On the irrelevancy of hydroxyl radical to DNA damage from oxidative stress and implications for epigenetics.

On the irrelevancy of hydroxyl radical to DNA damage from oxidative stress and implications for epigenetics.
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DOI:
10.1039/d0cs00579g
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发表时间:
2020-09-21
影响因子:
46.2
通讯作者:
Burrows CJ
Burrows CJ
中科院分区:
化学1区
文献类型:
--
作者:
Fleming AM;Burrows CJ

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Contrary to frequent reports in the literature, hydroxyl radical is not a key species participating in endogenous oxidative DNA damage. Instead, carbonate radical anion is formed from the Fenton reaction under cellular conditions and from decomposition of nitrosoperoxycarbonate generated during inflammation. Carbonate radical anion is a potent one-electron oxidant capable of generating base radical cations that can migrate over long distances in duplex DNA, ultimately generating 8-oxo-7,8-dihydroguanine at a redox-sensitive sequence such as GGG. Such a mechanism enables G-quadruplex-forming sequences to act as long-range sensors of oxidative stress, impacting gene expression via the DNA repair mechanism that reads and ultimately erases the oxidized base. With a writing, reading and erasing mechanism in place, oxidative ‘damage’ to DNA might be relabeled as ‘epigenetic’ modifications.
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