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.

DRD4 and ADHD 

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.

DRD4 

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

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