question: Which trinucleotide repeat disorders are affecting the nervous system?
answer: At least six neudegenerative disorders result from trinucleotide repeat expansion: X-linked spinal and bulbar muscular atrophy (SBMA), two fragile X syndromes of mental retardation (FRAXA and FRAXE), Huntington's disease (HD), spinocerebellar ataxia type 1 (SCA1), and dentatorubral-pallidoluysian atrophy (DRPLA).