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Impairment of infectious laryngotracheitis virus replication by deletion of the UL[-1] gene

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Abstract

Infectious laryngotracheitis virus (ILTV) encodes several unique genes, including a pair of unique nuclear proteins UL0 and UL[-1] that are expressed during replication in cell culture. Although the UL0 gene has been shown to be dispensable for replication, the role of UL[-1] has not been elucidated. In this study a deletion mutant of ILTV lacking the UL[-1] gene was constructed using homologous recombination. The coding sequences of the gene were replaced with the gene for enhanced green fluorescent protein and the cytomegalovirus major immediate early promoter element. The progeny virus carrying the reporter gene was readily identified using fluorescent microscopy, but was unable to propagate in the permissive cells in the absence of wild type ILTV. Even after plaque purification and fluorescent associated cell sorting the recombinant virus deficient in UL[-1] gene could not be successfully isolated. Our findings suggest that the UL[-1] gene has an important role in ILTV replication.

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Acknowledgements

The authors thank Mr. Nino Ficorilli for the cell culture expertise and Ms Cynthia Brown for excellent technical support.

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Correspondence to C. A. Hartley.

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The authors have no conflict of interest to declare. This work in this project was not funded by a specific funding body or source of funds. This manuscript represents an accurate account of the work performed. This study represents original work that has not been submitted to any other journal for publication. No human or animal ethics approval was required for the completion of this study.

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Nadimpalli, M., Lee, S.W., Devlin, J.M. et al. Impairment of infectious laryngotracheitis virus replication by deletion of the UL[-1] gene. Arch Virol 162, 1541–1548 (2017). https://doi.org/10.1007/s00705-017-3266-8

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