We carried out a genome-wide association study of IgA nephropathy, a major cause of kidney failure worldwide. We studied 1,194 cases and 902 controls of Chinese Han ancestry, with targeted follow up in Chinese and European cohorts comprising 1,950 cases and 1,920 controls. We identified three independent loci in the major histocompatibility complex, as well as a common deletion of CFHR1 and CFHR3 at chromosome 1q32 and a locus at chromosome 22q12 that each surpassed genome-wide significance (P values for association between 1.59 × 10−26 and 4.84 × 10−9 and minor allele odds ratios of 0.63–0.80). These five loci explain 4–7% of the disease variance and up to a tenfold variation in interindividual risk. Many of the alleles that protect against IgA nephropathy impart increased risk for other autoimmune or infectious diseases, and IgA nephropathy risk allele frequencies closely parallel the variation in disease prevalence among Asian, European and African populations, suggesting complex selective pressures.
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We are grateful to all study participants for their contribution to this work. We also thank the staff of the Yale West Campus Center for Genome Analysis for their excellent support. We also appreciate the assistance of C.V. Barker and S.Y. Woodford with sample collection. This study was supported by RC1DK087445 (A.G.G., R.P.L.), R01DK082753 (A.G.G., J.N., B.A.J. and R.J.W.) and KL2 RR24157 (K.K.), the Center for Glomerular Diseases at Columbia University, the Yale Center Translational Science Award and the Yale Center for Human Genetics and Genomics. R.P.L. is an investigator of the Howard Hughes Medical Institute.
The authors declare no competing financial interests.
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Gharavi, A., Kiryluk, K., Choi, M. et al. Genome-wide association study identifies susceptibility loci for IgA nephropathy. Nat Genet 43, 321–327 (2011). https://doi.org/10.1038/ng.787
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