Abstract:
:Recent studies report association and linkage between attention deficit hyperactivity disorder (ADHD) and the 7-repeat allele of a 48 base-pair repeat in the dopamine D4 receptor gene (DRD4). We examined the frequency of this allele in a sample of probands with DSM-IV ADHD using a case-control design, as well as the transmission disequilibrium test (TDT) and haplotype-based haplotype relative risk (HHRR) in the subset of probands with DNA available from both parents. One hundred and thirty-two ADHD probands were compared with 189 controls (chi(2) = 6.17, 1 df, P = 0.01, OR = 1.73, 95% CI = 1.11--2.71). A total of 85 complete trios were available for within-family tests of association and linkage. Fifty-two heterozygous parents carrying one copy of the 7-repeat were informative for the TDT (29 transmitted vs 23 non-transmitted, chi(2) = 0.69). Analysis of the entire sample of 132 probands using TRANSMIT provided no additional evidence for excess transmission of the 7-repeat allele (58 transmitted vs 54 non-transmitted). HHRR gave similar results. We conclude that the case-control findings are likely to be falsely positive, resulting from genetic stratification. However we can not rule out alternative explanations of low statistical power and gene-environment correlation.
journal_name
Mol Psychiatryjournal_title
Molecular psychiatryauthors
Mill J,Curran S,Kent L,Richards S,Gould A,Virdee V,Huckett L,Sharp J,Batten C,Fernando S,Simanoff E,Thompson M,Zhao J,Sham P,Taylor E,Asherson Pdoi
10.1038/sj.mp.4000881subject
Has Abstractpub_date
2001-07-01 00:00:00pages
440-4issue
4eissn
1359-4184issn
1476-5578journal_volume
6pub_type
杂志文章,多中心研究abstract::Studies using tissue obtained at autopsy suggest that changes in cholinergic neurons could be important in the pathology of schizophrenia.1-4 We have previously reported a decrease in [3H]pirenzepine binding5 and [3H]AF-DX 384 binding6 to caudate-putamen (CP) from subjects who had schizophrenia. Under the conditions c...
journal_title:Molecular psychiatry
pub_type: 杂志文章
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