Terminal-repeat Retrotransposons with GAG domain (TR-GAG) in plant genomes: A new testimony on the complex world of transposable elements

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Chaparro, Cristian | Gayraud, Thomas | de Souza, Rogerio Fernandes | Domingues, Douglas Silva | Akaffou, Sélastique Doffou | Laforga Vanzela, Andre Luis | de Kochko, Alexandre | Rigoreau, Michel | Crouzillat, Dominique | Hamon, Serge | Hamon, Perla | Guyot, Romain

Edité par CCSD ; Society for Molecular Biology and Evolution -

International audience. A novel structure of nonautonomous long terminal repeat (LTR) retrotransposons called terminal repeat with GAG domain (TR-GAG) has been described in plants, both in monocotyledonous, dicotyledonous and basal angiosperm genomes. TR-GAGs are relatively short elements in length (<4 kb) showing the typical features of LTR-retrotransposons. However, they carry only one open reading frame coding for the GAG precursor protein involved for instance in transposition, the assembly, and the packaging of the element into the virus-like particle. GAG precursors show similarities with both Copia and Gypsy GAG proteins, suggesting evolutionary relationships of TR-GAG elements with both families. Despite the lack of the enzymatic machinery required for their mobility, strong evidences suggest that TR-GAGs are still active. TR-GAGs represent ubiquitous nonautonomous structures that could be involved in the molecular diversities of plant genomes.

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