Mutations in various genes such as TTN, LMNA, MYH7, BAG3, TNNT2, FLNC, RBM20, SCN5A, PLN, TNNC1, TNNI3, and TPM1 are linked to the development of DCM [3].We investigated the expression of these genes between donor and DCM samples at the single cell level, but no significant differences were observed (Fig. S7). Here, TNNI3 is linked to familial dilated cardiomyopathy.