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<dc:title xml:lang="fr">Implication du gène Dicer1 dans le vieillissement et ses pathologies chez la souris</dc:title>
<dcterms:alternative xml:lang="en">Implication of Dicer1 gene in ageing and age-related pathologies in mice</dcterms:alternative>
<dc:subject xml:lang="fr">Dicer1</dc:subject>
<dc:subject xml:lang="fr">Modèle souris</dc:subject>
<dc:subject xml:lang="fr">Vieillissement prématuré</dc:subject>
<dc:subject xml:lang="fr">Tissu adipeux</dc:subject>
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<tef:elementdEntree autoriteExterne="02731359X" autoriteSource="Sudoc">Maladies héréditaires métaboliques</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Malgré un gain d’espérance de vie de 30 ans au cours du siècle dernier dans les pays développés, atteindre un âge avancé reste associé au développement de pathologies chroniques et/ou invalidantes. Définir les acteurs de vieillissement est donc une priorité pour espérer freiner l’établissement de ces maladies et/ou réduire leur sévérité. L’enzyme DICER possède des fonctions essentielles au maintien de l’homéostasie cellulaire mais son rôle dans le vieillissement reste encore à définir. Afin d’évaluer sa contribution, le suivi longitudinal de souris Dicer1d/d avec une expression réduite de la protéine a été réalisé. Les animaux Dicer1d/d ont une survie réduite et un développement précoce de pathologies liées à l’âge. Le séquençage ARN du tissu adipeux révèle une profonde altération du transcriptome chez les mutants avec l’âge. Nous suggérons que cette signature transcriptomique différencielle soit à l’origine du vieillissement prématuré. Les données établissent Dicer1 comme un acteur clé de la balance altération/réparation conditionnant la vitesse de vieillissement et posent les animaux dicer1d/d comme un nouveau modèle d’étude de ce processus.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Despite a 30-year gain in life expectancy over the last century in developed countries, reaching old age remains associated with the development of chronic and/or disabling pathologies. Defining the actors of aging is therefore a priority in order to delay the establishment of these diseases and/or reduce their severity. DICER is an enzyme with essential functions in the maintenance of cellular homeostasis but its role in aging remains to be defined. In order to address its contribution, longitudinal monitoring of Dicer1d/d mice, with reduced expression of the protein, was carried out. Dicer1d/d animals have reduced survival and early development of age-related pathologies. RNA sequencing of adipose tissue shows a profound alteration of the transcriptome in aged mutants. We suggest that this differential transcriptomic signature is responsible for the premature aging observed in Dicer1 mutants. My thesis work established Dicer1 as a key player in the alteration/repair balance conditioning the rate of aging and revealed Dicer1d/d animals as a new mouse model for age-related studies.</dcterms:abstract>
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