ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (10): 2079-2087.doi: 10.11843/j.issn.0366-6964.2019.10.014

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Establishment and Application of Strand Specific SYBR Green Real-time PCR for Detection of Bovine Viral Diarrhea Virus

LIU Cun1,2,4, DENG Yong3, LIANG Lin1,4, LI Jinxiang1,4, ZHANG Yanming2, CUI Shangjin1,4*   

  1. 1. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. College of Veterinary Medicine, Northwest A & F University, Yangling 712100, China;
    3. China Institute of Veterinary Drug Control, Beijing 100081, China;
    4. Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Technology of Beijing of Ministry of Agriculture, Beijing 100193, China
  • Received:2019-03-21 Online:2019-10-23 Published:2019-10-23

Abstract: To quantitatively detect the positive and negative strand RNAs of bovine viral diarrhea virus (BVDV) during intracellular replication, the specific reverse transcription primers with non-viral nucleotide sequences for distinguishing the positive and negative strand RNAs of BVDV from each other and primers for real-time PCR were designed using DNAStar and Primer express 3.0 software. Primer pairs composed of real-time PCR primers and non-viral nucleotide sequences were used for the establishment of strand specific reverse transcription real-time quantitative PCR (ssRT-qPCR). The sensitivity, reproducibility and specificity of the ssRT-qPCR were evaluated. The dynamic changes of the positive and negative strand RNAs of BVDV during intracellular replication were described by the established ssRT-qPCR. Results were as follows:The standard curve of ss(+)RT-qPCR and ss(-)RT-qPCR had good linear relationships in the range of 102-107 copies of template with the linear correlation coefficients up to 0.998 1 and 0.995 3, respectively. Sensitivity test showed that the lowest detection limit of ss(+)RT-qPCR was 10 copies of template, while that of ss(-)RT-qPCR was 100 copies of template. The ssRT-qPCR was reproducibility with less than 1% of the coefficient of valuation. There were no cross-reactions with bovine parainfluenza virus type 3, infectious bovine rhinotracheitis virus, and bovine respiratory syncytial virus. The dynamic changes of the positive and negative strand RNAs of BVDV during replication in MDBK cells infected with different multiplicity of infection were analyzed using ssRT-qPCR. The results showed that the positive and negative strand RNAs of BVDV increased firstly, then decreased, and then gradually increased in MDBK cells inoculated with BVDV at 10 and 0.1 MOI. Meanwhile, the dynamic change of positive and negative strand RNAs of BVDV was different in MDBK cells infected with BVDV at 1 MOI which the overall upward trend. The positive and negative strand RNAs of BVDV eventually reached a plateau in MDBK cells inoculated with BVDV at 10 and 1 MOI after 36 hours. However, the positive and negative strand RNAs of BVDV eventually reached a plateau in MDBK cells inoculated with BVDV at 0.1 MOI after 24 hours. The applicability of ssRT-qPCR was further validated by BVDV chain specificity test. ssRT-qPCR of BVDV was established in this study and the dynamic changes of positive and negative strand RNAs of BVDV during intracellular replication were described. This study provided a research tool for the researches of the antiviral mechanisms of host proteins and replication and regulation mechanisms of BVDV.

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