Integrative profiling of alternative splicing induced by U2AF1 S34F mutation in lung adenocarcinoma reveals a mechanistic link to mitotic stress

Suyeon Kim, Charny Park, Yukyung Jun, Sanghyuk Lee, Yeonjoo Jung, Jaesang Kim

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Mutations in spliceosome components have been implicated in carcinogenesis of various types of cancer. One of the most frequently found is U2AF1 S34F missense mutation. Functional analyses of this mutation have been largely limited to hematological malignancies although the mutation is also frequently seen in other cancer types including lung adenocarcinoma (LUAD). We examined the impact of knockdown (KD) of wild type (wt) U2AF1 and ectopic expression of two splice variant S34F mutant proteins in terms of alternative splicing (AS) pattern and cell cycle progression in A549 lung cancer cells. We demonstrate that induction of distinct AS events and disruption of mitosis at distinct sub-stages result from KD and ectopic expression of the mutant proteins. Importantly, when compared with the splicing pattern seen in LUAD patients with U2AF1 S34F mutation, ectopic expression of S34F mutants but not KD was shown to result in common AS events in several genes involved in cell cycle progression. Our study thus points to an active role of U2AF1 S34F mutant protein in inducing cell cycle dysregulation and mitotic stress. In addition, alternatively spliced genes which we describe here may represent novel potential markers of lung cancer development.

Original languageEnglish
Pages (from-to)733-741
Number of pages9
JournalMolecules and Cells
Volume41
Issue number8
DOIs
StatePublished - 2018

Bibliographical note

Funding Information:
This research was supported by funding from the Ministry of Science and ICT via National Research Foundation, Republic of Korea (NRF-2013M3C7A1056562 to J. Kim; NRF-2015 K1A4A3047851 to S. Lee; NRF-2016R1A6A3A11932702 to Y. Jung).

Funding Information:
This research was supported by funding from the Ministry of Science and ICT via National Research Foundation, Republic of Korea (NRF-2013M3C7A1056562 to J. Kim; NRF-2015 K1A4A3047851 to S. Lee; NRF-2016R1A6A3A11932702 to

Publisher Copyright:
© The Korean Society for Molecular and Cellular Biology. All rights reserved.

Keywords

  • Alternative splicing
  • Lung adenocarcinoma
  • Mitotic stress
  • S34F
  • U2AF1

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