To investigate whether ROS plays an important role in the pathogenesis of PLEKHM2-deficient cardiomyopathy, we administered oxidative stress activator, lipopolysaccharides (LPS) to WT hiPSC-CMs and PLEKHM2-KO hiPSC-CMs, and observed the effects on myocardial mitochondrial function, calcium handling, and contractility at day 40. This evidence concerns the gene PLEKHM2 and cardiomyopathy.