Long-term maintenance of dystrophin expression and resistance to injury of skeletal muscle in gene edited DMD mice

Molecular Therapy: Nucleic Acids

Ning Liu¹  Francesco Chemello¹  Jiwoong Kim¹  Lin Xu²  Eric N. Olson²  Yu Zhang²  Jian Huang²  Pradeep P.A. Mammen³  Dileep R. Karri³  Rhonda Bassel-Duby³  Yi-Li Min³ 

[1] Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA;Senator Paul D. Wellstone Muscular Dystrophy Cooperative Research Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA;Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA;

关键词: CRISPR/Cas9;    gene editing;    exon reframing;    Duchenne muscular dystrophy;    AAV;   

DOI  :  

来源: DOAJ

【 摘 要 】

Duchenne muscular dystrophy (DMD) is a lethal muscle disease caused by mutations in the dystrophin gene. CRISPR/Cas9 genome editing has been used to correct DMD mutations in animal models at young ages. However, the longevity and durability of CRISPR/Cas9 editing remained to be determined. To address these issues, we subjected ΔEx44 DMD mice to systemic delivery of AAV9-expressing CRISPR/Cas9 gene editing components to reframe exon 45 of the dystrophin gene, allowing robust dystrophin expression and maintenance of muscle structure and function. We found that genome correction by CRISPR/Cas9 confers lifelong expression of dystrophin in mice and that corrected skeletal muscle is highly durable and resistant to myofiber necrosis and fibrosis, even in response to chronic injury. In contrast, when muscle fibers were ablated by barium chloride injection, we observed a loss of gene edited dystrophin expression. Analysis of on- and off-target editing in aged mice confirmed the stability of gene correction and the lack of significant off-target editing at 18 months of age. These findings demonstrate the long-term durability of CRISPR/Cas9 genome editing as a therapy for maintaining the integrity and function of DMD muscle, even under conditions of stress.

【 授权许可】

Unknown