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Related Experiment Video

Updated: Jun 5, 2026

Visualization of UV-induced Replication Intermediates in E. coli using Two-dimensional Agarose-gel Analysis

Visualization of UV-induced Replication Intermediates in E. coli using Two-dimensional Agarose-gel Analysis

Published on: December 21, 2010

Visualization of UV-induced replication intermediates in E. coli using two-dimensional agarose-gel analysis.

H Arthur Jeiranian¹, Brandy J Schalow, Justin Courcelle

¹Department of Biology, Portland State University, USA.

Journal of Visualized Experiments : Jove

|January 6, 2011

Summary

DNA damage hinders accurate DNA replication, leading to mutations and cancer. This study reveals how replication forks temporarily reverse to handle UV-induced DNA lesions in E. coli, stabilizing with RecA and RecF pathway proteins.

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Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

Inaccurate DNA replication in the presence of DNA damage causes cellular rearrangements and mutagenesis.
This process is linked to human cancer development.
UV irradiation-induced DNA damage impairs accurate genomic template duplication during replication.

Purpose of the Study:

To investigate how proteins process DNA lesions during replication in vivo.
To identify structural intermediates arising from replication encountering DNA damage.
To elucidate the mechanism of replication fork stabilization and lesion processing.

Main Methods:

Utilized Escherichia coli as a model system.
Employed two-dimensional agarose-gel electrophoresis.
Analyzed replicating plasmids in vivo following UV-induced DNA damage to identify structural intermediates.

Main Results:

Developed a procedure to identify structural intermediates during replication fork progression in vivo.
Demonstrated that replication forks blocked by UV damage undergo transient reversal.
Showed that this reversal is stabilized by RecA and RecF pathway proteins.

Conclusions:

Replication fork reversal is a key mechanism for handling DNA lesions during replication.
RecA and RecF pathway proteins play crucial roles in stabilizing these reversed forks.
Replication intermediates are maintained until DNA lesions are repaired by nucleotide excision repair, allowing replication to resume.