Related Experiment Video
Updated: Aug 4, 2026

Visualization of UV-induced Replication Intermediates in E. coli using Two-dimensional Agarose-gel Analysis
Published on: December 21, 2010
The dampening of DNA replication cycles after x-irradiation or ultraviolet irradiation
Abstract:
Escherichia coli strains 15T(-) (555-7) and B/r were grown in the presence of thymine-(14)C to label all DNA. The ability of these parental DNA's to undergo cycles of replication subsequent to cellular irradiation with either X-ray or ultraviolet light (UV) was followed with density labels. Exposed cells were shifted into the density medium at times which were approximately multiples of normal rounds of DNA replication. A portion of the parental DNA, replicated semiconservatively once during an initial cycle following UV or X-irradiation in E. coli, failed to replicate again within the time studied. The time course of semiconservative parental DNA replication is altered.
Related Concept Videos
Overview of DNA Repair
Chemically...
DNA Damage can Stall the Cell Cycle
Restarting Stalled Replication Forks
Mutations
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Nucleotide Excision Repair
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
DNA Damage Can Stall the Cell Cycle

