Product-enhanced reverse transcriptase assay for replication-competent retrovirus and lentivirus detection

Area of Science:

• Virology
• Molecular Biology
• Biotechnology

Background:

• Reverse transcriptase (RT) activity is crucial for retroviral replication.
• Detecting replication-competent retrovirus (RCR) and lentivirus (RCL) is vital for retroviral vector safety.
• Existing RCR and RCL detection methods require rigorous comparison with newer assays.

Purpose of the Study:

• To assess the product-enhanced reverse transcriptase (PERT) assay for RCR and RCL detection in retroviral vectors.
• To compare the PERT assay's sensitivity and reliability against established RCR and RCL detection methods.

Main Methods:

• The PERT assay was used to detect RCR and RCL contaminants in lentiviral and retroviral vectors.
• PERT assay results were compared with p24gag ELISA/gag PCR for RCL detection.
• PERT assay results were compared with the S+/L- assay for RCR detection.

Main Results:

• The PERT assay demonstrated sensitivity comparable to p24gag ELISA and gag PCR for detecting replication-competent HIV-1.
• Both the PERT assay and the extended S+/L- assay detected 1 IU of replication-competent GALV and RD114 viruses.
• The PERT assay proved effective for RCR and RCL testing across various retroviral vector types.

Conclusions:

• The PERT assay is a sensitive and reliable method for detecting RCR and RCL in retroviral vectors.
• The PERT assay's performance is consistent across different vector structures, sequences, and envelopes.
• PERT assay offers a versatile tool for ensuring the safety of retroviral vectors used in research and therapy.