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Journal of Virology, October 2004, p. 10755-10764, Vol. 78, No. 19
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.19.10755-10764.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Phylogenetic Analysis of Clinical Herpes Simplex Virus Type 1 Isolates Identified Three Genetic Groups and Recombinant Viruses

Peter Norberg,* Tomas Bergström, Elham Rekabdar, Magnus Lindh, and Jan-Åke Liljeqvist

Department of Virology, Göteborg University, Göteborg, Sweden

Received 3 March 2004/ Accepted 20 May 2004

Herpes simplex virus type 1 (HSV-1) is a ubiquitous human pathogen which establishes lifelong infections. In the present study, we determined the sequence diversity of the complete genes coding for glycoproteins G (gG), I (gI), and E (gE), comprising 2.3% of the HSV-1 genome and located within the unique short (US) region, for 28 clinical HSV-1 isolates inducing oral lesions, genital lesions, or encephalitis. Laboratory strains F and KOS321 were sequenced in parallel. Phylogenetic analysis, including analysis of laboratory strain 17 (GenBank), revealed that the sequences were separated into three genetic groups. The identification of different genogroups facilitated the detection of recombinant viruses by using specific nucleotide substitutions as recombination markers. Seven of the isolates and strain 17 displayed sequences consistent with intergenic recombination, and at least four isolates were intragenic recombinants. The observed frequency of recombination based on an analysis of a short stretch of the US region suggests that most full-length HSV-1 genomes consist of a mosaic of segments from different genetic groups. Polymorphic tandem repeat regions, consisting of two to eight blocks of 21 nucleotides in the gI gene and seven to eight repeats of 3 nucleotides in the gG gene, were also detected. Laboratory strain KOS321 displayed a frameshift mutation in the gI gene with a subsequent alteration of the deduced intracellular portion of the protein. The presence of polymorphic tandem repeat regions and the different genogroup identities can be used for molecular epidemiology studies and for further detection of recombination in the HSV-1 genome.

* Corresponding author. Mailing address: Department of Virology, University of Göteborg, Guldhedsgatan 10 B, S-413 46 Göteborg, Sweden. Phone: (46) 31 3424615. Fax: (46) 31 3424960. E-mail: peter.norberg{at}microbio.gu.se.

Journal of Virology, October 2004, p. 10755-10764, Vol. 78, No. 19
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.19.10755-10764.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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