ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (12): 2457-2468.doi: 10.11843/j.issn.0366-6964.2016.12.016

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Development and Application of a GeXP-multiplex PCR Assay for Detection of Nine Duck Viruses

ZHANG Yan-fang, XIE Zhi-xun*, XIE Li-ji, DENG Xian-wen, XIE Zhi-qin, LUO Si-si, HUANG Li, HUANG Jiao-ling, ZENG Ting-ting, WANG Sheng   

  1. (Guangxi Key Laboratory of Veterinary Biotechnology, Guangxi Veterinary Research Institute, Nanning 530001, China)
  • Received:2016-06-27 Online:2016-12-23 Published:2016-12-23

Abstract:

This experiment was developed to simultaneously detect these nine viral pathogens that cause infections in ducks including avian influenza virus (AIV) subtypes H5, H7, and H9; duck hepatitis A virus (DHAV-A); duck Tembusu virus (DTMUV); duck enteritis virus (DEV); egg drop syndrome virus (EDSV); Newcastle disease virus (NDV); duck circovirus (DuCV); muscovy duck reovirus (MDRV); and muscovy duck parvovirus (MDPV). Twelve pairs of specific primers were designed according to the conserved sequences of the genes from each pathogen available in the GenBank database. Single, mixed pathogen cDNA/DNA templates, other common duck pathogens and duck organs nucleic acids were used to evaluate the specificity of the GeXP-multiplex assay. Serial dilution from 106 to 101 copies•μL-1 of in vitro transcript RNA of target genes and plasmids were used to test the sensitivity of GeXP multiplex PCR assay. Different amounts of the templates (103 and 107 copies•μL-1) were selected at random, mixed and tested in the GeXP multiplex PCR assay. The results were compared with those of the single template GeXP multiplex PCR assay. The GeXP assay was evaluated using 150 clinical specimens and compared with the single PCR. All positive specimens in the GeXP multiplex PCR and conventional PCR were identified via sequencing to verify the accuracy and reliability of the GeXP assay. These results showed that the corresponding specific fragments of genes were amplified by the single and multiplex GeXP PCR assay. Other pathogens did not result in amplification products. The detection limit of GeXP was 103 copies•μL-1 when all nine types of duck virus were present. The results of the interference assay showed that three specific amplification peaks can still be observed in the case of combination of three different concentration templates. The results of these experiments showed that mixed infections can be detected by GeXP multiplex PCR with minimal interference. Compared with the results of conventional PCR, the GeXP multiplex PCR method was more sensitive and accurate in the detection of 150 clinical samples. In conclusion, this GeXP-based multiplex PCR is a high-throughput, specific and sensitive test to detect nine duck viruses. This assay provides a new method in rapid molecular diagnosis for mix clinical duck virus samples.

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