regulator gene

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In the operon theory of gene regulation, a gene that is involved in switching on or off the transcription of structural genes. When transcribed, the regulator gene produces a repressor protein, which switches off an operator gene and hence the operon that this controls. The regulator gene is not part of the operon, and may even be on a different chromosome. See also repressor.

Subjects: Genetics and Genomics.

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