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Human Molecular Genetics, Vol 7, 1953-1956, Copyright © 1998 by Oxford University Press

ARTICLES

Genetic association of an alpha2-macroglobulin (Val1000lle) polymorphism and Alzheimer's disease

A Liao, RM Nitsch, SM Greenberg, U Finckh, D Blacker, M Albert, GW Rebeck, T Gomez-Isla, A Clatworthy, G Binetti, C Hock, T Mueller-Thomsen, U Mann, K Zuchowski, U Beisiegel, H Staehelin, JH Growdon, RE Tanzi and BT Hyman
Alzheimer Research Unit, Neurology Service, Massachusetts General Hospital, 149 13th Street (CNY 6405), Charlestown, MA 02129, USA.

alpha2-Macroglobulin (A2M) is a proteinase inhibitor found in association with senile plaques (SP) in Alzheimer's disease (AD). A2M has been implicated biochemically in binding and degradation of the amyloid beta (Abeta) protein which accumulates in SP. We studied the relationship between Alzheimer's disease and a common A2M polymorphism, Val1000 (GTC)/Ile1000 (ATC), which occurs near the thiolester active site of the molecule. In an initial exploratory data set (90 controls and 171 Alzheimer's disease) we noted an increased frequency of the G/G genotype from 0.07 to 0.12. We therefore tested the hypothesis that the G/G genotype is over-represented in Alzheimer's disease in an additional independent data set: a group of 359 controls and 566 Alzheimer's disease patients. In the hypothesis testing cohort, the G/G genotype increased from 0.07 in controls to 0.12 in Alzheimer's disease (P < 0.05, Fisher's exact test). The odds ratio for Alzheimer's disease associated with the G/G genotype was 1.77 (1.16-2.70, P < 0.01) and in combination with APOE4 was 9.68 (95% CI 3.91-24.0, P < 0.001). The presence of the G allele was associated with an increase in Abeta burden in a small series. The A2M receptor, A2M-r/LRP, is a multifunctional receptor whose ligands include apolipoprotein E and the amyloid precursor protein. These four proteins have each been genetically linked to Alzheimer's disease, suggesting that they may participate in a common disease pathway.
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