For example, SPG11 and KIF5A have been found to be pathogenic in both ALS and SPG (Stevanin et al., 2007; Orlacchio et al., 2010; Nicolas et al., 2018), and SPTLC1 has been recognized as a novel risk gene factor in ALS and HSAN2 (Lone et al., 2022). This evidence concerns the gene KIF5A and amyotrophic lateral sclerosis.