TNNT2 and familial dilated cardiomyopathy: Currently, over 90 mutations have been identified in Tn subunits associated with hypertrophic cardiomyopathy, dilated cardiomyopathy, left ventricular non-compaction, and restrictive cardiomyopathy [53,54], with mutations in cTnT believed to have a frequency of 3–6% in DCM [55].