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<dc:title xml:lang="en">Characterization of the RNA maturation-degradation machinery in plant mitochondria</dc:title>
<dcterms:alternative xml:lang="fr">Caractérisation de la machinerie de maturation-dégradation des ARN chez les mitochondries de plantes</dcterms:alternative>
<dc:subject xml:lang="fr">ARN</dc:subject>
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<dc:subject xml:lang="fr">Dégradation</dc:subject>
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<dc:subject xml:lang="en">Mitochondria</dc:subject>
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<dcterms:abstract xml:lang="fr">Les mitochondries sont le lieu de production de l'énergie des cellules eucaryotes. La mitochondrie possède son propre transcriptome. Ainsi pour générer un transcriptome mature et efficient, tout un ensemble de RNases permettent la maturation et la dégradation de l'ARN. Parmi elles la protéine MNU2 a été caractérisé comme ayant un rôle dans la maturation. Mais elle pourrait également jouer un rôle dans la dégradation. Au cours de mon doctorat, j'ai montré que MNU2 pourrait être un hub pour un degradosome, en interagissant avec la mtPNPase et une polyA polymérase J'ai généré des mutants mnu2, et afin de caractérisé sa fonction j'ai adapté des méthodes de Séquençages nouvelles générations et les appliquer dans des approches de génétiques inverse. Mes recherches ont montré un rôle déterminant de MNU2 dans la définition des extrémités 5' des ARNs mitochondriaux. Il a également permis de mettre en lumière une potentiel voie de dégradation 5'-3'.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Mitochondria are the site of energy production in eukaryotic cells. Mitochondria have their own transcriptome. In order to generate a mature and efficient transcriptome, a whole range of RNases are required for RNA maturation and degradation. Among these, the MNU2 protein has been characterized as having a role in maturation. But it could also play a role in degradation. During my PhD, I showed that MNU2 could be a hub for a degradosome, interacting with mtPNPase and a polyA polymerase. I generated mnu2 mutants, and in order to characterize its function I adapted new generation sequencing methods and applied them in reverse genetics approaches. My research has shown a decisive role for MNU2 in the definition of 5' monoP ends. It has also shed light on a potential 5'-3' degradation pathway.</dcterms:abstract>
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