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Detection of infectious bovine polyomavirus
Carron Nairn1, Archie Lovatt, Daniel N Galbraith
1Q-One Biotech Limited, Todd Campus, West of Scotland Science Park, Glasgow, G20 0XA, UK. cnairn@q-one.co.uk
Summary
Bovine polyomavirus (BPyV) can contaminate human therapies via fetal bovine serum. This study developed a new assay to detect infectious BPyV, ensuring safer biotechnological products.
Area of Science:
- Virology
- Molecular Biology
- Biotechnology
Background:
- Bovine polyomavirus (BPyV) contamination in fetal bovine serum poses a significant risk to the biotechnology industry and human therapeutic products.
- Existing PCR assays detect BPyV sequences but cannot differentiate between infectious and non-infectious viral particles.
- The origin of BPyV was confirmed as bovine, not simian, with primate cultures being contaminated via bovine serum.
Purpose of the Study:
- To develop and validate a novel assay capable of detecting infectious Bovine polyomavirus (BPyV).
- To distinguish between replicating and non-replicating BPyV in cell cultures and serum samples.
- To assess the potential for BPyV contamination in biotechnological products derived from bovine sources.
Main Methods:
- Development of an in vitro amplification system coupled with PCR to detect infectious BPyV.
- Utilized a lengthy bovine cell culture period to allow for viral replication prior to detection.
- Employed electron microscopy to visualize viral particles within infected bovine kidney cells.
- Conducted mock-test and spiked serum assays to validate the BPyV detection assay's specificity and sensitivity.
Main Results:
- The developed assay successfully detected infectious BPyV after a culture period, distinguishing it from non-replicating forms.
- Mock-test assays using BPyV-positive fetal bovine serum showed no evidence of replicating BPyV.
- Spiked serum controls confirmed the assay's ability to detect replication and demonstrated that serum did not inhibit viral replication.
- Electron microscopy confirmed the presence of intact BPyV-like particles (40-50nm) within the nucleus of infected bovine kidney cells.
Conclusions:
- A reliable assay for detecting infectious BPyV has been successfully developed.
- This assay is crucial for mitigating the risk of BPyV contamination in human therapeutics derived from bovine sources.
- The findings underscore the importance of rigorous screening of raw materials like fetal bovine serum in the biotechnology sector.