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Reference: Ferreiro JA, et al. (2006) Roles for Gcn5p and Ada2p in transcription and nucleotide excision repair at the Saccharomyces cerevisiae MET16 gene. Nucleic Acids Res 34(3):976-85

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Abstract


Chromatin structure, transcription and repair of cyclobutane pyrimidine dimers at the MET16 gene of wild type, gcn5Delta and ada2Delta Saccharomyces cerevisiae cells were studied under repressing or derepressing conditions. These two components of the SAGA/ADA chromatin remodelling complexes are expendable for the basal transcription of MET16 but are mandatory for its full transcription induction. Despite their influence on transcription neither protein induces major changes in MET16 chromatin structure, but some minor ones occur. Repair at the coding region of the transcribed strand is faster than repair at non-transcribed regions in all strains and either growth condition. Moreover, the more MET16 is transcribed the faster the repair. The data show that by changing the transcription extent the rate of repair at each DNA strand is altered in a different way, confirming that repair at this locus is strongly modulated by its chromatin structure and transcription level. Deletion of GCN5 or ADA2 reduces repair at MET16. The results are discussed in light of the current understanding of Gcn5p and Ada2p functions, and they are the first to report a role for Ada2p in the nucleotide excision repair of the regulatory and transcribed regions of a gene.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Ferreiro JA, Powell NG, Karabetsou N, Mellor J, Waters R
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