A scalable, clinically severe pig model for Duchenne muscular dystrophy
Disease Models & Mechanisms(2021)
Abstract
Large animal models for Duchenne muscular dystrophy (DMD) are crucial for preclinical evaluation of novel diagnostic procedures and treatment strategies. Pigs cloned from male cells lacking DMD exon 52 ( DMD Δ52) resemble molecular, clinical and pathological hallmarks of DMD, but cannot be propagated by breeding due to death before sexual maturity. Therefore, female DMD +/- carriers were generated. A single founder animal had 11 litters with 29 DMD Y/-, 34 DMD +/- as well as 36 male and 29 female wild-type (WT) offspring. Breeding with F1 and F2 DMD +/- carriers resulted in additional 114 DMD Y/- piglets. The majority of them survived for 3-4 months, providing large cohorts for experimental studies. Pathological investigations and proteome studies of skeletal muscles and myocardium confirmed the resemblance of human disease mechanisms. Importantly, DMD Y/- pigs reveal progressive fibrosis of myocardium and increased expression of connexin-43, associated with significantly reduced left ventricular fractional shortening and ejection fraction already at age 3 months. Furthermore, behavioral tests provided evidence for impaired cognitive ability of DMD Y/- pigs. Our breeding cohort of DMD Δ52 pigs and standardized tissue repositories from DMD Y/- pigs, DMD +/- carriers, and WT littermate controls provide important resources for studying DMD disease mechanisms and for testing novel diagnostic procedures and treatment strategies.
### Competing Interest Statement
The authors have declared no competing interest.
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