Abstract
The alpha subunit of interleukin 5 receptor (IL5RA) on chromosome 3p26-p24 is known to regulate the development and function of eosinophils. In an effort to discover additional polymorphism(s) in genes whose variant(s) have been implicated in asthma, we investigated the genetic polymorphisms in IL5RA to evaluate the gene as a potential candidate for a host genetic study of asthma. By direct DNA sequencing in 24 individuals, we identified 22 sequence variants within exons and flanking regions including a 1.5-kb promoter region of IL5RA; 10 common polymorphic sites were selected for genotyping in our asthma cohort (n=587). Two haplotype blocks were identified in a Korean population. Statistical analysis revealed that one promoter SNP, c.-5993A>G, and one ins/del polymorphism in intron 3, c.-480_482insdelGTT, showed significant association with the risk of asthma development. The genetic effects of c.-5993A>G and c.-480_482insdelGTT on asthma were more apparent among atopic subjects. Our findings suggest that polymorphisms in IL5RA might be among the genetic risk factors for asthma development, especially in atopic populations. IL5RA variant/haplotype information identified in this study will provide valuable information for strategies for the control of asthma.
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This work was supported by grant number M1-0302-00-0073 of the National Research Lab Program as part of the National Research and Development Program of the Ministry of Science and Technology of Korea.
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Cheong, H.S., Kim, L.H., Park, B.L. et al. Association analysis of interleukin 5 receptor alpha subunit (IL5RA) polymorphisms and asthma. J Hum Genet 50, 628–634 (2005). https://doi.org/10.1007/s10038-005-0304-2
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DOI: https://doi.org/10.1007/s10038-005-0304-2
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