1-1.6 Control of gene expression:
Fig1-1.6: Points of control of gene expression
The eukaryotic gene expressions in a cell are controlled at about six stages as shown in the figure 1-1.6.
- Transcriptional control decides when and how frequently a given gene be transcribed. It enables the cell to check any discrepancy in the quantity of transcriptomes generated.
- RNA processing regulates how the RNA transcript is spliced or otherwise processed. (applicable only to eukaryotes), which have split genes consisting of exons and introns.
- Translational control decides which mRNAs in the cytoplasm are to be translated by ribosomes.
- mRNA degradation control selectively destabilize some mRNA molecules in the cytoplasm.
- Protein activity control selectively activates, inactivates, degrades, or compartmentalizes specific protein molecules after they have been synthesized. (applicable only to eukaryotes)