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Association of interleukin-6 single nucleotide polymorphisms with juvenile idiopathic arthritis

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Abstract

Juvenile idiopathic arthritis (JIA) is the most common chronic rheumatic disease in children. Genetics and inflammatory elements seem to act as major underlying factors in its pathogenesis. The aim of this study is to identify the associations between interleukin-6 (IL-6) gene polymorphisms and individuals’ vulnerability to JIA in a group of Iranian pediatric patients. Fifty-four patients with JIA were enrolled in this investigation and compared with 139 healthy individuals. Using polymerase chain reaction with sequence-specific primers, cytokine genotyping was performed. The allele and genotype frequencies of two single nucleotide polymorphisms (SNPs) within the IL-6 gene at −174 and +565 positions were assessed. A significant positive association was observed for IL -6 −174 G allele in the patient group (p = 0.02). Furthermore, a positive association was observed in patients with JIA for the GG genotype at the same position (p < 0.01), thus revealing a predisposing effect in JIA patients. On the other hand, a significant negative association was found for IL-6 −174 CG genotype (p < 0.01) in the case group. No significant difference was discovered in both the allelic and genotypic frequencies of IL-6 +565 position between patients and controls. Additionally, haplotype analysis divulged over representation of IL-6 GG haplotype in patient group (p < 0.01) as well as IL-6 CG haplotype in healthy controls (p < 0.01). Certain allele, genotype, and haplotype in IL-6 gene were over expressed in patients with JIA, which probably could render individuals more susceptible to this disease.

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Acknowledgment

This study was funded by Tehran University of Medical Sciences and Health Services (grant number: 91–03–30–18149).

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Authors and Affiliations

  1. Division of Pediatric Rheumatology, Children’s Medical Center, Pediatrics Center of Excellence, Tehran University of Medical Sciences, Tehran, 14194, Iran

    Vahid Ziaee, Marzieh Maddah & Mohammad-Hassan Moradinejad

  2. Pediatric Rheumatology Research Group, Rheumatology Research Center, Tehran University of Medical Sciences, Tehran, Iran

    Vahid Ziaee

  3. Research Center for Immunodeficiencies, Children’s Medical Center, Tehran University of Medical Sciences, Tehran, 14194, Iran

    Arezou Rezaei, Sara Harsini & Nima Rezaei

  4. Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran

    Samaneh Zoghi & Nima Rezaei

  5. Primary Immunodeficiency Diseases Network (PIDNet), Universal Scientific Education and Research Network (USERN), Tehran, Iran

    Samaneh Zoghi & Sara Harsini

  6. Molecular Immunology Research Center, Children’s Medical Center, Tehran University of Medical Sciences, Tehran, 14194, Iran

    Maryam Sadr

  7. Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Boston, MA, USA

    Nima Rezaei

Authors
  1. Vahid Ziaee
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  2. Marzieh Maddah
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  3. Mohammad-Hassan Moradinejad
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  4. Arezou Rezaei
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  5. Samaneh Zoghi
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  6. Maryam Sadr
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  7. Sara Harsini
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  8. Nima Rezaei
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Correspondence to Vahid Ziaee or Nima Rezaei.

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Ziaee, V., Maddah, M., Moradinejad, MH. et al. Association of interleukin-6 single nucleotide polymorphisms with juvenile idiopathic arthritis. Clin Rheumatol 36, 77–81 (2017). https://doi.org/10.1007/s10067-016-3407-6

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  • DOI: https://doi.org/10.1007/s10067-016-3407-6

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