5-Methyl-2'-deoxycytidine in single-stranded DNA can act in cis to signal de novo DNA methylation[1][2].
References:
[1]. Christman JK, et al. 5-Methyl-2'-deoxycytidine in single-stranded DNA can act in cis to signal de novo DNA methylation. Proc Natl Acad Sci U S A. 1995 Aug 1;92(16):7347-51.
[2]. Testillano PS, et al. The 5-methyl-deoxy-cytidine (5mdC) localization to reveal in situ the dynamics of DNA methylation chromatin pattern in a variety of plant organ and tissue cells during development. Physiol Plant. 2013 Sep;149(1):104-13.
















