Pan genome of the phytoplankton Emiliania underpins its global distribution

• Published in: Nature (London) 2013-07, Vol.499 (7457), p.209-213
• Main Authors: Read, Betsy A., Kegel, Jessica, Klute, Mary J., Kuo, Alan, Lefebvre, Stephane C., Maumus, Florian, Mayer, Christoph, Miller, John, Monier, Adam, Salamov, Asaf, Young, Jeremy, Aguilar, Maria, Claverie, Jean-Michel, Frickenhaus, Stephan, Gonzalez, Karina, Herman, Emily K., Lin, Yao-Cheng, Napier, Johnathan, Ogata, Hiroyuki, Sarno, Analissa F., Shmutz, Jeremy, Schroeder, Declan, de Vargas, Colomban, Verret, Frederic, von Dassow, Peter, Valentin, Klaus, Van de Peer, Yves, Wheeler, Glen, Dacks, Joel B., Delwiche, Charles F., Dyhrman, Sonya T., Glöckner, Gernot, John, Uwe, Richards, Thomas, Worden, Alexandra Z., Zhang, Xiaoyu, Grigoriev, Igor V.
• Format: Article
• Language: English
• Subjects: 631/208/726/649; Algae; Biochemistry, Molecular Biology; Calcification, Physiologic; Calcite; Calcium - metabolism; Calcium carbonate; Carbon; Carbon cycle; Carbon fixation; Carbonic Anhydrases - genetics; Carbonic Anhydrases - metabolism; Coccolithus huxleyi; Comparative analysis; Distribution; Ecological genetics; Ecosystem; Emiliania; Emiliania huxleyi; Environmental conditions; Genetic aspects; Genome - genetics; Genomes; Genomics; Global climate; Haptophyta - classification; Haptophyta - genetics; Haptophyta - isolation & purification; Haptophyta - metabolism; Harbors; Humanities and Social Sciences; letter; Life Sciences; Marine ecology; multidisciplinary; Ocean floor; Oceans and Seas; Organic matter; Phylogeny; Phytoplankton; Phytoplankton - genetics; Plankton; Proteins; Proteome - genetics; Prymnesiophytes; Science; Seawater; Signal transduction; Vitamins; Zinc
• ISSN: 0028-0836; 1476-4687
• DOI: 10.1038/nature12221

A reference genome from the coccolithophore Emiliania huxleyi is presented, along with sequences from 13 additional isolates, revealing a pan genome comprising core genes and genes variably distributed between strains: E. huxleyi is found to harbour extensive genetic variability under different metabolic repertoires, explaining its ability to thrive under a diverse range of environmental conditions. Emiliania genomes reveal great diversity This paper presents a reference genome from the coccolithophore Emiliania huxleyi strain CCMP1516. Coccolithophores are a major component of marine phytoplankton and can account for 20% of total carbon fixation in some systems, so have an important influence on global climate. Comparison of the reference genome to sequences from 13 other strains reveals a pan genome composed of core genes and genes variably distributed between strains. The findings indicate extensive genome variability reflected in different metabolic repertoires, explaining in part how E. huxleyi can thrive and form large-scale episodic blooms under a wide variety of environments. Coccolithophores have influenced the global climate for over 200 million years 1 . These marine phytoplankton can account for 20 per cent of total carbon fixation in some systems 2 . They form blooms that can occupy hundreds of thousands of square kilometres and are distinguished by their elegantly sculpted calcium carbonate exoskeletons (coccoliths), rendering them visible from space 3 . Although coccolithophores export carbon in the form of organic matter and calcite to the sea floor, they also release CO 2 in the calcification process. Hence, they have a complex influence on the carbon cycle, driving either CO 2 production or uptake, sequestration and export to the deep ocean 4 . Here we report the first haptophyte reference genome, from the coccolithophore Emiliania huxleyi strain CCMP1516, and sequences from 13 additional isolates. Our analyses reveal a pan genome (core genes plus genes distributed variably between strains) probably supported by an atypical complement of repetitive sequence in the genome. Comparisons across strains demonstrate that E. huxleyi , which has long been considered a single species, harbours extensive genome variability reflected in different metabolic repertoires. Genome variability within this species complex seems to underpin its capacity both to thrive in habitats ranging from the equator to the subarctic and to form large-scale episodic blo