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Genetics of attention deficit hyperactivity disorder
1Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Warren 705, 55 Fruit Street, Boston, MA 02114-2622, USA.
Both genetic and environmental factors influence attention deficit hyperactivity disorder (ADHD) development. Research indicates many genes contribute small effects, requiring powerful studies to understand ADHD susceptibility.
Area of Science:
- Behavioral Genetics
- Molecular Genetics
- Psychiatry
Background:
- Attention Deficit Hyperactivity Disorder (ADHD) is a complex neurodevelopmental disorder.
- Both genetic and environmental influences are implicated in ADHD etiology.
Purpose of the Study:
- To synthesize findings from behavioral and molecular genetic studies on ADHD.
- To evaluate the role of genetic factors in ADHD susceptibility.
Main Methods:
- Review of family, twin, and adoption studies.
- Analysis of candidate gene studies in ADHD research.
- Consideration of genome-wide scan results.
Main Results:
- Strong evidence supports a significant genetic contribution to ADHD.
- Candidate gene studies suggest multiple genes are involved in ADHD etiology.
- Identified genetic associations are small, indicating polygenic inheritance.
Conclusions:
- ADHD susceptibility is influenced by numerous genes, each with a small effect.
- Future research requires enhanced statistical power to detect these small genetic effects.
- A combination of genetic and non-genetic factors underlies ADHD development.
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