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Journal of Virology, August 2006, p. 7863-7872, Vol. 80, No. 16
0022-538X/06/$08.00+0     doi:10.1128/JVI.00134-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Psittacid Herpesvirus 1 and Infectious Laryngotracheitis Virus: Comparative Genome Sequence Analysis of Two Avian Alphaherpesviruses

Dean R. Thureen and Calvin L. Keeler Jr.*

Department of Animal and Food Sciences, College of Agriculture and Natural Resources, University of Delaware, Newark, Delaware 19716-2150

Received 20 January 2006/ Accepted 19 May 2006

Psittacid herpesvirus 1 (PsHV-1) is the causative agent of Pacheco's disease, an acute, highly contagious, and potentially lethal respiratory herpesvirus infection in psittacine birds, while infectious laryngotracheitis virus (ILTV) is a highly contagious and economically significant avian herpesvirus which is responsible for an acute respiratory disease limited to galliform birds. The complete genome sequence of PsHV-1 has been determined and compared to the ILTV sequence, assembled from published data. The PsHV-1 and ILTV genomes exhibit similar structural characteristics and are 163,025 bp and 148,665 bp in length, respectively. The PsHV-1 genome contains 73 predicted open reading frames (ORFs), while the ILTV genome contains 77 predicted ORFs. Both genomes contain an inversion in the unique long region similar to that observed in pseudorabies virus. PsHV-1 is closely related to ILTV, and it is proposed that it be assigned to the Iltovirus genus. These two avian herpesviruses represent a phylogenetically unique clade of alphaherpesviruses that are distinct from the Marek's disease-like viruses (Mardivirus). The determination of the complete genomic nucleotide sequences of PsHV-1 and ILTV provides a tool for further comparative and functional analysis of this unique class of avian alphaherpesviruses.

* Corresponding author. Mailing address: Department of Animal and Food Sciences, University of Delaware, Newark, DE 19716-2150. Phone: (302) 831-2524. Fax: (302) 831-2822. E-mail: ckeeler{at}udel.edu.

Journal of Virology, August 2006, p. 7863-7872, Vol. 80, No. 16
0022-538X/06/$08.00+0     doi:10.1128/JVI.00134-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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