Background: Allergy is regarded as a multifactorial condition that its onset and severity are influenced by both genetic and environmental factors. Hence, identification of genetic factors involved in allergic rhinitis development and its related phenotypes is a major task in understanding the genetic background of allergic rhinitis. This study was designed to examine the association between IL-18 -607 A/C promoter polymorphism on chromosome 11q22 and allergic rhinitis.

Materials and Methods: In this analytic study, genomic DNA was obtained from the blood samples of 293 patients with allergic rhinitis and 218 healthy controls by standard phenol chloroform method. The IL-18/-607 A/C polymorphism was analyzed by polymerase chain reaction and restriction fragment length polymorphism (PCR-RFLP) analysis. To analyze the association between genotypes and alleles and the disease in the case group compared with the control group, X2 test was used.

Results: The frequency of the AC genotype of the IL-18/-607 A/C gene polymorphism was significantly greater in allergic rhinitis patients than in controls (p<0.05). By comparing the frequency of AA genotype with other genotypes, OR was calculated as 2.03.

Conclusion: The results suggest that IL-18/-607 A/C polymorphism gene may be one of the factors participating in the pathogenesis of AR or its intermediary phenotypes.

Background: Allergic rhinitis, a chronic inflammatory disease of the respiratory tract, includes an IgE-mediated inflammatory response in the mucosal region of the aerial tubles. Since IL-8 plays a role in increasing the amount of immunoglobulin E and serves as an effective factor in the prevalence of this disease, so this study aims to investing at that whether IL-8 genotypes of 133 C/G polymorphism is associated with the amount of immunoglobulin E in serum in patients with allergic rhinitis.

Materials and Methods: In this analytical and descriptive study, by investigating 130 patients with AR and 62 healthy control volunteers in Chahar Mahalo Bakhtiari province, total level of IgE in serum was determined by ELISA method and then its association with 133 C/G polymorphism was investigated. T-test and chi-square statistical analyzes were performed using SPSS software for statistical analyses.

Results: the total serum IgE level of the patients with GC genotype of 133 C/G SNP were significantly higher regarding normal individuals (p<0.05).

Conclusion: The sigmificant relationship between 133 C/G genotype in IL-8 P gene promoter and increased serum IgE level confirms tht it plays a role in the prevalence of AR.