We also assessed the dilated cardiomyopathy in HSP60CKO mice by measuring mRNA levels of cardiac fetal genes including atrial natriuretic factor (ANF), brain natriuretic peptide (BNP), α-myosin heavy chain (αMHC), and β-myosin heavy chain (βMHC). This evidence concerns the gene NPPA and dilated cardiomyopathy.