1. Maternally derived microduplications at 15q11-q13: implication of imprinted genes in psychotic illness
- Author
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Ingason, A., Kirov, G., Giegling, I., Hansen, T., Isles, A.R., Jakobsen, K.D., Kristinsson, K.T., Roux, L. le, Gustafsson, O., Craddock, N., Moller, H.J., McQuillin, A., Muglia, P., Cichon, S., Rietschel, M., Ophoff, R.A., Djurovic, S., Andreassen, O.A., Pietilainen, O.P.H., Peltonen, L., Dempster, E., Collier, D.A., St Clair, D., Rasmussen, H.B., Glenthoj, B.Y., Kiemeney, L.A.L.M., Franke, B., Tosato, S., Bonetto, C., Saemundsen, E., Hreidarsson, S.J., Nothen, Markus, Gurling, H., O'Donovan, M.C., Owen, M.J., Sigurdsson, E., Petursson, H., Stefansson, H., Rujescu, D., Stefansson, K., Werge, T., Ingason, A., Kirov, G., Giegling, I., Hansen, T., Isles, A.R., Jakobsen, K.D., Kristinsson, K.T., Roux, L. le, Gustafsson, O., Craddock, N., Moller, H.J., McQuillin, A., Muglia, P., Cichon, S., Rietschel, M., Ophoff, R.A., Djurovic, S., Andreassen, O.A., Pietilainen, O.P.H., Peltonen, L., Dempster, E., Collier, D.A., St Clair, D., Rasmussen, H.B., Glenthoj, B.Y., Kiemeney, L.A.L.M., Franke, B., Tosato, S., Bonetto, C., Saemundsen, E., Hreidarsson, S.J., Nothen, Markus, Gurling, H., O'Donovan, M.C., Owen, M.J., Sigurdsson, E., Petursson, H., Stefansson, H., Rujescu, D., Stefansson, K., and Werge, T.
- Abstract
Contains fulltext : 97099.pdf (publisher's version ) (Closed access), OBJECTIVE: Rare copy number variants have been implicated in different neurodevelopmental disorders, with the same copy number variants often increasing risk of more than one of these phenotypes. In a discovery sample of 22 schizophrenia patients with an early onset of illness (10-15 years of age), the authors observed in one patient a maternally derived 15q11-q13 duplication overlapping the Prader-Willi/Angelman syndrome critical region. This prompted investigation of the role of 15q11-q13 duplications in psychotic illness. METHOD: The authors scanned 7,582 patients with schizophrenia or schizoaffective disorder and 41,370 comparison subjects without known psychiatric illness for copy number variants at 15q11-q13 and determined the parental origin of duplications using methylation-sensitive Southern hybridization analysis. RESULTS: Duplications were found in four case patients and five comparison subjects. All four case patients had maternally derived duplications (0.05%), while only three of the five comparison duplications were maternally derived (0.007%), resulting in a significant excess of maternally derived duplications in case patients (odds ratio=7.3). This excess is compatible with earlier observations that risk for psychosis in people with Prader-Willi syndrome caused by maternal uniparental disomy is much higher than in those caused by deletion of the paternal chromosome. CONCLUSIONS: These findings suggest that the presence of two maternal copies of a fragment of chromosome 15q11.2-q13.1 that overlaps with the Prader-Willi/Angelman syndrome critical region may be a rare risk factor for schizophrenia and other psychoses. Given that maternal duplications of this region are among the most consistent cytogenetic observations in autism, the findings provide further support for a shared genetic etiology between autism and psychosis.
- Published
- 2011