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Modified Terminal Restriction Fragment Analysis for Quantifying Telomere Length Using In-gel Hybridization
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A quantitative telomeric chromatin isolation protocol identifies different telomeric states.

Larissa Grolimund1, Eric Aeby, Romain Hamelin

  • 11] EPFL-Ecole Polytechnique Fédérale de Lausanne, School of Life Sciences, CH-1015 Lausanne, Switzerland [2] ISREC-Swiss Institute fro Experimental Cancer Research at EPFL, CH-1015 Lausanne, Switzerland [3].

Nature Communications
|November 26, 2013
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Summary

We developed a new method, quantitative telomeric chromatin isolation protocol (QTIP), to analyze telomere protein changes in human cells. QTIP helps understand telomere states in development and disease.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Telomere composition is poorly understood during aging, cancer, and telomere syndromes.
  • Accurate methods are needed to study dynamic changes in telomere-associated proteins.

Purpose of the Study:

  • To develop and validate a quantitative method for analyzing telomere protein composition in human cells.
  • To investigate changes in telomere protein composition associated with telomere length and function.

Main Methods:

  • Developed quantitative telomeric chromatin isolation protocol (QTIP) using cross-linking and mass spectrometry.
  • Employed stable isotope labeling by amino acids in cell culture (SILAC) for quantitative comparisons.
  • Enriched telomeric DNA and shelterin components for detailed analysis.

Main Results:

  • QTIP successfully identified known and novel telomere-associated proteins, including THO subunits, SMCHD1, and LRIF1.
  • Dysfunctional telomeres showed altered protein composition.
  • Long telomeres exhibited increased density of SMCHD1 and LRIF1, and enhanced association of shelterins (TRF1, TIN2, TPP1, POT1).

Conclusions:

  • QTIP is a validated method for studying telomere protein composition.
  • The method provides insights into telomere regulation during normal development and in disease states.
  • Identified novel proteins and differential protein associations with telomeres of varying lengths.