The most common NMDs, listed by frequency, include Charcot–Marie–Tooth disease (CMT), Duchenne and Becker Muscular Dystrophies (DMD and BMD), Myotonic Dystrophy (DM1 and DM2), Facioscapulohumeral Muscular Dystrophy (FSHD1 and FSHD2), Spinal Muscular Atrophy (SMA), and Limb–Girdle Muscular Dystrophy (LGMD). This evidence concerns the gene SMCHD1 and proximal spinal muscular atrophy.