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This study presents a new method for real-time imaging of cellular responses to DNA double-strand breaks (DSBs) induced by particle radiation. The technique allows visualization of key protein accumulation at DSBs, revealing asynchronous signaling dynamics.

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Area of Science:

  • Radiobiology
  • Cellular Biology
  • Medical Physics

Background:

  • Cellular responses to DNA double-strand breaks (DSBs) are crucial for maintaining genomic integrity and determining cancer treatment efficacy.
  • The complexity of DNA lesions influences the activation of DSB detection, signaling, and repair mechanisms.
  • Studying these responses, particularly to particle radiation, requires reliable methods for inducing and visualizing DSBs and their downstream effects.

Purpose of the Study:

  • To develop a straightforward approach for real-time imaging of early cellular responses to particle-induced DNA damage.
  • To overcome the challenges of visualizing early-stage cellular responses to particle radiation at accelerator facilities.
  • To analyze the accumulation dynamics of key DSB signaling factors at individual DNA lesions.

Main Methods:

  • Utilized a transportable setup with an inverted fluorescence confocal microscope, angled relative to the particle beam for simultaneous irradiation and imaging.
  • Irradiated cells with 254 MeV alpha particles to induce DNA double-strand breaks (DSBs).
  • Imaged and analyzed the accumulation of fluorescently tagged MDC1, RNF168, and 53BP1 proteins at induced DSBs.

Main Results:

  • Demonstrated the technical feasibility of real-time imaging of early cellular responses to particle-induced DNA damage.
  • Observed the accumulation of MDC1, RNF168, and 53BP1 proteins at DNA lesions induced by alpha particles.
  • Revealed asynchronous initiation of protein accumulation at different individual DSBs, indicating complex signaling dynamics.

Conclusions:

  • The developed imaging approach enables real-time visualization of early cellular responses to particle-induced DNA damage.
  • The findings highlight the asynchronous nature of key DSB signaling protein recruitment to individual DNA lesions.
  • This method provides a valuable tool for radiobiology research and understanding cancer treatment responses.