The ING1b tumor suppressor facilitates nucleotide excision repair by promoting chromatin accessibility to XPA

Journal Article · Tue May 01 00:00:00 EDT 2007 · Experimental Cell Research

DOI:https://doi.org/10.1016/j.yexcr.2007.02.010· OSTI ID:20972147

Kuo, Wei-Hung W ^[1]; Yemin, Wang ^[1]; Wong, Ronald P.C. ^[1]; Campos, Eric I ^[1]; Gang, Li ^[1]

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1. Department of Dermatology and Skin Science, Jack Bell Research Centre, Vancouver Coastal Health Research Institute, University of British Columbia, 2660 Oak Street, Vancouver, BC V6H 3Z6 (Canada)

ING1b is the most studied ING family protein and perhaps the most ubiquitously and abundantly expressed. This protein is involved in the regulation of various biological functions ranging from senescence, cell cycle arrest, apoptosis, to DNA repair. ING1b is upregulated by UV irradiation and enhances the removal of bulky nucleic acid photoproducts. In this study, we provide evidence that ING1b mediates nucleotide excision repair by facilitating the access to damaged nucleosomal DNA. We demonstrate that ING1b is not recruited to UV-induced DNA lesions but enhances nucleotide excision repair only in XPC-proficient cells, implying an essential role in early steps of the 'access, repair, restore' model. We also find that ING1b alters histone acetylation dynamics upon exposure to UV radiation and induces chromatin relaxation in microccocal nuclease digestion assay, revealing that ING1b may allow better access to nucleotide excision repair machinery. More importantly, ING1b associates with chromatin in a UV-inducible manner and facilitates DNA access to nucleotide excision repair factor XPA. Furthermore, depletion of the endogenous ING1b results to the sensitization of cells at S-phase to UV irradiation. Taken together, these observations establish a role of ING1b acting as a chromatin accessibility factor for DNA damage recognition proteins upon genotoxic injury.

• OSTI ID: 20972147
• Journal Information: Experimental Cell Research, Vol. 313, Issue 8; Other Information: DOI: 10.1016/j.yexcr.2007.02.010; PII: S0014-4827(07)00074-2; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0014-4827
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRONMENTAL POLLUTANT EFFECTS ON LIVING ORGANISMS AND BIOLOGICAL MATERIALS
ACETYLATION
APOPTOSIS
BIOLOGICAL FUNCTIONS
CELL CYCLE
CHROMATIN
DNA
DNA DAMAGES
EXCISION REPAIR
IRRADIATION
NEOPLASMS
NUCLEOTIDES
PROTEINS
ULTRAVIOLET RADIATION