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Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
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Do long telomeres affect cellular fitness?

Yaniv Harari1, Martin Kupiec2

  • 1Department of Molecular Microbiology and Biotechnology, Tel Aviv University, Ramat Aviv, 69978, Tel Aviv, Israel.

Current Genetics
|September 10, 2017
PubMed
Summary

Longer telomeres do not impact cellular lifespan or fitness in yeast. This study found no significant effects on cell division, meiosis, or survival under stress when telomeres were artificially lengthened.

Keywords:
AgingEthanolFitnessTelomeresYeast

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • Telomeres are crucial for genome stability and are implicated in aging and cancer.
  • Telomere length is tightly regulated in telomerase-expressing cells, despite inter-species variation.
  • Telomere shortening with age in humans suggests a potential role in the aging process.

Purpose of the Study:

  • To investigate the functional consequences of having longer telomeres.
  • To determine if extended telomere length impacts cellular lifespan, fitness, or key cellular processes.

Main Methods:

  • Utilized yeast strains with genetically and physiologically manipulated telomere lengths.
  • Assessed effects on vegetative cell division, meiosis, and overall cellular lifespan.
  • Evaluated fitness under various stressful conditions.

Main Results:

  • No discernible effect of longer telomeres on vegetative cell division was observed.
  • Meiosis and cellular lifespan remained unaffected by increased telomere length.
  • No positive or negative impact on yeast fitness was detected, even under stress.

Conclusions:

  • Extended telomere length in yeast does not confer benefits or detriments to cellular lifespan or fitness.
  • The strict control of telomere length may not be primarily driven by a need to optimize lifespan or fitness through elongation.