نتایج جستجو برای: 5 methylcytosine
تعداد نتایج: 1216212 فیلتر نتایج به سال:
For several decades, 5-methylcytosine (5mC) has been thought to be the only DNA modification with a functional significance in metazoans. The discovery of enzymatic oxidation of 5mC to 5-hydroxymethylcytosine (5hmC), 5-formylcytosine (5fC) and 5-carboxylcytosine (5caC) as well as detection of N6-methyladenine (6mA) in the DNA of multicellular organisms provided additional degrees of complexity ...
The efficient formation of 5-methylcytosine glycol (mCg) and its facile deamination to thymine glycol (Tg) may account for the prevalent C → T transition mutation found at methylated CpG site (mCpG) in human p53 gene, a hallmark for many types of human tumors. In this work, the hydrolytic deamination of mCg was investigated at the MP2 and B3LYP levels of theory using the 6-311G(d,p) basis set. ...
Epigenetic reprogramming of the parental genome occurs in fertilized oocytes and involves oxidation of 5-methylcytosines (5-mC) to 5-hydroxymethylcytosines (5-hmC) in the paternal pronucleus. Recent work has shown that the maternal genome is protected from this remodeling step by an interaction between a modified histone, H3K9me2, and the oocyte-derived factor, PGC7, to prevent oxidation of the...
Thymine intermediate 17 has been synthesized on a multigram scale (50 g, 70 mmol) from starting sugar 1 in 15 steps in an overall yield of 73%, with only 5 purification steps. The key thymine intermediate 18 was obtained from 17 in a single step in 96% yield, whereas the key 5-methylcytosine intermediate 20 was obtained from 17 in 2 steps in 58% yield. This highly efficient large scale route ne...
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