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Genome-wide assessment of genetic risk for systemic lupus erythematosus and disease severity

Research output: Contribution to journalArticle

Lingyan Chen, Yong Fei Wang, Lu Liu, Adrianna Bielowka, Rahell Ahmed, Huoru Zhang, Phil Tombleson, Amy L. Roberts, Christopher A. Odhams, Deborah S. Cunninghame Graham, Xuejun Zhang, Wanling Yang, Timothy J. Vyse, David L. Morris

Original languageEnglish
Article numberddaa030
Pages (from-to)1745-1756
Number of pages12
JournalHuman Molecular Genetics
Volume29
Issue number10
Early online date20 Feb 2020
DOIs
Accepted/In press11 Feb 2020
E-pub ahead of print20 Feb 2020
Published27 Jun 2020

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Abstract

Objective: Using three European and two Chinese genome-wide association studies (GWAS), we investigated the performance of genetic risk scores (GRS) for predicting the susceptibility and severity of Systemic lupus erythematosus (SLE), using renal disease as a proxy for severity. Methods: We used four GWASs to test the performance of GRS both cross validating within the European population and between European and Chinese populations. The performance of GRS in SLE risk prediction was evaluated by Receiver Operating Characteristic (ROC) curves. We then analyzed the polygenic nature of SLE statistically. We also partitioned patients according to their age-of-onset and evaluated the predictability of GRS in disease severity in each age group. Results: We found consistently that the best GRS in the prediction of SLE used SNPs associated at the level of P<1e-05 in all GWAS datasets and that SNPs with P-values above 0.2 were inflated for SLE true positive signals. The GRS results in an area under the ROC curve ranging between 0.64 and 0.72, within European and between the European and Chinese populations. We further showed a significant positive correlation between a GRS and renal disease in two independent European GWAS (Pcohort1=2.44e-08; Pcohort2=0.00205) and a significant negative correlation with age of SLE onset (Pcohort1=1.76e-12; Pcohort2=0.00384). We found that the GRS performed better in prediction of renal disease in the ‘later onset’ compared to the ‘earlier onset’ group. Conclusion: The GRS predicts SLE in both European and Chinese populations and correlates with poorer prognostic factors: young age of onset and lupus nephritis.

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