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Related Experiment Video

Updated: Oct 14, 2025

Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions
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The human telomeric proteome during telomere replication.

Chih-Yi Gabriela Lin1, Anna Christina Näger1, Thomas Lunardi1

  • 1Swiss Institute for Experimental Cancer Research (ISREC), School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.

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Summary

Telomere shortening, linked to aging and disease, is clarified by a new method identifying proteins crucial for replicating telomeric DNA. This research reveals dynamic proteome changes at telomere replication forks.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Telomere shortening contributes to aging and disease.
  • The end replication problem and DNA replication machinery challenges impact telomere length.
  • Understanding telomere replication is crucial for cellular health.

Purpose of the Study:

  • To comprehensively investigate telomere replication.
  • To identify proteins associated with telomere replication forks.
  • To reveal dynamic changes in the telomeric proteome during replication.

Main Methods:

  • Development of QTIP-iPOND (Quantitative Telomeric chromatin Isolation Protocol followed by isolation of Proteins On Nascent DNA).
  • Purification of proteins associating with telomeres during DNA replication.
  • Analysis of protein enrichment and depletion at telomere replication forks.

Main Results:

  • Identification of proteins, beyond the core replisome, that specifically associate with telomere replication forks.
  • Validation of protein importance for telomere replication through depletion studies causing telomere fragility.
  • Observation of POT1 depletion and histone H1 enrichment at telomere replication forks.

Conclusions:

  • QTIP-iPOND provides a valuable resource for studying telomere replication proteins.
  • The study reveals dynamic proteomic changes occurring specifically at telomere replication forks.
  • This work offers the first examination of the replisome at a specific genomic region.