Chromatin dynamics and the repair of DNA double strand breaks

Ye Xu, Brendan D. Price

Research output: Contribution to journalArticle

111 Citations (Scopus)

Abstract

DNA double-strand breaks (DSBs) arise through both replication errors and from exogenous events such as exposure to ionizing radiation. DSBs are potentially lethal, and cells have evolved a highly conserved mechanism to detect and repair these lesions. This mechanism involves phosphorylation of histone H2AX (γH2AX) and the loading of DNA repair proteins onto the chromatin adjacent to the DSB. It is now clear that the chromatin architecture in the region surrounding the DSB has a critical impact on the ability of cells to mount an effective DNA damage response. DSBs promote the formation of open, relaxed chromatin domains which are spatially confined to the area surrounding the break. These relaxed chromatin structures are created through the coupled action of the p400 SWI /SNF ATPase and histone acetylation by the Tip60 acetyltransferase. The resulting destabilization of nucleosomes at the DSB by Tip60 and p400 is required for ubiquitination of the chromatin by the RNF8 ubiquitin ligase, and for the subsequent recruitment of the brca1 complex. Chromatin dynamics at DSBs can therefore exert a powerful influence on the process of DSB repair. Further, there is emerging evidence that the different chromatin structures in the cell, such as heterochromatin and euchromatin, utilize distinct remodeling complexes and pathways to facilitate DSB. The processing and repair of DSB is therefore critically influenced by the nuclear architecture in which the lesion arises.

Original languageEnglish (US)
Pages (from-to)261-267
Number of pages7
JournalCell Cycle
Volume10
Issue number2
DOIs
StatePublished - Jan 15 2011
Externally publishedYes

Fingerprint

Double-Stranded DNA Breaks
Chromatin
Histones
Euchromatin
Acetyltransferases
Heterochromatin
Nucleosomes
Ubiquitination
Acetylation
Ligases
Ubiquitin
Ionizing Radiation
DNA Repair
DNA Damage
Adenosine Triphosphatases
Phosphorylation

Keywords

  • Acetylation
  • Chromatin remodeling
  • DNA repair
  • H2AX
  • NuA4
  • Nucleosome
  • p400
  • Tip60

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Cite this

Chromatin dynamics and the repair of DNA double strand breaks. / Xu, Ye; Price, Brendan D.

In: Cell Cycle, Vol. 10, No. 2, 15.01.2011, p. 261-267.

Research output: Contribution to journalArticle

Xu, Ye ; Price, Brendan D. / Chromatin dynamics and the repair of DNA double strand breaks. In: Cell Cycle. 2011 ; Vol. 10, No. 2. pp. 261-267.
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