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Title: Genome Sequence and Transcriptome Analyses of Chrysochromulina tobin: Metabolic Tools for Enhanced Algal Fitness in the Prominent Order Prymnesiales (Haptophyceae)

Abstract

Haptophytes are recognized as seminal players in aquatic ecosystem function. These algae are important in global carbon sequestration, form destructive harmful blooms, and given their rich fatty acid content, serve as a highly nutritive food source to a broad range of eco-cohorts. Haptophyte dominance in both fresh and marine waters is supported by the mixotrophic nature of many taxa. Despite their importance the nuclear genome sequence of only one haptophyte, Emiliania huxleyi (Isochrysidales), is available. Here we report the draft genome sequence of Chrysochromulina tobin (Prymnesiales), and transcriptome data collected at seven time points over a 24-hour light/dark cycle. The nuclear genome of C. tobin is small (59 Mb), compact (~40% of the genome is protein coding) and encodes approximately 16,777 genes. Genes important to fatty acid synthesis, modification, and catabolism show distinct patterns of expression when monitored over the circadian photoperiod. The C. tobin genome harbors the first hybrid polyketide synthase/non-ribosomal peptide synthase gene complex reported for an algal species, and encodes potential anti-microbial peptides and proteins involved in multidrug and toxic compound extrusion. A new haptophyte xanthorhodopsin was also identified, together with two “red” RuBisCO activases that are shared across many algal lineages. In conclusion, the Chrysochromulina tobinmore » genome sequence provides new information on the evolutionary history, ecology and economic importance of haptophytes.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [3];  [2];  [1];  [4]
  1. Univ. of Washington, Seattle, WA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. San Diego State Univ., CA (United States)
  4. Micro Trek Inc., Davis, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1259483
Grant/Contract Number:  
EE0003046; WSYN_BIO; DGE-0718124; DGE-1256082; 1RL1CA133831; NA07OAR-4170007
Resource Type:
Accepted Manuscript
Journal Name:
PLoS Genetics
Additional Journal Information:
Journal Volume: 11; Journal Issue: 9; Journal ID: ISSN 1553-7404
Publisher:
Public Library of Science
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Hovde, Blake T., Deodato, Chloe R., Hunsperger, Heather M., Ryken, Scott A., Yost, Will, Jha, Ramesh K., Patterson, Johnathan, Monnat, Raymond J., Barlow, Steven B., Starkenburg, Shawn R., Cattolico, Rose Ann, and Richardson, Paul M. Genome Sequence and Transcriptome Analyses of Chrysochromulina tobin: Metabolic Tools for Enhanced Algal Fitness in the Prominent Order Prymnesiales (Haptophyceae). United States: N. p., 2015. Web. doi:10.1371/journal.pgen.1005469.
Hovde, Blake T., Deodato, Chloe R., Hunsperger, Heather M., Ryken, Scott A., Yost, Will, Jha, Ramesh K., Patterson, Johnathan, Monnat, Raymond J., Barlow, Steven B., Starkenburg, Shawn R., Cattolico, Rose Ann, & Richardson, Paul M. Genome Sequence and Transcriptome Analyses of Chrysochromulina tobin: Metabolic Tools for Enhanced Algal Fitness in the Prominent Order Prymnesiales (Haptophyceae). United States. https://doi.org/10.1371/journal.pgen.1005469
Hovde, Blake T., Deodato, Chloe R., Hunsperger, Heather M., Ryken, Scott A., Yost, Will, Jha, Ramesh K., Patterson, Johnathan, Monnat, Raymond J., Barlow, Steven B., Starkenburg, Shawn R., Cattolico, Rose Ann, and Richardson, Paul M. Wed . "Genome Sequence and Transcriptome Analyses of Chrysochromulina tobin: Metabolic Tools for Enhanced Algal Fitness in the Prominent Order Prymnesiales (Haptophyceae)". United States. https://doi.org/10.1371/journal.pgen.1005469. https://www.osti.gov/servlets/purl/1259483.
@article{osti_1259483,
title = {Genome Sequence and Transcriptome Analyses of Chrysochromulina tobin: Metabolic Tools for Enhanced Algal Fitness in the Prominent Order Prymnesiales (Haptophyceae)},
author = {Hovde, Blake T. and Deodato, Chloe R. and Hunsperger, Heather M. and Ryken, Scott A. and Yost, Will and Jha, Ramesh K. and Patterson, Johnathan and Monnat, Raymond J. and Barlow, Steven B. and Starkenburg, Shawn R. and Cattolico, Rose Ann and Richardson, Paul M.},
abstractNote = {Haptophytes are recognized as seminal players in aquatic ecosystem function. These algae are important in global carbon sequestration, form destructive harmful blooms, and given their rich fatty acid content, serve as a highly nutritive food source to a broad range of eco-cohorts. Haptophyte dominance in both fresh and marine waters is supported by the mixotrophic nature of many taxa. Despite their importance the nuclear genome sequence of only one haptophyte, Emiliania huxleyi (Isochrysidales), is available. Here we report the draft genome sequence of Chrysochromulina tobin (Prymnesiales), and transcriptome data collected at seven time points over a 24-hour light/dark cycle. The nuclear genome of C. tobin is small (59 Mb), compact (~40% of the genome is protein coding) and encodes approximately 16,777 genes. Genes important to fatty acid synthesis, modification, and catabolism show distinct patterns of expression when monitored over the circadian photoperiod. The C. tobin genome harbors the first hybrid polyketide synthase/non-ribosomal peptide synthase gene complex reported for an algal species, and encodes potential anti-microbial peptides and proteins involved in multidrug and toxic compound extrusion. A new haptophyte xanthorhodopsin was also identified, together with two “red” RuBisCO activases that are shared across many algal lineages. In conclusion, the Chrysochromulina tobin genome sequence provides new information on the evolutionary history, ecology and economic importance of haptophytes.},
doi = {10.1371/journal.pgen.1005469},
journal = {PLoS Genetics},
number = 9,
volume = 11,
place = {United States},
year = {Wed Sep 23 00:00:00 EDT 2015},
month = {Wed Sep 23 00:00:00 EDT 2015}
}

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Figures / Tables:

Fig 1 Fig 1: Chrysochromulina tobin cell structure. (A) Scanning electron micrograph of C. tobin. Two flagella are visible (marked F) along with the prominent coiled haptonema (white arrow). Scale bar represents 2.5 microns. (B) Electron micrograph of whole cell: Lipid body (LB); Mitochondrion (M); Chloroplast (C). Scale bar represents 500 nanometers.

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