Chorea can be one feature of mixed hereditary ataxias, mainly spinocerebellar ataxia types 1, 2, and 3 (SCA1, SCA2, SCA3), dentatorubral-pallidoluysian atrophy (DRPLA), Friedreich ataxia, ataxia telangiectasia, and ataxias with oculomotor apraxia. The gene discussed is ATXN3; the disease is dentatorubral-pallidoluysian atrophy.