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Nat Genet. 2007 Jun;39(6):797-802. Epub 2007 May 27.

Spontaneous DNA breakage in single living Escherichia coli cells.

Author information

  • 1Interdepartmental Program in Cell and Molecular Biology and Department of Molecular and Human Genetics, Houston, Texas 77030-3411, USA.

Erratum in

  • Nat Genet. 2007 Sep;39(9):1174.

Abstract

Spontaneous DNA breakage is predicted to be a frequent, inevitable consequence of DNA replication and is thought to underlie much of the genomic change that fuels cancer and evolution. Despite its importance, there has been little direct measurement of the amounts, types, sources and fates of spontaneous DNA lesions in living cells. We present a direct, sensitive flow cytometric assay in single living Escherichia coli cells for DNA lesions capable of inducing the SOS DNA damage response, and we report its use in quantification of spontaneous DNA double-strand breaks (DSBs). We report efficient detection of single chromosomal DSBs and rates of spontaneous breakage approximately 20- to 100-fold lower than predicted. In addition, we implicate DNA replication in the origin of spontaneous DSBs with the finding of fewer spontaneous DSBs in a mutant with altered DNA polymerase III. The data imply that spontaneous DSBs induce genomic changes and instability 20-100 times more potently than previously appreciated. Finally, FACS demonstrated two main cell fates after spontaneous DNA damage: viability with or without resumption of proliferation.

Comment in

  • Scarce but scary. [Nat Genet. 2007]
PMID:
17529976
[PubMed - indexed for MEDLINE]
PMCID:
PMC2856310
Free PMC Article
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