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Pre- and Perinatal Ischemia-Hypoxia, the Ischemia-Hypoxia Response Pathway, and ADHD Risk

Taylor F Smith1,2, Rainald Schmidt-Kastner3, John E McGeary4,5

  • 1Department of Psychology and Child Development, California Polytechnic State University, 1 Grand Ave., San Luis Obispo, CA, 93407, USA. tsmith82@calpoly.edu.

Behavior Genetics
|February 28, 2016
PubMed

Insights

Prenatal ischemia-hypoxia (insufficient blood and oxygen) and epigenetic changes linked to the ischemia-hypoxia response (IHR) pathway may increase ADHD risk, especially in low birth weight infants.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Attention-Deficit/Hyperactivity Disorder (ADHD) is a complex neurodevelopmental disorder.
  • The Developmental Origins of Health and Disease (DOHaD) hypothesis posits early-life factors influence later health outcomes.
  • Prenatal environmental exposures and epigenetic modifications are increasingly recognized as critical risk factors.

Purpose of the Study:

  • To review the interplay between prenatal environmental and epigenetic factors in ADHD development.
  • To explore the role of prenatal ischemia-hypoxia and its associated genetic and epigenetic alterations in ADHD neurodevelopmental pathways.
  • To identify research gaps and suggest future directions for genetically-informed ADHD research.

Main Methods:

  • Literature review synthesizing findings on pre- and perinatal risk factors for ADHD.
  • Focus on the ischemia-hypoxia response (IHR) pathway and its epigenetic modifications.
  • Analysis of the association between low birth weight, prenatal ischemia-hypoxia, and ADHD risk.

Main Results:

  • Lower birth weight, a consequence of prenatal ischemia-hypoxia, is associated with increased ADHD risk.
  • Altered ischemia-hypoxia response (IHR) pathway gene expression and lasting epigenetic modifications following prenatal ischemia-hypoxia may contribute to ADHD neurodevelopmental vulnerability.
  • Genetic vulnerability to ischemia-hypoxia combined with epigenetic alterations can increase ADHD risk.

Conclusions:

  • Prenatal ischemia-hypoxia is a significant pathway contributing to ADHD risk, mediated by low birth weight and altered IHR gene expression.
  • Epigenetic modifications within the IHR pathway following prenatal ischemia-hypoxia represent a key mechanism linking early-life stress to ADHD.
  • Further genetically-informed research is crucial to fully elucidate the complex etiology of ADHD.

Keywords:
ADHDDevelopmental pathwayEpigeneticHypoxiaIschemiaPrenatal

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