CTN1, Ras family guanine nucleotide exchange factor CDC25, CDC25', L000000264, L000000263, YLR310C
Membrane bound guanine nucleotide exchange factor; indirectly regulates adenylate cyclase through activation of Ras1p and Ras2p by stimulating the exchange of GDP for GTP; required for progression through G1; a membrane bound guanine nucleotide exchange factor is also known as a GEF or GDP-release factor
Saccharomyces cerevisiae (S288c)


L000004864, YML006C
CAAX box containing protein of unknown function; proposed to be involved in the RAS/cAMP signaling pathway
GO Process (2)
GO Function (0)
GO Component (1)

Gene Ontology Cellular Component

Saccharomyces cerevisiae (S288c)

Dosage Lethality

A genetic interaction is inferred when over expression or increased dosage of one gene causes lethality in a strain that is mutated or deleted for another gene.


Yeast genes GIS1-4: multicopy suppressors of the Gal- phenotype of snf1 mig1 srb8/10/11 cells.

Balciunas D, Ronne H

Cyclin C and the cyclin C-dependent protein kinase are associated with the RNA polymerase II Mediator complex, which regulates initiation of transcription in response to signals from activators and repressors bound to upstream promoter elements. Disruption of the corresponding genes, SRB11 and SRB10, in budding yeast causes a reduction in expression of the GAL genes, which is particularly pronounced in ... [more]

Mol. Gen. Genet. Dec. 01, 1999; 262(4);589-99 [Pubmed: 10628841]


  • Low Throughput

Ontology Terms

  • phenotype: utilization of carbon source (APO:0000098)
  • phenotype: inviable (APO:0000112)

Additional Notes

  • overexpression of Gis2 or Gis4 causes a synthetic growth defect on lactate medium in a cdc25 mutant

Curated By

  • BioGRID