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Recovery of viable porcine reproductive and respiratory syndrome virus from an infectious clone containing a partial deletion within the Nsp2-encoding region

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Abstract

Non-structural protein 2 (Nsp2) of porcine reproductive and respiratory syndrome virus (PRRSV) is the most variable region and postulated to play an important role in cell and tissue tropism of PRRSV. To investigate the role of Nsp2 in the viability and growth of PRRSV in cells in vitro, two cDNA clones were constructed containing a deletion of 63 consecutive nucleotides (pWSK-DCBAd63) or 117 nucleotides (pWSK-DCBAd117) within the Nsp2-encoding region of PRRSV (BJ-4). The clone pWSK-DCBAd63 was infectious and produced viable recombinant virus, whereas clone pWSK-DCBAd117 could not be rescued. The rescued virus was able to induce CPE typical of PRRSV on MARC-145 cells and was stably propagated during sequential in vitro cell passages, like the virus recovered from the full-length cDNA clone of PRRSV BJ-4. In comparison to the parental virus (BJ-4) and the virus recovered from the full-length cDNA clone of the BJ-4 strain, the rescued virus from pWSK-DCBAd63 exhibited enhanced growth kinetics, reaching the peak progeny virus titer by 48 h postinfection. These observations suggest that the Nsp2-encoding region is necessary for productive virus infection, and partial deletion does not influence the viability and propagation of PRRSV in cell culture, which may provide a way to insert a foreign gene into the viral genome as a marker for differentiation.

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Acknowledgments

This study was supported by a National Key Basic Research Plan Grant (#2005CB523204), National 863 Program (Grant No.2006AA10A204) and National Key Technology R&D Program of China (Grant No. 2006BAD06A03) from Chinese Ministry of Science and Technology.

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Authors and Affiliations

  1. Key Laboratory of Preventive Veterinary Medicine of Ministry of Agriculture, College of Veterinary Medicine and State Key Laboratory of Agrobiotechnolgy, China Agricultural University, 10094, Bei**g, People’s Republic of China

    Z. G. Ran, X. Y. Chen, X. Guo, X. N. Ge & H. C. Yang

  2. Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, IA, Ames, 50011-1250, USA

    K. J. Yoon

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  1. Z. G. Ran
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  2. X. Y. Chen
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  4. X. N. Ge
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  6. H. C. Yang
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Correspondence to K. J. Yoon or H. C. Yang.

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Hanchun Yang and Kyoung-** Yoon are equal contribution corresponding authors.

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Ran, Z.G., Chen, X.Y., Guo, X. et al. Recovery of viable porcine reproductive and respiratory syndrome virus from an infectious clone containing a partial deletion within the Nsp2-encoding region. Arch Virol 153, 899–907 (2008). https://doi.org/10.1007/s00705-008-0064-3

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  • DOI: https://doi.org/10.1007/s00705-008-0064-3

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