Abstract
Full-length genome sequencing of pathogenic and attenuated (for chickens) avian coronavirus infectious bronchitis virus (IBV) strains of the same serotype was conducted to identify genetic differences between the pathotypes. Analysis of the consensus full-length genome for three different IBV serotypes (Ark, GA98, and Mass41) showed that passage in embryonated eggs, to attenuate the viruses for chickens, resulted in 34.75–43.66% of all the amino acid changes occurring in nsp 3 within a virus type, whereas changes in the spike glycoprotein, thought to be the most variable protein in IBV, ranged from 5.8 to 13.4% of all changes. The attenuated viruses did not cause any clinical signs of disease and had lower replication rates than the pathogenic viruses of the same serotype in chickens. However, both attenuated and pathogenic viruses of the same serotype replicated similarly in embryonated eggs, suggesting that mutations in nsp 3, which is involved in replication of the virus, might play an important role in the reduced replication observed in chickens leading to the attenuated phenotype.




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Abbreviations
- IBV:
-
Infectious bronchitis virus
- RTC:
-
Replication transcription complex
- PLP:
-
Papain-like protease
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Acknowledgments
This work was supported by USDA, CSREES award number 2007-35600-17786. The authors appreciate the assistance that was provided by Lauren Byrd, Carey Stewart, and Joshua Jackwood in conducting these studies.
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Phillips, J.E., Jackwood, M.W., McKinley, E.T. et al. Changes in nonstructural protein 3 are associated with attenuation in avian coronavirus infectious bronchitis virus. Virus Genes 44, 63–74 (2012). https://doi.org/10.1007/s11262-011-0668-7
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DOI: https://doi.org/10.1007/s11262-011-0668-7


