Telomeres are DNAprotein complexes at the ends of lineareukaryotic chromosomes. They consist of double-stranded, short,repeated sequences of nucleotides, a 3' single-strand overhangof nucleotides, and telomere-binding proteins. Telomeric DNAtypically consists of G-rich tandem repeats 5 to 8 bp long (inhumans, TTAGGG). In their location at the termini of chromosomes,telomeres maintain chromosomal stability and integrity and protectchromosomal ends against fusion, the degradation of terminalDNA by exonucleases, and recombination events.1 Telomeric DNAalso serves as a binding site for specific DNA-binding proteinsthat have critical functions in maintaining the function andstructural integrity of telomeres.
From the Department of Hematology, Leiden University Medical Center, Leiden, the Netherlands.
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