Dentatorubral and pallidoluysian atrophy expansion of an unstable CAG trinucleotide on chromosome 12p

Nat Genet. 1994 Jan;6(1):14-8. doi: 10.1038/ng0194-14.


Dentatorubral and pallidoluysian atrophy (DRPLA) is an autosomal dominant neurodegenerative disorder characterized by combined systemic degeneration of the dentatofugal and pallidofugal pathways. We investigated a candidate gene and found that DRPLA patients had an expanded CAG trinucleotide repeat in a gene on the short arm of chromosome 12. The repeat size varied from 7-23 in normal individuals. In patients one allele was expanded to between 49-75 repeats or occasionally even more. Expansion was usually associated with paternal transmission and only occasionally with maternal transmission. Repeat size showed a close correlation with age of onset of symptoms and disease severity. We conclude that DRPLA is the seventh genetic disorder known to be associated with expansion of an unstable trinucleotide repeat.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alleles
  • Amino Acid Sequence
  • Atrophy
  • Base Sequence
  • Brain / pathology
  • Cerebellar Ataxia / genetics
  • Chromosomes, Human, Pair 12*
  • DNA Primers / genetics
  • Female
  • Globus Pallidus / pathology
  • Humans
  • Male
  • Molecular Sequence Data
  • Nervous System Diseases / genetics*
  • Nervous System Diseases / pathology
  • Oligodeoxyribonucleotides / genetics
  • Pedigree
  • Repetitive Sequences, Nucleic Acid*


  • DNA Primers
  • Oligodeoxyribonucleotides