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Genetic mutations and mechanisms in dilated cardiomyopathy McNally EM; Golbus JR; Puckelwartz MJJ Clin Invest 2013[Jan]; 123 (1): 19-26Genetic mutations account for a significant percentage of cardiomyopathies, which are a leading cause of congestive heart failure. In hypertrophic cardiomyopathy (HCM), cardiac output is limited by the thickened myocardium through impaired filling and outflow. Mutations in the genes encoding the thick filament components myosin heavy chain and myosin binding protein C (MYH7 and MYBPC3) together explain 75% of inherited HCMs, leading to the observation that HCM is a disease of the sarcomere. Many mutations are "private" or rare variants, often unique to families. In contrast, dilated cardiomyopathy (DCM) is far more genetically heterogeneous, with mutations in genes encoding cytoskeletal, nucleoskeletal, mitochondrial, and calcium-handling proteins. DCM is characterized by enlarged ventricular dimensions and impaired systolic and diastolic function. Private mutations account for most DCMs, with few hotspots or recurring mutations. More than 50 single genes are linked to inherited DCM, including many genes that also link to HCM. Relatively few clinical clues guide the diagnosis of inherited DCM, but emerging evidence supports the use of genetic testing to identify those patients at risk for faster disease progression, congestive heart failure, and arrhythmia.|*Mutation[MESH]|Animals[MESH]|Arrhythmias, Cardiac/etiology/genetics/metabolism/pathology/physiopathology[MESH]|Calcium-Binding Proteins/*genetics/metabolism[MESH]|Cardiac Myosins/*genetics/metabolism[MESH]|Cardiomyopathy, Dilated/complications/*genetics/metabolism/pathology/physiopathology[MESH]|Carrier Proteins/*genetics/metabolism[MESH]|Cytoskeleton/*genetics/metabolism/pathology[MESH]|Heart Failure/etiology/genetics/metabolism/pathology/physiopathology[MESH]|Humans[MESH]|Mitochondria/*genetics/metabolism/pathology[MESH]|Myocardium/metabolism/pathology[MESH]|Myosin Heavy Chains/*genetics/metabolism[MESH]|Sarcomeres/genetics/metabolism/pathology[MESH] |