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A genome-wide association study implicates the APOE locus in nonpathological cognitive ageing
G Davies1, S E Harris2, C A Reynolds3
1Department of Psychology, The University of Edinburgh, Edinburgh, UK.
Molecular Psychiatry
|December 5, 2012
Summary
Genetic factors influence cognitive aging. A specific gene region near TOMM40 and Apolipoprotein E (APOE) was significantly associated with cognitive aging in older adults. Further research is needed to clarify the exact causal variants and mechanisms.
Area of Science:
- Genetics
- Neuroscience
- Gerontology
Background:
- Cognitive decline is a significant concern in aging, impacting quality of life and independence.
- Understanding the genetic underpinnings of cognitive aging is crucial for developing targeted interventions.
- Previous research has implicated the Apolipoprotein E (APOE) gene in cognitive aging.
Purpose of the Study:
- To investigate the genetic contribution to individual differences in nonpathological cognitive aging.
- To identify specific genetic variants associated with cognitive aging using genome-wide association analysis.
- To replicate findings in independent cohorts and explore the functional effects of associated genetic regions.
Main Methods:
- Genome-wide association analysis (GWAS) of 549,692 single-nucleotide polymorphisms (SNPs) in 3511 unrelated older adults from the CAGES project.
- Phenotyping cognitive changes using detailed longitudinal cognitive data.
- Replication analysis in three independent Swedish cohorts and fine SNP mapping of the TOMM40/APOE region.
Main Results:
- A genome-wide significant association was found for SNP rs2075650 in the TOMM40 gene (P=2.5 × 10(-8)).
- The APOE haplotype showed a significant effect on cognitive aging, particularly in females.
- Fine mapping identified both APOE (rs429358) and TOMM40 (rs11556505) as associated loci, with APOE (rs429358) strongly suggested as the causal variant.
Conclusions:
- The APOE region is significantly associated with nonpathological cognitive aging.
- Functional genomic analysis suggests regulatory effects of SNPs in the TOMM40/APOE region.
- The precise identity and mechanism of the causal variants require further investigation.
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