Identification of recombinant baculovirus and determination of virus titer with fluorescence quantitative PCR assay |
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Authors: | TONG Xia-sheng MENG Zhe-feng△ |
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Institution: | 1.Department of Pulmonology,The Third People’s Hospital of Wenling City,Zhejiang 317523,China;2.National Center for AIDS/STD Control and Prevention,Chinese Center for Disease Control and Prevention,Beijing 100002,China.E-mail:zfm863@yahoo.com.cn |
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Abstract: | AIM: To develop a real-time PCR assay based on TaqMan technology for the identification of recombinant baculovirus and determination of virus physical titers in Bac-to-Bac system.METHODS: The recombinant baculovirus containing human IL-18 gene was produced using Bac-to-Bac system.A 10-fold serially diluted primary viral stock was used for plaque assay and DNA extraction.Bacmid (baculovirus plasmid) was 10-fold serially diluted and served as standards.Real-time PCR amplification of the IL-18 gene was performed in triplicate for each diluted recombinant virus.At the same time,plaque assays were performed using overlay agarose method.RESULTS: The standard linear range (101 to 108 copies) for quantitation was achieved with the standard curve.We also find that the“vg/mL”titer value is generally about 10 times than“pfu/mL”titer of the same recombinant virus stock.CONCLUSION: A TaqMan real-time PCR method is established to identify the recombinant baculovirus and determine the“vg/mL”titer of virus.The method is rapid and quantitative over a wide range of virus titers. |
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Keywords: | Fluorescence quantitative PCR Identification of recombinant baculovirus Virus titer |
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