Damaging variants in TTN accounted for 42.9% of genotype-positive DCM cases, followed by LMNA (16.7%), Bcl-2 associated athanogene 3 (BAG3; 7.1%), and DSP (7.1%; Table 2; Tables S3 through S5). Here, LMNA is linked to familial dilated cardiomyopathy.