Effect of dopamine transporter genotype on caudate volume in childhood ADHD and controls.
Polymorphism of the dopamine transporter genotype (DAT1) confers a small but significant susceptibility to attention deficit hyperactivity disorder (ADHD). We examined whether the volume of the head of caudate, a striatal structure with high DAT expression that is important for inhibitory function, differs by DAT1 in children diagnosed with the disorder relative to age and IQ matched controls. Volume of the head of caudate was delineated in the right and left hemisphere and compared between 7- and 13-year-old children with and without ADHD (combined type) who were carriers of two (10/10) or one (9/10) copy of the 10-repeat DAT1 allele. Caudate volumes were overall smaller in 10/10 than 9/10 children, particularly in the left than right hemisphere. While DAT1 effects did not vary by ADHD diagnosis, overall caudate volumes were smaller in ADHD relative to control children. Altered caudate development associated with 10-repeat homozygosity of DAT1 may contribute susceptibility to ADHD.
Shook
Devon
D
Department of Psychology, Georgetown University, Washington, District of Columbia 20057, USA.
Brady
Colin
C
Lee
Philip S
PS
Kenealy
Laura
L
Murphy
Eric R
ER
Gaillard
William D
WD
VanMeter
John W
JW
Cook
Edwin H
EH
Stein
Mark
M
Vaidya
Chandan J
CJ
D000293:Adolescent; D001289:Attention Deficit Disorder with Hyperactivity / Q000235:genetics* / Q000473:pathology*; D001931:Brain Mapping; D016022:Case-Control Studies; D002421:Caudate Nucleus / Q000473:pathology*; D002648:Child; D003710:Demography; D050483:Dopamine Plasma Membrane Transport Proteins / Q000235:genetics*; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D009929:Organ Size
D050483:Dopamine Plasma Membrane Transport Proteins; C493214:SLC6A3 protein, human