Distinct and shared genetics of kidney filtration function versus albuminuria revealed by multi-trait GWAS
de Hesselle, H. C.; Garben, B.-F.; Stark, K. J.; Warth, R.; Teumer, A.; Pattaro, C.; Heid, I. M.; Winkler, T. W.
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Chronic kidney disease is characterized by decreased glomerular filtration rate (eGFR, estimated from serum creatinine or cystatin C) or increased urinary albumin-to-creatinine-ratio (UACR). Genome-wide association studies provided the genetic make-up of these traits, but their overlap remained largely unknown. Our multi-trait GWAS (N=1M) identified 812 signals and multi-trait fine-mapping sharpened the identification of likely causal variants. Of 333 signals classified for filtration function or albuminuria, only 11 overlapped. Their effects on eGFR and UACR were directionally concordant, dominated by eGFR and independent of HbA1c or mean arterial pressure. Mapped genes pinpointed mechanisms related to glomerular filtration area (SHROOM3, EPB41L5) and sodium-mediated intraglomerular pressure (NRBP1, DPEP1/CHMP1A). Genetics of fluid intake resulted in shadow effects on UACR without albumin leakage into urine. Our multi-trait approach sharpened the identification of likely causal genes for kidney traits, demonstrated largely distinct genetics for filtration function versus albuminuria, and provided new biological insights into the overlap.
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