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Reference: Suter B, et al. (2000) DNA repair in a yeast origin of replication: contributions of photolyase and nucleotide excision repair. Nucleic Acids Res 28(10):2060-8

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Abstract

DNA damage formation and repair are tightly linked to protein-DNA interactions in chromatin. We have used minichromosomes in yeast as chromatin substrates in vivo to investigate how nucleotide excision repair (NER) and repair by DNA-photolyase (photoreactivation) remove pyrimidine dimers from an origin of replication ( ARS1 ). The ARS1 region is nuclease sensitive and flanked by nucleosomes on both sides. Photoreactivation was generally faster than NER at all sites. Site-specific heterogeneity of repair was observed for both pathways. This heterogeneity was different for NER and photoreactivation and it was altered in a minichromosome where ARS1 was transcribed. The results indicate distinct inter-actions of the repair systems with protein complexes bound in the ARS region (ORC, Abf1) and a predominant role of photolyase in CPD repair of an origin of replication.

Reference Type
Journal Article
Authors
Suter B, Wellinger RE, Thoma F
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