Genomics & Informatics

Korea Genome Organization (한국유전체학회)
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Association of an Anti-inflammatory Cytokine Gene IL4 Polymorphism with the Risk of Type 2 Diabetes Mellitus in Korean Populations

  • Go, Min-Jin (Center for Genome Science, Korea National Institute of Health, Korea Centers for Disease Control and Prevention, Osong Health Technology Administration Complex) ;
  • Min, Hae-Sook (Center for Genome Science, Korea National Institute of Health, Korea Centers for Disease Control and Prevention, Osong Health Technology Administration Complex) ;
  • Lee, Jong-Young (Center for Genome Science, Korea National Institute of Health, Korea Centers for Disease Control and Prevention, Osong Health Technology Administration Complex) ;
  • Kim, Sung-Soo (Center for Genome Science, Korea National Institute of Health, Korea Centers for Disease Control and Prevention, Osong Health Technology Administration Complex) ;
  • Kim, Yeon-Jung (Center for Genome Science, Korea National Institute of Health, Korea Centers for Disease Control and Prevention, Osong Health Technology Administration Complex)
  • Accepted : 2011.08.30
  • Published : 2011.09.30
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Abstract

Chronic inflammation has been implicated as one of the important etiological factors in insulin resistance and type 2 diabetes mellitus (T2DM). To investigate the role of anti-inflammatory cytokines in the development of T2DM, we conducted a case-control study to assess the association between IL4/IL4R polymorphisms and disease risk. We firstly identified single nucleotide poly-morphisms (SNP) at IL4 and IL4RA loci by sequencing the loci in Korean participants. Case-control studies were conducted by genotyping the SNPs in 474 T2DM cases and 470 non-diabetic controls recruited from community-based cohorts. Replication of the associated signals was performed in 1,216 cases and 1,352 controls. We assessed effect of IL4 -IL4RA interaction on T2DM using logistic regression method. The functional relevance of the SNP associated with disease risk was determined using a reporter expression assay. We identified a strong association between the IL4 promoter variant rs2243250 and T2DM risk (OR=0.77; 95% CI, 0.67~0.88; p=$1.65{\times}10^{－4}$ in the meta-analysis). The reporter gene expression assay demonstrated that the presence of rs2243250 might affect the gene expression level with ~1.5-fold allele difference. Our findings contribute to the identification of IL4 as a T2D susceptibility locus, further supporting the role of anti-inflammatory cytokines in T2DM disease development.

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References

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