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Telomere shortening associated with chromosome instability is arrested in immortal cells which express telomerase activity.
Open accessAbstract
Loss of telomeric DNA during cell proliferation may play a role in ageing and cancer. Since telomeres permit complete replication of eukaryotic chromosomes and protect their ends from recombination, we have measured telomere length, telomerase activity and chromosome rearrangements in human cells before and after transformation with SV40 or Ad5. In all mortal populations, telomeres shortened by approximately 65 bp/generation during the lifespan of the cultures. When transformed cells reached crisis, the length of the telomeric TTAGGG repeats was only approximately 1.5 kbp and many dicentric chromosomes were observed. In immortal cells, telomere length and frequency of dicentric chromosomes stabilized after crisis. Telomerase activity was not detectable in control or extended lifespan populations but was present in immortal populations. These results suggest that chromosomes with short (TTAGGG)n tracts are recombinogenic, critically shortened telomeres may be incompatible with cell proliferation and stabilization of telomere length by telomerase may be required for immortalization.
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“In primary cells deficient for Rb and p53, continued cellular growth beyond the Hayflick limit results in severe telomere shortening, marked genetic instability, and massive cell death—a period referred to as crisis (Counter et al. 1992”
From p53 Deficiency Rescues the Adverse Effects of Telomere Loss and Cooperates with Telomere Dysfunction to Accelerate Carcinogenesis (1999) · cites this paper as Counter et al. 1992
In the citing paper
“However, as these human fibroblasts undergo additional cell divisions, telomere erosion continues and the loss of telomere capping function produces rampant chromosomal instability and widespread apoptosis, a cellular state termed crisis (27).”
From Telomeres and telomerase in cancer (2010) · cites this paper as [27]
In the citing paper
“Crisis serves as the second checkpoint in tumor suppression and is characterized by multiple chromosomal fusions36.”
From Telomere dysfunction and tumour suppression: the senescence connection (2008) · cites this paper as [36]
In the citing paper
“Telomere maintenance is essential to the replicative potential of malignant cells and the inhibition of telomerase can lead to telomere shortening and cessation of unrestrained proliferation.”
From A highly selective telomerase inhibitor limiting human cancer cell proliferation (2001) · cites this paper as Counter et al., 1992
In the citing paper
“Eventually, telomeres shorten to a critical length and lose their ability to protect the ends of chromosomal DNA (Counter et al., 1992;Blasco et al., 1997).”
From A highly selective telomerase inhibitor limiting human cancer cell proliferation (2001) · cites this paper as Counter et al., 1992
In the citing paper
“Telomere maintenance is essential to the replicative potential of malignant cells and the inhibition of telomerase can lead to telomere shortening and cessation of unrestrained proliferation.”
From A highly selective telomerase inhibitor limiting human cancer cell proliferation (2001) · cites this paper as Counter et al., 1992
In the citing paper
“In cancer cells, the reactivation of telomerase is thought to stabilize telomere length, thereby compensating for the cell division-related telomere erosion and providing unlimited proliferative capacity to malignant cells (Counter et al., 1992;Kim et al., 1994).”
From A highly selective telomerase inhibitor limiting human cancer cell proliferation (2001) · cites this paper as Counter et al., 1992
In the citing paper
“In most normal human cells, telomerase activity is low or not detectable, and telomeric DNA is progressively lost at a rate of 30±120 bp with each replication cycle (Harley et al., 1990;Hastie et al., 1990;Counter et al., 1992).”
From A highly selective telomerase inhibitor limiting human cancer cell proliferation (2001) · cites this paper as Counter et al., 1992
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“Upon critical shortening of telomeric DNA, human somatic cells enter a nonreplicative but viable state known as senescence (Allsopp et al., 1992; Counter et al., 1992).”
BackgroundTelomeric sequences, radiation sensitivity and genomic instability
Bouffler, S. D., Blasco, M. A., Cox, R., & Smith, P. J. (2001) · International Journal of Radiation Biology · doi:10.1080/09553000110069326 · Cited by 43
“A number ofWhen in crisis, human cells expressing SV40 T-antigen are characterized by a high frequency of studies in mice and Chinese hamsters have indicated that these interstitial telomeric locations may bedicentric chromosomes and telomeric associations (Counter et al. 1992) .”
BackgroundDoes telomere shortening drive selection for p53 mutation in human cancer?
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Mouse Models for the Study of Telomerase
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Energetics of Quadruplex-Drug Recognition in Anticancer Therapy
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Telomere biology and translational research
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“When the cells are expressing telomerase this shortening does not take place (16).”
BackgroundEndothelial Progenitor Cell Function, Apoptosis, and Telomere Length in Overweight/Obese Humans
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“In most human cells, telomeres become shorter by about 30–100 bp after each cell division (38).”
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“Induction of telomerase is a critical step for cell immortalization, transformation, and human cancer development (13).”
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“However, in cells that are unable to senesce, telomeres continue to shorten, eventually resulting in extensive chromosome fusion [22].”
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Telomeres, Telomerase, and Telomerase Inhibition: Clinical Implications for Cancer
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“In contrast to that in most normal human cells the hTERT expression and telomerase activity are low or repressed (Counter et al. 1992; Harley et al. 1990).”
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Metadata
- Authors
- Counter, C. M., Avilion, A. A., LeFeuvre, C. E., Stewart, N. G., Greider, C. W., Harley, C. B., & Bacchetti, S.
- Affiliations
- McMaster University (CA)
- Venue
- The EMBO Journal
- Published
- 1992-05-01
- Volume
- 11
- Issue
- 5
- Pages
- 1921-1929
- ISSN
- 0261-4189 (ISSN-L)
- 1460-2075
- PMC
- PMC556651
- OpenAlex
- W1543500873
- Cited by
- 2,096
- References
- 53
- Citations by year
- 2026: 10 · 2025: 21 · 2024: 25 · 2023: 25 · 2022: 27 · 2021: 35 · 2020: 29 · 2019: 28 · 2018: 39 · 2017: 42 · 2016: 48 · 2015: 53 · 2014: 51 · 2013: 65 · 2012: 55
- FWCI
- 23.80
- Type
- journal article
- Language
- en
- Open access
- green
- europepmc.org
- Locations
- The EMBO Journal (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Cold Spring Harbor Laboratory Institutional Repository (Cold Spring Harbor Laboratory) (acceptedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › 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 › Genetics › Chromosomal and Genetic Variations
- Keywords
- telomere shortening, telomerase, chromosomal instability, cell immortalization, telomere length, dicentric chromosomes, telomeric DNA, SV40 transformation, adenovirus type 5, cell transformation, telomere recombination, cell proliferation, aging, cancer
- MeSH terms
- Cell Transformation, Neoplastic, Cell Transformation, Viral, Chromosomes, Human, DNA, DNA Nucleotidylexotransferase, Humans, Karyotyping, Kidney, Transfection, Telomere, Cellular Senescence
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