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Related Experiment Videos

Telomere length assessment in tissue sections by quantitative FISH: image analysis algorithms.

Jacintha N O'Sullivan1, Jennifer C Finley, Rosa-ana Risques

  • 1Department of Pathology, University of Washington, Seattle, Washington 98195-7705, USA.

Cytometry. Part a : the Journal of the International Society for Analytical Cytology
|April 2, 2004
PubMed
Summary

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Quantitative fluorescence in situ hybridization (QFISH) enables accurate telomere length measurement in tissue sections. Simpler QFISH analysis methods are reliable for studying telomere dynamics in aging and disease.

Area of Science:

  • Genetics
  • Cell Biology
  • Biotechnology

Background:

  • Telomeres are protective DNA sequences at chromosome ends, crucial for cellular stability and proliferation.
  • Telomere length regulation is vital in cellular senescence and neoplastic processes.
  • Accurate telomere length assessment is essential for understanding its role in biological processes.

Purpose of the Study:

  • To apply and compare quantitative fluorescence in situ hybridization (QFISH) for measuring average telomere lengths in cultured cells and human GI tract tissues.
  • To evaluate three image analysis algorithms for QFISH data interpretation.
  • To validate QFISH methods against conventional telomere length measurement techniques.

Main Methods:

  • Quantitative fluorescence in situ hybridization (QFISH) was used on cultured cells and human GI tract tissue sections.

Related Experiment Videos

  • Three image analysis algorithms were compared: pixel histogram, spot-finding, and background curve subtraction.
  • Peptide nucleic acid (PNA) and phosphoamidate (PA) oligonucleotide probes were utilized.

    • Main Results:

    • QFISH demonstrated telomere shortening with increasing population doubling levels in normal human diploid fibroblasts.
    • In situ QFISH results agreed well with the standard telomere repeat fragment-Southern blot method.
    • Telomere length reductions were observed in tissue sections from chronic ulcerative colitis, colon adenomas, and Barrett's esophagus, with the spot-finding method showing higher variability.

    Conclusions:

    • QFISH combined with confocal microscopy allows for accurate and reproducible telomere length measurements in tissue sections.
    • Simpler QFISH analysis algorithms are reliable and accessible, facilitating telomere length studies.
    • These methods enhance the analysis of telomere length in tissue samples, aiding research into aging and disease.