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see nucleic acidnucleic acid,
any of a group of organic substances found in the chromosomes of living cells and viruses that play a central role in the storage and replication of hereditary information and in the expression of this information through protein synthesis.
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a special regulating protein formed in bacterial cells that halts transcription, which is the synthesis of messenger ribonucleic acid (m-RNA) from a specific operon (a group of genes that carry out the synthesis of functionally related enzymes). The number of different repressors corresponds to the number of operons.

Unlike other proteins, a repressor present in a cell consists of ten to 20 molecules. The synthesis of m-RNA ceases when a repressor combines with an operator, which is the regulating part of an operon. An effector, for example, lactose in a lactose operon, interacts with a repressor to form a complex that inactivates and produces a reversible spatial change in a repressor molecule. This type of repressor can no longer combine with an operator and, as a result, m-RNA synthesis resumes.


An end product of metabolism which represses the synthesis of enzymes in the metabolic pathway.
The product of a regulator gene that acts to repress the transcription of another gene.
References in periodicals archive ?
1) which predicts that plants flower when the vegetative gene repression of an autonomous or "automatic" flowering program is turned off (Koornneef et al.
Methylation and chromatin structure are common epigentic regulators of stable gene repression and likely contributors in the control of Cent1 expression.
NFKB1 gene, central mediator of the proinflammatory immune response was expressed at significantly reduced levels in PMBC of BTB-infected animals and was hypothesized as key mediator of the gene repression detected in BTB infected group (24).