Multiple candidate gene analysis identifies alpha-synuclein as a susceptibility gene for sporadic Parkinson's disease.
Parkinson's disease (PD), one of the most common human neurodegenerative diseases, is characterized by the loss of dopaminergic neurons in the substantia nigra of the midbrain. PD is a complex disorder with multiple genetic and environmental factors influencing disease risk. To identify susceptible genes for sporadic PD, we performed case-control association studies of 268 single nucleotide polymorphisms (SNPs) in 121 candidate genes. In two independent case-control populations, we found that a SNP in alpha-synuclein (SNCA), rs7684318, showed the strongest association with PD (P=5.0 x 10(-10)). Linkage disequilibrium (LD) analysis using 29 SNPs in a region around rs7684318 revealed that the entire SNCA gene lies within a single LD block (D'>0.9) spanning approximately 120 kb. A tight LD group (r2>0.85) of six SNPs, including rs7684318, associated most strongly with PD (P=2.0 x 10(-9)-1.7 x 10(-11)). Haplotype association analysis did not show lower P-values than any single SNP within this group. SNCA is a major component of Lewy bodies, the pathological hallmark of PD. Aggregation of SNCA is thought to play a crucial role in PD. SNCA expression levels tended to be positively correlated with the number of the associated allele in autopsied frontal cortices. These findings establish SNCA as a definite susceptibility gene for sporadic PD.
Mizuta
Ikuko
I
Division of Clinical Genetics, Department of Medical Genetics, Osaka University Graduate School of Medicine, Osaka, Japan.
Satake
Wataru
W
Nakabayashi
Yuko
Y
Ito
Chiyomi
C
Suzuki
Satoko
S
Momose
Yoshio
Y
Nagai
Yoshitaka
Y
Oka
Akira
A
Inoko
Hidetoshi
H
Fukae
Jiro
J
Saito
Yuko
Y
Sawabe
Motoji
M
Murayama
Shigeo
S
Yamamoto
Mitsutoshi
M
Hattori
Nobutaka
N
Murata
Miho
M
Toda
Tatsushi
T
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D002540:Cerebral Cortex / Q000166:cytology / Q000378:metabolism; D005260:Female; D005838:Genotype; D006801:Humans; D015810:Linkage Disequilibrium; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D051844:alpha-Synuclein / Q000235:genetics*
C497604:SNCA protein, human; D051844:alpha-Synuclein