Abstract
Infectious bursal disease virus (IBDV) causes immunosuppression in chickens. We investigated the molecular changes in chicken embryo fibroblasts (CEF) adapted IBDV by genomic sequencing. IBDV were serially passaged in CEF and chickens were infected with the IBDV obtained after different numbers of passages in CEF. Chicken infections showed that 16th, 20th, and 21st passage viruses were pathogenic, while 26th and 36th passage viruses were non-pathogenic. Sequencing demonstrated that the initial changes during the serial passage comprised of a single-nucleotide deletion in the 3′ non-coding region of segment B of the virus after 19th passage, followed by changes in the VP1 gene after the 20th passage of the virus and changes in VP2, VP5 after the 21st passage of the virus. These data suggested that the attenuation of very virulent IBDV was due to multigenic mutations and there are in vitro and in vivo competitive replications in IBDV quasispecies.
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Acknowledgments
This work was supported by National Key Basic Research Program of China (Grant 2005CB523203), National Key Technology Research and Development Program of China (Grant 2006BAD06A04), National Natural Science Foundation of China (Grant No. 30625030, 30870117), and State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The first Affiliated Hospital of Medical College, Zhejiang University (Grant No. 2008A03). We thank Prof. Jimmy Kwang for critical revision from Temasek Life Sciences Laboratory, The National University of Singapore.
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Shi, L., Li, H., Ma, G. et al. Competitive replication of different genotypes of infectious bursal disease virus on chicken embryo fibroblasts. Virus Genes 39, 46–52 (2009). https://doi.org/10.1007/s11262-008-0313-2
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DOI: https://doi.org/10.1007/s11262-008-0313-2