A Comparison of the Genomes of Bovine Herpesvirus Type 1 and Pseudorabies Virus

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Abstract
Summary The DNA sequence homology between bovine herpesvirus type 1 (BHV-1) and pseudorabies virus (PRV) was examined. Reciprocal cross-hybridization of viral DNA labelled by nick translation to Southern blots of restriction endonuclease-digested DNA detected homologous sequences dispersed throughout the genomes of the two viruses. The DNA-DNA hybrids formed were stable under high-stringency wash conditions. Sequences of a 32P-labelled PRV DNA fragment probe were found to hybridize only to a specific region of the BHV-1 genome, suggesting that the detected sequence homology was not due to fortuitous hybridization of G + C-rich sequences. As measured by liquid reassociation kinetics the homology between these two viruses was approximately 8%.

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