Online Inquiry

For Lab Research Use Only, Not for Human or Animal Therapeutic Use.

  • Verification code
    Click image to refresh the verification code.

Replacement of dC with 5-Methyl-dC

Replacing dC with 5-methyl-dC in an oligonucleotide can increase its stability and improve its ability to hybridize with its target compared with unmodified form. Besides, anti-sense oligonucleotides containing 5-methyl-dC of a CpG motif can reduce undesirable immune responses. Hence, this modification plays an essential role in antisense oligonucleotide applications. Creative Biolabs is a world-leading service provider in the field of oligonucleotide synthesis and modification. Equipped with rich expertise and first-in-class technical platform, we are very honored to offer reliable anti-sense oligonucleotides in which dC is replaced with 5-methyl-dC to promote our clients’ related project development.

Introduction of 5-Methyl-dC

5-Methyl-dC is a methylated form of the DNA base dC. It is one of the important epigenetic modifications in living organisms, involved in the regulation of gene transcription. Oligonucleotides modified with 5-Methyl-dC have been used as effective research tools to investigate the effects of DNA methylation in the progression of some diseases such as tumors. Furthermore, 5-Methyl-dC modification is also applied in the synthesis of therapeutic antisense oligonucleotide. In vivo study has revealed anti-sense oligonucleotides containing a CpG motif can induce pro-inflammatory responses via activation of Toll-like receptor 9 (TLR9). While the replacement of dC with 5-Methyl-dC can prevent or dramatically reduce these unwanted immune responses. Besides, dC replaced with 5-Methyl-dC also increases Tm by as much as 0.5 °C per insertion, thereby increasing the stability of duplex oligonucleotide.

Structure of 5-Methyl-dC. Figure 1. Structure of 5-Methyl-dC.

Our Services

It is of importance for therapeutic oligonucleotide synthesis via replacing dC with 5-Methyl-dC in a CpG motif. Based on our leading-edge technical platform, we are capable of offering high-quality service of oligonucleotide synthesis and modification by replacing dC with 5-Methyl-dC. This modification will improve oligo stability and reduce or prevent unwished pro-inflammatory responses. Besides, our excellent experts also tailor a variety of flexible solutions for oligonucleotide synthesis and modification according to your special project demands.


With years of experience in the field of custom oligo synthesis and modification, Creative Biolabs devotes to offering high-level and cost-efficient oligo synthesis and modification services. With the help of our 5-Methyl-dC modification service, our clients attain more than high-quality oligo products in which dC is replaced with 5-methyl-dC, as well as in-depth scientific and technical support on everything from project consultation, design to implementation from an experienced expert team. If you are interested in our services, please feel free to contact us for more details.

For Lab Research Use Only, Not for Human or Animal Therapeutic Use.

Interested in our expertise?

Contact us for more information

Get free consultations


  • Tel:
  • Email:


Easy access to products and services you need from our library via powerful searching tools

Enter your email here to subscribe.


Follow us on

For Lab Research Use Only, Not for Human or Animal Therapeutic Use.

Copyright © 2021 Creative Biolabs. All Rights Reserved.