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<dc:title xml:lang="fr">Développement d'un nouveau modèle cellulaire de l'ataxie de Friedreich : différenciation de cellules pluripotentes induites de patients en cardiomyocytes</dc:title>
<dcterms:alternative xml:lang="en">Induced pluripotent stem cells-derived cardiomyocytes : a new model for Friedreich’s ataxia</dcterms:alternative>
<dc:subject xml:lang="fr">Ataxie de Friedreich</dc:subject>
<dc:subject xml:lang="fr">Cardiomyocytes</dc:subject>
<dc:subject xml:lang="fr">Cellules pluripotentes induites</dc:subject>
<dc:subject xml:lang="fr">Différenciation</dc:subject>
<dc:subject xml:lang="fr">Mitochondrie</dc:subject>
<dc:subject xml:lang="fr">Frataxine</dc:subject>
<dc:subject xml:lang="en">Friedreich’s ataxia</dc:subject>
<dc:subject xml:lang="en">Cardiomyocytes</dc:subject>
<dc:subject xml:lang="en">Induced pluripotent stem cells</dc:subject>
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<dcterms:abstract xml:lang="fr">L’ataxie de Friedreich (AF) est une maladie neurodégénérative récessive due à un déficit en frataxine, une protéine mitochondriale très conservée. Elle est souvent associée à une atteinte cardiaque. Le déficit en frataxine est responsable d’une diminution de l’activité des enzymes Fe-Set d’une accumulation mitochondriale de fer. Les cellules pluripotentes induites (iPS) générées par reprogrammation de cellules somatiques constituent un outil puissant pour le développement de modèles de maladies monogéniques. Les cardiomyocytes obtenus par différenciation des iPS de patients AF développent une atteinte mitochondriale après 1 mois en culture. Celle-ci se complète par l’apparition secondaire de dépôts de fer, visibles après 4 mois en culture, indiquant une progression dans la physiopathologie de la maladie. Notre étude montre la capacité de ces cardiomyocytes à modéliser le phénotype cardiaque de l’AF, offrant ainsi l’opportunité d’approfondir leur caractérisation physiopathologique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Friedreich’s ataxia (FA) is a recessive neurodegenerative disorder due to a deficit of frataxin, a highly conserved mitochondrial protein. It is commonly associated with a hypertrophic cardiomyopathy. The main pathophysiological consequences are a decrease of Fe-S enzyme activities and mitochondrial iron accumulation. The recent technical advances in the generation of induced pluripotent stem cells (iPS) from somatic cells provide a powerful tool to create disease specific cellular models. Cardiomyocytes derived from FA-iPS present altered mitochondria after 1 month in culture. After four months in culture, iron deposits can be found in degenerating mitochondria, indicating a progression in the pathophysiology of the disease. Our study illustrates the ability of iPS-derived cardiomyocytes to model the cardiac phenotype associated with FA, and offers new opportunities to further investigate pathological mechanisms linked to frataxin deficiency.</dcterms:abstract>
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