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Related Experiment Videos

Telomere length measurements using digital fluorescence microscopy.

S S Poon1, U M Martens, R K Ward

  • 1Terry Fox Laboratory for Hematology/Oncology, British Columbia Cancer Research Centre, Vancouver, British Columbia, Canada.

Cytometry
|July 15, 1999
PubMed
Summary
This summary is machine-generated.

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This study introduces a digital microscopy method using quantitative fluorescence in situ hybridization (Q-FISH) to measure telomere length. This technique accurately assesses telomere length in individual chromosomes from small cell samples.

Area of Science:

  • Genetics
  • Cell Biology
  • Microscopy

Background:

  • Telomeres, the ends of chromosomes, are crucial for genomic stability.
  • Telomere shortening is linked to cellular senescence and cancer.
  • Traditional telomere length measurement (Southern analysis) requires numerous cells and lacks individual chromosome data.

Purpose of the Study:

  • To develop a digital image microscopy system for measuring telomere length.
  • To enable telomere length assessment from limited cell samples.
  • To analyze telomere repeat sequences at individual chromosomes.

Main Methods:

  • Quantitative fluorescence in situ hybridization (Q-FISH) with Cy3-labeled PNA probes for telomere repeats.
  • DNA staining with DAPI and separate fluorescence image acquisition.

Related Experiment Videos

  • Image processing using dedicated TFL-TELO software to calculate integrated fluorescence intensity per telomere.

    • Main Results:

    • The method was validated using simulated and defined test objects.
    • Precision and consistency of human telomere length measurements were analyzed.
    • Averaging data from fewer than 30 cells provided reliable telomere length indication (10-15% SD).

    Conclusions:

    • Accurate and repeatable fluorescence intensity measurements from Q-FISH images are achievable.
    • The method provides telomere length information for individual chromosomes.
    • This technique is effective even with a limited number of cells.