The APOE gene and differences in life expectancy in Europe

Area of Science:

• Genetics
• Epidemiology
• Demography

Background:

• Common apolipoprotein-E (APOE) gene alleles are linked to chronic disease risks in European populations.
• Significant variations in APOE allele frequencies exist across European countries.

Purpose of the Study:

• To quantify the impact of differing APOE allele frequencies on mortality and life span variations across Europe.
• To determine the proportion of demographic differences attributable to APOE genotype distributions.

Main Methods:

• Utilized mortality data stratified by age, sex, and APOE genotype for Denmark, Finland, France, Italy, the Netherlands, and Sweden.
• Standardized mortality rates to Italian APOE allele frequencies to enable cross-country comparisons.
• Calculated the percentage of variation in mortality and life span explained by APOE allele frequency differences.

Main Results:

• Differences in APOE allele frequencies accounted for 12%-17% of the variation in mortality among individuals over 65 years old across the studied European countries.
• APOE allele frequency variations explained 1%-2% of the differences in life span for individuals older than 65.
• Genotype-specific mortality differences contributed approximately 3.5% to the genetic variation in life span in Denmark for individuals over 15 years old.

Conclusions:

• APOE allele frequencies represent a notable, quantifiable factor influencing mortality and life span disparities in European populations.
• The genetic landscape of APOE contributes to observed demographic variations in health outcomes across Europe.
• Further research into genotype-environment interactions is warranted to fully understand life span determinants.