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DNA damage-induced phosphorylation of the human telomere-associated protein TRF2

Hiromi Tanaka1, Marc S Mendonca, Paul S Bradshaw

  • 1Departments of Medical and Molecular Genetics, Radiation Oncology, and Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA.

Proceedings of the National Academy of Sciences of the United States of America
|October 15, 2005
PubMed

Insights

Human telomere protein TRF2 is phosphorylated upon DNA damage, moving to damage sites. This transient ATM kinase pathway response links DNA repair and telomere maintenance for genomic stability.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Genetics

Background:

  • Protein kinases are crucial for DNA repair and telomere maintenance across eukaryotes.
  • Telomere length and integrity are vital for genomic stability.
  • The human telomere-associated protein TRF2 plays a role in telomere maintenance.

Purpose of the Study:

  • To investigate the phosphorylation of human telomere-associated protein TRF2 in response to DNA damage.
  • To elucidate the signaling pathway responsible for TRF2 phosphorylation.
  • To understand the dynamic localization and transient nature of phosphorylated TRF2.

Main Methods:

  • Investigated TRF2 phosphorylation in response to DNA damage.
  • Assessed TRF2 localization to telomeres and DNA damage sites.
  • Utilized the ataxia-telangiectasia-mutated (ATM) protein kinase pathway analysis.

Main Results:

  • Human TRF2 is rapidly phosphorylated upon DNA damage.
  • Phosphorylated TRF2 dissociates from telomeres and localizes to damage sites.
  • The ATM signaling pathway mediates this DNA damage-induced phosphorylation.
  • Phosphorylated TRF2 levels are transient, dissipating within 2 hours post-irradiation.
  • Phosphorylated TRF2 is observed at telomeres during telomere crisis and ALT pathway activation.

Conclusions:

  • TRF2 phosphorylation is directly linked to the DNA damage response system.
  • This provides evidence of cross-talk between DNA repair and telomere maintenance pathways.
  • These interconnected processes are essential for maintaining genomic stability.

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