Rapid genotyping of human papillomavirus by post-PCR array-based hybridization techniques

Area of Science:

• Molecular Biology
• Genotyping Technologies
• Biotechnology

Background:

• Microarray-based hybridization is crucial for genotyping.
• Current methods often rely on endpoint measurements, limiting data richness.
• A need exists for more informative and sensitive microarray hybridization techniques.

Purpose of the Study:

• To develop and validate a novel method for kinetic hybridization measurements on microarrays.
• To assess the utility of this method for detecting human papillomavirus (HPV) subtypes.
• To compare the performance of the new method against established techniques like PCR and reverse line blot (RLB).

Main Methods:

• A flow-through microarray system was designed, enabling repeated pumping of PCR products through a porous substrate.
• Fluorescently labeled PCR products were measured after each pumping cycle to obtain binding and melting curves.
• The method was tested using 20 HPV subtypes and 216 clinical samples, with results compared to RLB and EIA.

Main Results:

• The flow-through microarray method successfully performed real-time hybridization and high-resolution melting curve analysis for low-concentration HPV targets.
• The method demonstrated high agreement (93%, κ = 0.88) with the reference RLB method.
• Kinetic binding and melting curve data allowed for the identification of false-positive samples, highlighting the method's precision.

Conclusions:

• Kinetic hybridization measurements on microarrays offer a valuable advancement for genotyping applications.
• The developed flow-through method provides richer data (binding and melting curves) than endpoint measurements.
• This technique shows significant promise for accurate and sensitive detection of pathogens like HPV, especially for closely related targets.