利用反向遗传学技术拯救重组H1N1 pdm09亚型流感病毒
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1.南京医科大学病原生物学系;2.中科南京生命健康高等研究院;3.南京医科大学

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江苏省“双创人才”项目


Rescue of recombinant H1N1 pdm09 influenza virus by reverse genetics
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1.Department of Pathogen Biology, Nanjing Medical University;2.Nanjing Advanced Academy of Life and Health

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    摘要:

    目的:利用反向遗传学技术拯救重组H1N1 pdm09病毒。方法:RT-PCR技术扩增A/Puerto Rico/8/1934(简称PR8)病毒基因片段,全基因合成A/Wisconsin/588/2019(H1N1)的HA和NA片段,分别克隆至pHW2000双向表达载体上。将PR8病毒6个内部基因重组质粒与A/Wisconsin/588/2019的HA和NA重组质粒共转染293T细胞,拯救重组病毒。对重组病毒进行RT-PCR鉴定,血凝效价测定,生长曲线绘制以及对小鼠致病性评价。结果:成功拯救出重组A/Wisconsin/588/2019病毒,测序鉴定其HA和NA序列与预期一致,重组病毒在MDCK细胞上的病毒滴度为105.38TCID50/mL,在9~10日龄鸡胚上扩增的血凝效价达29,对小鼠的半数致死剂量为LD50=10-1.38/50μL。结论:成功拯救一株重组H1N1 pdm09病毒。为反向遗传学技术快速拯救流感病毒提供新思路。

    Abstract:

    Objective: In this study, we used reverse genetics method to rescue a recombinant H1N1 pdm09 viruses. Methods: The six internal gene segments of A/Puerto Rico/8/1934 (PR8) virus were amplified by RT-PCR, HA and NA of A/Wisconsin/588/2019 (H1N1) were synthesized. The above eight gene segments were cloned into pHW2000 bidirectional expression vector, respectively. The plasmids were co-transfected into 293T cells to rescue the recombinant virus. The recombinant virus was identified by RT-PCR and hemagglutination test. The viral growth curve in MDCK cells was drawn. The viral pathogenicity was evaluated in mice. Results: The recombinant A/Wisconsin/588/2019 virus was rescued. The viral titers of the recombinant virus on MDCK cells were 105.38TCID50/mL. The hemagglutination titers reached 29 on eggs. The median lethal dose to mice was LD50=10-1.38/50μL. Conclusion: A recombinant H1N1 pdm09 virus was successfully rescued. This study provides a new idea for the rapid rescue of influenza viruses by reverse genetics method.

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  • 收稿日期:2024-08-20
  • 最后修改日期:2024-11-04
  • 录用日期:2025-02-17
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