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

Journal Article · · PLoS Genetics
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  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)
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.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
EE0003046
OSTI ID:
1259483
Journal Information:
PLoS Genetics, Journal Name: PLoS Genetics Journal Issue: 9 Vol. 11; ISSN 1553-7404
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Genome Sequences of Eight Bacterial Species Found in Coculture with the Haptophyte Chrysochromulina tobin journal December 2016
Multimodular type I polyketide synthases in algae evolve by module duplications and displacement of AT domains in trans journal November 2015
Differential Regulation of Duplicate Light-Dependent Protochlorophyllide Oxidoreductases in the Diatom Phaeodactylum tricornutum journal July 2016
Mining Natural Product Biosynthesis in Eukaryotic Algae journal January 2020
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DSYB catalyses the key step of dimethylsulfoniopropionate biosynthesis in many phytoplankton journal February 2018
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