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Sherva, Richard; Tripodis, Yorghos; Bennett, David A; Chibnik, Lori B; Crane, Paul K; de Jager, Philip L; Farrer, Lindsay A; Saykin, Andrew J; Shulman, Joshua M; Naj, Adam; Green, Robert C
Alzheimer's & dementia, January 2014, Letnik: 10, Številka: 1Journal Article
Abstract Background Substantial interindividual variability exists in the disease trajectories of Alzheimer's disease (AD) patients. Some decline rapidly whereas others decline slowly, and there are no known explanations for this variability. We describe the first genome-wide association study to examine rate of cognitive decline in a sample of AD patients with longitudinal measures of cognition. Methods The discovery sample was 303 AD cases recruited in the Alzheimer’s Disease Neuroimaging Initiative and the replication sample was 323 AD cases from the Religious Orders Study and Rush Memory and Aging Project. In the discovery sample, Alzheimer's Disease Assessment Scale–cognitive subscale responses were tested for association with genome-wide single-nucleotide polymorphism (SNP) data using linear regression. We tested the 65 most significant SNPs from the discovery sample for association in the replication sample. Results We identified SNPs in the spondin 1 gene ( SPON1 ), the minor alleles of which were significantly associated with a slower rate of decline (rs11023139, P = 7.0 × 10−11 ) in the discovery sample. A SPON1 SNP 5.5 kb upstream was associated with decline in the replication sample (rs11606345, P = .002). Conclusion SPON1 has not been previously associated with AD risk, but is plausibly related because the gene product binds to the amyloid precursor protein and inhibits its cleavage by β-secretase. These data suggest that SPON1 may be associated with the differential rate of cognitive decline in AD.
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in: SICRIS
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