Time-Dependent 53BP1 Foci Kinetics in X-Irradiated Human Hair Follicle Dermal Papilla Cells

The study examines the kinetics of 53BP1 foci in human hair follicle dermal papilla cells after X-ray irradiation, highlighting their potential for biological dosimetry. It finds that 53BP1 foci increase in a dose-dependent manner shortly after irradiation, with significant dose-response relationships up to 1000 mGy. By 24 hours, foci counts at lower doses return to baseline, but larger foci persist at higher doses, providing a reliable marker for dose estimation. The research suggests that these cells can be used for noninvasive dose estimation, offering a promising method for biological dosimetry and medical triage, especially in nuclear disaster scenarios. The study involved analyzing 29 to 325 cells per condition to ensure statistical reliability, and further validation with intact hair samples is recommended.