Three circRNAs (hsa_circ_0003258, hsa_circ_0051238, and hsa_circ_0051239) associated with lamin A and C proteins in lamin A/C (LMNA) gene-linked dilated cardiomyopathy (DCM), along with one circRNA (hsa_circ_0089762) in ischemic DCM, were significantly overexpressed and suggested to be potential circulating diagnostic biomarkers for etiology-based diagnosis. The gene discussed is LMNA; the disease is dilated cardiomyopathy.