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c-Abl downregulates the slow phase of double-strand break repair

V Meltser1, M Ben-Yehoyada, N Reuven

  • 1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel.

Cell Death & Disease
|March 3, 2011
PubMed

Insights

The c-Abl tyrosine kinase inhibits the slow repair of DNA double-strand breaks (DSBs). Inhibiting c-Abl enhances DNA repair and cellular radioresistance, revealing a novel regulatory role.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • c-Abl tyrosine kinase is activated by DNA damage.
  • Its precise role in DNA double-strand break (DSB) repair remains unclear.
  • c-Abl interacts with DNA damage response and repair proteins.

Purpose of the Study:

  • To elucidate the functional significance of c-Abl in DSB repair.
  • To investigate the impact of c-Abl activity on DSB rejoining kinetics.
  • To determine if c-Abl modulates cellular radioresistance.

Main Methods:

  • Comet assay and pulsed-field gel electrophoresis to assess DSB repair.
  • Pharmacological inhibition and siRNA-mediated knockdown of c-Abl.
  • Analysis of H2AX phosphorylation and γH2AX foci.
  • Comparison of c-Abl null MEFs with reconstituted cells.

Main Results:

  • c-Abl inhibited the slow phase of DSB repair following ionizing radiation.
  • Pharmacological inhibition or depletion of c-Abl accelerated DSB rejoining.
  • c-Abl null cells showed enhanced DSB repair compared to c-Abl expressing cells.
  • Abrogation of c-Abl activity increased H2AX phosphorylation and γH2AX foci.
  • Transient inhibition of c-Abl conferred cellular radioresistance.

Conclusions:

  • c-Abl plays a novel inhibitory role in the slow phase of DSB repair.
  • Modulating c-Abl activity impacts DNA repair efficiency and radioresistance.
  • c-Abl is a key regulator of the cellular response to DNA double-strand breaks.

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