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MBE Advance Access originally published online on August 4, 2008
Molecular Biology and Evolution 2008 25(11):2293-2300; doi:10.1093/molbev/msn168
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© The Author 2008. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Research Articles

Clues about the Genetic Basis of Adaptation Emerge from Comparing the Proteomes of Two Ostreococcus Ecotypes (Chlorophyta, Prasinophyceae)

Séverine Jancek*,{dagger}, Sébastien Gourbière{ddagger}, Hervé Moreau*,{dagger} and Gwenaël Piganeau*,{dagger}

* UPMC University of Paris 06, UMR 7628, MBCE, Observatoire Océanologique, Banyuls/mer, France
{dagger} CNRS, UMR 7628, MBCE, Observatoire Océanologique, Banyuls/mer, France
{ddagger} Université de Perpignan Via Domitia, Laboratoire de Mathématiques, Physiques et Systèmes, EA 4217, Perpignan, France

E-mail: gwenael.piganeau{at}obs-banyuls.fr.

Accepted for publication July 21, 2008.

We compared the proteomes of two picoplanktonic Ostreococcus unicellular green algal ecotypes to analyze the genetic basis of their adaptation with their ecological niches. We first investigated the function of the species-specific genes using Gene Ontology databases and similarity searches. Although most species-specific genes had no known function, we identified several species-specific functions involved in various cellular processes, which could be critical for environmental adaptations. Additionally, we investigated the rate of evolution of orthologous genes and its distribution across chromosomes. We show that faster evolving genes encode significantly more membrane or excreted proteins, consistent with the notion that selection acts on cell surface modifications that is driven by selection for resistance to viruses and grazers, keystone actors of phytoplankton evolution. The relationship between GC content and chromosome length also suggests that both strains have experienced recombination since their divergence and that lack of recombination on the two outlier chromosomes could explain part of their peculiar genomic features, including higher rates of evolution.

Key Words: picoeukaryotes • genome comparison • GC content • selection • adaptation

Charles Delwiche, Associate Editor


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