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Overview
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Background
5-Methoxy-UTP is an analogue of the naturally occurring uridine triphosphate (UTP). Similar to N1-methylpseudouridine and pseudouridine modifications, 5-methoxyuridine is another common chemical modification used for in vitro mRNA synthesis in order to improve mRNA activity and reduce innate immune responses. Chemical modifications of mRNAs with 5-methoxyuridine, N1-methylpseudouridine and pseudouridine have been shown to significantly improve the expression of enhanced green fluorescent protein (eGFP) in a variety of cell lines, among which 5-methoxyuridine-modified eGFP mRNA is more stable than other eGFP mRNAs. In addition, replacing UTP with 5-methoxy-UTP in Cas9 mRNA has also been reported to reduce innate immune responses, making the broad use of Cas9 possible both in vitro and in vivo.
1. Li B, Luo X, Dong Y. Effects of Chemically Modified Messenger RNA on Protein Expression. Bioconjugate Chemistry, 2016, 27(3): 849-853.
2. Vaidyanathan S, Azizian KT, Haque AKMA, et al. Uridine Depletion and Chemical Modification Increase Cas9 mRNA Activity and Reduce Immunogenicity without HPLC Purification. Molecular Therapy - Nucleic Acids, 2018, 12: 530-542.
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- Properties
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Overview