Cited by 1,802Telomeres, Telomerase, and SenescenceDNA Repair MechanismsDNA and Nucleic Acid Chemistry

How Shelterin Protects Mammalian Telomeres

Palm, Wilhelm, de Lange, Titia·2008·Annual Review of Genetics

Abstract

The genomes of prokaryotes and eukaryotic organelles are usually circular as are most plasmids and viral genomes. In contrast, the nuclear genomes of eukaryotes are organized on linear chromosomes, which require mechanisms to protect and replicate DNA ends. Eukaryotes navigate these problemswith the advent of telomeres, protective nucleoprotein complexes at the ends of linear chromosomes, and telomerase, the enzyme that maintains the DNA in these structures. Mammalian telomeres contain a specific protein complex, shelterin, that functions to protect chromosome ends from all aspects of the DNA damage response and regulates telomere maintenance by telomerase. Recent experiments, discussed here, have revealed how shelterin represses the ATM and ATR kinase signaling pathways and hides chromosome ends from nonhomologous end joining and homology-directed repair.

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Crossref · 10.1146/annurev.genet.41.110306.130350

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28 of 28 references verified0 citation errors · 0 not checkable

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  • Homeostasis of the telomeric ends can be regulated by protein parts of the shelterin complex.

    “It has been shown that homeostasis of the telomeric ends can be regulated by protein parts of the shelterin complex [186,187].”
  • Telomeres are DNA repeats that protect chromosome ends from recombination, fusion, and degradation that would cause genomic instability.

    “Telomeres are DNA repeats that protect chromosome ends from illicit recombination, fusion, and degradation leading to genomic instability (Palm and de Lange, 2008).”
  • Vertebrate telomeres contain TTAGGG repeats, a long double-stranded region, and a single-stranded 3' overhang of a few hundred nucleotides.

    “In vertebrates, telomeres are composed of the sequence TTAGGG and include a double-stranded tract of repeats many kilobases long and an obligate single-stranded 3# overhang, measuring a few hundred nucleotides (1).”

    From Telomeres and telomerase in cancer (2010) · cites this paper as [1]

  • Telomeres consist of double-stranded TTAGGG repeats that end in a single-stranded overhang.

    “Telomeres are TTAGGG double-stranded DNA repeats culminating in a single-stranded overhang.”

    From Telomeres and telomerase in cancer (2010) · cites this paper as Palm,W. et al. (2008)

  • Shelterin regulates telomerase's access to telomeres.

    “The shelterin protein complex protects telomeres, facilitates replication and controls access of telomerase.”

    From Telomeres and telomerase in cancer (2010) · cites this paper as Palm,W. et al. (2008)

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Authors
Palm, W., & de Lange, T.
Affiliations
  • Max Planck Institute of Molecular Cell Biology and Genetics (DE)
  • Laboratory for Cell Biology and Genetics, The Rockefeller University, New York, NY 10021;
Venue
Annual Review of Genetics
Published
2008-12-01
Volume
42
Issue
1
Pages
301-334
ISSN
  • 0066-4197 (ISSN-L)
  • 1545-2948
OpenAlex
W2150490516
Cited by
1,802
References
28
Citations by year
2026: 34 · 2025: 44 · 2024: 61 · 2023: 55 · 2022: 79 · 2021: 104 · 2020: 84 · 2019: 117 · 2018: 120 · 2017: 120 · 2016: 127 · 2015: 141 · 2014: 129 · 2013: 132 · 2012: 124
FWCI
11.31
Type
journal article
Language
en
Open access
closed
Locations
  • Annual Review of Genetics (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Aging (AG016642)
  • National Cancer Institute (CA076027, R01CA076027)
  • National Institute of General Medical Sciences (GM049046)
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
shelterin, telomeres, telomerase, chromosome end protection, ATM signaling, ATR signaling, DNA damage response, non-homologous end joining, homology-directed repair, telomere maintenance
MeSH terms
Shelterin Complex, Animals, Base Sequence, DNA, DNA Damage, DNA Repair, Eukaryotic Cells, Humans, Models, Biological, Models, Molecular, Repressor Proteins, Signal Transduction, Telomere, Telomere-Binding Proteins, Multiprotein Complexes

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