Regulation of Gene Expression
Gene regulation switches genes on and off, and so controls cell differentiation, and morphogenesis. Epigenetics is the study of inherited changes in phenotype (appearance) or gene expression. In eukaryotes, the expression of biologically active proteins can be modulated at several points like chromatin structure, initiation of transcription, post transcriptional processing, RNA transport, stability of mRNAs, initiation of translation, post translational processing, protein transport and stability. In prokaryotes, transcription initiation is the main point of control of gene expression. Prokaryotic genes are clustered into operons, each of which code for a corresponding protein.