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Journal of Clinical Microbiology, May 2002, p. 1617-1620, Vol. 40, No. 5
0095-1137/02/$04.00+0 DOI: 10.1128/JCM.40.5.1617-1620.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
Detection of Ethambutol-Resistant Mycobacterium tuberculosis Strains by Multiplex Allele-Specific PCR Assay Targeting embB306 Mutations
Igor Mokrousov,1* Olga Narvskaya,1 Elena Limeschenko,1 Tatiana Otten,2 and Boris Vyshnevskiy2
Laboratory of Molecular Microbiology, Pasteur Institute, St. Petersburg 197101,1
Laboratory of Microbiology of Tuberculosis, The Research Institute of Phthisiopulmonology, St. Petersburg 193063, Russia2
Received 1 October 2001/
Returned for modification 11 December 2001/
Accepted 12 February 2002
We describe a multiplex allele-specific (MAS)-PCR assay to detect simultaneously mutations in the first and third bases of the embB gene codon 306ATG. These mutations are known to confer ethambutol (EMB) resistance in the majority of clinical Mycobacterium tuberculosis isolates worldwide. The mutated bases are revealed depending on the presence or absence of the respective indicative fragments amplified from the embB306 wild-type allele. Initially optimized on purified DNA samples, the assay was tested on crude cell lysates and auramine-stained sputum slide DNA preparations with the same reproducibility and interpretability of the generated profiles in agarose gel electrophoresis. Since EMB resistance is generally linked to multiple-drug resistance (MDR), the MAS-PCR assay for EMB resistance detection can be used in clinical laboratory practice in areas with a high prevalence and a high transmission rate of MDR-EMB-resistant tuberculosis.
* Corresponding author. Mailing address: Pasteur Institute, 14, Mira St., St. Petersburg, 197101, Russia. Phone: 7-812-233-21-49. Fax: 7-812-232-92-17. E-mail:
miv{at}IM4520.spb.edu.
Journal of Clinical Microbiology, May 2002, p. 1617-1620, Vol. 40, No. 5
0095-1137/02/$04.00+0 DOI: 10.1128/JCM.40.5.1617-1620.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
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