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GAB2 alleles modify Alzheimer's risk in APOE epsilon4 carriers.


ABSTRACT: The apolipoprotein E (APOE) epsilon4 allele is the best established genetic risk factor for late-onset Alzheimer's disease (LOAD). We conducted genome-wide surveys of 502,627 single-nucleotide polymorphisms (SNPs) to characterize and confirm other LOAD susceptibility genes. In epsilon4 carriers from neuropathologically verified discovery, neuropathologically verified replication, and clinically characterized replication cohorts of 1411 cases and controls, LOAD was associated with six SNPs from the GRB-associated binding protein 2 (GAB2) gene and a common haplotype encompassing the entire GAB2 gene. SNP rs2373115 (p = 9 x 10(-11)) was associated with an odds ratio of 4.06 (confidence interval 2.81-14.69), which interacts with APOE epsilon4 to further modify risk. GAB2 was overexpressed in pathologically vulnerable neurons; the Gab2 protein was detected in neurons, tangle-bearing neurons, and dystrophic neuritis; and interference with GAB2 gene expression increased tau phosphorylation. Our findings suggest that GAB2 modifies LOAD risk in APOE epsilon4 carriers and influences Alzheimer's neuropathology.

SUBMITTER: Reiman EM 

PROVIDER: S-EPMC2587162 | biostudies-literature | 2007 Jun

REPOSITORIES: biostudies-literature

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GAB2 alleles modify Alzheimer's risk in APOE epsilon4 carriers.

Reiman Eric M EM   Webster Jennifer A JA   Myers Amanda J AJ   Hardy John J   Dunckley Travis T   Zismann Victoria L VL   Joshipura Keta D KD   Pearson John V JV   Hu-Lince Diane D   Huentelman Matthew J MJ   Craig David W DW   Coon Keith D KD   Liang Winnie S WS   Herbert RiLee H RH   Beach Thomas T   Rohrer Kristen C KC   Zhao Alice S AS   Leung Doris D   Bryden Leslie L   Marlowe Lauren L   Kaleem Mona M   Mastroeni Diego D   Grover Andrew A   Heward Christopher B CB   Ravid Rivka R   Rogers Joseph J   Hutton Michael L ML   Melquist Stacey S   Petersen Ron C RC   Alexander Gene E GE   Caselli Richard J RJ   Kukull Walter W   Papassotiropoulos Andreas A   Stephan Dietrich A DA  

Neuron 20070601 5


The apolipoprotein E (APOE) epsilon4 allele is the best established genetic risk factor for late-onset Alzheimer's disease (LOAD). We conducted genome-wide surveys of 502,627 single-nucleotide polymorphisms (SNPs) to characterize and confirm other LOAD susceptibility genes. In epsilon4 carriers from neuropathologically verified discovery, neuropathologically verified replication, and clinically characterized replication cohorts of 1411 cases and controls, LOAD was associated with six SNPs from t  ...[more]

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