derepress

tr.v., -pressed, -press·ing, -press·es.
To induce the operation of (a gene) by deactivating the repressor.

derepression de're·pres'sion (-prĕsh'ən) n.

(dē'rĭ-prĕsh'ən)
n.

The activation of an operator gene by the deactivation of a repressor gene.

de're·press' (-prĕs') v.

1. elevation of the level of an enzyme above the normal, either by lowering the corepressor concentration or by a mutation that decreases the formation of aporepressor or the response to the complete repressor.
2. the inhibition of the repressor substance produced by the regulator genes with the result that the operator gene is free to initiate the process of polypeptide formation.