Focus 

Methylation in biology

Methylation of DNA, RNA and proteins (notably histones) is one of the most ubiquitous and dynamic chemical modifications in eukaryotes, and has great impact on gene expression and protein function. The importance of methylation is evidenced by the diseases associated with its dysregulation, including cancer and immunological and neurological disorders. The Reviews in this focus issue showcase the latest understanding of the mechanisms and roles of methylation in animals and its clinical relevance.

Reviews & Comment