A clear correlation was also present between the expression of the fetal TNNT2 isoform and DM histopathological score either when considering all DM muscles (Spearman test: r = 0.68, p < 0.0001) and DM1 BB (Spearman test: r = 0.80, p < 0.0001), DM2 BB (Spearman test: r = 0.67, p = 0.008), and DM1 TA (Spearman test: r = 0.61, p = 0.01) muscles separately. Here, TNNT2 is linked to myotonic dystrophy type 1.