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Targeted metagenomics and ecology of globally important uncultured eukaryotic phytoplankton

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
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  1. Monterey Bay Aquarium Research Institute, Moss Landing, CA 95039; Rosenstiel School of Marine and Atmospheric Science, Miami, FL 33149
  2. J. Craig Venter Institute, San Diego, CA 92121
  3. Monterey Bay Aquarium Research Institute, Moss Landing, CA 95039
  4. US Department of Energy Joint Genome Institute, Walnut Creek, CA 94598
  5. Department of Biology, Washington University, St. Louis, MO 63130
  6. Department of Marine Sciences, University of Georgia, Athens, GA 36072
  7. Institut de Ciències del Mar (CSIC), E-08003 Barcelona, Spain; and
  8. Rosenstiel School of Marine and Atmospheric Science, Miami, FL 33149
  9. Department of Biological Sciences, California State University, San Marcos, CA 92096
Among eukaryotes, four major phytoplankton lineages are responsible for marine photosynthesis; prymnesiophytes, alveolates, stramenopiles, and prasinophytes. Contributions by individual taxa, however, are not well known, and genomes have been analyzed from only the latter two lineages. Tiny “picoplanktonic” members of the prymnesiophyte lineage have long been inferred to be ecologically important but remain poorly characterized. Here, we examine pico-prymnesiophyte evolutionary history and ecology using cultivation-independent methods. 18S rRNA gene analysis showed pico-prymnesiophytes belonged to broadly distributed uncultivated taxa. Therefore, we used targeted metagenomics to analyze uncultured pico-prymnesiophytes sorted by flow cytometry from subtropical North Atlantic waters. The data reveal a composite nuclear-encoded gene repertoire with strong green-lineage affiliations, which contrasts with the evolutionary history indicated by the plastid genome. Measured pico-prymnesiophyte growth rates were rapid in this region, resulting in primary production contributions similar to the cyanobacterium Prochlorococcus . On average, pico-prymnesiophytes formed 25% of global picophytoplankton biomass, with differing contributions in five biogeographical provinces spanning tropical to subpolar systems. Elements likely contributing to success include high gene density and genes potentially involved in defense and nutrient uptake. Our findings have implications reaching beyond pico-prymnesiophytes, to the prasinophytes and stramenopiles. For example, prevalence of putative Ni-containing superoxide dismutases (SODs), instead of Fe-containing SODs, seems to be a common adaptation among eukaryotic phytoplankton for reducing Fe quotas in low-Fe modern oceans. Moreover, highly mosaic gene repertoires, although compositionally distinct for each major eukaryotic lineage, now seem to be an underlying facet of successful marine phytoplankton.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1051835
Alternate ID(s):
OSTI ID: 1153668
Report Number(s):
LBNL-5175E
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 33 Vol. 107; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (26)

Diversity of transcripts and transcript processing forms in plastids of the dinoflagellate alga Karenia mikimotoi journal January 2016
Global distribution of a wild alga revealed by targeted metagenomics journal September 2012
Influence of nutrients and currents on the genomic composition of microbes across an upwelling mosaic journal January 2012
Global biogeography of highly diverse protistan communities in soil journal December 2012
Gene invasion in distant eukaryotic lineages: discovery of mutually exclusive genetic elements reveals marine biodiversity journal May 2013
Spatial Variability of Picoeukaryotic Communities in the Mariana Trench journal October 2018
Single cell genome analysis of an uncultured heterotrophic stramenopile journal April 2014
Accessing the genomic information of unculturable oceanic picoeukaryotes by combining multiple single cells journal January 2017
Measuring the microbiome: perspectives on advances in DNA-based techniques for exploring microbial life journal February 2012
Deep-branching Novel Lineages and High Diversity of Haptophytes in the Skagerrak (Norway) Uncovered by 454 Pyrosequencing journal September 2014
Contrasting Mixotrophic Lifestyles Reveal Different Ecological Niches in Two Closely Related Marine Protists journal November 2019
The mitochondrial and chloroplast genomes of the haptophyte Chrysochromulina tobin contain unique repeat structures and gene profiles journal January 2014
Short-term responses of unicellular planktonic eukaryotes to increases in temperature and UVB radiation journal January 2012
A novel cost effective and high-throughput isolation and identification method for marine microalgae journal August 2014
Genomes of uncultured eukaryotes: sorting FACS from fiction journal January 2011
Extensive horizontal gene transfer, duplication, and loss of chlorophyll synthesis genes in the algae journal January 2015
The Marine Microbial Eukaryote Transcriptome Sequencing Project (MMETSP): Illuminating the Functional Diversity of Eukaryotic Life in the Oceans through Transcriptome Sequencing journal June 2014
How and Why DNA Barcodes Underestimate the Diversity of Microbial Eukaryotes journal February 2011
Plastid 16S rRNA Gene Diversity among Eukaryotic Picophytoplankton Sorted by Flow Cytometry from the South Pacific Ocean journal April 2011
Metagenomes of the Picoalga Bathycoccus from the Chile Coastal Upwelling journal June 2012
Exploration of Noncoding Sequences in Metagenomes journal March 2013
Picomonas judraskeda Gen. Et Sp. Nov.: The First Identified Member of the Picozoa Phylum Nov., a Widespread Group of Picoeukaryotes, Formerly Known as ‘Picobiliphytes’ journal March 2013
Diversity and Evolutionary History of Iron Metabolism Genes in Diatoms journal June 2015
ProDeGe: a computational protocol for fully automated decontamination of genomes text January 2016
Fungi Contribute Critical but Spatially Varying Roles in Nitrogen and Carbon Cycling in Acid Mine Drainage journal March 2016
A Sample-to-Sequence Protocol for Genus Targeted Transcriptomic Profiling: Application to Marine Synechococcus journal October 2016

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