Background Henoch-Schönlein purpura (HSP) is the most common type of primary small-sized blood vessel vasculitis in children and a rare entity in adults . Although the etiology of HSP remains unknown, environmental factors and a susceptible genetic background have been associated with this pathology . Interleukin-6 (IL-6) is a proinflammatory cytokine with a pivotal role in the immune system  and polymorphisms in the IL6 gene have been associated with several autoimmune diseases
Objectives In the present study, we assessed the potential association of three genetic variants located in the IL6 gene that cover the major variability of this gene with HSP susceptibility and severity.
Methods Our study population was composed of 285 Spanish patients diagnosed with HSP and 877 sex and ethnically matched Spanish controls. In addition to genotyping the traditional promoter single nucleotide polymorphism (SNP) -174G>C (rs1800795), we assessed another two SNPs (rs2069827 and rs2069840) located in the IL6 gene that were selected by SNP-tagging.
Results No significant differences in the genotypic and allelic frequencies between HSP patients and controls were observed when the rs2069827, rs1800795 and rs2069840 polymorphisms were analyzed independently or combined conforming haplotypes. Moreover, there were no differences in the allele or genotype frequency when HSP were stratified according to the age at disease onset, presence of nephritis or gastrointestinal manifestations.
Conclusions Our results do not support association between the IL6 rs2069827, rs1800795 and rs2069840 gene polymorphisms and HSP susceptibility or specific clinical features of the disease.
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Acknowledgements This study was supported by a grant from “Fondo de Investigaciones Sanitarias” PI12/00193 (Spain). RLM is a recipient of a Sara Borrell postdoctoral fellowship from the Instituto de Salud Carlos III at the Spanish Ministry of Health (Spain). FG and BU are supported by funds from the RETICS Program (RIER) (RD12/0009/0013).
Disclosure of Interest None declared
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