Acta Veterinaria et Zootechnica Sinica ›› 2023, Vol. 54 ›› Issue (2): 847-854.doi: 10.11843/j.issn.0366-6964.2023.02.040

• RESEARCH NOTES • Previous Articles    

Establishment of TaqMan Detection Method of Porcine Epidemic Diarrhea Virus and Analysis of Genetic Variation based on S Gene

ZHAI Gang1,2, GU Wenyuan3, LIU Tao4, LIU Ying1, ZHANG Shuai1, FAN Jinghui1,2*, ZUO Yuzhu1,2*   

  1. 1. College of Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China;
    2. Hebei Veterinary Biotechnology Innovation Center, Hebei Agricultural University, Baoding 071001, China;
    3. Hebei Center for Animal Disease Prevention and Control, Shijiazhuang 050000, China;
    4. Ringpu (Baoding) Biological Pharmaceutical Co., Ltd., Baoding 071001, China
  • Received:2022-05-05 Online:2023-02-23 Published:2023-02-21

Abstract: The present study established a universal TaqMan qPCR detection method that can quickly, efficiently and sensitively detect porcine epidemic diarrhea virus (PEDV), and further understand the genetic variation of PEDV in Hebei Province. Here we designed specific primers and probes with reference to the conservative region of M gene of the PEDV variant AJ1102, and optimized the primer concentration, annealing temperature and other conditions, a qPCR method for screening PEDV in pig farms was established, and the S gene of the positive samples was amplified and sequenced for genetic evolution analysis. The results showed that the specificity of this method was strong, and there was no cross reaction with common pig diseases such as porcine circovirus type 2 (PCV2), porcine circovirus type 3 (PCV3) and transmissible gastroenteritis virus (TGEV); The minimum detection limit of the established detection method for pMD19T-PEDV standard is 1.09×101 copy·μL-1. It is about 100 times more sensitive than ordinary PCR and has high sensitivity; The coefficient of variation within and between groups was less than 1%, with good repeatability. The nine sequences successfully cloned based on the whole S gene were distributed in two subgroups of GⅡ, and the nucleotide homology of the nine cloned sequences were 96.6%-99.1%; The homology of amino acids were 94.6%-98.7%. The results showed that the epidemic strains of PEDV obtained in this study were closely related to the domestic strains isolated in recent years, but far related to the vaccine strains currently used in China and the European strains, which indicated that the current epidemic strains of PEDV in some areas of Hebei Province were more complex and had a trend of variation, suggesting the necessity of continuous detection of the variation dynamics of the epidemic strains of PEDV. This study not only provides technical support for the clinical diagnosis of PEDV, but also provides a reference for further understanding the genetic evolution of PEDV.

Key words: porcine epidemic diarrhea virus, qPCR, S gene, genetic variation analysis

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