Abstract
An Iranian field strain of chicken anemia virus (CAV), designated IR CAV, was isolated in the Marek’s disease virus-transformed lymphoblastoid cell line MDCC-MSB1 (MSB1) culture for the first time. The full-length CAV DNA of this strain was cloned in the bacterial plasmid pTZ57R/T to create the molecular clone pTZ-CAV. The nucleotide and deduced amino acid sequences of viral proteins of IR CAV were compared with those of representative CAV sequences including reference and commercial vaccine strains. IR CAV was not related to vaccine strains and also found to have glutamine at positions 139 and 144 confirming previous studies in which such mutations were associated with a slow rate of virus spread in cell culture. pTZ-CAV was digested with PstI to release IR CAV DNA and then transfected into MSB1 cell by electroporation. The transfected cells showed cytopathic effect similar to virion-initiated infection. One-day old specific pathogen-free chicks were inoculated with the regenerated virus, which had been obtained from transfected MSB1 cells, and compared with the chicks inoculated with IR CAV. Gross lesions in the birds inoculated with the regenerated virus illustrated the infectious nature of the regenerated virus from the cloned IR CAV DNA.
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Acknowledgements
This work was funded by Research Grant No. 2-18-18-87084 from the Directory of Research, Razi Vaccine and Serum Research Institute. The authors would like to thank Michael Wilson for his careful reading of the manuscript and insightful suggestions.
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This work was conceived, designed, performed and written by Amir Kaffashi. Fatemeh Eshratabadi helped in performing experiments. Abdelhamed Shoushtari contributed materials and reagents, supervised the development of the work and evaluated the manuscript.
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Kaffashi, A., Eshratabadi, F. & Shoushtari, A. Full-length infectious clone of an Iranian isolate of chicken anemia virus. Virus Genes 53, 312–316 (2017). https://doi.org/10.1007/s11262-016-1417-8
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DOI: https://doi.org/10.1007/s11262-016-1417-8