Genetic variants of ABCA1 modify Alzheimer disease risk and quantitative traits related to beta-amyloid metabolism - PubMed (original) (raw)
Katy Chalmers, Juni Palmgren, Niels Andreasen, Boo Johansson, Nigel J Cairns, Margaret Gatz, Gordon K Wilcock, Seth Love, Nancy L Pedersen, Anthony J Brookes, Kaj Blennow, Patrick G Kehoe, Jonathan A Prince
Affiliations
- PMID: 15024730
- DOI: 10.1002/humu.20012
Genetic variants of ABCA1 modify Alzheimer disease risk and quantitative traits related to beta-amyloid metabolism
Hagit Katzov et al. Hum Mutat. 2004 Apr.
Abstract
Linkage studies have provided evidence that one or more loci on chromosome 9q influence Alzheimer disease (AD). The gene encoding the ATP-binding cassette A1 transporter (ABCA1) resides within proximity of previously identified linkage peaks and represents a plausible biological candidate for AD due to its central role in cellular lipid homeostasis. Several single nucleotide polymorphisms (SNPs) spanning ABCA1 have been genotyped and haplotype-based association analyses performed in four independent case-control samples, consisting of over 1,750 individuals from three European populations representing both early and late-onset AD. Prominent effects were observed for a common (H2) and rarer haplotype (H5) that were enriched in AD cases across studied populations (odds ratio [OR] 1.59, 95% confidence interval [CI] 1.36-1.82; P<0.00001 and OR 2.90; 95% CI 2.54-3.27; P<0.00001, respectively). Two other common haplotypes in the studied region (H1 and H3) were significantly under-represented in AD cases, suggesting that they may harbor alleles that decrease disease risk (OR 0.79, 95% CI 0.64-0.94; P=0.0065 and OR 0.70, 95% CI 0.46-0.93; P=0.011, respectively). While findings were significant in both early and late-onset samples, haplotype effects were more distinct in early-onset materials. For late-onset samples, ancillary evidence was obtained that both single marker alleles and haplotypes of ABCA1 contribute to variable cerebrospinal fluid tau and beta amyloid (Abeta42) protein levels, and brain Abeta load. Results indicate that variants of ABCA1 may affect the risk of AD, providing further support for a genetic link between AD and cholesterol metabolism.
Copyright 2004 Wiley-Liss, Inc.
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