Cited by 291Telomeres, Telomerase, and SenescenceGenetics, Aging, and Longevity in Model OrganismsDNA and Nucleic Acid Chemistry

Telomere length homeostasis

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Hug, Nele, Lingner, Joachim·2006·Chromosoma

Abstract

The physical ends of chromosomes, known as telomeres, protect chromosome ends from nucleolytic degradation and DNA repair activities. Conventional DNA replication enzymes lack the ability to fully replicate telomere ends. In addition, nucleolytic activities contribute to telomere erosion. Short telomeres trigger DNA damage checkpoints, which mediate cellular senescence. Telomere length homeostasis requires telomerase, a cellular reverse transcriptase, which uses an internal RNA moiety as a template for the synthesis of telomere repeats. Telomerase elongates the 3' ends of chromosomes, whereas the complementary strand is filled in by conventional DNA polymerases. In humans, telomerase is ubiquitously expressed only during the first weeks of embryogenesis, and is subsequently downregulated in most cell types. Correct telomere length setting is crucial for long-term survival. The telomere length reserve must be sufficient to avoid premature cellular senescence and the acceleration of age-related disease. On the other side, telomere shortening suppresses tumor formation through limiting the replicative potential of cells. In recent years, novel insight into the regulation of telomerase at chromosome ends has increased our understanding on how telomere length homeostasis in telomerase-positive cells is achieved. Factors that recruit telomerase to telomeres in a cell cycle-dependent manner have been identified in Saccharomyces cerevisiae. In humans, telomerase assembles with telomeres during S phase of the cell cycle. Presumably through mediating formation of alternative telomere structures, telomere-binding proteins regulate telomerase activity in cis to favor preferential elongation of the shortest telomeres. Phosphoinositide 3-kinase related kinases are also required for telomerase activation at chromosome ends, at least in budding and fission yeast. In vivo analysis of telomere elongation kinetics shows that telomerase does not act on every telomere in each cell cycle but that it exhibits an increasing preference for telomeres as their lengths decline. This suggests a model in which telomeres switch between extendible and nonextendible states in a length-dependent manner. In this review we expand this model to incorporate the finding that telomerase levels also limit telomere length and we propose a second switch between a non-telomerase-associated "extendible" and a telomerase-associated "extending" state.

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Crossref · 10.1007/s00412-006-0067-3

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  • Two key regulators of telomerase activity are the actual structure of telomeres and the cell cycle-dependent creation of active telomerase; both restrict telomerase activity at chromosome ends during the S phase of each cell cycle.

    “Two different key regulators of TA are the actual structure of telomeres and the cell cycle-dependent creation of active telomerase. Both of them seem to restrict TA at chromosome ends during the S phase of each cell cycle [188].”
  • Throughout the cell cycle, telomeres fluctuate between different states (stationary/nonextendible, elongetable, and elongating).

    “Throughout the cell cycle, telomeres fluctuate between different states (stationary/nonextendible, elongetable, and elongating) [188].”

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Authors
Hug, N., & Lingner, J.
Affiliations
ISREC Foundation (CH)
Corresponding author
Lingner, Joachim
Venue
Chromosoma
Published
2006-06-02
Volume
115
Issue
6
Pages
413-425
ISSN
  • 0009-5915 (ISSN-L)
  • 1432-0886
OpenAlex
W2032694449
Cited by
291
References
125
Citations by year
2026: 2 · 2025: 1 · 2024: 7 · 2023: 8 · 2022: 7 · 2021: 16 · 2020: 5 · 2019: 9 · 2018: 13 · 2017: 23 · 2016: 17 · 2015: 17 · 2014: 16 · 2013: 19 · 2012: 23
FWCI
2.45
Type
journal article
Language
en
Open access
Locations
  • Chromosoma (publishedVersion)
  • PubMed (publishedVersion)
  • reroDoc Digital Library (submittedVersion)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
Keywords
telomere length homeostasis, telomerase, telomere shortening, DNA damage checkpoint, cellular senescence, telomere-binding proteins, S phase, age-related diseases, tumor suppression
MeSH terms
Animals, Cell Cycle, Homeostasis, Humans, Models, Biological, Saccharomyces cerevisiae, Telomere, Telomerase, Telomere-Binding Proteins

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