Spastic Ataxia 8, Autosomal Recessive, with Hypomyelinating Leukodystrophy, also known as spax8, is related to nkx6-2-related disorder. An important gene associated with Spastic Ataxia 8, Autosomal Recessive, with Hypomyelinating Leukodystrophy is NKX6-2 (NK6 Homeobox 2). Affiliated tissues include spinal cord and brain, and related phenotypes are abnormal pyramidal sign and nystagmus