Impulsivity and epilepsy: a bidirectional mendelian randomization study.

Area of Science:

• Neuroscience
• Genetics
• Epidemiology

Background:

• Epilepsy is frequently associated with impulsivity, but the causal link remains unclear.
• Previous research indicates a higher prevalence of impulsivity in epilepsy patients.
• The directionality of the relationship between impulsivity and epilepsy requires further investigation.

Purpose of the Study:

• To investigate the causal relationship between impulsivity and epilepsy with recurrent seizures.
• To determine if impulsivity traits causally influence epilepsy risk.
• To assess if epilepsy causally affects impulsivity.

Main Methods:

• A bidirectional Mendelian randomization (MR) study design was employed.
• Genome-wide association study (GWAS) data for 14 impulsivity traits and epilepsy were analyzed.
• Inverse-variance weighted (IVW) and weighted median (WM) methods were used, with MR-Egger and MR-PRESSO for heterogeneity and pleiotropy assessment.

Main Results:

• Lack of perseverance was significantly associated with a reduced risk of epilepsy with recurrent seizures (OR=0.93, P=0.001).
• No significant heterogeneity or pleiotropy was detected, supporting the validity of the findings.
• No causal effect was observed between epilepsy and the 14 impulsivity traits, nor between other impulsivity traits and epilepsy.

Conclusions:

• Lack of perseverance may act as a protective factor against developing epilepsy with recurrent seizures.
• Epilepsy with recurrent seizures does not appear to have a causal impact on impulsivity traits.
• This study clarifies the unidirectional relationship, suggesting perseverance as a potential protective element.