Definition of Epigenetics

Epigenetics: 1. The study of heritable changes in gene function that occur without a change in the sequence of the DNA. For example:

• The process of DNA methylation; and
• The process of chromatin remodeling.

2. The study of certain processes that occur in embryonic development. For example:

• X inactivation (the inactivation of one X chromosome in females); and
• The phenomenon of gene silencing.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=26386
Last Editorial Review: 6/14/2012