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Department of Medical Genetics, University of British Columbia, Vancouver, Canada.
Eukaryotic telomeres are specialized DNA-protein structures that are thought to ensure chromosomal stability and complete replication of the chromosome ends. All telomeres which have been studied consist of a tandem array of G-rich repeats which seem to be sufficient for telomere function. Originally, the human telomeric repeat (TTAGGG)n was assumed to be exclusively located at the very end of all human chromosomes. More recent evidence, however, suggests an extension into proterminal regions. Very little is known about the interstitial distribution of telomeric repeats. Here we present evidence for the presence of (TTAGGG)n repeats in internal loci on the long and short arms of different human chromosomes. In addition, we studied the genomic organization of these repeats in more detail and discuss possible functions of interstitial telomeric repeats in the human genome.
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