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The effect of genetic markers associated with IgA nephropathy on risk of disease in sub-phenotype and progression is uncertain. Data from 2096 Chinese patients were used to create both un-weighted (uw) and weighted (w) genetic risk score (GRS). The association between GRS with disease susceptibility and clinical parameters were assessed. All nine selected single nucleotide polymorphisms (SNPs) were associated with susceptibility to IgAN. uwGRS and wGRS showed a similar fit in disease associations. With every 1-unit increase in the uwGRS, the disease risk increased by approximately 20%; whereas every one standard deviation increase in the wGRS, disease risk increased by approximately 40% ~ 60%. Association between rs3803800 and serum IgA was replicated, and risk groups in GRSs were associated with increased IgA/IgA1 levels. uwGRS9 ≥ 16 was an independent predictor for end stage renal disease (ESRD) in IgAN, with a relative risk of 2.52 (p = 6.68 × 10(-3)). In conclusion, we observed that GRSs comprising nine SNPs identified in a GWAS of IgAN were strongly associated with susceptibility to IgAN. The high risk GRS9 group had a high risk of ESRD in follow-up.

Cumulative Effects of Variants Identified by Genome-wide Association Studies in IgA Nephropathy