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Meta-analysis of the association between variants in SORL1 and Alzheimer disease.

ABSTRACT: OBJECTIVE:To reexamine the association between the neuronal sortilin-related receptor gene (SORL1) and Alzheimer disease (AD). DESIGN:Comprehensive and unbiased meta-analysis of all published and unpublished data from case-control studies for the SORL1 single-nucleotide polymorphisms (SNPs) that had been repeatedly assessed across studies. SETTING:Academic research institutions in the United States, the Netherlands, Canada, Belgium, the United Kingdom, Singapore, Japan, Sweden, Germany, France, and Italy. PARTICIPANTS:All published white and Asian case-control data sets, which included a total of 12,464 cases and 17,929 controls. MAIN OUTCOME MEASURES:Alzheimer disease according to the Diagnostic and Statistical Manual of Mental Disorders (Fourth Edition) and the National Institute of Neurological and Communicative Disorders and Stroke and the Alzheimer's Disease and Related Disorders Association (now known as the Alzheimer's Association). RESULTS:In the white data sets, several markers were associated with AD after correction for multiple testing, including previously reported SNPs 8, 9, and 10 (P < .001). In addition, the C-G-C haplotype at SNPs 8 through 10 was associated with AD risk (P < .001). In the combined Asian data sets, SNPs 19 and 23 through 25 were associated with AD risk (P < .001). The disease-associated alleles at SNPs 8, 9, and 10 (120,873,131-120,886,175 base pairs [bp]; C-G-C alleles), at SNP 19 (120,953,300 bp; G allele), and at SNPs 24 through 25 (120,988,611 bp; T and C alleles) were the same previously reported alleles. The SNPs 4 through 5, 8 through 10, 12, and 19 through 25 belong to distinct linkage disequilibrium blocks. The same alleles at SNPs 8 through 10 (C-G-C), 19 (G), and 24 and 25 (T and C) have also been associated with AD endophenotypes, including white matter hyperintensities and hippocampal atrophy on magnetic resonance imaging, cerebrospinal fluid measures of amyloid ?-peptide 42, and full-length SORL1 expression in the human brain. CONCLUSION:This comprehensive meta-analysis provides confirmatory evidence that multiple SORL1 variants in distinct linkage disequilibrium blocks are associated with AD.

SUBMITTER: Reitz C

PROVIDER: S-EPMC3086666 | biostudies-literature | 2011 Jan

REPOSITORIES: biostudies-literature

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Meta-analysis of the association between variants in SORL1 and Alzheimer disease.

Reitz Christiane C Cheng Rong R Rogaeva Ekaterina E Lee Joseph H JH Tokuhiro Shinya S Zou Fanggeng F Bettens Karolien K Sleegers Kristel K Tan Eng King EK Kimura Ryo R Shibata Nobuto N Arai Heii H Kamboh M Ilyas MI Prince Jonathan A JA Maier Wolfgang W Riemenschneider Matthias M Owen Michael M Harold Denise D Hollingworth Paul P Cellini Elena E Sorbi Sandro S Nacmias Benedetta B Takeda Masatoshi M Pericak-Vance Margaret A MA Haines Jonathan L JL Younkin Steven S Williams Julie J van Broeckhoven Christine C Farrer Lindsay A LA St George-Hyslop Peter H PH Mayeux Richard R

Archives of neurology 20110101 1

<h4>Objective</h4>To reexamine the association between the neuronal sortilin-related receptor gene (SORL1) and Alzheimer disease (AD).<h4>Design</h4>Comprehensive and unbiased meta-analysis of all published and unpublished data from case-control studies for the SORL1 single-nucleotide polymorphisms (SNPs) that had been repeatedly assessed across studies.<h4>Setting</h4>Academic research institutions in the United States, the Netherlands, Canada, Belgium, the United Kingdom, Singapore, Japan, Swe ...[more]

PMID: 21220680

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Project description:BACKGROUND:Single-nucleotide polymorphisms (SNPs) in 2 distinct regions of the gene for the sortilin-related receptor (SORL1) (bounded by consecutively numbered SNPs 8-10 and 22-25) were shown to be associated with Alzheimer disease (AD) in multiple ethnically diverse samples. OBJECTIVE:To test the hypothesis that SORL1 is associated with brain magnetic resonance imaging (MRI) measurements of atrophy and/or vascular disease. DESIGN, SETTING, AND PATIENTS:We evaluated the association of 30 SNPs spanning SORL1 with MRI measures of general cerebral atrophy, hippocampal atrophy, white matter hyperintensities, and overall cerebrovascular disease in 44 African American and 182 white sibships from the MIRAGE Study. We performed single- and 3-SNP haplotype association analyses using family-based tests. Haplotypes found to be significantly associated with at least 1 MRI trait were tested for association with 6 pathological traits in a separate sample of 69 white patients with autopsy-confirmed AD. RESULTS:In white patients, white matter hyperintensities were associated with multiple markers in the region encompassing SNPs 6 to 10, whereas cerebral and hippocampal atrophy were associated with markers from the region including SNPs 21 to 26. Examination of specific 3-SNP haplotypes from these 2 regions in the autopsy-confirmed cases of AD revealed association of white matter disease with SNPs 8 to 10 and association of hippocampal atrophy with SNPs 22 to 26. The haplotype CGC at SNPs 8 to 10 was associated with fewer white matter changes in the clinical (P<.001) and autopsy (P=.02) samples. CONCLUSIONS:Variants of SORL1 previously associated with AD are also associated with MRI and neuropathological measures of neurodegenerative and cerebrovascular disease. These findings not only support the hypothesis that multiple areas in SORL1 are of functional importance but also raise the possibility that multiple SORL1 variants influence amyloid precursor protein or endothelial lipoprotein processing or both in different regions of the brain.

Project description:Many epidemiologic studies have considered the association between blood pressure (BP) and Alzheimer disease, yet the relationship remains poorly understood.In parallel with work on the AlzRisk online database (www.alzrisk.org), we conducted a systematic review to identify all epidemiologic studies meeting prespecified criteria reporting on the association between hypertension, systolic BP, or diastolic BP and incident Alzheimer disease. When possible, we computed summary measures using random-effects models and explored potential heterogeneity related to age at BP assessment.Eighteen studies reporting on 19 populations met the eligibility criteria. We computed summary relative risks (RR(?)) for 3 measures of BP: hypertension (RR(?) = 0.97 [95% confidence interval = 0.80-1.16]); a 10-mm Hg increase in systolic BP (RR(?) = 0.95 [0.91-1.00]); and a 10-mm Hg increase in diastolic BP (RR(?) = 0.94 [0.85-1.04]). We were unable to compute summary estimates for the association between categories of systolic or diastolic BP and Alzheimer disease; however, there did not appear to be a consistent pattern across studies. After stratifying on age at BP assessment, we found a suggestion of an inverse association between late-life hypertension and Alzheimer disease and a suggestion of an adverse association between midlife diastolic hypertension and Alzheimer disease.Based on existing epidemiologic research, we cannot determine whether there is a causal association between BP and Alzheimer disease. Selection bias and reverse causation may account for the suggested inverse association between late-life hypertension on Alzheimer disease, but, given the expected direction of these biases, they are less likely to account for the suggestion that midlife hypertension increases risk. We advocate continuing systematic review; the AlzRisk database entry on this topic (www.alzrisk.org), which was completed in parallel with this work, will be updated as new studies are published.

Dataset Information

Meta-analysis of the association between variants in SORL1 and Alzheimer disease.

Publications

Meta-analysis of the association between variants in SORL1 and Alzheimer disease.

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