C9ORF72 intermediate repeat copies are a significant risk factor for Parkinson disease.

Abstract:

:We set out to determine whether expansions in the C9ORF72 repeat found in amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) families are associated with Parkinson disease (PD). We determined the repeat size in a total of 889 clinically ascertained patients (including PD and essential tremor plus Parkinsonism (ETP)) and 1144 controls using a repeat-primed PCR assay. We found that large C9ORF72 repeat expansions (>30 repeats) were not contributing to PD risk. However, PD and ETP cases had a significant increase in intermediate (>20 to 30+) repeat copies compared to controls. Overall, 14 cases (13 PD, 1 ETP) and three controls had >20 repeat copies (Fisher's exact test p = 0.002). Further, seven cases and no controls had >23 repeat copies (p = 0.003). Our results suggest that intermediate copy numbers of the C9ORF72 repeat contribute to risk for PD and ETP. This also suggests that PD, ALS and FTD share some pathophysiological mechanisms of disease. Further studies are needed to elucidate the contribution of the C9ORF72 repeat in the overall PD population and to determine whether other common genetic risk factors exist between these neurodegenerative disorders.

journal_name

Ann Hum Genet

journal_title

Annals of human genetics

authors

Nuytemans K,Bademci G,Kohli MM,Beecham GW,Wang L,Young JI,Nahab F,Martin ER,Gilbert JR,Benatar M,Haines JL,Scott WK,Züchner S,Pericak-Vance MA,Vance JM

doi

10.1111/ahg.12033

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

351-63

issue

5

eissn

0003-4800

issn

1469-1809

journal_volume

77

pub_type

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