Monarch Disease Ontology entry MONDO_0007270 (cardiomyopathy, familial restrictive, 1) is any familial isolated restrictive cardiomyopathy in which the cause of the disease is a mutation in the TNNI3 gene. Also known as: TNNI3 familial isolated restrictive cardiomyopathy, cardiomyopathy, familial restrictive, type 1, familial isolated restrictive cardiomyopathy caused by mutation in TNNI3.