ACE insertion/deletion, but not -240A>T polymorphism, modulates the severity in heart failure

Area of Science:

• Cardiovascular Genetics
• Molecular Cardiology
• Genetic Epidemiology

Background:

• The angiotensin-converting enzyme (ACE) gene is a key player in heart failure.
• The ACE insertion/deletion (I/D) polymorphism is a known predictor of mortality in heart failure.
• The role of the ACE -240A>T polymorphism in heart failure severity and outcomes remains unclear.

Purpose of the Study:

• To investigate the association between ACE I/D and -240A>T polymorphisms and heart failure severity.
• To determine if these ACE polymorphisms influence clinical outcomes in heart failure patients.
• To assess the predictive value of ACE polymorphisms according to New York Heart Association (NYHA) functional class.

Main Methods:

• Study included 323 heart failure patients (258 men/65 women, mean age 70.8 years).
• Patients were followed for an average of 11.9 months.
• ACE I/D and -240A>T polymorphisms were genotyped and analyzed in relation to NYHA class and clinical outcomes.

Main Results:

• ACE D and -240T allele frequencies significantly increased with higher NYHA functional classes (P = 0.0002 and P < 0.0001).
• The ACE D allele, but not the -240T allele, independently predicted severe heart failure (NYHA III and IV classes; P = 0.01 and P = 0.004).
• No significant differences in ACE allele frequencies were observed concerning death or rehospitalization, although ACE D allele prevalence was higher in these groups.

Conclusions:

• The ACE I/D polymorphism may predispose individuals to severe heart failure.
• This genetic variation appears to be an independent predictor of heart failure severity.
• Further research may clarify the role of ACE polymorphisms in heart failure prognosis.