Spinal muscular atrophy (SMA) is a heritable, autosomal recessive neuromuscular disorder, which encompasses a broader group of disease subtypes all sharing loss-of-function mutations/conversion or deletion in the survival of motor neurons 1 (SMN1) gene (Lefebvre et al. 1995; Arnold et al. 2015). This evidence concerns the gene SMN1 and proximal spinal muscular atrophy.