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<dc:title xml:lang="fr">De l’initiation de la transcription à la stabilisation de l’ARN messager : étude du phénotype Tbpl2-/- : de l’ovaire à l’échelle subcellulaire lors de la croissance ovocytaire chez la souris</dc:title>
<dcterms:alternative xml:lang="en">From transcription initiation to mRNA stability : study of the Tbpl2-/- phenotype : from the ovary to the subcellular characterization of growing oocytes</dcterms:alternative>
<dc:subject xml:lang="fr">TBPL2</dc:subject>
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<dc:subject xml:lang="en">Maternal transcriptome</dc:subject>
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<dcterms:abstract xml:lang="fr">Dans l’ovocyte en croissance, la synthèse de l’ARNm dépend de TBPL2 et de l’ARN Pol II. La stabilité à long terme du transcriptome dépend des structures sans membrane associées au cytosquelette nommées CytoPlasmic Lattices (CPLs), et du raccourcissement de la queue poly(A). Les ovocytes Tbpl2-/- cessent de croître. Est-ce que l’arrêt de croissance est lié à un défaut de régulation de la stabilité des transcrits? J’ai montré que l’expression et la localisation des sous-unités du contrôle de la stabilité du transcriptome sont impactées dans le mutant Tbpl2-/-. Les analyses histologiques et subcellulaires révèlent des défauts cytoplasmiques, l’élargissement de foci nucléaires poly(A) et l’absence de formation de CPLs. Ensemble, mes données remettent dans le contexte l’importance fonctionnelle de la croissance ovocytaire pour la mise en place et la régulation de la stabilité du transcriptome maternel.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In oocytes, mRNA synthesis is regulated by the TBPL2/ RNA Pol II machinery. Transcriptome long-term stability relies on membrane-less structures associated with the cytoskeleton termed CytoPlasmic Lattices (CPLs) and on poly(A) shortening. Tbpl2-/- oocytes stop growing. Could this growth arrest be linked to defects in transcript stability control? My research shows that the mRNA-associated stability proteins are indeed expressed during oocyte growth and that their expression and localization are altered in the Tbpl2 mutant. Histological and subcellular analyses show cytoplasmic anomalies and expanded nuclear foci where poly(A) accumulates. Electron microscopy of the Tbpl2 mutant highlights mitochondrial and golgi clustering near the nucleus and a complete absence of CPLs formation. These findings emphasize the critical role of oocyte growth in regulating maternal transcriptome stability.</dcterms:abstract>
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