Decrease with age in frequency of the homozygous deletional angiotensin-converting enzyme genotype in hypertensive...

Area of Science:

• Cardiovascular Genetics
• Hypertension Research
• Molecular Epidemiology

Background:

• The Angiotensin-converting enzyme (ACE) gene influences cardiovascular risk.
• The homozygous deletional (DD) genotype of the ACE gene is associated with increased risk of myocardial infarction.
• Age-related changes in ACE genotype distribution may impact cardiovascular risk assessment.

Purpose of the Study:

• To investigate the relationship between ACE genotypes and cardiovascular risk in hypertensive patients.
• To determine if ACE genotype frequencies vary across different age groups.
• To explore the potential impact of ACE genotype on mortality risk in hypertension.

Main Methods:

• Genomic DNA was extracted from 223 subjects (hypertensive patients, ischemic heart disease patients, and controls).
• Polymerase chain reaction (PCR) was used to identify ACE insertion (I) or deletion (D) alleles.
• ACE genotype and allele frequencies were analyzed in three age strata: <50, 50-59, and ≥60 years.

Main Results:

• A significant correlation was observed between ACE genotype and age (P=0.03).
• The frequency of the D allele was similar in young (<50 years) hypertensive patients and controls (0.41 vs 0.40).
• In hypertensive patients aged 50 years and older, the D allele frequency was significantly lower compared to younger patients (0.22 vs 0.41; P=0.01).

Conclusions:

• The decreased frequency of the DD genotype in older hypertensive patients supports its association with increased cardiovascular risk.
• The findings suggest that the ACE DD genotype may contribute to a higher risk of premature death in the studied population.
• Age-specific analysis of ACE genotypes is crucial for understanding cardiovascular risk in hypertension.