Desminopathies in muscle disease

Area of Science:

• Muscle Biology
• Cellular Cytoskeleton
• Genetic Disorders

Background:

• Desminopathies are a class of myopathies caused by desmin filament abnormalities.
• These disorders involve desmin network disorganization, aggregate formation, and sarcomeric damage in striated muscles.
• Clinical presentations are heterogeneous, often including skeletal myopathy, cardiomyopathy, and respiratory issues.

Purpose of the Study:

• To summarize the understanding of desminopathies, focusing on their molecular basis and clinical impact.
• To highlight the role of desmin and associated proteins in muscle structure and disease.
• To review findings from genetic studies and animal models.

Main Methods:

• Review of genetic mutations in desmin and associated proteins (e.g., alpha-B-crystallin, synemin).
• Analysis of phenotypes in patients with desmin-related myopathies.
• Examination of data from knockout and transgenic mouse models to understand desmin filament function.

Main Results:

• Desmin mutations and mutations in associated proteins contribute to desminopathies.
• Abnormal desmin filaments disrupt muscle architecture, leading to myopathy and cardiomyopathy.
• Alpha-B-crystallin gene mutations cause similar myopathies and cataracts.
• Mouse models demonstrate the critical role of desmin filaments in cell structure and disease pathogenesis.

Conclusions:

• Desminopathies result from disruptions in the desmin intermediate filament network, either through desmin mutations or mutations in associated proteins.
• The integrity of desmin filaments is crucial for maintaining muscle cell architecture and function.
• Understanding these molecular mechanisms is key to addressing the progressive nature of these myopathies.