Shared genetic liability between major depressive disorder and osteoarthritis

Area of Science:

• Genetics
• Psychiatry
• Rheumatology

Background:

• Major depressive disorder (MDD) and osteoarthritis (OA) are common conditions with complex etiologies.
• Understanding shared biological mechanisms can improve treatment strategies for both MDD and OA.

Purpose of the Study:

• To investigate the genetic relationships and shared causal variants between MDD and OA.
• To identify potential therapeutic targets for both conditions based on genetic findings.

Main Methods:

• Linkage disequilibrium score regression to assess genetic correlation.
• Bidirectional Mendelian randomization to infer causality.
• Cross-trait meta-analysis and transcriptome-wide association fine-mapping to identify shared loci and genes.

Main Results:

• Significant genetic correlation (r_g = 0.29) found between MDD and OA.
• Evidence of bidirectional causal effects between genetic liability to MDD and OA.
• Identified 29 shared genomic loci and highlighted ESR1, SOX5, and GPX1 as potential therapeutic targets.

Conclusions:

• Substantial shared genetic liability exists between MDD and OA, indicating a potential for one to confer risk for the other.
• Findings offer novel insights into the phenotypic relationship between MDD and OA.
• Identified genes may represent future therapeutic avenues for managing both disorders.