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, Qiannan WANG Investigation du mécanisme fonctionnel des gènes AtRING1 et AtZRF1 dans la régulation de la croissance et du développement chez les plantes

, Dans mes travaux de thèse, j'ai caractérisé AtRING1, un sous-unité essentiel du PcG, et AtZRF1, une protéine proposée comme lecteur del'histone H2A monoubiquitinée (H2Aub1) en aval du fonctionnement du PcG. Mes résultats montrent qu'une perte-de-fonction totale de AtRING1A, par 'CRISPR/Cas9 gene-editing', causes une létalité partielle embryonnaire et la dédifférenciation cellulaire de la plantule d'Arabidopsis. Les mutations du domaine RAWUL au C-terminal de AtRING1A sont plus tolérées mais induisent certains défauts sur la croissance végétative, la floraison, l'organogénèse, et la production des graines. Mes analyses moléculaires révèlent que ces mutations du domaine RAWUL réduisent H2Aub1 et augmentent l'expression de plusieurs gènes essentiels dans la régulation du développement de la plante. Ainsi, mes données ont permis à établir une fonction primordiale de AtRING1 et à attribuer un rôle de son domaine RAWUL dans la déposition de H2Aub1 et répression des gènes in vivo, Résumé Chez les plantes comme chez les animaux, les protéines du groupe Polycomb (PcG) jouent des rôles essentiels dans les processus développementaux par la répression de l'expression des gènes

. Mots-clés,

, Chromatine regulateur; Épigénétique; H2Aub1; H3K27me3; Régulation de la transcription

;. Atring1 and . Rawul, My thesis work focused on the characterization of AtRING1A, one of the PcG core subunits, and of AtZRF1, a protein proposed as a reader of the histone H2A-monoubiquitin (H2Aub1) downstream to the PcG function. My results show that a total loss-of-function of AtRING1A, by CRISPR/Cas9 gene editing, leads to partial embryonic lethal and callus-formation of seedlings in Arabidopsis. Several mutations within the RAWUL domain at the C-terminus of AtRING1A are better tolerated and induce several defects in plant vegetative growth, flowering time, floral organ formation and seed production. My molecular data indicate a role of the RAWUL domain in H2Aub1 deposition in vivo and suppression of several key developmental genes. Our characterization of loss-of-function of AtZRF1 provides important detailed information about its function in the regulation of cell division and cell differentiation, AtZRF1 Summary In plants as in animals, the Polycomb Group (PcG) proteins play key roles in diverse developmental processes by repressing the expression of genes

. Rawul;-atzrf1,