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Association of polymorphisms at restriction enzyme recognition sites of apolipoprotein B and E gene with dyslipidemia in children undergoing primary nephrotic syndrome

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Abstract

Background Dyslipidemia, a common complication, is very prevalent in children with primary nephrotic syndrome (PNS). Recent studies have shown that genetic basis may be involved in the onset of HLP secondary to PNS. ApoB and E have been identified as the important candidate genes for lipid abnormalities. Objective: To investigate the association of apolipoprotein B (apoB) and E (apoE) genetic polymorphisms (Xba I, EcoR I, Msp I, and Hha I) with parameters describing the serum lipid profiles in children undergoing PNS. Methods: Genomic DNA was extracted from 250 children diagnosed with PNS and 200 healthy controls with neither allergic nor renal disease. ApoB (Xba I, EcoR I, and Msp I) and apoE (Hha I) genotypes were determined by PCR-restriction fragment length polymorphism (RFLP) analysis. The fasting serum lipoprotein (a) [Lp(a)], total cholesterol (TC), triglyceride (TG), high density lipoprotein cholesterol (HDL-C), low density lipoprotein cholesterol (LDL-C), apolipoprotein A1 (apoA1), apoB, and total protein from a 24-h urine sample were measured. Results: No significant differences in genotypes and alleles frequencies were observed for the apoB Xba I, EcoR I, Msp I and the apoE Hha I restriction sites in PNS patients as compared to controls (P > 0.05). Patients and controls with X + allele exhibited significantly higher serum levels of Lp(a), TC, nonHDL-C, LDL-C, LDL-C/HDL-C ratio, and apoB than that with X− allele (P < 0.05), whereas for apoA1/B ratio the opposite was found (P < 0.01). E−/E− carriers had significantly higher Lp(a), TC, HDL-C, and apoA1 concentrations than did E+/E− or E+/E+ carriers in control group (P < 0.05). Healthy children carrying the rare EcoR I allele had higher mean Lp(a), TC, and HDL-C levels than homozygotes for E+ (P < 0.05). Higher Lp(a) serum concentrations were observed in patients with E− allele (P < 0.05). No significant differences in lipid parameters were determined for the apoB Msp I and apoE Hha I the polymorphisms study (P > 0.05). When genetic variations were compared with urinary protein excretion, the Xba I X− allele was more frequent in patients with elevated proteinuria (P < 0.01). Conclusion: Presence of Xba I X+ allele and/or EcoR I E− at the apoB gene may be risk factors for lipid abnormalities secondary to childhood PNS.

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Acknowledgements

This study was supported by Natural Science Foundation of Guangxi Zhuang Autonomous Region (No. 0236029). The authors would like to gratefully acknowledge the most helpful comments on this paper received from Professor Lu Ling, Hu Bo, Department of Pediatrics, The first Affiliated Hospital of Anhui Medical University, Hefei.

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  1. Department of Pediatrics, First Affiliated Hospital of Guangxi Medical University, No. 6 Shuang-Yong Road, Nanning, Guangxi Zhuang Autonomous Region, China

    Peng Hu, Yuan Han Qin, Cheng Xue Jing, Feng Ying Lei, Ping Chen & Ming Fang Li

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  1. Peng Hu
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Correspondence to Yuan Han Qin.

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Hu, P., Qin, Y.H., Jing, C.X. et al. Association of polymorphisms at restriction enzyme recognition sites of apolipoprotein B and E gene with dyslipidemia in children undergoing primary nephrotic syndrome. Mol Biol Rep 36, 1015–1021 (2009). https://doi.org/10.1007/s11033-008-9275-7

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  • DOI: https://doi.org/10.1007/s11033-008-9275-7

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