TTN and cardiomyopathy: TTN, GAA, LAMA2 and MYBPC3 harbored the most variants in the three subgroups which confirm the high impact of these genes in complex pathogenesis of cardiomyopathies and VT demonstrated in previous studies (Herman et al., 2012; Golbus et al., 2012; Bit-Avragim et al., 2001; Carboni et al., 2011).