Abstract
Background
Henoch–Schönlein purpura (HSP) is a multisystemic vasculitis of unknown etiology. Cytotoxic T-lymphocyte-associated antigen-4 (CTLA-4) and CD28 have been reported to be important candidate genes for conferring susceptibility to autoimmunity. In this study, we investigated the correlation of CTLA-4 and CD28 gene polymorphisms with HSP in children with and without renal involvement.
Methods
The CTLA-4 exon 1 +49A/G, promoter -318C/T and CD28 IVS3 +17T/C single nucleotide polymorphisms (SNPs) were genotyped in 110 children with HSP and 90 ethnically matched healthy controls through restriction fragment-length polymorphism (RFLP).
Results
The CTLA-4 (+49) GG genotype and G allele (GG + AG genotype) were more common in HSP patients with renal involvement (n = 52) than in HSP patients without renal involvement (n = 58) (P = 0.019 and 0.001, respectively). There were no significant differences in the prevalence of CTLA-4 (+49 A/G), (-318C/T) and CD28 IVS3 (+17 /T/C) polymorphisms between HSP patients and controls.
Conclusions
Our findings suggest that the CTLA-4 +49 GG genotype and G allele may contribute to increased risk for the development of renal damage in HSP patients.
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Acknowledgements
The authors gratefully acknowledge Mrs. Yan-Ping Shi for her assistance with the case collection, as well as the enrolled children and their parents for their consent. This research project was supported by the Sichuan Provincial Health Office of Scientific Research (2010-100144).
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Wang, JJ., Shi, YP., Yue, H. et al. CTLA-4 exon 1 +49A/G polymorphism is associated with renal involvement in pediatric Henoch–Schönlein purpura. Pediatr Nephrol 27, 2059–2064 (2012). https://doi.org/10.1007/s00467-012-2216-7
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DOI: https://doi.org/10.1007/s00467-012-2216-7