Myotonic dystrophy type 1 (DM1), a multisystem disorder affecting skeletal and smooth muscle and other essential systems, belongs to a group of RNA gain-of-function disorders caused by the expansion of a CUG trinucleotide repeat (CUGexp) in the 3' untranslated region of the DM protein kinase (DMPK) gene. Furling and coworkers have developed an optimized human U7-snRNA containing a poly-CAG antisense sequence to target the CUGexp RNAs. These constructs cause specific degradation of pathogenic but not wild-type DMPK RNA products. By abolishing the RNA gain-of-function toxicity responsible for pathogenesis, these hU7-snRNAs could affect gene silencing in other RNA-dominant disorders expressing expanded repeats.
- Virginie François
- Arnaud F Klein
- Denis Furling