Small-molecule-induced DNA damage identifies alternative DNA structures in human genes.

Small-molecule-induced DNA damage identifies alternative DNA structures in human genes.
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DOI:
10.1038/nchembio.780
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发表时间:
2012-02-05
影响因子:
14.8
通讯作者:
Jackson, Stephen P.
Jackson, Stephen P.
中科院分区:
生物学1区
文献类型:
--
作者:
Rodriguez, Raphael;Miller, Kyle M.;Forment, Josep V.;Bradshaw, Charles R.;Nikan, Mehran;Britton, Sebastien;Oelschlaegel, Tobias;Xhemalce, Blerta;Balasubramanian, Shankar;Jackson, Stephen P.

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Guanine-rich DNA sequences that can adopt non-Watson-Crick structures in vitro are prevalent in the human genome. Whether such structures normally exist in mammalian cells has, however, been the subject of active research for decades. Here, we show that the G-quadruplex interacting drug pyridostatin promoted growth arrest in human cancer cells via inducing replication- and transcription-dependent DNA damage. Chromatin immunoprecipitation sequence (ChIP-Seq) analysis of the DNA damage marker γH2AX provided the genome-wide distribution of pyridostatin-induced sites of damage, and revealed that pyridostatin targets gene bodies containing clusters of sequences with a propensity for G-quadruplex formation. As a result, pyridostatin modulated the expression of these genes, including the proto-oncogene SRC. We observed that pyridostatin reduced SRC protein levels and SRC-dependent cellular motility in human breast cancer cells, validating SRC as a target. Our unbiased approach to define genomic sites of action for a drug establishes a framework for discovering functional DNA-drug interactions.
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