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Alcohol consumption and lifetime change in cognitive ability: a gene × environment interaction study
Stuart J Ritchie1, Timothy C Bates, Janie Corley
1Department of Psychology, The University of Edinburgh, 7 George Square, Edinburgh, EH8 9JZ, UK, stuart.ritchie@ed.ac.uk.
Age (Dordrecht, Netherlands)
|March 22, 2014
Summary
Genetic differences in alcohol processing capacity influence how alcohol consumption affects long-term cognitive changes. Higher processing ability may lead to cognitive improvement, while lower ability is linked to decline with increased alcohol intake.
Area of Science:
- Neuroscience
- Genetics
- Epidemiology
Background:
- Alcohol consumption's impact on cognitive ability is complex and often confounded.
- Mendelian randomization offers a method to investigate causal relationships, mitigating confounding factors.
Purpose of the Study:
- To test if genetic predisposition for alcohol processing capacity moderates the relationship between alcohol intake and lifetime cognitive change.
- To explore the role of genetic variants in alcohol metabolism on cognitive trajectories.
Main Methods:
- Utilized a Mendelian randomization design with the Lothian Birth Cohort 1936.
- Assessed lifetime intelligence changes (age 11 to 70) and recent alcohol consumption.
- Genotyped participants for single-nucleotide polymorphisms in alcohol dehydrogenase genes.
Main Results:
- A significant gene-environment interaction between genetic alcohol processing capacity and alcohol consumption on cognitive change was observed (p=0.007).
- Individuals with higher genetic alcohol processing capacity showed cognitive improvement with increased consumption.
- Conversely, those with lower processing capacity experienced cognitive decline associated with higher alcohol consumption.
Conclusions:
- Genetic factors influencing alcohol metabolism play a crucial role in moderating the effects of alcohol consumption on cognitive aging.
- Individual genetic makeup can determine whether alcohol consumption is associated with cognitive stability, improvement, or decline over a lifetime.
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