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Proc Natl Acad Sci U S A. 2009 Oct 27;106(43):18201-6. doi: 10.1073/pnas.0907280106. Epub 2009 Oct 9.

An 8-oxo-guanine repair pathway coordinated by MUTYH glycosylase and DNA polymerase lambda.

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Institute of Veterinary Biochemistry and Molecular Biology, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.


Reactive oxygen species (ROS) interact with DNA, frequently generating highly mutagenic 7,8-dihydro-8-oxoguanine (8-oxo-G) lesions. Replicative DNA polymerases (pols) often misincorporate adenine opposite 8-oxo-G. The subsequent repair mechanism allowing the removal of adenine and formation of C:8-oxo-G base pair is essential to prevent C:G to A:T transversion mutations. Here, we show by immunofluorescence experiments, in cells exposed to ROS, the involvement of MutY glycosylase homologue (MUTYH) and DNA pol lambda in the repair of A:8-oxo-G mispairs. We observe specific recruitment of MUTYH, DNA pol lambda, proliferating cell nuclear antigen (PCNA), flap endonuclease 1 (FEN1) and DNA ligases I and III from human cell extracts to A:8-oxo-G DNA, but not to undamaged DNA. Using purified human proteins and a DNA template, we reconstitute the full pathway for the faithful repair of A:8-oxo-G mispairs involving MUTYH, DNA pol lambda, FEN1, and DNA ligase I. These results reveal a cellular response pathway to ROS, important to sustain genomic stability and modulate carcinogenesis.

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