Dilated and hypertrophic cardiomyopathy mutations in troponin and alpha-tropomyosin have opposing effects on the calcium affinity of cardiac thin filaments.
A missense mutation R141W in the strong tropomyosin-binding region of cardiac troponin T (cTnT) has recently been reported to cause dilated cardiomyopathy (DCM), following the first report of a DCM-causing deletion mutation DeltaK210.