Causal relationship between depression and hypercholesterolemia: A bidirectional 2-sample Mendelian randomization...

Area of Science:

• Genetics
• Psychiatry
• Cardiovascular Health

Background:

• Observational studies show mixed associations between depression and hypercholesterolemia.
• Previous research lacks definitive causal evidence for the link between these conditions.

Purpose of the Study:

• To investigate the causal relationship between depression and hypercholesterolemia using a bidirectional Mendelian randomization approach.
• To determine if depression increases the risk of hypercholesterolemia, or if hypercholesterolemia leads to depression.

Main Methods:

• Employed a bidirectional 2-sample Mendelian randomization (MR) analysis with large-scale genome-wide association studies (GWAS) data.
• Utilized inverse variance weighted (IVW), MR-Egger regression, and other MR methods for robust analysis.
• Validated findings using multiple large GWAS datasets for hypercholesterolemia and performed sensitivity analyses.

Main Results:

• Depression significantly increases the risk of hypercholesterolemia by 31% (OR=1.31).
• This causal effect remained significant after adjusting for smoking, physical activity, and obesity.
• No evidence was found for a causal effect of hypercholesterolemia on depression.

Conclusions:

• Depression has a direct causal effect on the risk of developing hypercholesterolemia.
• Findings enhance understanding of the depression-hypercholesterolemia link, aiding in prevention and treatment.
• The study provides strong genetic evidence supporting a unidirectional causal relationship.