畜牧兽医学报 ›› 2015, Vol. 46 ›› Issue (5): 792-799.doi: 10.11843/j.issn.0366-6964.2015.05.015

• 预防兽医 • 上一篇    下一篇

细胞适应性猪流行性腹泻病毒部分基因序列分析及其致病力研究

冯晓声,刘琪,王悦芸,周如月,安欣宇,王贵平,贾爱卿*   

  1. (广东海大畜牧兽医研究院,广州 511400)
  • 收稿日期:2014-08-25 出版日期:2015-05-23 发布日期:2015-05-19
  • 通讯作者: 贾爱卿,高级兽医师,E-mail:jiaaq@haid.com.cn
  • 作者简介:冯晓声(1982-),男,内蒙古人,助理研究员,主要从事预防兽医学工作,E-mail:fengxsh@haid.com.cn
  • 基金资助:

    广州市南沙区技术开发项目(2014KF01);广州市产学研协同创新重大专项(156100070)

Mutations in Partial Genes of Porcine Epidemic Diarrhea Virus Associated with Growth Adaptation in vitro and Attenuation of Virulence in vivo

FENG Xiao-sheng,LIU Qi,WANG Yue-yun,ZHOU Ru-yue,AN Xin-yu,WANG Gui-ping,JIA Ai-qing*   

  1. (Guangdong Haid Institute of Animal Husbandry & Veterinary,Guangzhou 511400,China)
  • Received:2014-08-25 Online:2015-05-23 Published:2015-05-19

摘要:

对已经适应Vero细胞生长的猪流行性腹泻病毒CHYJ130330亲本代、第38代、第60代、第80代和第100代病毒的SMN基因分别进行测序及序列比对分析,结果显示MN基因具有高度的保守性,多次传代后未发生氨基酸的改变;S基因在第38代时未发生任何突变,第100代时发生了17个核苷酸的点突变,导致15个氨基酸发生改变。动物试验显示,第60代病毒仍能引起仔猪呕吐、腹泻等症状,而第100代的病毒毒力已经减弱。S基因的突变是否与病毒的毒力减弱有关还需进一步试验验证。

关键词: 猪流行性腹泻病毒, 突变, S基因, 毒力减弱

Abstract:

In this study,we further maintained the porcine epidemic diarrhea virus CHYJ130330 in Vero cells up to the 100th passage and analyzed changes in the spike(S),membrane(M),and nucleocapsid(N) gene sequences and pathogenicity of the virus at the 38th,60th,80th,and 100th passage levels.Sequence analyses revealed a strong selection for the S gene of CHYJ130330 in Vero cells,and all mutations occurring at the 60th,80th,and 100th-passage virus.In contrast,the viral M and N genes showed a strong conservation during the serial passage.Pigs that experimentally infected with the 60th and 80th-passage virus,but not the 100th-passaged virus,exhibited vomiting and diarrhea,indicating an attenuation of the CHYJ130330 at the 100th passage.Further studies will be required to define whether the mutations in the S gene of CHYJ130330 that had been selected and accumulated during the serial passages are indeed the causalities of the growth adaptation in vitro and the attenuation of virulence in vivo.

Key words: porcine epidemic diarrhea virus, mutation, spike gene, virus attenuation

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