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. 2013 May 8;12(5):877–883. doi: 10.1016/S2095-3119(13)60258-0

Rapid Recovery of Classical Swine Fever Virus Directly from Cloned cDNA

Jun-hua HUANG 1, Yong-feng LI 1, Fan HE 1, Dan LI 1, Yuan SUN 1, Wen HAN 1, Hua-ji QIU 1,*
PMCID: PMC7129766  PMID: 32288949

Abstract

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-RzTΦ. Direct transfection of pOKShimen-RzTΦ 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.

Key words: classical swine fever virus, reverse genetics, T7 RNA polymerase, stable cell line

Contributor Information

Jun-hua HUANG, Email: jhhuang@ymail.com.

Hua-ji QIU, Email: huajiqiu@hvri.ac.cn.

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