Gender-specific association of ADA genetic polymorphism with human longevity

Area of Science:

• Genetics
• Immunology
• Gerontology

Background:

• The Adenosine Deaminase (ADA) gene regulates adenosine levels, impacting immune function and metabolism.
• Genetic variations in ADA may influence human longevity and age-related disease susceptibility.

Purpose of the Study:

• To investigate the association between the polymorphic ADA gene and human longevity.
• To determine if ADA genotype influences lifespan in a sex- and age-specific manner.

Main Methods:

• Studied 884 healthy individuals (age 10-106) from central Italy.
• Performed ADA genotyping using RFLP-PCR.
• Analyzed genotype frequencies using chi-square and log-linear models.

Main Results:

• ADA influences human lifespan in a sex- and age-specific way.
• Increased ADA*2 allele frequency observed in males aged 80-85; decreased frequency in males over 85.
• Significant interaction found between age group, ADA genotype, and sex; negligible effect in females.

Conclusions:

• The ADA*2 allele may offer protection against ischemic stroke in males aged 80-85 due to higher adenosine levels.
• Reduced adenosine levels in older males might confer protection against pulmonary diseases and enhance anti-tumor immunity.
• Genetic factors related to ADA appear to have a marginal influence on longevity in females.