KCNQ1 and familial dilated cardiomyopathy: Based on their relative frequencies HGMD mutations in LAMA2 (34.3%), MYBPC3 (31.2%), MYH6 (18.7%), KCNQ1 (15.6%), GAA (15.6%) and DSG2 (12.5%) were predominant in the DCM VT subgroup (Fig. 5).