期刊
JOURNAL OF VIROLOGICAL METHODS
卷 156, 期 1-2, 页码 37-43出版社
ELSEVIER
DOI: 10.1016/j.jviromet.2008.10.026
关键词
Recombinant MVA; Host-range selection; Marker gene swapping; K1Lgfp; Fluorescent proteins
资金
- Associazione Italiana Ricerca Sul Cancro
- Consiglio Nazionale delle Ricerche
- Ministero della UniversitA e Ricerca scientifica
- Istituto Superiore di SanitA
Modified Vaccinia Virus Ankara (MVA) is employed widely as an experimental and human vaccine vector for its lack of replication in mammalian cells and high expression of heterologous genes. Recombinant MVA technology can be improved greatly by combining transient host-range selection (based on the restoration in MVA of the deleted vaccinia gene K1L) with the differential expression of fluorescent proteins. Recombinant virus results from swapping a red protein gene (in the acceptor virus) with a cassette of the transfer plasmid comprising the transgene and the green marker K1Lgfp (a chimeric gene comprising K1L and EGFP). Recombinant selection is performed in the selective host RK13. Finally, in the non-selective host BHK-21, a single crossover between identical flanking regions excises the marker gene. The three types of viruses involved (red parental, green intermediate and colourless final recombinant) are visualized differentially by fluorescence microscopy or fluoro-imaging of terminal dilution microcultures, leading to a straightforward and efficient purification protocol. This method (Red-to-Green gene swapping) reduces greatly the time needed to obtain marker-free recombinant MVA and increases the reliability of the construction process. (c) 2008 Elsevier B.V. All rights reserved.
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