The G9055A polymorphism is located inMT-ATP6 (mitochondrially encoded adenosine triphosphate synthase 6) gene, leading to the amino acid substitution Ala177Thr in theATP synthase subunit A. Several studies were published that suggested a role ofthe haplogroup H in the risk of cardiovascular diseases, including ischaemiccardiomyopathy [16], hypertrophic cardiomyopathy [17], dilated cardiomyopathy[18], ischemic heart disease and myocardial infarction [19, 20]. This evidence concerns the gene MT-ATP6 and hypertrophic cardiomyopathy.