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Brd4 shields chromatin from ATM kinase signaling storms

Serah Choi1, Christopher J Bakkenist

  • 11UPMC Medical Education Transitional Year Residency Program, University of Pittsburgh School of Medicine, Hillman Cancer Center, Research Pavilion, Pittsburgh, PA 15213, USA.

Science Signaling
|September 19, 2013
PubMed

Insights

Ataxia telangiectasia mutated (ATM) kinase triggers rapid protein phosphorylation at DNA damage sites. New research clarifies how ATM signaling is initiated and controlled at chromatin.

Area of Science:

  • Molecular biology
  • Cellular signaling
  • DNA damage response

Background:

  • Ataxia telangiectasia mutated (ATM) kinase is a key sensor of DNA double-strand breaks.
  • Upon activation, ATM initiates a signaling cascade by phosphorylating numerous substrates.
  • The precise mechanisms controlling the initiation and termination of ATM signaling at chromatin remain incompletely understood.

Purpose of the Study:

  • To elucidate the mechanisms governing the initiation and limitation of ATM kinase signaling.
  • To advance the understanding of how ATM-mediated signaling storms are regulated at sites of DNA damage.

Main Methods:

  • The study integrates findings from recent publications by Kaidi and Jackson, and Floyd et al.
  • Analysis of molecular mechanisms controlling kinase activation and substrate targeting.
  • Investigating chromatin-based regulation of signaling pathways.

Main Results:

  • Recent studies have shed light on the initiation phase of ATM kinase signaling.
  • Mechanisms limiting the extent and duration of ATM signaling have been identified.
  • These findings highlight the complex regulation of ATM kinase activity at chromatin.

Conclusions:

  • Understanding ATM signaling regulation is crucial for comprehending DNA repair and cell fate.
  • Further research into ATM kinase regulation may reveal therapeutic targets for diseases involving genomic instability.

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