Identification of SRSF10 as a regulator of SMN2 ISS-N1.

Frederiksen, Sabrina B, Holm, Lise L, Larsen, Martin R, Doktor, Thomas K, Andersen, Henriette S, Hastings, Michelle L, Hua, Yimin, Krainer, Adrian R, Andresen, Brage S (March 2021) Identification of SRSF10 as a regulator of SMN2 ISS-N1. Human Mutation, 42 (3). pp. 246-260. ISSN 1059-7794

DOI: 10.1002/humu.24149


Understanding the splicing code can be challenging as several splicing factors bind to many splicing-regulatory elements. The SMN1 and SMN2 silencer element ISS-N1 is the target of the antisense oligonucleotide drug, Spinraza, which is the treatment against spinal muscular atrophy. However, limited knowledge about the nature of the splicing factors that bind to ISS-N1 and inhibit splicing exists. It is likely that the effect of Spinraza comes from blocking binding of these factors, but so far, an unbiased characterization has not been performed and only members of the hnRNP A1/A2 family have been identified by Western blot analysis and nuclear magnetic resonance to bind to this silencer. Employing an MS/MS-based approach and surface plasmon resonance imaging, we show for the first time that splicing factor SRSF10 binds to ISS-N1. Furthermore, using splice-switching oligonucleotides we modulated the splicing of the SRSF10 isoforms generating either the long or the short protein isoform of SRSF10 to regulate endogenous SMN2 exon 7 inclusion. We demonstrate that the isoforms of SRSF10 regulate SMN1 and SMN2 splicing with different strength correlating with the length of their RS domain. Our results suggest that the ratio between the SRSF10 isoforms is important for splicing regulation.

Item Type: Paper
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > Alternative Splicing
diseases & disorders > congenital hereditary genetic diseases > spinal muscular atrophy
CSHL Authors:
Communities: CSHL labs > Krainer lab
SWORD Depositor: CSHL Elements
Depositing User: CSHL Elements
Date: March 2021
Date Deposited: 06 May 2021 15:55
Last Modified: 06 May 2021 15:55
PMCID: PMC7878440

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