Targeted hybridization of IS6110 fingerprints identifies the W-Beijing Mycobacterium tuberculosis strains among clinical isolates

Natalia Kurepina, Ekaterina Likhoshvay, Elena Shashkina, Barun Mathema, Kristin Kremer, Dick Van Soolingen, Pablo Bifani, Barry N. Kreiswirth

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Targeted IS6110-based RFLP genotyping can be applied to rapidly identify specific groups of biomedically/epidemiologically relevant Mycobacterium tuberculosis clinical isolates. One such group is the W-Beijing strain family (also known as Beijing/W), implicated in significant nosocomial and community outbreaks worldwide. Using previously defined criteria, we developed a simple and accurate method to identify members of the W-Beijing family, based on rehybridization of Southern blot membranes used previously in routine IS6110 DNA fingerprint analysis. The hybridization probe constructed ("W-Beijing polyprobe") contains the PCR-amplified fragments specific for three M. tuberculosis chromosomal loci used for the identification of W-Beijing strains. The targets include the dnaA-dnaN and NTF regions and the direct repeat locus. A total of 526 selected clinical isolates (representative of 253 different IS6110-defined strain types) were analyzed using the W-Beijing polyprobe. A total of 148 isolates from this collection were found to be members of the W-Beijing phylogenetic lineage, comprising 106 strains from the W-Beijing family (46 clusters) and 42 related isolates. Rehybridization results were confirmed by computer-assisted analysis. The sensitivity and specificity of this method were estimated at 98.7% and 99.7%, respectively. This study demonstrates that the W-Beijing polyprobe can accurately and reliably discriminate members of the W-Beijing phylogenetic lineage and the W-Beijing family of M. tuberculosis strains.

Original languageEnglish (US)
Pages (from-to)2148-2154
Number of pages7
JournalJournal of clinical microbiology
Issue number5
StatePublished - May 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Microbiology (medical)


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