Controlling gene expression in yeast by inducible site-specific recombination

Nucleic Acids Res. 2000 Dec 15;28(24):E108. doi: 10.1093/nar/28.24.e108.


An intron module was developed for Saccharomyces cerevisiae that imparts conditional gene regulation. The kanMX marker, flanked by loxP sites for the Cre recombinase, was embedded within the ACT1 intron and the resulting module was targeted to specific genes by PCR-mediated gene disruption. Initially, recipient genes were inactivated because the loxP-kanMX-loxP cassette prevented formation of mature transcripts. However, expression was restored by Cre-mediated site-specific recombination, which excised the loxP-kanMX-loxP cassette to generate a functional intron that contained a single loxP site. Cre recombinase activity was controlled at the transcriptional level by a GAL1::CRE expression vector or at the enzymatic level by fusing the protein to the hormone-dependent regulatory domain of the estrogen receptor. Negative selection against leaky pre-excision events was achieved by growing cells in modified minimal media that contained geneticin (G418). Advantages of this gene regulation technique, which we term the conditional knock-out approach, are that (i) modified genes are completely inactivated prior to induction, (ii) modified genes are induced rapidly to expression levels that compare to their unmodified counterparts, and (iii) it is easy to use and generally applicable.

MeSH terms

  • Attachment Sites, Microbiological / genetics
  • Culture Media
  • DNA, Fungal / genetics
  • DNA, Fungal / metabolism
  • DNA, Recombinant / genetics
  • DNA, Recombinant / metabolism
  • Enzyme Induction
  • Fungal Proteins / genetics
  • Fungal Proteins / physiology
  • Gene Expression Regulation, Fungal*
  • Gene Silencing
  • Genes, Fungal / genetics
  • Gentamicins / pharmacology
  • Humans
  • Integrases / biosynthesis
  • Integrases / genetics
  • Integrases / metabolism*
  • Introns / genetics
  • Kinetics
  • Mutagenesis, Site-Directed / genetics*
  • RNA, Fungal / genetics
  • RNA, Fungal / metabolism
  • Receptors, Estrogen / genetics
  • Recombination, Genetic / genetics*
  • Reproducibility of Results
  • Saccharomyces cerevisiae / drug effects
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae / growth & development
  • Sequence Deletion / genetics*
  • Sequence Homology, Nucleic Acid
  • Silent Information Regulator Proteins, Saccharomyces cerevisiae*
  • Templates, Genetic
  • Trans-Activators / genetics
  • Trans-Activators / physiology
  • Viral Proteins*


  • Culture Media
  • DNA, Fungal
  • DNA, Recombinant
  • Fungal Proteins
  • Gentamicins
  • RNA, Fungal
  • Receptors, Estrogen
  • SIR3 protein, S cerevisiae
  • Silent Information Regulator Proteins, Saccharomyces cerevisiae
  • Trans-Activators
  • Viral Proteins
  • antibiotic G 418
  • Cre recombinase
  • Integrases