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Making the cut
Mutations in the dystrophin gene cause Duchenne muscular dystrophy (DMD), a fatal childhood muscle disease. To optimize the correction of DMD mutations by CRISPR/Cas9 gene editing, Amoasii et al. first generated mice that had exon 50 deleted, a common human mutational “hotspot” region of the dystrophin gene. The authors then reported a method in which a single cut in genomic DNA encoding dystrophin with CRISPR/Cas9 in these engineered mice resulted in up to 90% restoration of dystrophin expression in mouse skeletal and heart muscles. This method of permanently bypassing DMD mutations using a single genomic cut suggests that this strategy may have potential for efficiently correcting DMD mutations.
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