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Serum uric acid and adiposity: deciphering causality using a bidirectional Mendelian randomization approach.

Tanica Lyngdoh¹, Philippe Vuistiner, Pedro Marques-Vidal

¹Institute of Social and Preventive Medicine (IUMSP), Lausanne University Hospital, Lausanne, Switzerland.

|June 23, 2012

Summary

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Genome-wide Association Studies-GWAS

Genome-wide Association Studies-GWAS

Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...

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This study investigated the causal link between serum uric acid (SUA) and adiposity. Findings suggest elevated SUA is a consequence, not a cause, of increased body fat, using Mendelian randomization in Caucasians.

Area of Science:

Genetics
Metabolic Health
Epidemiology

Background:

The causal relationship between serum uric acid (SUA) and adiposity remains unclear despite established associations.
Conflicting evidence necessitates robust methods to determine the direction of causality.

Purpose of the Study:

To investigate the causal direction between SUA and adiposity using a bidirectional Mendelian randomization approach.
To clarify whether elevated SUA causes adiposity or vice versa.

Main Methods:

Employed a bidirectional Mendelian randomization design in a population-based cohort of adult Caucasians.
Utilized genetic variants (SNPs) in SUA (SLC2A9) and adiposity genes (FTO, MC4R, TMEM18) as instrumental variables.
Applied two-stage least squares regression to analyze associations between genetically predicted SUA and adiposity markers (weight, BMI, waist circumference, fat mass).

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Main Results:

Genetically predicted SUA, using SLC2A9 variants, showed no significant association with fat mass.
Conversely, genetically predicted fat mass, influenced by FTO, MC4R, and TMEM18 variants, was positively associated with SUA.
Similar patterns were observed for other adiposity markers, aligning with observational estimates.

Conclusions:

Findings from this bidirectional Mendelian randomization study indicate that elevated serum uric acid is likely a consequence of adiposity.
The results suggest that adiposity precedes and potentially influences SUA levels, rather than the reverse.