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Use of Interferon-γ Enzyme-linked Immunospot Assay to Characterize Novel T-cell Epitopes of Human Papillomavirus
Published on: March 8, 2012
Real-time PCR-based fluorescent assay for quantitation of human papillomavirus types 6, 11, 16, and 18
R A Tucker1, E R Unger, B P Holloway
1Human Papillomavirus Section, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Public Health Service, US Department of Health and Human Services, Atlanta, GA 30333, USA. ratl@cdc.gov
Background:
Quantitation of human papillomavirus (HPV) DNA in clinical samples may yield important clinical information.
Methods And Results:
We developed a 5' exonuclease fluorescent probe assay for HPV quantitation that uses real-time PCR. The assay was optimized for HPV types 6 (HPV-6), -11, -16, and -18. A multiplex format was developed to quantify a cellular target of known iteration simultaneously with HPV quantitation, which controls for the amount of input DNA. Dilution series of target and heterologous templates were used to verify the assay. The assay was successfully used on fresh and PreservCyt-fixed cell lines, as well as cervical samples. The linear range of the assay is from 10 to 10 million copies. Intraclass correlations for HPV, actin, and globin assays ranged from 0.95 to 0.99, indicating the analytic precision of repeated measures.
Conclusion:
The method is accurate over a large copy number range, reproducible, type specific, normalized for input DNA quantity, and applicable to PreservCyt-fixed material.
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