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. 1991 Nov;65(11):6320–6324. doi: 10.1128/jvi.65.11.6320-6324.1991

Cloning, sequencing, and functional analysis of a Marek's disease virus origin of DNA replication.

H S Camp 1, P M Coussens 1, R F Silva 1
PMCID: PMC250344  PMID: 1656099

Abstract

Previously, we isolated a replicon from a defective Marek's disease virus (MDV), analogous to defective herpes simplex viruses (amplicons). Defective viruses contain cis-acting elements required for DNA synthesis and virus propagation such as an origin of DNA replication and a packaging-cleavage signal site. In this report, the MDV replicon was utilized to locate an origin of MDV DNA replication. A comparison of MDV replicon sequences with other herpesvirus replication origin sequences revealed a 90-bp sequence containing 72% identity to the lytic origin (oris) of herpes simplex virus type 1. This 90-bp sequence displayed no similarity to betaherpesvirus or gammaherpesvirus replication origins. The 90-bp sequence is arranged as an imperfect palindrome centered around an A+T-rich region. This sequence also contains a 9-bp motif (5'CGTTCGCAC3') highly conserved in alphaherpesvirus replication origins. To test functionality of the 90-bp putative MDV replication origin, we conducted DpnI replication assays with subclones generated from the 4-kbp MDV replicon. A 700-bp MDV replicon subfragment containing the 90-bp putative MDV replication origin sequence is capable of replicating in chicken embryo fibroblast cells cotransfected with helper virus DNA. In conclusion, we identified a functional origin of DNA replication in MDV. Similarity of MDV origin sequences to those of alphaherpesviruses supports the current contention that MDV is more closely related to alphaherpesviruses than to gammaherpesviruses.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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