Abstract
Myotonic dystrophy (DM1) is caused by the expansion of a trinucleotide repeat (CTG) located in the 3′untranslated region of the myotonic dystrophy protein kinase gene, for which currently there is no effective treatment. The data available suggest that misregulation of RNA homeostasis may play a major role in DM1 muscle pathogenesis. This indicates that the specific targeting of the mutant DMPK transcripts is essential to raise the rationale basis for the development of a specific gene therapy for DM1. We have produced a retrovirus which expresses a 149-bp antisense RNA complementary to the (CUG)13 repeats and to the 110-bp region following the repeats sequence to increase the specificity. This construct was introduced into human DM1 myoblasts, resulting in a preferential decrease in mutant DMPK transcripts, and effective restoration of human DM1 myoblast functions such as myoblast fusion and the uptake of glucose. It was previously shown that delay of muscle differentiation and insulin resistance in DM1 are associated with misregulation of CUGBP1 protein levels. The analysis of CUGBP1 levels and activity in DM1 cells expressing the antisense RNA indicated a correction of CUGBP1 expression in infected DM1 cells. We therefore show that current antisense RNA delivered in vitro using a retrovirus is not only capable of inhibiting mutant DMPK transcripts, but also can ameliorate dystrophic muscle pathology at the cellular levels.
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Acknowledgements
This work was supported by MDA (USA) grants and by grants from the Institutes of Health Research of Canada (IRSC), National Institutes of Health (AR01D44387 and AG16392) and the French Myopathy Association (AFM). We thank Dr Mahadevan for PUC18 5′UTR DMPK plasmid.
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Furling, D., Doucet, G., Langlois, MA. et al. Viral vector producing antisense RNA restores myotonic dystrophy myoblast functions. Gene Ther 10, 795–802 (2003). https://doi.org/10.1038/sj.gt.3301955
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DOI: https://doi.org/10.1038/sj.gt.3301955
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