Cited by 2,447Telomeres, Telomerase, and SenescenceDNA and Nucleic Acid ChemistryChromosomal and Genetic Variations

Mammalian Telomeres End in a Large Duplex Loop

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Griffith, Jack D, Comeau, Laurey, Rosenfield, Soraya, Stansel, Rachel M, Bianchi, Alessandro, Moss, Heidi, de Lange, Titia·1999·Cell

Abstract

Mammalian telomeres contain a duplex array of telomeric repeats bound to the telomeric repeat-binding factors TRF1 and TRF2. Inhibition of TRF2 results in immediate deprotection of chromosome ends, manifested by loss of the telomeric 3' overhang, activation of p53, and end-to-end chromosome fusions. Electron microscopy reported here demonstrated that TRF2 can remodel linear telomeric DNA into large duplex loops (t loops) in vitro. Electron microscopy analysis of psoralen cross-linked telomeric DNA purified from human and mouse cells revealed abundant large t loops with a size distribution consistent with their telomeric origin. Binding of TRF1 and single strand binding protein suggested that t loops are formed by invasion of the 3' telomeric overhang into the duplex telomeric repeat array. T loops may provide a general mechanism for the protection and replication of telomeres.

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Crossref · 10.1016/s0092-8674(00)80760-6

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  • Progressive loss of telomere repeats displaces shelterin components and destabilizes the t-loop, exposing the telomere end, which is recognized as a double-strand DNA break.

    “It has been hypothesized that with the progressive loss of telomere repeats with cell division due to the “end-replication problem”, shelterin components may be displaced from telomere regions and subsequently destabilize the abovementioned t-loop conformation (Griffith et al., 1999). This results in the exposure of the telomere end, which becomes recognized by the DNA repair machinery as a double”

    From Telomeres and cell senescence—size matters not (2017) · cites this paper as Griffith et al., 1999

  • The 3′ overhang binds to a double-stranded DNA region and facilitates t-loop formation.

    “The overhang is thought to bind to one of the double-stranded DNA regions and facilitate the formation of the t-loop structure (Griffith et al., 1999).”

    From Telomeres and cell senescence—size matters not (2017) · cites this paper as Griffith et al., 1999

  • Telomere shortening precipitates the loss of shelterin components and destabilization of the t-loop conformation, resulting in exposure of the telomere end.

    “It is thought that with each cell division, telomere shortening precipitates the loss of “shelterin” components and the destabilization of the t-loop conformation, resulting in exposure of the telomere end (Griffith et al., 1999).”

    From Stress, cell senescence and organismal ageing (2018) · cites this paper as Griffith et al., 1999

  • Telomeres are repetitive DNA sequences bound by the six-subunit shelterin complex that facilitates the formation of telomere loops to hide the telomere end, thus protecting chromosome ends from DNA break signaling pathways.

    “Telomeres are repetitive DNA sequences, bound by the six-subunit shelterin complex [86] that facilitates the formation of telomere loops (t-loop) to hide the telomere end [87,88], thus protecting the natural chromosome ends from signaling pathways that sense and act at DNA breaks.”

    From Mechanisms and Regulation of Cellular Senescence (2021) · cites this paper as [87]

  • The single-stranded overhang can fold back on the double-stranded telomere to form a t-loop that sequesters the chromosome end.

    “The single-stranded overhang can fold back on the double-stranded telomere in a lariat structure termed the t-loop, which serves to sequester the chromosome terminus (2).”

    From Telomeres and telomerase in cancer (2010) · cites this paper as [2]

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Authors
Griffith, J. D., Comeau, L., Rosenfield, S., Stansel, R. M., Bianchi, A., Moss, H., & de Lange, T.
Affiliations
  • University of North Carolina at Chapel Hill (US)
  • Rockefeller University (US)
Corresponding author
Griffith, Jack D
Venue
Cell
Publisher
Elsevier BV
Published
1999-05
Volume
97
Issue
4
Pages
503-514
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2032407757
Cited by
2,447
References
9
Citations by year
2026: 26 · 2025: 43 · 2024: 71 · 2023: 63 · 2022: 61 · 2021: 82 · 2020: 74 · 2019: 77 · 2018: 69 · 2017: 60 · 2016: 84 · 2015: 88 · 2014: 96 · 2013: 97 · 2012: 80
FWCI
62.64
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Sussex Research Online (University of Sussex) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
  • National Cancer Institute (CA19043)
  • National Institute of General Medical Sciences (GM 49046, GM-31819, R01GM031819)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Chromosomal and Genetic Variations
Keywords
telomeres, T-loop, TRF2, TRF1, telomeric overhangs, chromosome end protection, telomere replication, single-stranded DNA binding protein, chromosome fusion, p53 activation, DNA loop formation
MeSH terms
Animals, Cross-Linking Reagents, DNA, DNA-Binding Proteins, HeLa Cells, Humans, Mammals, Models, Molecular, Nucleic Acid Heteroduplexes, Recombinant Fusion Proteins, Telomere, Telomeric Repeat Binding Protein 1, Telomeric Repeat Binding Protein 2, Mice

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