Abstract
Twin studies described a strongly heritable component of attention-deficit/hyperactivity disorder (ADHD) in children and adolescents. However, findings varied considerably between studies. In addition, ADHD presents with a high rate of comorbid disorders and associated psychopathology. Therefore, this literature review reports findings from population-based twin studies regarding the influence of subtypes, assessment instruments, rater effects, sex differences, and comorbidity rates on ADHD heritability estimates. In addition, genetic effects on the persistence of ADHD are discussed. By reviewing relevant factors influencing heritability estimates more homogeneous subtypes relevant for molecular genetic studies can be elicited. A systematic search of population-based twin studies in ADHD was performed, using the databases PubMed and PsycInfo. Results of family studies were added in case insufficient or contradictory findings were obtained in twin studies. Heritability estimates were strongly influenced by rater effects and assessment instruments. Inattentive and hyperactive–impulsive symptoms were likely influenced by common as well as specific genetic risk factors. Besides persistent ADHD, ADHD accompanied by symptoms of conduct or antisocial personality disorder might be another strongly genetically determined subtype, however, family environmental risk factors have also been established for this pattern of comorbidity.
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Part of this work was supported by grants of the German Research Foundation (ME 1923/5-1, ME 1923/5-3, KFO125). C. Freitag was on the speakers’ bureau for Eli-Lilly and Janssen-Cilag. M. Romanos was on the speakers’ bureau for Janssen-Cilag and Medice. L. Rohde was on the speakers’ bureau and/or acted as consultant for Eli-Lilly, Janssen-Cilag, and Novartis in the last three years. Currently, his only industry related activity is taking part of the advisory board/speakers bureau for Eli Lilly and Novartis (less than U$ 10,000 per year and reflecting less than 5% of his gross income per year). The ADHD and Juvenile Bipolar Disorder Outpatient Programs chaired by him received unrestricted educational and research support from the following pharmaceutical companies in the last three years: Abbott, Bristol-Myers Squibb, Eli-Lilly, Janssen-Cilag, Novartis, and Shire.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00787-010-0108-6
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Freitag, C.M., Rohde, L.A., Lempp, T. et al. Phenotypic and measurement influences on heritability estimates in childhood ADHD. Eur Child Adolesc Psychiatry 19, 311–323 (2010). https://doi.org/10.1007/s00787-010-0097-5
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DOI: https://doi.org/10.1007/s00787-010-0097-5