Causality between urate levels with sarcopenia-related traits: a bi-directional Mendelian randomization study

Area of Science:

• Genetics
• Metabolic Health
• Aging Research

Background:

• Observational studies suggest a link between serum urate and sarcopenia, but causality is unclear.
• Reverse causality and confounding factors limit observational findings.

Purpose of the Study:

• To investigate the causal relationship between serum urate levels and sarcopenia-related traits.
• Utilized a bidirectional two-sample Mendelian randomization (MR) approach to assess causality.

Main Methods:

• Employed MR analysis with IVW, weighted median, and MR-Egger methods.
• Utilized large-scale summary statistics from CKDGen and UK Biobank for serum urate, grip strength, lean mass, and walking pace.
• Conducted sensitivity analyses including Cochran's Q test and leave-one-out analysis to ensure robustness.

Main Results:

• Serum urate levels showed no causal association with sarcopenia-related traits (grip strength, lean mass) via IVW estimates.
• An inverse correlation was observed between walking pace and serum urate levels in the inverse MR analysis.
• Sensitivity analyses confirmed the robustness of these findings.

Conclusions:

• The MR study found no bidirectional causal relationship between serum urate levels and sarcopenia.
• Acknowledged that age and health status are important factors not examined in this study.
• Recommended future research to explore these complex interactions.