Cited by 716Telomeres, Telomerase, and SenescenceGenetics, Aging, and Longevity in Model OrganismsDNA and Nucleic Acid Chemistry

Roles of telomeres and telomerase in cancer, and advances in telomerase-targeted therapies

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Jafri, Mohammad A., Ansari, Shakeel A., Alqahtani, Mohammed H., Shay, Jerry W.·2016·Genome Medicine

Abstract

Telomeres maintain genomic integrity in normal cells, and their progressive shortening during successive cell divisions induces chromosomal instability. In the large majority of cancer cells, telomere length is maintained by telomerase. Thus, telomere length and telomerase activity are crucial for cancer initiation and the survival of tumors. Several pathways that regulate telomere length have been identified, and genome-scale studies have helped in mapping genes that are involved in telomere length control. Additionally, genomic screening for recurrent human telomerase gene hTERT promoter mutations and mutations in genes involved in the alternative lengthening of telomeres pathway, such as ATRX and DAXX, has elucidated how these genomic changes contribute to the activation of telomere maintenance mechanisms in cancer cells. Attempts have also been made to develop telomere length- and telomerase-based diagnostic tools and anticancer therapeutics. Recent efforts have revealed key aspects of telomerase assembly, intracellular trafficking and recruitment to telomeres for completing DNA synthesis, which may provide novel targets for the development of anticancer agents. Here, we summarize telomere organization and function and its role in oncogenesis. We also highlight genomic mutations that lead to reactivation of telomerase, and mechanisms of telomerase reconstitution and trafficking that shed light on its function in cancer initiation and tumor development. Additionally, recent advances in the clinical development of telomerase inhibitors, as well as potential novel targets, will be summarized.

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  • Neoplastic cells may also achieve genomic instability through short telomeres.

    “However, neoplastic cells may also achieve genomic instability through short telomeres.”
  • Neoplastic cells can bypass senescence and crisis through oncogenic modifications, eventually upregulating hTERT and increasing telomerase activity, leading to longer telomere length.

    “However, oncogenic changes help the cell to bypass senescence and continue divisions until multiple critically shortened telomeres initiate crisis (a period of complete replicative senescence, chromosome end-to-end fusions, and extensive apoptosis). If the neoplastic cell has acquired certain oncogenic modifications, it will overcome the crisis and continue to replicate. Eventually, in many cases,”

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Authors
Jafri, M. A., Ansari, S. A., Alqahtani, M. H., & Shay, J. W.
Affiliations
King Abdulaziz University (SA)
Corresponding author
Shay, Jerry W.
Venue
Genome Medicine
Published
2016-06-20
Volume
8
Issue
1
Pages
69-69
ISSN
1756-994X (ISSN-L)
OpenAlex
W2465907273
Cited by
716
References
110
Citations by year
2026: 29 · 2025: 66 · 2024: 84 · 2023: 105 · 2022: 96 · 2021: 88 · 2020: 96 · 2019: 67 · 2018: 42 · 2017: 37 · 2016: 4
FWCI
5.87
Type
journal article
Language
en
Open access
Locations
  • Genome Medicine (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Cancer Institute (P50CA70907)
  • National Institute on Aging (AG001228)
  • National Center for Research Resources (C06 RR3-414)
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
telomeres, telomerase, telomerase reactivation, telomere length control, alternative lengthening of telomeres, ATRX, DAXX, telomerase inhibitors, telomerase assembly, chromosomal instability, carcinogenesis, tumor initiation, anticancer agents
MeSH terms
X-linked Nuclear Protein, Antineoplastic Agents, DNA Helicases, Enzyme Inhibitors, Humans, Mutation, Neoplasms, Nuclear Proteins, Promoter Regions, Genetic, Telomere, Molecular Chaperones, Telomerase, Adaptor Proteins, Signal Transducing, Co-Repressor Proteins, Telomere Homeostasis

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