Moreover, a significant correlation between the TNNT2 mRNA expression levels and the percentage of MHC-neo positive fibers is present when considering either all the muscle samples analyzed or the DM cohort, and this correlation is more evident in DM1 TA muscles, confirming that this gene is more expressed in skeletal muscle expressing fetal myosins. The gene discussed is MYH14; the disease is myotonic dystrophy type 1.