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A truncated human chromosome 16 associated with α thalassaemia is stabilized by addition of telomeric repeat (TTAGGG)n

Nature volume 346, pages 868–871 (1990)Cite this article

Abstract

THE instability of chromosomes with breaks induced by X-irradi-ation led to the proposal that the natural ends of chromosomes are capped by a specialized structure, the telomere1. Telomeres prevent end-to-end fusions and exonucleolytic degradation, enable the end of the linear DNA molecule to replicate, and function in cell division (reviewed in ref. 2). Human telomeric DNA comprises ˜2–20 kilobases (kb) of the tandemly repeated sequence (TTAGGG)n oriented 5′→3′ towards the end of the chromosome3,4, interspersed with variant repeats in the proximal region5. Immediately subtelomeric lie families of unrelated repeat motifs (telomere-associated sequences) whose function, if any, is unknown6,7. In lower eukaryotes the formation and maintenance of telomeres may be mediated enzymatically (by telomerase)8 or by recombination9; in man the mechanisms are poorly understood, although telomerase has been identified in HeLa cells4. Here we describe an a thalassaemia10 mutation associated with terminal truncation of the short arm of chromosome 16 (within band 16pl3.3) to a site 50 kb distal to the α globin genes, and show that (TTAGGG)n has been added directly to the site of the break. The mutation is stably inherited, proving that telomeric DNA alone is sufficient to stabilize the broken chromosome end. This mechanism may occur in any genetic disease associated with chromosome truncation.

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Authors and Affiliations

  1. MRC Molecular Haematology Unit, Institute of Molecular Medicine, John Radcliffe Hospital, Headington, Oxford, 0X3 9DU, UK

    Andrew O. M. Wilkie, Janette Lamb, Peter C. Harris & Douglas R. Higgs

  2. Department of Haematology, North Tees General Hospital, Stockton-on-Tees, Cleveland, TS19 8PE, UK

    Roger D. Finney

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  1. Andrew O. M. Wilkie
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  2. Janette Lamb
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  3. Peter C. Harris
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  4. Roger D. Finney
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  5. Douglas R. Higgs
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Wilkie, A., Lamb, J., Harris, P. et al. A truncated human chromosome 16 associated with α thalassaemia is stabilized by addition of telomeric repeat (TTAGGG)n. Nature 346, 868–871 (1990). https://doi.org/10.1038/346868a0

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