Abstract
Background
This study aimed to synthesize evidence on the association between IL-10 gene (−819 C/T, −1082 A/G, −592 A/C) polymorphisms and the risk of developing diabetic nephropathy.
Methods
A systematic literature search was done in health-related electronic databases. The search was limited to studies published in English until September 2017. We also checked the references of retrieved articles and relevant reviews for any additional studies. The methodological quality of the studies included in this review was assessed using the ‘Scales for Quality Assessment’. The I2 test was used to quantify between-study heterogeneity. A value of I2 > 50% indicated substantial heterogeneity. For the pooled analysis, summary odds ratio (OR) and its 95% confidence interval (CI) in random effect model were used.
Results
Eight case-control studies (1192 cases with diabetic nephropathy and 2399 controls) met the inclusion criteria. Three groups of people namely Africans, Asians and Caucasians were included in this review. There were significant protective effects of SNP -819 C/T in overall population (OR 0.32, 95% CI 0.26–0.4) and − 1082 A/G SNP in the Asian population (OR 0.64, 95% CI 0.47–0.86) on diabetic nephropathy in the recessive model. There was no significant effect of −592 A/C on diabetic nephropathy.
Conclusion
The findings suggest the protective effects of −1082A/G and -819G/A polymorphisms on the risk of developing diabetic nephropathy in type 2 diabetes mellitus, especially in the Asian population. Well- designed, prospective studies with sufficient number of participants are recommended to substantiate these findings.
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Abbreviations
- AJOL :
-
African Journals online
- CI :
-
confidence intervals
- HWE :
-
Hardy-Weinberg equilibrium
- IL :
-
interleukin
- LILACS :
-
Latin American and Caribbean health sciences literature
- MeSH :
-
medical subject heading
- OR :
-
odds ratios
- SNP :
-
single nucleotide polymorphism
- T2DM :
-
type 2 diabetes mellitus
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Acknowledgements
The authors are grateful to the participants and researchers of the primary studies included in this analysis, and to the two anonymous reviewers and the editor for providing the comments and inputs to improve the quality of manuscript. We thank the International Medical University (IMU) in Kuala Lumpur of Malaysia for allowing us to perform this study.
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Contributions
SN: conceptualized and coordinated the study; CN, NHH, AKB: designed; CN, NHH: extracted data; AKB: checked data accuracy; CN, NHH, AKB: assessed quality of studies; CN, NHH: analyzed; SN, CN, AKB, NHH: interpreted; CN: wrote the first draft; CN, NHH, AKB, SN: revised the manuscript; All authors approved the final version of the revised manuscript.
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Ethics approval and consent were waived by the Joint Research and Ethics Committee at the International Medical University in Kula Lumpur of Malaysia as this study was exclusively performed with the published data.
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The authors declare that they have no competing interests.
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Additional File 1
Scale for quality assessment of molecular association studies of diabetic nephropathy (DOC 51 kb)
Additional File 2
Leave-one- out met analysis with −1082 A/G (PDF 88 kb)
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Naing, C., Htet, N.H., Basavaraj, A.K. et al. An association between IL-10 promoter polymorphisms and diabetic nephropathy: a meta-analysis of case-control studies. J Diabetes Metab Disord 17, 333–343 (2018). https://doi.org/10.1007/s40200-018-0349-3
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DOI: https://doi.org/10.1007/s40200-018-0349-3