Attention deficit hyperactivity disorder and the gene for dopamine Beta-hydroxylase

Area of Science:

• Neurogenetics
• Molecular Psychiatry

Background:

• Attention deficit hyperactivity disorder (ADHD) is highly heritable.
• Candidate genes in dopaminergic and noradrenergic systems are key research areas.
• Previous studies suggested a link between a DBH gene polymorphism and ADHD.

Purpose of the Study:

• To replicate findings on the association between a TaqI polymorphism in the DBH gene and ADHD.
• To investigate the linkage of DBH gene polymorphisms in families with ADHD.

Main Methods:

• Analysis of three polymorphisms at the DBH locus.
• Investigation of allele and haplotype linkage in 117 nuclear families with ADHD.

Main Results:

• No significant evidence for linkage of TaqI alleles or haplotypes was found.
• Some evidence for biased transmission of the TaqI polymorphism allele was observed, consistent with prior research.

Conclusions:

• The dopamine beta-hydroxylase (DBH) gene warrants further investigation in ADHD.
• The findings suggest a potential role for DBH in ADHD etiology, despite lack of direct linkage.
• Further research is needed to clarify the role of DBH gene variations in ADHD.