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Visualizing nuclear-localized RNA using transient expression system in plants.
Genes to Cells : Devoted to Molecular & Cellular Mechanisms 2018 Februrary
By modifying the existing cytosolic RNA visualization tool pioneered by Schönberger, Hammes, and Dresselhaus (2012), we developed a method to visualize nuclear-localized RNA. Our method uses (i) an RNA component that consists of an RNA of interest that is fused to a bacteriophage-derived MS2 sequence; and (ii) GFP fused to MS2 coat protein (MSCP), which binds specifically to MS2 as is also the case in the method for cytosolic RNA visualization. The nuclear localization sequence (NLS) at the C-terminal of MSCP-GFP tethers the probe to the nucleus. To reduce background signals in the nucleus, we replaced the NLS with a nuclear export sequence (NES) that anchors the MSCP-GFP probe in the cytosol. Our nuclear RNA visualization method differs from previous methods in two aspects: (i) We used an NES to reduce nuclear background signal so that the MSCP-GFP probe localizes in the cytosol by default; (ii) We added mCherry as a visual marker in the RNA component to increase its efficient usage in a transient system.
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