Mitochondrial DNA Copy Number is Associated with Attention Deficit Hyperactivity Disorder

Area of Science:

• Pediatric Neurology
• Genetics
• Biochemistry

Background:

• Attention Deficit Hyperactivity Disorder (ADHD) is a prevalent childhood psychiatric condition.
• Mitochondrial dysfunction (MD) is a proposed etiological factor in ADHD.
• Mitochondrial DNA (mtDNA) levels in leukocytes serve as a biomarker for MD.

Purpose of the Study:

• To investigate the association between mitochondrial dysfunction and ADHD.
• To compare mtDNA copy numbers in children with and without ADHD.

Main Methods:

• The study included 56 treatment-naïve children diagnosed with ADHD and 56 age- and sex-matched controls.
• Real-time PCR was used to quantify relative mtDNA copy number in peripheral blood leukocytes.

Main Results:

• Children with ADHD exhibited significantly higher mean mtDNA copy numbers (57.623±24.827) compared to controls (44.204±18.926; p=0.002).
• Receiver Operating Characteristic (ROC) curve analysis identified a mtDNA cutoff value of 45.

Conclusions:

• Elevated mtDNA copy number in the ADHD group suggests a potential link to mitochondrial dysfunction.
• Mitochondrial dysfunction may be implicated in the etiopathogenesis of ADHD.