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<dc:title xml:lang="fr">PARP3 promotes myogenic differentiation and skeletal muscle function in cooperation with the histone methyltransferase EZH2</dc:title>
<dcterms:alternative xml:lang="en">PARP3 favorise la différenciation myogénique et la fonction du muscle squelettique en coopération avec l’histone méthyltransférase EZH2</dcterms:alternative>
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<dc:subject xml:lang="fr">Myogenèse</dc:subject>
<dc:subject xml:lang="fr">Muscle squelettique</dc:subject>
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<dc:subject xml:lang="fr">Régénération musculaire</dc:subject>
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<dc:subject xml:lang="en">Myogenesis</dc:subject>
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<dcterms:abstract xml:lang="fr">Ce travail de thèse identifie un rôle de PARP3 dans la myogenèse et la fonction du muscle squelettique murin. In vitro, la disruption de Parp3 (Crispr/ncas9) dans les cellules souches musculaires squelettiques C2C12 altère leur différenciation en myotubes et l’expression de gènes impliqués dans la fonction musculaire (transcriptomique). Une étude mécanistique (ChIP-qPCR) révèle la régulation de l’activité catalytique d’EZH2 par PARP3 dans la régulation transcriptionnelle de gènes muscle-spécifiques. In vivo, l’étude histologique du Tibialis anterior (TA) chez les souris Parp3KO (3 mois) révèlent la présence de noyaux centraux nucléaires associés à une faiblesse musculaire (tests d’agrippement). L’étude de la composition en fibres musculaires révèle la répression transcriptionnelle de Myh2 (fibre IIA) dans les muscles Parp3KO, confirmée par une baisse significative des fibres IIA (immunohistochimie). Des expériences de régénération musculaire révèlent l’induction de l’expression transcriptionnelle de gènes impliqués précocement lors de la régénération chez les souris naïves Parp3KO, suggérant un phénotype de régénération continuel du TA.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis work identifies a role for PARP3 in myogenesis and skeletal muscle function in mice. In vitro, the disruption of Parp3 (Crispr/Cas9) in C2C12 skeletal muscle stem cells alters their differentiation into myotubes and the expression of genes involved in muscle function (transcriptomics). A mechanistic study (ChIP-qPCR) reveals the regulation of the catalytic activity of EZH2 by PARP3 in the transcriptional regulation of muscle-specific genes. In vivo, histological examination of the Tibialis anterior (TA) in Parp3KO mice (3 months) reveals the presence of centrally nucleated myofibers associated with muscle weakness (grip strength tests). Analysis of muscle fiber composition reveals transcriptional repression of Myh2 (type IIA fiber) in Parp3KO muscles, confirmed by a significant decrease in IIA fibers (immunohistochemistry). Muscle regeneration experiments reveal the induction of transcriptional expression of genes involved early in regeneration in naive Parp3KO mice, suggesting a continuous regeneration phenotype in the TA.</dcterms:abstract>
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