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Evolutionary genomics of the cold-adapted diatom Fragilariopsis cylindrus.

Thomas Mock 1 Robert P Otillar 2 Jan Strauss Mark Mcmullan Pirita Paajanen Jeremy Schmutz 3, 2 Asaf Salamov 2 Remo Sanges 4 Andrew Toseland Ben J Ward 5 Andrew E Allen Chris Dupont 6 Stephan Frickenhaus 7 Florian Maumus 8 Alaguraj Veluchamy Taoyang Wu 9 Kerrie W Barry 10 Angela Falciatore 11 Maria I Ferrante 4 Antonio E Fortunato 11 Gernot Glöckner 12 Ansgar Gruber 13 Rachel Hipkin Michael G Janech 14 Peter G Kroth 15 Florian Leese 16 Erika A Lindquist 2 Barbara R Lyon Joel Martin Chris Mayer Micaela Parker 17 Hadi Quesneville 8 James A Raymond Chris Uhlig Ruben E Valas Klaus U Valentin 7 Alexandra Z Worden 18, 19, 20 E Virginia Armbrust 21 Matthew D Clark Chris Bowler Beverley R Green 22 Vincent Moulton 23 Cock van Oosterhout 24 Igor V Grigoriev 25
Abstract : The Southern Ocean houses a diverse and productive community of organisms. Unicellular eukaryotic diatoms are the main primary producers in this environment, where photosynthesis is limited by low concentrations of dissolved iron and large seasonal fluctuations in light, temperature and the extent of sea ice. How diatoms have adapted to this extreme environment is largely unknown. Here we present insights into the genome evolution of a cold-adapted diatom from the Southern Ocean, Fragilariopsis cylindrus, based on a comparison with temperate diatoms. We find that approximately 24.7 per cent of the diploid F. cylindrus genome consists of genetic loci with alleles that are highly divergent (15.1 megabases of the total genome size of 61.1 megabases). These divergent alleles were differentially expressed across environmental conditions, including darkness, low iron, freezing, elevated temperature and increased CO2. Alleles with the largest ratio of non-synonymous to synonymous nucleotide substitutions also show the most pronounced condition-dependent expression, suggesting a correlation between diversifying selection and allelic differentiation. Divergent alleles may be involved in adaptation to environmental fluctuations in the Southern Ocean.
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Contributor : Francesco Oteri Connect in order to contact the contributor
Submitted on : Thursday, September 14, 2017 - 6:49:22 PM
Last modification on : Tuesday, November 16, 2021 - 5:23:38 AM

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Thomas Mock, Robert P Otillar, Jan Strauss, Mark Mcmullan, Pirita Paajanen, et al.. Evolutionary genomics of the cold-adapted diatom Fragilariopsis cylindrus.. Nature, Nature Publishing Group, 2017, 541, pp.536-540. ⟨10.1038/nature20803⟩. ⟨hal-01587937⟩



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