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Exclusion of the Darier's disease gene, ATP2A2, as a common susceptibility gene for bipolar disorder.
Bipolar affective disorder is a genetically complex psychiatric disorder with a population prevalence of approximately 1%. We have previously reported cosegregation of bipolar affective disorder and Darier's disease, a dominant skin disorder with a neuropsychiatric component. The gene for Darier's disease was mapped to chromosome 12q23-q24.1 and linkage studies by us and others have subsequently implicated this region as harbouring a susceptibility gene for bipolar affective disorder. In this study we have investigated the Darier's disease gene ATP2A2, the calcium pumping ATPase SERCA2, as a potential susceptibility gene for bipolar disorder under the hypothesis that variations in SERCA2 have pleiotropic effects in brain. Support for this hypothesis comes from clinical evidence of neuropsychiatric abnormalities in Darier's disease, genetic data produced in our study showing non-random clustering of missense mutations in ATP2A2 in neuropsychiatric Darier patients, and functional data demonstrating the role of SERCA2 in intracellular calcium regulation. In a panel of 15 unrelated bipolar patients from multiply affected families showing increased allele sharing at markers in the 12q23-q24.1 region, we performed mutational screening of the ATP2A2 coding sequence, promoter regions, and 3' untranslated region and identified six sequence variations. These were analysed in a large sample of bipolar patients (n = 324) and control subjects (n = 327). Analysis of allele and genotype distributions for all six variations, and of haplotype frequencies showed no evidence for the involvement of ATP2A2 in producing susceptibility to bipolar disorder.[1]References
- Exclusion of the Darier's disease gene, ATP2A2, as a common susceptibility gene for bipolar disorder. Jacobsen, N.J., Franks, E.K., Elvidge, G., Jones, I., McCandless, F., O'Donovan, M.C., Owen, M.J., Craddock, N. Mol. Psychiatry (2001) [Pubmed]
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