TY - JOUR
T1 - Genome structure and metabolic features in the red seaweed Chondrus crispus shed light on evolution of the Archaeplastida
AU - Collén, Jonas
AU - Porcel, Betina
AU - Carré, Wilfrid
AU - Ball, Steven G
AU - Chaparro, Cristian
AU - Tonon, Thierry
AU - Barbeyron, Tristan
AU - Michel, Gurvan
AU - Noel, Benjamin
AU - Valentin, Klaus
AU - Elias, Marek
AU - Artiguenave, François
AU - Arun, Alok
AU - Aury, Jean-Marc
AU - Barbosa-Neto, José F
AU - Bothwell, John H
AU - Bouget, François-Yves
AU - Brillet, Loraine
AU - Cabello-Hurtado, Francisco
AU - Capella-Gutiérrez, Salvador
AU - Charrier, Bénédicte
AU - Cladière, Lionel
AU - Cock, J Mark
AU - Coelho, Susana M
AU - Colleoni, Christophe
AU - Czjzek, Mirjam
AU - Da Silva, Corinne
AU - Delage, Ludovic
AU - Denoeud, France
AU - Deschamps, Philippe
AU - Dittami, Simon M
AU - Gabaldón, Toni
AU - Gachon, Claire M M
AU - Groisillier, Agnès
AU - Hervé, Cécile
AU - Jabbari, Kamel
AU - Katinka, Michael
AU - Kloareg, Bernard
AU - Kowalczyk, Nathalie
AU - Labadie, Karine
AU - Leblanc, Catherine
AU - Lopez, Pascal J
AU - McLachlan, Deirdre H
AU - Meslet-Cladiere, Laurence
AU - Moustafa, Ahmed
AU - Nehr, Zofia
AU - Nyvall Collén, Pi
AU - Panaud, Olivier
AU - Partensky, Frédéric
AU - Poulain, Julie
AU - Rensing, Stefan A
AU - Rousvoal, Sylvie
AU - Samson, Gaelle
AU - Symeonidi, Aikaterini
AU - Weissenbach, Jean
AU - Zambounis, Antonios
AU - Wincker, Patrick
AU - Boyen, Catherine
PY - 2013/3/26
Y1 - 2013/3/26
N2 - Red seaweeds are key components of coastal ecosystems and are economically important as food and as a source of gelling agents, but their genes and genomes have received little attention. Here we report the sequencing of the 105-Mbp genome of the florideophyte Chondrus crispus (Irish moss) and the annotation of the 9,606 genes. The genome features an unusual structure characterized by gene-dense regions surrounded by repeat-rich regions dominated by transposable elements. Despite its fairly large size, this genome shows features typical of compact genomes, e.g., on average only 0.3 introns per gene, short introns, low median distance between genes, small gene families, and no indication of large-scale genome duplication. The genome also gives insights into the metabolism of marine red algae and adaptations to the marine environment, including genes related to halogen metabolism, oxylipins, and multicellularity (microRNA processing and transcription factors). Particularly interesting are features related to carbohydrate metabolism, which include a minimalistic gene set for starch biosynthesis, the presence of cellulose synthases acquired before the primary endosymbiosis showing the polyphyly of cellulose synthesis in Archaeplastida, and cellulases absent in terrestrial plants as well as the occurrence of a mannosylglycerate synthase potentially originating from a marine bacterium. To explain the observations on genome structure and gene content, we propose an evolutionary scenario involving an ancestral red alga that was driven by early ecological forces to lose genes, introns, and intergenetic DNA; this loss was followed by an expansion of genome size as a consequence of activity of transposable elements.
AB - Red seaweeds are key components of coastal ecosystems and are economically important as food and as a source of gelling agents, but their genes and genomes have received little attention. Here we report the sequencing of the 105-Mbp genome of the florideophyte Chondrus crispus (Irish moss) and the annotation of the 9,606 genes. The genome features an unusual structure characterized by gene-dense regions surrounded by repeat-rich regions dominated by transposable elements. Despite its fairly large size, this genome shows features typical of compact genomes, e.g., on average only 0.3 introns per gene, short introns, low median distance between genes, small gene families, and no indication of large-scale genome duplication. The genome also gives insights into the metabolism of marine red algae and adaptations to the marine environment, including genes related to halogen metabolism, oxylipins, and multicellularity (microRNA processing and transcription factors). Particularly interesting are features related to carbohydrate metabolism, which include a minimalistic gene set for starch biosynthesis, the presence of cellulose synthases acquired before the primary endosymbiosis showing the polyphyly of cellulose synthesis in Archaeplastida, and cellulases absent in terrestrial plants as well as the occurrence of a mannosylglycerate synthase potentially originating from a marine bacterium. To explain the observations on genome structure and gene content, we propose an evolutionary scenario involving an ancestral red alga that was driven by early ecological forces to lose genes, introns, and intergenetic DNA; this loss was followed by an expansion of genome size as a consequence of activity of transposable elements.
KW - Base Sequence
KW - Chondrus/genetics
KW - Evolution, Molecular
KW - Genes, Plant
KW - MicroRNAs/genetics
KW - Molecular Sequence Data
KW - Plant Proteins/genetics
KW - RNA, Plant/genetics
U2 - 10.1073/pnas.1221259110
DO - 10.1073/pnas.1221259110
M3 - Article
C2 - 23503846
SN - 0027-8424
VL - 110
SP - 5247
EP - 5252
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 13
ER -