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<dc:title xml:lang="en">The basic transcriptional machinery in intestinal homeostasis</dc:title>
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<dc:subject xml:lang="fr">Développement</dc:subject>
<dc:subject xml:lang="fr">Homéostasie</dc:subject>
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<dcterms:abstract xml:lang="fr">Les facteurs de transcription interagissent avec la machinerie transcriptionnelle de base initiant la transcription des gènes. Contrairement à ces facteurs, la machinerie transcriptionnelle de base est peu étudiée dans des contextes tissulaires spécifiques. L’épithélium intestinal est un tissu complexe, interface entre la lumière intestinale et l’organisme, jouant un rôle de digestion, barrière et transport des nutriments. Durant ma thèse, j’ai étudié le rôle cette machinerie transcriptionnelle de base dans l’homéostasie intestinale, me focalisant sur l’un de ses composants majeurs, la protéine TAF4 « TATA-box binding protein Associated Factor 4 ». A l’aide de modèles murins et d’organoïdes d’invalidation de Taf4, j’ai pu mettre en lumière son rôle dans l’homéostasie intestinale embryonnaire et adulte. Son action s’exerce sur les cellules souches et différenciées, s’opposant aux complexes polycomb, impliqués dans la régulation négative des gènes en modifiant la structure chromatinienne.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Regulatory transcription factors interact with the basic transcriptional machinery to initiate genetranscription. In contrast to regulatory factors, the basic transcriptional machinery has been little studied in specific tissue contexts, including the intestine. The intestinal epithelium is a complex tissue at the interface between the intestinal lumen and the body, playing a key role in digestion, barrier, and nutrient transport. During my thesis, I studied the role of the basic transcriptional machinery in intestinal homeostasis, focusing on one of its major components, the TAF4 protein (TATA-box binding protein Associated Factor 4). Using mouse models and intestinal organoids of Taf4 invalidation, I was able to highlight its role in the homeostasis of the intestine at the embryonic and adult stages. Its action is exerted on stem cells and differentiated cells, in particular by opposing polycomb complexes, involved in the negative regulation of genes by modifying the chromatin structure.</dcterms:abstract>
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