Promoter polymorphisms which modulate insulin degrading enzyme expression may increase susceptibility to Alzheimer's disease.

Abstract:

:Cerebral accumulation of amyloid beta protein (Abeta) is believed to play a central role in the pathogenesis of Alzheimer's disease (AD). Insulin degrading enzyme (IDE) is involved in Abeta degradation, therefore the gene encoding for insulin degrading enzyme is one of the candidate genes risky for AD. In Chinese Han populations we found three polymorphisms in IDE promoter: -1002T/G (rs3758505), -179T/C (rs4646953) and -51C/T (rs4646954). The -1002T and -51C alleles were over-represented in 357 sporadic AD (SAD) patients when compared to those in 331 healthy individuals. Furthermore, -1002T/G and -51C/T were in strong linkage disequilibrium and they constructed a relatively risky -1002T/-51C and a relatively protective -1002G/-51T. Luciferase reporter assay indicated -1002T/-51C had lower transcriptional activity than -1002G/-51T. A more marked increase in -1002T/-51C transcriptional activity was seen when under Abeta(25-35) and serum deprivation treatment. The present study provides evidence that IDE promoter polymorphisms that significantly decrease IDE expression levels are associated with development of SAD.

journal_name

Brain Res

journal_title

Brain research

authors

Zuo X,Jia J

doi

10.1016/j.brainres.2008.10.034

subject

Has Abstract

pub_date

2009-01-16 00:00:00

pages

1-8

eissn

0006-8993

issn

1872-6240

pii

S0006-8993(08)02563-8

journal_volume

1249

pub_type

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