Other HSP subtypes associated with PN may include SPG2, SPG3A, SPG5, SPG6, SPG7, SPG10, SPG25, SPG27, SPG30, SPG31, SPG55, SPG56, SPOAN syndrome, and mutations in the mitochondrial ATP6 gene. The gene discussed is KIF1A; the disease is poikiloderma with neutropenia.