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. 1975 Nov;72(11):4265–4269. doi: 10.1073/pnas.72.11.4265

Enzymatic induction of DNA double-strand breaks in gamma-irradiated Escherichia coli K-12.

T Bonura, K C Smith, H S Kaplan
PMCID: PMC388701  PMID: 1105577

Abstract

The polA1 mutation increases the sensitivity of E. coli K-12 by killing by gamma-irradiation in air by a factor of 2.9 and increases the yield of DNA double-strand breaks by a factor of 2.5. These additional DNA double-strand breaks appear to be due to the action of nucleases in the polA1 strain rather than to the rejoining of radiation-induced double-strand breaks in the pol+ strain. This conclusion is based upon the observation that gamma-irradiation at 3 degrees did not affect the yield of DNA double-strand breaks in the pol+ strain, but decreased the yield in the polA1 strain by a factor of 2.2. Irradiation of the polA1 strain at 3 degrees followed by incubation at 3 degrees for 20 min before plating resulted in approximately a 1.5-fold increase in the D0. The yield of DNA double-strand breaks was reduced by a factor of 1.5. The pol+ strain, however, did not show the protective effect of the low temperature incubation upon either survival or DNA double-strand breakage. We suggest that the increased yield of DNA double-strand breaks in the polA1 strain may be the result of the unsuccessful exision repair of ionizing radiation-induced DNA base damage.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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