Correction of the exon 2 duplication in DMD myoblasts by a single CRISPR/Cas9 system

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Exonic duplications account for 10–15% of all mutations in Duchenne muscular dystrophy (DMD), a severe hereditary neuromuscular disorder. We report a novel CRISPR (Clustered Regularly Interspaced Short Palindromic Repeat)/Cas9-based strategy to correct the most frequent (exon 2) duplication in the DMD gene by targeted deletion, and tested the efficacy of such an approach in patient-derived myogenic cells. We demonstrate restoration of wild-type dystrophin expression at transcriptional and protein level in myotubes derived from genome-edited myoblasts in the absence of selection.

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