Affiliation:
1. Forschungszentrum Borstel, National Reference Center for Mycobacteria, D-23845 Borstel, Germany
2. MRC Centre for Molecular and Cellular Biology, Department of Medical Biochemistry, University of Stellenbosch, Tygerberg 7505, South Africa
Abstract
ABSTRACT
Mycobacterium tuberculosis
strains of the Beijing genotype were first identified in China and neighboring countries and have attracted special attention due to their global emergence and association with drug resistance. To further analyze the spread and special characteristics of Beijing genotype strains, accurate, rapid and sensitive methods that overcome the drawbacks of the classical methods such as IS
6110
DNA fingerprinting or spoligotyping for the identification of strains of this genotype are needed. Based on the nucleotide sequences of
M. tuberculosis
SAWC0780 and H37Rv, primers and fluorogenic 5′ nuclease (TaqMan) probes for real-time PCR assays specific for Beijing and non-Beijing strains, respectively, were designed. The detection limits for the real-time PCR assays were about 5 and 10 copies of chromosomal DNA, respectively. In mixtures of Beijing and non-Beijing DNA, a multiplex assay was able to detect (i) one copy of Beijing DNA in approximately 1,000 copies of non-Beijing DNA and (ii) one copy of non-Beijing DNA in approximately 2,000 copies of Beijing DNA. In a blinded analysis of a collection of 103 multidrug-resistant strains isolated in Germany in 2001, all 62 Beijing and all 41 non-Beijing strains were correctly identified. In conclusion, the real-time assay allows for the rapid and specific detection of Beijing and non-Beijing strains. The major advantages of this test in comparison to other methods used for the identification of Beijing strains are its simplicity and sensitivity and the fact that amplification and detection occur within one reaction tube.
Publisher
American Society for Microbiology
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