2012). Here we report new genetic data obtained by whole exome sequencing, concerning patients #13 and #15 from that previous study, who in addition to the encephalopathy developed renal dysfunction and cardiomyopathy, respectively. We have identified novel mutations in NARS2 (OMIM: 612803) in patient #13 and PARS2 (OMIM: 612036) in patient #15. The gene discussed is NARS2; the disease is cardiomyopathy.