Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-32406
van Loon, B; Hübscher, U (2009). An 8-oxo-guanine repair pathway coordinated by MUTYH glycosylase and DNA polymerase lambda. Proceedings of the National Academy of Sciences of the United States of America (PNAS), 106(43):18201-18206.
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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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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||05 Vetsuisse Faculty > Institute of Veterinary Biochemistry and Molecular Biology|
|DDC:||570 Life sciences; biology|
|Deposited On:||25 Feb 2010 14:31|
|Last Modified:||27 Nov 2013 19:50|
|Publisher:||National Academy of Sciences|
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