Two loci affect angiotensin I-converting enzyme activity in baboons

Area of Science:

• Genetics
• Cardiovascular Disease Research
• Biochemistry

Background:

• Serum low-density lipoprotein cholesterol (LDLC) and Angiotensin-Converting Enzyme (ACE) activity are implicated as cardiovascular disease (CVD) risk factors.
• The precise relationship between ACE and CVD susceptibility, along with its underlying mechanisms, remains a subject of scientific debate.

Purpose of the Study:

• To investigate the heritability of ACE activity and its genetic correlation with LDLC concentrations in baboons.
• To identify genetic loci influencing ACE activity and explore their potential pleiotropic effects on diet-induced LDLC response.

Main Methods:

• Statistical genetic methods were applied to data from 622 pedigreed baboons.
• Quantitative trait linkage (QTL) analyses were performed to map loci for ACE activity.
• Bivariate genetic analyses examined the genetic correlation between ACE activity and LDLC response to different diets.

Main Results:

• ACE activity demonstrated moderate heritability in the baboon population.
• A significant QTL for ACE activity was detected on the baboon chromosome 17 homolog.
• ACE activity was genetically correlated with LDLC response to a high-cholesterol diet, but not to a basal diet.
• A previously identified QTL for LDLC response exhibited pleiotropic effects on ACE activity, explaining the observed genetic correlation.

Conclusions:

• Two putative genetic loci influencing ACE activity in baboons were identified.
• One of these loci also impacts dietary response of LDLC, suggesting a gene-environment interaction.
• The existence of multiple, potentially diet-responsive genes affecting ACE activity may reconcile inconsistencies in previous CVD-related studies.