Abstract
5,6-Dihydroxy-5,6-dihydrothymine (thymine glycol) and 7,8-dihydro-8-oxo-2′-deoxyguanosine (8-oxodG) are major DNA damage lesions produced by endogenous oxidative stress, as well as inflicted by carcinogens and ionizing radiation. The processing of Tg:G mismatch and 8-oxodG in close proximity of each other in a bistranded clustered environment in DNA oligomer duplexes as well as in a nucleosome core particle (NCP) model are reported here. The processing of the lesions was evaluated by purified enzyme cocktails of hNTH1 and hOGG1 as well as with a HeLa cell extract. Interestingly, the yield of double-strand breaks (DSBs) resulting from the processing of the bistranded lesions are appreciably lower when the DNA is treated with the HeLa cell extract compared with the relevant purified enzyme cocktail in both models. Clustered bistranded lesions become more repair refractive when reconstituted as an NCP. This indicates a complex interplay between the repair enzymes that influence the processing of the bistranded cluster damage positively to avoid the formation of DSBs under cellular conditions. In addition to position and orientation of the lesions, the type of the lesions in the cluster environment in DNA along with the relative abundance of the lesion-specific enzymes in the cells strongly prevents the processing of the oxidized nucleobases.
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Acknowledgements
This work was supported by a grant from the Department of Science and Technology, Govt. of India (SERB, Grant No. SR/FT/LS-36/2010). The authors are thankful to IIT Patna and NIPER Hajipur for infrastructure and experimental facilities.
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Kumari, B., Sinha, K.K. & Das, P. Complex interplay of lesion-specific DNA repair enzyme on bistranded clustered DNA damage harboring Tg:G mismatch in nucleosome core particles. J Biosci 43, 575–583 (2018). https://doi.org/10.1007/s12038-018-9786-x
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DOI: https://doi.org/10.1007/s12038-018-9786-x