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The relationship between DNA single-stranded damage response and double-stranded damage response.

Aiqing Ma1, Xianhua Dai1

  • 1a School of Electronics and Information Technology, Sun Yat-Sen University , Guangzhou 510006 , China.

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|November 22, 2017
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Summary
This summary is machine-generated.

When DNA single-stranded breaks (SSBs) and double-stranded breaks (DSBs) occur together, p53 activation and DNA repair prioritize SSBs. SSBs also more readily trigger apoptosis due to faster p53 accumulation.

Keywords:
DNA damage responseDSBSSBapoptosisdamage repairp53 response

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Area of Science:

  • Molecular Biology
  • Genetics
  • Computational Biology

Background:

  • DNA damage response pathways for single-stranded breaks (SSBs) and double-stranded breaks (DSBs) are distinct but share overlapping components.
  • Both SSB and DSB damage activate the p53 protein, influencing transcriptional and non-transcriptional regulation.
  • Competition for repair resources like RPA and ATR exists between SSB and DSB repair pathways.

Purpose of the Study:

  • To investigate the DNA damage response mechanisms when both SSBs and DSBs are present simultaneously.
  • To elucidate the interplay between p53 activation and DNA repair dynamics under combined damage conditions.
  • To explore the differential propensity for apoptosis induction by SSBs versus DSBs.

Main Methods:

  • Development of a hybrid numerical model for p53 response.
  • Creation of a hybrid numerical model for DNA damage repair.
  • Simulation of cellular responses to simultaneous SSB and DSB induction.

Main Results:

  • p53 response to combined damage is graded, with preferential activation by SSBs.
  • SSBs are repaired preferentially; simultaneous repair of SSBs and DSBs occurs after most SSBs are resolved.
  • SSBs are more likely to induce apoptosis due to faster p53 accumulation and a lower apoptosis threshold.

Conclusions:

  • The cellular response to simultaneous DNA damage exhibits a hierarchy, prioritizing SSB repair and p53 activation.
  • The findings provide insights into the complex signaling networks governing DNA repair and cell fate decisions under genotoxic stress.
  • This study highlights the critical role of SSBs in dictating the overall DNA damage response and apoptotic outcome.