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Targeted Next-generation Sequencing and Bioinformatics Pipeline to Evaluate Genetic Determinants of Constitutional Disease
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ATG16L1 polymorphisms are associated with NOD2-induced hyperinflammation.

Theo S Plantinga1, Leo A B Joosten, Mihai G Netea

  • 1Department of Medicine, and Nijmegen Institute for Infection, Inflammation and Immunity (N4i), Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.

Autophagy
|June 16, 2011
PubMed
Summary

Genetic variants in autophagy genes like ATG16L1 are linked to Crohn's disease. While the risk variant impairs immune cell autophagy and bacterial clearance, it doesn't fully explain the disease's inflammation.

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Area of Science:

  • Immunology
  • Genetics
  • Gastroenterology

Background:

  • Crohn's disease pathogenesis involves genetic susceptibility, particularly genes regulating autophagy.
  • Key genes identified include ATG16L1 and IRGM, crucial for cellular self-cleaning processes.

Purpose of the Study:

  • To investigate the functional impact of the ATG16L1 Thr300Ala polymorphism (rs2241880) on innate immune responses in Crohn's disease.
  • To elucidate the mechanism linking genetic variants to Crohn's disease pathology.

Main Methods:

  • Functional studies examining the capacity of innate immune cells with the ATG16L1 risk variant to perform autophagy.
  • Analysis of autophagy induction triggered by microbial structures like peptidoglycans recognized by NOD2.

Main Results:

  • The ATG16L1 Thr300Ala risk variant reduces autophagy induction in innate immune cells upon stimulation with microbial products.
  • Impaired autophagy leads to diminished autophagosome formation and antigen presentation via MHC, resulting in decreased immune activation.
  • This suggests defective host defense and potential bacterial persistence in the gut mucosa.

Conclusions:

  • The ATG16L1 300Ala variant is associated with impaired autophagy and reduced immune activation, potentially leading to bacterial persistence.
  • However, these findings do not fully account for the excessive inflammation characteristic of Crohn's disease.