4.6 Article

Dual Promoters Improve the Rescue of Recombinant Measles Virus in Human Cells

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VIRUSES-BASEL
卷 13, 期 9, 页码 -

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MDPI
DOI: 10.3390/v13091723

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measles virus; reverse genetics; negative-strand RNA virus; recombinant virus; multivalent vaccines; oncolytic vectors; mononegavirales

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  1. Leipzig University for Open Access Publishing

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Reverse genetics is a powerful tool for analyzing viral genes, developing vaccines, and gene delivery vectors. A new reverse genetics platform has been established to increase the recovery efficiency of measles virus in human cells.
Reverse genetics is a technology that allows the production of a virus from its complementary DNA (cDNA). It is a powerful tool for analyzing viral genes, the development of novel vaccines, and gene delivery vectors. The standard reverse genetics protocols are laborious, time-consuming, and inefficient for negative-strand RNA viruses. A new reverse genetics platform was established, which increases the recovery efficiency of the measles virus (MV) in human 293-3-46 cells. The novel features compared with the standard system involving 293-3-46 cells comprise (a) dual promoters containing the RNA polymerase II promoter (CMV) and the bacteriophage T7 promoter placed in uni-direction on the same plasmid to enhance RNA transcription; (b) three G nucleotides added just after the T7 promoter to increase the T7 RNA polymerase activity; and (c) two ribozymes, the hairpin hammerhead ribozyme (HHRz), and the hepatitis delta virus ribozyme (HDVrz), were used to cleavage the exact termini of the antigenome RNA. Full-length antigenome cDNA of MV of the wild type IC323 strain or the vaccine AIK-C strain was inserted into the plasmid backbone. Both virus strains were easily rescued from their respective cloned cDNA. The rescue efficiency increased up to 80% compared with the use of the standard T7 rescue system. We assume that this system might be helpful in the rescue of other human mononegavirales.

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