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[Mendelian susceptibility to mycobacterial disease: defects in the IL-12/IFNgamma pathway]

Claire Fieschi1

  • 1Département d'immunologie, Unité d'immunopathologie, Hôpital Saint-Louis, AP-HP, Paris (75). claire.fieschi@sls.aphp.fr

Presse Medicale (Paris, France : 1983)
|May 20, 2006
PubMed

Insights

Mendelian susceptibility to mycobacterial disease involves genetic defects in the interferon gamma/interleukin 12 pathway, leading to infections in healthy individuals. Understanding these genetic mutations aids in comprehending immune responses to mycobacteria and tuberculosis.

Area of Science:

  • Immunology
  • Genetics
  • Infectious Diseases

Context:

  • Mendelian susceptibility to mycobacterial disease (MSMD) is a rare genetic disorder.
  • It causes disseminated infections from normally non-virulent mycobacteria and non-typhoid Salmonella in healthy individuals.
  • MSMD is linked to mutations in genes crucial for the interferon gamma (IFNγ)/interleukin 12 (IL-12) signaling pathway.

Purpose:

  • To describe Mendelian susceptibility to mycobacterial disease.
  • To highlight the genetic basis and molecular mechanisms underlying these conditions.
  • To explore the role of the IFNγ/IL-12 pathway in host defense against mycobacteria and Salmonella.

Summary:

  • MSMD encompasses 12 distinct diseases caused by mutations in 5 genes within the IFNγ/IL-12 immune response loop.
  • Defects in IFNγ pathway signaling predispose individuals to mycobacterial infections.
  • Defects in IL-12 pathway signaling increase susceptibility to systemic non-typhoid salmonellosis, with tuberculosis observed in both pathway defects.

Impact:

  • Elucidating the genetic basis of MSMD enhances understanding of the human immune system's response to mycobacteria.
  • This research provides insights into the genetic underpinnings of tuberculosis and other granulomatous diseases.
  • Identifying genetic defects can inform future diagnostic and therapeutic strategies for infectious diseases.

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