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Pre- and peri-natal environmental risks for attention-deficit hyperactivity disorder (ADHD): the potential role of
Jonathan Mill1, Arturas Petronis
1Institute of Psychiatry, SGDP Research Centre, London, UK. jonathan.mill@iop.kcl.ac.uk
Insights
Epigenetic dysregulation may link environmental factors to attention-deficit hyperactivity disorder (ADHD) in children. Understanding these reversible changes could lead to new ADHD prevention and treatment strategies.
Area of Science:
- Neuroscience
- Genetics
- Developmental Psychology
Background:
- Attention-deficit hyperactivity disorder (ADHD) is a common neurodevelopmental disorder characterized by inattention, impulsivity, and hyperactivity.
- Traditional ADHD research emphasizes genetic and environmental factors.
- Epigenetic factors, which modify gene expression without altering DNA sequence, are increasingly recognized for their role in complex phenotypes.
Purpose of the Study:
- To investigate the hypothesis that epigenetic dysregulation mediates the link between early-life environmental exposures and ADHD risk.
- To explore the potential of targeting epigenetic mechanisms for ADHD prevention and therapy.
Main Methods:
- This study is a hypothesis-driven review and theoretical proposal.
- It synthesizes existing knowledge on ADHD etiology, epigenetics, and environmental influences.
- No new empirical data were generated; the focus is on conceptualizing epigenetic roles.
Main Results:
- Epigenetic mechanisms offer a plausible pathway for environmental factors to induce lasting changes associated with ADHD.
- Environmental insults during early development may trigger epigenetic modifications that increase susceptibility to ADHD.
- Understanding these specific epigenetic links could reveal novel therapeutic targets.
Conclusions:
- Epigenetic dysregulation is proposed as a key mediator connecting early environmental insults to ADHD.
- Further research into specific epigenetic pathways is warranted to develop targeted preventative and therapeutic interventions for ADHD.
- This perspective broadens the etiological framework for ADHD beyond genetics and direct environmental causation.
Abstract:
Attention-deficit hyperactivity disorder (ADHD) is a common childhood neurobehavioural disorder defined by symptoms of developmentally inappropriate inattention, impulsivity and hyperactivity. As is the norm for most psychiatric phenotypes, traditional aetiological studies have focused primarily on the interplay between genetic and environmental factors. It is likely that epigenetic factors, i.e., heritable, but reversible changes to genomic function that are independent of DNA sequence, are also important. It is known that epigenetic processes can be induced following exposure to a range of external factors, and thus provide a mechanism by which the environment can lead to long-term alterations in phenotype. In this article we hypothesise that epigenetic dysregulation may mediate the association observed between early-development environmental insults and ADHD. We propose that understanding the epigenetic processes involved in linking specific environmental pathogens to an increased risk for ADHD may offer new possibilities for preventative and therapeutic intervention.
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