畜牧兽医学报 ›› 2009, Vol. 40 ›› Issue (5): 706-711.doi:

• 预防兽医 • 上一篇    下一篇

口蹄疫病毒Asia1/JS/China/2005株基因组全长感染性克隆的构建

李平花1,白兴文1,卢曾军1,孙普1,郭建宏1,曹伟军2,刘湘涛1,殷宏1*,刘在新1*   

  1. 1中国农业科学院兰州兽医研究所,家畜疫病病原生物学国家重点实验室,农业部畜禽病毒学重点实验室,国家口蹄疫参考实验室,兰州 730046;2甘肃农业大学, 兰州 730070
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-05-25 发布日期:2009-05-25
  • 通讯作者: 刘在新;殷宏

Construction of an Infectious Full-length cDNA Clone of Foot-and-mouth Disease Virus Asia1/JS/China/2005 Strain

LI Ping-hua1, BAI Xing-wen1, LU Zeng-jun1, SUN Pu1, GUO Jian-hong1,
CAO Wei-jun2, LIU Xiang-tao1, YIN Hong1*, LIU Zai-xin1*
  

  1. 1. State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, National FootandMouth Disease Reference Laboratory, Lanzhou Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Lanzhou 730046, China;2. Gansu Agricultural University, Lanzhou 730070,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-05-25 Published:2009-05-25

摘要: 利用长距离RT-PCR技术扩增病毒基因组3′端覆盖口蹄疫病毒Asia1/JS/China/2005株近全长的3个片段(共约7.5 kb),并利用单一酶切位点将其分别克隆到pBluescriptSK+ 载体上。利用融合PCR扩增到基因组5′端含有15个C碱基的基因片段(约700 bp),并将其连接至pGEMT载体。最后将这4个片段的阳性克隆装配至剔除T7启动子的低拷贝载体pcDNA3.1/Zeo(+)中构建该病毒株的全长cDNA克隆。以构建的FMDV Asia1/JS/China/2005株全长cDNA为模板, 使用T7RNA 聚合酶在体外转录得到病毒RNA,通过脂质体将其导入BHK细胞获得拯救病毒。对收获的病毒分别用RT-PCR、间接免疫荧光、电子显微镜观察和乳鼠致病性分析结果证实,通过体外转录获得了具有感染性的口蹄疫病毒。该株感染性克隆的构建为深入研究口蹄疫病毒的致病机制及研制新型疫苗等奠定了基础。

Abstract: Three overlapping cDNA fragments covering the approximate FMDV full genome (7.5kb)of the 3′ end viral genome were amplified using long RTPCR and were cloned into pBluescriptSK+ vector with unique restriction sites, respectively. A fragment (about 0.7 kb ) including 15 C of the 5′ end viral genome was amplified by over-lap PCR and was cloned into pGEM-T vector. All positive clones were assembled into a low copy number vector pCDNA31/Zeo(+)which was removed T7 promoter in the vector sequence and constructed FMDV Asia1/JS/China/2005 full-length cDNA clone. RNA was synthesized in vitro using T7 polymerase, the infective virus was obtained by transfecting the RNA into BHK-21 cells. The rescued virus was identified by the RT-PCR, indirect immunofluorescence, electron microscope and sulk mice pathogenicity, the results showed infectious FMDV was rescued successfully. The full-length infectious cDNA clone will lays the basis for elucidating the mechanism of pathogenesis of FMDV and developing novel vaccines against FMD.