Several causative genes including chromosome 9 open reading frame 72 (C9orf72, DeJesus-Hernandez et al., 2011), Cu/Zn-superoxide dismutase (SOD1; Rosen et al., 1993), TAR DNA-binding protein (TARDBP) which encodes TDP43 (Sreedharan et al., 2008), and fused in sarcoma (FUS; Vance et al., 2009) have been shown to be involved in the development of ALS. Here, SOD1 is linked to amyotrophic lateral sclerosis.