Genetic Association Between Hypothyroidism and the Risk of Trigeminal Neuralgia: A Two-Sample Mendelian Randomisation...

Area of Science:

• Genetics and Epidemiology
• Neurology

Background:

• Hypothyroidism is a common endocrine disorder.
• Trigeminal neuralgia (TN) is a debilitating neuropathic facial pain condition.
• The potential causal link between hypothyroidism and TN requires further investigation.

Purpose of the Study:

• To investigate the potential causal relationship between hypothyroidism and trigeminal neuralgia (TN) using Mendelian randomization (MR).

Main Methods:

• An analytical study utilizing genetic data from genome-wide association studies (GWAS).
• Fifty hypothyroidism-related single nucleotide polymorphisms (SNPs) served as instrumental variables (IVs).
• Inverse variance weighted (IVW) method was the primary analysis tool, supported by other MR methods and sensitivity analyses.

Main Results:

• The IVW method indicated a significant causal link between hypothyroidism and TN (p = 0.009).
• Weighted median (p = 0.008) and weighted mode (p = 0.016) approaches corroborated these findings.
• Sensitivity analyses confirmed the robustness of the results, with no significant directional pleiotropy detected (MR-Egger p = 0.351).

Conclusions:

• The Mendelian randomization study provides evidence supporting a direct causal relationship between hypothyroidism and the risk of trigeminal neuralgia.
• These findings highlight a potential genetic connection that may inform future research and clinical approaches.