Summary
We have studied the increase in mutation in mutagenized lambda phage when the host cells are also irradiated with ultraviolet light, “Weigle mutagenesis.” The increase in mutation is induced mainly by coincidences between a radiation-produced lesion in one strand of the host cell DNA and a second lesion in the complementary strand. This conclusion is based on experiments in which incorporation of the base analog bromouracil sensitized the host cells to ultraviolet light. For the same number of bromouracils incorporated per cell, uniform substitution gave a higher level of Weigle mutagenesis than did substitution in only one strand of the DNA double helix. The data also show some induction of Weigle mutagenesis by processes linear in ultraviolet fluence; possibilities include: lesions involving both complementary strands such as crosslinks, lesions in one strand opposite pre-existing discontinuities in the complementary strand, and very small contributions to induction from lesions in one strand only of the DNA.
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Communicated by B.A. Bridges
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Hutchinson, F., Stein, J. Mutagenesis of lambda phage: Weigle mutagenesis is induced by coincident lesions in the double helical DNA of the host cell genome. Molec. Gen. Genet. 181, 458–463 (1981). https://doi.org/10.1007/BF00428736
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DOI: https://doi.org/10.1007/BF00428736