Human Molecular Genetics, Vol 7, 1511-1516, Copyright © 1998 by Oxford University Press
JC Lambert, C Berr, F Pasquier, A Delacourte, B Frigard, D Cottel, J Perez-Tur, V Mouroux, M Mohr, D Cecyre, D Galasko, C Lendon, J Poirier, J Hardy, D Mann, P Amouyel and MC Chartier-Harlin
Possession of the apolipoprotein E (APOE) epsilon4 allele is the most
frequently associated genetic susceptibility factor for Alzheimer's disease
(AD). Recently, new polymorphisms in the regulatory region of the APOE gene
have been described. We analysed the effects of three of these mutations
(-491 AT, -427 CT and Th1/E47cs) on disease risk in a large case-control
study, and tested their impacts on APOE allelic expression in brain
tissues. The Th1/E47cs T allele was associated with an increased risk of
occurrence of AD, while the -491 T allele was associated with a decreased
risk, independently of the APOE epsilon2/epsilon3/epsilon4 polymorphism
effect. However, the impact of the Th1/E47cs mutation was the strongest.
The -427 CT polymorphism was not associated with the disease. In AD
subjects heterozygous for the epsilon4 allele, analysis of allelic
expression showed that the relative expression levels of the epsilon4
allele were higher than those of the corresponding controls. Consistent
with epidemiological data, the relative level of expression of the epsilon4
allele was modified accordingly to the presence or absence of the two main
promoter polymorphisms, indicating, in vivo, the deleterious effect of the
Th1/E47cs T allele and the protective effect of the -491 T allele in
population. These data indicate that in addition to the qualitative effect
of the APOE epsilon2/epsilon3/epsilon4 polymorphisms on the AD occurrence,
the quantitative variation of expression of these alleles due to functional
APOE promoter mutations, is a key determinant of AD development.
ARTICLES
Pronounced impact of Th1/E47cs mutation compared with -491 AT mutation on neural APOE gene expression and risk of developing Alzheimer's disease
INSERM CJF95-05, Institut Pasteur de Lille, 1 rue du Professeur Calmette, BP 245, 59019 Lille Cedex, France.
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