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Learn MoreMany cellular RNAs localize to specific subcellular compartments. Currently, methods to systematically study subcellular RNA localization are limited and lagging behind proteomic approaches. Here, we combined APEX2-mediated proximity biotinylation of proteins with PAR-CLIP to simultaneously profile the proteome and the transcriptome bound by RNA binding proteins in any given subcellular compartment. Our approach is fractionation-independent and does not rely on additional RNA manipulation and labeling steps, thus making it easy to apply. Furthermore, it enables to study the locali-zation of RNA processing intermediates, as well as the identification of regulatory RNA cis-acting elements occupied in different cellular compartments. In a proof-of-concept study we studied RNA and protein localization in the nucleus, cytoplasm and at cell-cell interfaces using Proximity-CLIP. These experiments revealed among other in-sights frequent transcriptional readthrough continuing for several kilobases down-stream of the canonical cleavage and polyadenylation site, a differential binding pat-tern of nuclear and cytoplasmic mRNAs, as well as the localization of mRNAs contain-ing 3UTR CUG sequence elements at cell-cell interfaces, of which many encode regulatory proteins. SOURCE: Markus Hafner (markus.hafner@nih.gov) - Laboratory of Muscle Stem Cells and Gene Regulation National Institutes of Health
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