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  • Title: Further evidence of no linkage between schizophrenia and the dopamine D3 receptor gene locus.
    Author: Nanko S, Fukuda R, Hattori M, Sasaki T, Dai XY, Yamaguchi K, Kazamatsuri H.
    Journal: Am J Med Genet; 1994 Sep 15; 54(3):264-7. PubMed ID: 7810586.
    Abstract:
    The dopamine hypothesis of schizophrenia proposed that dopaminergic pathways are involved in the etiology of the disease. In particular, interest among psychiatrists has focused on the D2 receptor because of its affinity to antipsychotic drugs. Recently a new dopamine receptor gene has been cloned, and named the dopamine D3 receptor. The D3 receptor is a potential site for antipsychotic drug action and may be involved in the pathophysiology of schizophrenia. We have carried out a linkage study between the susceptibility gene for schizophrenia and polymorphism of the dopamine D3 receptor gene in two Japanese pedigrees. The LOD scores were negative for all genetic models and for all affective status at a recombination fraction theta = 0. Linkage of DRD3 has been excluded for the model 1 (dominant model) and the model 3 (recessive model). The LOD score was -3.43 at theta = 0 for model 1 (dominant model) and broad definition of affected status. These results were consistent with previous studies.
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