The DOI matches its Crossref record; 18 of the 18 references it cites were found in a registry or an index.
Telomeric DNA in ALT Cells Is Characterized by Free Telomeric Circles and Heterogeneous t-Loops
Open accessAbstract
A prerequisite for cellular immortalization in human cells is the elongation of telomeres through the upregulation of telomerase or by the alternative lengthening of telomeres (ALT) pathway. In this study, telomere structure in multiple ALT cell lines was examined by electron microscopy. Nuclei were isolated from GM847, GM847-Tert, and WI-38 VA13 ALT cells, psoralen photo-cross-linked in situ, and the telomere restriction fragments were purified by gel filtration chromatography. Examination of telomere-enriched fractions revealed frequent extrachromosomal circles, ranging from 0.7 to 56.8 kb. t-loops were also observed, with the loop portion ranging from 0.5 to 70.2 kb. The total length of the loop plus tail of the t-loops corresponded to the telomere restriction fragment length from the ALT cell lines as determined by pulsed-field gel electrophoresis. The presence of extrachromosomal circles containing telomeric DNA was confirmed by two-dimensional pulsed-field gel electrophoresis. These results show that extrachromosomal telomeric DNA circles are present in ALT nuclei and suggest a roll-and-spread mechanism of telomere elongation similar to that seen in previous observations of multiple yeast species. Results presented here also indicate that expression of telomerase in GM847 cells does not affect t-loop or extrachromosomal circle formation.
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Cites
Specific Association of Human Telomerase Activity with Immortal Cells and Cancer
Kim, N. W., Piatyszek, M. A., Prowse, K. R., Harley, C. B., West, M. D., Ho, P. L. C., Coviello, G. M., Wright, W. E., Weinrich, S. L., & Shay, J. W. (1994) · Science · doi:10.1126/science.7605428 · Cited by 7,091 · cited 1×
“This occurs most commonly, in approximately 90 to 95% of human cancers and 60 to 70% of immortalized human cell lines, through the upregulation of telomerase ( 19 , 37).”
BackgroundTelomeres shorten during ageing of human fibroblasts
Harley, C. B., Futcher, A. B., & Greider, C. W. (1990) · Nature · doi:10.1038/345458a0 · Cited by 5,750
Extension of Life-Span by Introduction of Telomerase into Normal Human Cells
Bodnar, A. G., Ouellette, M., Frolkis, M., Holt, S. E., Chiu, C.-P., Morin, G. B., Harley, C. B., Shay, J. W., Lichtsteiner, S., & Wright, W. E. (1998) · Science · doi:10.1126/science.279.5349.349 · Cited by 4,975
A survey of telomerase activity in human cancer
Shay, J. W., & Bacchetti, S. (1997) · European Journal of Cancer · doi:10.1016/s0959-8049(97)00062-2 · Cited by 2,794
Mammalian Telomeres End in a Large Duplex Loop
Griffith, J. D., Comeau, L., Rosenfield, S., Stansel, R. M., Bianchi, A., Moss, H., & de Lange, T. (1999) · Cell · doi:10.1016/s0092-8674(00)80760-6 · Cited by 2,447
Self-citationCounter, C. M., Avilion, A. A., LeFeuvre, C. E., Stewart, N. G., Greider, C. W., Harley, C. B., & Bacchetti, S. (1992) · The EMBO Journal · doi:10.1002/j.1460-2075.1992.tb05245.x · Cited by 2,096 · cited 1×
“However, human cells can stave off induction of senescence or escape crisis by regenerating the telomeric DNA (4, 9, 17).”
BackgroundWATSON, J. D. (1972) · Nature New Biology · doi:10.1038/newbio239197a0 · Cited by 1,632
Herbig, U., Jobling, W. A., Chen, B. P. C., Chen, D. J., & Sedivy, J. M. (2004) · Molecular Cell · doi:10.1016/s1097-2765(04)00256-4 · Cited by 1,344
Bryan, T. M., Englezou, A., Dalla-Pozza, L., Dunham, M. A., & Reddel, R. R. (1997) · Nature Medicine · doi:10.1038/nm1197-1271 · Cited by 1,292
An alternative pathway for yeast telomere maintenance rescues est1− senescence
Lundblad, V., & Blackburn, E. H. (1993) · Cell · doi:10.1016/0092-8674(93)90234-h · Cited by 942
Cited by
Shelterin: the protein complex that shapes and safeguards human telomeres
de Lange, T. (2005) · Genes & Development · doi:10.1101/gad.1346005 · Cited by 3,056
How Shelterin Protects Mammalian Telomeres
Palm, W., & de Lange, T. (2008) · Annual Review of Genetics · doi:10.1146/annurev.genet.41.110306.130350 · Cited by 1,802
Lovejoy, C. A., Li, W., Reisenweber, S., Thongthip, S., Bruno, J., de Lange, T., De, S., Petrini, J. H. J., Sung, P. A., Jasin, M., et al. (2012) · PLoS Genetics · doi:10.1371/journal.pgen.1002772 · Cited by 629
“, contain extrachromosomal linear and circular telomeric DNA”
BackgroundDNA C-circles are specific and quantifiable markers of alternative-lengthening-of-telomeres activity
Henson, J. D., Cao, Y., Huschtscha, L. I., Chang, A. C., Au, A. Y. M., Pickett, H. A., & Reddel, R. R. (2009) · Nature Biotechnology · doi:10.1038/nbt.1587 · Cited by 498
Replication and protection of telomeres
Verdun, R. E., & Karlseder, J. (2007) · Nature · doi:10.1038/nature05976 · Cited by 463
Metadata
- Authors
- Cesare, A. J., & Griffith, J. D.
- Venue
- Molecular and Cellular Biology
- Publisher
- Informa UK Limited
- Published
- 2004-11
- Volume
- 24
- Issue
- 22
- Pages
- 9948-9957
- ISSN
- 0270-7306 (ISSN-L)
- 1098-5549
- OpenAlex
- W2107175910
- Cited by
- 343
- References
- 18
- FWCI
- 9.12
- Type
- journal article
- Language
- en
- Open access
- green
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