Abstract
DNA damage is known to trigger key cellular defense pathways such as those involved in DNA repair. Here we provide evidence for a previously unrecognized pathway regulating transcription in response to DNA damage and show that this regulation is mediated by the abundant nuclear enzyme poly(ADP-ribose) polymerase. We found that poly(ADP-ribose) polymerase reduced the rate of transcription elongation by RNA polymerase II, suggesting that poly(ADP-ribose) polymerase negatively regulates transcription, possibly through the formation of poly(ADP-ribose) polymerase–RNA complexes. In damaged cells, poly(ADP-ribose) polymerase binds to DNA breaks and automodifies itself in the presence of NAD + , resulting in poly(ADP-ribose) polymerase inactivation. We found that automodification of poly(ADP-ribose) polymerase in response to DNA damage resulted in the up-regulation of transcription, presumably because automodified poly(ADP-ribose) polymerase molecules were released from transcripts, thereby relieving the block on transcription. Because agents that damage DNA damage RNA as well, up-regulation of RNA synthesis in response to DNA damage may provide cells with a mechanism to compensate for the loss of damaged transcripts and may be critical for cell survival after exposure to DNA-damaging agents.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 6:31 a.m.) |
Deposited | 3 years, 4 months ago (April 12, 2022, 10:07 p.m.) |
Indexed | 2 months, 3 weeks ago (June 10, 2025, 3:04 p.m.) |
Issued | 25 years ago (Aug. 15, 2000) |
Published | 25 years ago (Aug. 15, 2000) |
Published Online | 25 years ago (Aug. 15, 2000) |
Published Print | 25 years ago (Aug. 29, 2000) |
@article{Visp__2000, title={A cellular defense pathway regulating transcription through poly(ADP-ribosyl)ation in response to DNA damage}, volume={97}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.170280397}, DOI={10.1073/pnas.170280397}, number={18}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Vispé, Stéphane and Yung, Tetsu M. C. and Ritchot, Janelle and Serizawa, Hiroaki and Satoh, Masahiko S.}, year={2000}, month=aug, pages={9886–9891} }