نتایج جستجو برای: 5 methylcytosine
تعداد نتایج: 1216212 فیلتر نتایج به سال:
Human thymine DNA glycosylase (hTDG) efficiently excises 5-carboxylcytosine (5caC), a key oxidation product of 5-methylcytosine in genomic DNA, in a recently discovered cytosine demethylation pathway. We present here the crystal structures of the hTDG catalytic domain in complex with duplex DNA containing either 5caC or a fluorinated analog. These structures, together with biochemical and compu...
The overall 5-methylcytosine content of DNA from normal, benign hyperplastic, and neoplastic human prostate tissue was analyzed. DNA methylation levels were significantly lower in prostates with benign prostatic hyperplasia and metastatic tumors. In contrast, nonmetastatic prostate tumor DNA had a 5-methylcytosine content essentially the same as in normal tissue. The results suggest a correlati...
Three methylated bases, 5-methylcytosine, N4-methylcytosine and N6-methyladenine (m6A), can be found in DNA. However, to date, only 5-methylcytosine has been detected in mammalian genomes. To reinvestigate the presence of m6A in mammalian DNA, we used a highly sensitive method capable of detecting one N6-methyldeoxyadenosine per million nucleosides. Our results suggest that the total mouse geno...
We developed a novel strategy by oxidation-derivatization combined mass spectrometry analysis for the determination of 5-hydroxymethylcytosine and 5-formylcytosine in both DNA and RNA. We reported the presence of 5-formylcytosine in RNA of mammals and found that ascorbic acid and hydroquinone can increase the oxidation of 5-methylcytosine to 5-hydroxymethylcytosine in DNA and RNA.
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