Huntington's disease-like 2 (HDL2) in North America and Japan

Russell L. Margolis, Susan E. Holmes, Adam Rosenblatt, Lisa Gourley, Elizabeth O'Hearn, Christopher A. Ross, William K. Seltzer, Ruth H. Walker, Tetsuo Ashizawa, Astrid Rasmussen, Michael Hayden, Elisabeth W. Almqvist, Juliette Harris, Stanley Fahn, Marcy E. MacDonald, Jayalakshmi Mysore, Takayoshi Shimohata, Shoji Tsuji, Nicholas Potter, Kazuhiro NakasoYoshiki Adachi, Kenji Nakashima, Thomas Bird, Amanda Krause, Penny Greenstein

Research output: Contribution to journalArticlepeer-review

Abstract

Huntington's Disease-like 2 (HDL2) is a progressive, autosomal dominant, neurodegenerative disorder with marked clinical and pathological similarities to Huntington's disease (HD). The causal mutation is a CTG/CAG expansion mutation on chromosome 16q24.3, in a variably spliced exon of junctophilin-3. The frequency of HDL2 was determined in nine independent series of patients referred for HD testing or selected for the presence of an HD-like phenotype in North America or Japan. The repeat length, ancestry, and age of onset of all North American HDL2 cases were determined. The results show that HDL2 is very rare, with a frequency of 0 to 15% among patients in the nine case series with an HD-like presentation who do not have the HD mutation. HDL2 is predominantly, and perhaps exclusively, found in individuals of African ancestry. Repeat expansions ranged from 44 to 57 triplets, with length instability in maternal transmission detected in a repeat of 33 triplets. A younger age of onset is correlated with a longer repeat length (r2 = 0.29, p = 0.0098). The results further support the evidence that the repeat expansion at the chromosome 16q24.3 locus is the direct cause of HDL2 and provide preliminary guidelines for the genetic testing of patients with an HD-like phenotype.

Original languageEnglish (US)
Pages (from-to)670-674
Number of pages5
JournalAnnals of neurology
Volume56
Issue number5
DOIs
StatePublished - Nov 2004

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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