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- Title
Senescence induced by altered telomere state, not telomere loss.
- Authors
Karlseder, Jan; Smogorzewska, Agata; de Lange, Titia
- Abstract
Primary human cells in culture invariably stop dividing and enter a state of growth arrest called replicative senescence. This transition is induced by programmed telomere shortening, but the underlying mechanisms are unclear. Here, we report that overexpression of TRF2, a telomeric DNA binding protein, increased the rate of telomere shortening in primary cells without accelerating senescence. TRF2 reduced the senescence setpoint, defined as telomere length at senescence, from 7 to 4 kilobases. TRF2 protected critically short telomeres from fusion and repressed chromosome-end fusions in presenescent cultures, which explains the ability of TRF2 to delay senescence. Thus, replicative senescence is induced by a change in the protected status of shortened telomeres rather than by a complete loss of telomeric DNA.
- Publication
Science (New York, N.Y.), 2002, Vol 295, Issue 5564, p2446
- ISSN
1095-9203
- Publication type
Journal Article
- DOI
10.1126/science.1069523