Integration of rare large-effect expression variants improves polygenic risk prediction
Nicole M. Ferraro,
Matthew G Durrant,
Michael J. Gloudemans,
Themistocles L Assimes,
Alexander P Reiner,
Christopher J O'Donnell,
Yan V Sun,
Million Veteran Program,
Manuel A Rivas,
Stephen B Montgomery
Posted 11 Dec 2020
medRxiv DOI: 10.1101/2020.12.02.20242990
Posted 11 Dec 2020
Polygenic risk scores (PRS) aim to quantify the contribution of multiple genetic loci to an individual's likelihood of a complex trait or disease. However, existing PRS estimate genetic liability using common genetic variants, excluding the impact of rare variants. We identified rare, large-effect variants in individuals with outlier gene expression from the GTEx project and then assessed their impact on PRS predictions in the UK Biobank (UKB). We observed large deviations from the PRS-predicted phenotypes for carriers of multiple outlier rare variants; for example, individuals classified as low-risk but in the top 1% of outlier rare variant burden had a 6-fold higher rate of severe obesity. We replicated these findings using data from the NHLBI Trans-Omics for Precision Medicine (TOPMed) biobank and the Million Veteran Program, and demonstrated that PRS across multiple traits will significantly benefit from the inclusion of rare genetic variants.
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