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<dc:title xml:lang="en">RNA/RNA interactions involved in the regulation of Benyviridae viral cicle</dc:title>
<dcterms:alternative xml:lang="fr">Interactions ARN/ARN impliquées dans la régulation du cycle viral des Benyviridae</dcterms:alternative>
<dc:subject xml:lang="fr">Phytovirus</dc:subject>
<dc:subject xml:lang="fr">Génome ségmenté</dc:subject>
<dc:subject xml:lang="fr">Intégrité génomique</dc:subject>
<dc:subject xml:lang="fr">Formule virale</dc:subject>
<dc:subject xml:lang="fr">Mouvement viral à longue distance</dc:subject>
<dc:subject xml:lang="fr">Interaction ARN/ARN</dc:subject>
<dc:subject xml:lang="en">Phytovirus</dc:subject>
<dc:subject xml:lang="en">Segmented genome</dc:subject>
<dc:subject xml:lang="en">Genome integrity</dc:subject>
<dc:subject xml:lang="en">Genome formula</dc:subject>
<dc:subject xml:lang="en">Systemic movement</dc:subject>
<dc:subject xml:lang="en">RNA/RNA interaction</dc:subject>
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<tef:elementdEntree autoriteExterne="027221113" autoriteSource="Sudoc">Betterave à sucre</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031445411" autoriteSource="Sudoc">ARN -- Réplication</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Pour préserver l’intégrité de leur génome, les virus multipartite à ARN nécessitent une forte multiplicité d’infection qui représente un coût biologique inapproprié en terme de réplication virale. Dans cette étude, un réseau d’interaction entre ARN génomiques (ARNg), constitué d’au moins un type de chaque ARNg est proposé. Un tel réseau permet de réduire les coûts biologiques liés à la réplication en assurant une reconnaissance intermoléculaire et une mobilisation d’un complexe RNP modulaire maintenant l’intégrité du génome. Un tel complexe est considéré comme l’unité infectieuse mobile assurant la dissémination du virus dans la plante entière. Le but de cette thèse a été de démontrer l’existence d’interactions entre les ARNg du beet necrotic yellow vein virus (BNYVV) et de déterminer l’incidence de ces interactions sur le cycle viral. Une formule génomique a été déterminée pour différentes plantes et tissus. Les ARNg ont tous été co-détectés dans des cellules isolées issues de tissus infectés. Un domaine d’interaction entre l’ARN1 et 2 a été identifié in vitro et in silico puis évaluée in vivo par des approches de mutagenèse et de complémentation.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Multipartite RNA virus condition to provide a complete set of genomic segments in each infected cell implies a high level of MOI that results in an unsustainable biological cost in terms of viral replication. In the proposed model, to minimize the cost of the genome integrity preservation, a network of RNA/RNA interactions determines the recognition and the mobilization of at least one of each genomic RNAs in a modular RNP complex. Such complex must be considered as the mobile infectious unit of the segmented genome during viral spread in the plant. The Aim of this thesis was to experimentally determine the existence of RNA/RNA interactions between BNYVV RNAs and their implication in the viral cycle. BNYVV genomic segments have been co-detected within isolated single cells from systemic tissues where they accumulate to reach set point genome formulas. In the model where vRNAs interact each other to form the minimal mobile infective unit, RNA1 and RNA2 interaction domain has been identified in silico and in vitro. The rationale of such an interaction has been provided in vivo using BNYVV and Beet soil-borne mosaic virus chimeras.</dcterms:abstract>
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