SMN1 and Pelizeaus-Merzbacher spectrum disorder: Some of the non-PMD are spinal muscular atrophy (SMN1) [89], Friedreich ataxia (FXN) [90], Charcot-Marie-Tooth disease type 2 K (GDAP1) [89], hereditary spastic paraplegia 7 (SPG7), Wilson disease (ATP7B)[89], methylmalonic aciduria and propionic aciduria [91, 92], fatty acid oxidation disorders [93], argininosuccinic aciduria [94], purine and pyrimidine synthesis disorders [95], BCAP31 associated encephalopathy [96] and riboflavin transporter deficiency (SLC52A2,  SLC52A3) [97].