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<dc:title xml:lang="en">Retinal ciliopathies in Huntington's and SCA7 disorders</dc:title>
<dcterms:alternative xml:lang="fr">Ciliopathies rétiniennes dans la maladie d'Huntington et l'ataxie spinocérébélleuse type7 (SCA7)</dcterms:alternative>
<dc:subject xml:lang="fr">Maladie d’Huntington</dc:subject>
<dc:subject xml:lang="fr">Ataxie spinocérébélleuse 7</dc:subject>
<dc:subject xml:lang="fr">Rétine</dc:subject>
<dc:subject xml:lang="fr">Neurogenèse</dc:subject>
<dc:subject xml:lang="fr">Cervelet</dc:subject>
<dc:subject xml:lang="fr">Ciliopathies</dc:subject>
<dc:subject xml:lang="en">Huntington’s disease</dc:subject>
<dc:subject xml:lang="en">Spinocerebellar ataxia 7</dc:subject>
<dc:subject xml:lang="en">Retina</dc:subject>
<dc:subject xml:lang="en">Neurogenesis</dc:subject>
<dc:subject xml:lang="en">Cerebellum</dc:subject>
<dc:subject xml:lang="en">Ciliopathies</dc:subject>
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<tef:elementdEntree autoriteExterne="027653579" autoriteSource="Sudoc">Dégénérescence rétinienne</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="040782670" autoriteSource="Sudoc.FMesh">Dégénérescences spinocérébelleuses</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les maladies à polyglutamines (polyQ) sont des maladies neurodégénératives héréditaires dominantes causées par une expansion de CAG traduite en longue expansion de polyglutamine dans la protéine correspondante. Ces maladies comprennent l’ataxie spinocérébélleuse 7 (SCA7) et la maladie de Huntington (MH) causées par une expansion de polyQ dans les protéines ataxine-7 (ATXN7) et huntingtine (htt), respectivement. Les souris SCA7 et MH développent des rétinopathies similaires suggérant des pathomécanismes communs toujours inexpliqués. Durant ma thèse, j’ai trouvé qu’en réponse à la toxicité des polyQ, les photorécépteurs (PR) perdent leur différenciation alors que d’autres migrent ou meurent. De plus, cette mortalité cellulaire active la prolifération des cellules gliales de Müller et leur différenciation en PR. Récemment, j’ai trouvé que l’ATXN7 et la htt se trouvent dans le cil primaire et leur mutation mène à une perte des protéines endogènes des cils associée à des défauts du cil.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Polyglutamine (polyQ) disorders are dominantly inherited neurodegenerative disorders caused by the expansion of CAG repeats translated into long polyQ tracts in the corresponding proteins. These diseases include Spinocerebellar ataxia 7(SCA7) and Huntington’s Disease (HD), caused by polyQ expansion ataxin-7 (ATXN7) and huntingtin (htt), respectively. SCA7 and HD mouse models develop similar retinopathies suggesting common pathomechanisms. In my thesis, I found that, in response to polyQ toxicity, SCA7 photoreceptors (PR) undergo several cell fates ranging from their deconstruction, to their migration and their death. Moreover, this cell death activates the proliferation of Müller glial cells and their differentiation into PR like cells. The pathomechanisms underlying HD and SCA7 are still unknown. Recently, I found that ATXN7 and htt are localized to the PR cilia and that the mutant proteins lead to a progressive loss of the wild-type proteins that correlates with defects in the PR cilia.</dcterms:abstract>
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