title: Genetic variants associated with risk of Alzheimer's disease contribute to cognitive change in midlife: The Atherosclerosis Risk in Communities Study.
abstract: Alzheimer's disease (AD) is the most common form of dementia and is characterized by impairment in memory, behavioral changes, and gradual loss of autonomy. Since there is a long latent period prior to diagnosis, the aim of this study was to determine whether twenty single nucleotide polymorphisms identified in genome-wide association analyses of AD are associated with cognitive change in 8,320 white and 2,039 African-American middle-aged adults enrolled in the prospective Atherosclerosis Risk in Communities (ARIC) study. Cognition was evaluated using the Delayed Word Recall Test (DWRT; verbal memory), Digit Symbol Substitution Test (DSST; processing speed), and Word Fluency Test (WFT; executive function). General linear models were used to assess mean differences in 6-year change in test scores among individuals categorized by genotype after adjusting for age, gender, and years of education. Addition of the minor allele for rs670139 (MS4A4E), rs9331896 (CLU), and rs12155159 (NME8) was nominally associated with change on the DWRT, DSST, and WFT, respectively, in whites. The ZCWPW1 (rs1476679) and CDS33 (rs3865444) variants were nominally associated with change on the DWRT and WFT in African-Americans. For rs670139 and rs9331896 the association was only significant in individuals bearing at least one APOE ϵ4 allele in stratified analyses. An unweighted genetic risk score aggregating the risk alleles for 15 polymorphisms was not associated with change in cognitive function. Although the AD-associated genetic variants appear to have small effects on early cognitive change, replication will be required to establish whether there is a discernible influence on cognitive status in midlife. © 2016 Wiley Periodicals, Inc.
authors: Human Genetics Center, School of Public Health, University of Texas Health Science Center at Houston, Houston, Texas.
authors: Jan
authors: J
authors: Bressler
authors: Division of Geriatrics, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi.
authors: Thomas H
authors: TH
authors: Mosley
authors: Division of Geriatrics, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi.
authors: Alan
authors: A
authors: Penman
authors: Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland.
authors: Rebecca F
authors: RF
authors: Gottesman
authors: Division of Geriatrics, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi.
authors: Beverly Gwen
authors: BG
authors: Windham
authors: Department of Neurology, Mayo Clinic, Rochester, Minnesota.
authors: David S
authors: DS
authors: Knopman
authors: Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina.
authors: Lisa M
authors: LM
authors: Wruck
authors: Human Genetics Center, School of Public Health, University of Texas Health Science Center at Houston, Houston, Texas.|Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas.
authors: Eric
authors: E
authors: Boerwinkle
mesh_terms: D001741:Black or African American / Q000235:genetics; D000483:Alleles; D000544:Alzheimer Disease / Q000150:complications / Q000235:genetics*; D050197:Atherosclerosis / Q000150:complications / Q000235:genetics / Q000523:psychology; D044383:Black People / Q000235:genetics; D051152:Clusterin / Q000235:genetics; D003071:Cognition; D003072:Cognition Disorders / Q000235:genetics; D003704:Dementia / Q000235:genetics; D005260:Female; D014644:Genetic Variation / Q000235:genetics; D055106:Genome-Wide Association Study / Q000379:methods; D006801:Humans; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D008568:Memory; D008875:Middle Aged; D009483:Neuropsychological Tests; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D011446:Prospective Studies; D012307:Risk Factors; D013879:Thioredoxins / Q000235:genetics; D044465:White People / Q000235:genetics
chemical_list: C495242:CLU protein, human; D051152:Clusterin; C436715:MS4A4E protein, human; D008565:Membrane Proteins; C452260:NME8 protein, human; D013879:Thioredoxins
keywords: Alzheimer's disease; association study; cognition; genetic epidemiology