Journal
MOLECULAR PSYCHIATRY
Volume 9, Issue 2, Pages 213-218Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.mp.4001418
Keywords
schizophrenia; bipolar disorder; linkage; genetic
Funding
- NIMH NIH HHS [MH058693, MH52618] Funding Source: Medline
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Schizophrenia is a common psychiatric disorder with a complex genetic etiology. To understand the genetic basis of this syndrome in Portuguese Island populations, we performed a genome-wide scan of 29 families with schizophrenia, which identified a single region on 5q31 - 5q35 with strong linkage (NPL = 3.09, P = 0.0012 at D5S820). Empirical simulations set a genome-wide threshold of NPL = 3.10 for significant linkage. Additional support for this locus in schizophrenia comes from higher-density mapping and mapping of 11 additional families. The combined set of 40 families had a peak NPL = 3.28 ( P = 0.00066) at markers D5S2112 D5S820. These data and previous linkage findings from other investigators provide strong and consistent evidence for this genomic region as a susceptibility locus for schizophrenia. Exploratory analyses of a novel phenotype, psychosis, in families with schizophrenia and bipolar disorder detected evidence for linkage to the same markers as found in schizophrenia ( peak NPL = 3.03, P = 0.0012 at D5S820), suggesting that this locus may be responsible for the psychotic symptoms observed in both diseases.
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