Abstract
Background: Coronary artery disease (CAD) is associated with cognitive decrements and risk of later dementia, but it is not known if shared genetic factors underlie this association. We tested whether polygenic risk for CAD was associated with cognitive ability in community-dwelling cohorts of middle-aged and older adults. Methods: Individuals from Generation Scotland: Scottish Family Health Study (GS:SFHS, N = 9865) and from the Lothian Birth Cohorts of 1921 (LBC1921, N = 517) and 1936 (LBC1936, N = 1005) provided cognitive data and genome-wide genotype data. Polygenic risk profile scores for CAD were calculated for all of the cohorts using the largest available genome-wide association studies (GWAS) data set, the CARDIoGRAM consortium (22 233 cases and 64 762 controls). Polygenic risk profile scores for CAD were then tested for their association with cognitive abilities in the presence and absence of manifest cardiovascular disease. Results: A meta-analysis of all three cohorts showed a negative association between CAD polygenic risk and fluid cognitive ability (β = −0.022, P = 0.016), verbal intelligence (β = −0.024, P = 0.011) and memory (β = −0.021, P = 0.028). Conclusions: Increased polygenic risk for CAD is associated with lower cognitive ability in older adults. Common genetic variants may underlie some of the association between age-related cognitive decrements and the risk for CAD.
Highlights
Age-related cognitive decline is an important aspect of health in older people
Based on single nucleotide polymorphism (SNP) associations from a large genome-wide association studies (GWAS) study of Coronary artery disease (CAD), PGRS were created for CAD in the three independent cohorts measuring cognition in middle to old age
CAD PGRS was associated with cardiovascular disease (CVD) history at all SNP thresholds in a meta-analysis of all three cohorts
Summary
Age-related cognitive decline is an important aspect of health in older people. Accelerated cognitive ageing is associated with greater mortality and morbidity, less independence, lower quality of life and increased dementia risk.[1]. Some cognitive abilities decline on average as people grow older, including aspects of memory, speed of thinking and abstract reasoning.[1] Age-related cognitive decline shows substantial variation in the population[3,4] and this has spurred attempts to discover the factors influencing cognitive abilities in later life. We tested whether polygenic risk for CAD was associated with cognitive ability in community-dwelling cohorts of middle-aged and older adults. Polygenic risk profile scores for CAD were calculated for all of the cohorts using the largest available genome-wide association studies (GWAS) data set, the CARDIoGRAM consortium (22 233 cases and 64 762 controls). Conclusions: Increased polygenic risk for CAD is associated with lower cognitive ability in older adults.
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