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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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