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Related Experiment Videos

Effectors of mammalian telomere dysfunction: a comparative transcriptome analysis using mouse models.

Sonia Franco1, Andrés Canela, Peter Klatt

  • 1Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Center (CNIO), Melchor Fernández Almagro 3, 28029 Madrid, Spain.

Carcinogenesis
|April 30, 2005
PubMed
Summary

Telomere dysfunction in mouse germ cells triggers a broad transcriptional response, primarily involving cell communication and survival pathways. This response is strongest in double mutants, indicating a compensatory mechanism for impaired germ cell function.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Aging Research

Background:

  • Critical telomere shortening (Terc-/- mice) or loss of telomere capping (Ku86-/- mice) leads to premature aging.
  • Telomere dysfunction impacts organismal health and cellular function.

Purpose of the Study:

  • To investigate genome-wide transcription in mouse germ cells with telomere dysfunction.
  • To compare transcriptional responses in single (Terc-/-, Ku86-/-) and double (Terc-/-/Ku86-/-) mutants.

Main Methods:

  • High-density oligonucleotide microarrays were used for genome-wide transcription analysis.
  • Analysis focused on G3 Terc-/-, Ku86-/-, and G3 Terc-/-/Ku86-/- mouse germ cells.

Main Results:

  • Transcriptional responses were mainly inductive and similar across genotypes, with highest induction in double mutants.

Related Experiment Videos

  • Upregulated genes in double mutants are involved in cell adhesion, communication, metabolism, and antioxidant responses.
  • Telomere dysfunction induces compensatory survival signals via the PI3-kinase pathway and genes essential for spermatogenesis.

    • Conclusions:

    • Telomere dysfunction elicits a robust compensatory transcriptional response in germ cells.
    • This response aims to rescue impaired germ cell function through survival and spermatogenesis-related pathways.