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Liang, Winnie S.; Chen, Kewei; Lee, Wendy; Sidhar, Kunal; Corneveaux, Jason J.; Allen, April N.; Myers, Amanda; Villa, Stephen; Meechoovet, Bessie; Pruzin, Jeremy; Bandy, Daniel; Fleisher, Adam S.; Langbaum, Jessica B.S.; Huentelman, Matthew J.; Jensen, Kendall; Dunckley, Travis; Caselli, Richard J.; Kaib, Susan; Reiman, Eric M.
NeuroImage (Orlando, Fla.), 2011-Feb-01, Letnik: 54, Številka: 3Journal Article
In a genome-wide association study (GWAS) of late-onset Alzheimer's disease (AD), we found an association between common haplotypes of the GAB2 gene and AD risk in carriers of the apolipoprotein E (APOE) ε4 allele, the major late-onset AD susceptibility gene. We previously proposed the use of fluorodeoxyglucose positron emission tomography (FDG-PET) measurements as a quantitative pre-symptomatic endophenotype, more closely related to disease risk than the clinical syndrome itself, to help evaluate putative genetic and non-genetic modifiers of AD risk. In this study, we examined the relationship between the presence or absence of the relatively protective GAB2 haplotype and PET measurements of regional-to-whole brain FDG uptake in several AD-affected brain regions in 158 cognitively normal late-middle-aged APOEε4 homozygotes, heterozygotes, and non-carriers. GAB2 haplotypes were characterized using Affymetrix Genome-Wide Human SNP 6.0 Array data from each of these subjects. As predicted, the possibly protective GAB2 haplotype was associated with higher regional-to-whole brain FDG uptake in AD-affected brain regions in APOEε4 carriers. While additional studies are needed, this study supports the association between the possibly protective GAB2 haplotype and the risk of late-onset AD in APOEε4 carriers. It also supports the use of brain-imaging endophenotypes to help assess possible modifiers of AD risk. ►The GAB2 gene was implicated in the first genome-wide association study of AD. ►FDG PET can be used as a presymptomatic endophenotype to assess AD risk factors. ►APOEe4 carriers with a protective GAB2 haplotype had higher FDG uptake in AD areas. ►The GAB2 haplotype may reduce the risk of AD in APOEe4 carriers.
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