dilated cardiomyopathy 1G (MONDO_0011400, a Monarch Disease Ontology id) is any familial isolated dilated cardiomyopathy in which the cause of the disease is a mutation in the TTN gene. Also known as: CMD1G, TTN familial isolated dilated cardiomyopathy, cardiomyopathy, dilated, type 1G, dilated cardiomyopathy type 1G, familial isolated dilated cardiomyopathy caused by mutation in TTN.