Abstract:Epigenetic control by methylation is directly dependent on SAM/methionine. Free methionine aside from being used for protein synthesis is activated to universal methyl group donor SAM and the methyl group from it can be transferred mainly onto DNA, histones, mRNA and noncoding (Nc) RNA, in the nucleus and onto various cytosolic recipients by specific methyltransferases. The product S-adenosylhomocysteine (SAH) from methyltransferase reaction is cleaved into free homocysteine and adenosine. Homocysteine has two… Show more
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