from Part II - Basic virology and viral gene effects on host cell functions: alphaherpesviruses
Published online by Cambridge University Press: 24 December 2009
Introduction
In this chapter the emphasis is on viral replication and on the viral gene products that define the outcome of the interaction of the alphaherpesviruses with their host. Viral replicative and host management functions account for some of the RNAs and a large number of proteins encoded by the viruses. There are, however, numerous viral gene products whose functions have not been identified or which do not play a prominent role in viral replication in the systems in which these have been tested. The objective of the table contained in this section is to summarize the functions of all known gene products and provide at least a few references for each product. It should be noted however that: of the three human alphaherpesviruses, we know more about the functions of herpes simplex virus-1 and -2 (HSV-1 and HSV -2) genes than about those of varicella zoster virus (VZV). We have identified in this table the VZV genes that are related to HSV by amino acid sequence homology. We note that partial sequence conservation does not necessarily mean that the homologous HSV and VZV gene products perform identical functions.
The list understates both the number of the products and their functions. The problem is twofold. The HSV genome encodes a large number of open reading frames (ORFs) with 50 or more codons and not all of the ORFs have been probed for to determine whether they are expressed.
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