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Dermatology Research and Practice
Volume 2014, Article ID 953597, 5 pages
http://dx.doi.org/10.1155/2014/953597
Research Article

IL-1RN VNTR Polymorphism in Adult Dermatomyositis and Systemic Lupus Erythematosus

1Molecular Medicine Center and Department of Medical Chemistry and Biochemistry, Medical University-Sofia, 2 Zdrave Street, 1431 Sofia, Bulgaria
2Department of Clinical Laboratory and Clinical Immunology and Department of Nephrology, Medical University-Sofia, 1 Georgi Sofijski Street, 1431 Sofia, Bulgaria
3National Genetic Laboratory, Maichin Dom Hospital, 2 Zdrave Street, 1431 Sofia, Bulgaria
428 Diagnostic and Consultative Center-Sofia, 1 Iliya Beshkov Street, 1592 Sofia, Bulgaria
5Department of Dermatology and Venereology, Medical University-Sofia, 1 Georgi Sofijski Street, 1431 Sofia, Bulgaria

Received 14 June 2014; Accepted 7 August 2014; Published 19 August 2014

Academic Editor: Elizabeth Helen Kemp

Copyright © 2014 Zornitsa Kamenarska et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Polymorphisms in the cytokine genes and their natural antagonists are thought to influence the predisposition to dermatomyositis (DM) and systemic lupus erythematosus (SLE). A variable number tandem repeat (VNTR) polymorphism of 86 bp in intron 2 of the interleukin-1 receptor antagonist (IL-1RN) gene leads to the existence of five different alleles which cause differences in the production of both IL-1RA (interleukin-1 receptor antagonist) and IL-1β. The aim of this case-control study was to investigate the association between the IL-1RN VNTR polymorphism and the susceptibility to DM and SLE in Bulgarian patients. Altogether 91 patients, 55 with SLE and 36 with DM, as well as 112 unrelated healthy controls, were included in this study. Only three alleles were identified in both patients and controls ((1) four repeats, (2) two repeats, and (3) five repeats). The IL-2 allele (, OR 2.5, and 95% CI 1.2–5.4) and the 1/2+2/2 genotypes were found prevalent among the SLE patients (, OR 2.6, and 95% CI 1–6.3). No association was found between this polymorphism and the ACR criteria for SLE as well as with the susceptibility to DM. Our results indicate that the IL-1RN VNTR polymorphism might play a role in the susceptibility of SLE but not DM.