title: Recombinant porcine reproductive and respiratory syndrome virus expressing luciferase genes provide a new indication of viral propagation in both permissive and target cells.
abstract: Porcine reproductive and respiratory syndrome virus (PRRSV) has a condensed single-stranded positive-sense RNA genome that contains several overlapping regions. The transcription regulatory sequence (TRS) is the important cis-acting element participating in PRRSV discontinuous transcription process. Based on reverse genetic system of type 2 highly pathogenic PRRSV cell-passage attenuated strain pHuN4-F112, firefly luciferase or Renilla luciferase genes were inserted between ORF1b and ORF2. An extra TRS6 was embedded behind the foreign luciferase genes. pA-Fluc and pA-Rluc were constructed and successfully rescued in MARC-145 cells. The phenotypical characteristics of the progeny virus were indistinguishable from those of vHuN4-F112 and were genetically stable for at least 25 cell passages. Mutant virus-infected cells were lysed at different time points to assess luciferase activities and measure foreign gene expression levels. The results showed identical variations in the luciferase activities of the recombinants in MARC-145 cells, indicating that they were suitable for monitoring viral propagation in PRRSV-permissive cell cultures. They were also used to infect pulmonary alveolar macrophages, which yielded similar variations in luciferase activities. Therefore, vA-Fluc and vA-Rluc present powerful new tools to monitor PRRSV propagation in both passaged and target cells.
authors.affiliation: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Gao
authors.affiliation: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China.
authors.forename: Zehui
authors.initials: Z
authors.lastname: Qu
authors.affiliation: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China.
authors.forename: Liwei
authors.initials: L
authors.lastname: Li
authors.affiliation: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China.
authors.forename: Lingxue
authors.initials: L
authors.lastname: Yu
authors.affiliation: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China.
authors.forename: Yifeng
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China.
authors.forename: Yanjun
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China.
authors.forename: Shen
authors.initials: S
authors.lastname: Yang
authors.affiliation: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Zheng
authors.affiliation: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China.
authors.forename: Qinfeng
authors.initials: Q
authors.lastname: Huang
authors.affiliation: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China.
authors.forename: Wu
authors.initials: W
authors.lastname: Tong
authors.affiliation: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China. Electronic address: gztong@shvri.ac.cn.
authors.forename: Guangzhi
authors.initials: G
authors.lastname: Tong
mesh_terms: D000818:Animals; D002460:Cell Line; D015967:Gene Expression Regulation, Viral; D008156:Luciferases / Q000235:genetics / Q000378:metabolism*; D016676:Macrophages, Alveolar / Q000821:virology; D019318:Porcine Reproductive and Respiratory Syndrome / Q000821:virology*; D019316:Porcine respiratory and reproductive syndrome virus; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism*; D013552:Swine; D014779:Virus Replication / Q000502:physiology*
chemical_list: D011994:Recombinant Proteins; D008156:Luciferases
keywords: Firefly luciferase; Relative activity; Renilla luciferase; Viral propagation