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A TLR2 polymorphism is associated with type 1 diabetes and allergic asthma
M Bjørnvold1, M C Munthe-Kaas, T Egeland
1Institute of Medical Genetics, Faculty Division Ullevål University Hospital, University of Oslo, Blindern, Norway. marit.bjornvold@medisin.uio.no
Genes and Immunity
|January 17, 2009
Summary
Type 1 diabetes and allergic asthma share a common genetic susceptibility locus. Specific variations in Toll-like receptor 2 (TLR2) were significantly associated with both immune-mediated diseases in children.
Area of Science:
- Immunology
- Genetics
- Pediatrics
Background:
- Type 1 diabetes (T1D) and allergic asthma are immune-mediated diseases.
- Pattern recognition receptors, such as Toll-like receptors (TLRs) and CD14, are crucial in immune responses and may link microbial infections to immune diseases.
- Existing hypotheses propose either common or inverse genetic links between T1D and allergic asthma.
Purpose of the Study:
- To investigate potential common or inverse genetic associations between polymorphisms in pattern recognition receptors (TLR2, TLR4, CD14) and T1D and allergic asthma.
- To identify specific genetic variants that may confer susceptibility to both diseases.
Main Methods:
- Genotyping of 18 single nucleotide polymorphisms (SNPs) in TLR2, TLR4, and CD14 genes.
- Analysis of allele and haplotype frequencies in 700 T1D children, 357 T1D families, and 796 children from an asthma study.
- Transmission disequilibrium test (TDT) performed on family data.
Main Results:
- A significant association was found between the TLR2 rs3804100 T allele and both T1D and allergic asthma.
- A specific haplotype including the TLR2 rs3804100 T allele also showed significant association with both diseases.
- No significant associations were observed between TLR4 or CD14 polymorphisms and T1D or allergic asthma.
Conclusions:
- The TLR2 rs3804100 T allele and its associated haplotype represent a potential common genetic susceptibility locus for Type 1 diabetes and allergic asthma.
- These findings suggest a shared genetic pathway influencing the development of these two distinct immune-mediated diseases in children.
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