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Related Experiment Videos

Ecotypes of the Mycobacterium tuberculosis complex.

Noel H Smith1, Kristin Kremer, Jacqueline Inwald

  • 1TB Research Group, Veterinary Laboratories Agency, VLA, Addlestone, Surrey KT15 3NB, UK. Noel@Sussex.ac.uk

Journal of Theoretical Biology
|October 26, 2005
PubMed
Summary

Animal-adapted Mycobacterium tuberculosis strains form a single lineage (RD9 deleted). Specific spoligotype spacers within this lineage help identify host-adapted strains, particularly those adapted to antelopes.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genetics

Background:

  • The Mycobacterium tuberculosis complex (MTBC) exhibits diverse host adaptations.
  • Animal-adapted MTBC strains are phylogenetically grouped within a lineage defined by the deletion of chromosomal region 9 (RD9).

Purpose of the Study:

  • To investigate the phylogenetic utility of spoligotype patterns within the RD9-deleted MTBC lineage.
  • To identify and characterize further antelope-adapted MTBC strains using spoligotype data.
  • To explore the application of the ecotype concept to MTBC evolution.

Main Methods:

  • Analysis of spoligotype patterns from RD9-deleted MTBC strains.
  • Screening of a large spoligotype database using phylogenetically informative spacers.
  • Comparison of spoligotype-based findings with existing phylogenetic data from chromosomal deletions and single nucleotide mutations.

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Main Results:

  • Specific spoligotype spacers (3, 9, 16, 39, 40-43) are phylogenetically informative within the RD9-deleted lineage.
  • Identification of additional MTBC strains host-adapted to antelopes.
  • Spoligotype data are congruent with chromosomal deletion phylogeny, suggesting limited recombination.
  • Phylogenetic markers can delineate clades with distinct host preferences within the RD9-deleted lineage.

Conclusions:

  • Spoligotype spacers are valuable tools for understanding MTBC evolution and host adaptation.
  • The RD9-deleted lineage represents a series of host-adapted ecotypes within the MTBC.
  • The ecotype concept provides a useful framework for describing MTBC diversity.