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De novo variation in bipolar disorder

Molecular Psychiatry volume 26, pages 4127–4136 (2021)Cite this article

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Abstract

Bipolar disorder (BD) is a common, highly heritable disorder that affects 1–2% of the world’s population. To date, most genetic studies of BD have focused on common gene variation, and while robustly associated loci have been identified, a substantial proportion of the heritability remains missing and could be partially attributable to rare variation. In this study, we apply a de novo paradigm in BD to identify newly arisen variants that have yet to undergo natural selection and may represent highly pathogenic variants. We performed whole genome sequencing of 97 trios of Ashkenazi Jewish descent, selecting “simplex” families with no family history of BD and an early age of onset. We found a total of 6882 de novo variants (an average of 70.9 ± 12.9 S.D. variants per trio), including 107 variants within protein-coding genes. We combined our exonic variations with the results of 79 previously published BD trios, identifying 20 loss-of-function (LoF) and 77 missense damaging de novo variants in BD. These variants showed significant enrichment for constrained genes and for genes located to the postsynaptic density (PSD) (all Bonferroni corrected p < 0.05). Pathway analyses showed enrichment in several pathways, including “Phosphoinositides (PI) and their downstream targets” (Bonferroni p = 4.2 × 10−6), a pathway prominently featured in lithium’s hypothesized mechanism of action. In addition, while we found overall evidence for transmission of common variant polygenic risk of BD in our full sample (pTDT p = 2.21 × 10−4), specific trios with LoF variants showed no evidence of polygenic transmission. In sum, our findings support the de novo paradigm as a contributor to the genetic architecture of BD and provide evidence that constrained genes, as well as genes within the PSD and PI pathway harbor rare variation associated with BD.

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Acknowledgements

Supported by NIMH grant R00MH86049 to FSG, and MH057314 and MH068406 to AEP. We thank the participating families for their generous contribution to the project.

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  1. Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, 550 N. Broadway, Suite 202, Baltimore, MD, 21287, USA

    Fernando S. Goes, Mehdi Pirooznia, Martin Tehan, Peter P. Zandi, John McGrath, Paula Wolyniec, Gerald Nestadt & Ann. E. Pulver

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  1. Fernando S. Goes
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Goes, F.S., Pirooznia, M., Tehan, M. et al. De novo variation in bipolar disorder. Mol Psychiatry 26, 4127–4136 (2021). https://doi.org/10.1038/s41380-019-0611-1

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