Chromatin modification
Chromatin modification is a form of epigenetics. Epigenetics refers to changes in the expression of a gene or set of genes without changing the DNA sequence. Unlike mutations in DNA, which are mostly permanent, chromatin modifications can be reversed. Chromatin remodeling provides initial control of gene expression by regulating DNA accessibility to its transcription initiation apparatus. Chromatin modification can be achieved by:
Get the overview of gene regulation.