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      Use of schizophrenia and bipolar disorder polygenic risk scores to identify psychotic disorders

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      Author(s)
      Calafato, M. S.
      Thygesen, J. H.
      Ranlund, S.
      Zartaloudi, E.
      Cahn, W.
      Crespo-Facorro, B.
      Díez-Revuelta, A.
      Forti, M. D.
      Hall, M. -H.
      Iyegbe, C.
      Jablensky, A.
      Kahn, R.
      Kalaydjieva, L.
      Kravariti, E.
      Lin, K.
      McDonald, C.
      McIntosh, A. M.
      McQuillin, A.
      Picchioni, M.
      Rujescu, D.
      Shaikh, M.
      Toulopoulou, Timothea
      Os, J. V.
      Vassos, E.
      Walshe, M.
      Powell, J.
      Lewis, C. M.
      Murray, R. M.
      Bramon, E.
      Date
      2018
      Source Title
      The British Journal of Psychiatry
      Print ISSN
      0007-1250
      Electronic ISSN
      1472-1465
      Volume
      213
      Issue
      3
      Pages
      535 - 541
      Language
      English
      Type
      Article
      Item Usage Stats
      216
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      162
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      Abstract
      Background There is increasing evidence for shared genetic susceptibility between schizophrenia and bipolar disorder. Although genetic variants only convey subtle increases in risk individually, their combination into a polygenic risk score constitutes a strong disease predictor. Aims To investigate whether schizophrenia and bipolar disorder polygenic risk scores can distinguish people with broadly defined psychosis and their unaffected relatives from controls. Method Using the latest Psychiatric Genomics Consortium data, we calculated schizophrenia and bipolar disorder polygenic risk scores for 1168 people with psychosis, 552 unaffected relatives and 1472 controls. Results Patients with broadly defined psychosis had dramatic increases in schizophrenia and bipolar polygenic risk scores, as did their relatives, albeit to a lesser degree. However, the accuracy of predictive models was modest. Conclusions Although polygenic risk scores are not ready for clinical use, it is hoped that as they are refined they could help towards risk reduction advice and early interventions for psychosis. Declaration of interest R.M.M. has received honoraria for lectures from Janssen, Lundbeck, Lilly, Otsuka and Sunovian.
      Keywords
      Bipolar disorder
      Polygenic
      Prediction
      Psychotic disorders
      Polygenic risk scores
      Schizophrenia
      Permalink
      http://hdl.handle.net/11693/50574
      Published Version (Please cite this version)
      https://doi.org/10.1192/bjp.2018.89
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