Divergent synthesis of 5-substituted pyrimidine 2′-deoxynucleosides and their incorporation into oligodeoxynucleotides for the survey of uracil DNA glycosylases,Chemical Science

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Divergent synthesis of 5-substituted pyrimidine 2′-deoxynucleosides and their incorporation into oligodeoxynucleotides for the survey of uracil DNA glycosylases
Chemical Science ( IF 7.6 ) Pub Date : 2020-10-07 , DOI: 10.1039/d0sc04161k
Ai Tran ₁ , Song Zheng ₁ , Dawanna S White ₂ , Alyson M Curry ₂ , Yana Cen _{2,

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Affiliation

Recent studies have indicated that 5-methylcytosine (5mC) residues in DNA can be oxidized and potentially deaminated to the corresponding thymine analogs. Some of these oxidative DNA damages have been implicated as new epigenetic markers that could have profound influences on chromatin function as well as disease pathology. In response to oxidative damage, the cells have a complex network of repair systems that recognize, remove and rebuild the lesions. However, how the modified nucleobases are detected and repaired remains elusive, largely due to the limited availability of synthetic oligodeoxynucleotides (ODNs) containing these novel DNA modifications. A concise and divergent synthetic strategy to 5mC derivatives has been developed. These derivatives were further elaborated to the corresponding phosphoramidites to enable the site-specific incorporation of modified nucleobases into ODNs using standard solid-phase DNA synthesis. The synthetic methodology, along with the panel of ODNs, is of great value to investigate the biological functions of epigenetically important nucleobases, and to elucidate the diversity in chemical lesion repair.

中文翻译：

5-取代嘧啶 2'-脱氧核苷的不同合成及其掺入寡脱氧核苷酸中用于尿嘧啶 DNA 糖基化酶的研究

最近的研究表明，DNA 中的 5-甲基胞嘧啶 (5mC) 残基可以被氧化并可能脱氨基为相应的胸腺嘧啶类似物。其中一些氧化性 DNA 损伤被认为是新的表观遗传标记，可能对染色质功能和疾病病理学产生深远影响。为了应对氧化损伤，细胞具有复杂的修复系统网络，可以识别、去除和重建病变。然而，如何检测和修复修饰的核碱基仍然难以捉摸，这主要是由于含有这些新型 DNA 修饰的合成寡脱氧核苷酸 (ODN) 的可用性有限。已经开发出一种简洁且发散的 5mC 衍生物合成策略。这些衍生物被进一步加工成相应的亚磷酰胺，从而能够使用标准固相 DNA 合成将修饰的核碱基位点特异性掺入 ODN 中。该合成方法以及 ODN 组对于研究表观遗传学重要核碱基的生物学功能以及阐明化学损伤修复的多样性具有重要价值。

更新日期：2020-10-12

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