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

Abstract:

: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.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Liao A,Nitsch RM,Greenberg SM,Finckh U,Blacker D,Albert M,Rebeck GW,Gomez-Isla T,Clatworthy A,Binetti G,Hock C,Mueller-Thomsen T,Mann U,Zuchowski K,Beisiegel U,Staehelin H,Growdon JH,Tanzi RE,Hyman BT

doi

10.1093/hmg/7.12.1953

subject

Has Abstract

pub_date

1998-11-01 00:00:00

pages

1953-6

issue

12

eissn

0964-6906

issn

1460-2083

pii

ddb240

journal_volume

7

pub_type

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