A Simplified Quantitative Real-Time PCR Assay for Monitoring SARS-CoV-2 Growth in Cell Culture.

Area of Science:

• Virology
• Molecular Biology
• Infectious Diseases

Background:

• Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causes significant global health issues.
• Current methods for monitoring SARS-CoV-2 replication in vitro are labor-intensive and expensive due to RNA extraction requirements.
• These limitations hinder rapid progress in basic research and therapeutic development for COVID-19.

Purpose of the Study:

• To develop a simplified quantitative real-time PCR assay for monitoring SARS-CoV-2 growth without RNA extraction.
• To assess the assay's adaptability for other RNA and DNA viruses.
• To screen compounds for antiviral activity against SARS-CoV-2 and HIV-1.

Main Methods:

• Development of a quantitative real-time PCR assay that omits viral RNA extraction.
• Application of the assay to cell culture supernatants for SARS-CoV-2 RNA quantification.
• Proof-of-concept drug screening using the simplified assay against SARS-CoV-2 and HIV-1.

Main Results:

• The simplified assay accurately and sensitively monitors SARS-CoV-2 RNA levels in cell culture supernatants.
• E64D, apilimod, and ethylisopropylamiloride (EIPA) demonstrated potent inhibition of SARS-CoV-2 RNA levels.
• HIV-1 inhibitors showed modest inhibition of SARS-CoV-2 replication, with higher IC50 values compared to HIV-1.

Conclusions:

• The simplified assay significantly expedites SARS-CoV-2 research and drug screening.
• The assay is adaptable to a wide range of RNA and DNA viruses.
• Findings provide insights into SARS-CoV-2 entry pathways and potential therapeutic targets.