Are there specific genes linked to ADHD?

PostedAugust 18, 2025

UpdatedSeptember 3, 2025

ByMy Patient Advice

Author: Lucia Alvarez, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Yes, researchers have identified several genes linked to ADHD, especially those involved in the brain’s dopamine and serotonin systems. These genes don’t cause ADHD directly, but they increase susceptibility by affecting how brain cells communicate, regulate attention, and manage impulse control. Among the most studied is the DRD4 gene, which plays a key role in dopamine signalling, an essential function that’s often dysregulated in individuals with ADHD.

Understanding which genes are involved helps explain why ADHD tends to run in families and opens the door to more targeted treatment options in the future.

Key genes under investigation

Here are some of the best-known genetic contributors to ADHD traits.

DRD4 gene ADHD

This dopamine receptor gene is associated with novelty-seeking and impulsivity. A specific variant, known as the 7-repeat allele, has been linked to increased ADHD risk, particularly in hyperactive-impulsive presentations.

Dopamine gene variations

Beyond DRD4, other dopamine-related genes like DAT1 (which affects dopamine transport) also show strong associations with ADHD. These genes influence how efficiently the brain processes rewards and focuses attention.

ADHD serotonin link

While dopamine is a central focus, serotonin-related genes are also under investigation. Variations in these genes may influence mood regulation and emotional reactivity, which often co-occur with ADHD symptoms.

While these genes linked to ADHD do not guarantee a diagnosis, they highlight the biological pathways that influence attention and behaviour. Visit providers like ADHD Certify to explore whether genetic factors may be shaping your or your child’s symptoms and how that can inform personalised treatment.

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Genetic Factors in ADHD.

Lucia Alvarez, MSc

Author

Lucia Alvarez is a clinical psychologist with a Master’s in Clinical Psychology and extensive experience providing evidence-based therapy and psychological assessment to children, adolescents, and adults. Skilled in CBT, DBT, and other therapeutic interventions, she has worked in hospital, community, and residential care settings. Her expertise includes grief counseling, anxiety management, and resilience-building, with a strong focus on creating safe, supportive environments to improve mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy.

Dr. Rebecca Fernandez, MBBS

Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy.