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Terminal-repeat retrotransposons with GAG domain in plant genomes: a new testimony on the complex world of transposable elements.


ABSTRACT: 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.

SUBMITTER: Chaparro C 

PROVIDER: S-EPMC4350172 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature

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Terminal-repeat retrotransposons with GAG domain in plant genomes: a new testimony on the complex world of transposable elements.

Chaparro Cristian C   Gayraud Thomas T   de Souza Rogerio Fernandes RF   Domingues Douglas Silva DS   Akaffou Sélastique S   Laforga Vanzela Andre Luis AL   Kochko Alexandre de Ad   Rigoreau Michel M   Crouzillat Dominique D   Hamon Serge S   Hamon Perla P   Guyot Romain R  

Genome biology and evolution 20150107 2


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 th  ...[more]

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