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A Mal functional variant is associated with protection against invasive pneumococcal disease, bacteremia, malaria and

Chiea C Khor1, Stephen J Chapman, Fredrik O Vannberg

  • 1The Wellcome Trust Centre for Human Genetics, University of Oxford, UK.

Nature Genetics
|February 27, 2007
PubMed

Insights

A specific genetic variant in the Mal adaptor protein (S180L heterozygosity) was found to protect against common infectious diseases like pneumococcal disease, malaria, and tuberculosis. This finding highlights a potential genetic factor influencing innate immunity.

Area of Science:

  • Immunology
  • Genetics
  • Infectious Diseases

Background:

  • Toll-like receptors (TLRs) initiate innate immune responses.
  • The adaptor protein Mal (TIRAP) is crucial for TLR2 and TLR4 signaling.
  • Genetic variations in immune response genes can impact susceptibility to infections.

Purpose of the Study:

  • To investigate the association between genetic variants in the TIRAP gene and susceptibility to infectious diseases.
  • To identify specific single nucleotide polymorphisms (SNPs) related to immune response.
  • To analyze the functional impact of identified variants on TLR signaling.

Main Methods:

  • A case-control study involving 6,106 individuals from diverse populations.
  • Genotyping of 33 SNPs in the TIRAP gene, including rs8177374.
  • Statistical analysis to assess the association between the Mal S180L variant and infectious diseases (pneumococcal disease, bacteremia, malaria, tuberculosis).
  • Functional assays to evaluate the effect of the Mal S180L variant on TLR2 signal transduction.

Main Results:

  • Heterozygous carriage of the Mal S180L variant (rs8177374) was independently associated with protection against invasive pneumococcal disease, bacteremia, malaria, and tuberculosis across different populations.
  • A highly significant protective effect (overall P = 9.6 x 10(-8)) was observed in the combined study group (N = 6,106).
  • The Mal S180L variant was found to attenuate TLR2 signal transduction, suggesting a mechanism for its protective effect.

Conclusions:

  • The Mal S180L variant confers significant protection against multiple common infectious diseases.
  • This genetic variation impacts innate immunity by modulating TLR2 signaling.
  • The findings suggest that genetic factors play a substantial role in determining susceptibility to infectious diseases.

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