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Production and Purification of Baculovirus for Gene Therapy Application
Published on: April 9, 2018
Error assessment in recombinant baculovirus titration: evaluation of different methods
António Roldão1, Rui Oliveira, Manuel J T Carrondo
1ITQB-UNL/IBET, Apartado 12, P-2781-901 Oeiras, Portugal.
Journal of Virological Methods
|May 16, 2009
Summary
Accurate baculovirus titration is crucial for reproducible protein expression. This study compared methods, identifying end-point dilution, microculture tetrazolium, and flow cytometry as cost-effective and accurate choices for optimizing viral titers.
Area of Science:
- Biotechnology
- Molecular Biology
- Protein Expression Systems
Background:
- Baculovirus/insect cell systems are vital for heterologous protein expression.
- Process consistency and optimization rely on controlled parameters, especially viral titers.
- Inaccurate viral titers, often due to distinguishing infectious from non-infectious baculovirus, lead to irreproducible results and hinder optimization.
Purpose of the Study:
- To compare various baculovirus titration methods.
- To identify critical parameters influencing titration accuracy, such as incubation time and cell concentration.
- To evaluate methods based on cost, time, and error for optimal performance.
Main Methods:
- Comparison of multiple baculovirus titration techniques.
- Analysis of critical variables: incubation time and cell concentration.
- Cost-effectiveness, time efficiency, and error rate assessment of each method.
Main Results:
- Incubation time and cell concentration significantly impact titer accuracy.
- While standard errors varied (7-36%), titers were generally within the same order of magnitude, suggesting method independence.
- Alamarblue, real-time qPCR, and plaque assays were identified as the most expensive methods.
Conclusions:
- End-point dilution, microculture tetrazolium, and flow cytometry assays offer the best balance of cost, time, and accuracy.
- Defining incubation time and cell concentration is essential for reliable baculovirus titration.
- Confirming titers through comparison with reference stocks or using multiple methods is recommended for accuracy.
