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Nucleic Acids Research, 2000, Vol. 28, No. 5 1114-1119
© 2000 Oxford University Press

Excision repair at the level of the nucleotide in the upstream control region, the coding sequence and in the region where transcription terminates of the Saccharomyces cerevisiae MFA2 gene and the role of RAD26

Yumin Teng and Raymond Waters*

School of Biological Sciences, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK

RAD26, the yeast homologue of human CSB, has an essential role in transcription-coupled repair (TCR). We have mapped the requisite of Rad26 for nucleotide excision repair (NER) within the different regions of the yeast Saccharomyces cerevisiae MFA2 gene at nucleotide resolution. Our results show that Rad26 is dispensable for enhanced NER in both the MFA2 upstream promoter, except in the TATA box region, and for enhanced NER in both strands of the active gene at a site close to the transcription termination region. As expected, it is not needed for repair of regions downstream of where transcription terminates. However, it is required for TCR in the transcription initiation and elongation regions. Our data support the hypothesis that Rad26 is required for the interchange between holo-TFIIH and a putative repairosome containing core TFIIH and other NER proteins. Close to the end of transcription, hotspots for the repair of CPDs in both the transcribed strand and the non-transcribed strand occur. This enhanced repair is independent of Rad26. Hence, TFIIH may take a form favourable for forming a repairosome without Rad26 assistance; here the organisation of the DNA during the termination of transcription may facilitate access of a repair complex to enable enhanced repair of both strands.

* To whom correspondence should be addressed. Tel: +44 1792 295384; Fax: +44 1792 295447; Email: r.waters@swansea.ac.uk


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