Deborah Vassar, Ernest Mueller, Savita Bagga. 2009
Epigenetics is often defined as the study of heritable changes that occur without a change in the actual DNA sequences. It has been shown that associated DNA proteins, called histones, are altered by methylation, phosphorylation, acetylation, and other changes. DNA chromatin structure is altered by these histone modifications as well as by direct methylation. These changes are in constant flux and can alter gene expression and related phenotypes; the actual DNA sequence, however, remains unchanged.
DNA methylation, the addition of a methyl group to the 5´ carbon of cytosine, is one of the main components of the epigenetic code and is thought to be involved in the repression of gene activity. It’s relationship to development and cancer has been extensively studied. Read more »






