Repression

Repression
Switching off the expression of a gene or a group of genes in response to a chemical or other stimulus.

REPRESSION - Inhibition of transcription (or translation) by the binding of a repressor protein to a specific site on DNA (or mRNA).

The repression proteins break down the mRNA by
removing its "cap"
removing its poly(A) tail
degrading the remaining message (nibbling away in the 5' -> 3' direction) ...

Catabolite repression The repression by glucose of catabolic enzymes required for the catabolism of carbohydrates other than glucose.

The relief of repression for a gene or set of genes under negative control by a repressor.
2. Regarding temperate phages, the process causing a prophage to become virulent.
3.

For other uses, see repression
A repressor is a DNA-binding protein that regulates the expression of one or more genes by decreasing the rate of transcription. This blocking of expression is called repression.

But clearly we have examples where you have both activation and repression in this process. And that's common to all biological processes. The whole concept that you need both activation and repression is a common theme throughout biology.

Seventy-five different operons controlling 250 structural genes have been identified for E. coli. Both repression and induction are examples of negative control since the repressor proteins turn off transcription.

In interphase nucleus, these regions have a tendency to fuse, forming large chromocenters in a cell type-specific manner. Euchromatic regions can also associate with chromocenters that causes gene silencing as a result of transcription repression ...

X-inactivation -- the repression of one of the two X-chromosomes in the somatic cells of females as a method of dosage compensation; at an early embryonic stage in the normal female, one of the two X-chromosomes undergoes inactivation, ...

See also: Trans, Protein, Gene, Cell, Express