TTN and familial dilated cardiomyopathy: In the past 20 years, with the help of next‐generation sequencing, several mutations have been identified as DCM marker genes,5, 6, 7 which are LMNA44, MYH7, TNNT2, TTN, RBM20, BAG3 and so on.8, 9, 10, 11, 12