Causal association between multiple sclerosis and trigeminal neuralgia: A Mendelian randomization study with...

Area of Science:

• Neuroscience
• Genetics
• Epidemiology

Background:

• Multiple sclerosis (MS) is a chronic autoimmune disease affecting the central nervous system.
• Trigeminal neuralgia (TN) is a neuropathic pain disorder characterized by severe facial pain.
• The etiological relationship between MS and TN requires further elucidation.

Purpose of the Study:

• To investigate the potential causal relationship between multiple sclerosis and trigeminal neuralgia.
• To leverage Mendelian randomization to assess genetic predisposition to MS as a risk factor for TN.

Main Methods:

• A two-sample Mendelian randomization (MR) meta-analysis was performed using genetic summary data.
• Eight MS genome-wide association studies (GWAS) served as exposures, and one TN GWAS as the outcome.
• Ten MR methods, including inverse-variance weighted (IVW) and MR-Egger regression, were utilized.

Main Results:

• Seven of eight MS exposure datasets demonstrated a positive causal association with TN.
• The meta-analysis indicated that MS significantly increases TN risk by 11% (IVW: 95% CI = 1.05-1.16; P < 0.001).
• Sensitivity analyses confirmed the robustness of findings, showing no significant pleiotropy or heterogeneity.

Conclusions:

• Genetic predisposition to multiple sclerosis is a causal factor for developing trigeminal neuralgia.
• These findings highlight a significant etiological link between MS and TN.
• Further research into biological pathways and diverse population validation is warranted.