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Isolation of a DNA probe for identification of Mycobacterium kansasii, including the genetic subgroup

M Yang1, B C Ross, B Dwyer

  • 1Infectious Diseases Department, First Affiliated Hospital, Suzhou Medical College, People's Republic of China.

Journal of Clinical Microbiology
|October 1, 1993
PubMed

Insights

A novel DNA probe, p6123, successfully identified 100% of Mycobacterium kansasii clinical isolates. This probe offers superior accuracy for developing new DNA-based diagnostic assays for this bacterium.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Medical Diagnostics

Background:

  • Mycobacterium kansasii is a significant pathogen requiring accurate identification.
  • Existing DNA probes for M. kansasii have limitations in sensitivity and specificity.
  • Development of a comprehensive DNA-based assay is crucial for clinical diagnostics.

Purpose of the Study:

  • To isolate and characterize a specific DNA probe for identifying all clinical isolates of Mycobacterium kansasii.
  • To evaluate the diagnostic performance of the novel probe compared to existing methods.

Main Methods:

  • Isolation of a specific DNA probe (p6123) from M. kansasii.
  • DNA hybridization assays using the p6123 probe on 145 clinical M. kansasii isolates.
  • Comparison with a previously described probe (pMK1-9) and a commercial assay (Accu-probe).
  • Southern blot analysis to investigate DNA fragment patterns.

Main Results:

  • The p6123 probe achieved 100% identification of all 145 M. kansasii isolates tested.
  • Previous probes identified 79% (pMK1-9) and 88% (Accu-probe) of the isolates.
  • Southern blot analysis revealed distinct DNA fragment patterns differentiating strains.

Conclusions:

  • The p6123 DNA probe is highly specific and sensitive for identifying all tested Mycobacterium kansasii clinical isolates.
  • This probe represents an ideal target for developing advanced DNA-based speciation assays.
  • The findings enhance the potential for accurate and comprehensive diagnostics of M. kansasii infections.

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