Journal
WORLD JOURNAL OF BIOLOGICAL PSYCHIATRY
Volume 18, Issue 4, Pages 291-299Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15622975.2016.1224928
Keywords
Attention deficit hyperactivity disorder; DNA methylation; dopamine transporter gene (DAT1; SLC6A3); dopamine receptor D4 gene (DRD4); methylphenidate efficacy
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Funding
- National Natural Science Foundation of China [30900488, 81460218]
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2015BAI13B01]
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Objectives: To examine the association of the DNA methylation of DAT1 and DRD4 gene with methylphenidate (MPH) response in attention deficit hyperactivity disorder (ADHD).Methods: One hundred and eleven DSM-IV defined ADHD Chinese Han children were recruited. Inattention, hyperactivity-impulsivity and oppositional symptoms were evaluated by the Swanson, Nolan and Pelham-IV-parent rating scale (SNAP-IV-P) at baseline and 6 weeks after MPH treatment. DNA methylation of CpG sites in the promoter sequences of DAT1 and DRD4 was examined for association with treatment response.Results: Greater improvement on the SNAP-IV-P total score and percentage change from baseline score were both significantly correlated with DAT1 methylation (rho=-0.222, P=.019 and rho=-0.203, P=.032, respectively). A secondary analysis demonstrated that the effect of DAT1 methylation on symptom response was primarily related to the percentage change in oppositional symptoms (rho=-0.242; P=.012), with a smaller significant effect on hyperactivity-impulsivity (rho=-0.192; P=.045). No significant correlation was found between the treatment effect on inattention and DAT1 methylation (rho=-0.101; P=.292). No significant correlation was observed between mean DRD4 methylation and measures of treatment outcome or baseline symptoms.Conclusions: Our findings provide initial evidence for the involvement of the epigenetic alterations of DAT1 in modulating the response to MPH treatment in ADHD, primarily on oppositional and hyperactive-impulsive symptoms.
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