A preliminary report of the dopamine receptor D(4) and the dopamine transporter 1 gene polymorphism and its association with attention deficit hyperactivity disorder.
Attention deficit hyperactivity disorder (ADHD) is one of the most prevalent childhood-onset psychiatric syndromes affecting 5%-10% of school-age children worldwide. Distortions in the catecholaminergic system seem to be responsible for this condition. Within this system there are several candidate genes, the dopamine receptor D(4) (DRD4) and the dopamine transporter 1 (DAT1), with common polymorphism which might be associated with ADHD. We performed a family based association study with 36 trios and 19 parent proband pairs. All diagnoses were confirmed by the "Hypescheme" diagnostic computer program. In this study we did not observe an association of ADHD with DRD4 and DAT1 polymorphism neither by the haplotype relative risk (HRR) method nor by the transmission disequilibrium test (TdT) method. The odds ratio for the DRD4 7-allele was 1.01 and 0.94 for both statistical tests, respectively, and the respective odds ratio for the DAT1 6-allele were 0.91 and 0.88.
Niederhofer
Helmut
H
Ospedale Regionale di Bolzano, Via Guncina Bolzano, 54/A, I - 39100 Bolzano, Italia. helmutniederhofer@yahoo.de
Menzel
Frauke
F
Göbel
Karl
K
Hackenberg
Brigitte
B
Richter
Rainer
R
Walter
Maria Hildegard
MH
Gross
Christian
C
Huber
Markus
M
Pycha
Roger
R
Menzel
Hans-Jürgen
HJ