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Learn MoreThe nuclear export pathway transports long RNAs produced in the nucleus to the cytoplasm. The core components of this pathway are thought to be required for export of virtually all polyadenylated RNAs. Here, we depleted different proteins that act in nuclear export in human cells, and quantified the transcriptome-wide consequences on RNA localization. Different genes exhibited substantially variable sensitivities, with depletion of NXF1 and TREX components causing some transcripts to become strongly retained in the nucleus while others were not affected. Specifically, NXF1 is preferentially required for export of single- or few-exon transcripts with long exons or high A/U-content, whereas depletion of TREX complex components preferentially affects spliced and G/C-rich transcripts. Using massively parallel reporter assays we identified short sequence elements that render transcripts dependent on NXF1 for their export, and identified synergistic effects of splicing and NXF1. These results revise the current model of how nuclear export shapes the distribution of RNA within human cells. SOURCE: Igor Ulitsky (igor.ulitsky@weizmann.ac.il) - Weizmann Institute of Science
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