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Evolutionary genomics of the cold-Adapted diatom Fragilariopsis cylindrus

Mock, Thomas
•
Otillar, Robert P.
•
Strauss, Jan
altro
Grigoriev, Igor V.
2017
  • journal article

Periodico
NATURE
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.
DOI
10.1038/nature20803
WOS
WOS:000396116600052
Archivio
http://hdl.handle.net/20.500.11767/68482
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85016137064
http://www.nature.com/nature/index.html
Diritti
open access
Soggetti
  • Acclimatization

  • Allele

  • Carbon Dioxide

  • Darkne

  • Diatom

  • Freezing

  • Gene Expression Profi...

  • Genetic Drift

  • Genome

  • Ice Cover

  • Iron

  • Mutation Rate

  • Oceans and Sea

  • Phylogeny

  • Recombination, Geneti...

  • Transcriptome

  • Cold Temperature

  • Evolution, Molecular

  • Genomic

  • Multidisciplinary

  • Settore BIO/13 - Biol...

Scopus© citazioni
198
Data di acquisizione
Jun 2, 2022
Vedi dettagli
Web of Science© citazioni
227
Data di acquisizione
Mar 18, 2024
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