A real-time PCR (RT-PCR) assay was developed based on fluorescence resonance energy transfer (FRET) hybridization probe technology, allowing very sensitiveand specific detection of HPV-6 and HPV-11, ...reliable differentiation of HPV-6 and HPV-11, as well as prototypic and non-prototypic HPV-6 genomic variants, in a single PCR reaction. The primers and probe were designed on thebasis of multiple alignments of 74 HPV-6 E2 gene sequences and 20 HPV-11 E2gene sequences. Testing on defined plasmid standards showed that the RT-PCR allowed simple and reliable identification of HPV-6 and HPV-11 using type specific amplification followed by probe-specific post-amplification dissociation analysis. Sensitivity, assessed by probit analysis at a 95% detection level, was 42.9, 43.4, and 25.3 DNA copies per assay for prototypic and non-prototypic HPV-6 variants and HPV-11, respectively. The results obtained by the developed assay on 51 HPV DNA-negative samples and 149 HPV DNA-positive samples, including 81 HPV-6 positive samples (19 prototypic and 62 non-prototypic HPV-6 variants), 28 HPV-11 positive samples, 10 samples of HPV-44 and HPV-74 (the closest relatives of HPV-6 and HPV-11) and 30 samples of 15 other important alpha HPV, showed complete agreement with those obtainedwith the INNO-LiPA human papillomavirus (HPV) Genotyping Assay and HPV-6 E2 and E6 gene sequencing.
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