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Characterization and functional investigation of single nucleotide polymorphisms (SNPs) in the human TLR5 gene

Sabine Merx1, Wilma Zimmer, Michael Neumaier

  • 1Institute for Clinical Chemistry, University Hospital Mannheim, Mannheim, Germany.

Human Mutation
|February 14, 2006
PubMed

Insights

Toll-like receptor 5 (TLR5) gene variations impact bacterial infection susceptibility. Functional analysis identified three single nucleotide polymorphisms (SNPs) in TLR5, with R392X being the most prevalent, potentially influencing disease risk.

Area of Science:

  • Immunology
  • Genetics

Background:

  • Toll-like receptors (TLRs) are crucial for innate immunity, recognizing pathogen-associated molecular patterns (PAMPs).
  • TLR5 specifically detects bacterial flagellin, a key component of flagellated bacteria.
  • A known TLR5 R392 stop polymorphism is linked to inflammatory conditions and increased susceptibility to Legionella pneumophila pneumonia.

Purpose of the Study:

  • To functionally characterize known single nucleotide polymorphisms (SNPs) in the TLR5 gene.
  • To assess the clinical relevance of TLR5 polymorphisms beyond the R392X variant.

Main Methods:

  • Transient transfection of CHO-K1 cells with various TLR5 single nucleotide polymorphisms (SNPs).
  • Functional assessment of TLR5 variants upon stimulation.
  • Prevalence analysis of identified functional SNPs in a healthy donor cohort.

Main Results:

  • Three missense TLR5 SNPs (p.R392X, p.D694G, and p.L822F) were identified as functionally relevant.
  • The p.R392X variant showed a prevalence of 11.9% in healthy donors.
  • The p.D694G and p.L822F variants were found to be of low frequency in the Caucasian population.

Conclusions:

  • Functional characterization of TLR5 SNPs is essential for understanding their role in disease.
  • The p.R392X TLR5 variant is common and may contribute to disease susceptibility.
  • Further research on combinations of TLR5 SNPs and other TLRs could clarify their impact on human health and aid clinical diagnosis.

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