Abstract
We have identified two regions of the herpes simplex virus type 1 (HSV-1) genome that inhibit DNA-mediated transformation of thymidine kinase-less L (Ltk-) cells by the cloned HSV-1 tk gene. When plasmids containing the EcoRI fragments EK or JK were mixed at 30 fmol/ml with the tk gene and transfected into Ltk- cells, the frequency of transformation was inhibited 80 to more than 90% relative to the control. Of the remaining 10 EcoRI fragments of the HSV-1 genome, 8 were inactive and 2 were weakly active. A 6.1-kilobase PstI subclone between 0.743 and 0.782 map units was isolated from pEK. This clone, pEK-P3P4, exhibited antitransformation activity toward HSV-1 tk and also the bacterial genes gpt and neo. pEK-P3P4 contains the alpha 27 gene, and restriction endonuclease inactivation and subcloning studies established that alpha 27 alone did not inhibit transformation. However, alpha 27 plus sequences both upstream and downstream of alpha 27 did inhibit transformation. In addition, alpha 0 or alpha 4 could substitute for alpha 27 in effecting antitransformation with these sequences. Therefore, an alpha gene and two additional loci in pEK-P3P4 are required for antitransformation. A second antitransforming locus in the reiterated sequences common to EK and JK and distinct from those in pEK-P3P4 was also identified but not characterized in detail. How antitransformation may be an expression of regulation of viral and host cell gene expression is discussed.
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