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Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
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Related Experiment Video

Updated: Nov 7, 2025

Deciphering and Imaging Pathogenesis and Cording of Mycobacterium abscessus in Zebrafish Embryos
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Stepwise pathogenic evolution of Mycobacterium abscessus.

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  • 1Molecular Immunity Unit, University of Cambridge Department of Medicine, MRC Laboratory of Molecular Biology, Cambridge, UK.

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Mycobacterium abscessus evolves pathogenicity through horizontal gene transfer and mutations, impacting cystic fibrosis patients. Interventions like early treatment can limit the spread of evolving mycobacterial pathogens.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genetics

Background:

  • Most mycobacteria are environmental saprophytes, but some, like Mycobacterium tuberculosis, cause human disease.
  • The emergence of Mycobacterium abscessus in cystic fibrosis (CF) patients offers insights into mycobacterial pathogenic evolution.

Purpose of the Study:

  • To define generalizable steps in the pathogenic evolution of mycobacteria.
  • To understand the mechanisms driving the increased pathogenicity of environmental mycobacteria in human hosts.

Main Methods:

  • Analysis of the spread and evolution of Mycobacterium abscessus in the global cystic fibrosis population.
  • Investigation of horizontal gene transfer and subsequent genetic mutations influencing virulence.
  • Comparative analysis with Mycobacterium tuberculosis evolution.

Main Results:

  • Epigenetic modifiers acquired via horizontal gene transfer drive significant increases in pathogenic potential.
  • Parallel evolution in chronic lung infections leads to rapid virulence enhancement through specific gene network mutations.
  • Mutations favor intracellular growth (macrophages) but reduce survival on fomites, constraining evolution with indirect transmission.

Conclusions:

  • Pathogenic evolution in mycobacteria involves distinct stages, including acquisition of epigenetic modifiers and adaptation to host environments.
  • Constrained evolution is observed with indirect transmission, but direct transmission (like M. tuberculosis) may accelerate adaptation.
  • Early treatment and infection control are crucial to limit the spread of current and emerging mycobacterial pathogens.