TNNT2 and restrictive cardiomyopathy: Genotyping was positive for a heterozygous missense variant in TNNT2 (NM_001001430.2): c.518G>A (p.Arg173Gln) which affects a highly conserved domain that encodes for the sarcomeric protein troponin T, and is currently classified as pathogenic/likely pathogenic for hypertrophic cardiomyopathy(HCM), restrictive cardiomyopathy and DCM in several genetic databases [19,20,21,22].