Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (2): 404-408.doi: 10.11843/j.issn.0366-6964.2020.02.023

• RESEARCH NOTES • Previous Articles    

Establishment and Application of a SYBR Green Ⅰ Real-time PCR Technique for the Detection of Porcine Astrovirus 4

CHEN Shaojie1, LIU Lihui2, WU Zhiyong3, XIAO Na2, YUAN Guangfu1, WANG Jing1, XING Yaru1, LIU Ruyue1, FAN Jinghui1*, ZUO Yuzhu1*   

  1. 1. College of Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China;
    2. Dingzhou Bureau of Agricultural and Rural Affairs, Dingzhou 073000, China;
    3. Handan Animal Husbandry Technology Promotion Station, Handan 056000, China
  • Received:2019-09-19 Online:2020-02-23 Published:2020-02-22

Abstract: In order to establish a SYBR Green Ⅰ fluorescence quantitative RT-PCR method for the rapid detection of Porcine astrovirus 4 (PAstV4), a pair of specific primer was designed based on the conservative ORF1a gene. The amplified fragment was cloned into pMD19-T vector. The acquared recombinant plasmid, as a standard, was detected by SYBR Green Ⅰ fluorescence quantitative RT-PCR assay. And the sensitivity, specificity and repeatability were verified. The results showed that the minimum detectable amount of the method was 50.3 copies·μL-1, which was 100 times more sensitive than the traditional PCR, and there was no cross reaction with CSFV, PRRSV, PRV, PEDV and PDCoV. The established standard curve showed a good linear relationship with R2=1.00. The established method was used to detect 43 clinical samples collected from 2018 to 2019, with a positive rate of 18.6%. These results indicated that a convenient, specific and sensitive qPCR assay was successfully established for the detection of PAstV4.

Key words: Porcine astrovirus, RT-PCR, SYBR Green Ⅰ

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