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Related Experiment Videos

An mpb-64 flanking sequence specific for Mycobacterium bovis

J C Fisanotti1, M I Romano, A Alito

  • 1Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria, Moron, Argentina.

Research in Microbiology
|June 1, 1997
PubMed
Summary

A novel DNA region downstream of the mpb-64 gene aids in differentiating Mycobacterium bovis from Mycobacterium tuberculosis. This discovery enables more precise species-level identification within the M. tuberculosis complex.

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Area of Science:

  • Microbiology
  • Genetics
  • Immunology

Background:

  • Screening a Mycobacterium bovis genomic library with cattle sera identified a clone with the mpb-64 gene and flanking sequences (plasmid pMBA122).
  • The mpb-64 gene is a known marker, but its flanking regions were unexplored for diagnostic potential.

Purpose of the Study:

  • To develop a more precise method for differentiating species within the Mycobacterium tuberculosis complex.
  • To investigate the diagnostic utility of the 3' flanking sequences of the mpb-64 gene.

Main Methods:

  • Southern blot analysis using the pMBA122 insert as a probe on PvuII-digested DNA from M. tuberculosis complex species.
  • Smal genomic digestion to locate the polymorphic region downstream of the mpb-64 gene.
  • Polymerase Chain Reaction (PCR) using specific primers designed for the polymorphic region, with varying annealing temperatures.

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Main Results:

  • Southern blots revealed distinct hybridization patterns (7kb for M. tuberculosis, 5kb for M. bovis, 3kb for wild seal strains).
  • PCR primers initially amplified only M. bovis DNA.
  • Lowering the annealing temperature allowed amplification of a homologous fragment from M. tuberculosis, indicating sequence divergence.

Conclusions:

  • The polymorphic region downstream of the mpb-64 gene exhibits lower homology between M. bovis and M. tuberculosis.
  • PCR targeting this specific region offers a promising strategy for precise species-level differentiation within the M. tuberculosis complex.