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Clinical relevance of genome-wide polygenic score may be less than claimed

Curtis, D; (2019) Clinical relevance of genome-wide polygenic score may be less than claimed. Annals of Human Genetics , 83 (4) pp. 274-277. 10.1111/ahg.12302. Green open access

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Abstract

OBJECTIVES: A recent study claimed that genome-wide polygenic scores (GPSs) for five common diseases could identify individuals with risk equivalent to monogenic mutations. Receiver operator curve analyses were reported to have areas under the curve (AUCs) ranging from 0.63 for inflammatory bowel disease up to 0.81 for coronary artery disease (CAD), but these models also included age and sex, themselves strong predictors of risk. The GPS for CAD identified 8% of the population at threefold increased risk, which was claimed to be comparable to the excess risk from monogenic mutations. METHODS: In the present study, attempts were made to model the distribution of the GPS for CAD to match the information provided. These models were based on the reported distribution of prevalence by centile of GPS and on the distribution of GPS in controls and cases, and were fitted to the reported results using linear approximations to the distributions and using simulations of a liability-threshold model. RESULTS: It was impossible to produce a compatible model in which the GPS produced an AUC as high as 0.81 and the most plausible estimate was that the true AUC was only 0.65. The reported distributions of the GPS in cases and controls overlap so much that they are not compatible with an AUC of 0.7 or higher. CONCLUSIONS: The AUC of the GPS for these diseases is modest. Furthermore, the literature robustly demonstrates that the true CAD risk associated with monogenic mutations is much higher than the threefold increase that is predicted by the GPS. Together, these findings cast doubt on the clinical utility of the GPS.

Type: Article
Title: Clinical relevance of genome-wide polygenic score may be less than claimed
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/ahg.12302
Publisher version: https://doi.org/10.1111/ahg.12302
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: AUC, coronary artery disease, genome-wide polygenic score
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: https://discovery.ucl.ac.uk/id/eprint/10071689
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