Genetic association for renal traits among participants of African Ancestry reveals new loci for renal function

Ching Ti Liu, Maija K. Garnaas, Adrienne Tin, Anna Kottgen, Nora Franceschini, Carmen A. Peralta, Ian H. de Boer, Xiaoning Lu, Elizabeth Atkinson, Jingzhong Ding, Michael Nalls, Daniel Shriner, Josef Coresh, Abdullah Kutlar, Kirsten Bibbins-Domingo, David Siscovick, Ermeg Akylbekova, Sharon Wyatt, Brad Astor, Josef MychaleckjyMan Li, Muredach P. Reilly, Raymond R. Townsend, Adebowale Adeyemo, Alan B. Zonderman, Mariza de Andrade, Stephen T. Turner, Thomas H. Mosley, Tamara B. Harris, Charles N. Rotimi, Yongmei Liu, Sharon L.R. Kardia, Michele K. Evans, Michael G. Shlipak, Holly Kramer, Michael F. Flessner, Albert W. Dreisbach, Wolfram Goessling, L. Adrienne Cupples, W. Linda Kao, Caroline S. Fox

Research output: Contribution to journalArticlepeer-review

85 Scopus citations

Abstract

Chronic kidney disease (CKD) is an increasing global public health concern, particularly among populations of African ancestry. We performed an interrogation of known renal loci, genome-wide association (GWA), and IBC candidate-gene SNP association analyses in African Americans from the CARe Renal Consortium. In up to 8,110 participants, we performed meta-analyses of GWA and IBC array data for estimated glomerular filtration rate (eGFR), CKD (eGFR <60 mL/min/1.73 m 2), urinary albumin-to-creatinine ratio (UACR), and microalbuminuria (UACR >30 mg/g) and interrogated the 250 kb flanking region around 24 SNPs previously identified in European Ancestry renal GWAS analyses. Findings were replicated in up to 4,358 African Americans. To assess function, individually identified genes were knocked down in zebrafish embryos by morpholino antisense oligonucleotides. Expression of kidney-specific genes was assessed by in situ hybridization, and glomerular filtration was evaluated by dextran clearance. Overall, 23 of 24 previously identified SNPs had direction-consistent associations with eGFR in African Americans, 2 of which achieved nominal significance (UMOD, PIP5K1B). Interrogation of the flanking regions uncovered 24 new index SNPs in African Americans, 12 of which were replicated (UMOD, ANXA9, GCKR, TFDP2, DAB2, VEGFA, ATXN2, GATM, SLC22A2, TMEM60, SLC6A13, and BCAS3). In addition, we identified 3 suggestive loci at DOK6 (p-value = 5.3×10 -7) and FNDC1 (p-value = 3.0×10 -7) for UACR, and KCNQ1 with eGFR (p = 3.6×10 -6). Morpholino knockdown of kcnq1 in the zebrafish resulted in abnormal kidney development and filtration capacity. We identified several SNPs in association with eGFR in African Ancestry individuals, as well as 3 suggestive loci for UACR and eGFR. Functional genetic studies support a role for kcnq1 in glomerular development in zebrafish.

Original languageEnglish (US)
Article numbere1002264
JournalPLoS genetics
Volume7
Issue number9
DOIs
StatePublished - Sep 2011

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics
  • Genetics(clinical)
  • Cancer Research

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