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Variable host-pathogen compatibility in Mycobacterium tuberculosis

Sebastien Gagneux1, Kathryn DeRiemer, Tran Van

  • 1Institute for Systems Biology, Seattle, WA 98103, USA. sgagneux@systemsbiology.org

Proceedings of the National Academy of Sciences of the United States of America
|February 16, 2006
PubMed

Insights

Mycobacterium tuberculosis lineages show distinct global population structures linked to specific human groups. These findings suggest pathogen adaptation to human populations, impacting tuberculosis control and vaccine strategies.

Area of Science:

  • Genetics
  • Evolutionary biology
  • Epidemiology

Background:

  • Mycobacterium tuberculosis is a global health threat.
  • Human pathogens often exhibit population genetics structured by human migrations.
  • The evolutionary impact of long-term human-pathogen associations remains understudied.

Purpose of the Study:

  • To investigate the global population structure of Mycobacterium tuberculosis.
  • To explore the evolutionary consequences of human-pathogen associations.
  • To determine if M. tuberculosis lineages are adapted to specific human populations.

Main Methods:

  • Phylogeographical analysis of M. tuberculosis global population structure.
  • Correlation of M. tuberculosis lineages with sympatric and allopatric human populations.
  • Assessment of tuberculosis transmission dynamics in diverse host populations.

Main Results:

  • Six distinct phylogeographical lineages of M. tuberculosis were identified globally.
  • Each lineage was associated with specific, sympatric human populations.
  • M. tuberculosis spread more efficiently in sympatric than allopatric hosts.
  • Tuberculosis in allopatric hosts disproportionately affected individuals with compromised immunity.

Conclusions:

  • Mycobacterium tuberculosis lineages exhibit adaptation to particular human populations.
  • Findings suggest co-evolutionary relationships between M. tuberculosis and humans.
  • Implications for tuberculosis control strategies and vaccine development are significant.

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