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Published on: March 8, 2012
Development and validation of a HPV-32 specific PCR assay
Nicholas R Herrel1, Nadia L Johnson, Jennifer E Cameron
1Department of Medicine, Louisiana State University Health Sciences Center, New Orleans, USA. nherre@lsuhsc.edu
Background:
Human Papillomavirus-32 (HPV-32) has traditionally been associated with focal-epithelial-hyperplasia (FEH). It is also present in 58% of oral warts of HIV-positive individuals whose prevalence is increasing. Current methods for the detection of HPV-32 are labor-intensive and insensitive so the goal of this work was to develop a highly sensitive and easy to use specific polymerase chain reaction (PCR) assay.
Materials And Methods:
An HPV-32 L1 specific PCR assay was developed and optimized. The sensitivity and specificity was compared to previous assays utilized for detection (PGMY and MY09/11 PCR with dot blot hybridization) using cloned HPV-32 L1, the closely related HPV-42 L1 as well as clinical samples (oral swabs and fluids from 89 HIV-positive subjects).
Results:
The HPV-32 specific PCR assay showed improved sensitivity to 5 copies of HPV-32 as compared to the PGMY PCR, MY09/11 PCR and dot blot which had a limit of detection of approximately 3,000 copies. Using the HPV-32 dot blot hybridization assay as the gold standard, the HPV-32 specific PCR assay has a sensitivity of 95.8% and 88.9% by sample and subject, respectively, and specificity was 87.8% and 58.8% by sample and subject, respectively. The low sensitivity is due to the HPV-32 specific PCR assays ability to detect more HPV-32 positive samples and may be the new gold standard.
Conclusion:
Due to the ease, sensitivity, and specificity the HPV-32 specific PCR assay is superior to previous assays and is ideal for detection of HPV-32 in large cohorts. This assay provides an excellent tool to study the natural history of HPV-32 infection and the development of oral warts.
Insights
A new Human Papillomavirus-32 (HPV-32) polymerase chain reaction (PCR) assay offers superior sensitivity and ease of use for detecting HPV-32. This advanced PCR method is ideal for large-scale studies on oral warts and HPV-32 infection natural history.
Area of Science:
- Virology
- Molecular Biology
- Infectious Diseases
Background:
- Human Papillomavirus-32 (HPV-32) is linked to focal epithelial hyperplasia and oral warts in HIV-positive individuals.
- Increasing prevalence of HPV-32 necessitates improved detection methods.
- Current HPV-32 detection techniques are labor-intensive and lack sensitivity.
Purpose of the Study:
- To develop a highly sensitive and user-friendly specific polymerase chain reaction (PCR) assay for HPV-32 detection.
- To overcome the limitations of existing HPV-32 detection methods.
Main Methods:
- Developed and optimized an HPV-32 L1 specific PCR assay.
- Compared its sensitivity and specificity against PGMY and MY09/11 PCR with dot blot hybridization.
- Utilized cloned HPV-32 L1, HPV-42 L1, and clinical samples from 89 HIV-positive subjects.
Main Results:
- The new HPV-32 specific PCR assay detected as few as 5 copies of HPV-32, a significant improvement over the ~3,000 copy detection limit of previous methods.
- Achieved 95.8% sensitivity and 87.8% specificity by sample (88.9% sensitivity, 58.8% specificity by subject) when compared to the HPV-32 dot blot hybridization assay.
- The assay's high sensitivity may establish it as a new gold standard for HPV-32 detection.
Conclusions:
- The developed HPV-32 specific PCR assay is superior to existing methods due to its ease of use, high sensitivity, and specificity.
- This assay is well-suited for detecting HPV-32 in large populations.
- It serves as a valuable tool for investigating HPV-32 infection and oral wart development.
