Evolutionary genomics of the cold-adapted diatom Fragilariopsis cylindrus. - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Nature Année : 2017

Evolutionary genomics of the cold-adapted diatom Fragilariopsis cylindrus.

Jan Strauss
  • Fonction : Auteur
Mark Mcmullan
  • Fonction : Auteur
Pirita Paajanen
  • Fonction : Auteur
Remo Sanges
Andrew Toseland
  • Fonction : Auteur
Andrew E Allen
  • Fonction : Auteur
Florian Maumus
Alaguraj Veluchamy
Rachel Hipkin
  • Fonction : Auteur
Barbara R Lyon
  • Fonction : Auteur
Joel Martin
Chris Mayer
  • Fonction : Auteur
Hadi Quesneville
James A Raymond
  • Fonction : Auteur
Chris Uhlig
  • Fonction : Auteur
Ruben E Valas
  • Fonction : Auteur
Matthew D Clark
  • Fonction : Auteur
Chris Bowler

Résumé

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.

Dates et versions

hal-01587937 , version 1 (14-09-2017)

Identifiants

Citer

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