Piegu B., Guyot Romain, Picault N., Roulin A., Saniyal A., Kim H., Collura K., Brar D.S., Jackson S., Wing R.A., Panaud O. (2006). Doubling genome size without polyploidization : dynamics of retrotransposition-driven genomic expansions in Oryza australiensis, a wild relative of rice. Genome Research, 16 (10), p. 1262-1269. ISSN 1088-9051.
Titre du document
Doubling genome size without polyploidization : dynamics of retrotransposition-driven genomic expansions in Oryza australiensis, a wild relative of rice
Année de publication
2006
Auteurs
Piegu B., Guyot Romain, Picault N., Roulin A., Saniyal A., Kim H., Collura K., Brar D.S., Jackson S., Wing R.A., Panaud O.
Source
Genome Research, 2006,
16 (10), p. 1262-1269 ISSN 1088-9051
Retrotransposons are the main components of eukaryotic genomes, representing up to 80% of some large plant genomes. These mobile elements transpose via a "copy and paste" mechanism, thus increasing their copy number while active. Their accumulation is now accepted as the main factor of genome size increase in higher eukaryotes, besides polyploidy. However, the dynamics of this process are poorly understood. In this study, we show that Oryza australiensis, a wild relative of the Asian cultivated rice O. sativa, has undergone recent bursts of three LTR-retrotransposon families. This genome has accumulated more than 90,000 retrotransposon copies during the last three million years, leading to a rapid twofold increase of its size. In addition, phenetic analyses of these retrotransposons clearly confirm that the genomic bursts occurred posterior to the radiation of the species. This provides direct evidence of retrotransposon-mediated variation of genome size within a plant genus.
Plan de classement
Sciences du monde végétal [076]
Localisation
Fonds IRD [F A010037666]
Identifiant IRD
fdi:010037666
