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DNA Damage can Stall the Cell Cycle

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Alkaline Bromodeoxyuridine (BrdU) Comet Assay to Detect Replication-Associated DNA Damage.

Diego Luis Ribeiro¹, James Eduardo Lago Londero¹, Davi Jardim Martins²

¹Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil.

Current Protocols

|December 11, 2025

Summary

This study details an optimized alkaline BrdU comet assay for detecting DNA damage in newly synthesized DNA strands. The method specifically measures replication-associated DNA breaks in unsynchronized human cells, aiding DNA repair studies.

Keywords:

alkaline BrdU comet assay fork progression kinetics genomic instability replication stress replicative DNA damage

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A High-Throughput Comet Assay Approach for Assessing Cellular DNA Damage

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A High-Throughput Comet Assay Approach for Assessing Cellular DNA Damage

A High-Throughput Comet Assay Approach for Assessing Cellular DNA Damage

Published on: May 10, 2022

Area of Science:

Molecular Biology
Genetics
Cell Biology

Background:

DNA replication is vulnerable to damage, leading to genomic instability.
Detecting DNA damage in newly synthesized DNA is crucial for understanding cellular responses to replication stress.
Existing methods may lack specificity or require cell synchronization.

Purpose of the Study:

To present an optimized and accessible alkaline BrdU comet assay protocol.
To enable specific detection of DNA strand breaks in newly replicated DNA during S phase.
To differentiate replication-associated DNA damage from overall genomic damage in unsynchronized human cells.

Main Methods:

Utilized alkaline BrdU comet assay, combining bromodeoxyuridine pulse-labeling with alkaline single-cell gel electrophoresis.
Employed fluorescence immunodetection for specific identification of DNA damage in nascent DNA strands.
Applied the protocol to unsynchronized human cells (RPE-1 h-TERT TP53 KO) and translesion-synthesis-deficient fibroblasts after exposure to hydroxyurea (HU) and ultraviolet-C (UV-C) radiation.

Main Results:

The protocol successfully detects and measures DNA strand breaks in newly replicated DNA.
Demonstrated application in human cells and translesion-synthesis-deficient fibroblasts.
Supported time-course chase experiments to monitor DNA damage kinetics in nascent DNA strands.

Conclusions:

The alkaline BrdU comet assay provides a specific, high-resolution, and cost-effective method for studying replication stress.
This protocol is valuable for assessing post-replication DNA repair and DNA damage tolerance mechanisms.
The method adheres to MIRCA guidelines and ICAW objectives, ensuring reproducibility and standardization.