Spastic Ataxia 4, Autosomal Recessive, also known as spax4, is related to spastic ataxia 4 and spastic ataxia, and has symptoms including paraparesis, spastic An important gene associated with Spastic Ataxia 4, Autosomal Recessive is MTPAP (Mitochondrial Poly(A) Polymerase). Affiliated tissues include tongue, and related phenotypes are hyperreflexia and dysarthria