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Genomic DNA sequences of equine herpesvirus type 1 (EHV-1) have been cloned as BamHI and EcoRI restriction fragments into the plasmid pBR322 and propagated in Escherichia coli. With the exception of two EcoRI restriction fragments that reside in the S region of the viral genome, all of the cloned fragments demonstrated the same electrophoretic mobilities, restriction cleavage sites, and blot-hybridization patterns as did the parent fragments produced by BamHI or EcoRI digestion of virion DNA. The EcoRI J fragment and the BamHI E fragment of the L-region terminus were cloned after the addition of appropriate linker oligonucleotides. Fragments originating from each of the two isomeric forms of EHV-1 DNA were contained in this library of clones. Supramolar DNA fragments present only in the DNA of defective interfering (DI) particles of EHV-1 were generated from Bgl II digestion of DNA preparations enriched for EHV-1 DI particles and were cloned as Bgl II and EcoRI fragments into the plasmid vector. The cloned viral sequences represented in this defective genome mapped to the S region of EHV-1 DNA. Blot-hybridization analysis of EHV-1 transformed and tumor cell DNAs with the cloned BamHI B fragment confirmed that subgenomic viral sequences are present and indicated that those sequences map to the viral genome between 0.32 and 0.43 map unit.

proceedings of the national academy of sciences of the united states of america

Molecular cloning of equine herpesvirus type 1 DNA: analysis of standard and defective viral genomes and viral sequences in oncogenically transformed cells.