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Journal of Virology, October 1999, p. 8040-8052, Vol. 73, No. 10
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Human Herpesvirus 6B Genome Sequence: Coding Content and Comparison with Human Herpesvirus 6A

Geraldina Dominguez,1 Timothy R. Dambaugh,2 Felicia R. Stamey,1 Stephen Dewhurst,3 Naoki Inoue,1 and Philip E. Pellett1,*

Centers for Disease Control and Prevention, Atlanta, Georgia 303331; Qualicon, Inc., Wilmington, Delaware 198802; and University of Rochester Medical Center, Rochester, New York, 146423

Received 12 April 1999/Accepted 10 June 1999

Human herpesvirus 6 variants A and B (HHV-6A and HHV-6B) are closely related viruses that can be readily distinguished by comparison of restriction endonuclease profiles and nucleotide sequences. The viruses are similar with respect to genomic and genetic organization, and their genomes cross-hybridize extensively, but they differ in biological and epidemiologic features. Differences include infectivity of T-cell lines, patterns of reactivity with monoclonal antibodies, and disease associations. Here we report the complete genome sequence of HHV-6B strain Z29 [HHV-6B(Z29)], describe its genetic content, and present an analysis of the relationships between HHV-6A and HHV-6B. As sequenced, the HHV-6B(Z29) genome is 162,114 bp long and is composed of a 144,528-bp unique segment (U) bracketed by 8,793-bp direct repeats (DR). The genomic sequence allows prediction of a total of 119 unique open reading frames (ORFs), 9 of which are present only in HHV-6B. Splicing is predicted in 11 genes, resulting in the 119 ORFs composing 97 unique genes. The overall nucleotide sequence identity between HHV-6A and HHV-6B is 90%. The most divergent regions are DR and the right end of U, spanning ORFs U86 to U100. These regions have 85 and 72% nucleotide sequence identity, respectively. The amino acid sequences of 13 of the 17 ORFs at the right end of U differ by more than 10%, with the notable exception of U94, the adeno-associated virus type 2 rep homolog, which differs by only 2.4%. This region also includes putative cis-acting sequences that are likely to be involved in transcriptional regulation of the major immediate-early locus. The catalog of variant-specific genetic differences resulting from our comparison of the genome sequences adds support to previous data indicating that HHV-6A and HHV-6B are distinct herpesvirus species.


* Corresponding author. Mailing address: Centers for Disease Control and Prevention, 1600 Clifton Road, MS G18, Atlanta, GA 30333. Phone: (404) 639-2186. Fax: (404) 639-0049. E-mail: php1{at}cdc.gov.


Journal of Virology, October 1999, p. 8040-8052, Vol. 73, No. 10
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.



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