4.5 Article

A novel mouse model of Duchenne muscular dystrophy carrying a multi-exonic Dmd deletion exhibits progressive muscular dystrophy and early-onset cardiomyopathy

Journal

DISEASE MODELS & MECHANISMS
Volume 13, Issue 9, Pages -

Publisher

COMPANY BIOLOGISTS LTD
DOI: 10.1242/dmm.045369

Keywords

DMD; Cardiomyopathy; Deletion mutation; Mouse model; Muscular dystrophy

Funding

  1. Canadian Institutes of Health Research [6210100686]
  2. Jesse's Journey [6100100206]
  3. Solid Biosciences [6910000001]
  4. Restracomp Award (SickKids-University of Toronto Ontario Student Opportunity Trust Fund)
  5. Ontario Graduate Scholarship

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Duchenne muscular dystrophy (DMD) is a life-threatening neuromuscular disease caused by the lack of dystrophin, resulting in progressive muscle wasting and locomotor dysfunctions. By adulthood, almost all patients also develop cardiomyopathy, which is the primary cause of death in DMD. Although there has been extensive effort in creating animal models to study treatment strategies for DMD, most fail to recapitulate the complete skeletal and cardiac disease manifestations that are presented in affected patients. Here, we generated a mouse model mirroring a patient deletion mutation of exons 52-54 (Dmd Delta 52-54). The Dmd Delta 52-54 mutation led to the absence of dystrophin, resulting in progressive muscle deterioration with weakened muscle strength. Moreover, Dmd Delta 52-54 mice present with early-onset hypertrophic cardiomyopathy, which is absent in current pre-clinical dystrophin-deficient mouse models. Therefore, Dmd Delta 52-54 presents itself as an excellent preclinical model to evaluate the impact on skeletal and cardiac muscles for both mutation-dependent and -independent approaches.

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