Canine Model of Duchenne Muscular Dystrophy

Area of Science:

• Veterinary Medicine
• Genetics
• Neurology

Background:

• Duchenne muscular dystrophy (DMD) is a severe genetic disorder.
• Dystrophin-deficient canines are superior large animal models for DMD compared to mice due to physiological similarities.
• The Golden Retriever Muscular Dystrophy (GRMD) dog is a key model, with other breeds also identified.

Purpose of the Study:

• To describe the generation and maintenance of dystrophin-deficient canine models.
• To present protocols for adeno-associated virus (AAV) vector delivery for gene therapy in canines.
• To outline a muscle biopsy protocol for monitoring gene transfer efficacy.

Main Methods:

• Establishment and management of canine research colonies for DMD.
• Intramuscular and systemic AAV vector administration in neonatal and adult canines.
• Development of a muscle biopsy technique for assessing gene therapy outcomes.

Main Results:

• Dystrophin-deficient canines exhibit DMD phenotypes relevant to human patients.
• Protocols for AAV vector delivery (gene replacement/repair) were successfully implemented.
• Muscle biopsy monitoring allows for periodic assessment of gene transfer in treated canines.

Conclusions:

• Dystrophin-deficient dogs serve as an excellent large animal model for DMD research and therapeutic development.
• AAV-mediated gene therapy protocols are established for canine models.
• Standardized protocols facilitate the study of pathogenic mechanisms and therapeutic interventions in DMD.