Abstract
Aims/hypothesis
Diabetic nephropathy is a major diabetic complication, and diabetes is the leading cause of end-stage renal disease (ESRD). Family studies suggest a hereditary component for diabetic nephropathy. However, only a few genes have been associated with diabetic nephropathy or ESRD in diabetic patients. Our aim was to detect novel genetic variants associated with diabetic nephropathy and ESRD.
Methods
We exploited a novel algorithm, ‘Bag of Naive Bayes’, whose marker selection strategy is complementary to that of conventional genome-wide association models based on univariate association tests. The analysis was performed on a genome-wide association study of 3,464 patients with type 1 diabetes from the Finnish Diabetic Nephropathy (FinnDiane) Study and subsequently replicated with 4,263 type 1 diabetes patients from the Steno Diabetes Centre, the All Ireland-Warren 3-Genetics of Kidneys in Diabetes UK collection (UK–Republic of Ireland) and the Genetics of Kidneys in Diabetes US Study (GoKinD US).
Results
Five genetic loci (WNT4/ZBTB40-rs12137135, RGMA/MCTP2-rs17709344, MAPRE1P2-rs1670754, SEMA6D/SLC24A5-rs12917114 and SIK1-rs2838302) were associated with ESRD in the FinnDiane study. An association between ESRD and rs17709344, tagging the previously identified rs12437854 and located between the RGMA and MCTP2 genes, was replicated in independent case–control cohorts. rs12917114 near SEMA6D was associated with ESRD in the replication cohorts under the genotypic model (p < 0.05), and rs12137135 upstream of WNT4 was associated with ESRD in Steno.
Conclusions/interpretation
This study supports the previously identified findings on the RGMA/MCTP2 region and suggests novel susceptibility loci for ESRD. This highlights the importance of applying complementary statistical methods to detect novel genetic variants in diabetic nephropathy and, in general, in complex diseases.
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Abbreviations
- ACR:
-
Albumin/creatinine ratio
- BAI:
-
Body adiposity index
- BoNB:
-
Bag of Naive Bayes
- DBP:
-
Diastolic blood pressure
- eGFR:
-
Estimated GFR
- ESRD:
-
End-stage renal disease
- FDR:
-
False discovery rate
- FinnDiane:
-
Finnish Diabetic Nephropathy Study
- GENIE:
-
Genetics of Nephropathy–an International Effort
- GoKinD US:
-
Genetics of Kidneys in Diabetes US Study
- GWAS:
-
Genome-wide association study
- MCC:
-
Matthews correlation coefficient
- NBC:
-
Naive Bayes classifier
- SBP:
-
Systolic blood pressure
- SNP:
-
Single nucleotide polymorphism
- UK-ROI:
-
All Ireland-Warren 3-Genetics of Kidneys in Diabetes UK collection (UK and Republic of Ireland)
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Acknowledgements
We thank M. Parkkonen, A. Sandelin, A.-Reetta Salonen, T. Soppela and J. Tuomikangas for skilful laboratory assistance. We also thank all the patients who participated in the study and gratefully acknowledge all the physicians and nurses at each centre involved in the recruitment of participants (ESM Table 5). The members of the GENIE Consortium are listed in ESM Table 6.
Funding
The FinnDiane Study was supported by grants from the Folkhälsan Research Foundation, the Wilhelm and Else Stockmann Foundation, the Liv och Hälsa Foundation, Helsinki University Central Hospital Research Funds (EVO), the Sigrid Juselius Foundation, the Signe and Arne Gyllenberg Foundation, Finska Läkaresällskapet, the Novo Nordisk Foundation, the Academy of Finland (134379) and Tekes. The research was supported by the European Union's Seventh Framework Program (FP7/2007-2013) for the Innovative Medicine Initiative under grant agreement IMI/115006 (the SUMMIT consortium). The GENIE consortium was funded by National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Diseases (NIH NIDDK) R01DK081923 and the Northern Ireland Research and Development Office. M. Stavarachi was supported by the Sectoral Operational Programme Human Resources Development (SOP HRD), financed from the European Social Fund and by the Romanian Government under contract number POSDRU/89/1.5/S/64109. V.-P. Mäkinen was supported by American Heart Association (13POST17240095).
Duality of interest
P-HG has received lecture honoraria from Abbot, Boehringer Ingelheim, Cebix, Eli Lilly, Genzyme, Novartis, Novo Nordisk and MSD, and research grants from Eli Lilly, Roche. P-HG is also an advisory board member for Boehringer Ingelheim, Novartis and Medscape.
Contribution statement
FS, AM, NS and M. Stavarachi analysed data and wrote the manuscript. CF contributed to the conception and design and acquisition of data, and revised the manuscript critically. V-PM contributed to the conception and design and revised the manuscript critically. VH, RL, DG, MP, M. Saraheimo, LMT, NT, JW, BH, A-MÖ, JT, ML, AJM, LT, KT, NMP and P-HG contributed to the acquisition of the genotypic and/or phenotypic data and revised the manuscript critically. RMS and AJM analysed data and revised the manuscript. NB, BD and GMT contributed to the interpretation of the results, revised and edited the manuscript. RB, CC and P-HG designed and supervised the study and revised the manuscript. All the authors approved the final version of the manuscript. P-HG is the guarantor of this work.
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F. Sambo, A. Malovini, N. Sandholm and M. Stavarachi contributed equally to this work.
The list of GENIE members is provided in the electronic supplementary material.
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ESM Table 1
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ESM Table 4
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ESM Table 5
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ESM Table 6
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Sambo, F., Malovini, A., Sandholm, N. et al. Novel genetic susceptibility loci for diabetic end-stage renal disease identified through robust naive Bayes classification. Diabetologia 57, 1611–1622 (2014). https://doi.org/10.1007/s00125-014-3256-2
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DOI: https://doi.org/10.1007/s00125-014-3256-2