of Dundee at the James Hutton Institute, Invergowrie, Dundee DD2 5DA, UK
- Climate Change Cluster, University of Technology Sydney, Ultimo, NSW 2007, Australia
- School of Biological Sciences, University of Western Australia, 25 Stirling Highway, Crawley, WA 6009, Australia
| | - Naomi M. Levine
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Lynda S. Cutter
- Department of Earth Science, University of Southern California, Los Angeles, CA 90089, USA
| | - Deli Wang
- State Key Laboratory of Marine Environmental Science, Xiamen University, 422 Siming Nanlu, 361005 Xiamen, China
| | - Brian Seegers
- The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Javier Arístegui
- Instituto de Oceanografía y Cambio Global (IOCAG), Universidad de Las Palmas de Gran Canaria, 35017 Las Palmas de Gran Canaria, Spain
| | - Jed A. Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Josep M. Gasol
- Institut de Ciències del Mar-CSIC, ES-08003 Barcelona, Catalonia, Spain
- Centre for Marine Ecosystems Research, School of Science, Edith Cowan University, Joondalup, WA, Australia
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19
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Paterson JS, Smith RJ, McKerral JC, Dann LM, Launer E, Goonan P, Kleinig T, Fuhrman JA, Mitchell JG. A hydrocarbon-contaminated aquifer reveals a Piggyback-the-Persistent viral strategy. FEMS Microbiol Ecol 2019; 95:5533318. [PMID: 31314089 DOI: 10.1093/femsec/fiz116] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 07/16/2019] [Indexed: 11/14/2022] Open
Abstract
Subsurface environments hold the largest reservoir of microbes in the biosphere. They play essential roles in transforming nutrients, degrading contaminants and recycling organic matter. Here, we propose a previously unrecognised fundamental microbial process that influences aquifer bioremediation dynamics and that applies to all microbial communities. In contrast to previous models, our proposed Piggyback-the-Persistent (PtP) mechanism occurs when viruses become more dominated by those exhibiting temperate rather than lytic lifestyles driven by persistent chemicals (in our case chlorinated-hydrocarbon pollutants) that provide long-term carbon sources and that refocus the aquifer carbon cycle, thus altering the microbial community. In this ultra-oligotrophic system, the virus:microbial ratio (VMR) ranges from below the detection limit of 0.0001 to 0.6, well below the common aquatic range of 3-10. Shortest-average-path network analysis revealed VMR and trichlorethene (TCE) as nodes through which ecosystem information and biomass most efficiently pass. Novel network rearrangement revealed a hierarchy of Kill-the-Winner (KtW), Piggyback-the-Winner (PtW) and PtP nodes. We propose that KtW, PtW and PtP occur simultaneously as competing strategies, with their relative importance depending on conditions at a particular time and location with unusual nutrient sources, such as TCE, appearing to contribute to a shift in this balance between viral mechanisms.
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Affiliation(s)
- James S Paterson
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - Renee J Smith
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia.,College of Medicine and Public Health, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - Jody C McKerral
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - Lisa M Dann
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - Elise Launer
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - Peter Goonan
- South Australia Environment Protection Authority, GPO Box 2607, Adelaide, SA 5001, Australia
| | - Tavis Kleinig
- South Australia Environment Protection Authority, GPO Box 2607, Adelaide, SA 5001, Australia
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA 90089, USA
| | - James G Mitchell
- College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
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20
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Lu YY, Tang K, Ren J, Fuhrman JA, Waterman MS, Sun F. CAFE: aCcelerated Alignment-FrEe sequence analysis. Nucleic Acids Res 2019; 45:W554-W559. [PMID: 28472388 PMCID: PMC5793812 DOI: 10.1093/nar/gkx351] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 04/20/2017] [Indexed: 12/13/2022] Open
Abstract
Alignment-free genome and metagenome comparisons are increasingly important with the development of next generation sequencing (NGS) technologies. Recently developed state-of-the-art k-mer based alignment-free dissimilarity measures including CVTree, \documentclass[12pt]{minimal}
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}{}$d_2^S$\end{document} are more computationally expensive than measures based solely on the k-mer frequencies. Here, we report a standalone software, aCcelerated Alignment-FrEe sequence analysis (CAFE), for efficient calculation of 28 alignment-free dissimilarity measures. CAFE allows for both assembled genome sequences and unassembled NGS shotgun reads as input, and wraps the output in a standard PHYLIP format. In downstream analyses, CAFE can also be used to visualize the pairwise dissimilarity measures, including dendrograms, heatmap, principal coordinate analysis and network display. CAFE serves as a general k-mer based alignment-free analysis platform for studying the relationships among genomes and metagenomes, and is freely available at https://github.com/younglululu/CAFE.
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Affiliation(s)
- Yang Young Lu
- Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, CA 90089, USA
| | - Kujin Tang
- Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, CA 90089, USA
| | - Jie Ren
- Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, CA 90089, USA
| | - Jed A Fuhrman
- Department of Biological Sciences and Wrigley Institute for Environmental Studies, University of Southern California, Los Angeles, CA 90089, USA
| | - Michael S Waterman
- Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, CA 90089, USA.,Centre for Computational Systems Biology, School of Mathematical Sciences, Fudan University, 200433 Shanghai, China
| | - Fengzhu Sun
- Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, CA 90089, USA.,Centre for Computational Systems Biology, School of Mathematical Sciences, Fudan University, 200433 Shanghai, China
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21
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Ahlgren NA, Perelman JN, Yeh YC, Fuhrman JA. Multi-year dynamics of fine-scale marine cyanobacterial populations are more strongly explained by phage interactions than abiotic, bottom-up factors. Environ Microbiol 2019; 21:2948-2963. [PMID: 31106939 DOI: 10.1111/1462-2920.14687] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 03/29/2019] [Accepted: 04/16/2019] [Indexed: 12/01/2022]
Abstract
Currently defined ecotypes in marine cyanobacteria Prochlorococcus and Synechococcus likely contain subpopulations that themselves are ecologically distinct. We developed and applied high-throughput sequencing for the 16S-23S rRNA internally transcribed spacer (ITS) to examine ecotype and fine-scale genotypic community dynamics for monthly surface water samples spanning 5 years at the San Pedro Ocean Time-series site. Ecotype-level structure displayed regular seasonal patterns including succession, consistent with strong forcing by seasonally varying abiotic parameters (e.g. temperature, nutrients, light). We identified tens to thousands of amplicon sequence variants (ASVs) within ecotypes, many of which exhibited distinct patterns over time, suggesting ecologically distinct populations within ecotypes. Community structure within some ecotypes exhibited regular, seasonal patterns, but not for others, indicating other more irregular processes such as phage interactions are important. Network analysis including T4-like phage genotypic data revealed distinct viral variants correlated with different groups of cyanobacterial ASVs including time-lagged predator-prey relationships. Variation partitioning analysis indicated that phage community structure more strongly explains cyanobacterial community structure at the ASV level than the abiotic environmental factors. These results support a hierarchical model whereby abiotic environmental factors more strongly shape niche partitioning at the broader ecotype level while phage interactions are more important in shaping community structure of fine-scale variants within ecotypes.
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Affiliation(s)
- Nathan A Ahlgren
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Jessica N Perelman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Yi-Chun Yeh
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
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Gómez-Consarnau L, Needham DM, Weber PK, Fuhrman JA, Mayali X. Influence of Light on Particulate Organic Matter Utilization by Attached and Free-Living Marine Bacteria. Front Microbiol 2019; 10:1204. [PMID: 31214143 PMCID: PMC6558058 DOI: 10.3389/fmicb.2019.01204] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 05/13/2019] [Indexed: 11/13/2022] Open
Abstract
Light plays a central role on primary productivity of aquatic systems. Yet, its potential impact on the degradation of photosynthetically produced biomass is not well understood. We investigated the patterns of light-induced particle breakdown and bacterial assimilation of detrital C and N using 13C and 15N labeled freeze-thawed diatom cells incubated in laboratory microcosms with a marine microbial community freshly collected from the Pacific Ocean. Particles incubated in the dark resulted in increased bacterial counts and dissolved organic carbon concentrations compared to those incubated in the light. Light also influenced the attached and free-living microbial community structure as detected by 16S rRNA gene amplicon sequencing. For example, Sphingobacteriia were enriched on dark-incubated particles and taxa from the family Flavobacteriaceae and the genus Pseudoalteromonas were numerically enriched on particles in the light. Isotope incorporation analysis by phylogenetic microarray and NanoSIMS (a method called Chip-SIP) identified free-living and attached microbial taxa able to incorporate N and C from the particles. Some taxa, including members of the Flavobacteriaceae and Cryomorphaceae, exhibited increased isotope incorporation in the light, suggesting the use of photoheterotrophic metabolisms. In contrast, some members of Oceanospirillales and Rhodospirillales showed decreased isotope incorporation in the light, suggesting that their heterotrophic metabolism, particularly when occurring on particles, might increase at night or may be inhibited by sunlight. These results show that light influences particle degradation and C and N incorporation by attached bacteria, suggesting that the transfer between particulate and free-living phases are likely affected by external factors that change with the light regime, such as time of day, water column depth and season.
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Affiliation(s)
- Laura Gómez-Consarnau
- Departamento de Oceanografía Biológica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Mexico.,Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States
| | - David M Needham
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States
| | - Peter K Weber
- Lawrence Livermore National Laboratory, Livermore, CA, United States
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States
| | - Xavier Mayali
- Lawrence Livermore National Laboratory, Livermore, CA, United States
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23
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Roux S, Trubl G, Goudeau D, Nath N, Couradeau E, Ahlgren NA, Zhan Y, Marsan D, Chen F, Fuhrman JA, Northen TR, Sullivan MB, Rich VI, Malmstrom RR, Eloe-Fadrosh EA. Optimizing de novo genome assembly from PCR-amplified metagenomes. PeerJ 2019; 7:e6902. [PMID: 31119088 PMCID: PMC6511391 DOI: 10.7717/peerj.6902] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 04/03/2019] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Metagenomics has transformed our understanding of microbial diversity across ecosystems, with recent advances enabling de novo assembly of genomes from metagenomes. These metagenome-assembled genomes are critical to provide ecological, evolutionary, and metabolic context for all the microbes and viruses yet to be cultivated. Metagenomes can now be generated from nanogram to subnanogram amounts of DNA. However, these libraries require several rounds of PCR amplification before sequencing, and recent data suggest these typically yield smaller and more fragmented assemblies than regular metagenomes. METHODS Here we evaluate de novo assembly methods of 169 PCR-amplified metagenomes, including 25 for which an unamplified counterpart is available, to optimize specific assembly approaches for PCR-amplified libraries. We first evaluated coverage bias by mapping reads from PCR-amplified metagenomes onto reference contigs obtained from unamplified metagenomes of the same samples. Then, we compared different assembly pipelines in terms of assembly size (number of bp in contigs ≥ 10 kb) and error rates to evaluate which are the best suited for PCR-amplified metagenomes. RESULTS Read mapping analyses revealed that the depth of coverage within individual genomes is significantly more uneven in PCR-amplified datasets versus unamplified metagenomes, with regions of high depth of coverage enriched in short inserts. This enrichment scales with the number of PCR cycles performed, and is presumably due to preferential amplification of short inserts. Standard assembly pipelines are confounded by this type of coverage unevenness, so we evaluated other assembly options to mitigate these issues. We found that a pipeline combining read deduplication and an assembly algorithm originally designed to recover genomes from libraries generated after whole genome amplification (single-cell SPAdes) frequently improved assembly of contigs ≥10 kb by 10 to 100-fold for low input metagenomes. CONCLUSIONS PCR-amplified metagenomes have enabled scientists to explore communities traditionally challenging to describe, including some with extremely low biomass or from which DNA is particularly difficult to extract. Here we show that a modified assembly pipeline can lead to an improved de novo genome assembly from PCR-amplified datasets, and enables a better genome recovery from low input metagenomes.
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Affiliation(s)
- Simon Roux
- Department of Energy Joint Genome Institute, Walnut Creek, CA, United States of America
| | - Gareth Trubl
- Department of Microbiology, Ohio State University, Columbus, OH, United States of America
| | - Danielle Goudeau
- Department of Energy Joint Genome Institute, Walnut Creek, CA, United States of America
| | - Nandita Nath
- Department of Energy Joint Genome Institute, Walnut Creek, CA, United States of America
| | - Estelle Couradeau
- Environmental Genomics and Systems Biology, Lawrence Berkeley National Laboratory, Berkeley, CA, United States of America
| | - Nathan A. Ahlgren
- Department of Biology, Clark University, Worcester, MA, United States of America
| | - Yuanchao Zhan
- Institution of Marine and Environmental Technology, University of Maryland Center for Environmental Science, Cambridge, MD, United States of America
| | - David Marsan
- Institution of Marine and Environmental Technology, University of Maryland Center for Environmental Science, Cambridge, MD, United States of America
| | - Feng Chen
- Institution of Marine and Environmental Technology, University of Maryland Center for Environmental Science, Cambridge, MD, United States of America
| | - Jed A. Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States of America
| | - Trent R. Northen
- Department of Energy Joint Genome Institute, Walnut Creek, CA, United States of America
| | - Matthew B. Sullivan
- Department of Microbiology, Ohio State University, Columbus, OH, United States of America
- Department of Civil, Environmental and Geodetic Engineering, Ohio State University, Columbus, OH, United States of America
| | - Virginia I. Rich
- Department of Microbiology, Ohio State University, Columbus, OH, United States of America
| | - Rex R. Malmstrom
- Department of Energy Joint Genome Institute, Walnut Creek, CA, United States of America
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24
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Hernando-Morales V, Varela MM, Needham DM, Cram J, Fuhrman JA, Teira E. Vertical and Seasonal Patterns Control Bacterioplankton Communities at Two Horizontally Coherent Coastal Upwelling Sites off Galicia (NW Spain). Microb Ecol 2018; 76:866-884. [PMID: 29675703 DOI: 10.1007/s00248-018-1179-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Accepted: 03/14/2018] [Indexed: 06/08/2023]
Abstract
Analysis of seasonal patterns of marine bacterial community structure along horizontal and vertical spatial scales can help to predict long-term responses to climate change. Several recent studies have shown predictable seasonal reoccurrence of bacterial assemblages. However, only a few have assessed temporal variability over both horizontal and vertical spatial scales. Here, we simultaneously studied the bacterial community structure at two different locations and depths in shelf waters of a coastal upwelling system during an annual cycle. The most noticeable biogeographic patterns observed were seasonality, horizontal homogeneity, and spatial synchrony in bacterial diversity and community structure related with regional upwelling-downwelling dynamics. Water column mixing eventually disrupted bacterial community structure vertical heterogeneity. Our results are consistent with previous temporal studies of marine bacterioplankton in other temperate regions and also suggest a marked influence of regional factors on the bacterial communities inhabiting this coastal upwelling system. Bacterial-mediated carbon fluxes in this productive region appear to be mainly controlled by community structure dynamics in surface waters, and local environmental factors at the base of the euphotic zone.
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Affiliation(s)
- Víctor Hernando-Morales
- Grupo de Oceanografía Biolóxica, Departamento de Ecoloxía e Bioloxía Animal, Universidade de Vigo, 36310, Vigo, Spain.
- Estación de Ciencias Mariñas de Toralla (ECIMAT), Universidade de Vigo, Illa de Toralla, 36331, Vigo, Spain.
| | - Marta M Varela
- IEO, Instituto Español de Oceanografía, Centro Oceanográfico de A Coruña, Apdo 130, 15080, A Coruña, Spain
| | - David M Needham
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, 90089-0371, USA
| | - Jacob Cram
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, 90089-0371, USA
- School of Oceanography, University of Washington, Seattle, WA, 98195, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, 90089-0371, USA
| | - Eva Teira
- Grupo de Oceanografía Biolóxica, Departamento de Ecoloxía e Bioloxía Animal, Universidade de Vigo, 36310, Vigo, Spain
- Estación de Ciencias Mariñas de Toralla (ECIMAT), Universidade de Vigo, Illa de Toralla, 36331, Vigo, Spain
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25
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Sieradzki ET, Fuhrman JA, Rivero-Calle S, Gómez-Consarnau L. Proteorhodopsins dominate the expression of phototrophic mechanisms in seasonal and dynamic marine picoplankton communities. PeerJ 2018; 6:e5798. [PMID: 30370186 PMCID: PMC6202958 DOI: 10.7717/peerj.5798] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Accepted: 09/20/2018] [Indexed: 12/13/2022] Open
Abstract
The most abundant and ubiquitous microbes in the surface ocean use light as an energy source, capturing it via complex chlorophyll-based photosystems or simple retinal-based rhodopsins. Studies in various ocean regimes compared the abundance of these mechanisms, but few investigated their expression. Here we present the first full seasonal study of abundance and expression of light-harvesting mechanisms (proteorhodopsin, PR; aerobic anoxygenic photosynthesis, AAnP; and oxygenic photosynthesis, PSI) from deep-sequenced metagenomes and metatranscriptomes of marine picoplankton (<1 µm) at three coastal stations of the San Pedro Channel in the Pacific Ocean. We show that, regardless of season or sampling location, the most common phototrophic mechanism in metagenomes of this dynamic region was PR (present in 65–104% of the genomes as estimated by single-copy recA), followed by PSI (5–104%) and AAnP (5–32%). Furthermore, the normalized expression (RNA to DNA ratio) of PR genes was higher than that of oxygenic photosynthesis (average ± standard deviation 26.2 ± 8.4 vs. 11 ± 9.7), and the expression of the AAnP marker gene was significantly lower than both mechanisms (0.013 ± 0.02). We demonstrate that PR expression was dominated by the SAR11-cluster year-round, followed by other Alphaproteobacteria, unknown-environmental clusters and Gammaproteobacteria. This highly dynamic system further allowed us to identify a trend for PR spectral tuning, in which blue-absorbing PR genes dominate in areas with low chlorophyll-a concentrations (<0.25 µgL−1). This suggests that PR phototrophy is not an accessory function but instead a central mechanism that can regulate photoheterotrophic population dynamics.
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Affiliation(s)
- Ella T Sieradzki
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States of America
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States of America
| | - Sara Rivero-Calle
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States of America
| | - Laura Gómez-Consarnau
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States of America
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26
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Ahlgren NA, Fuchsman CA, Rocap G, Fuhrman JA. Discovery of several novel, widespread, and ecologically distinct marine Thaumarchaeota viruses that encode amoC nitrification genes. ISME J 2018; 13:618-631. [PMID: 30315316 DOI: 10.1038/s41396-018-0289-4] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 06/15/2018] [Accepted: 09/19/2018] [Indexed: 12/22/2022]
Abstract
Much of the diversity of prokaryotic viruses has yet to be described. In particular, there are no viral isolates that infect abundant, globally significant marine archaea including the phylum Thaumarchaeota. This phylum oxidizes ammonia, fixes inorganic carbon, and thus contributes to globally significant nitrogen and carbon cycles in the oceans. Metagenomics provides an alternative to culture-dependent means for identifying and characterizing viral diversity. Some viruses carry auxiliary metabolic genes (AMGs) that are acquired via horizontal gene transfer from their host(s), allowing inference of what host a virus infects. Here we present the discovery of 15 new genomically and ecologically distinct Thaumarchaeota virus populations, identified as contigs that encode viral capsid and thaumarchaeal ammonia monooxygenase genes (amoC). These viruses exhibit depth and latitude partitioning and are distributed globally in various marine habitats including pelagic waters, estuarine habitats, and hydrothermal plume water and sediments. We found evidence of viral amoC expression and that viral amoC AMGs sometimes comprise up to half of total amoC DNA copies in cellular fraction metagenomes, highlighting the potential impact of these viruses on N cycling in the oceans. Phylogenetics suggest they are potentially tailed viruses and share a common ancestor with related marine Euryarchaeota viruses. This work significantly expands our view of viruses of globally important marine Thaumarchaeota.
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Affiliation(s)
- Nathan A Ahlgren
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA. .,Clark University, Worcester, MA, USA.
| | - Clara A Fuchsman
- School of Oceanography, University of Washington, Seattle, WA, USA.,Horn Point Laboratory, University of Maryland, Cambridge, MD, USA
| | - Gabrielle Rocap
- School of Oceanography, University of Washington, Seattle, WA, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
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27
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Needham DM, Fichot EB, Wang E, Berdjeb L, Cram JA, Fichot CG, Fuhrman JA. Dynamics and interactions of highly resolved marine plankton via automated high-frequency sampling. ISME J 2018; 12:2417-2432. [PMID: 29899514 PMCID: PMC6155038 DOI: 10.1038/s41396-018-0169-y] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 03/17/2018] [Accepted: 03/20/2018] [Indexed: 11/09/2022]
Abstract
Short timescale observations are valuable for understanding microbial ecological processes. We assessed dynamics in relative abundance and potential activities by sequencing the small sub-unit ribosomal RNA gene (rRNA gene) and rRNA molecules (rRNA) of Bacteria, Archaea, and Eukaryota once to twice daily between March 2014 and May 2014 from the surface ocean off Catalina Island, California. Typically Ostreococcus, Braarudosphaera, Teleaulax, and Synechococcus dominated phytoplankton sequences (including chloroplasts) while SAR11, Sulfitobacter, and Fluviicola dominated non-phytoplankton Bacteria and Archaea. We observed short-lived increases of diatoms, mostly Pseudo-nitzschia and Chaetoceros, with quickly responding Bacteria and Archaea including Flavobacteriaceae (Polaribacter & Formosa), Roseovarius, and Euryarchaeota (MGII), notably the exact amplicon sequence variants we observed responding similarly to another diatom bloom nearby, 3 years prior. We observed correlations representing known interactions among abundant phytoplankton rRNA sequences, demonstrating the biogeochemical and ecological relevance of such interactions: (1) The kleptochloroplastidic ciliate Mesodinium 18S rRNA gene sequences and a single Teleaulax taxon (via 16S rRNA gene sequences) were correlated (Spearman r = 0.83) yet uncorrelated to a Teleaulax 18S rRNA gene OTU, or any other taxon (consistent with a kleptochloroplastidic or karyokleptic relationship) and (2) the photosynthetic prymnesiophyte Braarudosphaera bigelowii and two strains of diazotrophic cyanobacterium UCYN-A were correlated and each taxon was also correlated to other taxa, including B. bigelowii to a verrucomicrobium and a dictyochophyte phytoplankter (all r > 0.8). We also report strong correlations (r > 0.7) between various ciliates, bacteria, and phytoplankton, suggesting interactions via currently unknown mechanisms. These data reiterate the utility of high-frequency time series to show rapid microbial reactions to stimuli, and provide new information about in situ dynamics of previously recognized and hypothesized interactions.
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Affiliation(s)
- David M Needham
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA.
| | - Erin B Fichot
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Ellice Wang
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Lyria Berdjeb
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Jacob A Cram
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Cédric G Fichot
- Department of Earth and Environment, Boston University, Boston, MA, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
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28
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Gómez-Consarnau L, Sachdeva R, Gifford SM, Cutter LS, Fuhrman JA, Sañudo-Wilhelmy SA, Moran MA. Mosaic patterns of B-vitamin synthesis and utilization in a natural marine microbial community. Environ Microbiol 2018; 20:2809-2823. [PMID: 29659156 DOI: 10.1111/1462-2920.14133] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 04/05/2018] [Indexed: 12/28/2022]
Abstract
Aquatic environments contain large communities of microorganisms whose synergistic interactions mediate the cycling of major and trace nutrients, including vitamins. B-vitamins are essential coenzymes that many organisms cannot synthesize. Thus, their exchange among de novo synthesizers and auxotrophs is expected to play an important role in the microbial consortia and explain some of the temporal and spatial changes observed in diversity. In this study, we analyzed metatranscriptomes of a natural marine microbial community, diel sampled quarterly over one year to try to identify the potential major B-vitamin synthesizers and consumers. Transcriptomic data showed that the best-represented taxa dominated the expression of synthesis genes for some B-vitamins but lacked transcripts for others. For instance, Rhodobacterales dominated the expression of vitamin-B12 synthesis, but not of vitamin-B7 , whose synthesis transcripts were mainly represented by Flavobacteria. In contrast, bacterial groups that constituted less than 4% of the community (e.g., Verrucomicrobia) accounted for most of the vitamin-B1 synthesis transcripts. Furthermore, ambient vitamin-B1 concentrations were higher in samples collected during the day, and were positively correlated with chlorophyll-a concentrations. Our analysis supports the hypothesis that the mosaic of metabolic interdependencies through B-vitamin synthesis and exchange are key processes that contribute to shaping microbial communities in nature.
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Affiliation(s)
- Laura Gómez-Consarnau
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA.,Departamento de Oceanografía Biológica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, 22860, Mexico
| | - Rohan Sachdeva
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Scott M Gifford
- Department of Marine Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Lynda S Cutter
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Sergio A Sañudo-Wilhelmy
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA.,Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Mary Ann Moran
- Department of Marine Sciences, University of Georgia, Athens, GA 30602, USA
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30
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Berdjeb L, Parada A, Needham DM, Fuhrman JA. Short-term dynamics and interactions of marine protist communities during the spring-summer transition. ISME J 2018; 12:1907-1917. [PMID: 29599520 DOI: 10.1038/s41396-018-0097-x] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 02/15/2018] [Accepted: 02/26/2018] [Indexed: 11/09/2022]
Abstract
We examined the short-term variability, by daily to weekly sampling, of protist assemblages from March to July in surface water of the San Pedro Ocean Time-series station (eastern North Pacific), by V4 Illumina sequencing of the 18S rRNA gene. The sampling period encompassed a spring bloom followed by progression to summer conditions. Several protistan taxa displayed sharp increases and declines, with whole community Bray-Curtis dissimilarities of adjacent days being 66% in March and 40% in May. High initial abundance of parasitic Cercozoa Cryothecomonas longipes and Protaspis grandis coincided with a precipitous decline of blooming Pseudo-nitzschia diatoms, possibly suggesting their massive infection by these parasites; these cercozoans were hardly detectable afterwards. Canonical correspondence analysis indicated a limited predictability of community variability from environmental factors. This indicates that other factors are relevant in explaining changes in protist community composition at short temporal scales, such as interspecific relationships, stochastic processes, mixing with adjacent water, or advection of patches with different protist communities. Association network analysis revealed that interactions between the many parasitic OTUs and other taxa were overwhelmingly positive and suggest that although sometimes parasites may cause a crash of host populations, they may often follow their hosts and do not regularly cause enough mortality to potentially create negative correlations at the daily to weekly time scales we studied.
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Affiliation(s)
- Lyria Berdjeb
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Alma Parada
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - David M Needham
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA.
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31
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Lu YY, Lv J, Fuhrman JA, Sun F. Towards enhanced and interpretable clustering/classification in integrative genomics. Nucleic Acids Res 2017; 45:e169. [PMID: 28977511 PMCID: PMC5714251 DOI: 10.1093/nar/gkx767] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 08/21/2017] [Indexed: 11/30/2022] Open
Abstract
High-throughput technologies have led to large collections of different types of biological data that provide unprecedented opportunities to unravel molecular heterogeneity of biological processes. Nevertheless, how to jointly explore data from multiple sources into a holistic, biologically meaningful interpretation remains challenging. In this work, we propose a scalable and tuning-free preprocessing framework, Heterogeneity Rescaling Pursuit (Hetero-RP), which weighs important features more highly than less important ones in accord with implicitly existing auxiliary knowledge. Finally, we demonstrate effectiveness of Hetero-RP in diverse clustering and classification applications. More importantly, Hetero-RP offers an interpretation of feature importance, shedding light on the driving forces of the underlying biology. In metagenomic contig binning, Hetero-RP automatically weighs abundance and composition profiles according to the varying number of samples, resulting in markedly improved performance of contig binning. In RNA-binding protein (RBP) binding site prediction, Hetero-RP not only improves the prediction performance measured by the area under the receiver operating characteristic curves (AUC), but also uncovers the evidence supported by independent studies, including the distribution of the binding sites of IGF2BP and PUM2, the binding competition between hnRNPC and U2AF2, and the intron–exon boundary of U2AF2 [availability: https://github.com/younglululu/Hetero-RP].
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Affiliation(s)
- Yang Young Lu
- Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, CA, USA
| | - Jinchi Lv
- Data Sciences and Operations Department, Marshall School of Business, University of Southern California, CA, USA
| | - Jed A Fuhrman
- Department of Biological Sciences and Wrigley Institute for Environmental Studies, University of Southern California, Los Angeles, CA, USA
| | - Fengzhu Sun
- Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, CA, USA.,Centre for Computational Systems Biology, School of Mathematical Sciences, Fudan University, Shanghai, China
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32
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Lu YY, Chen T, Fuhrman JA, Sun F. COCACOLA: binning metagenomic contigs using sequence COmposition, read CoverAge, CO-alignment and paired-end read LinkAge. Bioinformatics 2017; 33:791-798. [PMID: 27256312 DOI: 10.1093/bioinformatics/btw290] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 04/29/2016] [Indexed: 02/04/2023] Open
Abstract
Motivation The advent of next-generation sequencing technologies enables researchers to sequence complex microbial communities directly from the environment. Because assembly typically produces only genome fragments, also known as contigs, instead of an entire genome, it is crucial to group them into operational taxonomic units (OTUs) for further taxonomic profiling and down-streaming functional analysis. OTU clustering is also referred to as binning. We present COCACOLA, a general framework automatically bin contigs into OTUs based on sequence composition and coverage across multiple samples. Results The effectiveness of COCACOLA is demonstrated in both simulated and real datasets in comparison with state-of-art binning approaches such as CONCOCT, GroopM, MaxBin and MetaBAT. The superior performance of COCACOLA relies on two aspects. One is using L 1 distance instead of Euclidean distance for better taxonomic identification during initialization. More importantly, COCACOLA takes advantage of both hard clustering and soft clustering by sparsity regularization. In addition, the COCACOLA framework seamlessly embraces customized knowledge to facilitate binning accuracy. In our study, we have investigated two types of additional knowledge, the co-alignment to reference genomes and linkage of contigs provided by paired-end reads, as well as the ensemble of both. We find that both co-alignment and linkage information further improve binning in the majority of cases. COCACOLA is scalable and faster than CONCOCT, GroopM, MaxBin and MetaBAT. Availability and implementation The software is available at https://github.com/younglululu/COCACOLA . Contact fsun@usc.edu. Supplementary information Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Yang Young Lu
- Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Ting Chen
- Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA.,Center for Synthetic and Systems Biology, TNLIST, Beijing, China
| | - Jed A Fuhrman
- Department of Biological Sciences and Wrigley Institute for Environmental Studies, University of Southern California, Los Angeles, CA, USA
| | - Fengzhu Sun
- Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA.,Center for Computational Systems Biology, Fudan University, Shanghai, China
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Thompson LR, Sanders JG, McDonald D, Amir A, Ladau J, Locey KJ, Prill RJ, Tripathi A, Gibbons SM, Ackermann G, Navas-Molina JA, Janssen S, Kopylova E, Vázquez-Baeza Y, González A, Morton JT, Mirarab S, Zech Xu Z, Jiang L, Haroon MF, Kanbar J, Zhu Q, Jin Song S, Kosciolek T, Bokulich NA, Lefler J, Brislawn CJ, Humphrey G, Owens SM, Hampton-Marcell J, Berg-Lyons D, McKenzie V, Fierer N, Fuhrman JA, Clauset A, Stevens RL, Shade A, Pollard KS, Goodwin KD, Jansson JK, Gilbert JA, Knight R. A communal catalogue reveals Earth's multiscale microbial diversity. Nature 2017; 551:457-463. [PMID: 29088705 PMCID: PMC6192678 DOI: 10.1038/nature24621] [Citation(s) in RCA: 1219] [Impact Index Per Article: 174.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 10/10/2017] [Indexed: 02/07/2023]
Abstract
Our growing awareness of the microbial world's importance and diversity contrasts starkly with our limited understanding of its fundamental structure. Despite recent advances in DNA sequencing, a lack of standardized protocols and common analytical frameworks impedes comparisons among studies, hindering the development of global inferences about microbial life on Earth. Here we present a meta-analysis of microbial community samples collected by hundreds of researchers for the Earth Microbiome Project. Coordinated protocols and new analytical methods, particularly the use of exact sequences instead of clustered operational taxonomic units, enable bacterial and archaeal ribosomal RNA gene sequences to be followed across multiple studies and allow us to explore patterns of diversity at an unprecedented scale. The result is both a reference database giving global context to DNA sequence data and a framework for incorporating data from future studies, fostering increasingly complete characterization of Earth's microbial diversity.
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Affiliation(s)
- Luke R Thompson
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA.,Department of Biological Sciences and Northern Gulf Institute, University of Southern Mississippi, Hattiesburg, Mississippi, USA.,Ocean Chemistry and Ecosystems Division, Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration, stationed at Southwest Fisheries Science Center, La Jolla, California, USA
| | - Jon G Sanders
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Daniel McDonald
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Amnon Amir
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Joshua Ladau
- The Gladstone Institutes and University of California San Francisco, San Francisco, California, USA
| | - Kenneth J Locey
- Department of Biology, Indiana University, Bloomington, Indiana, USA
| | - Robert J Prill
- Industrial and Applied Genomics, IBM Almaden Research Center, San Jose, California, USA
| | - Anupriya Tripathi
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA.,Division of Biological Sciences, University of California San Diego, La Jolla, California, USA.,Skaggs School of Pharmacy, University of California San Diego, La Jolla, California, USA
| | - Sean M Gibbons
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.,The Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
| | - Gail Ackermann
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Jose A Navas-Molina
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA.,Department of Computer Science and Engineering, University of California San Diego, La Jolla, California, USA
| | - Stefan Janssen
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Evguenia Kopylova
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Yoshiki Vázquez-Baeza
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA.,Department of Computer Science and Engineering, University of California San Diego, La Jolla, California, USA
| | - Antonio González
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - James T Morton
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA.,Department of Computer Science and Engineering, University of California San Diego, La Jolla, California, USA
| | - Siavash Mirarab
- Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, California, USA
| | - Zhenjiang Zech Xu
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Lingjing Jiang
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA.,Department of Family Medicine and Public Health, University of California San Diego, La Jolla, California, USA
| | - Mohamed F Haroon
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, USA
| | - Jad Kanbar
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Qiyun Zhu
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Se Jin Song
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Tomasz Kosciolek
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Nicholas A Bokulich
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, Arizona, USA
| | - Joshua Lefler
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Colin J Brislawn
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington, USA
| | - Gregory Humphrey
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA
| | - Sarah M Owens
- Biosciences Division, Argonne National Laboratory, Argonne, Illinois, USA
| | - Jarrad Hampton-Marcell
- Biosciences Division, Argonne National Laboratory, Argonne, Illinois, USA.,Department of Biological Sciences, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Donna Berg-Lyons
- BioFrontiers Institute, University of Colorado, Boulder, Colorado, USA
| | - Valerie McKenzie
- Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado, USA
| | - Noah Fierer
- Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, California, USA
| | - Aaron Clauset
- BioFrontiers Institute, University of Colorado, Boulder, Colorado, USA.,Department of Computer Science, University of Colorado, Boulder, Colorado, USA
| | - Rick L Stevens
- Computing, Environment and Life Sciences, Argonne National Laboratory, Argonne, Illinois, USA.,Department of Computer Science, University of Chicago, Chicago, Illinois, USA
| | - Ashley Shade
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA.,Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan, USA.,Program in Ecology, Evolutionary Biology and Behavior, Michigan State University, East Lansing, Michigan, USA
| | - Katherine S Pollard
- The Gladstone Institutes and University of California San Francisco, San Francisco, California, USA
| | - Kelly D Goodwin
- Ocean Chemistry and Ecosystems Division, Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration, stationed at Southwest Fisheries Science Center, La Jolla, California, USA
| | - Janet K Jansson
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington, USA
| | - Jack A Gilbert
- Biosciences Division, Argonne National Laboratory, Argonne, Illinois, USA.,Department of Surgery, University of Chicago, Chicago, Illinois, USA
| | - Rob Knight
- Department of Pediatrics, University of California San Diego, La Jolla, California, USA.,Department of Computer Science and Engineering, University of California San Diego, La Jolla, California, USA.,Center for Microbiome Innovation, University of California San Diego, La Jolla, California, USA
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Wigington CH, Sonderegger D, Brussaard CPD, Buchan A, Finke JF, Fuhrman JA, Lennon JT, Middelboe M, Suttle CA, Stock C, Wilson WH, Wommack KE, Wilhelm SW, Weitz JS. Author Correction: Re-examination of the relationship between marine virus and microbial cell abundances. Nat Microbiol 2017; 2:1571. [PMID: 28974689 DOI: 10.1038/s41564-017-0042-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The original publication of this Article included analysis of virus and microbial cell abundances and virus-to-microbial cell ratios. Data in the Article came from 25 studies intended to be exclusively from marine sites. However, 3 of the studies included in the original unified dataset were erroneously classified as marine sites during compilation. The records with mis-recorded longitude and latitude values were, in fact, taken from inland, freshwater sources. The three inland, freshwater datasets are ELA, TROUT and SWAT. The data from these three studies represent 163 of the 5,671 records in the original publication. In the updated version of the Article, all analyses have been recalculated using the same statistical analysis pipeline released via GitHub as part of the original publication. Removal of the three studies reduces the unified dataset to 5,508 records. Analyses involving all grouped datasets have been updated with changes noted in each figure. All key results remain qualitatively unchanged. All data and scripts used in this correction have been made available as a new, updated GitHub release to reflect the updated dataset and figures.
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Affiliation(s)
- Charles H Wigington
- School of Biology, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA
| | - Derek Sonderegger
- Department of Mathematics and Statistics, Northern Arizona University, Flagstaff, Arizona, 86011, USA
| | - Corina P D Brussaard
- Department of Biological Oceanography, Royal Netherlands Institute for Sea Research (NIOZ), 1790 AB Den Burg, Texel, The Netherlands.,Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, 1090 GE, Amsterdam, The Netherlands
| | - Alison Buchan
- Department of Microbiology, The University of Tennessee, Knoxville, TN, 37996, USA
| | - Jan F Finke
- Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, 90089, USA
| | - Jay T Lennon
- Department of Biology, Indiana University, Bloomington, Indiana, 47405, USA
| | - Mathias Middelboe
- Marine Biological Section, Department of Biology, University of Copenhagen, DK-3000, Helsingør, Denmark
| | - Curtis A Suttle
- Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.,Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.,Department of Botany, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.,Program in Integrated Microbial Diversity, Canadian Institute for Advanced Research, Toronto, ON, M5G 1Z8, Canada
| | - Charles Stock
- Geophysical Fluid Dynamics Laboratory, Princeton, NJ, 08540, USA
| | - William H Wilson
- Sir Alister Hardy Foundation for Ocean Science, The Laboratory, Citadel Hill, Plymouth, PL1 2PB, UK
| | - K Eric Wommack
- Plant and Soil Sciences, Delaware Biotechnology Institute, Delaware Technology Park, Newark, DE, 19711, USA
| | - Steven W Wilhelm
- Department of Microbiology, The University of Tennessee, Knoxville, TN, 37996, USA
| | - Joshua S Weitz
- School of Biology, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA. .,School of Physics, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
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Parada AE, Fuhrman JA. Marine archaeal dynamics and interactions with the microbial community over 5 years from surface to seafloor. ISME J 2017; 11:2510-2525. [PMID: 28731479 DOI: 10.1038/ismej.2017.104] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 05/16/2016] [Accepted: 05/25/2017] [Indexed: 11/09/2022]
Abstract
Marine archaea are critical contributors to global carbon and nitrogen redox cycles, but their temporal variability and microbial associations across the water column are poorly known. We evaluated seasonal variability of free living (0.2-1 μm size fraction) Thaumarchaea Marine Group I (MGI) and Euryarchaea Marine Group II (MGII) communities and their associations with the microbial community from surface to seafloor (890 m) over 5 years by 16S rRNA V4-V5 gene sequencing. MGI and MGII communities demonstrated distinct compositions at different depths, and seasonality at all depths. Microbial association networks at 150 m, 500 m and 890 m, revealed diverse assemblages of MGI (presumed ammonia oxidizers) and Nitrospina taxa (presumed dominant nitrite oxidizers, completing the nitrification process), suggesting distinct MGI-Nitrospina OTUs are responsible for nitrification at different depths and seasons, and depth- related and seasonal variability in nitrification could be affected by alternating MGI-Nitrospina assemblages. MGII taxa also showed distinct correlations to possibly heterotrophic bacteria, most commonly to members of Marine Group A, Chloroflexi, Marine Group B, and SAR86. Thus, both MGI and MGII likely have dynamic associations with bacteria based on similarities in activity or other interactions that select for distinct microbial assemblages over time. The importance of MGII taxa as members of the heterotrophic community previously reported for photic zone appears to apply throughout the water column.
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Affiliation(s)
- Alma E Parada
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
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36
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Ren J, Ahlgren NA, Lu YY, Fuhrman JA, Sun F. VirFinder: a novel k-mer based tool for identifying viral sequences from assembled metagenomic data. Microbiome 2017. [PMID: 28683828 DOI: 10.1186/s40168-017-0283-285] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
BACKGROUND Identifying viral sequences in mixed metagenomes containing both viral and host contigs is a critical first step in analyzing the viral component of samples. Current tools for distinguishing prokaryotic virus and host contigs primarily use gene-based similarity approaches. Such approaches can significantly limit results especially for short contigs that have few predicted proteins or lack proteins with similarity to previously known viruses. METHODS We have developed VirFinder, the first k-mer frequency based, machine learning method for virus contig identification that entirely avoids gene-based similarity searches. VirFinder instead identifies viral sequences based on our empirical observation that viruses and hosts have discernibly different k-mer signatures. VirFinder's performance in correctly identifying viral sequences was tested by training its machine learning model on sequences from host and viral genomes sequenced before 1 January 2014 and evaluating on sequences obtained after 1 January 2014. RESULTS VirFinder had significantly better rates of identifying true viral contigs (true positive rates (TPRs)) than VirSorter, the current state-of-the-art gene-based virus classification tool, when evaluated with either contigs subsampled from complete genomes or assembled from a simulated human gut metagenome. For example, for contigs subsampled from complete genomes, VirFinder had 78-, 2.4-, and 1.8-fold higher TPRs than VirSorter for 1, 3, and 5 kb contigs, respectively, at the same false positive rates as VirSorter (0, 0.003, and 0.006, respectively), thus VirFinder works considerably better for small contigs than VirSorter. VirFinder furthermore identified several recently sequenced virus genomes (after 1 January 2014) that VirSorter did not and that have no nucleotide similarity to previously sequenced viruses, demonstrating VirFinder's potential advantage in identifying novel viral sequences. Application of VirFinder to a set of human gut metagenomes from healthy and liver cirrhosis patients reveals higher viral diversity in healthy individuals than cirrhosis patients. We also identified contig bins containing crAssphage-like contigs with higher abundance in healthy patients and a putative Veillonella genus prophage associated with cirrhosis patients. CONCLUSIONS This innovative k-mer based tool complements gene-based approaches and will significantly improve prokaryotic viral sequence identification, especially for metagenomic-based studies of viral ecology.
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Affiliation(s)
- Jie Ren
- Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA, 90089, USA
| | - Nathan A Ahlgren
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Pkwy, Los Angeles, CA, 90089, USA.
- Present address: Biology Department, Clark University, 950 Main St, Worcester, MA, 01610, USA.
| | - Yang Young Lu
- Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA, 90089, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Pkwy, Los Angeles, CA, 90089, USA
| | - Fengzhu Sun
- Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA, 90089, USA.
- Center for Computational Systems Biology, Fudan University, 200433, Shanghai, China.
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37
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Ren J, Ahlgren NA, Lu YY, Fuhrman JA, Sun F. VirFinder: a novel k-mer based tool for identifying viral sequences from assembled metagenomic data. Microbiome 2017; 5:69. [PMID: 28683828 PMCID: PMC5501583 DOI: 10.1186/s40168-017-0283-5] [Citation(s) in RCA: 299] [Impact Index Per Article: 42.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 06/05/2017] [Indexed: 05/19/2023]
Abstract
BACKGROUND Identifying viral sequences in mixed metagenomes containing both viral and host contigs is a critical first step in analyzing the viral component of samples. Current tools for distinguishing prokaryotic virus and host contigs primarily use gene-based similarity approaches. Such approaches can significantly limit results especially for short contigs that have few predicted proteins or lack proteins with similarity to previously known viruses. METHODS We have developed VirFinder, the first k-mer frequency based, machine learning method for virus contig identification that entirely avoids gene-based similarity searches. VirFinder instead identifies viral sequences based on our empirical observation that viruses and hosts have discernibly different k-mer signatures. VirFinder's performance in correctly identifying viral sequences was tested by training its machine learning model on sequences from host and viral genomes sequenced before 1 January 2014 and evaluating on sequences obtained after 1 January 2014. RESULTS VirFinder had significantly better rates of identifying true viral contigs (true positive rates (TPRs)) than VirSorter, the current state-of-the-art gene-based virus classification tool, when evaluated with either contigs subsampled from complete genomes or assembled from a simulated human gut metagenome. For example, for contigs subsampled from complete genomes, VirFinder had 78-, 2.4-, and 1.8-fold higher TPRs than VirSorter for 1, 3, and 5 kb contigs, respectively, at the same false positive rates as VirSorter (0, 0.003, and 0.006, respectively), thus VirFinder works considerably better for small contigs than VirSorter. VirFinder furthermore identified several recently sequenced virus genomes (after 1 January 2014) that VirSorter did not and that have no nucleotide similarity to previously sequenced viruses, demonstrating VirFinder's potential advantage in identifying novel viral sequences. Application of VirFinder to a set of human gut metagenomes from healthy and liver cirrhosis patients reveals higher viral diversity in healthy individuals than cirrhosis patients. We also identified contig bins containing crAssphage-like contigs with higher abundance in healthy patients and a putative Veillonella genus prophage associated with cirrhosis patients. CONCLUSIONS This innovative k-mer based tool complements gene-based approaches and will significantly improve prokaryotic viral sequence identification, especially for metagenomic-based studies of viral ecology.
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Affiliation(s)
- Jie Ren
- Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA, 90089, USA
| | - Nathan A Ahlgren
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Pkwy, Los Angeles, CA, 90089, USA.
- Present address: Biology Department, Clark University, 950 Main St, Worcester, MA, 01610, USA.
| | - Yang Young Lu
- Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA, 90089, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Pkwy, Los Angeles, CA, 90089, USA
| | - Fengzhu Sun
- Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA, 90089, USA.
- Center for Computational Systems Biology, Fudan University, 200433, Shanghai, China.
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Ahlgren NA, Chen Y, Needham DM, Parada AE, Sachdeva R, Trinh V, Chen T, Fuhrman JA. Genome and epigenome of a novel marine Thaumarchaeota strain suggest viral infection, phosphorothioation DNA modification and multiple restriction systems. Environ Microbiol 2017; 19:2434-2452. [PMID: 28418097 DOI: 10.1111/1462-2920.13768] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 04/08/2017] [Accepted: 04/11/2017] [Indexed: 11/29/2022]
Abstract
Marine Thaumarchaeota are abundant ammonia-oxidizers but have few representative laboratory-cultured strains. We report the cultivation of Candidatus Nitrosomarinus catalina SPOT01, a novel strain that is less warm-temperature tolerant than other cultivated Thaumarchaeota. Using metagenomic recruitment, strain SPOT01 comprises a major portion of Thaumarchaeota (4-54%) in temperate Pacific waters. Its complete 1.36 Mbp genome possesses several distinguishing features: putative phosphorothioation (PT) DNA modification genes; a region containing probable viral genes; and putative urea utilization genes. The PT modification genes and an adjacent putative restriction enzyme (RE) operon likely form a restriction modification (RM) system for defence from foreign DNA. PacBio sequencing showed >98% methylation at two motifs, and inferred PT guanine modification of 19% of possible TGCA sites. Metagenomic recruitment also reveals the putative virus region and PT modification and RE genes are present in 18-26%, 9-14% and <1.5% of natural populations at 150 m with ≥85% identity to strain SPOT01. The presence of multiple probable RM systems in a highly streamlined genome suggests a surprising importance for defence from foreign DNA for dilute populations that infrequently encounter viruses or other cells. This new strain provides new insights into the ecology, including viral interactions, of this important group of marine microbes.
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Affiliation(s)
- Nathan A Ahlgren
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Yangyang Chen
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, China.,Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao, China.,Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - David M Needham
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Alma E Parada
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Rohan Sachdeva
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Vickie Trinh
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Ting Chen
- Bioinformatics Division, TNLIST, Department of Computer Science and Technology, Tsinghua University, Beijing, China
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
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39
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Needham DM, Sachdeva R, Fuhrman JA. Ecological dynamics and co-occurrence among marine phytoplankton, bacteria and myoviruses shows microdiversity matters. ISME J 2017; 11:1614-1629. [PMID: 28398348 DOI: 10.1038/ismej.2017.29] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 01/13/2017] [Accepted: 02/02/2017] [Indexed: 12/21/2022]
Abstract
Numerous ecological processes, such as bacteriophage infection and phytoplankton-bacterial interactions, often occur via strain-specific mechanisms. Therefore, studying the causes of microbial dynamics should benefit from highly resolving taxonomic characterizations. We sampled daily to weekly over 5 months following a phytoplankton bloom off Southern California and examined the extent of microdiversity, that is, significant variation within 99% sequence similarity clusters, operational taxonomic units (OTUs), of bacteria, archaea, phytoplankton chloroplasts (all via 16S or intergenic spacer (ITS) sequences) and T4-like-myoviruses (via g23 major capsid protein gene sequence). The extent of microdiversity varied between genes (ITS most, g23 least) and only temporally common taxa were highly microdiverse. Overall, 60% of taxa exhibited microdiversity; 59% of these had subtypes that changed significantly as a proportion of the parent taxon, indicating ecologically distinct taxa. Pairwise correlations between prokaryotes and myoviruses or phytoplankton (for example, highly microdiverse Chrysochromulina sp.) improved when using single-base variants. Correlations between myoviruses and SAR11 increased in number (172 vs 9, Spearman>0.65) and became stronger (0.61 vs 0.58, t-test: P<0.001) when using SAR11 ITS single-base variants vs OTUs. Whole-community correlation between SAR11 and myoviruses was much improved when using ITS single-base variants vs OTUs, with Mantel rho=0.49 vs 0.27; these results are consistent with strain-specific interactions. Mantel correlations suggested >1 μm (attached/large) prokaryotes are a major myovirus source. Consideration of microdiversity improved observation of apparent host and virus networks, and provided insights into the ecological and evolutionary factors influencing the success of lineages, with important implications to ecosystem resilience and microbial function.
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Affiliation(s)
- David M Needham
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Rohan Sachdeva
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
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Abstract
Background The study of virus-host infectious association is important for understanding the functions and dynamics of microbial communities. Both cellular and fractionated viral metagenomic data generate a large number of viral contigs with missing host information. Although relative simple methods based on the similarity between the word frequency vectors of viruses and bacterial hosts have been developed to study virus-host associations, the problem is significantly understudied. We hypothesize that machine learning methods based on word frequencies can be efficiently used to study virus-host infectious associations. Methods We investigate four different representations of word frequencies of viral sequences including the relative word frequency and three normalized word frequencies by subtracting the number of expected from the observed word counts. We also study five machine learning methods including logistic regression, support vector machine, random forest, Gaussian naive Bayes and Bernoulli naive Bayes for separating infectious from non-infectious viruses for nine bacterial host genera with at least 45 infecting viruses. Area under the receiver operating characteristic curve (AUC) is used to compare the performance of different machine learning method and feature combinations. We then evaluate the performance of the best method for the identification of the hosts of contigs in metagenomic studies. We also develop a maximum likelihood method to estimate the fraction of true infectious viruses for a given host in viral tagging experiments. Results Based on nine bacterial host genera with at least 45 infectious viruses, we show that random forest together with the relative word frequency vector performs the best in identifying viruses infecting particular hosts. For all the nine host genera, the AUC is over 0.85 and for five of them, the AUC is higher than 0.98 when the word size is 6 indicating the high accuracy of using machine learning approaches for identifying viruses infecting particular hosts. We also show that our method can predict the hosts of viral contigs of length at least 1kbps in metagenomic studies with high accuracy. The random forest together with word frequency vector outperforms current available methods based on Manhattan and \documentclass[12pt]{minimal}
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\begin{document}$d_{2}^{*}$\end{document}d2∗ dissimilarity measures. Based on word frequencies, we estimate that about 95% of the identified T4-like viruses in viral tagging experiment infect Synechococcus, while only about 29% of the identified non-T4-like viruses and 30% of the contigs in the study potentially infect Synechococcus. Conclusions The random forest machine learning method together with the relative word frequencies as features of viruses can be used to predict viruses and viral contigs for specific bacterial hosts. The maximum likelihood approach can be used to estimate the fraction of true infectious associated viruses in viral tagging experiments. Electronic supplementary material The online version of this article (doi:10.1186/s12859-017-1473-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Mengge Zhang
- Molecular and Computational Biology Program, University of Southern California, Los Angeles, California, USA
| | - Lianping Yang
- College of Sciences, Northeastern University, Shenyang, China
| | - Jie Ren
- Molecular and Computational Biology Program, University of Southern California, Los Angeles, California, USA
| | - Nathan A Ahlgren
- Department of Biological Sciences and Wrigley Institute for Environmental Studies, University of Southern California, Los Angeles, California, USA.,Biology Department, Clark University, Worcester, Massachusetts, USA
| | - Jed A Fuhrman
- Department of Biological Sciences and Wrigley Institute for Environmental Studies, University of Southern California, Los Angeles, California, USA
| | - Fengzhu Sun
- Molecular and Computational Biology Program, University of Southern California, Los Angeles, California, USA. .,Centre for Computational Systems Biology, School of Mathematical Sciences, Fudan University, Shanhai, China.
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Ahlgren NA, Ren J, Lu YY, Fuhrman JA, Sun F. Alignment-free $d_2^*$ oligonucleotide frequency dissimilarity measure improves prediction of hosts from metagenomically-derived viral sequences. Nucleic Acids Res 2016; 45:39-53. [PMID: 27899557 PMCID: PMC5224470 DOI: 10.1093/nar/gkw1002] [Citation(s) in RCA: 161] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 10/31/2016] [Indexed: 01/17/2023] Open
Abstract
Viruses and their host genomes often share similar oligonucleotide frequency (ONF) patterns, which can be used to predict the host of a given virus by finding the host with the greatest ONF similarity. We comprehensively compared 11 ONF metrics using several k-mer lengths for predicting host taxonomy from among ∼32 000 prokaryotic genomes for 1427 virus isolate genomes whose true hosts are known. The background-subtracting measure [Formula: see text] at k = 6 gave the highest host prediction accuracy (33%, genus level) with reasonable computational times. Requiring a maximum dissimilarity score for making predictions (thresholding) and taking the consensus of the 30 most similar hosts further improved accuracy. Using a previous dataset of 820 bacteriophage and 2699 bacterial genomes, [Formula: see text] host prediction accuracies with thresholding and consensus methods (genus-level: 64%) exceeded previous Euclidian distance ONF (32%) or homology-based (22-62%) methods. When applied to metagenomically-assembled marine SUP05 viruses and the human gut virus crAssphage, [Formula: see text]-based predictions overlapped (i.e. some same, some different) with the previously inferred hosts of these viruses. The extent of overlap improved when only using host genomes or metagenomic contigs from the same habitat or samples as the query viruses. The [Formula: see text] ONF method will greatly improve the characterization of novel, metagenomic viruses.
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Affiliation(s)
- Nathan A Ahlgren
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Pkwy Los, Angeles, CA 90089, USA
| | - Jie Ren
- Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA 90089, USA
| | - Yang Young Lu
- Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA 90089, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Pkwy Los, Angeles, CA 90089, USA
| | - Fengzhu Sun
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Pkwy Los, Angeles, CA 90089, USA.,Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA 90089, USA.,Center for Computational Systems Biology, Fudan University, Shanghai 200433, China
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Weiss S, Van Treuren W, Lozupone C, Faust K, Friedman J, Deng Y, Xia LC, Xu ZZ, Ursell L, Alm EJ, Birmingham A, Cram JA, Fuhrman JA, Raes J, Sun F, Zhou J, Knight R. Correlation detection strategies in microbial data sets vary widely in sensitivity and precision. ISME J 2016; 10:1669-81. [PMID: 26905627 PMCID: PMC4918442 DOI: 10.1038/ismej.2015.235] [Citation(s) in RCA: 375] [Impact Index Per Article: 46.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 11/10/2015] [Accepted: 11/12/2015] [Indexed: 01/19/2023]
Abstract
Disruption of healthy microbial communities has been linked to numerous diseases, yet microbial interactions are little understood. This is due in part to the large number of bacteria, and the much larger number of interactions (easily in the millions), making experimental investigation very difficult at best and necessitating the nascent field of computational exploration through microbial correlation networks. We benchmark the performance of eight correlation techniques on simulated and real data in response to challenges specific to microbiome studies: fractional sampling of ribosomal RNA sequences, uneven sampling depths, rare microbes and a high proportion of zero counts. Also tested is the ability to distinguish signals from noise, and detect a range of ecological and time-series relationships. Finally, we provide specific recommendations for correlation technique usage. Although some methods perform better than others, there is still considerable need for improvement in current techniques.
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Affiliation(s)
- Sophie Weiss
- Department of Chemical and Biological
Engineering, University of Colorado at Boulder, Boulder,
CO, USA
| | - Will Van Treuren
- BioFrontiers Institute, University of
Colorado at Boulder, Boulder, CO,
USA
| | | | - Karoline Faust
- Department of Microbiology and
Immunology, Rega Institute KU Leuven, Leuven,
Belgium
- VIB Center for the Biology of Disease,
VIB, Leuven, Belgium
- Laboratory of Microbiology, Vrije
Universiteit Brussel, Brussels, Belgium
| | - Jonathan Friedman
- Department of Physics, Massachusetts
Institute of Technology, Cambridge, MA,
USA
| | - Ye Deng
- CAS Key Laboratory of Environmental
Biotechnology, Chinese Academy of Sciences, Beijing,
China
- Department of Microbiology and Plant
Biology, University of Oklahoma, Norman, OK, USA
| | - Li Charlie Xia
- Division of Oncology, Department of
Medicine, Stanford University School of Medicine, Stanford,
CA, USA
- Department of Statistics, The Wharton
School, University of Pennsylvania, Philadelphia,
PA, USA
| | - Zhenjiang Zech Xu
- Departments of Pediatrics, University
of California San Diego, La Jolla, CA,
USA
| | | | - Eric J Alm
- Center for Microbiome Informatics and
Therapeutics, Department of Biological Engineering, Massachusetts Institute of
Technology, Cambridge, MA, USA
| | - Amanda Birmingham
- Center for Computational Biology and
Bioinformatics, Department of Medicine, University of California San Diego,
La Jolla, CA, USA
| | - Jacob A Cram
- Department of Biological Sciences,
University of Southern California, Los Angeles,
CA, USA
| | - Jed A Fuhrman
- Department of Biological Sciences,
University of Southern California, Los Angeles,
CA, USA
| | - Jeroen Raes
- Department of Microbiology and
Immunology, Rega Institute KU Leuven, Leuven,
Belgium
- VIB Center for the Biology of Disease,
VIB, Leuven, Belgium
- Laboratory of Microbiology, Vrije
Universiteit Brussel, Brussels, Belgium
| | - Fengzhu Sun
- Molecular and Computational Biology
Program, University of Southern California, Los Angeles,
California, USA
| | - Jizhong Zhou
- Department of Microbiology and Plant
Biology, University of Oklahoma, Norman, OK, USA
- Earth Sciences Division, Lawrence
Berkeley National Laboratory, Berkeley,
California, USA
- State Key Joint Laboratory of
Environment Simulation and Pollution Control, School of Environment, Tsinghua
University, Beijing, China
| | - Rob Knight
- Departments of Pediatrics, University
of California San Diego, La Jolla, CA,
USA
- Department of Computer Science and
Engineering, University of California San Diego, La Jolla,
CA, USA
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43
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Bálint M, Bahram M, Eren AM, Faust K, Fuhrman JA, Lindahl B, O'Hara RB, Öpik M, Sogin ML, Unterseher M, Tedersoo L. Millions of reads, thousands of taxa: microbial community structure and associations analyzed via marker genes. FEMS Microbiol Rev 2016; 40:686-700. [DOI: 10.1093/femsre/fuw017] [Citation(s) in RCA: 136] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/23/2016] [Indexed: 11/13/2022] Open
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44
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Parada AE, Needham DM, Fuhrman JA. Every base matters: assessing small subunit rRNA primers for marine microbiomes with mock communities, time series and global field samples. Environ Microbiol 2015; 18:1403-14. [PMID: 26271760 DOI: 10.1111/1462-2920.13023] [Citation(s) in RCA: 1580] [Impact Index Per Article: 175.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 07/31/2015] [Accepted: 08/12/2015] [Indexed: 11/29/2022]
Abstract
Microbial community analysis via high-throughput sequencing of amplified 16S rRNA genes is an essential microbiology tool. We found the popular primer pair 515F (515F-C) and 806R greatly underestimated (e.g. SAR11) or overestimated (e.g. Gammaproteobacteria) common marine taxa. We evaluated marine samples and mock communities (containing 11 or 27 marine 16S clones), showing alternative primers 515F-Y (5'-GTGYCAGCMGCCGCGGTAA) and 926R (5'-CCGYCAATTYMTTTRAGTTT) yield more accurate estimates of mock community abundances, produce longer amplicons that can differentiate taxa unresolvable with 515F-C/806R, and amplify eukaryotic 18S rRNA. Mock communities amplified with 515F-Y/926R yielded closer observed community composition versus expected (r(2) = 0.95) compared with 515F-Y/806R (r(2) ∼ 0.5). Unexpectedly, biases with 515F-Y/806R against SAR11 in field samples (∼4-10-fold) were stronger than in mock communities (∼2-fold). Correcting a mismatch to Thaumarchaea in the 515F-C increased their apparent abundance in field samples, but not as much as using 926R rather than 806R. With plankton samples rich in eukaryotic DNA (> 1 μm size fraction), 18S sequences averaged ∼17% of all sequences. A single mismatch can strongly bias amplification, but even perfectly matched primers can exhibit preferential amplification. We show that beyond in silico predictions, testing with mock communities and field samples is important in primer selection.
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Affiliation(s)
- Alma E Parada
- University of Southern California, Los Angeles, CA, USA
| | | | - Jed A Fuhrman
- University of Southern California, Los Angeles, CA, USA
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45
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Xia LC, Ai D, Cram JA, Liang X, Fuhrman JA, Sun F. Statistical significance approximation in local trend analysis of high-throughput time-series data using the theory of Markov chains. BMC Bioinformatics 2015; 16:301. [PMID: 26390921 PMCID: PMC4578688 DOI: 10.1186/s12859-015-0732-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 09/05/2015] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Local trend (i.e. shape) analysis of time series data reveals co-changing patterns in dynamics of biological systems. However, slow permutation procedures to evaluate the statistical significance of local trend scores have limited its applications to high-throughput time series data analysis, e.g., data from the next generation sequencing technology based studies. RESULTS By extending the theories for the tail probability of the range of sum of Markovian random variables, we propose formulae for approximating the statistical significance of local trend scores. Using simulations and real data, we show that the approximate p-value is close to that obtained using a large number of permutations (starting at time points >20 with no delay and >30 with delay of at most three time steps) in that the non-zero decimals of the p-values obtained by the approximation and the permutations are mostly the same when the approximate p-value is less than 0.05. In addition, the approximate p-value is slightly larger than that based on permutations making hypothesis testing based on the approximate p-value conservative. The approximation enables efficient calculation of p-values for pairwise local trend analysis, making large scale all-versus-all comparisons possible. We also propose a hybrid approach by integrating the approximation and permutations to obtain accurate p-values for significantly associated pairs. We further demonstrate its use with the analysis of the Polymouth Marine Laboratory (PML) microbial community time series from high-throughput sequencing data and found interesting organism co-occurrence dynamic patterns. AVAILABILITY The software tool is integrated into the eLSA software package that now provides accelerated local trend and similarity analysis pipelines for time series data. The package is freely available from the eLSA website: http://bitbucket.org/charade/elsa.
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Affiliation(s)
- Li C Xia
- Department of Medicine, Division of Oncology, Stanford University School of Medicine, Stanford, 94305-5151, CA, USA.,Department of Statistics, The Wharton School, University of Pennsylvania, Philadelphia, 19104, PA, USA
| | - Dongmei Ai
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, China
| | - Jacob A Cram
- Marine and Environmental Biology, Department of Biological Sciences, University of Southern California, Los Angeles, 90089-0371, CA, USA
| | - Xiaoyi Liang
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, China
| | - Jed A Fuhrman
- Marine and Environmental Biology, Department of Biological Sciences, University of Southern California, Los Angeles, 90089-0371, CA, USA
| | - Fengzhu Sun
- Molecular and Computational Biology, Department of Biological Sciences, University of Southern California, Los Angeles, 90089-2910, CA, USA. .,Centre for Computational Systems Biology, Fudan University, Shanghai, 200433, China.
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46
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Kopf A, Bicak M, Kottmann R, Schnetzer J, Kostadinov I, Lehmann K, Fernandez-Guerra A, Jeanthon C, Rahav E, Ullrich M, Wichels A, Gerdts G, Polymenakou P, Kotoulas G, Siam R, Abdallah RZ, Sonnenschein EC, Cariou T, O'Gara F, Jackson S, Orlic S, Steinke M, Busch J, Duarte B, Caçador I, Canning-Clode J, Bobrova O, Marteinsson V, Reynisson E, Loureiro CM, Luna GM, Quero GM, Löscher CR, Kremp A, DeLorenzo ME, Øvreås L, Tolman J, LaRoche J, Penna A, Frischer M, Davis T, Katherine B, Meyer CP, Ramos S, Magalhães C, Jude-Lemeilleur F, Aguirre-Macedo ML, Wang S, Poulton N, Jones S, Collin R, Fuhrman JA, Conan P, Alonso C, Stambler N, Goodwin K, Yakimov MM, Baltar F, Bodrossy L, Van De Kamp J, Frampton DM, Ostrowski M, Van Ruth P, Malthouse P, Claus S, Deneudt K, Mortelmans J, Pitois S, Wallom D, Salter I, Costa R, Schroeder DC, Kandil MM, Amaral V, Biancalana F, Santana R, Pedrotti ML, Yoshida T, Ogata H, Ingleton T, Munnik K, Rodriguez-Ezpeleta N, Berteaux-Lecellier V, Wecker P, Cancio I, Vaulot D, Bienhold C, Ghazal H, Chaouni B, Essayeh S, Ettamimi S, Zaid EH, Boukhatem N, Bouali A, Chahboune R, Barrijal S, Timinouni M, El Otmani F, Bennani M, Mea M, Todorova N, Karamfilov V, Ten Hoopen P, Cochrane G, L'Haridon S, Bizsel KC, Vezzi A, Lauro FM, Martin P, Jensen RM, Hinks J, Gebbels S, Rosselli R, De Pascale F, Schiavon R, Dos Santos A, Villar E, Pesant S, Cataletto B, Malfatti F, Edirisinghe R, Silveira JAH, Barbier M, Turk V, Tinta T, Fuller WJ, Salihoglu I, Serakinci N, Ergoren MC, Bresnan E, Iriberri J, Nyhus PAF, Bente E, Karlsen HE, Golyshin PN, Gasol JM, Moncheva S, Dzhembekova N, Johnson Z, Sinigalliano CD, Gidley ML, Zingone A, Danovaro R, Tsiamis G, Clark MS, Costa AC, El Bour M, Martins AM, Collins RE, Ducluzeau AL, Martinez J, Costello MJ, Amaral-Zettler LA, Gilbert JA, Davies N, Field D, Glöckner FO. The ocean sampling day consortium. Gigascience 2015; 4:27. [PMID: 26097697 PMCID: PMC4473829 DOI: 10.1186/s13742-015-0066-5] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 05/06/2015] [Indexed: 11/26/2022] Open
Abstract
Ocean Sampling Day was initiated by the EU-funded Micro B3 (Marine Microbial Biodiversity, Bioinformatics, Biotechnology) project to obtain a snapshot of the marine microbial biodiversity and function of the world’s oceans. It is a simultaneous global mega-sequencing campaign aiming to generate the largest standardized microbial data set in a single day. This will be achievable only through the coordinated efforts of an Ocean Sampling Day Consortium, supportive partnerships and networks between sites. This commentary outlines the establishment, function and aims of the Consortium and describes our vision for a sustainable study of marine microbial communities and their embedded functional traits.
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Affiliation(s)
- Anna Kopf
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany ; Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
| | - Mesude Bicak
- University of Oxford, 7 Keble Road, OX1 3QG Oxford, Oxfordshire UK
| | - Renzo Kottmann
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany
| | - Julia Schnetzer
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany ; Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
| | - Ivaylo Kostadinov
- Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
| | - Katja Lehmann
- Centre for Ecology & Hydrology, MacLean Building, Benson Lane, Crowmarsh Gifford, OX10 8BB Wallingford, Oxfordshire UK
| | - Antonio Fernandez-Guerra
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany ; University of Oxford, 7 Keble Road, OX1 3QG Oxford, Oxfordshire UK
| | - Christian Jeanthon
- CNRS & Sorbonne Universités, UPMC Univ Paris 06, Station Biologique, Place Georges Teissier, F-29680 Roscoff, France
| | - Eyal Rahav
- Israel Oceanographic and Limnological Research, National Institute of Oceanography, Tel- Shikmona, POB 8030, 31080 Haifa, Israel
| | - Matthias Ullrich
- Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
| | - Antje Wichels
- Alfred Wegener Institute, Biologische Anstalt Helgoland, Kurpromenade 201, 27498 Helgoland, Germany
| | - Gunnar Gerdts
- Alfred Wegener Institute, Biologische Anstalt Helgoland, Kurpromenade 201, 27498 Helgoland, Germany
| | - Paraskevi Polymenakou
- Hellenic Centre for Marine Research, Institute of Marine Biology, Biotechnology and Aquaculture, Gournes Pediados, 71500 Heraklion, Crete Greece
| | - Giorgos Kotoulas
- Hellenic Centre for Marine Research, Institute of Marine Biology, Biotechnology and Aquaculture, Gournes Pediados, 71500 Heraklion, Crete Greece
| | - Rania Siam
- Biology Department and YJ-Science and Technology Research Center, American University in Cairo, New Cairo, 11835 Cairo Governorate Egypt
| | - Rehab Z Abdallah
- Biology Department and YJ-Science and Technology Research Center, American University in Cairo, New Cairo, 11835 Cairo Governorate Egypt
| | - Eva C Sonnenschein
- Department of Systems Biology, Technical University of Denmark, Matematiktorvet 301, 2800 Kgs., Lyngby, Denmark
| | - Thierry Cariou
- CNRS & Sorbonne Universités, UPMC Univ Paris 06, Station Biologique, Place Georges Teissier, F-29680 Roscoff, France
| | - Fergal O'Gara
- National University of Ireland-University College Cork, Cork, Ireland ; Curtin University, Biomedical Sciences, Perth, Western Australia Australia
| | - Stephen Jackson
- Department of Systems Biology, Technical University of Denmark, Matematiktorvet 301, 2800 Kgs., Lyngby, Denmark
| | - Sandi Orlic
- Ruđer Bošković Institute, Bijenička cesta 54, 10 000, Zagreb, Croatia
| | - Michael Steinke
- School of Biological Sciences, University of Essex, CO4 3SQ Colchester, Essex UK
| | - Julia Busch
- Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky University Oldenburg, Schleusenstrasse 1, 26383 Wilhemshaven, Germany
| | - Bernardo Duarte
- Marine and Environmental Sciences Centre, Faculty of Sciences of the University of Lisbon, Campo Grande 1749-016, Lisbon, Portugal
| | - Isabel Caçador
- Marine and Environmental Sciences Centre, Faculty of Sciences of the University of Lisbon, Campo Grande 1749-016, Lisbon, Portugal
| | - João Canning-Clode
- Marine and Environmental Sciences Centre, Faculty of Sciences of the University of Lisbon, Campo Grande 1749-016, Lisbon, Portugal ; Smithsonian Environmental Research Center, 21037 Edgewater, Maryland USA
| | - Oleksandra Bobrova
- Department of Microbiology, Virology and Biotechnology, Odessa National II Mechnikov University, Dvoryanskaya str.2, 65082 Odessa, Ukraine
| | | | | | - Clara Magalhães Loureiro
- InBio/CIBIO, Departamento de Biologia da Universidade dos Açores, 9501-801 Ponta Delgada, Portugal
| | - Gian Marco Luna
- National Research Council, Institute of Marine Sciences (CNR-ISMAR), Castello 2737/f, Arsenale Tesa 104, 30122 Venezia, Italy
| | - Grazia Marina Quero
- National Research Council, Institute of Marine Sciences (CNR-ISMAR), Castello 2737/f, Arsenale Tesa 104, 30122 Venezia, Italy
| | - Carolin R Löscher
- Institute of Microbiology/ GEOMAR, Am Botanischen Garten 1-9, 24118 Kiel, Germany
| | - Anke Kremp
- Marine Research Centre, Finnish Environment Institute, Erik Palmenin aukio 1, 00560 Helsinki, Finland
| | - Marie E DeLorenzo
- NOAA/National Ocean Service/NCCOS/Center for Coastal Environmental Health & Biomolecular Research Charleston, 29412 South Carolina, USA
| | - Lise Øvreås
- Department of Biology, University of Bergen, Thormøhlensgate 53B, 5020 Bergen, Norway
| | - Jennifer Tolman
- LaRoche Research Group, Department of Biology, Dalhousie University, B3H 4R2 Halifax, Nova Scotia Canada
| | - Julie LaRoche
- LaRoche Research Group, Department of Biology, Dalhousie University, B3H 4R2 Halifax, Nova Scotia Canada
| | - Antonella Penna
- Department of Biomolecular Sciences, University of Urbino, Viale Trieste 296, 61121 Pesaro, Italy
| | - Marc Frischer
- University of Georgia's Skidaway Institute of Oceanography, 10 Ocean Science Circle, 31411 Savannah, Georgia USA
| | - Timothy Davis
- NOAA-Great Lakes Environmental Research Laboratory, 4840 S State Road, 48108 Ann Arbor, Michigan USA
| | - Barker Katherine
- National Museum of Natural History, Smithsonian Institution, 10th and Constitution Avenue NW, 20013 Washington, DC USA
| | - Christopher P Meyer
- National Museum of Natural History, Smithsonian Institution, 10th and Constitution Avenue NW, 20013 Washington, DC USA
| | - Sandra Ramos
- CIIMAR, Interdisciplinary Center of Environmental and Marine Research, University of Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal
| | - Catarina Magalhães
- CIIMAR, Interdisciplinary Center of Environmental and Marine Research, University of Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal
| | - Florence Jude-Lemeilleur
- Station Marine d'Arcachon, CNRS & Univ Bordeaux, 2 rue Professeur Jolyet, F-33120 Arcachon, France
| | - Ma Leopoldina Aguirre-Macedo
- Centro de Investigación y de Estudios Avanzados (CINVESTAV), Unidad Mérida, Carretera Antigua a Progreso Km 6 Cordemex, C.P., 97310 Yucatan, Mexico
| | - Shiao Wang
- Department of Biological Sciences, University of Southern Mississippi, 39406 Hattiesburg, Mississippi USA
| | - Nicole Poulton
- Bigelow Laboratory for Ocean Sciences, 60 Bigelow Drive, 04544 East Boothbay, Maine USA
| | - Scott Jones
- Smithsonian Marine Station, 701 Seaway Drive, 34949 Fort Pierce, Florida USA
| | - Rachel Collin
- Smithsonian Tropical Research Institute, Apartado Postal 0843-03092, Balboa Ancon, Panama
| | - Jed A Fuhrman
- Wrigley Institute for Environmental Studies and Department of Biological Sciences, University of Southern California, 90089-0371 Los Angeles, California USA
| | - Pascal Conan
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR7621, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, F-66651 Banyuls sur Mer, France
| | - Cecilia Alonso
- Microbial Ecology of Aquatic Transitional Systems Research Group, Centro Universitario de la Región Este, Universidad de la República, Ruta 15, km 28.500, Rocha, Uruguay
| | - Noga Stambler
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, 5290002 Ramat-Gan, Israel ; Interuniversity Institute for Marine Sciences in Eilat, 88103 Eilat, Israel
| | - Kelly Goodwin
- NOAA Atlantic Oceanographic and Meteorological Laboratory, Ocean Chemistry and Ecosystems Division, 4301 Rickenbacker Causeway, 33149 Miami, Florida USA
| | - Michael M Yakimov
- Institute for Coastal Marine Environment, IAMC-CNR, Spianata S Raineri, 86 - 98122, Messina, Sicily Italy
| | - Federico Baltar
- Department of Marine Science, University of Otago, PO Box 56, 9054 Dunedin, New Zealand
| | - Levente Bodrossy
- CSIRO Oceans and Atmosphere Flagship, 7000 Hobart, Tasmania Australia
| | - Jodie Van De Kamp
- CSIRO Oceans and Atmosphere Flagship, 7000 Hobart, Tasmania Australia
| | - Dion Mf Frampton
- CSIRO Oceans and Atmosphere Flagship, 7000 Hobart, Tasmania Australia
| | - Martin Ostrowski
- Department of Chemistry and Biomolecular Science, Macquarie University, 2109 Sydney, Australia
| | - Paul Van Ruth
- South Australian Research and Development Institute (SARDI) - Aquatic Sciences, PO Box 120, 5022 Henley Beach, South Australia Australia
| | - Paul Malthouse
- South Australian Research and Development Institute (SARDI) - Aquatic Sciences, PO Box 120, 5022 Henley Beach, South Australia Australia
| | - Simon Claus
- Flanders Marine Institute, InnovOcean site, Wandelaarkaai 7, 8400 Oostende, Belgium
| | - Klaas Deneudt
- Flanders Marine Institute, InnovOcean site, Wandelaarkaai 7, 8400 Oostende, Belgium
| | - Jonas Mortelmans
- Flanders Marine Institute, InnovOcean site, Wandelaarkaai 7, 8400 Oostende, Belgium
| | - Sophie Pitois
- Centre for Environment, Fisheries and Aquaculture Science (CEFAS), Pakefield Road, NR33 0HT Lowestoft, Suffolk UK
| | - David Wallom
- University of Oxford, 7 Keble Road, OX1 3QG Oxford, Oxfordshire UK
| | - Ian Salter
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR7621, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, F-66651 Banyuls sur Mer, France ; Alfred-Wegener-Institut-Helmholtz-Zentrum für Polar-und Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Rodrigo Costa
- Microbial Ecology and Evolution Research Group, Centre of Marine Sciences, Algarve University, Gambelas Campus, Building 7, Room 2.77, 8005-139 Faro, Portugal
| | - Declan C Schroeder
- Marine Biological Association of the UK, Citadel Hill, PL1 2PB Plymouth, Devon UK
| | - Mahrous M Kandil
- Soil and Water Science Department, Faculty of Agriculture, Alexandria University, El-Shatbi, 21545 Alexandria, Egypt
| | - Valentina Amaral
- Microbial Ecology of Aquatic Transitional Systems Research Group, Centro Universitario de la Región Este, Universidad de la República, Ruta 15, km 28.500, Rocha, Uruguay
| | - Florencia Biancalana
- Marine Biogeochemistry - Argentine Institute of Oceanography, Camino La Carrindanga Km 7,5, 8000 Florida, Bahia Blanca Argentina
| | - Rafael Santana
- Microbial Ecology of Aquatic Transitional Systems Research Group, Centro Universitario de la Región Este, Universidad de la República, Ruta 15, km 28.500, Rocha, Uruguay
| | - Maria Luiza Pedrotti
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7093, LOV, Observatoire océanologique, F-Villefranche-sur-Mer, Paris, France
| | - Takashi Yoshida
- Graduate School of Agriculture, Kyoto University, 606-8502 Sakyo-ku, Kyoto Japan
| | - Hiroyuki Ogata
- Graduate School of Agriculture, Kyoto University, 606-8502 Sakyo-ku, Kyoto Japan
| | - Tim Ingleton
- Waters, Wetlands and Coasts, New South Wales Office of Environment and Heritage, Sydney South 1232, 59-61 Goulburn Street, 2001 PO Box A290, Sydney, New South Wales Australia ; Antarctic and Southern Ocean Studies, University of Tasmania, 7004 Hobart, Tasmania Australia
| | - Kate Munnik
- Lwandle Technologies, Black River Park, Fir Road, 7925 Observatory, Cape Town South Africa
| | | | | | - Patricia Wecker
- CRIOBE, USR3278 CNRS-EPHE-UPVD, LabEx Corail, BP 1013-98729 Papetoai Moorea, French Polynesia
| | - Ibon Cancio
- University of the Basque Country, PO Box 644, E-48080 Bilbao, Basque Country Spain
| | - Daniel Vaulot
- CNRS & Sorbonne Universités, UPMC Univ Paris 06, Station Biologique, Place Georges Teissier, F-29680 Roscoff, France
| | - Christina Bienhold
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany ; Alfred-Wegener-Institut-Helmholtz-Zentrum für Polar-und Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Hassan Ghazal
- Polydisciplinary Faculty of Nador, University Mohammed Premier, Selouane, Nador Morocco ; Laboratory of Genetics and Biotechnology, University Mohammed Premier, Oujda, Morocco
| | - Bouchra Chaouni
- Laboratory of Genetics and Biotechnology, University Mohammed Premier, Oujda, Morocco ; Faculty of Sciences of Rabat, University Mohammed Fifth Rabat, Rabat, Morocco
| | - Soumya Essayeh
- Polydisciplinary Faculty of Nador, University Mohammed Premier, Selouane, Nador Morocco
| | - Sara Ettamimi
- Laboratory of Genetics and Biotechnology, University Mohammed Premier, Oujda, Morocco ; Polydisciplinary Faculty of Taza, University Sidi Mohammed Ben Abdallah, Fes, Morocco
| | - El Houcine Zaid
- Faculty of Sciences of Rabat, University Mohammed Fifth Rabat, Rabat, Morocco
| | - Noureddine Boukhatem
- Laboratory of Genetics and Biotechnology, University Mohammed Premier, Oujda, Morocco
| | - Abderrahim Bouali
- Laboratory of Genetics and Biotechnology, University Mohammed Premier, Oujda, Morocco
| | - Rajaa Chahboune
- Polydisciplinary Faculty of Nador, University Mohammed Premier, Selouane, Nador Morocco ; Faculté des Sciences et Techniques de Tanger, Université Abdelmalek Essaâdi, Tanger, Morocco
| | - Said Barrijal
- Faculté des Sciences et Techniques de Tanger, Université Abdelmalek Essaâdi, Tanger, Morocco
| | - Mohammed Timinouni
- Pasteur Institute of Morocco, 1 Place Louis Pasteur, 20100 Casablanca, Morocco
| | - Fatima El Otmani
- Microbiology, Health and Environment Team, Department of Biology, Faculty of Sciences, Chouaib Doukkali University, Rte Ben Maachou, BP 20 Avenue des Facultés, El Jadida, Morocco
| | - Mohamed Bennani
- Pasteur Institute of Morocco, 1 Place Louis Pasteur, 20100 Casablanca, Morocco
| | - Marianna Mea
- Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
| | - Nadezhda Todorova
- Institute of Biodiversity and Ecosystem Research (IBER), Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia, Bulgaria
| | - Ventzislav Karamfilov
- Institute of Biodiversity and Ecosystem Research (IBER), Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia, Bulgaria
| | - Petra Ten Hoopen
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, CB10 1SD Cambridge, Cambridgeshire UK
| | - Guy Cochrane
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, CB10 1SD Cambridge, Cambridgeshire UK
| | - Stephane L'Haridon
- Université de Bretagne Occidentale (UBO, UEB), Institut Universitaire Européen de la Mer (IUEM), Place Nicolas Copernic, F-29280 Plouzané, France
| | - Kemal Can Bizsel
- Dokuz Eylul University (DEU), Institute of Marine Sciences and Technology (IMST), Baku Bulvard, No: 100, Inciralti, 35340 Izmir, Balcova Turkey
| | - Alessandro Vezzi
- Department of Biology, University of Padova, Via Ugo Bassi 58/B, 35121 Padova, Italy
| | - Federico M Lauro
- Singapore Centre for Environmental Life Sciences Engineering, 60 Nanyang Drive, SBS 01N-27, 637551 Singapore, Singapore
| | - Patrick Martin
- Earth Observatory of Singapore, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore
| | - Rachelle M Jensen
- Indigo V Expeditions, ONE°15 Marina, #01-01, 11 Cove Drive, Sentosa Cove, 098497 Singapore, Singapore
| | - Jamie Hinks
- Singapore Centre for Environmental Life Sciences Engineering, 60 Nanyang Drive, SBS 01N-27, 637551 Singapore, Singapore
| | - Susan Gebbels
- School of Marine Science and Technology, Newcastle University, Dove Marine Laboratory, Cullercoats, NE30 4PZ Tyne and Wear UK
| | - Riccardo Rosselli
- Department of Biology, University of Padova, Via Ugo Bassi 58/B, 35121 Padova, Italy
| | - Fabio De Pascale
- Department of Biology, University of Padova, Via Ugo Bassi 58/B, 35121 Padova, Italy
| | - Riccardo Schiavon
- Department of Biology, University of Padova, Via Ugo Bassi 58/B, 35121 Padova, Italy
| | - Antonina Dos Santos
- IPMA, Department of Sea and Marine Resources, Avenida de Brasília, s/n, 1449-006 Lisboa, Portugal
| | - Emilie Villar
- Aix Marseille Université, CNRS, IGS UMR 7256, 163 Avenue de Luminy, 13288 Marseille, France
| | - Stéphane Pesant
- PANGAEA - Data Publisher for Earth & Environmental Science, MARUM Center for Marine Environmental Sciences, University Bremen, Hochschulring 18, 28359 Bremen, Germany
| | - Bruno Cataletto
- OGS, National Institute of Oceanography and Experimental Geophysics, Via Auguste Piccard, 54, 34151, Santa Croce, Trieste, Italy
| | - Francesca Malfatti
- OGS, National Institute of Oceanography and Experimental Geophysics, Via Auguste Piccard, 54, 34151, Santa Croce, Trieste, Italy
| | - Ranjith Edirisinghe
- Department of Physical Sciences, Faculty of Applied Sciences, Rajarata University of Sri Lanka, Mihintale, Sri Lanka
| | - Jorge A Herrera Silveira
- Department of Biological Sciences, University of Southern Mississippi, 39406 Hattiesburg, Mississippi USA
| | - Michele Barbier
- Mediterranean Science Commission, 16 Bd de Suisse, 98 000 Monaco, Monaco
| | - Valentina Turk
- Marine Biology Station, National Institute of Biology, Fornače 41, 6330 Piran, Slovenia
| | - Tinkara Tinta
- Marine Biology Station, National Institute of Biology, Fornače 41, 6330 Piran, Slovenia
| | - Wayne J Fuller
- Near East University, TRNC Mersin 10, 99138 Nicosia, Northern Cyprus
| | - Ilkay Salihoglu
- Near East University, TRNC Mersin 10, 99138 Nicosia, Northern Cyprus
| | - Nedime Serakinci
- Near East University, TRNC Mersin 10, 99138 Nicosia, Northern Cyprus
| | | | - Eileen Bresnan
- Phytoplankton Ecology, Marine Scotland Marine Laboratory, 375 Victoria Road, AB11 9DB Aberdeen, Aberdeenshire UK
| | - Juan Iriberri
- University of the Basque Country, PO Box 644, E-48080 Bilbao, Basque Country Spain
| | | | - Edvardsen Bente
- Section for Aquatic Biology and Toxicology, Department of Biosciences, University of Oslo, PO Box 1066, 0316 Blindern, Oslo Norway
| | - Hans Erik Karlsen
- Drøbak Field Station, Marine Biology Research station, Biologiveien 2, 1440 Drøbak, Norway
| | - Peter N Golyshin
- School of Biological Sciences, College of Natural Sciences, Bangor University, LL57 2UW Gwynedd, Bangor UK
| | - Josep M Gasol
- Departament de Biologia Marina i Oceanografia, Institut de Ciències del Mar-CSIC, Pg Marítim de la Barceloneta 37-49, E08003 Barcelona, Catalunya Spain
| | - Snejana Moncheva
- Fridtjof Nansen Institute of Oceanology, First May Street 40, 9000 Varna, Bulgaria
| | - Nina Dzhembekova
- Fridtjof Nansen Institute of Oceanology, First May Street 40, 9000 Varna, Bulgaria
| | - Zackary Johnson
- Nicholas School of the Environment and Biology Department, Duke University, 135 Marine Lab Road, 28516 Beaufort, North Carolina USA
| | - Christopher David Sinigalliano
- NOAA Atlantic Oceanographic and Meteorological Laboratory, Ocean Chemistry and Ecosystems Division, 4301 Rickenbacker Causeway, 33149 Miami, Florida USA
| | - Maribeth Louise Gidley
- NOAA Atlantic Oceanographic and Meteorological Laboratory, Ocean Chemistry and Ecosystems Division, 4301 Rickenbacker Causeway, 33149 Miami, Florida USA ; Cooperative Institute of Marine and Atmospheric Sciences, Rosenstiel School of Marine & Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, 33149 Miami, Florida USA
| | - Adriana Zingone
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
| | - Roberto Danovaro
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy ; Department of Life and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - George Tsiamis
- Department of Environmental and Natural Resources Management, University of Patras, 2 Seferi Street, 301 00 Agrinio, Greece
| | - Melody S Clark
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, CB3 0ET Cambridge, Cambridgeshire UK
| | - Ana Cristina Costa
- InBio/CIBIO, Departamento de Biologia da Universidade dos Açores, 9501-801 Ponta Delgada, Portugal
| | - Monia El Bour
- Institut National des Sciences et Technologies de la Mer (INSTM), 28 rue du 2 mars 1934, 2025 Salammbô, Tunisia
| | - Ana M Martins
- InBio/CIBIO, Departamento de Biologia da Universidade dos Açores, 9501-801 Ponta Delgada, Portugal ; Department of Oceanography and Fisheries, University of the Azores, PT-9901-862 Horta, Portugal
| | - R Eric Collins
- University of Alaska Fairbanks, Box 757220, 99775 Fairbanks, Alaska USA
| | | | - Jonathan Martinez
- University of Hawaii at Manoa, Kewalo Marine Laboratory, 41 Ahui St., Honolulu, 96813 Hawaii, USA
| | - Mark J Costello
- Institute of Marine Science, University of Auckland, Private Bag 92019, Auckland, 1142 New Zealand
| | - Linda A Amaral-Zettler
- Marine Biological Laboratory, 7 MBL Street, Woods Hole, 02543 Massachusetts, USA ; Department of Earth, Environmental, and Planetary Sciences, Brown University, 02912 Providence, Rhode Island USA
| | - Jack A Gilbert
- College of Environmental and Resource Sciences, Zhejiang University, 310058 Hangzhou, China ; Institute for Genomic and Systems Biology, Bioscience Division, Argonne National Laboratory, 9700 South Cass Avenue, 60439 Argonne, Illinois USA ; University of Chicago, 1101 E 57th Street, 60637 Chicago, Illinois USA ; Marine Biological Laboratory, 7 MBL Street, Woods Hole, 02543 Massachusetts, USA
| | - Neil Davies
- Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany ; Gump South Pacific Research Station, University of California Berkeley, BP 244 98728 Moorea, French Polynesia
| | - Dawn Field
- Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany ; University of Oxford, 7 Keble Road, OX1 3QG Oxford, Oxfordshire UK
| | - Frank Oliver Glöckner
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany ; Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
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47
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Weitz JS, Stock CA, Wilhelm SW, Bourouiba L, Coleman ML, Buchan A, Follows MJ, Fuhrman JA, Jover LF, Lennon JT, Middelboe M, Sonderegger DL, Suttle CA, Taylor BP, Frede Thingstad T, Wilson WH, Eric Wommack K. A multitrophic model to quantify the effects of marine viruses on microbial food webs and ecosystem processes. ISME J 2015; 9:1352-64. [PMID: 25635642 PMCID: PMC4438322 DOI: 10.1038/ismej.2014.220] [Citation(s) in RCA: 131] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2014] [Revised: 10/15/2014] [Accepted: 10/17/2014] [Indexed: 11/08/2022]
Abstract
Viral lysis of microbial hosts releases organic matter that can then be assimilated by nontargeted microorganisms. Quantitative estimates of virus-mediated recycling of carbon in marine waters, first established in the late 1990s, were originally extrapolated from marine host and virus densities, host carbon content and inferred viral lysis rates. Yet, these estimates did not explicitly incorporate the cascade of complex feedbacks associated with virus-mediated lysis. To evaluate the role of viruses in shaping community structure and ecosystem functioning, we extend dynamic multitrophic ecosystem models to include a virus component, specifically parameterized for processes taking place in the ocean euphotic zone. Crucially, we are able to solve this model analytically, facilitating evaluation of model behavior under many alternative parameterizations. Analyses reveal that the addition of a virus component promotes the emergence of complex communities. In addition, biomass partitioning of the emergent multitrophic community is consistent with well-established empirical norms in the surface oceans. At steady state, ecosystem fluxes can be probed to characterize the effects that viruses have when compared with putative marine surface ecosystems without viruses. The model suggests that ecosystems with viruses will have (1) increased organic matter recycling, (2) reduced transfer to higher trophic levels and (3) increased net primary productivity. These model findings support hypotheses that viruses can have significant stimulatory effects across whole-ecosystem scales. We suggest that existing efforts to predict carbon and nutrient cycling without considering virus effects are likely to miss essential features of marine food webs that regulate global biogeochemical cycles.
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Affiliation(s)
- Joshua S Weitz
- School of Biology, Georgia Institute of Technology, Atlanta, GA, USA
- School of Physics, Georgia Institute of Technology, Atlanta, GA, USA
| | - Charles A Stock
- Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, NJ, USA
| | - Steven W Wilhelm
- Department of Microbiology, University of Tennessee, Knoxville, TN, USA
| | - Lydia Bourouiba
- Department of Applied Mathematics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | - Alison Buchan
- Department of Microbiology, University of Tennessee, Knoxville, TN, USA
| | - Michael J Follows
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Luis F Jover
- School of Physics, Georgia Institute of Technology, Atlanta, GA, USA
| | - Jay T Lennon
- Department of Biology, Indiana University, Bloomington, IN, USA
| | - Mathias Middelboe
- Marine Biological Section, University of Copenhagen, Copenhagen, Denmark
| | | | - Curtis A Suttle
- Department of Earth and Ocean Sciences, Department of Botany, and Department of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Bradford P Taylor
- School of Physics, Georgia Institute of Technology, Atlanta, GA, USA
| | | | | | - K Eric Wommack
- Delaware Biotechnology Institute, University of Delaware, Newark, DE, USA
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48
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Abstract
Factors controlling the spatial distribution of bacterial diversity have been intensely studied, whereas less is known about temporal changes. To address this, we tested whether the mechanisms that underlie bacterial temporal beta-diversity vary across different scales in three marine microbial communities. While seasonal turnover was detected, at least 73% of the community variation occurred at intra-seasonal temporal scales, suggesting that episodic events are important in structuring marine microbial communities. In addition, turnover at different temporal scales appeared to be driven by different factors. Intra-seasonal turnover was significantly correlated to environmental variables such as phosphate and silicate concentrations, while seasonal and interannual turnover were related to nitrate concentration and temporal distance. We observed a strong link between the magnitude of environmental variation and bacterial beta-diversity in different communities. Analogous to spatial biogeography, we found different rates of community changes across temporal scales.
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Affiliation(s)
- Stephen M Hatosy
- Department of Ecology and Evolutionary Biology, University of California, Irvine, California 92697, USA
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49
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Harwood VJ, Boehm AB, Sassoubre LM, Vijayavel K, Stewart JR, Fong TT, Caprais MP, Converse RR, Diston D, Ebdon J, Fuhrman JA, Gourmelon M, Gentry-Shields J, Griffith JF, Kashian DR, Noble RT, Taylor H, Wicki M. Performance of viruses and bacteriophages for fecal source determination in a multi-laboratory, comparative study. Water Res 2013; 47:6929-43. [PMID: 23886543 DOI: 10.1016/j.watres.2013.04.064] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Revised: 03/04/2013] [Accepted: 04/03/2013] [Indexed: 05/26/2023]
Abstract
An inter-laboratory study of the accuracy of microbial source tracking (MST) methods was conducted using challenge fecal and sewage samples that were spiked into artificial freshwater and provided as unknowns (blind test samples) to the laboratories. The results of the Source Identification Protocol Project (SIPP) are presented in a series of papers that cover 41 MST methods. This contribution details the results of the virus and bacteriophage methods targeting human fecal or sewage contamination. Human viruses used as source identifiers included adenoviruses (HAdV), enteroviruses (EV), norovirus Groups I and II (NoVI and NoVII), and polyomaviruses (HPyVs). Bacteriophages were also employed, including somatic coliphages and F-specific RNA bacteriophages (FRNAPH) as general indicators of fecal contamination. Bacteriophage methods targeting human fecal sources included genotyping of FRNAPH isolates and plaque formation on bacterial hosts Enterococcus faecium MB-55, Bacteroides HB-73 and Bacteroides GB-124. The use of small sample volumes (≤50 ml) resulted in relatively insensitive theoretical limits of detection (10-50 gene copies or plaques × 50 ml(-1)) which, coupled with low virus concentrations in samples, resulted in high false-negative rates, low sensitivity, and low negative predictive values. On the other hand, the specificity of the human virus methods was generally close to 100% and positive predictive values were ∼40-70% with the exception of NoVs, which were not detected. The bacteriophage methods were generally much less specific toward human sewage than virus methods, although FRNAPH II genotyping was relatively successful, with 18% sensitivity and 85% specificity. While the specificity of the human virus methods engenders great confidence in a positive result, better concentration methods and larger sample volumes must be utilized for greater accuracy of negative results, i.e. the prediction that a human contamination source is absent.
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Affiliation(s)
- Valerie J Harwood
- Department of Integrative Biology, University of South Florida, Tampa, FL 33620, USA.
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50
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Chow CET, Kim DY, Sachdeva R, Caron DA, Fuhrman JA. Top-down controls on bacterial community structure: microbial network analysis of bacteria, T4-like viruses and protists. ISME J 2013; 8:816-29. [PMID: 24196323 DOI: 10.1038/ismej.2013.199] [Citation(s) in RCA: 169] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 09/10/2013] [Accepted: 09/26/2013] [Indexed: 01/25/2023]
Abstract
Characterizing ecological relationships between viruses, bacteria and protists in the ocean are critical to understanding ecosystem function, yet these relationships are infrequently investigated together. We evaluated these relationships through microbial association network analysis of samples collected approximately monthly from March 2008 to January 2011 in the surface ocean (0-5 m) at the San Pedro Ocean Time series station. Bacterial, T4-like myoviral and protistan communities were described by Automated Ribosomal Intergenic Spacer Analysis and terminal restriction fragment length polymorphism of the gene encoding the major capsid protein (g23) and 18S ribosomal DNA, respectively. Concurrent shifts in community structure suggested similar timing of responses to environmental and biological parameters. We linked T4-like myoviral, bacterial and protistan operational taxonomic units by local similarity correlations, which were then visualized as association networks. Network links (correlations) potentially represent synergistic and antagonistic relationships such as viral lysis, grazing, competition or other interactions. We found that virus-bacteria relationships were more cross-linked than protist-bacteria relationships, suggestive of increased taxonomic specificity in virus-bacteria relationships. We also found that 80% of bacterial-protist and 74% of bacterial-viral correlations were positive, with the latter suggesting that at monthly and seasonal timescales, viruses may be following their hosts more often than controlling host abundance.
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Affiliation(s)
- Cheryl-Emiliane T Chow
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Diane Y Kim
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Rohan Sachdeva
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - David A Caron
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Jed A Fuhrman
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
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