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<dc:title xml:lang="fr">Compréhension de la neurophysiopathologie de l'ataxie de Friedreich et développement d'une approche de thérapie génique dans un nouveau modèle murin</dc:title>
<dcterms:alternative xml:lang="en">Understanding Friedreich’s ataxia neuropathophysiology and development of a gene therapy approach using a new mouse model</dcterms:alternative>
<dc:subject xml:lang="fr">Ataxie de Friedreich</dc:subject>
<dc:subject xml:lang="fr">Neurophysiopathologie</dc:subject>
<dc:subject xml:lang="fr">Neurones proprioceptifs</dc:subject>
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<dc:subject xml:lang="en">Proprioceptive neurons</dc:subject>
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<dcterms:abstract xml:lang="fr">L’ataxie de Friedreich (AF) est une maladie mitochondriale caractérisée par une ataxie sensitive et spinocérébelleuse, une cardiomyopathie et du diabète, pour laquelle il n’existe pas de traitement. L’AF résulte de niveaux réduits de frataxine (FXN), une protéine mitochondriale impliquée dans la biosynthèse des centres Fe-S. La neurophysiopathologie précise de la maladie n’est pas identifiée et malgré d’intenses progrès ces dernières années, il n’existait pas de bon modèle pour développer des approches thérapeutiques visant à stopper ou réverser l’atteinte sensitive de l’AF. Nous avons donc généré un nouveau modèle murin qui récapitule l’ataxie sensitive et la neuropathie associée au déficit en FXN. Plusieurs mécanismes moléculaires affectés en absence de FXN dans les neurones proprioceptifs, primairement affectés dans l’AF, ont été identifiés. Nous avons également démontré l’efficacité d’une approche de thérapie génique, basée sur l’utilisation de vecteur adéno-associés (AAV) exprimant la FXN humaine, pour réverser la neuropathie, établissant la preuve de concept du potentiel d’une telle approche pour l’atteinte sensitive de l’AF.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Friedreich ataxia (FA) is a rare mitochondrial disease characterized by sensory and spinocerebellar ataxia, hypertrophic cardiomyopathy, and diabetes, for which there is no treatment. FA is caused by reduced levels of frataxin (FXN), an essential mitochondrial protein involved in the biosynthesis of Fe-S clusters. To date, FA precise neuropathophysiology is not identified and despite significant progresses in recent the years, there was no good model to develop therapeutic approaches in order to stop or reverse the sensory ataxia associated to the FA. Thus, we have generated a new neuronal mouse model that recapitulates the sensory ataxia and the neuropathy associated to FXN deficiency. Several molecular mechanisms dysregulated in the absence of FXN in the proprioceptive neurons, primarily affected in FA, were identified. Furthermore, we have demonstrated the efficacy of a gene therapy (GT) approach, based on the delivery of adeno-associated vectors (AAV) expressing the human FXN, to reverse the sensitive neuropathy, thus establishing the preclinical proof of concept for the potential of GT in treating FA sensitive neuropathy.</dcterms:abstract>
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