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Evolutionary comparisons of the S segments in the genomes of Herpes Simplex virus type 1 and Varicella-Zoster virus

Davison, A.J., and McGeoch, D.J. (1986) Evolutionary comparisons of the S segments in the genomes of Herpes Simplex virus type 1 and Varicella-Zoster virus. Journal of General Virology, 67 (4). pp. 597-611. ISSN 0022-1317 (doi:10.1099/0022-1317-67-4-597)

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Publisher's URL: http://dx.doi.org/10.1099/0022-1317-67-4-597

Abstract

The genomes of herpes simplex virus type 1 (HSV-1) and varicella-zoster virus (VZV) consist of two covalently joined segments, L and S. Each segment comprises an unique sequence flanked by inverted repeats. We have reported previously the DNA sequences of the S segments in these two genomes, and have identified protein-coding regions therein. In HSV-1, the unique sequence of S contains ten entire genes plus the major parts of two more, and each inverted repeat contains one entire gene; in VZV, the unique sequence of S contains two entire genes plus the major parts of two more, and each inverted repeat contains three entire genes. In this report, an examination of polypeptide sequence homology has shown that each VZV gene has an HSV-1 counterpart, but that six of the HSV-1 genes have no VZV homologues. Thus, although these regions of the two genomes differ in gene layout, they are related to a significant degree. The analysis indicates that the inverted repeats are evidently capable of large-scale expansion or contraction during evolution. The differences in gene layout can be understood as resulting from a small number of recombinational events during the descent of HSV-1 and VZV from a common ancestor.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):McGeoch, Prof Duncan and Davison, Dr Andrew
Authors: Davison, A.J., and McGeoch, D.J.
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:Journal of General Virology
Journal Abbr.:J. Gen. Virol.
Publisher:Society for General Microbiology
ISSN:0022-1317
ISSN (Online):1465-2099

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