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Genomic deletions and mutations resulting in the loss of eight genes reduce the in vivo replication capacity of Meleagrid herpesvirus 1

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Mahony, T. J., Hall, R. N., Walkden-Brown, S., Meers, J., Gravel, J. L., West, L., Hardy, V., Islam, A. F. M. F., Fowler, E. V. and Mitter, N. (2015) Genomic deletions and mutations resulting in the loss of eight genes reduce the in vivo replication capacity of Meleagrid herpesvirus 1. Virus Genes, 51 (1). pp. 85-95. ISSN 0920-8569

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Article Link: http://dx.doi.org/10.1007/s11262-015-1216-7


Meleagrid herpesvirus 1 (MeHV-1 or turkey herpesvirus) has been widely used as a vaccine in commercial poultry. Initially, these vaccine applications were for the prevention of Marek’s disease resulting from Gallid herpesvirus 2 infections, while more recently MeHV-1 has been used as recombinant vector for other poultry infections. The construction of herpesvirus infectious clones that permit propagation and manipulation of the viral genome in bacterial hosts has advanced the studies of herpesviral genetics. The current study reports the construction of five MeHV-1 infectious clones. The in vitro properties of viruses recovered from these clones were indistinguishable from the parental MeHV-1. In contrast, the rescued MeHV-1 viruses were significantly attenuated when used in vivo. Complete sequencing of the infectious clones identified the absence of two regions of the MeHV-1 genome compared to the MeHV-1 reference sequence. These analyses determined the rescued viruses have seven genes, UL43, UL44, UL45, UL56, HVT071, sorf3 and US2 either partially or completely deleted. In addition, single nucleotide polymorphisms were identified in all clones compared with the MeHV-1 reference sequence. As a consequence of one of the polymorphisms identified in the UL13 gene, four of the rescued viruses were predicted to encode a serine/threonine protein kinase lacking two of three domains required for activity. Thus four of the recovered viruses have a total of eight missing or defective genes. The implications of these findings in the context of herpesvirus biology and infectious clone construction are discussed.

Item Type:Article
Business groups:Animal Science
Keywords:Meleagrid herpesvirus 1 Replication Genome sequence Infectious clone Genomic deletion Bacterial artificial chromosome
Subjects:Science > Biology > Genetics
Animal culture > Poultry
Veterinary medicine > Veterinary virology
Live Archive:28 Jan 2016 04:41
Last Modified:03 Sep 2021 16:50

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