Doubling genome size without polyploidization: dynamics of retrotransposition-driven genomic expansions in Oryza australiensis, a wild relative of rice

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dc.creatorPiegu, Benoit
dc.creatorGuyot, Romain
dc.creatorPicault, Nathalie
dc.creatorRoulin, Anne
dc.creatorSaniyal, Abhijit
dc.creatorKim, Hyeran
dc.creatorCollura, Kristi
dc.creatorBrar, Darshan S.
dc.creatorJackson, Scott
dc.creatorWing, Rod A.
dc.creatorPanaud, Olivier
dc.date2006-10
dc.date2024-12-19T12:56:23Z
dc.date2024-12-19T12:56:23Z
dc.date.accessioned2026-06-27T04:14:35Z
dc.descriptionRetrotransposons 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.
dc.identifierhttps://hdl.handle.net/10568/166565
dc.identifier.urihttp://hdl.handle.net/123456789/26302
dc.languageen
dc.publisherCold Spring Harbor Laboratory
dc.sourcePiegu, Benoit; Guyot, Romain; Picault, Nathalie; Roulin, Anne; Saniyal, Abhijit; Kim, Hyeran; Collura, Kristi; Brar, Darshan S.; Jackson, Scott; Wing, Rod A. and Panaud, Olivier. 2006. Doubling genome size without polyploidization: dynamics of retrotransposition-driven genomic expansions in Oryza australiensis, a wild relative of rice. Genome Res., Volume 16 no. 10 p. 1262-1269
dc.subjectgenomes
dc.subjectphenetics
dc.subjectretrotransposons
dc.subjecttransposition
dc.subjectwild relatives
dc.subjectoryza australiensis
dc.titleDoubling genome size without polyploidization: dynamics of retrotransposition-driven genomic expansions in Oryza australiensis, a wild relative of rice
dc.typeJournal Article

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Instituto Internacional de Investigación del Arroz (IRRI)