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Modulation of host cell pathways by Coxiella burnetii Dot/Icm effectors

Jingya Yuan1, Yong Zhang1, Lei Song1

  • 1Department of Respiratory Medicine, Center of Infectious Diseases and Pathogen Biology, Key Laboratory of Organ Regeneration and Transplantation of The Ministry of Education, State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases The First Hospital of Jilin University Changchun China.

Mlife
|January 2, 2026
PubMed

Insights

Coxiella burnetii causes Q fever by targeting macrophages. Its virulence relies on the Dot/Icm type IVB secretion system (T4BSS) for intracellular replication.

Area of Science:

  • Microbiology
  • Pathogen Biology
  • Infectious Diseases

Background:

  • Coxiella burnetii is a significant intracellular bacterial pathogen responsible for Q fever.
  • It primarily infects pulmonary alveolar macrophages and can disseminate to other tissues, causing chronic infections.
  • The pathogen infects various host cells, including macrophages, epithelial cells, and fibroblasts.

Purpose of the Study:

  • To review historical milestones and recent advances in understanding the Dot/Icm type IVB secretion system (T4BSS) of C. burnetii.
  • To elucidate the structure and function of the Dot/Icm T4BSS and its delivered effectors.
  • To highlight the importance of understanding host cell exploitation for developing novel therapeutic strategies.

Main Methods:

  • This review synthesizes existing literature on C. burnetii pathogenesis.
  • It focuses on the molecular mechanisms of the Dot/Icm T4BSS.
  • Analysis of effector proteins and their roles in vacuole biogenesis and intracellular replication.

Main Results:

  • The Dot/Icm T4BSS is essential for C. burnetii virulence.
  • This system delivers effector proteins into host cells to modulate cellular pathways.
  • These modulations are critical for the biogenesis of the Coxiella-containing vacuole, supporting intracellular replication.

Conclusions:

  • A comprehensive understanding of the C. burnetii Dot/Icm system and its effectors is crucial.
  • Elucidating pathogen-host interactions is key to developing effective treatments for Q fever.
  • Further research into the Dot/Icm T4BSS will advance therapeutic strategies against C. burnetii infections.
Keywords:
Q feverbacterial virulenceintravacuolar pathogenslysosometype IV secretion

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