Imaging Approach to DNA Damage Induction and Quantification.

Area of Science:

• Cell biology
• Molecular biology
• Microscopy

Background:

• Immunofluorescence microscopy provides superior image quality for fixed cells compared to live-cell imaging.
• Quantifying DNA damage, particularly DNA double-strand breaks (DSBs), is challenging in living cells due to a lack of reliable methods.

Purpose of the Study:

• To describe a comprehensive workflow for inducing DNA damage in cell culture.
• To detail methods for fixation, staining, and analysis of DNA double-strand breaks (DSBs) using immunofluorescence.
• To provide troubleshooting guidance for image segmentation and analysis.

Main Methods:

• Induction of DNA damage in cultured cells.
• Standard cell fixation and immunofluorescence staining protocols.
• Image analysis techniques for quantifying DNA double-strand breaks (DSBs).
• Troubleshooting common issues in image segmentation and analysis.

Main Results:

• A robust workflow for DNA damage induction and analysis was established.
• High signal-to-noise imaging and accurate quantification of DNA double-strand breaks (DSBs) were achieved.
• Common challenges in image segmentation and analysis were addressed with practical solutions.

Conclusions:

• The described immunofluorescence workflow is effective for analyzing DNA double-strand breaks (DSBs) in fixed cells.
• This method offers a reliable alternative for DNA damage quantification when live-cell approaches are limited.
• The provided troubleshooting tips enhance the reproducibility and success rate of image analysis.