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Event Related Potentials (ERPs) and other EEG Based Methods for Extracting Biomarkers of Brain Dysfunction: Examples from Pediatric Attention Deficit/Hyperactivity Disorder (ADHD)
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Gene-environment interactions in attention-deficit/hyperactivity disorder.

Courtney A Ficks1, Irwin D Waldman

  • 1Emory University, 317 Psychology Building, 532 Kilgo Circle, Atlanta, GA 30322, USA.

Current Psychiatry Reports
|September 30, 2009
PubMed
Summary

Gene-environment interactions may explain inconsistent genetic findings in attention-deficit/hyperactivity disorder (ADHD). Research suggests prenatal substance exposure and dopamine genes interact, but results vary, highlighting the need for further study.

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Psychology

Background:

  • Attention-deficit/hyperactivity disorder (ADHD) is a complex neurodevelopmental disorder with known genetic and environmental risk factors.
  • Previous research identified inconsistent genetic associations, suggesting other factors influence ADHD development.
  • Gene-environment interactions are increasingly recognized as crucial for understanding complex disorders like ADHD.

Purpose of the Study:

  • To review existing research on gene-environment interactions in attention-deficit/hyperactivity disorder (ADHD).
  • To explore how genetic and environmental factors may interact to contribute to ADHD.
  • To understand how these interactions might explain inconsistent findings in genetic association studies.

Main Methods:

  • Literature review of studies investigating gene-environment interactions in ADHD.
  • Analysis of findings related to environmental risk factors (e.g., prenatal exposure) and genetic associations (e.g., dopamine genes).
  • Synthesis of evidence regarding interactions between specific genes (DAT1, DRD4) and environmental exposures.

Main Results:

  • Evidence suggests potential interactions between prenatal substance exposure and dopamine genes (DAT1, DRD4) in ADHD.
  • However, findings across studies are mixed, indicating complexity and variability in these interactions.
  • Gene-environment interactions may partially explain the inconsistent results observed in genetic studies of ADHD.

Conclusions:

  • Gene-environment interactions are a significant area of research for understanding ADHD etiology.
  • Further research is needed to clarify the specific mechanisms and consistency of these interactions.
  • Addressing limitations in current research is essential for advancing our understanding of ADHD development.