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Bipolar multiplex families have an increased burden of common risk variants for psychiatric disorders

Andlauer, T., Guzman-Parra, J., Streit, F., Strohmaier, J., José González, M., Gil Flores, S., Orozco Diaz, G., de Diego-Otero, Y., Moreno-Küstner, B., Auburger, G., Degenhardt, F., Heilmann-Heimbach, S., Herms, S., Hoffman, P., Frank, J., Foo, J.C., Treutlein, J., Witt, S.H., Cichon, S., Kogevinas, M., Bipolar Working Group of the, Psychiatric Genomics Consortium, Major Depressive Disorder Working Group of the, Psychiatric Genomics Consortium, Rivas, F., Mayoral, F., Müller-Myhsok, B., Forstner, A.J., Nöthen, M.M., Rietschel, M., Gordon-Smith, Katherine, Jones, Lisa and Perry, Amy (2019) Bipolar multiplex families have an increased burden of common risk variants for psychiatric disorders. Molecular Psychiatry. ISSN Print: 1359-4184 Online: 1476-5578 (In Press)

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Abstract

Multiplex families with a high prevalence of a psychiatric disorder are often examined to identify rare genetic variants with large effect sizes. In the present study, we analysed whether the risk for bipolar disorder (BD) in BD multiplex families is influenced by common genetic variants. Furthermore, we investigated whether this risk is conferred mainly by BD-specific risk variants or by variants also associated with the susceptibility to schizophrenia or major depression. In total, 395 individuals from 33 Andalusian BD multiplex families (166 BD, 78 major depressive disorder, 151 unaffected) as well as 438 subjects from an independent, BD case/control cohort (161 unrelated BD, 277 unrelated controls) were analysed. Polygenic risk scores (PRS) for BD, schizophrenia (SCZ), and major depression were calculated and compared between the cohorts. Both the familial BD cases and unaffected family members had higher PRS for all three psychiatric disorders than the independent controls, with BD and SCZ being significant after correction for multiple testing, suggesting a high baseline risk for several psychiatric disorders in the families. Moreover, familial BD cases showed significantly higher BD PRS than unaffected family members and unrelated BD cases. A plausible hypothesis is that, in multiplex families with a general increase in risk for psychiatric disease, BD development is attributable to a high burden of common variants that confer a specific risk for BD. The present analyses demonstrated that common genetic risk variants for psychiatric disorders are likely to contribute to the high incidence of affective psychiatric disorders in the multiplex families. However, the PRS explained only part of the observed phenotypic variance, and rare variants might have also contributed to disease development.

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This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Uncontrolled Keywords: bipolar, multiplex families, risk variants, psychiatric disorders
Divisions: Divisions (2019 onwards) > College of Health, Life and Environmental Sciences > School of Allied Health and Community
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Copyright Info: Open access article
Depositing User: Katherine Gordon-Smith
Date Deposited: 29 Nov 2019 14:01
Last Modified: 03 Dec 2019 08:41
URI: https://eprints.worc.ac.uk/id/eprint/8941

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