Dysferlin deficiency confers increased susceptibility to coxsackievirus-induced cardiomyopathy

Area of Science:

• Cardiovascular Science
• Virology
• Genetics

Background:

• Coxsackievirus infection causes viral myocarditis and dilated cardiomyopathy, leading causes of pediatric cardiovascular mortality.
• Host genetic factors and mechanisms of viral damage to cardiac function are not fully understood.
• Dysferlin, a muscle transmembrane protein, is crucial for membrane repair; its deficiency is linked to muscular dystrophies and cardiomyopathy.

Purpose of the Study:

• To investigate the role of dysferlin in susceptibility to coxsackievirus infection and viral myocarditis.
• To elucidate the mechanisms by which coxsackievirus infection leads to cardiac dysfunction and dilated cardiomyopathy.

Main Methods:

• Utilized naturally occurring and genetically engineered dysferlin-deficient mice.
• Assessed susceptibility to coxsackievirus infection and myocardial damage in these models.
• Investigated the cleavage of dysferlin following coxsackieviral infection.

Main Results:

• Dysferlin deficiency significantly increased susceptibility to coxsackievirus infection and myocardial damage.
• Coxsackieviral infection led to the cleavage of dysferlin via viral proteinases.
• This cleavage represents a key mechanism in virus-induced cardiac dysfunction.

Conclusions:

• Dysferlin deficiency is identified as a novel host risk factor for viral myocarditis.
• The study reveals a critical mechanism involving dysferlin cleavage in coxsackievirus-induced cardiac dysfunction and dilated cardiomyopathy development.