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Complementary roles of yeast rad4p and rad34p in nucleotide excision repair of active and inactive rRNA gene chromatin

Tremblay, Maxime, Teng, Yumin, Paquette, Michel, Waters, Raymond and Conconi, Antonio 2008. Complementary roles of yeast rad4p and rad34p in nucleotide excision repair of active and inactive rRNA gene chromatin. Molecular and Cellular Biology 28 (24) , pp. 7504-7513. 10.1128/MCB.00137-08

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Nucleotide excision repair (NER) removes a plethora of DNA lesions. It is performed by a large multisubunit protein complex that finds and repairs damaged DNA in different chromatin contexts and nuclear domains. The nucleolus is the most transcriptionally active domain, and in yeast, transcription-coupled NER occurs in RNA polymerase I-transcribed genes (rDNA). Here we have analyzed the roles of two members of the xeroderma pigmentosum group C family of proteins, Rad4p and Rad34p, during NER in the active and inactive rDNA. We report that Rad4p is essential for repair in the intergenic spacer, the inactive rDNA coding region, and for strand-specific repair at the transcription initiation site, whereas Rad34p is not. Rad34p is necessary for transcription-coupled NER that starts about 40 nucleotides downstream of the transcription initiation site of the active rDNA, whereas Rad4p is not. Thus, although Rad4p and Rad34p share sequence homology, their roles in NER in the rDNA locus are almost entirely distinct and complementary. These results provide evidences that transcription-coupled NER and global genome NER participate in the removal of UV-induced DNA lesions from the transcribed strand of active rDNA. Furthermore, nonnucleosome rDNA is repaired faster than nucleosome rDNA, indicating that an open chromatin structure facilitates NER in vivo.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: Q Science > QH Natural history > QH426 Genetics
Q Science > QR Microbiology
Additional Information: Pdf uploaded in accordance with publisher's policy at (accessed 25/02/2014)
Publisher: American Society for Microbiology
ISSN: 0270-7306
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 03:49

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