So too with poo. A poo can take on a variety of appearances and still be considered normal. It can be all manner of shades â from orangey and dark brown to magenta or green from certain veggies or blue from artificially-colored foods and beverages.
Epigenetics is the study of changes in gene activity which are not caused by changes in the DNA sequence. It is the study of gene expression, the way genes bring about their phenotypic effects. These changes in gene activity may stay for the remainder of the cell's life and may also last for many generations of cells, through cell divisions.
Epigenomics is the study of the complete set of epigenetic modifications on the genetic material of a cell, known as the epigenome.The field is analogous to genomics and proteomics, which are the study of the genome and proteome of a cell (Russell 2010 p. 217 & 230).Epigenetic modifications are reversible modifications on a cellâs DNA or histones that affect gene expression without altering the DNA sequence (Russell 2010 p. 475).Two of the most characterized epigenetic modifications are DNA methylation and histone modification.Epigenetic modifications play an important role in gene expression and regulation, and are involved in numerous cellular processes such as in differentiation/development and tumorigenesis (Russell 2010 p. 597).wo of the most characterized epigenetic modifications are DNA methylation and histone modification. Epigenetic modifications play an important role in gene expression and regulation, and are involved in numerous cellular processes such as in differentiation/development and tumorigenesis (Russell 2010 p. 597).