A TB40/E-derived human cytomegalovirus genome with an intact US-gene region and a self-excisable BAC cassette for immunological research
| Autor: | Kerstin Laib Sampaio, Anja Weyell, Narmadha Subramanian, Zeguang Wu, Christian Sinzger |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | BioTechniques, Vol 63, Iss 5, Pp 205-214 (2017) |
| Druh dokumentu: | article |
| ISSN: | 00011460 1940-9818 0736-6205 |
| DOI: | 10.2144/000114606 |
| Popis: | For immunological research on the human cytomegalovirus (HCMV), a virus that combines the broad cell tropism of clinical isolates, efficient replication in cell culture, the complete set of MHC-I modulator genes, and suitability for genetic engineering is desired. Here, we aimed to generate a genetically complete derivative of HCMV strain TB40/E as a bacterial artificial chromosome (BAC) with a self-excisable BAC cassette. The BAC cassette was inserted into the US2–US6 gene region (yielding TB40-BACKL7), relocated into the UL73/UL74 region with modifications that favor excision of the BAC cassette during replication in fibroblasts, and finally the US2–US6 region was restored, resulting in BAC clone TB40-BACKL7-SE When this BAC clone was transfected into fibroblasts at efficiencies >0.1%, replicating virus that had lost the BAC cassette appeared within 2 weeks after transfection, grew to high titers, and displayed the broad tropism of the parental virus. The degree of MHC-I down-regulation by this virus was consistent with functional restoration of US2–US6. To enable detection of infected cells by flow cytometry, an enhanced green fluorescent protein (EGFP)-expression cassette was inserted downstream of US34A, yielding the fluorescent virus RV-TB40-BACKL7-SE-EGFP. |
| Databáze: | Directory of Open Access Journals |
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