Non-uniform dystrophin re-expression after CRISPR-mediated exon excision in the dystrophin/utrophin double-knockout mouse model of DMD.
Non-uniform dystrophin re-expression after CRISPR-mediated exon excision in the dystrophin/utrophin double-knockout mouse model of DMD.
复制标题
在肌营养不良蛋白/肌营养不良蛋白双敲除小鼠DMD模型中,crispr介导的外显子切除后肌营养不良蛋白的不均匀再表达。
DOI:
10.1016/j.omtn.2022.10.010
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发表时间:
2022-12-13
期刊:
影响因子:
--
通讯作者:
Roberts, Thomas C.
中科院分区:
文献类型:
--
作者:
Hanson, Britt;Stenler, Sofia;Ahlskog, Nina;Chwalenia, Katarzyna;Svrzikapa, Nenad;Coenen-Stass, Anna M. L.;Weinberg, Marc S.;Wood, Matthew J. A.;Roberts, Thomas C.
Duchenne muscular dystrophy (DMD) is the most prevalent inherited myopathy affecting children, caused by genetic loss of the gene encoding the dystrophin protein. Here we have investigated the use of the Staphylococcus aureus CRISPR-Cas9 system and a double-cut strategy, delivered using a pair of adeno-associated virus serotype 9 (AAV9) vectors, for dystrophin restoration in the severely affected dystrophin/utrophin double-knockout (dKO) mouse. Single guide RNAs were designed to excise Dmd exon 23, with flanking intronic regions repaired by non-homologous end joining. Exon 23 deletion was confirmed at the DNA level by PCR and Sanger sequencing, and at the RNA level by RT-qPCR. Restoration of dystrophin protein expression was demonstrated by western blot and immunofluorescence staining in mice treated via either intraperitoneal or intravenous routes of delivery. Dystrophin restoration was most effective in the diaphragm, where a maximum of 5.7% of wild-type dystrophin expression was observed. CRISPR treatment was insufficient to extend lifespan in the dKO mouse, and dystrophin was expressed in a within-fiber patchy manner in skeletal muscle tissues. Further analysis revealed a plethora of non-productive DNA repair events, including AAV genome integration at the CRISPR cut sites. This study highlights potential challenges for the successful development of CRISPR therapies in the context of DMD. CRISPR-Cas9-mediated exon excision resulted in dystrophin re-expression in the severely affected dystrophin/utrophin-null (dKO) mouse. Treatment was insufficient to extend lifespan, and dystrophin was expressed in a within-fiber patchy manner in treated skeletal muscle tissues. A plethora of non-productive editing events (including vector genome integration) were detected by long-read sequencing.
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