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. 1989 Mar;63(3):1275–1283. doi: 10.1128/jvi.63.3.1275-1283.1989

Functional mapping and DNA sequence of an equine herpesvirus 1 origin of replication.

R P Baumann 1, V R Yalamanchili 1, D J O'Callaghan 1
PMCID: PMC247824  PMID: 2536833

Abstract

The genome of equine herpesvirus 1 (EHV-1) defective interfering (DI) particle DNA originates from discrete regions within the standard (STD) EHV-1 genome: the left terminus (0.0 to 0.04 map units) and the inverted repeats (0.78 to 0.79 and 0.83 to 0.87 map units of the internal inverted repeat; 0.91 to 0.95 and 0.99 to 1.00 map units of the terminal inverted repeat). Since DI DNA must contain cis-acting DNA sequences, such as replication origins, which cannot be supplied in trans by the STD EHV-1 virus, regions of the EHV-1 genome shown to be in DI DNA were assayed for the presence of a viral origin of DNA replication. Specifically, STD EHV-1 DNA fragments encompassing the genomic regions present in DI particle DNA were inserted into the vector pAT153, and individual clones were tested by transfection assays for the ability to support the amplification and replication of plasmid DNA in EHV-1-infected cells. The Sma-1 subfragment of the internal inverted repeat sequence (0.83 to 0.85 map units) was shown to contain origin of replication activity. Subcloning and BAL 31 deletion analysis of the 2.35-kilobase-pair (kbp) Sma-1 fragment delineated a 200-bp fragment that contained origin activity. The origin activities of all EHV-1 clones which were positive by the transfection assay were confirmed by methylation analysis by using the methylation-sensitive restriction enzymes DpnI and MboI. DNA sequencing of the 200-bp fragment which contained an EHV-1 origin of replication indicated that this region has significant homology to previously characterized origins of replication of human herpesviruses. Furthermore, comparison of known origin sequences demonstrated that a 9-bp sequence, CGTTCGCAC, which is conserved among all origins of replication of human lytic herpesviruses and which is contained within the 18-bp region in herpes simplex virus type 1 origins shown by others to be protected by an origin-binding protein (P. Elias, M. E. O'Donnell, E. S. Mocarski, and I. R. Lehman, Proc. Natl. Acad. Sci. USA 83:6322-6326) is also conserved across species in the EHV-1 origin of replication.

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Selected References

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