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Published on: November 1, 2011
Generation of rescued Japanese encephalitis virus genotype 1 from infectious full-size clone using reverse genetics
Sehyun Kim1, Min Sun Kim2, Aleksandra Nowakowska3
1Department of Bio-industrial Technologies, Konkuk University, Seoul, 05029, Republic of Korea.
Insights
Researchers created a stable Japanese encephalitis virus (JEV) clone using reverse genetics. This tool aids in studying JEV properties and developing new JEV vaccines.
Area of Science:
- Virology
- Molecular Biology
- Vaccinology
Background:
- Japanese encephalitis virus (JEV) causes significant child mortality and morbidity.
- Genotype 1 (GI) is the dominant JEV strain in South Korea, necessitating targeted research.
- Genetically stable full-length JEV complementary DNA (cDNA) clones are crucial for vaccine development and molecular studies.
Purpose of the Study:
- To construct a genetically stable, full-length infectious clone of the prevalent JEV genotype 1 (GI) strain.
- To establish a functional reverse genetics system for JEV research and vaccine development.
- To analyze the characteristics of the rescued JEV-GI virus *in vitro* and *in vivo*.
Main Methods:
- Synthesized cDNA from JEV-GI RNA.
- Generated a full-length JEV-GI cDNA clone (pTRE-JEVGI) using a reverse genetics system.
- Rescued the JEV-GI virus from the clone and performed *in vitro* and *in vivo* analyses.
Main Results:
- Successfully constructed a recombinant full-length JEV-GI clone, pTRE-JEVGI.
- Rescued JEV-GI virus exhibited characteristics similar to the wild-type strain.
- The reverse genetics system proved effective in generating infectious JEV clones.
Conclusions:
- The developed reverse genetics system enables the creation of infectious JEV clones for studying viral properties and immunogenicity.
- This system can facilitate the development of novel Japanese encephalitis vaccines.
- The system may serve as a vector for heterologous gene expression in JEV research.
Abstract:
Japanese encephalitis virus (JEV) is a pathogen responsible for high mortality and morbidity rates among children with encephalitis. Since JEV genotype 1 (GI) is the most prevalent strain in South Korea these days, corresponding research and vaccine development is urgently required. Molecular genetic studies on JEV vaccines can be boosted by obtaining genetically stable full-length infectious JEV complementary DNA (cDNA) clones. Furthermore, the significance of the reverse genetics system in facilitating molecular biological analyses of JEV properties has been demonstrated. This study constructed a recombinant JEV-GI strain using a reverse genetics system based on a Korean wild-type GI isolate (K05GS). RNA extracted from JEV-GI was used to synthesize cDNA, a recombinant full-length JEV clone, pTRE-JEVGI, was generated from the DNA fragment, and the virus was rescued. We performed in vitro and in vivo experiments to analyze the rescued JEV-GI virus. The rescued JEV-GI exhibited similar characteristics to wild-type JEV. These results suggest that our reverse genetics system can generate full-length infectious clones that can be used to analyze molecular biological factors that influence viral properties and immunogenicity. Additionally, it may be useful as a heterologous gene expression vector and help develop new strains for JEV vaccines.
