Oncogenic splicing factor SRSF3 regulates ILF3 alternative splicing to promote cancer cell proliferation and transformation

RNA
Rong JiaZhi-Ming Zheng

Abstract

Alternative RNA splicing is an important focus in molecular and clinical oncology. We report here that SRSF3 regulates alternative RNA splicing of interleukin enhancer binding factor 3 (ILF3) and production of this double-strand RNA-binding protein. An increased coexpression of ILF3 isoforms and SRSF3 was found in various types of cancers. ILF3 isoform-1 and isoform-2 promote cell proliferation and transformation. Tumor cells with reduced SRSF3 expression produce aberrant isoform-5 and -7 of ILF3. By binding to RNA sequence motifs, SRSF3 regulates the production of various ILF3 isoforms by exclusion/inclusion of ILF3 exon 18 or by selection of an alternative 3' splice site within exon 18. ILF3 isoform-5 and isoform-7 suppress tumor cell proliferation and the isoform-7 induces cell apoptosis. Our data indicate that ILF3 isoform-1 and isoform-2 are two critical factors for cell proliferation and transformation. The increased SRSF3 expression in cancer cells plays an important role in maintaining the steady status of ILF3 isoform-1 and isoform-2.

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Citations

Jun 1, 2019·Cell & Bioscience·Zhi-Ming Zheng
Jul 1, 2020·Frontiers in Cell and Developmental Biology·Andrea CerasuoloMaria Lina Tornesello
Nov 4, 2020·Brain : a Journal of Neurology·Antonio C Fuentes-FayosRaúl M Luque
Apr 17, 2021·The FEBS Journal·Subhayan Sur, Ratna B Ray
Jun 10, 2021·The American Journal of Surgical Pathology·Megan J FitzpatrickValentina Nardi
Jun 15, 2021·Pathology, Research and Practice·Han Wang, Yanxia Jiang

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