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Role of chromatin regulators AtRING1 and AtZRF1 in Arabidopsis growth and development

Abstract : In plants as in animals, the Polycomb Group (PcG) proteins play key roles in diverse developmental processes by repressing the expression of genes. These proteins work in multi-protein complexes, among them the best characterized ones are Polycomb Repressive Complex 1 (PRC1) and PRC2. Although PRC2 was extensively studied in Arabidopsis, it is only recently that components of PRC1 were identified in plants and their function mechanism remains largely elusive. My thesis work focused on the characterization of AtRING1A, one of the PRC1 core subunits, and of AtZRF1, a protein proposed as a reader of the histone H2A-monoubiquitin (H2Aub1) downstream to the PRC1 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.
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Qiannan Wang. Role of chromatin regulators AtRING1 and AtZRF1 in Arabidopsis growth and development. Vegetal Biology. Université de Strasbourg, 2018. English. ⟨NNT : 2018STRAJ129⟩. ⟨tel-02310659⟩

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