Doubling genome size without polyploidization: Dynamics of retrotransposition-driven genomic expansions in Oryza australiensis, a wild relative of rice
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- 8 September 2006
- journal article
- research article
- Published by Cold Spring Harbor Laboratory in Genome Research
- Vol. 16 (10), 1262-1269
- https://doi.org/10.1101/gr.5290206
Abstract
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.Keywords
This publication has 44 references indexed in Scilit:
- The map-based sequence of the rice genomeNature, 2005
- Evidence and Consequence of Porcine Endogenous Retrovirus RecombinationJournal of Virology, 2004
- Genomic paleontology provides evidence for two distinct origins of Asian rice (Oryza sativa L.)Molecular Genetics and Genomics, 2004
- Analyses of LTR-Retrotransposon Structures Reveal Recent and Rapid Genomic DNA Loss in RiceGenome Research, 2004
- Rapid Genome Divergence at Orthologous Low Molecular Weight Glutenin Loci of the A and Am Genomes of Wheat[W]THE PLANT CELL ONLINE, 2003
- SEAVIEW and PHYLO_WIN: two graphic tools for sequence alignment and molecular phylogenyBioinformatics, 1996
- Substitution rate comparisons between grasses and palms: synonymous rate differences at the nuclear gene Adh parallel rate differences at the plastid gene rbcL.Proceedings of the National Academy of Sciences of the United States of America, 1996
- A dot-matrix program with dynamic threshold control suited for genomic DNA and protein sequence analysisGene, 1995
- Basic Local Alignment Search ToolJournal of Molecular Biology, 1990
- Basic local alignment search toolJournal of Molecular Biology, 1990