Abstract
Previous work has demonstrated that Northern and Southern European ancestries are associated with specific systemic lupus erythematosus (SLE) manifestations. In this study, 1855 SLE cases of European descent were genotyped for 4965 single-nucleotide polymorphisms and principal components analysis of genotype information was used to define population substructure. The first principal component (PC1) distinguished Northern from Southern European ancestry, PC2 differentiated Eastern from Western European ancestry and PC3 delineated Ashkenazi Jewish ancestry. Compared with Northern European ancestry, Southern European ancestry was associated with autoantibody production (odds ratio (OR)=1.40, 95% confidence interval (CI) 1.07–1.83) and renal involvement (OR 1.41, 95% CI 1.06–1.87), and was protective for discoid rash (OR=0.51, 95% CI 0.32–0.82) and photosensitivity (OR=0.74, 95% CI 0.56–0.97). Both serositis (OR=1.46, 95% CI 1.12–1.89) and autoantibody production (OR=1.38, 95% CI 1.06–1.80) were associated with Western compared to Eastern European ancestry. Ashkenazi Jewish ancestry was protective against neurologic manifestations of SLE (OR=0.62, 95% CI 0.40–0.94). Homogeneous clusters of cases defined by multiple PCs demonstrated stronger phenotypic associations. Genetic ancestry may contribute to the development of SLE endophenotypes and should be accounted for in genetic studies of disease characteristics.
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Acknowledgements
This work has been supported by NIH/NIAMS grants P60 AR053308, K24 AR02175, R01 AR052300, and a Kirkland Scholar Award to Dr Criswell; NIH/NIAMS and NIH/NIAID grants R01 AI68759 and N01 AR1–2256 to Dr Gregersen; NIH/NIAMS grants R01 AR46588–05 and K24 AR002213-05 to Dr Manzi; and NIH/NIAMS grant R01 AR050267 to Dr Seldin. These studies were performed in part in the University of California, San Francisco, General Clinical Research Center (Moffitt Hospital), the University of Pittsburgh General Clinical Research Center and the Johns Hopkins University General Clinical Research Center with funds provided by the US Public Health Service National Center for Research Resources, M01 RR-00079, M01 RR-000056 and M01 RR-00052. This publication was also supported by NIH/NCRR/OD UCSF-CTSI grant number TL1 RR024129. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the NIH.
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Dr Behrens and Mr Ortmann are employees of Genentech.
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Richman, I., Chung, S., Taylor, K. et al. European population substructure correlates with systemic lupus erythematosus endophenotypes in North Americans of European descent. Genes Immun 11, 515–521 (2010). https://doi.org/10.1038/gene.2009.80
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DOI: https://doi.org/10.1038/gene.2009.80
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