Any familial isolated dilated cardiomyopathy in which the cause of the disease is a mutation in the TNNC1 gene. The disease is MONDO_0012745 (dilated cardiomyopathy 1Z). Also known as: CMD1Z, TNNC1 familial isolated dilated cardiomyopathy, cardiomyopathy, dilated, type 1Z, dilated cardiomyopathy type 1Z, familial isolated dilated cardiomyopathy caused by mutation in TNNC1.