Single-cut genome editing restores dystrophin expression in a new mouse model of muscular dystrophy

• Verfasst von: Amoasii, Leonela [VerfasserIn]
• Verfasst von: Schmidt, Florian [VerfasserIn]
• Verfasst von: Grimm, Dirk [VerfasserIn]
• Titel: Single-cut genome editing restores dystrophin expression in a new mouse model of muscular dystrophy
• Verf.angabe: Leonela Amoasii, Chengzu Long, Hui Li, Alex A. Mireault, John M. Shelton, Efrain Sanchez-Ortiz, John R. McAnally, Samadrita Bhattacharyya, Florian Schmidt, Dirk Grimm, Stephen D. Hauschka, Rhonda Bassel-Duby, and Eric N. Olson
• Jahr des Originals: 2018
• Fussnoten: Available in PMC 2018 January 02 ; Gesehen am 23.05.2018 ; This article has been corrected
• Titel Quelle: Enthalten in: Science translational medicine
• Jahr Quelle: 2017
• Band/Heft Quelle: 9(2017,418) Artikel-Nummer eaan8081, 23 Seiten
• ISSN Quelle: 1946-6242
• DOI: doi:10.1126/scitranslmed.aan8081
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1575419092

Abstract

Duchenne muscular dystrophy (DMD) is a severe, progressive muscle disease caused by mutations in the dystrophin gene. The majority of DMD mutations are deletions that prematurely terminate the dystrophin protein. Deletions of exon 50 of the dystrophin gene are among the most common single exon deletions causing DMD. Such mutations can be corrected by skipping exon 51, thereby restoring the dystrophin reading frame. Using clustered regularly interspaced short palindromic repeats/CRISPR-associated 9 (CRISPR/Cas9), we generated a DMD mouse model by deleting exon 50. These ΔEx50 mice displayed severe muscle dysfunction, which was corrected by systemic delivery of adeno-associated virus encoding CRISPR/Cas9 genome editing components. We optimized the method for dystrophin reading frame correction using a single guide RNA that created reframing mutations and allowed skipping of exon 51. In conjunction with muscle-specific expression of Cas9, this approach restored up to 90% of dystrophin protein expression throughout skeletal muscles and the heart of ΔEx50 mice. This method of permanently bypassing DMD mutations using a single cut in genomic DNA represents a step toward clinical correction of DMD mutations and potentially those of other neuromuscular disorders.