Deciphering the Relationship Between Circulating Metabolites and Osteoarthritis: A Comprehensive Genetic Correlation...

Area of Science:

• Genetics
• Metabolomics
• Epidemiology

Background:

• The causal relationship between blood metabolites and osteoarthritis (OA) requires further investigation.
• Existing research has not definitively established the specific roles of various metabolites in OA pathogenesis.

Purpose of the Study:

• To investigate the genetic correlations between circulating metabolites and multiple OA phenotypes.
• To explore the potential causal associations between blood metabolites and OA using a bidirectional Mendelian randomization approach.

Main Methods:

• Utilized genome-wide association study (GWAS) summary data for 233 metabolites and 11 OA phenotypes across European and Asian populations.
• Employed linkage disequilibrium score (LDSC) regression for genetic correlation analysis.
• Performed two-sample bidirectional Mendelian randomization (MR) to infer causal relationships.

Main Results:

• Significant genetic correlations were observed between metabolic traits and several OA phenotypes, including All OA, Knee/Hip OA, Knee OA, and Spine OA.
• Lactate levels were associated with increased odds of multiple OA types (e.g., All OA, Hip OA, Knee OA).
• Conjugated linoleic acid ratios and glycerol levels also demonstrated significant associations with various OA phenotypes, suggesting potential causal links.

Conclusions:

• This study provides evidence for genetic and causal connections between specific blood metabolites and OA.
• Findings highlight potential therapeutic targets within metabolic pathways for OA management.
• Further research is warranted to elucidate the precise mechanisms underlying these metabolite-OA associations.