Key result
Rats carrying in-frame Dmd gene mutations exhibited reduced expression of truncated dystrophin, causing dystrophic muscle changes but no functional deficiency.
Why the study?
No animal model with in-frame mutations in Dmd had been established, leaving the effect of in-frame mutations on the dystrophin expression profile and disease progression of Becker muscular dystrophy unclear.
Answers are grounded in this paper and cite their sources.
First in-frame Dmd model enables BMD studies; leaves open clinical translation as preclinical evidence only.
Dystrophin, encoded by the DMD gene on the X chromosome, stabilizes the sarcolemma by linking the actin cytoskeleton with the dystrophin-glycoprotein complex (DGC). In-frame mutations in DMD cause a milder form of X-linked muscular dystrophy, called Becker muscular dystrophy (BMD), characterized by the reduced expression of truncated dystrophin. So far, no animal model with in-frame mutations in Dmd has been established. As a result, the effect of in-frame mutations on the dystrophin expression profile and disease progression of BMD remains unclear. In this study, we established a novel rat model carrying in-frame Dmd gene mutations (IF rats) and evaluated the pathology. We found that IF rats exhibited reduced expression of truncated dystrophin in a proteasome-independent manner. This abnormal dystrophin expression caused dystrophic changes in muscle tissues but did not lead to functional deficiency. We also found that the expression of additional dystrophin named dpX, which forms the DGC in the sarcolemma, was associated with the appearance of truncated dystrophin. In conclusion, the outcomes of this study contribute to the further understanding of BMD pathology and help elucidate the efficiency of dystrophin recovery treatments in Duchenne muscular dystrophy, a more severe form of X-linked muscular dystrophy.
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Teramoto et al. (2020) studied Becker muscular dystrophy. In-frame Dmd gene mutations was evaluated on Dystrophin expression profile and disease progression. Rats carrying in-frame Dmd gene mutations exhibited reduced expression of truncated dystrophin, causing dystrophic muscle changes but no functional deficiency.
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