Genetic variation in apolipoprotein D and Alzheimer's disease.
Apolipoprotein D (apoD) is a lipoprotein-associated glycoprotein, structurally unrelated to apoE, that transports small hydrophobic ligands including cholesterol and sterols. Levels are increased in the hippocampus and CSF of Alzheimer's disease (AD) patients. We tested whether variation in the APOD gene affects AD risk. Four single nucleotide polymorphisms (SNPs) were investigated (in map order): exon 2, 15T-->C encodes an amino acid substitution Phe-->Ser at codon 15; intron 2, -352G-->A; intron 3, +45C-->T; intron 4, +718C-->T, determined by SNaPshot assay. SNP frequencies for 394 eastern Finnish AD patients were compared with those found for 470 control subjects, dividing subjects also into early-onset AD (EOAD; < or = 65 years) and late-onset AD (LOAD; >65 years) groups. The -352G allele was associated with a significant 3-fold increase in the risk of EOAD (OR: 2.7; 95% CI: 1.1-6.5). The -352G containing haplotypes were more common for EOAD cases (TGCC: 0.48 vs 0.41; TGCT: 0.08 vs 0.01 (p = 0.002). In the Grade-of-membership analysis, APOD genotype frequencies at each SNP site and disease status were used to construct two latent groups: the affected group carried -352 as GG or GA and +45 CC, was often women and enriched in APOE epsilon4. Each method suggested that the -352G allele frequency is higher for EOAD in the eastern Finnish population.
Helisalmi
Seppo
S
Dept. of Neuroscience & Neurology, University Hospital and University of Kuopio, Kuopio, Finland. seppo.helisalmi@uku.fi
Hiltunen
Mikko
M
Vepsäläinen
Saila
S
Iivonen
Susan
S
Corder
Elizabeth H
EH
Lehtovirta
Maarit
M
Mannermaa
Arto
A
Koivisto
Anne Maria
AM
Soininen
Hilkka
H
D017668:Age of Onset; D000368:Aged; D000409:Alanine / Q000235:genetics; D000544:Alzheimer Disease / Q000235:genetics*; D001053:Apolipoproteins / Q000235:genetics*; D053399:Apolipoproteins D; D016022:Case-Control Studies; D003545:Cysteine / Q000235:genetics; D005260:Female; D005387:Finland / Q000453:epidemiology; D005787:Gene Frequency; D014644:Genetic Variation; D005838:Genotype; D005998:Glycine / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D013912:Threonine / Q000235:genetics
D001053:Apolipoproteins; D053399:Apolipoproteins D; D013912:Threonine; D003545:Cysteine; D000409:Alanine; D005998:Glycine