DNA sequences of telomeres maintained in yeast (original) (raw)
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- Published: 12 July 1984
Nature volume 310, pages 154–157 (1984)Cite this article
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Abstract
Telomeres, the ends of eukaryotic chromosomes, have long been recognized as specialized structures. Their stability compared with broken ends of chromosomes1,2 suggested that they have properties which protect them from fusion, degradation or recombination1,3,4. Furthermore, a linear DNA molecule such as that of a eukaryotic chromosome must have a structure at its ends which allows its complete replication5–8, as no known DNA polymerase can initiate synthesis without a primer. At the ends of the relatively short, multi-copy linear DNA molecules found naturally in the nuclei of several lower eukaryotes, there are simple tandemly repeated sequences9–17 with, in the cases analysed, a specific array of single-strand breaks, on both DNA strands, in the distal portion of the block of repeats9,10,17. In general, however, direct analysis of chromosomal termini presents problems because of their very low abundance in nuclei. To circumvent this problem, we have previously cloned a chromosomal telomere of the yeast Saccharomyces cerevisiae on a linear DNA vector molecule18. Here we show that yeast chromosomal telomeres terminate in a DNA sequence consisting of tandem irregular repeats of the general form C1–3A. The same repeat units are added to the ends of Tetrahymena telomeres, in an apparently non-template-directed manner, during their replication on linear plasmids in yeast. Such DNA addition may have a fundamental role in telomere replication.
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Authors and Affiliations
- Department of Molecular Biology, University of California, Berkeley, California, 94720, USA
Janis Shampay & Elizabeth H. Blackburn - Dana-Farber Cancer Institute, and Department of Biological Chemistry, Harvard Medical School, Boston, Massachusetts, 02115, USA
Jack W. Szostak
Authors
- Janis Shampay
You can also search for this author inPubMed Google Scholar - Jack W. Szostak
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Shampay, J., Szostak, J. & Blackburn, E. DNA sequences of telomeres maintained in yeast.Nature 310, 154–157 (1984). https://doi.org/10.1038/310154a0
- Received: 23 January 1984
- Accepted: 10 May 1984
- Issue Date: 12 July 1984
- DOI: https://doi.org/10.1038/310154a0