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. 1984 Dec 21;12(24):9237–9248. doi: 10.1093/nar/12.24.9237

The complete pattern of mutagenesis arising from the repair of site-specific psoralen crosslinks: analysis by oligonucleotide hybridization.

W A Saffran, C R Cantor
PMCID: PMC320457  PMID: 6514576

Abstract

Psoralen crosslinks were site-specifically placed in plasmid pBR322 near the BamHI site in the tet gene by enzymatically inserting mercurated nucleotides and reacting at the target site with a sulfhydryl-containing psoralen. The damaged plasmid was repaired in SOS-induced E. coli cells. Mutants were detected by colony hybridization to oligonucleotides in the target region, and their sequences were determined. The mutations are all base substitutions, 80% transitions and 20% transversions, similar to the mutations previously identified by the loss of tetracycline resistance. However, the mutation sites detected by a physical method, unconstrained by phenotypic changes, follow a broader distribution than those identified genetically. They occur primarily at favored psoralen crosslinking sites, where T-T and T-C interstrand crosslinks can be formed. A majority of these mutations are silent.

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Selected References

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