Cell cycle gene expression control
Ontology highlight
ABSTRACT:
ORGANISM(S): Saccharomyces cerevisiae
PROVIDER: GSE13232 | GEO | 2015/05/01
SECONDARY ACCESSION(S): PRJNA162639
REPOSITORIES: GEO
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Project description:Gene expression data for cdc28-13 yeast released synchronously into the cell cycle. cdc28-13 yeast were arrested in G1 for 3 hours at 37 degrees. Cells were rapidly cooled to 25 C by mixing with an equal volume of media at 13 C, and time points were taken every 10 minutes. Cells were rapidly pelleted, and mRNA was isolated and hybridized against midlog mRNA.
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Project description:The translational efficiency of mRNAs in cells progressing synchronously through the mitotic cell cycle and having to meet their growth requirements for cell division has not been interrogated. Here, we used ribosome profiling of a cell-size series from the time of cell birth, to identify for the first time yeast mRNAs under periodic translational control. Late in the cell cycle, there was coordinate translational activation of mRNAs encoding lipid biosynthesis enzymes. An upstream open reading frame (uORF) mediates the translational control of ACC1, the mRNA encoding the rate-limiting enzyme acetyl-CoA carboxylase. The ACC1 uORF also adjusts Acc1p protein levels in different nutrients. Mutating the ACC1 uORF delayed cell cycle progression, reduced cell size and suppressed the replicative longevity of cells lacking the Sch9p protein kinase, the yeast S6 kinase ortholog. These findings reveal unexpected links between lipogenesis and protein synthesis in mitotic cell divisions
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Project description:The translational efficiency of mRNAs of cells progressing synchronously through the mitotic cell cycle has been interrogated by ribosome profiling.
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Project description:Yeast cell cycle transcription dynamics in two S. cerevisae strains: BF264-15DU (MATa ade1 his2 leu2-3, 112 trp1-1 ura3Dns, bar1) [referred to as wild type] and a mutant of the wild type strain, clb1,2,3,4,5,6 GAL1-CLB1, [referred to as cyclin mutant] that does not express S-phase and mitotic cyclins. Both strains were synchronized by elutriation and released into YEP 2% dextrose/1M sorbitol at 30c. 15 samples were taken at 16 min intervals covering ~2 cycles in wild-type and ~1.5 cycles for the mutants. A significant fraction of the Saccharomyces cerevisiae genome is transcribed periodically during the cell division cycle, suggesting that properly timed gene expression is important for regulating cell cycle events. Genomic analyses of transcription factor localization and expression dynamics suggest that a network of sequentially expressed transcription factors could control the temporal program of transcription during the cell cycle. However, directed studies interrogating small numbers of genes indicate that their periodic transcription is governed by the activity of cyclin-dependent kinases (CDKs). To determine the extent to which the global cell cycle transcription program is controlled by cyclin/CDK complexes, we compared genome-wide transcription dynamics in wild type budding yeast to mutants that do not express S-phase and mitotic cyclins. Keywords: cell cycle, strain comparison
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Project description:Acetylation of histone H3 lysine 56 is a covalent modification best-known as a mark of newly-replicated chromatin, but has also been linked to replication-independent histone replacement. Here, we measured H3K56ac levels at single-nucleosome resolution in asynchronously growing yeast cultures, as well as in yeast proceeding synchronously through the cell cycle. We developed a quantitative model of H3K56ac kinetics, which shows that H3K56ac is largely explained by the genomic replication timing and the turnover rate of each nucleosome, suggesting that cell cycle profiles of H3K56ac should reveal most first-time nucleosome incorporation events. However, since the deacetylases Hst3/4 prevent use of H3K56ac as a marker for histone deposition during M phase, we also directly measured M phase histone replacement rates. We report a global decrease in turnover rates during M phase, and a further specific decrease in turnover among early origins of replication, which switch from rapidly-replaced in G1 phase to stable-bound during M phase. Finally, by measuring H3 replacement in yeast deleted for the H3K56 acetyltransferase Rtt109 and its two co-chaperones Asf1 and Vps75, we find evidence that Rtt109 and Asf1 preferentially enhance histone replacement at rapidly-replaced nucleosomes, whereas Vps75 appears to inhibit histone turnover at those loci. These results provide a broad perspective on histone replacement/incorporation throughout the cell cycle, and suggest that H3K56 acetylation provides a positive feedback loop by which replacement of a nucleosome enhances subsequent replacement at the same location.
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Project description:The PAT-seq approach was utilised to determine the gene expression changes over the cell-cycle of wildtype and delta-set1 yeast strains. The cell were synchronised by alpha-factor arrest and cell-cycle release
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