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Catechol-O-methyltransferase (COMT) Val108/158 Met polymorphism does not modulate executive function in children with
Evan Taerk1, Natalie Grizenko, Leila Ben Amor
1Department of Psychiatry, McGill University and Douglas Hospital Research Centre, Montreal, Quebec, H4H 1R3, Canada. evantaerk@yahoo.ca.
BMC Medical Genetics
|December 23, 2004
Summary
The catechol-O-methyltransferase (COMT) gene Val108/158 Met polymorphism did not affect executive functions in children with Attention Deficit Hyperactivity Disorder (ADHD). This contrasts with findings in adult populations, suggesting a different role in pediatric ADHD.
Area of Science:
- Neuroscience
- Genetics
- Child Psychology
Background:
- The catechol-O-methyltransferase (COMT) gene influences catecholamine metabolism in the prefrontal cortex (PFC).
- Prefrontal dopamine (DA) mechanisms are implicated in cognitive functions often impaired in Attention Deficit Hyperactivity Disorder (ADHD).
- Previous studies linked COMT gene polymorphisms to neuropsychological performance in adults with and without schizophrenia.
Purpose of the Study:
- To investigate the association between the COMT Val108/158 Met polymorphism and executive functions in children diagnosed with ADHD.
- To determine if this COMT gene variant modulates performance on specific neuropsychological tasks in a pediatric ADHD cohort.
Main Methods:
- Genotyping of the COMT Val108/158 Met polymorphism in 118 children with ADHD (DSM-IV criteria).
- Assessment of executive functions using the Wisconsin Card Sorting Test (WCST), Tower of London (TOL), and Self-Ordered Pointing Task (SOPT).
- Statistical comparison of neuropsychological task performance across different COMT genotype groups (Val/Val, Val/Met, Met/Met) using analysis of variance.
Main Results:
- Demographic and clinical characteristics were comparable across the Val/Val, Val/Met, and Met/Met genotype groups.
- No statistically significant genotype effects were found for WCST perseverative error scores (p > 0.05).
- No significant genotype effects were observed for TOL standardized scores (p > 0.05) or SOPT error scores (p > 0.05).
Conclusions:
- The Val108/158 Met polymorphism of the COMT gene does not appear to influence executive functions in children with ADHD.
- This finding diverges from associations reported in adult populations, indicating a potential difference in the gene's role in pediatric ADHD.
- The COMT gene polymorphism may not be a significant modulator of the specific executive functions assessed in this ADHD cohort.