Dynamics and Differential Proliferation of Transposable Elements During the Evolution of the B and A Genomes of Wheat
Identifieur interne : 008612 ( Main/Exploration ); précédent : 008611; suivant : 008613Dynamics and Differential Proliferation of Transposable Elements During the Evolution of the B and A Genomes of Wheat
Auteurs : Mathieu Charles [France] ; Harry Belcram [France] ; Jérémy Just [France] ; Cécile Huneau [France] ; Agnès Viollet [France] ; Arnaud Couloux [France] ; Béatrice Segurens [France] ; Meredith Carter [Australie] ; Virginie Huteau [France] ; Olivier Coriton [France] ; Rudi Appels [Australie] ; Sylvie Samain [France] ; Boulos Chalhoub [France]Source :
- Genetics [ 0016-6731 ] ; 2008.
Abstract
Transposable elements (TEs) constitute >80% of the wheat genome but their dynamics and contribution to size variation and evolution of wheat genomes (Triticum and Aegilops species) remain unexplored. In this study, 10 genomic regions have been sequenced from wheat chromosome 3B and used to constitute, along with all publicly available genomic sequences of wheat, 1.98 Mb of sequence (from 13 BAC clones) of the wheat B genome and 3.63 Mb of sequence (from 19 BAC clones) of the wheat A genome. Analysis of TE sequence proportions (as percentages), ratios of complete to truncated copies, and estimation of insertion dates of class I retrotransposons showed that specific types of TEs have undergone waves of differential proliferation in the B and A genomes of wheat. While both genomes show similar rates and relatively ancient proliferation periods for the
Url:
DOI: 10.1534/genetics.108.092304
PubMed: 18780739
PubMed Central: 2567357
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en"><p>Transposable elements (TEs) constitute >80% of the wheat genome but their dynamics and contribution to size variation and evolution of wheat genomes (Triticum and Aegilops species) remain unexplored. In this study, 10 genomic regions have been sequenced from wheat chromosome 3B and used to constitute, along with all publicly available genomic sequences of wheat, 1.98 Mb of sequence (from 13 BAC clones) of the wheat B genome and 3.63 Mb of sequence (from 19 BAC clones) of the wheat A genome. Analysis of TE sequence proportions (as percentages), ratios of complete to truncated copies, and estimation of insertion dates of class I retrotransposons showed that specific types of TEs have undergone waves of differential proliferation in the B and A genomes of wheat. While both genomes show similar rates and relatively ancient proliferation periods for the <italic>Athila</italic>
retrotransposons, the <italic>Copia</italic>
retrotransposons proliferated more recently in the A genome whereas <italic>Gypsy</italic>
retrotransposon proliferation is more recent in the B genome. It was possible to estimate for the first time the proliferation periods of the abundant <italic>CACTA</italic>
class II DNA transposons, relative to that of the three main retrotransposon superfamilies. Proliferation of these TEs started prior to and overlapped with that of the <italic>Athila</italic>
retrotransposons in both genomes. However, they also proliferated during the same periods as <italic>Gypsy</italic>
and <italic>Copia</italic>
retrotransposons in the A genome, but not in the B genome. As estimated from their insertion dates and confirmed by PCR-based tracing analysis, the majority of differential proliferation of TEs in B and A genomes of wheat (87 and 83%, respectively), leading to rapid sequence divergence, occurred prior to the allotetraploidization event that brought them together in <italic>Triticum turgidum</italic>
and <italic>Triticum aestivum</italic>
, <0.5 million years ago. More importantly, the allotetraploidization event appears to have neither enhanced nor repressed retrotranspositions. We discuss the apparent proliferation of TEs as resulting from their insertion, removal, and/or combinations of both evolutionary forces.</p>
</div>
</front>
</TEI>
<affiliations><list><country><li>Australie</li>
<li>France</li>
</country>
<region><li>Île-de-France</li>
</region>
<settlement><li>Evry</li>
</settlement>
</list>
<tree><country name="France"><region name="Île-de-France"><name sortKey="Charles, Mathieu" sort="Charles, Mathieu" uniqKey="Charles M" first="Mathieu" last="Charles">Mathieu Charles</name>
</region>
<name sortKey="Belcram, Harry" sort="Belcram, Harry" uniqKey="Belcram H" first="Harry" last="Belcram">Harry Belcram</name>
<name sortKey="Chalhoub, Boulos" sort="Chalhoub, Boulos" uniqKey="Chalhoub B" first="Boulos" last="Chalhoub">Boulos Chalhoub</name>
<name sortKey="Coriton, Olivier" sort="Coriton, Olivier" uniqKey="Coriton O" first="Olivier" last="Coriton">Olivier Coriton</name>
<name sortKey="Couloux, Arnaud" sort="Couloux, Arnaud" uniqKey="Couloux A" first="Arnaud" last="Couloux">Arnaud Couloux</name>
<name sortKey="Huneau, Cecile" sort="Huneau, Cecile" uniqKey="Huneau C" first="Cécile" last="Huneau">Cécile Huneau</name>
<name sortKey="Huteau, Virginie" sort="Huteau, Virginie" uniqKey="Huteau V" first="Virginie" last="Huteau">Virginie Huteau</name>
<name sortKey="Just, Jeremy" sort="Just, Jeremy" uniqKey="Just J" first="Jérémy" last="Just">Jérémy Just</name>
<name sortKey="Samain, Sylvie" sort="Samain, Sylvie" uniqKey="Samain S" first="Sylvie" last="Samain">Sylvie Samain</name>
<name sortKey="Segurens, Beatrice" sort="Segurens, Beatrice" uniqKey="Segurens B" first="Béatrice" last="Segurens">Béatrice Segurens</name>
<name sortKey="Viollet, Agnes" sort="Viollet, Agnes" uniqKey="Viollet A" first="Agnès" last="Viollet">Agnès Viollet</name>
</country>
<country name="Australie"><noRegion><name sortKey="Carter, Meredith" sort="Carter, Meredith" uniqKey="Carter M" first="Meredith" last="Carter">Meredith Carter</name>
</noRegion>
<name sortKey="Appels, Rudi" sort="Appels, Rudi" uniqKey="Appels R" first="Rudi" last="Appels">Rudi Appels</name>
</country>
</tree>
</affiliations>
</record>
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