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doi:10.1534/genetics.108.089615
A more recent version of this article appeared on September 1, 2008.
REGULAR RESEARCH PAPERS |
Different strategies to persist: the pogo-like Lemi1 transposon produces MITEs or typical defective elements in different plant genomes
Hélène Guermonprez 1, Céline Loot 1 and Josep M. Casacuberta 1*
1 CRAG
* To whom correspondence should be addressed. E-mail: jcsgmp{at}cid.csic.es.
Submitted on March 27, 2008
Revised on May 9, 2008
Accepted on 16 July 2008
MITEs are a particular type of defective class II elements present in genomes as high copy number populations of small and highly homogeneous elements. While virtually all class II transposon families contain non-autonomous defective transposon copies, only a subset of them have a related MITE family. At present it is not known in which circumstances MITEs are generated instead of typical class II defective transposons. The ability to produce MITEs could be an exclusive characteristic of particular transposases, could be related to a particular structure of certain defective class II elements, or could be the consequence of particular constraints imposed by certain host genomes on transposon populations. We describe here a new family of pogo-like transposons from Medicago truncatula closely related to the Arabidopsis Lemi1 element that we have named as MtLemi1. Contrarily to the Arabidopsis Lemi1, present as a single copy element and associated to hundreds of related Emigrant MITEs, MtLemi1 has attained more than 30 copies and has not generated MITEs. This shows that a particular transposon can adopt completely different strategies to colonise genomes. The comparison of AtLemi1 and MtLemi1 reveals transposase specific domains and possible regulatory sequences that could be linked to the ability to produce MITEs.
Key Words: Arabidopsis, MITEs, Medicago truncatula, defective class II transposons
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