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<dc:title xml:lang="en">Study of Hippo effectors, Yap1 et Wwrt1, during proepicardium formation</dc:title>
<dcterms:alternative xml:lang="fr">Étude des effecteurs de la voie Hippo, Yap1 et Wwrt1, pendant la formation du proépicarde</dcterms:alternative>
<dc:subject xml:lang="fr">Poisson zèbre</dc:subject>
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<dc:subject xml:lang="fr">Développement</dc:subject>
<dc:subject xml:lang="fr">Épicarde</dc:subject>
<dc:subject xml:lang="fr">Proepicarde</dc:subject>
<dc:subject xml:lang="en">Zebrafish</dc:subject>
<dc:subject xml:lang="en">Heart</dc:subject>
<dc:subject xml:lang="en">Development</dc:subject>
<dc:subject xml:lang="en">Epicardium</dc:subject>
<dc:subject xml:lang="en">Proepicardium</dc:subject>
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<dcterms:abstract xml:lang="fr">L'épicarde est une couche de cellules mésothéliales recouvrant le myocarde. L’épicarde est essentiel pour le développement cardiaque, car il favorise la croissance myocardique, la formation de la vascularisation coronaire et la génération de fibroblastes intracardiaques. Chez le poisson zèbre, les progéniteurs épicardiques proviennent du péricarde dorsal. Lors du développement des progéniteurs épicardiques certaines cellules du péricarde dorsal s’arrondissent et font saillie pour former le cluster proépicardique (PE). Yap1 et Wwrt1 sont des protéines essentielles de la voie Hippo qui sont exprimées dans l'épicarde en développement chez la souris. Bien que l'activité Yap1 / Wwrt1 soit impliquée dans le développement cardiaque chez le poisson zèbre, son impact pendant la formation du PE reste inexploré. Nous avons caractérisé une lignée rapportant l’activité transcriptionelle de Yap1 / Wwrt1-Tead lors de la formation du PE. Ensuite, nous avons évalué le rôle de Yap1 / Wwr1- Tead lors de la formation du PE en modifiant l'activité Yap1 / Wwrt1-Tead. Nous avons également étudié le développement de PE en réponse aux forces mécaniques. Enfin, nous avons également recherché un nouveau régulateur de la formation de cluster PE. Nos travaux suggèrent que Yap1 / Wwrt1 est nécessaire pour la formation du cluster PE bien que les mutants yap1 ne présentent aucun phénotype PE. Nos travaux suggèrent également que les forces mécaniques sont essentielles pour moduler la localisation PE lors de sa formation dans la cavité péricardique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The epicardium, a mesothelial cell layer covering the myocardium, is essential for heart development, as it promotes myocardial growth, coronary vasculature formation and intracardiac fibroblast generation. In zebrafish, epicardial progenitors arise from the dorsal pericardium (DP). Some DP cells round up and protrude forming the proepicardial (PE) cluster. Yap1 and Wwrt1, central nodes of the Hippo pathway, are localized in the developing epicardium in mice. Although Yap1/Wwrt1-Tead activity is involved in cardiac development in zebrafish, its impact during PE cluster formation remains elusive. We characterized Yap1/Wwrt1-Tead reporter line during PE cluster formation. Next, we assessed the role of Yap1/Wwrt1-Tead activity in this process modifying it. We further studied PE cluster development and how it is affected by changes in mechanical forces. Finally, we searched as well for new regulators of PE cluster formation. Our work suggests that Yap1/Taz-Tead activity is involved during PE cluster formation although Yap1 mutants do no present any PE phenotype. Our work also suggests that fluid forces are key to modulate PE localisation and formation in the pericardial cavity.</dcterms:abstract>
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