Cited by 797Telomeres, Telomerase, and SenescenceGenetics, Aging, and Longevity in Model OrganismsDNA and Nucleic Acid Chemistry

Senescence Induced by Altered Telomere State, Not Telomere Loss

Karlseder, Jan, Smogorzewska, Agata, de Lange, Titia·2002·Science

Abstract

Primary human cells in culture invariably stop dividing and enter a state of growth arrest called replicative senescence. This transition is induced by programmed telomere shortening, but the underlying mechanisms are unclear. Here, we report that overexpression of TRF2, a telomeric DNA binding protein, increased the rate of telomere shortening in primary cells without accelerating senescence. TRF2 reduced the senescence setpoint, defined as telomere length at senescence, from 7 to 4 kilobases. TRF2 protected critically short telomeres from fusion and repressed chromosome-end fusions in presenescent cultures, which explains the ability of TRF2 to delay senescence. Thus, replicative senescence is induced by a change in the protected status of shortened telomeres rather than by a complete loss of telomeric DNA.

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Crossref · 10.1126/science.1069523

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  • TRF2-dependent suppression of DNA repair within telomeres can yield DDR signaling from telomere-associated damage resulting from causes other than telomere shortening.

    “In addition, the TRF2-dependent suppression of DNA repair within telomeres can yield DDR signaling from telomere-associated damage resulting from causes other than telomere shortening (Karlseder et al. 2002; Fumagalli et al. 2012).”

    From Cellular senescence and its effector programs (2014) · cites this paper as Karlseder et al. 2002

  • Overexpression of TRF2 can delay senescence, indicating that the DDR in senescence results from insufficient shelterin loading at shortened telomeres.

    “Furthermore, over-expression of the shelterin subunit telomeric repeat-binding factor 2 (TRF2; also known as TERF2) can delay the onset of senescence44, arguing that the DDR in senescence is due to an insufficient loading of shelterin at the shortened telomeres.”
  • TRF2 overexpression delays replicative senescence onset, indicating that TRF2 capacity to sequester the telomere terminus via the t-loop conformation might suppress the DNA damage signal from too short telomere ends and protect them from ATM signaling.

    “In agreement, TRF2 overexpression delays replicative senescence onset [101], indicating that TRF2 capacity to sequester the telomere terminus via the t-loop conformation [88] might suppress the DNA damage signal from too short telomere ends and protect them from ATM signaling.”

    From Mechanisms and Regulation of Cellular Senescence (2021) · cites this paper as [101]

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Authors
Karlseder, J., Smogorzewska, A., & de Lange, T.
Affiliations
  • Rockefeller University (US)
  • Laboratory for Cell Biology and Genetics, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
Venue
Science
Published
2002-03-29
Volume
295
Issue
5564
Pages
2446-2449
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2088926897
Cited by
796
References
25
Citations by year
2026: 10 · 2025: 11 · 2024: 22 · 2023: 11 · 2022: 14 · 2021: 22 · 2020: 18 · 2019: 19 · 2018: 26 · 2017: 22 · 2016: 20 · 2015: 29 · 2014: 24 · 2013: 22 · 2012: 35
FWCI
47.76
Type
journal article
Language
en
Open access
closed
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Aging (AG 16643)
  • National Cancer Institute (R01CA076027, CA76027)
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
replicative senescence, telomere shortening, TRF2, telomere length, telomere fusion, primary human cells, growth arrest
MeSH terms
Antigens, Polyomavirus Transforming, Cell Division, Cell Line, Cells, Cultured, DNA, DNA-Binding Proteins, Humans, Oncogene Proteins, Viral, Repressor Proteins, Retroviridae, Transformation, Genetic, Tumor Suppressor Protein p53, Retinoblastoma Protein, Telomere, Cellular Senescence, Telomeric Repeat Binding Protein 2, Papillomavirus E7 Proteins

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