@article{
 title = {Association of the dopamine receptor D4 (DRD4) gene with a refined phenotype of attention deficit hyperactivity disorder (ADHD): a family-based approach.},
 type = {article},
 year = {1998},
 pages = {38-41},
 volume = {3},
 month = {1},
 id = {fed07ebb-b439-3a77-938c-26a72ac49d4a},
 created = {2012-07-30T10:59:55.000Z},
 file_attached = {false},
 profile_id = {031c901b-e377-3792-995f-e5d0201f5174},
 group_id = {40d3c649-5c00-3aab-bec6-a8b04ea00666},
 last_modified = {2017-03-14T17:04:22.077Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {false},
 hidden = {false},
 private_publication = {false},
 abstract = {Previously in this journal, we reported an association of the dopamine D4 receptor gene (DRD4) and attention deficit hyperactivity disorder (ADHD). In a population-association (case-control) study of 39 children with a refined phenotype of ADHD and 39 ethnically matched controls, we observed an increased percentage of the 7 repeat allele (29% vs 12%) and the 7+ genotype (49% vs 21%) in the ADHD group compared to the control group. In a replication and an extension of our initial study, we recruited another sample of ADHD subjects and found percentages of the 7 repeat allele (28%) and the 7+ genotype (48%) consistent with our previous findings. We used a family-based approach to evaluate a predicted association of DRD4 and ADHD based on a test of allele transmission focused on the 7 repeat allele. We identified 52 families based on the diagnosis of the refined phenotype of ADHD in the proband and the availability of DNA from both biological parents as well as the proband. Haplotype relative risk (HRR) analysis was performed to test our a priori hypothesis and produced significant results (chi-square = 4.65, P < 0.035). This provides additional evidence that the DRD4 gene is associated with a refined phenotype of ADHD.},
 bibtype = {article},
 author = {Swanson, J M and Sunohara, G A and Kennedy, J L and Regino, R and Fineberg, E and Wigal, T and Lerner, M and Williams, L and LaHoste, G J and Wigal, S},
 journal = {Molecular psychiatry},
 number = {1}
}

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In a population-association (case-control) study of 39 children with a refined phenotype of ADHD and 39 ethnically matched controls, we observed an increased percentage of the 7 repeat allele (29% vs 12%) and the 7+ genotype (49% vs 21%) in the ADHD group compared to the control group. In a replication and an extension of our initial study, we recruited another sample of ADHD subjects and found percentages of the 7 repeat allele (28%) and the 7+ genotype (48%) consistent with our previous findings. We used a family-based approach to evaluate a predicted association of DRD4 and ADHD based on a test of allele transmission focused on the 7 repeat allele. We identified 52 families based on the diagnosis of the refined phenotype of ADHD in the proband and the availability of DNA from both biological parents as well as the proband. Haplotype relative risk (HRR) analysis was performed to test our a priori hypothesis and produced significant results (chi-square = 4.65, P < 0.035). 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