Inhibitor of growth 1 (ING1) acts at early steps of multiple DNA repair pathways

ING proteins are tumor suppressors involved in the regulation of gene transcription, cell cycle arrest, apoptosis, and senescence. Here, we show that ING1b expression is upregulated by several DNA-damaging agents, in a p53-independent manner. ING1b stimulates DNA repair of a variety of DNA lesions requiring activation of multiple DNA repair pathways. Moreover, Ing1−/− cells showed impaired genomic DNA repair after H2O2 and neocarzinostatin treatment and this defect was reverted by overexpression of ING1b. Two tumor-derived ING1 mutants failed to promote DNA repair highlighting the physiological importance of the integrity of the PHD domain for ING1b DNA repair activity and suggesting a role in the prevention of tumor progression. Ing−/− cells showed higher basal levels of γ-H2AX and, upon DNA damage, γ-H2AX increase was greater and with faster kinetics compared to wild-type cells. Chromatin relaxation by Trichostatin A led to an exacerbated damage signal in both types of cells, but this effect was dependent on Ing1 status, and more pronounced in wild-type cells. Our results suggest that ING1 acts at early stages of the DNA damage response activating a variety of repair mechanisms and that this function of ING1 is targeted in tumors.

• Publication year

  2013

• Venue

  Molecular and Cellular Biochemistry

• Publication date

  2013-03-04

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1007/s11010-013-1601-2PMID 23459830
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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