APOE Alleles and Extreme Human Longevity.

Area of Science:

• Genetics
• Gerontology
• Epidemiology

Background:

• The apolipoprotein E (APOE) gene is crucial in lipid metabolism and has been implicated in aging and age-related diseases.
• Understanding the role of APOE alleles in extreme human longevity is vital for identifying genetic factors contributing to healthy aging.

Purpose of the Study:

• To investigate the association between APOE alleles (ε2, ε3, ε4) and extreme human longevity.
• To determine the impact of APOE genotypes on age at death in a large, multi-study cohort.

Main Methods:

• Meta-analysis of seven large-scale studies including 28,297 participants.
• Utilized three genetic models and two definitions of extreme longevity (threshold and age at death).
• Examined the APOE ε2ε3 and ε4 alleles in relation to reaching extreme old age.

Main Results:

• The APOE ε4 allele was significantly associated with decreased odds of extreme longevity and increased mortality risk, even at advanced ages.
• Carrying the APOE ε2ε2 or ε2ε3 genotype was linked to significantly increased odds of reaching extreme longevity.
• Individuals with ε2 genotypes showed a reduced risk of death compared to ε3ε3, with a modest effect beyond the 99th percentile of age at death.

Conclusions:

• APOE genotype plays a significant role in determining extreme human longevity.
• The APOE ε4 allele acts as a risk factor for mortality, while the ε2 allele confers a longevity advantage.
• Findings highlight the genetic influence of APOE on lifespan and healthy aging trajectories.