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. 1986 Nov 25;14(22):8979–8995. doi: 10.1093/nar/14.22.8979

Differential repair of DNA damage in specific nucleotide sequences in monkey cells.

S A Leadon
PMCID: PMC311924  PMID: 3786142

Abstract

An immunological method was developed that isolates DNA fragments containing bromouracil in repair patches from unrepaired DNA using a monoclonal antibody that recognizes bromouracil. Cultured monkey cells were exposed to either UV light or the activated carcinogen aflatoxin B1 and excision repair of damage in DNA fragments containing the integrated and transcribed E. coli gpt gene was compared to that in the genome overall. A more rapid repair, of both UV and AFB1 damage was observed in the DNA fragments containing the E. coli gpt genes. The more efficient repair of UV damage was not due to a difference in the initial level of pyrimidine dimers as determined with a specific UV endonuclease. Consistent with previous observations using different methodology, repair of UV damage in the alpha sequences was found to occur at the same rate as that in the genome overall, while repair of AFB1 damage was deficient in alpha DNA. The preferential repair of damage in the gpt gene may be related to the functional state of the sequence and/or to alterations produced in the chromatin conformation by the integration of plasmid sequences carrying the gene.

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Selected References

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