Recurrent SRSF2 mutations in MDS affect both splicing and NMD

Rahman, M. A., Lin, K. T., Bradley, R. K., Abdel-Wahab, O., Krainer, A. R. (March 2020) Recurrent SRSF2 mutations in MDS affect both splicing and NMD. Genes Dev, 34 (5-6). pp. 413-427. ISSN 0890-9369

URL: https://www.ncbi.nlm.nih.gov/pubmed/32001512
DOI: 10.1101/gad.332270.119

Abstract

Oncogenic mutations in the RNA splicing factors SRSF2, SF3B1, and U2AF1 are the most frequent class of mutations in myelodysplastic syndromes and are also common in clonal hematopoiesis, acute myeloid leukemia, chronic lymphocytic leukemia, and a variety of solid tumors. They cause genome-wide splicing alterations that affect important regulators of hematopoiesis. Several mRNA isoforms promoted by the various splicing factor mutants comprise a premature termination codon (PTC) and are therefore potential targets of nonsense-mediated mRNA decay (NMD). In light of the mechanistic relationship between splicing and NMD, we sought evidence for a specific role of mutant SRSF2 in NMD. We show that SRSF2 Pro95 hot spot mutations elicit enhanced mRNA decay, which is dependent on sequence-specific RNA binding and splicing. SRSF2 mutants enhance the deposition of exon junction complexes (EJCs) downstream from the PTC through RNA-mediated molecular interactions. This architecture then favors the association of key NMD factors to elicit mRNA decay. Gene-specific blocking of EJC deposition by antisense oligonucleotides circumvents aberrant NMD promoted by mutant SRSF2, restoring the expression of PTC-containing transcript. Our study uncovered critical effects of SRSF2 mutants in hematologic malignancies, reflecting the regulation at multiple levels of RNA metabolism, from splicing to decay.

Item Type: Paper
Subjects: diseases & disorders > cancer > cancer types > leukemia
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > mRNA
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > mutations
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > RNA splicing
CSHL Authors:
Communities: CSHL labs > Krainer lab
Depositing User: Adrian Gomez
Date: 1 March 2020
Date Deposited: 05 Feb 2020 19:05
Last Modified: 27 Apr 2020 14:18
PMCID: PMC7050488
Related URLs:
URI: https://repository.cshl.edu/id/eprint/38951

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