THE RELATIONSHIP BETWEEN HLA-DRB1*0103 AND HLA-DQA1*0201 GENOTYPES AND SPECIFIC IGE RESPONSES TO UNRELATED ALLERGENS IN ATOPIC PATIENTS

Because of the pivotal role of the human leukocyte antigen (HLA) class II molecules in regulating the immune response and their extensive polymorphism, it is not surprising that particular HLA class II alleles have been implicated in susceptibility to allergic diseases and in restriction of the IgE responses to a variety of allergens. We investigated the relationship between HLA-DRB1*0103 and HLA- DQA1*0201 genotypes and allergies to amoxicillin(AX) and love bird (LB) and explored their restriction of IgE responses to these allergens. Enzyme Linked Immunosorbent Assay test (ELISA) was used to examine the specific IgE antibodies in the sera of 175 subjects including 145 atopic patients and 30 healthy individuals without any allergic reaction. All of them were chosen for HLA genotyping by polymerase chain reaction . Compared with seropositive all control and seronegative individuals showed negative PCR HLA genotyping results.The higher overall rate (39.4%) of PCR positivity was observed inseropositive patients with positive PCR HLA-DQA1*0201 genotyping results .Also PCR HLA-DQA1*0201 genotyping revealed the higher rates of the PCR positivity in the males and females of the second age group in comparison with those of the first age groups but without significant difference (P > 0.05). The same result was also observed in positive PCR result for the patients with HLA-DRB1*0103 and those with both HLA -DRB1*0103 and HLA-DQA1*0201 as the non-significant higher PCR positive rates was observed in the males and females of the 2ndage groups.Also the females of the second age group showed the higher PCR positivity rates (100%,50% and30%)for HLA-DQA1*0201 and HLA-DRB1*0103) and both respectively ELISA results revealed that the overall rate of seropositivity in tested individuals to amoxicillin(AX) or love bird dropping extract (LBDE) allergens was 54.9% .The females were not significantly different (P ≥ 0.05) from males and they showed the higher rate of seropositivity against AX(57.9%)and LBDE(58.9%)allergens.In contrast there was no significant effect(P > 0.05)for the age on the seropositivity against LBDE and the patients of the 1st age group showed higher rate (55.9%) of seropositivity in comparison with rate (43.7%) of 2ndage group patients