Mitochondrial Gene Regulation and Pain Susceptibility: A Multi-Omics Causal Inference Study

Area of Science:

• Genetics
• Molecular Biology
• Pain Research

Background:

• The role of mitochondrial genes in common pain conditions is not well understood.
• Investigating genetic links between mitochondrial function and pain is crucial for understanding pain mechanisms.

Purpose of the Study:

• To explore the causal relationships between mitochondrial genes and seven common pain phenotypes.
• To identify specific mitochondrial genes and pathways involved in pain development and regulation.

Main Methods:

• Utilized a multi-omics Steiger-regression (SMR) method.
• Integrated quantitative trait loci (QTL) data for mitochondrial genes (expression, methylation, protein) with genome-wide association study (GWAS) data for pain phenotypes.

Main Results:

• Identified 18 candidate mitochondrial genes associated with pain phenotypes.
• Found strong evidence for a shared causal variant at the methylation level for the MCL1 gene in hip pain (PP.H4 = 0.962).
• Genetically predicted higher protein levels of Glycine amidinotransferase (GATM) were associated with reduced risk for neck/shoulder, back, and knee pain.

Conclusions:

• Mitochondrial gene regulation plays a significant role in common pain phenotypes.
• The GATM pathway demonstrates a protective effect against pain.
• MCL1 gene methylation is a potential causal factor in hip pain, warranting further investigation.