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Preparation of Mycobacterium tuberculosis Culture Filtrate to Understand TB Pathogenesis
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Cyclic di-GMP mediates Mycobacterium tuberculosis dormancy and pathogenecity.

Yuzhi Hong1, Xiaodan Zhou, Haihong Fang

  • 1School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, China.

Tuberculosis (Edinburgh, Scotland)
|October 2, 2013
PubMed
Summary

Cyclic di-GMP (c-di-GMP) signaling negatively regulates Mycobacterium tuberculosis dormancy and pathogenicity. Disrupting c-di-GMP synthesis or degradation impacts bacterial survival and virulence in vitro and in vivo.

Keywords:
Cyclic di-GMPDormancyMycobacterium tuberculosisPathogenicitySignaling

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Published on: June 30, 2016

Area of Science:

  • Microbiology
  • Molecular Biology
  • Pathogenesis

Background:

  • Tuberculosis remains a global health challenge, often linked to Mycobacterium tuberculosis dormancy.
  • Understanding the molecular basis of M. tuberculosis dormancy is crucial for developing effective treatments.
  • The role of cyclic di-GMP (c-di-GMP) signaling in bacterial dormancy is not fully elucidated.

Purpose of the Study:

  • To investigate the role of cyclic di-GMP (c-di-GMP) synthesis and degradation genes in M. tuberculosis dormancy.
  • To determine the impact of c-di-GMP signaling on M. tuberculosis survival, growth recovery, and pathogenicity.
  • To explore the transcriptional changes associated with altered c-di-GMP levels during dormancy.

Main Methods:

  • Generated single-gene deletion mutants for cyclic di-GMP synthesis (dgc) and degradation (pde) in M. tuberculosis H37Rv.
  • Assessed dormancy phenotypes using in vitro models triggered by anaerobiosis and vitamin C.
  • Analyzed transcriptomes of wild-type and mutant strains under aerobic and anaerobic conditions.
  • Evaluated bacterial infectivity using THP-1 cells and pathogenicity in a C57BL/6 mouse model.

Main Results:

  • The dgc mutant showed increased dormancy, while the Δpde mutant exhibited reduced dormancy in vitro.
  • Transcriptomic analysis revealed significant differences in gene expression during anaerobic dormancy, including novel genes outside the dosR regulon.
  • The Δpde mutant displayed decreased infectivity in THP-1 cells and attenuated pathogenicity in mice.
  • Aerobic growth phenotypes were similar across wild-type and mutant strains.

Conclusions:

  • Cyclic di-GMP (c-di-GMP) signaling negatively regulates Mycobacterium tuberculosis dormancy.
  • Modulation of c-di-GMP levels affects bacterial survival, recovery from dormancy, and virulence.
  • These findings provide insights into novel mechanisms controlling M. tuberculosis persistence and suggest potential therapeutic targets.