Structural variability of Tvv1 grapevine retrotransposons can be caused by illegitimate recombination

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
Cédric MoisyFrédérique Pelsy

Abstract

Structural variability of Tvv1, a grapevine retrotransposon Ty1 copia-like family, was investigated within the grape genome and the canonical sequence of Tvv1 determined. Then, two remarkable elements, Tvv1-Delta3001 and Tvv1-Delta3640, which had suffered large deletions 3,001 bp and 3,460 bp in length of their coding sequences were compared to the canonical copy. In both deleted elements, the deletion breakpoint was characterized by a stretch 13 bp-long in Tvv1-Delta3001 and 11 bp-long in Tvv1-Delta3640 found duplicated in the canonical copy at each bound of the deleted regions. Tvv1-Delta3001 and Tvv1-Delta3460 were both shown to be unique copies fixed at a single locus in the grapevine genome. Their presence was very variable in a set of 58 varieties and wild vines. These elements have most likely been dispersed through natural intermixing after their initial insertion whose chronology was estimated. The model that we propose to explain the structure of Tvv1-Delta3001 and Tvv1-Delta3640, implies illegitimate recombination involving template switching between two RNA molecules co-packaged in the VLP prior to the integration of the deleted daughter copy into the host genome.

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Citations

Mar 5, 2014·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Cédric MoisyFrédérique Pelsy
Feb 28, 2019·American Journal of Physiology. Renal Physiology·Rohan S BalkawadeCaroline B Marshall

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