Conditional Dmd ablation in muscle and brain causes profound effects on muscle function and neurobehavior

Area of Science:

• Biomedical Science
• Neuroscience
• Genetics

Background:

• Duchenne muscular dystrophy (DMD) is characterized by skeletal and cardiopulmonary weakness.
• A significant portion of DMD patients exhibit autism spectrum disorder traits.
• Dystrophin protein is vital for force transmission in skeletal muscle and plays roles in neurobehavior and cognition.

Purpose of the Study:

• To investigate the dual role of dystrophin in skeletal muscle physiology and neurobehavior.
• To understand the consequences of dystrophin deficiency in both muscle and brain tissues.

Main Methods:

• Utilized constitutive and inducible deletion models of muscle dystrophin in mice.
• Performed transcriptomic analysis on Dmd mKO muscles.
• Examined neurobehavioral deficits in Purkinje dystrophin knockout (Dmd:Pcp2 KO) mice.

Main Results:

• Dystrophin deletion in skeletal muscle led to myopathy, dystrophic histopathology, and functional deficits.
• Transcriptomic analysis revealed dysregulated ECM and cytokine pathways in Dmd mKO muscles.
• Dmd:Pcp2 KO mice exhibited deficits in social approach, social memory, and spatial memory.

Conclusions:

• Dystrophin expression is essential for normal skeletal muscle function.
• Dystrophin is also critical for maintaining normal neurobehavioral and cognitive functions.
• These findings underscore the multifaceted importance of dystrophin in physiological and neurological health.