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- W2095690908 abstract "Background— PRKAG2 mutations cause glycogen-storage cardiomyopathy, ventricular preexcitation, and conduction system degeneration. A genetic approach that utilizes a binary inducible transgenic system was used to investigate the disease mechanism and to assess preventability and reversibility of disease features in a mouse model of glycogen-storage cardiomyopathy. Methods and Results— Transgenic (Tg) mice expressing a human N488I PRKAG2 cDNA under control of the tetracycline-repressible α-myosin heavy chain promoter underwent echocardiography, ECG, and in vivo electrophysiology studies. Transgene suppression by tetracycline administration caused a reduction in cardiac glycogen content and was initiated either prenatally (Tg OFF(E-8 weeks) ) or at different time points during life (Tg OFF(4–16 weeks) , Tg OFF(8–20 weeks) , and Tg OFF(>20 weeks) ). One group never received tetracycline, expressing transgene throughout life (Tg ON ). Tg ON mice developed cardiac hypertrophy followed by dilatation, ventricular preexcitation involving multiple accessory pathways, and conduction system disease, including sinus and atrioventricular node dysfunction. Conclusions— Using an externally modifiable transgenic system, cardiomyopathy, cardiac dysfunction, and electrophysiological disorders were demonstrated to be reversible processes in PRKAG2 disease. Transgene suppression during early postnatal development prevented the development of accessory electrical pathways but not cardiomyopathy or conduction system degeneration. Taken together, these data provide insight into mechanisms of cardiac PRKAG2 disease and suggest that glycogen-storage cardiomyopathy can be modulated by lowering glycogen content in the heart." @default.
- W2095690908 created "2016-06-24" @default.
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- W2095690908 date "2008-01-15" @default.
- W2095690908 modified "2023-10-11" @default.
- W2095690908 title "Reversibility of <i>PRKAG2</i> Glycogen-Storage Cardiomyopathy and Electrophysiological Manifestations" @default.
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- W2095690908 doi "https://doi.org/10.1161/circulationaha.107.726752" @default.
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