title: Molecular cloning of equine herpesvirus type 1 DNA: analysis of standard and defective viral genomes and viral sequences in oncogenically transformed cells.
abstract: 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.
mesh_terms: D000818:Animals; D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D002472:Cell Transformation, Viral; D003001:Cloning, Molecular; D006224:Cricetinae; D004262:DNA Restriction Enzymes; D004274:DNA, Recombinant / Q000378:metabolism; D004279:DNA, Viral / Q000235:genetics*; D004622:Embryo, Mammalian; D004926:Escherichia coli / Q000235:genetics; D006564:Herpesviridae / Q000235:genetics*; D009693:Nucleic Acid Hybridization; D010957:Plasmids
chemical_list: D004274:DNA, Recombinant; D004279:DNA, Viral; D004262:DNA Restriction Enzymes