High throughput detection of retrovirus-associated reverse transcriptase using an improved fluorescent product...

Area of Science:

• Molecular Biology
• Virology
• Biotechnology

Background:

• Reverse transcriptase (RT) activity is crucial for retroviral replication.
• Distinguishing retroviral RT from DNA polymerase activity is essential for accurate detection.
• Existing methods may lack sensitivity or specificity in identifying retroviral RT.

Purpose of the Study:

• To develop and validate a novel, sensitive assay for retroviral RT detection.
• To differentiate genuine retroviral RT activity from DNA polymerase-associated RT-like activity.
• To enable quantification of retroviruses in various biological samples.

Main Methods:

• Development of a TaqMan fluorescent probe-based product-enhanced RT test (F-PERT).
• Inclusion of activated calf-thymus DNA to suppress DNA polymerase activity.
• Linear regression analysis to correlate threshold cycle (C(T)) with virus particle number.

Main Results:

• The F-PERT assay successfully discriminated between retroviral RT and DNA polymerase activity.
• A linear relationship was established between C(T) values and retroviral load.
• The assay detected RT activity from various retroviruses (PoERV, MLV, SFV, SIVmac, SMRV) with high sensitivity (approx. 100 virions).
• RT activity was detected in specific cell line supernatants (C1271, Mus dunni, K-Balb, BHK-21, CHO-K1, SP2/0-Ag14, NSO, Sf9).

Conclusions:

• The F-PERT assay is a sensitive and specific tool for detecting and quantifying retroviral RT activity.
• This method effectively suppresses interfering DNA polymerase activity.
• The assay has broad applicability for detecting diverse retroviruses across different cell types.