Gene by neuroticism interaction and cognitive function among older adults

Area of Science:

• Neuroscience
• Genetics
• Psychology

Background:

• Apolipoprotein E (ApoE) ε-4 allele is linked to cognitive decline in older adults.
• Elevated neuroticism, a tendency to experience distress, is also associated with poorer cognitive function.
• The interplay between ApoE genotype and personality traits in cognitive aging is not fully understood.

Purpose of the Study:

• To investigate whether neuroticism moderates the association between ApoE genotype and cognitive function in older adults.
• To explore if other personality dimensions (openness, agreeableness, extraversion, conscientiousness) influence the ApoE-cognition relationship.

Main Methods:

• Study included 597 older adults (mean age 78 years) from the Ginkgo Evaluation of Memory study.
• Participants completed the NEO five-factor inventory for personality assessment.
• Cognitive function was measured using the Alzheimer's Disease Assessment Scale, and ApoE genotyping was performed.

Main Results:

• Neuroticism significantly moderated the relationship between ApoE ε-4 and cognitive function.
• Individuals with high neuroticism and the ApoE ε-4 allele showed significantly lower cognitive scores.
• Other personality dimensions showed minimal evidence of moderating the ApoE-cognition association.

Conclusions:

• Apolipoprotein E (ApoE) and neuroticism may interact to affect cognitive function in older adults.
• Further research is needed to elucidate the physiological mechanisms underlying this genotype-phenotype interaction.
• Studying genotype-phenotype interactions is crucial for understanding cognitive aging and developing prevention strategies.