ABSTRACT

G ene expression is regulated at d ifferen t levels: transcrip tio n , translation and posttranslation (Fig 23.1).

Cells use different modes of translational control1 2 like phosphorylation of initiation factors, poly (A) tail shortening of the cyto­ plasmic messenger RNA, mRNA repression by mRNA binding proteins and desta­ bilization of messenger RNA by site specific endonucleases.