DNA Double-Strand Break Repair Kinetics after Exposure to Photons and Ions: A Systematic Review

Area of Science:

• Radiobiology
• Molecular Biology
• Radiation Oncology

Background:

• DNA double-strand breaks (DSB) are critical lesions induced by ionizing radiation.
• Accurate assessment of DSB repair kinetics is crucial for understanding cellular responses to radiation and optimizing radiotherapy.
• Variability in experimental methodologies complicates the direct comparison of DSB repair data across studies.

Purpose of the Study:

• To compile and analyze a comprehensive database of DNA DSB repair kinetics from published literature.
• To investigate the influence of various experimental parameters on DSB repair kinetics.
• To identify inconsistencies in reporting and suggest standardized parameters for future research.

Main Methods:

• Systematic literature review and data compilation of 285 DNA DSB repair experiments.
• Development of a database including experiments with photons and various ions (hydrogen to iron).
• Application of filtering criteria to compare repair kinetics across different cell types (normal, tumor, repair-deficient) and radiation types.

Main Results:

• The study identified significant variability in DNA DSB repair kinetics influenced by experimental parameters.
• Comparisons were made between human/animal normal and tumor cells, and different radiation types.
• Data from repair-deficient cell lines were included to contextualize findings.

Conclusions:

• Precise reporting of experimental parameters is essential for reproducible and comparable DSB repair studies.
• Gaps in the literature were identified, particularly concerning clinically relevant questions in radiotherapy.
• The compiled database provides a valuable resource for researchers investigating DNA repair mechanisms and radiation effects.