Methylation Sensitive Restriction Enzymes (MSREs) play a role in the analysis of methylated DNA. MSREs are used to analyze the methylation status of cytosine residues in CpG sequences. These restriction enzymes, as their name implies, are not able to cleave methylated-cytosine residues, leaving methylated DNA intact. MSREs cleave DNA at specific unmethylated-cytosine residues. DNA is amplified by PCR following digestion. Because unmethylated DNA is digested by MSREs, the only amplification products detected are methylated DNA. It is imperative to fully digest the DNA before PCR amplification to generate accurate data.
The table below provides a summary list of methylation sensitive restriction enzymes (MSREs) that may be useful for mammalian epigenetics analyses when used with CpG methylase.