Identification of 3,N4-Etheno-5-methyl-2′-deoxycytidine in Human DNA: A New Modified Nucleoside Which May Perturb Genome Methylation
摘要:
Methylation of cytidine at dCpdG sequences regulates gene expression and is altered in many chronic inflammatory diseases. Inflammation generates lipid peroxidation (LPO) products which can react with deoxycytidine, deoxyadenosine, and deoxyguanosine in DNA to form pro-mutagenic exocyclic etheno-nucleoside residues. Since 5-methyl-2'-deoxycytidine (5mdC) residues exhibit increased nucleophilicity at N3, they should be even better targets for LPO products. We synthesized and characterized 3,N-4-etheno-5-methyl-2'-deoxycytidine-3'-phosphate and showed that LPO products can indeed form the corresponding etheno-5mdC (epsilon 5mdC) lesion in DNA in vitro. Our newly developed P-32-postlabeling method was subsequently used to detect epsilon 5mdC lesions in DNA from human white blood cells, lung, and liver at concentrations 4-10 times higher than that observed for etheno adducts on nonmethylated cytidine. Our new detection method can now be used to explore the hypothesis that this DNA lesion perturbs the DNA methylation status.
Identification of 3,N4-Etheno-5-methyl-2′-deoxycytidine in Human DNA: A New Modified Nucleoside Which May Perturb Genome Methylation
摘要:
Methylation of cytidine at dCpdG sequences regulates gene expression and is altered in many chronic inflammatory diseases. Inflammation generates lipid peroxidation (LPO) products which can react with deoxycytidine, deoxyadenosine, and deoxyguanosine in DNA to form pro-mutagenic exocyclic etheno-nucleoside residues. Since 5-methyl-2'-deoxycytidine (5mdC) residues exhibit increased nucleophilicity at N3, they should be even better targets for LPO products. We synthesized and characterized 3,N-4-etheno-5-methyl-2'-deoxycytidine-3'-phosphate and showed that LPO products can indeed form the corresponding etheno-5mdC (epsilon 5mdC) lesion in DNA in vitro. Our newly developed P-32-postlabeling method was subsequently used to detect epsilon 5mdC lesions in DNA from human white blood cells, lung, and liver at concentrations 4-10 times higher than that observed for etheno adducts on nonmethylated cytidine. Our new detection method can now be used to explore the hypothesis that this DNA lesion perturbs the DNA methylation status.
The present invention relates, in general to, compounds, compositions and methods useful for modulating gene expression of multiple target nucleic acids by a single chemical entity.
本发明总体上涉及通过单一化学实体调节多种靶核酸基因表达的化合物、组合物和方法。
Inhibitor of demethylase, antitumorigenic agent, and an in vitro assay for demethylase inhibitors
申请人:Szyf Moshe
公开号:US20050003378A1
公开(公告)日:2005-01-06
The present invention relates to a DNA demethylase (dMTase) inhibitor which comprises s-adenosylmethionine, a metabolite of s-adenosylmethionine or a pharmaceutically acceptable salt thereof.
本发明涉及一种 DNA 去甲基化酶(dMTase)抑制剂,它包括 s-腺苷蛋氨酸、s-腺苷蛋氨酸的代谢物或其药学上可接受的盐。
MULTI-TARGETED SINGLE ENTITY CONJUGATES
申请人:Alnylam Pharmaceuticals, Inc.
公开号:EP3324980B1
公开(公告)日:2021-11-10
Identification of 3,<i>N</i><sup>4</sup>-Etheno-5-methyl-2′-deoxycytidine in Human DNA: A New Modified Nucleoside Which May Perturb Genome Methylation
作者:Jagadeesan Nair、Roger W. Godschalk、Urmila Nair、Robert W. Owen、William E. Hull、Helmut Bartsch
DOI:10.1021/tx200392a
日期:2012.1.13
Methylation of cytidine at dCpdG sequences regulates gene expression and is altered in many chronic inflammatory diseases. Inflammation generates lipid peroxidation (LPO) products which can react with deoxycytidine, deoxyadenosine, and deoxyguanosine in DNA to form pro-mutagenic exocyclic etheno-nucleoside residues. Since 5-methyl-2'-deoxycytidine (5mdC) residues exhibit increased nucleophilicity at N3, they should be even better targets for LPO products. We synthesized and characterized 3,N-4-etheno-5-methyl-2'-deoxycytidine-3'-phosphate and showed that LPO products can indeed form the corresponding etheno-5mdC (epsilon 5mdC) lesion in DNA in vitro. Our newly developed P-32-postlabeling method was subsequently used to detect epsilon 5mdC lesions in DNA from human white blood cells, lung, and liver at concentrations 4-10 times higher than that observed for etheno adducts on nonmethylated cytidine. Our new detection method can now be used to explore the hypothesis that this DNA lesion perturbs the DNA methylation status.