dilated cardiomyopathy 1BB (MONDO_0013030) is any familial isolated dilated cardiomyopathy in which the cause of the disease is a mutation in the DSG2 gene. Also known as: CMD1BB, DSG2 familial isolated dilated cardiomyopathy, cardiomyopathy, dilated, type 1Bb, dilated cardiomyopathy type 1BB, familial isolated dilated cardiomyopathy caused by mutation in DSG2.