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Journal of Clinical Microbiology, December 2000, p. 4315-4319, Vol. 38, No. 12
0095-1137/00/$04.00+0

Rapid Genotyping of Varicella-Zoster Virus Vaccine and Wild-Type Strains with Fluorophore-Labeled Hybridization Probes

Vladimir N. Loparev,* Karen McCaustland, Brian P. Holloway, Philip R. Krause, Michiko Takayama, and D. Scott Schmid

Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333

Received 5 July 2000/Returned for modification 17 August 2000/Accepted 21 September 2000

We developed a single-tube rapid method for the detection and differentiation of varicella-zoster virus (VZV) vaccine and wild-type strains that combines rapid-cycle PCR with wild-type-specific fluorescent probe melting profiles for product genotyping. A region including the polymorphic site in VZV open reading frame (ORF) 62 was amplified in the presence of two fluorescence-labeled hybridization probes. During the annealing step of the thermal cycling, both probes bound to their complementary sequences in the amplicon, resulting in resonance energy transfer, thus providing real-time fluorescence monitoring of PCR. Continuous acquisition of fluorescence data during a melting curve analysis at the completion of PCR revealed that loss of fluorescence occurred in a strain-specific manner as the detection probe, which was fully complementary to the wild-type VZV ORF 62 region, melted off the template. Use of this method allowed genotyping of samples within minutes after the completion of PCR, eliminating the need for post-PCR sample manipulation. In addition to reducing the time required to produce a result, this method substantially reduces the risk of contamination of the final product as well as the risk of sample tracking errors. The genotypes of 79 VZV-positive samples determined by this fluorescent resonance energy transfer (FRET) method were identical to the genotypes obtained by conventional PCR and restriction fragment length polymorphism analysis. The genotyping of VZV strains by the FRET method is a rapid and reliable method that is suitable for typing and that is also practical for use for the processing of large numbers of specimens.

* Corresponding author. Mailing address: Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333. Phone: (404) 639-4040. Fax: (404) 639-4056. E-mail: vnl0{at}cdc.gov.

Journal of Clinical Microbiology, December 2000, p. 4315-4319, Vol. 38, No. 12
0095-1137/00/$04.00+0


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