Green evolution and dynamic adaptations revealed by genomes of the marine picoeukaryotes Micromonas.

Alexandra Z Worden (1) , Jae-Hyeok Lee , Thomas Mock (2) , Pierre Rouzé (3) , Melinda P Simmons (1) , Andrea L Aerts (4) , Andrew E Allen , Marie L Cuvelier (1) , Evelyne Derelle (5) , Meredith V Everett , Elodie Foulon (6) , Jane Grimwood (4, 7) , Heidrun Gundlach , Bernard Henrissat (8) , Carolyn Napoli (9) , Sarah M Mcdonald (1) , Micaela S Parker (2) , Stephane Rombauts (3) , Aasf Salamov (4) , Peter von Dassow (10) , Jonathan H Badger , Pedro M Coutinho (8) , Elif Demir (1) , Inna Dubchak (4) , Chelle Gentemann , Wenche Eikrem , Jill E Gready , Uwe John , William Lanier , Erika A Lindquist (4) , Susan Lucas (4) , Klaus F X Mayer (7) , Herve Moreau (5) , Fabrice Not (10) , Robert Otillar (4) , Olivier Panaud (11) , Jasmyn Pangilinan (4) , Ian Paulsen , Benoit Piegu (11) , Aaron Poliakov (4) , Steven Robbens (3) , Jeremy Schmutz (4, 7) , Eve Toulza , Tania Wyss , Alexander Zelensky , Kemin Zhou (4) , E Virginia Armbrust (2) , Debashish Bhattacharya , Ursula W Goodenough , Yves van de Peer (3) , Igor V Grigoriev (4)

1 MBARI - Monterey Bay Aquarium Research Institute
2 School of Oceanography [Seattle]
3 PSB Center - Center for Plant Systems Biology
4 DOE - Department of Energy / Joint Genome Institute
5 OOB - Observatoire océanologique de Banyuls
6 AD2M - Adaptation et diversité en milieu marin
7 Stanford School of Medicine [Stanford]
8 AFMB - Architecture et fonction des macromolécules biologiques
9 Biology Institute
10 SBR - Station biologique de Roscoff [Roscoff]
11 LGDP - Laboratoire Génome et développement des plantes

Picoeukaryotes are a taxonomically diverse group of organisms less than 2 micrometers in diameter. Photosynthetic marine picoeukaryotes in the genus Micromonas thrive in ecosystems ranging from tropical to polar and could serve as sentinel organisms for biogeochemical fluxes of modern oceans during climate change. These broadly distributed primary producers belong to an anciently diverged sister clade to land plants. Although Micromonas isolates have high 18S ribosomal RNA gene identity, we found that genomes from two isolates shared only 90% of their predicted genes. Their independent evolutionary paths were emphasized by distinct riboswitch arrangements as well as the discovery of intronic repeat elements in one isolate, and in metagenomic data, but not in other genomes. Divergence appears to have been facilitated by selection and acquisition processes that actively shape the repertoire of genes that are mutually exclusive between the two isolates differently than the core genes. Analyses of the Micromonas genomes offer valuable insights into ecological differentiation and the dynamic nature of early plant evolution.

Domaines: Biochimie, Biologie Moléculaire; Biologie cellulaire; Génétique; Biochimie [q-bio.BM]; Biologie moléculaire; Biologie structurale [q-bio.BM]; Génomique, Transcriptomique et Protéomique [q-bio.GN]; Réseaux moléculaires [q-bio.MN]; Evolution [q-bio.PE]; Systématique, phylogénie et taxonomie; Amélioration des plantes; Génétique des plantes; Bio-Informatique, Biologie Systémique [q-bio.QM]; Bio-informatique [q-bio.QM]; Biologie végétale

Alexandra Z Worden, Jae-Hyeok Lee, Thomas Mock, Pierre Rouzé, Melinda P Simmons, et al.. Green evolution and dynamic adaptations revealed by genomes of the marine picoeukaryotes Micromonas.. Science, 2009, 324 (5924), pp.268-72. ⟨10.1126/science.1167222⟩. ⟨hal-00693449⟩