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From SNPedia

Ataxia is a degenerative disease of the nervous system, which often includes the loss of full control of bodily movements. There are both hereditary and sporadic forms of ataxia, and among the inherited ataxias, there are both dominantly and recessively inherited forms.National Ataxia Foundation

Over 50 genes are known to potentially harbor pathogenic ataxia mutations, and the nature of the mutations can include repeat expansions. The most common adult-onset autosomal dominant ataxias are SCA1, SCA2, SCA3, SCA6, and SCA7, and the most common autosomal recessive ataxias (which are usually of childhood onset) are Friedreich ataxia, AOA1, AOA2, and ataxia-telangiectasia.[1]