Abstract
Mononegaviruses are promising tools as oncolytic and transgene vectors for gene therapy and regenerative medicine. However, when mononegaviruses are used for therapeutic applications, the viral activity must be strictly controlled due to concerns about toxicity and severe side effects. With this technology, mononegavirus vectors can be grown where they are intended and can be easily removed when they are no longer needed. In particular, a photoswitch protein called Magnet (consisting of two magnet domains) is incorporated into the hinge region between the connector and methyltransferase domains of the mononegavirus polymerase protein (L protein) to disrupt the L protein functions. Blue light (470 ± 20 nm) irradiation causes the dimerization of the two magnet domains, and the L protein is restored to activity, allowing viral gene expression and virus replication. Since the magnet domains’ dimerization is reversible, viral gene expression and replication cease when blue light irradiation is stopped.
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Acknowledgments
The reverse genetics system for the RABV HEP-Flury strain was provided by Drs. Mutsuyo Takayama-Ito and Masayuki Saijo (Department of Virology 1, National Institute of Infectious Diseases). BHK/T7 cells and Vero/hSLAM cells were provided by Drs. Naoto Ito (Gifu University) and Yusuke Yanagi (Kyushu University), respectively. This study was supported by grants from JSPS under grant number 19K07768 to M. Tahara, 22K08616 to TO, and 21H02744 to M. Takeda, grants from the Naito Foundation and Research Foundation for Opto-Science and Technology to M. Takeda, and grant from the Japan Agency for Medical Research and Development (AMED) under grant number 23wm0325063 to M. Takeda.
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Tahara, M., Okura, T., Sato, M., Takeda, M. (2024). Optical Control of Mononegavirus Gene Expression and Replication. In: Ma, D.Z., Pfaller, C.K. (eds) Measles and Related Morbilliviruses. Methods in Molecular Biology, vol 2808. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3870-5_4
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