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Biogénèse des siRNAs endogènes chez Arabidopsis thaliana : étude fonctionnelle de DRB7.2, une nouvelle protéine de fixation à l'ARN double brin et développement d'outils moléculaires pour la caractérisation du mode d'action de DCL4

Abstract : RNA silencing is initiated by double-stranded RNA (dsRNA) molecules that will be processed into various classes of small RNAs (sRNAs), which confer the sequence-specificity of this mechanism. In the model plant Arabidopsis thaliana, dsRNA processing is mediated by four distinct RNaseIII-like enzymes, named DCL1 to DCL4, which can be assisted by dsRNA-binding proteins (DRBs). During my PhD, I was able to characterize in details the function of a new DRB protein, DRB7.2. Our results revealed that this protein regulates the accumulation of a specific class of endogenous sRNAs, the endoIR-siRNAs, by selectively sequestering their dsRNA precursors and inhibiting their cleavage by the DCLs. In parallel, I also developed molecular tools to study the mode of action of the most versatile DCL in plants, DCL4. Detailed characterization of these tools revealed key roles of distinct structural determinants (at the protein or RNA level), implicated in the specificity and cleavage efficiency of the various dsRNA susbtrates by DCL4.
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Submitted on : Thursday, January 11, 2018 - 5:26:55 PM
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  • HAL Id : tel-01681635, version 2

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Thomas Montavon. Biogénèse des siRNAs endogènes chez Arabidopsis thaliana : étude fonctionnelle de DRB7.2, une nouvelle protéine de fixation à l'ARN double brin et développement d'outils moléculaires pour la caractérisation du mode d'action de DCL4. Génomique, Transcriptomique et Protéomique [q-bio.GN]. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAJ002⟩. ⟨tel-01681635v2⟩

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