Causal effect of psychiatric disorders on epilepsy: A two-sample Mendelian randomization study

Area of Science:

• Neuroscience
• Psychiatry
• Genetics

Background:

• Investigating the causal relationship between psychiatric disorders and epilepsy risk is crucial for understanding disease etiology.
• Previous studies have suggested associations, but causal links remain unclear.

Approach:

• Utilized Mendelian randomization (MR) analysis with summary statistics from large genome-wide association studies (GWAS) for seven psychiatric traits.
• Performed MR analysis using International League Against Epilepsy (ILAE) and FinnGen consortium data, followed by a meta-analysis for robust validation.

Key Points:

• Found significant causal effects of major depressive disorder (MDD) and attention deficit hyperactivity disorder (ADHD) on epilepsy risk.
• MDD was linked to an increased risk of focal epilepsy, while ADHD was associated with generalized epilepsy.
• No reliable causal evidence was found for other psychiatric traits (anxiety, ASD, BIP, SCZ, insomnia) influencing epilepsy.

Conclusions:

• MDD and ADHD causally increase the risk of developing epilepsy.
• Findings highlight potential shared genetic or environmental factors contributing to both psychiatric disorders and epilepsy.
• Further research may explore targeted interventions for individuals with MDD or ADHD to mitigate epilepsy risk.