1887

Abstract

The entire genome of human herpesvirus 6 (HHV-6) strain U1102 was cloned as overlapping fragments in cosmid and plasmid vectors. Cleavage maps were constructed for the restriction endonucleases HI, RI, I and I. The genome of HHV-6 U1102 is a linear dsDNA of 163 kbp, consisting of a long unique 142 kbp region flanked by direct terminal repeats of 10.5 kbp. Short stretches (290 to 470 nucleotides) of DNA, four from the terminal repeats and 55 from the U region, were sequenced and compared by computer with the known herpesvirus amino acid sequences. Homologies were found for 10 open reading frames that are scattered over the U region of HHV-6. Their relative positions and orientations indicate that the unique region of HHV-6 is essentially collinear with the U region of human cytomegalovirus (HCMV), but is not collinear with the other human herpesviruses. It confirms and extends earlier observations that HHV-6 is more closely related to the β-herpesvirus HCMV, suggesting that HHV-6 may be considered as the prototype of a new β-herpesvirus subgroup.

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1991-09-01
2021-10-19
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