A Fluorescent Real-Time Plaque Assay Enables Single-Cell Analysis of Virus-Induced Cytopathic Effect by Live-Cell...

Area of Science:

• Virology
• Cell Biology
• Microscopy

Background:

• Conventional plaque assays are time-consuming and subjective.
• Plaques are viral-induced cytopathic effects, crucial for viral quantification.
• Existing methods require several days for plaque visualization and counting.

Purpose of the Study:

• To develop a faster, more accurate method for visualizing and quantifying viral plaques.
• To enable real-time monitoring of viral cytopathic effects.
• To improve plaque analysis for antiviral and cytotoxic compound screening.

Main Methods:

• Applied DNA fluorescent dyes with differential cell permeability for live-cell imaging.
• Utilized modern fluorescence microscopy and image analysis.
• Observed cytopathic effects in real-time during viral replication.

Main Results:

• Visualized distinct stages of viral cytopathic effect including chromatin condensation and cell membrane permeabilization.
• Achieved automated plaque identification with increased resolution compared to traditional methods.
• Demonstrated the assay's utility in plaque tracking and plaque reduction assays.

Conclusions:

• The fluorescent real-time plaque assay offers a significant advancement over conventional methods.
• This technique enhances plaque resolution, enables automation, and speeds up viral quantification.
• It provides a robust platform for future applications in virology, including drug discovery.