Genetics of hypertriglyceridemia and atherosclerosis

Area of Science:

• Cardiovascular Medicine
• Genetics
• Lipid Metabolism

Background:

• The link between elevated triglyceride levels (hypertriglyceridemia) and atherosclerotic cardiovascular disease (ASCVD) risk is a long-standing area of research.
• Recent genetic studies, including Mendelian randomization, have aimed to establish a causal relationship.

Purpose of the Study:

• To review the current understanding of the relationship between triglyceride levels and ASCVD risk, particularly in light of recent genetic evidence.
• To explore the complexities and limitations of genetic studies in determining causality.

Main Methods:

• Review of recent genetic studies, focusing on Mendelian randomization.
• Analysis of potential confounding factors, including pleiotropic effects of other lipid variables (non-HDL cholesterol, apoB, HDL cholesterol) and non-lipid mechanisms (inflammation, coagulation).

Main Results:

• Genetic studies suggest an association between elevated triglycerides and ASCVD, potentially causal.
• Pleiotropic effects and unmeasured confounders limit the ability to confirm a direct causal role for triglycerides.
• Evidence suggests cholesterol within triglyceride-rich lipoproteins, not triglyceride content itself, may be a key driver of risk.

Conclusions:

• The precise mechanisms linking hypertriglyceridemia to ASCVD require further elucidation.
• Novel triglyceride-lowering therapies targeting proteins like apo C-III and ANGPTL3 are under investigation.
• The efficacy of these new therapies in reducing atherosclerotic risk remains to be proven.