Interleukin-33 gene variants (rs928413, rs16924159 and rs7037276) and susceptibility to asthma among Iraqi adult patients

Interleukin-33 is proposed to influence asthma susceptibility. Three IL33 gene variants (rs928413, rs16924159 and rs7037276) were included in a case-control study conducted on 104 Iraqi asthmatics and 111 controls. Tetra-primer-amplification-refractory-mutation-system-polymerase-chain-reaction method was used to determine these variants. Logistic regression analysis showed that A allele and AA genotype of rs928413 were significantly associated with an increased asthma risk under allele and recessive models, respectively. Regarding rs16924159, allele, recessive, dominant and codominant models demonstrated a significant association with asthma susceptibility, but the highest risk was found for AA genotype under recessive model. For SNP rs7037276, neither alleles nor genotypes were associated with asthma risk. Tri-locus haplotype analysis (in the order rs928413, rs16924159 and rs7037276) revealed that A-G-T haplotype frequency was significantly elevated in asthmatics compared to controls, while frequency of G-G-T haplotype was significantly decreased. In conclusions, two IL33 gene SNPs (rs928413 and rs16924159) were proposed to be associated with asthma susceptibility.