Fine mapping of genetic variants in BIN1, CLU, CR1 and PICALM for association with cerebrospinal fluid biomarkers for Alzheimer's disease.

Document Type

Article

Abstract

Recent genome-wide association studies of Alzheimer's disease (AD) have identified variants in BIN1, CLU, CR1 and PICALM that show replicable association with risk for disease. We have thoroughly sampled common variation in these genes, genotyping 355 variants in over 600 individuals for whom measurements of two AD biomarkers, cerebrospinal fluid (CSF) 42 amino acid amyloid beta fragments (Aβ(42)) and tau phosphorylated at threonine 181 (ptau(181)), have been obtained. Association analyses were performed to determine whether variants in BIN1, CLU, CR1 or PICALM are associated with changes in the CSF levels of these biomarkers. Despite adequate power to detect effects as small as a 1.05 fold difference, we have failed to detect evidence for association between SNPs in these genes and CSF Aβ(42) or ptau(181) levels in our sample. Our results suggest that these variants do not affect risk via a mechanism that results in a strong additive effect on CSF levels of Aβ(42) or ptau(181).

Medical Subject Headings

Adaptor Proteins, Signal Transducing; Aged; Aged, 80 and over; Alzheimer Disease; Amyloid beta-Peptides; Biomarkers; Clusterin; Female; Genetic Predisposition to Disease; Humans; Male; Middle Aged; Monomeric Clathrin Assembly Proteins; Nuclear Proteins; Peptide Fragments; Phosphorylation; Polymorphism, Single Nucleotide; Receptors, Complement 3b; Serine; Tumor Suppressor Proteins; tau Proteins

Publication Date

2-9-2011

Publication Title

PLoS One

ISSN

1932-6203

Volume

6

Issue

2

First Page

15918

Last Page

15918

PubMed ID

21347408

Digital Object Identifier (DOI)

10.1371/journal.pone.0015918

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