5-Methylcytidine

5-Methylcytidine (CAS No.: 2140-61-6) is a naturally occurring modified nucleoside derived from 5-methylcytosine and present as a minor constituent in RNA and, in certain organisms, DNA, where it contributes to the regulation of nucleic acid structure and function. As a pyrimidine nucleoside analog, it is closely associated with epigenetic regulation, particularly through its involvement in DNA and RNA methylation processes that influence genomic imprinting, gene expression, and cellular differentiation. This compound has been shown to modulate biological signaling pathways and enzymatic activities linked to methylation-dependent mechanisms, making it a valuable tool for investigating epigenetic control in cancer biology, metabolic regulation, and developmental processes. In addition, 5-Methylcytidine exhibits antiviral activity, with reported inhibitory effects against herpes simplex virus type 1 in the nanomolar range, suggesting potential utility in antiviral research and nucleoside-based drug discovery. In experimental settings, it is commonly employed in cell-based assays and molecular studies aimed at elucidating RNA modifications and methylation dynamics, with concentrations or dosing strategies varying according to specific model systems and research objectives.