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Expression of Novel Alzheimer’s Disease Risk Genes in Control and Alzheimer’s Disease Brains
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Expression of Novel Alzheimer’s Disease Risk Genes in Control and Alzheimer’s Disease Brains
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Journal Article
Expression of Novel Alzheimer’s Disease Risk Genes in Control and Alzheimer’s Disease Brains
2012
Overview
Late onset Alzheimer's disease (LOAD) etiology is influenced by complex interactions between genetic and environmental risk factors. Large-scale genome wide association studies (GWAS) for LOAD have identified 10 novel risk genes: ABCA7, BIN1, CD2AP, CD33, CLU, CR1, EPHA1, MS4A6A, MS4A6E, and PICALM. We sought to measure the influence of GWAS single nucleotide polymorphisms (SNPs) and gene expression levels on clinical and pathological measures of AD in brain tissue from the parietal lobe of AD cases and age-matched, cognitively normal controls. We found that ABCA7, CD33, and CR1 expression levels were associated with clinical dementia rating (CDR), with higher expression being associated with more advanced cognitive decline. BIN1 expression levels were associated with disease progression, where higher expression was associated with a delayed age at onset. CD33, CLU, and CR1 expression levels were associated with disease status, where elevated expression levels were associated with AD. Additionally, MS4A6A expression levels were associated with Braak tangle and Braak plaque scores, with elevated expression levels being associated with more advanced brain pathology. We failed to detect an association between GWAS SNPs and gene expression levels in our brain series. The minor allele of rs3764650 in ABCA7 is associated with age at onset and disease duration, and the minor allele of rs670139 in MS4A6E was associated with Braak tangle and Braak plaque score. These findings suggest that expression of some GWAS genes, namely ABCA7, BIN1, CD33, CLU, CR1 and the MS4A family, are altered in AD brains.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Age
/ Alleles
/ Alzheimer Disease - genetics
/ Alzheimer Disease - pathology
/ ATP-Binding Cassette Transporters - genetics
/ Biology
/ Brain
/ Consent
/ Dementia
/ Etiology
/ Female
/ Genes
/ Genetic Predisposition to Disease
/ Genome-wide association studies
/ Genomes
/ Humans
/ Kinases
/ Male
/ Medicine
/ Membrane Proteins - genetics
/ Polymorphism, Single Nucleotide - genetics
/ Proteins
/ Single nucleotide polymorphisms
/ Single-nucleotide polymorphism
/ Values
