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Epilepsy and childhood psychiatric disorders: a two-sample bidirectional Mendelian randomization study

YuXin Wu1,2, ZaiYu Zhang1,2, Xinyu Dong1,2

  • 1Department of Neurosurgery, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, Children's Hospital of Chongqing Medical University, No. 136, Zhongshan 2Nd Road, Yuzhong District, Chongqing, 400010, China.

Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology
|March 15, 2024
PubMed

Insights

This study found no causal link between pediatric epilepsy and attention deficit hyperactivity disorder (ADHD), autism spectrum disorder (ASD), or Tourette syndrome (TS). Findings suggest previous observational studies may have overestimated the relationship due to biases.

Area of Science:

  • Neuroscience
  • Genetics
  • Psychiatry

Background:

  • Pediatric epilepsy frequently co-occurs with psychiatric disorders.
  • The causal relationship between epilepsy and psychiatric conditions like ADHD, ASD, and TS is debated.
  • Previous observational studies suggest a strong association, but causality remains unclear.

Purpose of the Study:

  • To investigate the bidirectional causal relationship between common childhood psychiatric disorders and epilepsy.
  • Utilize a two-sample Mendelian randomization (MR) approach to assess genetic links.
  • Clarify the etiological connection between pediatric epilepsy and ADHD, ASD, and TS.

Main Methods:

  • Employed large-scale genome-wide association study (GWAS) datasets for epilepsy, ADHD, ASD, and TS.
  • Conducted bidirectional MR analyses using inverse variance weighted (IVW), weighted median, and MR-Egger methods.
  • Performed sensitivity analyses to ensure the robustness of findings.

Main Results:

  • No statistically significant evidence supported a causal effect of ADHD, ASD, or TS on epilepsy.
  • Conversely, no reliable evidence indicated that epilepsy causally increases the risk of these psychiatric disorders.
  • Results were consistent across all applied sensitivity analyses.

Conclusions:

  • Mendelian randomization analysis does not support a causal link between pediatric epilepsy and ADHD, ASD, or TS.
  • The high comorbidity observed in observational studies may be attributed to confounding or other biases.
  • Further research into the underlying mechanisms is essential for improving pediatric epilepsy treatment strategies.
Abstract

Keywords:
Attention deficit hyperactivity disorderAutism spectrum disorderEpilepsyMendelian randomizationTourette syndrome

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