ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (8): 1635-1644.doi: doi: 10.11843/j.issn.0366-6964.2016.08.014

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The Viral Gene Expression Profiles and Pathogenic Phases of the Disease Caused by Very Virulent MDV Strain GX0101

MA Sheng-ming 1,2,TENG Man 2,YU Zu-hua 1,DANG Lu 2,LI Hui-zhen 3,DING Ke 1,DENG Rui-guang 2,LUO Jun 1,2*   

  1. (1.Key Laboratory of Animal Disease and Public Safety,College of Animal Science and Technology,
    Henan University of Science and Technology,Luoyang 471003,China;2.Key Laboratory of Animal
    Immunology of the Ministry of Agriculture,Henan Provincial Key Laboratory of Animal Immunology,
    Henan Academy of Agricultural Sciences,Zhengzhou 450002,China;3.College of Animal Science
    and Veterinary Medicine,Henan Agricultural University,Zhengzhou 450002,China)
  • Received:2016-03-21 Online:2016-08-23 Published:2016-08-23

Abstract:

The present work was performed to study the infection phases of Marek’s disease (MD),namely ‘Cornell Model’,caused by the very virulent (vv) Marek’s disease virus (MDV) strain GX0101.For the first step,one-day-old specific pathogen free (SPF) chickens were challenged by GX0101 to establish the animal model of MD.Then,the kinetic transrption levels of 10 representative MDV protein-coding genes at different days post-infection (dpi) were determined by real-time quantitative PCR (RT-qPCR).The results showed that the onset of clinical symptoms and autopsy lesions of GX0101-infected birds was consistent with the typical MD cases.Some of the MDV protein-coding genes,including the structural protein-coding genes of gB,gE and UL6,the nonstructural protein-coding genes of UL42 and UL52,the immediate early infected cell protein 4 gene (ICP4),the horizontal transmission associated gene of UL13 and the 38 kD phosphorylated protein gene (pp38),demonstrated a similar transcription pattern,which increased to a first peak at 7 dpi,fell to a bottom level at 10 dpi,increased again at 14 dpi and reached to a second peak at 21 dpi,and then gradually declined to low levels from 30 to 60 dpi.However,both of the unique MDV oncogene meq and virulence related gene RLORF6 represented a persistent increasing transcription trend from 7 dpi,and then kept at a higher transcription level from 14 to 60 dpi.Our previous and present data indicates that the ‘Cornell Model’ of MD caused by GX0101 are as blow:the early cytolytic phase occurs at 1-7 dpi,the latent phase establishes at about 10 dpi and the late cytolytic and immunosuppressive phase appears at 14-21 dpi,while the T cell transformation and lymphomagenesis possibly starts at about 14 dpi.

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