regulatory gene

A regulator gene or regulatory gene is a gene involved in controlling the expression of one or more other genes. A regulator gene may encode a protein, or it may work at the level of RNA, as in the case of genes encoding microRNAs.In prokaryotes, regulator genes often codes for repressor proteins. Repressor proteins bind to operators or promoters, preventing RNA polymerase from transcribing RNA.  Inducers cause repressor proteins to change shape or otherwise become unable to bind DNA, allowing RNA polymerase to continue transcription.
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Regulator gene n. A gene that causes the production of a protein that represses the activity of another gene in an operon. [more]Regulatory gene - Community and Resources

Noun
1. a gene that produces a repressor substance that inhibits an operator gene
(synonym) regulator gene
(hypernym) gene, cistron, factor
(part-holonym) operon

A gene that regulates the expression of other genes. A regulatory gene is a nosy gene whose prime preoccupation is to horn in on other genes and control the rate at which they make products.