In recent years, doctors, researchers and the pharmaceutical industry have become increasingly interested in better understanding disease from an epigenomic perspective. The human genome is stable and consistent in every cell type -- the same balled up strands of DNA sequences are distributed throughout the entirety of the body.
Epigenomes, on the other hand, vary. They are a separate set of chemical instructions that govern access to DNA. In determining which parts of the DNA sequence get transcribed into proteins and where, epigenomes are integral to gene expression.