Head injury, α-synuclein Rep1, and Parkinson's disease.

Abstract:

OBJECTIVE:To test the hypothesis that variability in SNCA Rep1, a polymorphic dinucleotide microsatellite in the promoter region of the gene encoding α-synuclein, modifies the association between head injury and Parkinson's disease (PD) risk. METHODS:Participants in the Farming and Movement Evaluation (FAME) and the Study of Environmental Association and Risk of Parkinsonism using Case-Control Historical Interviews (SEARCH), 2 independent case-control studies, were genotyped for Rep1 and interviewed regarding head injuries with loss of consciousness or concussion prior to Parkinson's disease (PD) diagnosis. Logistic regression modeling adjusted for potential confounding variables and tested interaction between Rep1 genotype and head injury. RESULTS:Consistent with prior reports, relative to medium-length Rep1, short Rep1 genotype was associated with reduced PD risk (pooled odds ratio [OR], 0.7; 95% confidence interval [CI], 0.5-0.9), and long Rep1 with increased risk (pooled OR, 1.4; 95% CI, 0.95-2.2). Overall, head injury was not significantly associated with PD (pooled OR, 1.3; 95% CI, 0.9-1.8). However, head injury was strongly associated with PD in those with long Rep1 (FAME OR, 5.4; 95% CI, 1.5-19; SEARCH OR, 2.3; 95% CI, 0.6-9.2; pooled OR, 3.5; 95% CI 1.4-9.2, p-interaction = 0.02). Individuals with both head injury and long Rep1 were diagnosed 4.9 years earlier than those with neither risk factor (p = 0.03). INTERPRETATION:While head injury alone was not associated with PD risk, our data suggest head injury may initiate and/or accelerate neurodegeneration when levels of synuclein are high, as in those with Rep1 expansion. Given the high population frequency of head injury, independent verification of these results is essential.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Goldman SM,Kamel F,Ross GW,Jewell SA,Bhudhikanok GS,Umbach D,Marras C,Hauser RA,Jankovic J,Factor SA,Bressman S,Lyons KE,Meng C,Korell M,Roucoux DF,Hoppin JA,Sandler DP,Langston JW,Tanner CM

doi

10.1002/ana.22499

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

40-8

issue

1

eissn

0364-5134

issn

1531-8249

journal_volume

71

pub_type

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