The bidirectional genetic causality between immunocyte phenotypes and dilated cardiomyopathy: A bidirectional...

Area of Science:

• Immunology
• Cardiovascular Genetics
• Mendelian Randomization

Background:

• The precise role of immune cell phenotypes in the pathogenesis of dilated cardiomyopathy (DCM) remains unclear.
• Understanding the bidirectional relationship between immune cells and DCM is crucial for elucidating disease mechanisms.

Purpose of the Study:

• To investigate the causal relationships between 731 immunocyte phenotypes and DCM using a bidirectional two-sample Mendelian randomization approach.
• To identify specific immune cell traits that influence DCM risk and progression.

Main Methods:

• Utilized genome-wide association study summary statistics from European ancestry populations for DCM cases and controls, and for immunocyte phenotypes.
• Employed multiple Mendelian randomization methods including inverse variance weighted, MR-Egger, and median estimators.
• Conducted sensitivity analyses to ensure the robustness of the findings.

Main Results:

• Identified 14 immunocyte phenotypes as risk factors and 15 as protective factors for DCM.
• Reverse Mendelian randomization indicated that DCM occurrence may increase 17 immunocyte phenotypes and decrease 9.
• Specifically, CD28 on secreting regulatory T cells was found to mitigate DCM, and DCM progression reduced CD28 levels.

Conclusions:

• Confirmed a bidirectional genetic relationship between immunocyte phenotypes and DCM.
• Highlighted the intricate interplay between the immune system and the development and progression of dilated cardiomyopathy.
• Suggests potential therapeutic targets within immune cell modulation for DCM management.