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Intradermal Inoculation of Mycobacterium avium in the Mouse Ear
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Genetic research about Mycobacterium avium complex.

Kenji Ogawa1

  • 1Department of Clinical Research/Respiratory Disease, National Hospital Organization Higashi Nagoya National Hospital, Aichi, Japan. ogawak@toumei.hosp.go.jp

Kekkaku : [Tuberculosis]
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This study evaluated genetic typing methods for Mycobacterium avium complex (MAC) infections. MATR-VNTR showed superior discriminatory power for M. avium genotyping, and a novel ARMS-PCR method rapidly detects clarithromycin resistance in MAC.

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Area of Science:

  • Microbiology
  • Genetics
  • Infectious Diseases

Background:

  • Mycobacterium avium complex (MAC) causes pulmonary infections.
  • Accurate genetic typing and resistance detection are crucial for managing MAC infections.

Purpose of the Study:

  • To compare genotyping methods for M. avium.
  • To characterize genetic features of Japanese M. avium isolates.
  • To develop and evaluate a rapid method for detecting clarithromycin resistance in MAC.
  • To develop and evaluate a VNTR analysis for M. intracellulare genotyping.

Main Methods:

  • Comparative analysis of MATR-VNTR, IS1245-RFLP, and MIRU-VNTR for M. avium genotyping.
  • Insertion sequence (IS) analysis, including IS901 and novel ISMav6 identification.
  • DNA sequencing and ARMS-PCR for detecting CAM resistance-associated mutations.
  • Bioinformatics and VNTR analysis for M. intracellulare genotyping.

Main Results:

  • MATR-VNTR demonstrated the highest discriminatory power (HGDI 0.990) for M. avium.
  • Japanese M. avium isolates were identified as M. avium subsp. hominissuis, with a high prevalence of IS901 carriers (70%) and a novel insertion sequence, ISMav6.
  • ARMS-PCR accurately detected CAM resistance with 84.6% sensitivity and 100% specificity, offering rapid results.
  • A stable and highly discriminatory VNTR analysis (HGDI 0.988) was developed for M. intracellulare.

Conclusions:

  • MATR-VNTR is the preferred method for M. avium genotyping.
  • Japanese M. avium isolates possess unique genetic characteristics.
  • ARMS-PCR is a valuable tool for rapid detection of clarithromycin resistance in MAC.
  • The developed VNTR analysis is effective for M. intracellulare genotyping and recurrence investigations.