Assessment of bidirectional relationships between multiple sclerosis and epilepsy: A two-sample Mendelian...

Area of Science:

• Neurology
• Genetics
• Epidemiology

Background:

• Epidemiological studies suggest an association between multiple sclerosis (MS) and epilepsy.
• The causal relationship and directionality between MS and epilepsy require further investigation.

Purpose of the Study:

• To investigate the causal relationship between multiple sclerosis (MS) and epilepsy using a bidirectional Mendelian randomization approach.

Main Methods:

• Employed a two-sample Mendelian randomization (MR) analysis utilizing large genome-wide association study data for MS and epilepsy.
• Applied the inverse variance weighted method as the primary analysis, supplemented by four additional MR methods.
• Conducted sensitivity analyses to ensure the robustness and reliability of the findings.

Main Results:

• Genetically predicted MS was associated with an increased risk of developing all epilepsy and generalized epilepsy.
• Conversely, epilepsy (all types, generalized, and focal) was found to elevate the risk of developing MS.
• Results were consistent across various sensitivity analyses, confirming the robustness of the bidirectional association.

Conclusions:

• Multiple sclerosis (MS) is potentially linked to a higher risk of developing epilepsy.
• Epilepsy may act as a causal factor influencing the risk of developing MS.
• These findings contribute to a deeper understanding of the complex interactions between MS and epilepsy.