Absence of C9ORF72 expanded or intermediate repeats in autopsy-confirmed Parkinson's disease

Karen Nuytemans, Vanessa Inchausti, Gary W. Beecham, Liyong Wang, Dennis W. Dickson, John Q. Trojanowski, Virginia M.Y. Lee, Deborah C. Mash, Matthew P. Frosch, Tatiana M. Foroud, Lawrence S. Honig, Thomas J. Montine, Ted M. Dawson, Eden R. Martin, William K. Scott, Jeffery M. Vance

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Background: We have reported that intermediate repeat lengths of the C9ORF72 repeat are a risk factor for Parkinson's disease (PD) in a clinically diagnosed data set. Because 10% to 25% of clinically diagnosed PD have different diagnoses upon autopsy, we hypothesized that this may reflect phenotypic heterogeneity or concomitant pathology of other neurodegenerative disorders. Methods: We screened 488 autopsy-confirmed PD cases for expansion haplotype tag rs3849942T. In 196 identified haplotype carriers, the C9ORF72 repeat was genotyped using the repeat-primed polymerase chain reaction assay. Results: No larger (intermediate or expanded) repeats were found in these autopsy-confirmed PD samples. This absence of larger repeats is significantly different from the frequency in clinically diagnosed datasets (P=0.002). Conclusions: Our results suggest that expanded or intermediate C9ORF72 repeats in clinically diagnosed PD or parkinsonism might be an indication of heterogeneity in clinically diagnosed PD cases. Further studies are needed to elucidate the potential contribution of the C9ORF72 repeat to autopsy-confirmed PD.

Original languageEnglish (US)
Pages (from-to)827-830
Number of pages4
JournalMovement Disorders
Issue number6
StatePublished - May 2014


  • Autopsy confirmed
  • C9ORF72 repeat
  • Parkinson's disease
  • Parkinsonism

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology


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