Association of interleukin-10 gene promoter polymorphism in allergic patients.
OBJECTIVE
Allergic diseases are increasing alarmingly worldwide affecting >30% of the population, including India. Allergy is the result of interaction of the epitopes on the protein with the immunoglobulin E (IgE). T helper cell-2 cytokines promote allergen-specific IgE antibody and induce eosinophil-dominated inflammatory tissue responses. Interleukin-10 (IL-10), an antiinflammatory cytokine, plays a major role in the development of the allergy. The cytokine gene polymorphism of -592C→A (rs1800872) and -1082G→A (rs1800896) of IL-10 may influence the expression of the protein. Hence, the current study was aimed to evaluate the persistent association between these variants in the susceptibility of the disease.


METHODS
The allelic and genotype frequencies corresponding to IL-10 (-592C→A; -1082G→A) were determined in 94 allergic patients and 100 controls. Genomic typing was performed with polymerase chain reaction with sequence-specific primers.


RESULTS
The genotype AA at -592 position (p<0.000; odds ratio [OR] 9.92; 95% confidence interval [CI]=5.06-19.42) and GG at IL-10-1082 position (p<0.04; OR=2.47; 95% CI=1.003-4.96) was associated significantly in patients compared with controls. A considerable frequency of A-A haplotype in the patients and C-A, C-G haplotypes in controls was observed. A highly noteworthy difference was found in diplotype frequencies of A/A-A/A and A/A-G/A in patients and A/C-G/G and A/C-G/A in the controls.


CONCLUSIONS
Our results indicate that haplotype and diplotype frequencies of the IL-10 locus may confer susceptibility to allergic patients.
Bhagwan Mahavir Medical Research Centre, Hyderabad, India.
Suman Latha
SL
Gaddam
V Hari Sai
VH
Priya
B M V Srikanth
BM
Babu
Lavanya
L
Joshi
Sambasivan
S
Venkatasubramanian
Vijayalakshmi
V
Valluri
D000328:Adult; D017931:DNA Primers / Q000235:genetics; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D006967:Hypersensitivity / Q000235:genetics*; D007194:India; D016753:Interleukin-10 / Q000235:genetics*; D008297:Male; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic / Q000235:genetics*
D017931:DNA Primers; D016753:Interleukin-10