Risk factors for atherosclerosis in twins

Area of Science:

• Human genetics
• Cardiovascular disease risk factors
• Twin studies

Background:

• Cardiovascular risk factors such as body mass index (BMI), lipid profiles (LDL, HDL), and blood pressure are influenced by a complex interplay of genetic and environmental factors.
• Twin studies are a powerful tool for dissecting the genetic and environmental contributions to complex traits and diseases.

Purpose of the Study:

• To investigate the multivariate genetic underpinnings of cardiovascular risk factors in female twins.
• To determine the extent to which genetic factors influencing BMI explain the correlations observed between lipid subfractions and blood pressure.

Main Methods:

• Multivariate genetic analyses were conducted on data from two independent cohorts of US and Australian female twins.
• Statistical models incorporating age as a covariate were fitted to data for body mass index (BMI), serum low-density lipoprotein (LDL), and high-density lipoprotein (HDL).

Main Results:

• The applied genetic models for BMI, LDL, and HDL, including age, were successfully fitted to both US and Australian twin datasets.
• Results indicated that BMI, or the genes contributing significantly to BMI variance, played a crucial role in explaining the correlations between different lipid subfractions.
• Furthermore, genetic factors related to BMI were found to explain correlations between blood pressure and lipid subfractions, particularly HDL.

Conclusions:

• Genetic factors influencing body mass index (BMI) are significant determinants of lipid profiles (LDL, HDL) and blood pressure.
• The findings highlight the central role of genetic influences on BMI in the covariation of key cardiovascular risk factors.