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In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
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Author Spotlight: Optimization of Performance Parameters of the TAGGG Telomere Length Assay
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Chemoptogenetic damage to mitochondria causes rapid telomere dysfunction.

Wei Qian1,2, Namrata Kumar2,3, Vera Roginskaya1,2

  • 1Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213.

Proceedings of the National Academy of Sciences of the United States of America
|August 28, 2019
PubMed
Summary

Mitochondrial dysfunction generates reactive oxygen species (ROS) that damage telomeres, activating DNA repair pathways. This reveals a critical link between mitochondria and telomere health in disease.

Keywords:
ATM signalingDNA damage responsemitochondriasinglet oxygentelomere

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Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Oxidative Stress

Background:

  • Reactive oxygen species (ROS) are implicated in aging, inflammation, and cancer.
  • Mitochondria are a primary source of cellular ROS, but the precise mechanisms of oxidative damage remain unclear.
  • Understanding mitochondrial ROS spatiotemporal dynamics is crucial for deciphering cellular damage.

Purpose of the Study:

  • To develop and validate a chemoptogenetic method for precise mitochondrial ROS induction and tracking.
  • To investigate the downstream effects of mitochondrially generated ROS on cellular components, particularly telomeres.
  • To elucidate the communication pathways between mitochondria and telomeres in response to oxidative stress.

Main Methods:

  • Developed a mitochondrially targeted fluorogen-activating peptide (Mito-FAP) for localized photosensitizer (MG-2I dye) delivery.
  • Utilized light-mediated activation to induce singlet oxygen production within mitochondria.
  • Employed ratiometric analysis to detect nuclear ROS and assessed telomere integrity and DNA damage markers.

Main Results:

  • Induced mitochondrial dysfunction, characterized by impaired respiration, reduced electron transport chain activity, and fragmentation.
  • Observed a sustained secondary wave of mitochondrial ROS (superoxide and hydrogen peroxide) for over 48 hours post-insult.
  • Identified nuclear hydrogen peroxide accumulation and specific telomere damage (fragility, loss, double-strand breaks) without widespread nuclear DNA damage or apoptosis.
  • Detected activation of ATM-mediated DNA damage response signaling specifically at telomeres.

Conclusions:

  • Mitochondrial dysfunction triggers localized telomere damage via ROS, independent of gross nuclear DNA damage.
  • Telomere defects activate ATM signaling, highlighting a critical communication axis between mitochondria and telomeres.
  • This study uncovers a novel mechanism of telomere-mitochondria crosstalk in the context of mitochondrial ROS, relevant to human diseases.