Genetically Elevated Serum Uric Acid and Renal Function in an Apparently Healthy Population

Area of Science:

• Nephrology
• Genetics
• Metabolic Research

Background:

• The link between uric acid and kidney disease is well-established, with numerous studies observing associations between serum uric acid levels and renal function.
• However, observational studies cannot definitively establish causality due to potential confounding factors.

Purpose of the Study:

• To investigate a potential causal association between circulating uric acid levels and renal function using a Mendelian randomization approach.
• To assess the relationship between uric acid levels, estimated glomerular filtration rate (eGFR), and a specific uric acid polymorphism (rs11722228).

Main Methods:

• A Mendelian randomization study was conducted on 989 participants.
• Measurements included estimated glomerular filtration rate (eGFR), circulating uric acid levels, and genotyping for the uric acid polymorphism rs11722228.
• Statistical analyses adjusted for various cardiovascular risk factors and potential confounders.

Main Results:

• A significant association was found between the rs11722228 genotype and uric acid levels (p < 0.0001).
• Circulating uric acid levels were negatively correlated with eGFR (p < 0.0001) after adjusting for confounders.
• The rs11722228 genotype was also significantly associated with eGFR (β = -0.07; p = 0.02).

Conclusions:

• Mendelian randomization analysis provides evidence for a causal relationship between uric acid levels and renal function.
• These findings suggest that elevated uric acid may directly impact kidney function, even in apparently healthy individuals.