4.8 Article

Functional significance of U2AF1 S34F mutations in lung adenocarcinomas

Journal

NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -

Publisher

NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-13392-y

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Funding

  1. National Cancer Institute [R01CA188298]
  2. US National Institutes of Health Director's New Innovator Award Program [1-DP2-CA186569]
  3. Ludwig Institute for Cancer Research
  4. CRK Faculty Scholar Fund
  5. NIH [R25-CA180993, T32-CA 121940, R35-CA209919]
  6. NIH F32 Cancer Biology Training Grant
  7. MAC3 Fellowship

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The functional role of U2AF1 mutations in lung adenocarcinomas (LUADs) remains incompletely understood. Here, we report a significant co-occurrence of U2AF1 S34F mutations with ROS1 translocations in LUADs. To characterize this interaction, we profiled effects of S34F on the transcriptome-wide distribution of RNA binding and alternative splicing in cells harboring the ROS1 translocation. Compared to its wild-type counterpart, U2AF1 S34F preferentially binds and modulates splicing of introns containing CAG trinucleotides at their 3' splice junctions. The presence of S34F caused a shift in cross-linking at 3' splice sites, which was significantly associated with alternative splicing of skipped exons. U2AF1 S34F induced expression of genes involved in the epithelial-mesenchymal transition (EMT) and increased tumor cell invasion. Finally, S34F increased splicing of the long over the short SLC34A2-ROS1 isoform, which was also associated with enhanced invasiveness. Taken together, our results suggest a mechanistic interaction between mutant U2AF1 and ROS1 in LUAD.

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