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Insertion mutants of herpes simplex virus type 1, containing a second copy of the sequences of BamHI fragment L (map coordinates 0.706 to 0.744) inserted in inverted orientation into the thymidine kinase gene (at map coordinate 0.315), have been further characterized. We reported previously that, as a result of intramolecular or intermolecular recombination between copies of the BamHI-L sequence at the normal locus and inserted locus, a high proportion of progeny genomes exhibited either inversions of the unique sequence flanked by these inverted repeats or other rearrangements. Now we report that a genetic marker (syn-1 or syn-1+) originally present only in the inserted copy of BamHI fragment L appears in progeny at both the normal and inserted loci, and vice versa, at high frequency. Because these phenomena have not been observed with other insertion mutants containing duplications of other sequences from unique regions of the genome, we conclude that BamHI fragment L contains an element that enhances the rate of homologous recombination in adjacent sequences, resulting in genome rearrangements and gene conversion-like events.

Enhanced rate of conversion or recombination of markers within a region of unique sequence in the herpes simplex virus genome