F110I and R278C troponin T mutations that cause familial hypertrophic cardiomyopathy affect muscle contraction in transgenic mice and reconstituted human cardiac fibers.

We have studied the physiological effects of the troponin T (TnT) F110I and R278C mutations associated with familial hypertrophic cardiomyopathy (FHC) in humans. Three to four-month-old transgenic (Tg) mice expressing F110I-TnT and R278C-TnT did not develop significant hypertrophy or ventricular fibrosis even after chronic exercise challenge. The F110I mutation impaired acute exercise tolerance, whereas R278C did not.