title: The --491 TT apolipoprotein E promoter polymorphism is associated with reduced risk for sporadic Alzheimer's disease.
abstract: Homozygosity for the A allele of the -491 A/T apolipoprotein E (APOE) promoter polymorphism has recently been reported to be associated with sporadic Alzheimer's disease (AD). Two hundred and fifty one patients with AD and an equal number of controls derived from the same region in a Spanish population, were genotyped for -491 A/T and epsilon2/epsilon3/epsilon4 APOE polymorphisms. We did not detect an elevated -491 AA genotype frequency when comparing AD cases to controls. In contrast, persons homozygous for the T allele were at a significantly reduced risk of AD (odds ratio of 0.10, P=0.006). Multiple logistic regression analysis indicated that the -491 TT polymorphism added information on the risk of AD which was independent of that of the APOE epsilon4 allele.
authors.affiliation: Service of Neurology, University Hospital Marqués de Valdecilla, 39008 Santander, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Alvarez-Arcaya
authors.forename: O
authors.initials: O
authors.lastname: Combarros
authors.forename: J
authors.initials: J
authors.lastname: Llorca
authors.forename: M
authors.initials: M
authors.lastname: Sánchez-Guerra
authors.forename: J
authors.initials: J
authors.lastname: Berciano
authors.forename: J L
authors.initials: JL
authors.lastname: Fernández-Luna
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D000544:Alzheimer Disease / Q000235:genetics*; D001057:Apolipoproteins E / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006720:Homozygote; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D011110:Polymorphism, Genetic / Q000502:physiology*; D011401:Promoter Regions, Genetic / Q000235:genetics*; D012016:Reference Values
chemical_list: D001057:Apolipoproteins E