The lac operator-repressor system is functional in the mouse.
We report the successful transfer of a fully functional lac operator-repressor gene regulatory system to the mouse. The key component is a lac repressor transgene that resembles a typical mammalian gene both in codon usage and structure and expresses functional levels of repressor protein in the animal. We used the repressor to regulate the expression of a mammalian reporter gene consisting of the tyrosinase promoter embedded with three short lac operator sequences and the tyrosinase coding sequence. Pigmentation of the mouse was controlled by the interaction of the lac repressor with the regulatable Tyrosinase transgene in a manner that was fully reversible by the lactose analog IPTG. Direct control of mammalian promoters by the lac repressor provides tight, reversible regulation, predictable levels of de-repressed expression, and the promise of reversible control of the endogenous genome.
Cronin
C A
CA
Department of Neuroscience, University of Virginia, Charlottesville, VA 22908, USA.
Gluba
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W
Scrable
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H
D000818:Animals; D001426:Bacterial Proteins; D002460:Cell Line; D018899:CpG Islands; D029968:Escherichia coli Proteins; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D007544:Isopropyl Thiogalactoside / Q000494:pharmacology; D007763:Lac Operon; D056968:Lac Repressors; D051379:Mice; D008822:Mice, Transgenic; D014442:Monophenol Monooxygenase / Q000235:genetics*; D009875:Operator Regions, Genetic; D014176:Protein Biosynthesis; D012326:RNA Splicing; D051381:Rats; D012097:Repressor Proteins; D014158:Transcription, Genetic
D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D056968:Lac Repressors; D012097:Repressor Proteins; D007544:Isopropyl Thiogalactoside; D014442:Monophenol Monooxygenase