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Identification of a Haplotype Block in the 5q31 Cytokine Gene Cluster Associated with the Susceptibility to Severe Malaria

Overview
Journal Malar J
Publisher Biomed Central
Specialty Tropical Medicine
Date 2009 Oct 21
PMID 19840389
Citations 12
Authors
Affiliations
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Abstract

Background: It has been previously demonstrated that a single nucleotide polymorphism (SNP) in the IL13 promoter region, IL13 -1055T>C (rs1800925), was associated with susceptibility to severe malaria in Thais. In the present study, fine association mapping for a cytokine gene cluster including IL4, IL5, and IL13 on chromosome 5q31 was conducted using the same malaria subjects to refine the region containing a primary variant or a haplotype susceptible to severe malaria.

Methods: A total of 82 SNPs spanning 522 kb of the 5q31 region were analysed in 368 patients with Plasmodium falciparum malaria (203 mild malaria and 165 severe malaria patients).

Results: Only rs1881457 located in the promoter region of IL13, which is in linkage disequilibrium with rs1800925 (r2 = 0.73), showed a significant association with severe malaria after adjusting for multiple testing (P = 0.046 by permutation test). This SNP was in a haplotype block spanning 97 kb (from rs2069812 to rs2240032). The detected haplotype block contained the RAD50 gene and the promoter of IL13, but not the other genes.

Conclusion: A haplotype block in which a primary polymorphism associated with severe malaria is likely to be encoded was identified in Thai malaria patients.

Citing Articles

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