ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (6): 1198-1208.doi: 10.11843/j.issn.0366-6964.2016.06.015

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Simultaneous Detecting Six Immunosuppressive Chicken Viruses by a GeXP Analyser-based Multiplex PCR Assay

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

  1. (Guangxi Key Laboratory of Animal Vaccines and Diagnostics,Guangxi Veterinary Research Institute,Nanning 530001,China)
  • Received:2015-09-29 Online:2016-06-23 Published:2016-06-23

Abstract:

The objective of this research was to develop a novel,high-throughput Genome Lab Gene Expression Profiler Analyser-based multiplex PCR method (GeXP-multiplex PCR) for simultaneous detection of 6 immunosuppressive chicken viruses.Using chimeric primers,6 immunosuppressive chicken viruses,including Marek’s disease virus (MDV),three subgroups of avian leucosis virus (ALV-A/B/J),reticuloendotheliosis virus (REV),infectious bursal disease virus (IBDV),chicken infectious anaemia virus (CIAV) and avian reovirus (ARV) were amplified and identified by their respective amplicon sizes.The concentration of the chimeric primers,Mg 2+ and Taq,and annealing temperature,and time were optimised according to the amplification efficiency of the GeXP-multiplex PCR assay.The assay specificity for each immunosuppressive viral target was individually and simultaneously tested with a mixture of 8 sets of chimeric primers in a multiplex PCR assay.Plasmid DNA and transcribed ssRNA were diluted to a final concentration ranging from 105 copies•20 μL-1 to 1 copy•20 μL-1 and then subjected to the GeXP-multiplex PCR assay with 8 sets of chimeric primers,both individually and in pre-mixed solutions.A total of 300 clinic specimens of disease chicken were detected by using GeXP-multiplex PCR.The results were confirmed using independent real-time PCR and sequencing to determine true positives.The specificity and sensitivity of the optimised GeXP-multiplex PCR assay were evaluated,and the data demonstrated that this technique could selectively amplify these 6 viruses at a sensitivity of 100 copies•20 μL-1 when all 6 viruses were present.Of the 300 examined clinical specimens,190 were positive for immunosuppressive viruses according to the GeXP-multiplex PCR assay.The GeXP-multiplex PCR assay is a high-throughput,sensitive and specific method for the detection of 6 immunosuppressive viruses that can be used for differential diagnosis and molecular epidemiologic surveys.

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