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Letter

Nature Genetics 36, 618–623 (1 June 2004) | doi:10.1038/ng1360

TIN2 is a tankyrase 1 PARP modulator in the TRF1 telomere length control complex

Jeffrey Zheng-Sheng Ye & Titia de Lange

Telomere length in humans is partly controlled by a feedback mechanism in which telomere elongation by telomerase is limited by the accumulation of the TRF1 complex at chromosome ends. TRF1 itself can be inhibited by the poly(ADP-ribose) polymerase (PARP) activity of its interacting partner tankyrase 1, which abolishes its DNA binding activity in vitro and removes the TRF1 complex from telomeres in vivo.