Diagnosis of "sporadic" Huntington's disease

J Neurol Sci. 1995 Mar;129(1):51-5. doi: 10.1016/0022-510x(94)00250-r.


The diagnosis of Huntington's disease (HD) in patients with progressive chorea and mental impairment, but without similarly affected relatives, remains uncertain and impedes genetic counseling. Twenty patients with suspected HD, but with no family history of the disease underwent molecular analysis of the CAG repeat in the IT15 gene for HD. Eighteen patients displayed the HD expanded allele and two had CAG repeats in the normal range. Neuropsychological tests could be performed in 12 of the 20 patients. Of these 10 with the expanded allele presented the deficits typical of HD, but not the two patients without the HD mutation. This study shows that a neuropsychological pattern is specific to patients with the expanded CAG and that most isolated patients with suspected HD are in fact affected.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Alleles
  • Base Sequence
  • Female
  • Humans
  • Huntington Disease / diagnosis*
  • Huntington Disease / genetics*
  • Huntington Disease / psychology
  • Male
  • Middle Aged
  • Neuropsychological Tests
  • Repetitive Sequences, Nucleic Acid