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Researchers recently announced the successful development of a Getah virus infectious clone based on the BJ-Swzp-2022 isolate. Getah virus (GETV) is a re-emerging mosquito-borne arbovirus. It infects a broad range of domestic and wild animals, including horses, pigs, cattle, and blue foxes. Interestingly, this specific strain was isolated from a contaminated batch of a Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) live vaccine. Consequently, the creation of a stable molecular platform is vital for ensuring vaccine purity and investigating viral pathogenesis.
To establish the reverse genetics system, the team first sequenced the complete genome of the BJ-Swzp-2022 isolate. Subsequently, they used this genetic blueprint to construct a full-length infectious cDNA clone. The researchers utilized T7 RNA polymerase to drive the transcription process. To rescue the infectious virus, they transfected BSR T7/5 cells, which specifically express T7 RNA polymerase. Significantly, this method allowed for the efficient production of the virus from the cloned DNA template. Moreover, initial tests confirmed that the rescued virus maintained biological characteristics very similar to those of the original parental virus.
The establishment of this platform provides a powerful tool for virologists. It allows for precise genetic manipulation of the GETV genome to identify specific virulence determinants. Furthermore, researchers can now use the Getah virus infectious clone to develop attenuated vaccine candidates. This is particularly important because current outbreaks in livestock cause substantial economic losses. In addition, studying the virus at a molecular level helps scientists understand how it might spill over into human populations. Finally, this reverse genetics approach facilitates the rapid testing of antiviral compounds in laboratory settings.
Getah virus is a mosquito-borne RNA virus belonging to the Alphavirus genus. It is known to cause fever, rash, and reproductive issues in livestock such as pigs and horses.
This strain was notably discovered as a contaminant in a veterinary live vaccine. This finding highlights the importance of rigorous screening and the need for molecular tools to study such isolates.
An infectious clone allows researchers to create the virus in a controlled environment from a DNA copy. This enables them to mutate specific genes and observe how those changes affect the virus's ability to replicate or cause disease.
Disclaimer: This content is for informational and educational purposes only. It does not constitute professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.
References
Kong D et al. Generation of an infectious cDNA clone of BJ-Swzp-2022, a Group III Isolate of Getah Virus. Virus Genes. 2026 Feb 07. doi: 10.1007/s11262-026-02219-w. PMID: 41653382.
Zhou X et al. Getah Virus (Alphavirus): An Emerging, Spreading Zoonotic Virus. Pathogens. 2022 Aug 20; 11(8): 945. doi: 10.3390/pathogens11080945.
Shi N et al. Highly Pathogenic Swine Getah Virus in Blue Foxes, Eastern China, 2017. Emerging Infectious Diseases. 2019; 25(6): 1252-1254. doi: 10.3201/eid2506.181694.
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