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Nucleic Acids Res. 2019 Apr 23;47(7):3450-3466. doi: 10.1093/nar/gkz014.

Splicing events in the control of genome integrity: role of SLU7 and truncated SRSF3 proteins.

Author information

1
Hepatology Program, CIMA, University of Navarra, Pamplona 31008, Spain.
2
Instituto de Investigaciones Sanitarias de Navarra-IdiSNA, Pamplona 31008, Spain.
3
CIBERehd, Instituto de Salud Carlos III, Madrid 28029, Spain.
4
Cytometry Unit, CIMA, University of Navarra, Pamplona 31008, Spain.
5
Hepatology Unit, Navarra University Clinic, Pamplona 31008, Spain.

Abstract

Genome instability is related to disease development and carcinogenesis. DNA lesions are caused by genotoxic compounds but also by the dysregulation of fundamental processes like transcription, DNA replication and mitosis. Recent evidence indicates that impaired expression of RNA-binding proteins results in mitotic aberrations and the formation of transcription-associated RNA-DNA hybrids (R-loops), events strongly associated with DNA injury. We identify the splicing regulator SLU7 as a key mediator of genome stability. SLU7 knockdown results in R-loops formation, DNA damage, cell-cycle arrest and severe mitotic derangements with loss of sister chromatid cohesion (SCC). We define a molecular pathway through which SLU7 keeps in check the generation of truncated forms of the splicing factor SRSF3 (SRp20) (SRSF3-TR). Behaving as dominant negative, or by gain-of-function, SRSF3-TR impair the correct splicing and expression of the splicing regulator SRSF1 (ASF/SF2) and the crucial SCC protein sororin. This unique function of SLU7 was found in cancer cells of different tissue origin and also in the normal mouse liver, demonstrating a conserved and fundamental role of SLU7 in the preservation of genome integrity. Therefore, the dowregulation of SLU7 and the alterations of this pathway that we observe in the cirrhotic liver could be involved in the process of hepatocarcinogenesis.

PMID:
30657957
PMCID:
PMC6468163
DOI:
10.1093/nar/gkz014
[Indexed for MEDLINE]
Free PMC Article

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