Bidirectional causal relationship between hypercholesterolemia and ischemic heart disease: a Mendelian randomization...

Area of Science:

• Cardiovascular Genetics
• Metabolic Disorders
• Epidemiology

Background:

• Ischemic heart disease (IHD) is a major global health concern.
• Hypercholesterolemia, characterized by high cholesterol levels, is linked to IHD.
• The precise causal relationship between hypercholesterolemia and IHD requires further elucidation.

Purpose of the Study:

• To investigate the bidirectional causal relationship between hypercholesterolemia and IHD using genetic evidence.
• To identify shared genetic factors contributing to both conditions.
• To explore potential therapeutic targets based on genetic insights.

Main Methods:

• A two-sample Mendelian randomization (MR) analysis was performed.
• Genetic variants associated with hypercholesterolemia and IHD were utilized.
• Multiple statistical methods (MR-Egger, IVW, Weighted Median) and sensitivity analyses were employed.
• Genetic co-localization analysis was conducted to identify shared genes.

Main Results:

• A significant bidirectional causal relationship was confirmed between hypercholesterolemia and IHD.
• Increased odds of IHD were associated with hypercholesterolemia (OR=2.27).
• Increased odds of hypercholesterolemia were associated with IHD (OR=1.80).
• Four genes (CELSR2, PCSK9, LPA, APOE) were identified as co-localized and potentially implicated in both conditions.

Conclusions:

• Mendelian randomization provides genetic evidence for a causal link between hypercholesterolemia and IHD.
• The findings support a bidirectional relationship, with IHD potentially influencing hypercholesterolemia.
• Co-localization analysis suggests shared genetic causal variants, offering targets for novel therapeutic strategies.