Green Evolution and Dynamic Adaptations Revealed by Genomes of the Marine Picoeukaryotes Micromonas

作者：Alexandra Z. Worden, Jae-Hyeok Lee, Thomas Möck, Pierre Rouzé, Melinda P. Simmons, Andrea L. Aerts, Andrew Ellis Allen, Marie L. Cuvelier, Évelyne Derelle, Meredith V. Everett, Elodie Foulon, Jane Grimwood, Heidrun Gundlach, Bernard Henrissat, Carolyn A. Napoli, Sarah M. McDonald, Micaela Schnitzler Parker, Stéphane Rombauts, Aasf Salamov, Peter von Dassow, Jonathan H. Badger, Pedro M. Coutinho, Elif Demir, Inna L Dubchak, Chelle Leigh Gentemann, Wenche Eikrem, Jill E. Gready, Uwe John, William P. Lanier, Erika Lindquist, Susan M. Lucas, Klaus Mayer, Hervé Moreau, Fabrice Not, Robert Otillar, Olivier Panaud, Jasmyn L. Pangilinan, Ian T. Paulsen, Benoît Piégu, Aaron Poliakov, Steven Robbens, Jeremy Schmutz, Ève Toulza, Tania Wyss, Alex N. Zelensky, Kemin Zhou, E. Virginia Armbrust, Debashish Bhattacharya, Ursula W Goodenough, Yves Van de Peer, Igor V. Grigoriev · 发表于：Science · 年份：2009 · DOI：10.1126/science.1167222 · 被引用次数：686 · 研究领域：Protist diversity and phylogeny、Genomics and Phylogenetic Studies、Microbial Community Ecology and Physiology

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.