Multicolor Laser Scanning Confocal Immunofluorescence Microscopy of DNA Damage Response Biomarkers

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• DNA damage from internal and external sources threatens genetic integrity in somatic and germ cells.
• The DNA-damage response (DDR) is a crucial cellular mechanism for sensing, signaling, and repairing DNA lesions.
• Dysfunctional DDR signaling is linked to various human diseases, including cancer, making DDR assessment a vital biomarker.

Purpose of the Study:

• To develop and describe experimental protocols for quantifying key DNA-damage response (DDR) events.
• To maintain spatial information within nuclei during quantitative assessment of DDR.
• To demonstrate the application of the method in both somatic and germ cells.

Main Methods:

• Utilizing laser scanning confocal immunofluorescence microscopy (LSCIM) on three-dimensionally preserved nuclei.
• Simultaneously detecting key DDR proteins: Rad50, phosphorylated H2AX, and ATM.
• Applying quantitative LSCIM for high-resolution analysis of DDR in intact nuclear architecture.

Main Results:

• Established protocols for high-resolution, quantitative assessment of individual DDR events.
• Demonstrated the ability of LSCIM to preserve spatial information within nuclei.
• Successfully applied the method to analyze DDR in both somatic and germ cells.

Conclusions:

• LSCIM provides a quantitative method to assess DDR events while preserving nuclear architecture and spatial information.
• This technique serves as a valuable tool for biomonitoring and assessing human health and disease risk.
• The described protocols enable detailed analysis of DDR in various cell types.