Any autosomal recessive spastic ataxia in which the cause of the disease is a mutation in the MTPAP gene. The disease is MONDO_0013354 (spastic ataxia 4). Also known as: MTPAP autosomal recessive spastic ataxia, SPAX4, autosomal recessive spastic ataxia caused by mutation in MTPAP, autosomal recessive spastic ataxia type 4, spastic ataxia type 4.