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Genetica. 2005 Nov;125(2-3):325-32.

Advent of a new retrotransposon structure: the long form of the Veju elements.

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UMR INRA/UBP 1095 Amélioration & Santé des Plantes, 234 Avenue du Brézet, F-63100 Clermont-Ferrand, France.


Transposable elements are the main component of plant genomes, especially in grass species. In a previous analysis, we have identified two unusual types of Class I elements, two homologous Veju TRIM elements, but with an unusual long structure. They are formed by the junction of a yet unidentified segment labelled unknown DNA, flanked by the borders of the classical Veju element. Here, we show that the long (Veju_L) and the short forms (Veju_S) coexist within wheat genomes. The associated unknown DNA had always the same origin, and the Veju_L came probably from either illegitimate recombinations or 'template switching' between the Veju_S and another unique unknown DNA sequence. This junction then evolved differently within wheat genomes.

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