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The $Ectocarpus$ genome and the independent evolution of multicellularity in brown algae

J. Mark Cock 1 Lieven Sterck 2 Pierre Rouzé 2 Delphine Scornet 1 Andrew E. Allen 3 Grigoris Amoutzias 2 Véronique Anthouard 4 François Artiguenave 4 Jean-Marc Aury 4 Jonathan H Badger 3 Bank Beszteri 5 Kenny Billiau 2 Eric Bonnet 2 John H. Bothwell 6 Chris Bowler 7 Catherine Boyen 1 Colin Brownlee 6 Carl J Carrano 8 Bénédicte Charrier 1 Ga Youn Cho 1 Susana M Coelho 1 Jonas Collén 1, 9 Erwan Corre 10 Corinne da Silva 4 Ludovic Delage 1 Nicolas Delaroque 11 Simon M. Dittami 1 Sylvie Doulbeau 12 Marek Elias 13 Garry Farnham 6 Claire M. M. Gachon 14 Bernhard Gschloessl 1 Svenja Heesch 1 Kamel Jabbari 4, 7 Claire Jubin 4 Hiroshi Kawai 15 Kei Kimura 16 Bernard Kloareg 1 Frithjof C. Küpper 14 Daniel Lang 17 Aude Le Bail 1 Catherine Leblanc 1, 18 Patrice Lerouge 19 Martin Lohr 20 Pascal J Lopez 21 Cindy Martens 2 Florian Maumus 22 Gurvan Michel 1 Diego Miranda-Saavedra 23 Julia Morales 24 Hervé Moreau 25 Taizo Motomura 16 Chikako Nagasato 16 Carolyn A Napoli 26 David R Nelson 27 Pi Nyvall-Collén 1 Akira F Peters 1 Cyril Pommier 28 Philippe Potin 1 Julie Poulain 4 Hadi Quesneville 28 Betsy Read 29 Stefan A. Rensing 17 Andrés Ritter 1, 30 Sylvie Rousvoal 1 Manoj Samanta 31 Gaelle Samson 4 Declan C Schroeder 6 Béatrice Ségurens 4 Martina Strittmatter 14 Thierry Tonon 1 James W Tregear 12 Klaus Valentin 5 Peter von Dassow 18 Takahiro Yamagishi 15 Yves van de Peer 2 Patrick Wincker 4 
Abstract : Brown algae (Phaeophyceae) are complex photosynthetic organisms with a very different evolutionary history to green plants, to which they are only distantly related(1). These seaweeds are the dominant species in rocky coastal ecosystems and they exhibit many interesting adaptations to these, often harsh, environments. Brown algae are also one of only a small number of eukaryotic lineages that have evolved complex multicellularity (Fig. 1). We report the 214 million base pair (Mbp) genome sequence of the filamentous seaweed Ectocarpus siliculosus (Dillwyn) Lyngbye, a model organism for brown algae(2-5), closely related to the kelps(6,7) (Fig. 1). Genome features such as the presence of an extended set of light-harvesting and pigment biosynthesis genes and new metabolic processes such as halide metabolism help explain the ability of this organism to cope with the highly variable tidal environment. The evolution of multicellularity in this lineage is correlated with the presence of a rich array of signal transduction genes. Of particular interest is the presence of a family of receptor kinases, as the independent evolution of related molecules has been linked with the emergence of multicellularity in both the animal and green plant lineages. The Ectocarpus genome sequence represents an important step towards developing this organism as a model species, providing the possibility to combine genomic and genetic(2) approaches to explore these and other(4,5) aspects of brown algal biology further.
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J. Mark Cock, Lieven Sterck, Pierre Rouzé, Delphine Scornet, Andrew E. Allen, et al.. The $Ectocarpus$ genome and the independent evolution of multicellularity in brown algae. Nature, Nature Publishing Group, 2010, 465 (7298), pp.617-621. ⟨10.1038/nature09016⟩. ⟨cea-00906990⟩



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