Exclusion of linkage of schizophrenia to the gene for the dopamine D2 receptor (DRD2) and chromosome 11q translocation sites

SYNOPSIS There have been previous reports of a 1q43;11q21 translocation cosegregating with schizophrenia and a 9p22;11q22.3 translocation cosegregating with manic depression. In addition, the genes for the dopamine D2 receptor and for tyrosinase both map to chromosome 11q. Three 11q DNA markers were used to investigate 23 pedigrees containing multiple cases of schizophrenia. Strongly negative lod scores were obtained, providing evidence against linkage over a 70 cM region which included both translocation sites and both candidate genes.

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