Association and causality between diabetes and activin A: a two-sample Mendelian randomization study.

Area of Science:

• Endocrinology
• Genetics
• Metabolic Disorders

Background:

• Activin A, a TGF-β superfamily cytokine, plays roles in development and metabolism.
• Conflicting evidence exists regarding plasma activin A levels in diabetic populations.
• Previous studies show inconsistent associations between activin A and diabetes.

Purpose of the Study:

• To investigate the causal relationship between diabetes (type 1 and type 2) and plasma activin A levels.
• To utilize Mendelian randomization analysis to assess causality.
• To clarify the potential association between diabetes and activin A.

Main Methods:

• Two-sample Mendelian randomization (TSMR) analysis using genome-wide association study data.
• Employed inverse-variance-weighted (IVW), Egger, weighted median, and weighted mode methods.
• Assessed causality between diabetes and plasma activin A, and vice versa.

Main Results:

• Single instrument Wald ratio estimates were predominantly non-significant.
• All applied MR methods (IVW, Egger, weighted median, weighted mode) showed no causal link between diabetes and plasma activin A.
• Lack of strong genetic instruments precluded reversal MR analysis.

Conclusions:

• Current TSMR analysis does not support a causal relationship between diabetes and plasma activin A.
• Further research is required to confirm or refute the association and understand temporal dynamics.
• The study highlights the need for robust genetic instruments in MR analyses for complex traits.