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Difference in the Transcriptional Activity of the Interleukin-4 Promoter Haplotypes  

Choi, Eun Hwa (Department of Pediatrics, Seoul National University College of Medicine)
Kim, Hee Sup (Pediatric Oncology Branch, National Cancer Institute, National Institutes of Health)
Chanock, Stephen J. (Pediatric Oncology Branch, National Cancer Institute, National Institutes of Health)
Lee, Hoan Jong (Department of Pediatrics, Seoul National University College of Medicine)
Publication Information
Clinical and Experimental Pediatrics / v.48, no.5, 2005 , pp. 495-499 More about this Journal
Abstract
Purpose : Interleukin-4(IL-4) is a critical component of the Th2 cytokine pathway and contributes to severity of respiratory syncytial virus(RSV) bronchiolitis. Previous studies observed an association between severe RSV bronchiolitis in Korean children with a common haplotype of the IL4 promoter. This study was performed to investigate functional differences of the variant IL4 promoter haplotypes. Methods : Genomic DNA was obtained from 20 children from 6 to 48 months of age in the Department of Pediatrics, Seoul National University Bundang Hospital. The IL4 promoter spanning an 1.2 kb region was amplified and haplotype was determined by cloning and the PHASE reconstruction. Transcriptional activity of Jurkat T cells which were transfected with each IL4 haplotype were analyzed by use of luciferase assay. Results : Three haplotypes of the IL4 promoter have been identified with the frequency of GCC(7 percent), TCC(17 percent), and TTT(76 percent). The TTT haplotype demonstrated the highest luciferase values in both unstimulated and PMA-stimulated Jurkat T cells. Increases in transcriptional activity compared to GCC have been shown in TTT(5.3 fold higher) followed by TCC(4.2 fold higher) in unstimulated Jurkat T cells. Conclusion : We provided evidence that increased transcriptional activity of the TTT haplotype of the IL4 promoter, which has previously been over-represented in Korean children with severe RSV bronchiolitis. Therefore, IL-4 could play a potential role in the pathogenesis of RSV infection, possibly via an altered transcriptional activity of the different IL4 haplotypes.
Keywords
Respiratory syncytial virus; Transcriptional activation; Interleukin 4; Haplotype;
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