Introduction I was researching possible failure modes of plasmid transfection in e. coli, and I came across a post that mentioned DNA methylation as a possible problem. I had not dug into this before, and discovered that it is an entire field of study within biology. Before I realized how broad the topic was, I anticipated writing this blog post on DNA methylation; I then reduced its scope to only prokaryotes, though I will talk a little bit about how DNA methylation affects eukaryotic organi...