Psychiatric disorders are complex conditions involving interactions between genetic and environmental factors. Variants of the dopamine receptor D4 (DRD4) gene contribute to an increased susceptibility to these disorders rather than causing them outright.

University of Minnesota

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D4, a part of dopamine receptor regulate neural signals affecting behavior 

Dopamine D4 receptor gene and it's association with psychiatric disorders

The 7-repeat allele of the dopamine receptor D4 (DRD4) gene is linked to lower dopamine affinity and is associated with an increased susceptibility to Attention-Deficit/Hyperactivity Disorder (ADHD).

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