PUBLICATION

Genetic Association for Renal Traits among Participants of African Ancestry Reveals New Loci for Renal Function

Authors
Liu, C.T., Garnaas, M.K., Tin, A., Kottgen, A., Franceschini, N., Peralta, C.A., de Boer, I.H., Lu, X., Atkinson, E., Ding, J., Nalls, M., Shriner, D., Coresh, J., Kutlar, A., Bibbins-Domingo, K., Siscovick, D., Akylbekova, E., Wyatt, S., Astor, B., Mychaleckjy, J., Li, M., Reilly, M.P., Townsend, R.R., Adeyemo, A., Zonderman, A.B., de Andrade, M., Turner, S.T., Mosley, T.H., Harris, T.B., Rotimi, C.N., Liu, Y., Kardia, S.L., Evans, M.K., Shlipak, M.G., Kramer, H., Flessner, M.F., Dreisbach, A.W., Goessling, W., Cupples, L.A., Kao, W.L., Fox, C.S.
ID
ZDB-PUB-110921-37
Date
2011
Source
PLoS Genetics   7(9): e1002264 (Journal)
Registered Authors
Garnaas, Maija, Rotimi, Charles
Keywords
Chronic kidney disease, Embryos, African Americans, Genome-wide association studies, Zebrafish, Genetic loci, Kidneys, Morpholino
MeSH Terms
  • Adaptor Proteins, Vesicular Transport/genetics
  • Adult
  • Aged
  • Animals
  • Blacks/genetics*
  • Female
  • Gene Knockdown Techniques
  • Genetic Association Studies
  • Genetic Loci*
  • Genome-Wide Association Study
  • Glomerular Filtration Rate/genetics*
  • Humans
  • KCNQ1 Potassium Channel/genetics*
  • Kidney/physiology*
  • Kidney Failure, Chronic/genetics*
  • Male
  • Middle Aged
  • Neoplasm Proteins/genetics
  • Phenotype
  • Polymorphism, Single Nucleotide/genetics
  • Zebrafish/genetics
  • Zebrafish/growth & development
PubMed
21931561 Full text @ PLoS Genet.
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 m2), 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.
Genes / Markers
Figures
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Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping