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Development of a reverse genetics system for West Nile virus (Kunjin type)
Zhen Wu1,2,3,4, Tao Hu1,2,3, Zhou Zhou1,2,3
1Institute of Veterinary Medicine and Immunology, Sichuan Agricultural University, Chengdu, Sichuan, China.
Frontiers in Veterinary Science
|September 10, 2025
Summary
Researchers developed new reverse genetics tools for Kunjin virus (KUNV), a West Nile virus (WNV) strain. These systems enable better study of KUNV's lifecycle, aiding antiviral drug and vaccine development.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Kunjin virus (KUNV), an attenuated West Nile virus (WNV) strain, shares transmission routes and hosts with WNV.
- Reverse genetics is crucial for understanding flavivirus molecular mechanisms.
- Developing robust KUNV reverse genetics systems is essential for research and therapeutic development.
Purpose of the Study:
- To engineer and validate KUNV reporter replicons and pseudovirus systems.
- To generate a stable KUNV reporter virus for further studies.
- To establish versatile molecular tools for KUNV research.
Main Methods:
- Engineered cytomegalovirus (CMV) promoter-driven KUNV replicons with Nanoluc, oxGFP, and mCherry reporter genes.
- Established an in vitro KUNV pseudovirus packaging system using helper plasmids (full-length C-prM/E and truncated C18-prM/E).
- Generated a stable KUNV reporter virus by inserting the NanoLuc gene into an infectious KUNV clone.
Main Results:
- KUNV replicons showed successful translation and replication in mammalian and avian cell lines.
- Both helper plasmids efficiently packaged replicon RNA into pseudoviruses, with C18-prM/E demonstrating superior efficiency.
- The generated KUNV reporter virus remained genetically stable over five serial passages.
Conclusions:
- Developed robust in vitro reverse genetics systems for KUNV.
- These systems are valuable for investigating KUNV lifecycle, screening antiviral drugs, and developing vaccines.
- The engineered tools provide essential molecular resources for flavivirus research.
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