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• W2766378797 abstract "Background There is increasing interest in the concept of atrial cardiomyopathy, but the underlying molecular and mechanistic determinants remain poorly defined. We identified a family with heritable atrial cardiomyopathy manifesting as progressive atrial‐selective electromechanical dysfunction, tachyarrhythmias, and bradyarrhythmias requiring pacemaker implantation. Myosin light‐chain 4 ( MYL4 ), encoding the atrial‐selective essential myosin light chain, was identified as a candidate gene. We used genetically modified rat models to investigate the role of MYL 4 in atrial cardiomyopathy. Methods and Results Exome sequencing and systematic bioinformatic analyses identified a rare missense variant of MYL 4 (c.31G>A [ p.E11K ]) in a large multiplex atrial cardiomyopathy family pedigree. The mutation cosegregated with atrial standstill (selected as the principal presenting trait) with a logarithm of the odds score of 5.3. The phenotype of rats with MYL 4 mutation knock‐in confirmed the causative role of the mutation. MYL 4 knockout rats showed a similar atrial cardiomyopathy phenotype, whereas rats with an adjacent 4‐amino‐acid deletion showed no phenotype. Both MYL 4 p.E11K knock‐in rats and MYL 4 knockout rats showed progressive atrial electrophysiological, contractile, and fibrotic abnormalities, similar to affected patients. Biochemical analyses of MYL 4 p.E11K mutation rats showed activation of proapoptotic and profibrotic signaling, along with increased atrial‐cardiomyocyte terminal deoxynucleotidyl transferase dUTP nick end labeling staining, suggesting enhanced apoptotic cell death, findings that were mimicked by in vitro adenoviral transfer of the mutant gene to neonatal‐rat cardiomyocytes. Conclusions Loss‐of‐function MYL 4 gene variants cause progressive atrial cardiomyopathy in humans and rats. Our findings identify MYL 4 as a key gene required for atrial contractile, electrical and structural integrity. These results improve our understanding of the molecular basis of atrial cardiomyopathy and introduce new models for further mechanistic analysis." @default.
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• W2766378797 date "2017-11-01" @default.
• W2766378797 modified "2023-10-13" @default.
• W2766378797 title "Dysfunction of Myosin Light‐Chain 4 (MYL4) Leads to Heritable Atrial Cardiomyopathy With Electrical, Contractile, and Structural Components: Evidence From Genetically‐Engineered Rats" @default.
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• W2766378797 doi "https://doi.org/10.1161/jaha.117.007030" @default.
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