We have shown that a diet rich in saturated fats leading to obesity results in significant upregulation of Cav1.2, HCN4, Kir2.1, NCX1, SERCA2a, and RYR2 mRNA and significant downregulation of ERG mRNA in the left ventricle. This evidence concerns the gene KCNJ2 and obesity due to melanocortin 4 receptor deficiency.