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Rapid Recovery of Classical Swine Fever Virus Directly from Cloned cDNA

文献类型： 外文期刊

作者： Huang Jun-hua 1 ; Li Yong-feng 1 ; He Fan 1 ; Li Dan 1 ; Sun Yuan 1 ; Han Wen 1 ; Qiu Hua-ji 1 ;

作者机构： 1.Chinese Acad Agr Sci, Harbin Vet Res Inst, State Key Lab Vet Biotechnol, Div Swine Infect Dis, Harbin 150001, Peoples R China

关键词： classical swine fever virus;reverse genetics;T7 RNA polymerase;stable cell line

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2013 年 12 卷 5 期

页码：

收录情况： SCI

摘要： The reverse genetics for classical swine fever virus (CSFV) is currently based on the transfection of in vitro transcribed RNA from a viral genomic cDNA clone, which is inefficient and time-consuming. This study was aimed to develop an improved method for rapid recovery of CSFV directly from cloned cDNA. Full-length genomic cDNA from the CSFV Shimen strain, which was flanked by a T7 promoter, the hepatitis delta virus ribozyme and T7 terminator sequences, was cloned into the low-copy vector pOK12, producing pOKShimen-RzT Phi. Direct transfection of pOKShimen-RzT Phi into PK/T7 cells, a PK-15-derived cell line stably expressing bacteriophage T7 RNA polymerase, allowed CSFV to be rescued rapidly and efficiently, i.e., at least 12 h faster and 31.6-fold greater viral titer when compared with the in vitro transcription-based rescue system. Furthermore, the progeny virus rescued from PK/T7 cells was indistinguishable, both in vitro and in vivo, from its parent virus and the virus rescued from classical reverse genetics. The reverse genetics based on intracellular transcription is efficient, convenient and cost-effective. The PK/T7 cell line can be used to rescue CSFV directly from cloned cDNA and it can also be used as an intracellular transcription and expression system for studying the structure and function of viral genes.

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