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In Vitro Analysis of Myd88-mediated Cellular Immune Response to West Nile Virus Mutant Strain Infection
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Two human MYD88 variants, S34Y and R98C, interfere with MyD88-IRAK4-myddosome assembly

Julie George1, Precious G Motshwene, Hui Wang

  • 1Division Toll-like receptors and Cancer, German Cancer Research Centre DKFZ, Heidelberg, 69120 Germany.

The Journal of Biological Chemistry
|October 23, 2010
PubMed

Insights

MyD88 adaptor protein variants S34Y and R98C impair immune signaling by disrupting Myddosome formation and IRAK4 interaction. These rare variants may increase susceptibility to severe infections in a subset of individuals.

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • MyD88 is a crucial adaptor protein in Toll-like receptor (TLR) and IL-1 receptor superfamily signaling pathways.
  • Naturally occurring MYD88 mutations can lead to life-threatening recurrent infections, highlighting its importance in innate immunity.

Purpose of the Study:

  • To investigate the functional impact of six reported non-synonymous single nucleotide polymorphisms (SNPs) in MYD88.
  • To elucidate the molecular mechanisms by which specific MYD88 variants affect immune signaling pathways.

Main Methods:

  • In vitro cellular system analysis of MYD88 variants.
  • Assessment of NF-κB activation, homo-oligomerization, and IRAK4 interaction.
  • Structural modeling of the Myddosome complex.
  • Epidemiological case-control studies.

Main Results:

  • Two MYD88 variants, S34Y and R98C, located in the death domain (DD), severely reduced NF-κB activation.
  • These variants exhibited reduced homo-oligomerization and IRAK4 interaction, crucial for Myddosome assembly.
  • MyD88 homo-oligomerization and IRAK4 interaction are modulated by non-DD regions, including the TIR and kinase domains.
  • S34Y and R98C differentially affected MyD88-dependent signaling pathways, suggesting Myddosome-level receptor specificities.
  • Epidemiological analysis confirmed S34Y and R98C as rare variants associated with increased infection susceptibility in few individuals.

Conclusions:

  • MyD88 variants S34Y and R98C impair innate immune responses by disrupting Myddosome function.
  • These findings underscore the importance of MyD88's death domain and its interactions for effective immune signaling.
  • The study highlights potential genetic predispositions to severe infections due to rare MYD88 polymorphisms.

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