psychiatric disorders are complex and involve interactions between genetic and environmental factors, with DRD4 variants contribute to increased risk rather than causing the disorders outright.

University of Minnesota

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 DRD4 is linked to lower dopamine affinity and is associated with many psychiatric disorders such as ADHD, substance dependencies, and personality traits.

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