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Background: Unbiased deep sequencing offers the potential for improved adventitious virus screening in vaccines and biotherapeutics. Successful implementation of such assays will require appropriate control materials to confirm assay performance and sensitivity.
Methods: A common reference material containing 25 target viruses was produced and 16 laboratories were invited to process it using their preferred adventitious virus detection assay.
Results: Fifteen laboratories returned results, obtained using a wide range of wet-lab and informatics methods. Six of 25 target viruses were detected by all laboratories, with the remaining viruses detected by 4-14 laboratories. Six non-target viruses were detected by three or more laboratories.
Conclusion: The study demonstrated that a wide range of methods are currently used for adventitious virus detection screening in biological products by deep sequencing and that they can yield significantly different results. This underscores the need for common reference materials to ensure satisfactory assay performance and enable comparisons between laboratories.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4823300 | PMC |
http://dx.doi.org/10.1016/j.vaccine.2015.12.020 | DOI Listing |
Viruses
August 2025
School of Plant Sciences, The University of Arizona, 1140 E South Campus Drive, Tucson, AZ 85721, USA.
Witches' broom disease of blue palo verde () was reported more than sixty years ago. Characteristic symptoms consist of dense clusters of shortened, brittle branches and stunted leaves. The suspect causal agent has been identified as palo verde broom virus (PVBV), genus, , family, .
View Article and Find Full Text PDFPlants (Basel)
July 2025
Key Laboratory of Quality and Safety Control for Subtropical Fruit and Vegetable, Ministry of Agriculture and Rural Affairs, College of Horticulture Science, Zhejiang A&F University, Hangzhou 311300, China.
Genetic transformation is an essential tool for investigating gene function and editing genomes. Kiwifruit, recognized as a significant global fresh fruit crop, holds considerable economic and nutritional importance. However, current genetic transformation techniques for kiwifruit are impeded by low efficiency, lengthy culture durations (a minimum of six months), and substantial labor requirements.
View Article and Find Full Text PDFMol Ther Methods Clin Dev
June 2025
Center for Biomedical Innovation, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Recent regulatory guidance now encourages the use of sequencing as an alternative adventitious agent testing assay to lengthy compendial assays used for cell line qualification. Most short-read sequencing assays, however, still require over a week to obtain a final test result since the sequencing must be completed before bioinformatic analysis can begin, which is still too long for some cell and gene therapy products that must be released as soon as possible to reach critically ill patients. Oxford Nanopore sequencing can address these issues, as it provides real-time basecalling and sequence alignment, which can reduce the overall assay time.
View Article and Find Full Text PDFmSphere
July 2025
Division of Viral Products, Office of Vaccines Research and Review, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, USA.
All biological products are required to demonstrate the absence of adventitious viruses (AVs), which may be inadvertently introduced at different steps involved in the manufacturing process. The currently recommended and virus detection assays have limitations for broad detection and are lengthy and laborious. Additionally, the use of animals is discouraged by the global 3 R's initiative for replacement, reduction, and refinement.
View Article and Find Full Text PDFBiotechnol Bioeng
August 2025
Life Scientia Ltd., Yokohama, Kanagawa, Japan.
A viral contamination model for steady-state perfusion cell culture was developed to assess how sampling frequency and volume impacted the expected downstream viral clearance factor in integrated continuous biomanufacturing processes. The model used population balance rate equations for cells and free virions, incorporating the virus infection cycle. It simulated the states of cell cultures for both endogenous viruses, which are potentially present within the cells and can be released from them, and adventitious viruses after contamination.
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