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Probing the Telomere Damage Response.

Rekha Rai1, Sandy Chang2

  • 1Department of Laboratory Medicine, Yale University School of Medicine, 330 Cedar St., New Haven, CT, 06520, USA.

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

Telomere dysfunction triggers DNA damage responses, activating sensors like MRN and kinases ATM/ATR. This creates telomere dysfunction-induced foci (TIFs), allowing measurement of telomere damage and signaling.

Keywords:
DNA damageTelomere dysfunctionTelomere-FISHTelomere-induced foci

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Area of Science:

  • Cellular biology
  • Genetics
  • Molecular biology

Background:

  • Telomere attrition and shelterin loss trigger DNA damage responses.
  • Dysfunctional telomeres are recognized as DNA double-stranded breaks (DSBs).
  • This activates DNA damage repair (DDR) pathways and checkpoint sensors.

Purpose of the Study:

  • To investigate the signaling pathways activated by telomere dysfunction.
  • To identify biomarkers for quantifying telomere dysfunction.
  • To explore the formation of telomere dysfunction-induced foci (TIFs).

Main Methods:

  • Inducing telomere dysfunction via TRF2 deletion or TPP1 mutant expression.
  • Detecting DNA damage response signals.
  • Identifying foci formation (TIFs) through association with γ-H2AX and 53BP1.

Main Results:

  • Telomere dysfunction activates DDR pathways, including MRN complex, γ-H2AX, 53BP1, ATM, ATR, Chk1, Chk2, and p53.
  • Complete TRF2 deletion or dominant-negative TPP1 mutant induces robust DDR signals.
  • These signals manifest as TIFs at dysfunctional telomeres.

Conclusions:

  • TIFs serve as a quantifiable marker for telomere dysfunction.
  • Monitoring TIFs allows assessment of downstream signaling pathway activation.
  • This provides a method to study telomere maintenance and damage response mechanisms.