A genome-wide association study implicates the APOE locus in nonpathological cognitive ageing.

Published

Journal Article

Cognitive decline is a feared aspect of growing old. It is a major contributor to lower quality of life and loss of independence in old age. We investigated the genetic contribution to individual differences in nonpathological cognitive ageing in five cohorts of older adults. We undertook a genome-wide association analysis using 549 692 single-nucleotide polymorphisms (SNPs) in 3511 unrelated adults in the Cognitive Ageing Genetics in England and Scotland (CAGES) project. These individuals have detailed longitudinal cognitive data from which phenotypes measuring each individual's cognitive changes were constructed. One SNP--rs2075650, located in TOMM40 (translocase of the outer mitochondrial membrane 40 homolog)--had a genome-wide significant association with cognitive ageing (P=2.5 × 10(-8)). This result was replicated in a meta-analysis of three independent Swedish cohorts (P=2.41 × 10(-6)). An Apolipoprotein E (APOE) haplotype (adjacent to TOMM40), previously associated with cognitive ageing, had a significant effect on cognitive ageing in the CAGES sample (P=2.18 × 10(-8); females, P=1.66 × 10(-11); males, P=0.01). Fine SNP mapping of the TOMM40/APOE region identified both APOE (rs429358; P=3.66 × 10(-11)) and TOMM40 (rs11556505; P=2.45 × 10(-8)) as loci that were associated with cognitive ageing. Imputation and conditional analyses in the discovery and replication cohorts strongly suggest that this effect is due to APOE (rs429358). Functional genomic analysis indicated that SNPs in the TOMM40/APOE region have a functional, regulatory non-protein-coding effect. The APOE region is significantly associated with nonpathological cognitive ageing. The identity and mechanism of one or multiple causal variants remain unclear.

Full Text

Duke Authors

Cited Authors

  • Davies, G; Harris, SE; Reynolds, CA; Payton, A; Knight, HM; Liewald, DC; Lopez, LM; Luciano, M; Gow, AJ; Corley, J; Henderson, R; Murray, C; Pattie, A; Fox, HC; Redmond, P; Lutz, MW; Chiba-Falek, O; Linnertz, C; Saith, S; Haggarty, P; McNeill, G; Ke, X; Ollier, W; Horan, M; Roses, AD; Ponting, CP; Porteous, DJ; Tenesa, A; Pickles, A; Starr, JM; Whalley, LJ; Pedersen, NL; Pendleton, N; Visscher, PM; Deary, IJ

Published Date

  • January 2014

Published In

Volume / Issue

  • 19 / 1

Start / End Page

  • 76 - 87

PubMed ID

  • 23207651

Pubmed Central ID

  • 23207651

Electronic International Standard Serial Number (EISSN)

  • 1476-5578

International Standard Serial Number (ISSN)

  • 1359-4184

Digital Object Identifier (DOI)

  • 10.1038/mp.2012.159

Language

  • eng