Human γ2-AMPK Mutations.

Area of Science:

• Genetics
• Cardiology
• Molecular Biology

Background:

• Dominant mutations in the PRKAG2 gene, encoding the regulatory gamma2-subunit of AMP-activated protein kinase (AMPK), lead to a distinct inherited cardiac disease.
• This condition is characterized by a spectrum of cardiac abnormalities, including left ventricular hypertrophy, ventricular pre-excitation, atrial tachyarrhythmia, and cardiac conduction disease.
• The link between AMPK, a key cellular energy sensor, and inherited cardiac conditions has spurred significant research into AMPK's cardiac functions.

Purpose of the Study:

• To provide an overview of human diseases caused by pathogenic variants in PRKAG2.
• To outline the discovery, clinical genetics, pathogenesis, and disease models of PRKAG2-associated cardiac disease.
• To present clinical perspectives on the cardiomyopathy, extracardiac features, prognosis, and management of PRKAG2 mutations.

Main Methods:

• Review of human genetic studies identifying PRKAG2 mutations.
• Analysis of clinical data from patients with PRKAG2-associated cardiac disease.
• Evaluation of disease models to elucidate pathogenic mechanisms.

Main Results:

• Pathogenic variants in PRKAG2 result in a highly penetrant cardiac phenotype.
• Key features include left ventricular hypertrophy, ventricular pre-excitation, atrial tachyarrhythmia, conduction disease, and myocardial glycogen storage.
• Extracardiac features and prognosis are also discussed.

Conclusions:

• PRKAG2 mutations represent a significant cause of inherited cardiac disease with a defined clinical spectrum.
• Understanding the role of AMPK in cardiac metabolism and function is essential for unraveling the pathogenesis of these cardiomyopathies.
• Comprehensive clinical management strategies are necessary for patients with PRKAG2-associated cardiac conditions.