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, 30 (1), 2-10

Base Excision Repair of Oxidative DNA Damage and Association With Cancer and Aging


Base Excision Repair of Oxidative DNA Damage and Association With Cancer and Aging

Scott Maynard et al. Carcinogenesis.


Aging has been associated with damage accumulation in the genome and with increased cancer incidence. Reactive oxygen species (ROS) are produced from endogenous sources, most notably the oxidative metabolism in the mitochondria, and from exogenous sources, such as ionizing radiation. ROS attack DNA readily, generating a variety of DNA lesions, such as oxidized bases and strand breaks. If not properly removed, DNA damage can be potentially devastating to normal cell physiology, leading to mutagenesis and/or cell death, especially in the case of cytotoxic lesions that block the progression of DNA/RNA polymerases. Damage-induced mutagenesis has been linked to various malignancies. The major mechanism that cells use to repair oxidative damage lesions, such as 8-hydroxyguanine, formamidopyrimidines, and 5-hydroxyuracil, is base excision repair (BER). The BER pathway in the nucleus is well elucidated. More recently, BER was shown to also exist in the mitochondria. Here, we review the association of BER of oxidative DNA damage with aging, cancer and other diseases.


Fig. 1.
Fig. 1.
Single-strand break repair pathways. BER corrects damaged bases by first generating SSBs, through the activity of glycosylases. An alternative pathway corrects SSBs that arise directly. One of the most common sources of direct SSBs is oxidative attack by endogenous ROS. Filled diamond, damaged or non-conventional bases (e.g. uracil); AP, apurinic/apyrimidinic site; filled circles, dRP abasic residue; circle with star, abasic residue that is refractory to POLβ lyase activity; thick lines, incorporated nucleotides; P, phosphate; UA, unsaturated aldehyde; PG, 3'-phosphoglycolate.

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