Cited by 299Telomeres, Telomerase, and SenescenceDNA Repair MechanismsDNA and Nucleic Acid Chemistry

The nature of telomere fusion and a definition of the critical telomere length in human cells

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Capper, Rebecca, Britt-Compton, Bethan, Tankimanova, Maira, Rowson, Jan, Letsolo, Boitelo, Man, Stephen, Haughton, Michele, Baird, Duncan M.·2007·Genes & Development

Abstract

The loss of telomere function can result in telomeric fusion events that lead to the types of genomic rearrangements, such as nonreciprocal translocations, that typify early-stage carcinogenesis. By using single-molecule approaches to characterize fusion events, we provide a functional definition of fusogenic telomeres in human cells. We show that approximately half of the fusion events contained no canonical telomere repeats at the fusion point; of those that did, the longest was 12.8 repeats. Furthermore, in addition to end-replication losses, human telomeres are subjected to large-scale deletion events that occur in the presence or absence of telomerase. Here we show that these telomeres are fusogenic, and thus despite the majority of telomeres being maintained at a stable length in normal human cells, a subset of stochastically shortened telomeres can potentially cause chromosomal instability. Telomere fusion was accompanied by the deletion of one or both telomeres extending several kilobases into the telomere-adjacent DNA, and microhomology was observed at the fusion points. This contrasted with telomere fusion that was observed following the experimental disruption of TRF2. The distinct error-prone mutational profile of fusion between critically shortened telomeres in human cells was reminiscent of Ku-independent microhomology-mediated end-joining.

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  • The segmental aneuploidies identified by cytogenetics analysis most probably point to the occurrence of complex genomic rearrangements in OCT4-targeted samples, such as chromosomal translocations or end-to-end fusions.

    “The segmental aneuploidies identified by cytogenetics analysis (Figs. 1B and S3-S5) most probably point to the occurrence of complex genomic rearrangements in OCT4-targeted samples, such as chromosomal translocations or end-to-end fusions, as it seems unlikely that the rest of the chromosome would continue to be retained without a telomere (31)(32)(33).”
  • Telomere fusions formed during telomere crisis in cultured cells are mediated by alt-NHEJ and show insertion of new sequences at the fusion point.

    “Telomere fusions formed during telomere crisis in cultured cells are mediated by alt-NHEJ and exhibit insertion of new sequences at the fusion point75,76.”
  • Evidence for past telomere crisis has been obtained in chronic lymphocytic leukaemia, breast cancer, colorectal adenomas, and other solid tumours using a PCR-based assay for telomere-telomere fusions.

    “Using this approach, evidence for past telomere crisis has been obtained in CLL as well as in breast cancer, colorectal adenomas and other solid tumours75,77,78.”
  • Critical telomere shortening (12.8 repeats) or loss of telomere-capping proteins results in telomere dysfunction with consequent chromosome fusion and genome instability.

    “Critical telomere shortening (12.8 repeats of repetitive clusters) either as a loss of telomere-capping proteins results to telomere dysfunction with consequent chromosomes fusion and genome instability [22].”

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Authors
Capper, R., Britt-Compton, B., Tankimanova, M., Rowson, J., Letsolo, B., Man, S., Haughton, M., & Baird, D. M.
Affiliations
Cardiff University (GB)
Corresponding author
Baird, Duncan M.
Venue
Genes & Development
Published
2007-10-01
Volume
21
Issue
19
Pages
2495-2508
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2159349156
Cited by
294
References
62
Citations by year
2026: 7 · 2025: 7 · 2024: 17 · 2023: 11 · 2022: 18 · 2021: 19 · 2020: 14 · 2019: 8 · 2018: 22 · 2017: 21 · 2016: 16 · 2015: 19 · 2014: 14 · 2013: 13 · 2012: 14
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • ORCA Online Research @Cardiff (Cardiff University) (acceptedVersion)
Funders
  • Cancer Research UK
  • Medical Research Council
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
Keywords
telomere fusion, telomere shortening, chromosomal instability, non-reciprocal translocation, microhomology-mediated end joining, TRF2, telomerase, carcinogenesis, single-molecule analysis
MeSH terms
Base Sequence, Humans, Molecular Sequence Data, Mutagenesis, Insertional, Telomere, Cellular Senescence, Sequence Deletion, Tandem Repeat Sequences, Telomeric Repeat Binding Protein 2, Chromosomal Instability, Cell Line, Tumor

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