IME1, a positive regulator gene of meiosis in S. cerevisiae

Cell. 1988 Mar 25;52(6):853-62. doi: 10.1016/0092-8674(88)90427-8.


IME1 (Inducer of MEiosis) was cloned due to its high copy number effect: it enabled MAT insufficient strains to undergo meiosis. Disruption of IME1 results in a recessive Spo- phenotype. Diploids homozygous for the two mutations ime1-0, rme1-1 are also meiosis deficient. We conclude that IME1 is a positive regulator of meiosis that normally is repressed by RME1. RME1 is repressed by a complex of MATa1 and MAT alpha 2 gene products. IME1 is also regulated by the environment: no transcripts could be detected in glucose growing cells, in contrast to acetate growing cells. Starvation for nitrogen further induced (6- to 8-fold) transcription of IME1, but, as expected, the induction was found only in MATa/MAT alpha or rme1-1/rme1-1 diploids. Furthermore, the IME1 multicopy plasmids promoted sporulation in rich media.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Cloning, Molecular
  • Genes, Fungal*
  • Genes, Regulator*
  • Genetic Markers
  • Genotype
  • Meiosis
  • Plasmids
  • Saccharomyces cerevisiae / cytology
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae / growth & development
  • Transcription, Genetic*


  • Genetic Markers