Is ADHD Genetic?

Plain-language summary

Research suggests that ADHD can run in families, indicating a strong genetic component. While genes play a significant role, it's also important to remember that environmental factors can contribute to its development. The overall evidence points towards ADHD being a condition influenced by a combination of both nature and nurture, with a notable genetic predisposition.

Key findings

• Twin studies repeatedly show that ADHD is highly heritable, meaning genes contribute significantly to its development.
• Variations in specific genes are associated with an increased risk of ADHD, although no single gene is solely responsible.
• Genetic factors not only influence ADHD itself but also related traits and conditions that often co-occur with ADHD.
• Research using tools like genome-wide association studies (GWAS) helps identify various genes that collectively contribute to the complexity of ADHD.
• While genetics play a major role, they interact with environmental factors, making ADHD a complex condition with multiple contributing elements.

Studies cited (8)

1. The nature and nurture of ADHD and its comorbidities: A narrative review on twin studies — Tistarelli N, Fagnani C, Troianiello M (2020, Neuroscience and biobehavioral reviews, review)

   DOI: 10.1016/j.neubiorev.2019.12.017

2. Genomic basis of delayed reward discounting — Gray JC, Sanchez-Roige S, de Wit H (2019, Behavioural processes, other)

   DOI: 10.1016/j.beproc.2019.03.006 PMCID: PMC6980721

3. What have we learned from recent twin studies about the etiology of neurodevelopmental disorders? — Posthuma D, Polderman TJ (2013, Current opinion in neurology, other)

   DOI: 10.1097/WCO.0b013e32835f19c3

4. Twin and sibling studies using health insurance data: the example of attention deficit/hyperactivity disorder (ADHD) — Langner I, Garbe E, Banaschewski T (2013, PloS one, other)

   DOI: 10.1371/journal.pone.0062177 PMCID: PMC3634807

5. Twin studies and their implications for molecular genetic studies: endophenotypes integrate quantitative and molecular genetics in ADHD research — Wood AC, Neale MC (2010, Journal of the American Academy of Child and Adolescent Psychiatry, other)

   DOI: 10.1016/j.jaac.2010.06.006 PMCID: PMC3148177

6. Genetics of attention-deficit hyperactivity disorder (ADHD) — Sharp SI, McQuillin A, Gurling HM (2009, Neuropharmacology, other)

   DOI: 10.1016/j.neuropharm.2009.08.011

7. Molecular genetics of attention-deficit/hyperactivity disorder — Faraone SV, Perlis RH, Doyle AE (2005, Biological psychiatry, other)

   DOI: 10.1016/j.biopsych.2004.11.024

8. Attention-deficit/hyperactivity disorder endophenotypes — Doyle AE, Willcutt EG, Seidman LJ (2005, Biological psychiatry, other)

   DOI: 10.1016/j.biopsych.2005.03.015