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). The gene discussed is TNNT2; the disease is hypertrophic cardiomyopathy.