title: Meiotic differentiation during colony maturation in Saccharomyces cerevisiae.
abstract: As yeast colonies ceased growth, cells at the edge of these colonies transited from the cell division cycle into meiosis at high efficiency. This transition occurred remarkably synchronously and only at late stages of colony maturation. The transition occurred on medium containing acetate or low concentrations of glucose, but not on medium containing high glucose. The repression by high glucose was overcome when IME1 was overexpressed from a plasmid. Experiments with different growth media imply that meiosis in colonies is triggered by changes in the nutrient environment as colonies mature. HAP2 is required to sporulate in any carbon source, whereas GRR1 is required for glucose repression of sporulation. CLN3 is required to repress meiosis in colonies but not in liquid cultures, indicating that the regulators that mediate the transition to meiosis in colonies are not identical to the regulators that mediate this transition in liquid cultures.
authors.affiliation: Division of Cell Biology and Biophysics, School of Biological Sciences, University of Missouri-Kansas City, 5007 Rockhill Rd, 64110-2499, USA.
authors.forename: Kedar
authors.initials: K
authors.lastname: Purnapatre
authors.forename: Saul M
authors.initials: SM
authors.lastname: Honigberg
mesh_terms: D000645:Ammonium Sulfate / Q000378:metabolism; D023081:CCAAT-Binding Factor / Q000378:metabolism; D002352:Carrier Proteins / Q000378:metabolism; D002454:Cell Differentiation / Q000502:physiology; D016213:Cyclins / Q000378:metabolism; D044783:F-Box Proteins; D005656:Fungal Proteins / Q000378:metabolism; D005809:Genes, Regulator; D005947:Glucose / Q000378:metabolism; D006238:Haploidy; D008540:Meiosis / Q000502:physiology*; D009154:Mutation; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000166:cytology* / Q000254:growth & development / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism; D044767:Ubiquitin-Protein Ligases
chemical_list: D023081:CCAAT-Binding Factor; C079895:CLN3 protein, S cerevisiae; D002352:Carrier Proteins; D016213:Cyclins; D044783:F-Box Proteins; D005656:Fungal Proteins; D029701:Saccharomyces cerevisiae Proteins; C071032:GRR1 protein, S cerevisiae; D044767:Ubiquitin-Protein Ligases; C071570:SNF1-related protein kinases; D017346:Protein Serine-Threonine Kinases; D005947:Glucose; D000645:Ammonium Sulfate