Chemical and biological consequences of oxidatively damaged guanine in DNA.

Chemical and biological consequences of oxidatively damaged guanine in DNA.
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DOI:
10.3109/10715762.2011.653968
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发表时间:
2012-04
影响因子:
3.3
通讯作者:
Yennie CJ
Yennie CJ
中科院分区:
生物学3区
文献类型:
--
作者:
Delaney S;Jarem DA;Volle CB;Yennie CJ

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在四种天然核苷中,2′-脱氧鸟苷(dGuo)最容易被氧化。由dGuo衍生的两种病变是8-oxo-7,8-dihydro-2′-deoxyguanosine(8-oxodGuo)和2,6-diamino-4-hydroxy-5-formamidopyrimidine(Fn)·dGuo。此外,虽然可以在基因组DNA中检测到8-oxodGuo的稳态水平,但也已知8-oxodGuo比dGuo更容易氧化。因此,8-oxodGuo易于进一步氧化以形成几种过氧化的dGuo产物。本文综述了氧化损伤的DNA,特别是8-oxodGuo、Fexo·dGuo和过氧化dGuo产物的结构影响、致突变性和遗传毒性潜力以及生物学意义。
Of the four native nucleosides, 2′-deoxyguanosine (dGuo) is most easily oxidized. Two lesions derived from dGuo are 8-oxo-7,8-dihydro-2′-deoxyguanosine (8-oxodGuo) and 2,6-diamino-4-hydroxy-5-formamidopyrimidine (Fapy)·dGuo. Furthermore, while steady-state levels of 8-oxodGuo can be detected in genomic DNA, it is also known that 8-oxodGuo is more easily oxidized than dGuo. Thus, 8-oxodGuo is susceptible to further oxidation to form several hyperoxidized dGuo products. This review addresses the structural impact, the mutagenic and genotoxic potential, and biological implications of oxidatively damaged DNA, in particular 8-oxodGuo, Fapy·dGuo, and the hyperoxidized dGuo products.
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