Choreography of oxidative damage repair in mammalian genomes

Sankar Mitra, Tadahide Izumi, Istvan Boldogh, Kishor K. Bhakat, Jeff W. Hill, Tapas Hazra

Research output: Contribution to journalArticle

114 Citations (Scopus)

Abstract

The lesions induced by reactive oxygen species in both nuclear and mitochondrial genomes include altered bases, abasic (AP) sites, and single-strand breaks, all repaired primarily via the base excision repair (BER) pathway. Although the basic BER process (consisting of five sequential steps) could be reconstituted in vitro with only four enzymes, it is now evident that repair of oxidative damage, at least in mammalian cell nuclei, is more complex, and involves a number of additional proteins, including transcription- and replication-associated factors. These proteins may be required in sequential repair steps in concert with other cellular changes, starting with nuclear targeting of the early repair enzymes in response to oxidative stress, facilitation of lesion recognition, and access by chromatin unfolding via histone acetylation, and formation of metastable complexes of repair enzymes and other accessory proteins. Distinct, specific subclasses of protein complexes may be formed for repair of oxidative lesions in the nucleus in transcribed vs. nontranscribed sequences in chromatin, in quiescent vs. cycling cells, and in nascent vs. parental DNA strands in replicating cells. Characterizing the proteins for each repair subpathway, their signaling-dependent modifications and interactions in the nuclear as well as mitochondrial repair complexes, will be a major focus of future research in oxidative damage repair.

Original languageEnglish (US)
Pages (from-to)15-28
Number of pages14
JournalFree Radical Biology and Medicine
Volume33
Issue number1
DOIs
StatePublished - Jul 1 2002

Fingerprint

Repair
Genes
Genome
Proteins
DNA Repair
Chromatin
Enzymes
Mitochondrial Genome
Acetylation
Cell Nucleus
Histones
Reactive Oxygen Species
Oxidative Stress
Oxidative stress
DNA
Accessories
Transcription
Cells

Keywords

  • Base excision repair
  • Chromatin unfolding
  • Coordination of repair reactions
  • DNA damage
  • Free radicals
  • Organelle targeting

ASJC Scopus subject areas

  • Medicine(all)
  • Toxicology
  • Clinical Biochemistry

Cite this

Choreography of oxidative damage repair in mammalian genomes. / Mitra, Sankar; Izumi, Tadahide; Boldogh, Istvan; Bhakat, Kishor K.; Hill, Jeff W.; Hazra, Tapas.

In: Free Radical Biology and Medicine, Vol. 33, No. 1, 01.07.2002, p. 15-28.

Research output: Contribution to journalArticle

Mitra, Sankar ; Izumi, Tadahide ; Boldogh, Istvan ; Bhakat, Kishor K. ; Hill, Jeff W. ; Hazra, Tapas. / Choreography of oxidative damage repair in mammalian genomes. In: Free Radical Biology and Medicine. 2002 ; Vol. 33, No. 1. pp. 15-28.
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