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Identification of Mycobacterium Species by DNA Microarray Chip Method
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Published on: June 24, 2025

Mycobacterium microti: More diverse than previously thought.

N H Smith1, T Crawshaw, J Parry

  • 1VLA Weybridge, New Haw, Surrey, United Kingdom. Noel@Sussex.ac.uk

Journal of Clinical Microbiology
|June 19, 2009
PubMed
Summary

Mycobacterium microti, a tuberculosis complex bacterium, shows greater diversity than previously known. This study identified M. microti in British cats, suggesting a spillover from wild mammals like voles.

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Area of Science:

  • Bacteriology
  • Molecular Epidemiology
  • Veterinary Pathology

Background:

  • Mycobacterium microti, part of the Mycobacterium tuberculosis complex, was initially known for limited genetic diversity and a reduced spoligotype pattern.
  • Previous identification relied on specific chromosomal DNA deletions, notably the absence of region RD1(mic).

Purpose of the Study:

  • To characterize the molecular features of Mycobacterium tuberculosis complex strains isolated in Great Britain over 14 years.
  • To investigate the diversity, sources, and geographical distribution of Mycobacterium microti strains.
  • To describe the pathology of M. microti infection in domestic cats and propose its epidemiological origins.

Main Methods:

  • Molecular analysis of 141 Mycobacterium tuberculosis complex strains using spoligotyping and variable-number tandem-repeat (VNTR) typing (ETR-E, ETR-F loci).
  • Detection of specific chromosomal DNA deletions (RD7, RD9, RD1(mic)) and intact regions (RD4, RD12).
  • Epidemiological investigation correlating strain types with isolation sources (domestic cats) and geographical locations.

Main Results:

  • Identified strains as Mycobacterium microti based on characteristic spoligotype spacer losses and VNTR alleles, and specific chromosomal deletions.
  • Demonstrated significantly greater diversity in spoligotype patterns and VNTR types for M. microti than previously reported.
  • Domestic cats were the most common source; M. microti strains showed geographical localization similar to Mycobacterium bovis in cattle.
  • Described pathology of M. microti infection in cats, suggesting a spillover from an unknown wild mammal reservoir (likely field voles).

Conclusions:

  • Mycobacterium microti exhibits more genetic diversity than previously understood, challenging earlier characterizations.
  • Domestic cats serve as a significant host for M. microti in Great Britain, with infections likely originating from wild mammal populations.
  • The geographical distribution of M. microti strains in cats does not overlap with Mycobacterium bovis strains in cattle, indicating distinct epidemiological patterns.