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Increased Prevalence of Interleukin-1 Receptor Antagonist Gene Polymorphism in Patients With Chronic Rhinosinusitis
Yuan-Kai Cheng, MD;
Chia-Der Lin, MD;
Weng-Cheng Chang, MD, PhD;
Guang-Yuh Hwang, PhD;
Shih-Wei Tsai, PhD;
Lei Wan, PhD;
Ming-Hsui Tsai, MD;
Jeffrey J. P. Tsai, PhD;
Fuu-Jen Tsai, MD, PhD
Arch Otolaryngol Head Neck Surg. 2006;132:285-290.
Objective To assess the association of the interleukin (IL)-1 and the IL-1 receptor antagonist (IL-1Ra) gene polymorphisms with chronic rhinosinusitis (CRS).
Design Genotyping of the 2 IL-1 gene (IL1B) polymorphisms (promoter and exon) and the IL-1Ra gene (IL1RN) polymorphism (intron 2) was performed using polymerase chain reaction and restriction length fragment polymorphism analyses.
Setting Prospective study, tertiary medical center.
Patients The study population comprised 88 consecutive adult Taiwan-Chinese patients who met stringent criteria for CRS and received endoscopic sinus surgery and 103 healthy volunteers of the same ethnicity and similar age range. Of the 88 patients, 61 had CRS with nasal polyps, while the other 27 had CRS without nasal polyps.
Results There were significant differences in the distribution of the IL1RN polymorphism between the control subjects and patients with CRS (P<.05). The II allele of IL1RN occurred more frequently in the CRS patient group, and the odds ratio for subjects with I/II genotype was 3.39 (95% confidence interval, 1.25-9.18). In the case of CRS without nasal polyps, the odds ratio for subjects with I/II genotype was further increased to 4.75 (1.39-16.25). There was no association between the other 2 polymorphisms of IL1B and CRS.
Conclusion Increased prevalence of IL1RN polymorphism in patients with CRS suggests that this polymorphism, or a polymorphism in linkage disequilibrium with it, may be involved in the development of CRS.
Author Affiliations: Departments of Otolaryngology (Drs Cheng, Lin, Chang, and M.-H. Tsai) and Medical Research (Drs Wan and F.-J. Tsai), China Medical University Hospital, Taichung, Taiwan; Department of Life Science, Tunghai University, Taichung (Drs Cheng and Hwang); Institute of Environmental Health, College of Public Health, National Taiwan University, Taipei, Taiwan (Dr S.-W. Tsai); and Department of Biotechnology and Bioinformatics, Asia University, Taichung (Dr J.J.P. Tsai).
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