The prevalence of DRPLA in the Japanese population is believed to be 2–7 in 1,000,000. DRPLA is observed relatively less frequently in other ethnic populations and an analysis of normal ATN1 alleles has demonstrated that CAG repeat lengths greater than 17 are significantly more frequent in the Japanese population.
Dentatorubral–pallidoluysian atrophy
Cerebellar abiotrophy
Central chromatolysis
Corticobasal degeneration
Olivopontocerebellar atrophy
Spinal muscular atrophy with lower extremity predominance 1
Cerebellar degeneration
Multi/minicore myopathy