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TCID50 Assay: A Simple Method to Determine Baculovirus Titer.

Zhihui Zhang1, Xiaoyue Zhang1, Hongying Chen2

  • 1College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, China.

Methods in Molecular Biology (Clifton, N.J.)
|July 1, 2024
PubMed
Summary

This study details the 50% tissue culture infectious dose (TCID50) method for determining baculovirus infectious titer. It involves serial dilutions and monitoring insect cells for cytopathic effects to quantify virus infectivity.

Keywords:
BEVSBaculovirusInfectious virus titerInsect cell cultureTCID50

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Area of Science:

  • Molecular Virology
  • Insect Cell Culture
  • Biotechnology

Background:

  • Accurate quantification of baculovirus infectious titer is crucial for effective gene expression and virus production.
  • Traditional methods for titer determination can be time-consuming and labor-intensive.

Purpose of the Study:

  • To describe a simple and reliable method for determining baculovirus infectious titer.
  • To provide a protocol for calculating baculovirus titer using the TCID50 assay.

Main Methods:

  • The 50% tissue culture infectious dose (TCID50) method was employed.
  • Serial dilutions of baculovirus stock were added to Sf9 insect cells in 96-well plates.
  • Cells were incubated for 3-5 days and monitored for cytopathic effect (cell death).
  • The Reed-Muench method was used for titer calculation.

Main Results:

  • The TCID50 assay provides a quantitative measure of baculovirus infectivity.
  • Cytopathic effects in infected Sf9 cells serve as a reliable indicator of viral activity.
  • The Reed-Muench method allows for the calculation of the virus titer based on observed cell death.

Conclusions:

  • The TCID50 method is a practical approach for determining baculovirus infectious titer.
  • This method facilitates standardized baculovirus stock assessment for research and production.
  • Accurate titer determination is essential for optimizing baculovirus-based applications.