Second, we found TNNT2 under the linkage peak on chromosome 1 for QT, which harbors known mutations underlying hypertrophic cardiomyopathy (Thierfelder et al., 1994) and familial dilated cardiomyopathy (Kamisago et al., 2000). This evidence concerns the gene TNNT2 and familial dilated cardiomyopathy.