Intracellular detection of cytosine incorporation in genomic DNA by using 5-ethynyl-2'-deoxycytidine.

Intracellular detection of cytosine incorporation in genomic DNA by using 5-ethynyl-2'-deoxycytidine.
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DOI:
10.1002/cbic.201100353
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发表时间:
2011-09-19
期刊:
影响因子:
3.2
通讯作者:
Greenberg, Marc M.
Greenberg, Marc M.
中科院分区:
生物学3区
文献类型:
--
作者:
Guan, Lirui;van der Heijden, Godfried W.;Bortvin, Alex;Greenberg, Marc M.

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合成了5-乙炔基-2 ′-脱氧胞苷三磷酸(5-Ethynyl-2′-deoxycytidine triphosphate,EdCTP)作为探针,与荧光标记结合使用,以便于分析以DNA为中心的过程(DNA复制、修复和胞嘧啶去甲基化)的体内动力学。动力学分析表明,EdCTP被Klenow exo-和DNA聚合酶β接受为底物。这些酶将5-乙炔基-2 ′-脱氧胞苷(EdC)掺入DNA的效率至多略低于天然dC。在聚合酶掺入和T4 DNA连接酶介导的连接之后,使用具有荧光叠氮化物的点击反应使含有EdC的DNA可视化。随后在小鼠雄性生殖细胞和受精卵中的实验表明,EdC是体内DNA复制的特异性和可靠的报告基因。
5-Ethynyl-2′-deoxycytidine triphosphate (EdCTP) was synthesized as a probe to be used in conjunction with fluorescent labelling to facilitate the analysis of the in vivo dynamics of DNA-centered processes (DNA replication, repair and cytosine demethylation). Kinetic analysis showed that EdCTP is accepted as a substrate by Klenow exo- and DNA polymerase β. Incorporation of 5-ethynyl-2′-deoxycytidine (EdC) into DNA by these enzymes is at most modestly less efficient than native dC. EdC containing DNA was visualized using a click reaction with a fluorescent azide, following polymerase incorporation and T4 DNA ligase mediated ligation. Subsequent experiments in mouse male germ cells and zygotes demonstrated that EdC is a specific and reliable reporter of DNA replication in vivo.
DOI: 10.1002/anie.201007805
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期刊: Angewandte Chemie (International ed. in English)
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