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<dc:title xml:lang="en">Diversity of the mechanisms related to viral RNA uridylation in plants</dc:title>
<dcterms:alternative xml:lang="fr">Diversité des mécanismes liés à l’uridylation des ARN viraux chez les plantes</dcterms:alternative>
<dc:subject xml:lang="fr">Phytovirus</dc:subject>
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<dc:subject xml:lang="fr">Uridylation</dc:subject>
<dc:subject xml:lang="fr">TUTases</dc:subject>
<dc:subject xml:lang="fr">3’RACE-seq</dc:subject>
<dc:subject xml:lang="fr">Arabidopsis thaliana</dc:subject>
<dc:subject xml:lang="en">Positive-strand RNA phytovirus</dc:subject>
<dc:subject xml:lang="en">RNA</dc:subject>
<dc:subject xml:lang="en">Uridylation</dc:subject>
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<tef:elementdEntree autoriteExterne="059565349" autoriteSource="Sudoc">ARN -- Modifications posttranscriptionnelles</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les phytovirus sont responsables d’importants dommages sur les cultures. La compréhension des mécanismes liés à l’infection virale est donc cruciale. Ces dernières années, l’uridylation des ARN est apparue comme un acteur clé de la régulation post-transcriptionnelle des ARN cellulaire mais également proposée comme un nouveau mécanisme antiviral chez les métazoaires. Pourtant, les connaissances sur les processus moléculaires impliqués dans l’’uridylation des ARN viraux restent rares, en particulier pour les virus de plantes. Cette étude fournit des informations sur l’uridylation des ARN viraux chez les plantes pour des espèces représentatives des principales familles virales. Nos données révèlent que les ARN de phytovirus présentent des profils d’uridylation variés, ce qui suggère que des mécanismes moléculaires distincts pourraient être à l’oeuvre. Mes résultats montrent l’implication des uridylyltransférases terminales (TUTases) de l’hôte dans l’uridylation des ARN du Turnip mosaic virus and du Turnip crinkle virus, tandis que d’autres facteurs, potentiellement des facteurs viraux, sont responsables du haut niveau de mono-uridylation observé pour les ARN du Grapevine fanleaf virus. Je montre également que l’accumulation du Turnip mosaic virus est réduite lors de la surexpression de HESO1, une uridylyl transférase terminale (TUTase) chez Arabidopsis. Ces travaux ouvrent la voie à une meilleure compréhension des mécanismes moléculaires sous-jacents de l’uridylation des ARN viraux chez les plantes.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Phytoviruses cause significant crop damages worldwide. Therefore, the understanding of the mechanisms related to viral infection is crucial. In the last few years, RNA uridylation emerged as a new potential antiviral defense mechanism in metazoans. Yet, the knowledge of the molecular processes involved in viral RNA uridylation remains scarce, especially for plant viruses. This study provides a global insight on viral RNA uridylation in plants for species representative of the main families of single-stranded RNA phytoviruses. Our data reveal an extreme diversity of uridylation patterns across phytoviral RNAs, suggesting that distinct molecular mechanisms could be in place. In line with this, my results show the involvement of the host terminal uridylyltransferases (TUTases) in theRNA uridylation for the Turnip mosaic virus and Turnip crinkle virus, while other factors, possibly viral factors, are responsible for the high mono-uridylation level observed for the Grapevine fanleaf virus RNAs. Interestingly, I also show that the accumulation of the TuMV is reduced upon the over expression of HESO1, an Arabidopsis TUTase.This work paves the way for the better understanding of the molecular mechanisms underlying viral RNA uridylation in plants.</dcterms:abstract>
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