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• W2947921650 abstract "Abstract Drought episodes decrease plant growth and productivity, which in turn cause high economic losses. Plants naturally sense and respond to water stress by activating specific signalling pathways leading to physiological and developmental adaptations. Genetically engineering genes that belong to these pathways might improve the drought tolerance of plants. The abscisic acid (ABA)-responsive element binding protein 1/ABRE binding factor (AREB1/ABF2) is a key positive regulator of the drought stress response. We investigated whether the CRISPR activation (CRISPRa) system that targets AREB1 might contribute to improve drought stress tolerance in Arabidopsis. Arabidopsis histone acetyltransferase 1 (AtHAT1) promotes gene expression activation by switching chromatin to a relaxed state. Stable transgenic plants expressing chimeric dCas9 HAT were first generated. Then, we showed that the CRISPRa dCas9 HAT mechanism increased the promoter activity controlling the β-glucuronidase ( GUS ) reporter gene. To activate the endogenous promoter of AREB1 , the CRISPRa dCas9 HAT system was set up, and resultant plants showed a dwarf phenotype. Our qRT-PCR experiments indicated that both AREB1 and RD29A , a gene positively regulated by AREB1, exhibited higher gene expression than the control plants. The plants generated here showed higher chlorophyll content and faster stomatal aperture under water deficit, in addition to a better survival rate after drought stress. Altogether, we report that CRISPRa dCas9 HAT is a valuable biotechnological tool to improve drought stress tolerance through the positive regulation of AREB1." @default.
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• W2947921650 date "2019-05-30" @default.
• W2947921650 modified "2023-10-18" @default.
• W2947921650 title "Improved drought stress tolerance in Arabidopsis by CRISPR/dCas9 fusion with a Histone AcetylTransferase" @default.
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• W2947921650 doi "https://doi.org/10.1038/s41598-019-44571-y" @default.
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