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Updated: Jul 27, 2025

Isolation of Fidelity Variants of RNA Viruses and Characterization of Virus Mutation Frequency

Isolation of Fidelity Variants of RNA Viruses and Characterization of Virus Mutation Frequency

Published on: June 16, 2011

Protocol to isolate temperature-sensitive SARS-CoV-2 mutants and identify associated mutations.

Shinya Okamura¹, Akiho Yoshida¹, Paola Miyazato¹

¹Virus Vaccine Group, BIKEN Innovative Vaccine Research Alliance Laboratories, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Suita, Osaka, Japan; The Research Foundation for Microbial Diseases of Osaka University, Suita, Osaka, Japan.

|June 10, 2023

Summary

This study introduces a method to create temperature-sensitive (TS) SARS-CoV-2 strains using chemical mutagenesis. These TS viral strains are crucial for developing safer vaccine candidates and antiviral research.

Keywords:

Microbiology Molecular Biology

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Area of Science:

Virology
Molecular Biology
Genetics

Background:

Viral attenuation is often linked to an inability to replicate at higher temperatures.
Developing safe SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus 2) strains is critical for vaccine and therapeutic research.

Purpose of the Study:

To present a detailed protocol for generating and isolating temperature-sensitive (TS) SARS-CoV-2 strains.
To outline methods for identifying the genetic mutations responsible for the TS phenotype.

Main Methods:

Utilizing 5-fluorouracil-induced mutagenesis to introduce mutations into wild-type SARS-CoV-2.
Employing selection strategies to isolate TS viral clones.
Applying forward and reverse genetics approaches to pinpoint causative mutations.

Main Results:

Successful induction of mutations leading to temperature-sensitive SARS-CoV-2.
Isolation and characterization of distinct TS viral clones.
Identification of specific mutations conferring the temperature-sensitive phenotype.

Conclusions:

The described protocol provides a reliable method for generating TS SARS-CoV-2 strains.
This methodology facilitates the study of viral genetics and the development of attenuated virus-based vaccines or therapeutics.