A two-sample Mendelian randomization study of circulating lipids and deep venous thrombosis

Area of Science:

• Genetics
• Epidemiology
• Cardiovascular Science

Background:

• Observational studies suggest a link between circulating lipids and deep venous thrombosis (DVT).
• The causal relationship remains debated due to potential confounding factors in observational research.

Purpose of the Study:

• To investigate the causal effects of five key circulating lipids on DVT using a two-sample Mendelian randomization (MR) approach.
• To leverage genetic variants as instrumental variables for lipids to infer causality, overcoming limitations of observational studies.

Main Methods:

• A two-sample Mendelian randomization study design was employed.
• Genetic variants associated with five lipids (apolipoprotein A1, apolipoprotein B, LDL, HDL, triglycerides) were used as exposures.
• Deep venous thrombosis (DVT) served as the outcome, analyzed using inverse variance weighting and other MR methods.
• Sensitivity analyses including MR-Egger intercept, Cochran's Q test, and leave-one-out analysis were performed to assess robustness.

Main Results:

• The Mendelian randomization analysis did not reveal a statistically significant causal effect of the five common circulating lipids on deep venous thrombosis (DVT).
• Findings were inconsistent with some published observational studies, highlighting the importance of genetic approaches in causality assessment.
• Robustness checks confirmed the stability and reliability of the results.

Conclusions:

• This study provides genetic evidence suggesting that common circulating lipids do not have a causal impact on deep venous thrombosis (DVT).
• The findings underscore the utility of Mendelian randomization in distinguishing correlation from causation in complex diseases.
• Further research may explore other etiological factors contributing to DVT.