| Telomere associations in interphase nuclei: possible role in maintenance of interphase chromosome topology. | |
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MedLine Citation:
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PMID: 11148139 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The relative sizes of individual telomeres in cultured human cells under conditions of cell cycling, replicative quiescence, cell transformation and immortalization were determined using quantitative fluorescence in situ hybridization (Q-FISH) with a telomere-specific peptide nucleic acid (PNA) probe. Results obtained from analysis of telomere length profiles (TLPs), which display the distribution of relative telomere lengths for individual cells, confirmed telomere length heterogeneity at the single cell level and proportional shortening of telomere length during replicative aging of virus-transformed cells. TLPs also revealed that some telomeric ends of chromosomes are so closely juxtaposed within interphase nuclei that their fluorescent signals appear as a single spot. These telomeric associations (TAs) were far more prevalent in interphase nuclei of noncycling normal and virus-transformed cells than in their cycling counterparts. The number of interphase TAs per nucleus observed in late-passage E6/E7-transformed cells did not increase during progression to crisis, suggesting that telomere shortening does not increase the frequency of interphase TAs. Furthermore, interphase TAs were rarely observed in rapidly cycling, telomerase-positive, immortalized cells that exhibit somewhat shortened, but stabilized, telomere length through the activity of telomerase. Our overall results suggest that the number of interphase TAs is dependent more on whether or not cells are cycling than on telomere length, with TAs being most prominent in the nuclei of replicatively quiescent cells in which nonrandom (even preferred) chromosome spatial arrangements have been observed. We propose that interphase TAs may play a role in the generation and/or maintenance of nuclear architecture and chromosome positional stability in interphase nuclei, especially in cells with a prolonged G(1)/G(0) phase and possibly in terminally differentiated cells. |
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Authors:
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R G Nagele; A Q Velasco; W J Anderson; D J McMahon; Z Thomson; J Fazekas; K Wind; H Lee |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of cell science Volume: 114 ISSN: 0021-9533 ISO Abbreviation: J. Cell. Sci. Publication Date: 2001 Jan |
Date Detail:
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Created Date: 2001-01-26 Completed Date: 2001-05-17 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0052457 Medline TA: J Cell Sci Country: England |
Other Details:
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Languages: eng Pagination: 377-88 Citation Subset: IM |
Affiliation:
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Department of Molecular Biology, University of Medicine and Dentistry of New Jersey - School of Osteopathic Medicine, Stratford, New Jersey 08084, USA. nagelero@umdnj.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Cell Cycle
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physiology* Cell Division Cell Line Cell Line, Transformed Cell Nucleus / physiology*, ultrastructure Cell Transformation, Viral Chromosomes, Human / physiology, ultrastructure* Fibroblasts / cytology, physiology, ultrastructure Humans Image Processing, Computer-Assisted In Situ Hybridization, Fluorescence Interphase* Papillomaviridae / genetics Peptide Nucleic Acids Telomere / physiology*, ultrastructure |
| Chemical | |
Reg. No./Substance:
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0/Peptide Nucleic Acids |
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