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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)

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; WSYN_BIO; DGE-0718124; DGE-1256082; 1RL1CA133831; NA07OAR-4170007
OSTI ID:
1259483
Journal Information:
PLoS Genetics, Vol. 11, Issue 9; ISSN 1553-7404
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 53 works
Citation information provided by
Web of Science

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A simple protocol for the isolation of proteorhodopsins of the dinoflagellate Oxyrrhis marina journal January 2020
Collection of antimicrobial peptides database and its derivatives: Applications and beyond journal September 2019
DSYB catalyses the key step of dimethylsulfoniopropionate biosynthesis in many phytoplankton journal February 2018
Genetic tool development in marine protists: emerging model organisms for experimental cell biology journal April 2020
Mono- and digalactosyldiacylglycerol composition of dinoflagellates. VIII. Temperature effects and a perspective on the curious case of Karenia mikimotoi as a producer of the unusual, ‘green algal’ fatty acid hexadecatetraenoic acid [16:4(n-3)] journal December 2018
Diurnal Transcriptional Regulation of Endosymbiotically Derived Genes in the Chlorarachniophyte Bigelowiella natans journal August 2016
Multimodular type I polyketide synthases in algae evolve by module duplications and displacement of AT domains in trans journal November 2015
Daily changes in phytoplankton lipidomes reveal mechanisms of energy storage in the open ocean journal December 2018
Genetic tool development in marine protists: Emerging model organisms for experimental cell biology journal April 2020
RNAi-based targeted gene knockdown in the model oleaginous microalgae Nannochloropsis oceanica journal February 2017
Genetic tool development in marine protists: emerging model organisms for experimental cell biology. text January 2020
Genetic tool development in marine protists: emerging model organisms for experimental cell biology text January 2020
Genetic tool development in marine protists: emerging model organisms for experimental cell biology text January 2020
The role of Rubisco kinetics and pyrenoid morphology in shaping the CCM of haptophyte microalgae journal June 2017
Genome Sequences of Eight Bacterial Species Found in Coculture with the Haptophyte Chrysochromulina tobin journal December 2016
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

Figures / Tables (14)