Saccharomyces cerevisiae
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ABSTRACT:
PROVIDER: PRJNA329129 | ENA |
REPOSITORIES: ENA
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Project description:Saccharomyces cerevisiae Translation Massively Parallel Reporter Assay raw reads
| PRJNA721222 | ENA
Project description:Data of gene expression levels across individuals, cell types, and disease states is rapidly expanding, yet we have limited understanding of how expression levels impact cellular and organismal phenotypes. Here, we present a massively parallel system for assaying the effect of gene expression levels on cellular fitness in Saccharomyces cerevisiae by systematically altering the expression level of each of ~100 endogenous genes at ~100 distinct expression levels spanning a 500-fold range at high resolution. Our results show that the relationship between expression levels and growth is gene- and environment-specific, with the specific relationship exhibited by each gene being highly informative on its function, stoichiometry within complexes, and interaction with other genes. Notably, in one of the two environmental conditions that we tested, we find that ~20% of the genes have expression levels where fitness is greater than that at wild-type expression levels, indicating that wild-type expression is not optimal for growth in that condition. We find that genes whose fitness is greatly affected by small changes in expression level tend to exhibit lower cell-to-cell variability in expression, suggesting that noise in gene expression is shaped in part by the relationship between expression and fitness. Overall, our study addresses a fundamental gap in our understanding of the functional significance of gene expression regulation and offers a powerful framework for evaluating the phenotypic effects of expression variation. 130 synthetic promoters were genomically integrated upstream of 96 endogenous yeast genes to span an expression range for each gene. Fitness as a function of the expression level of each gene was computed by a pooled growth competition assay.
2016-08-25 | E-GEOD-83936 | biostudies-arrayexpress
Project description:The Fitness Consequences of Aneuploidy Are Driven by Condition-Dependent Gene Effects
| PRJNA280885 | ENA
Project description:Data of gene expression levels across individuals, cell types, and disease states is rapidly expanding, yet we have limited understanding of how expression levels impact cellular and organismal phenotypes. Here, we present a massively parallel system for assaying the effect of gene expression levels on cellular fitness in Saccharomyces cerevisiae by systematically altering the expression level of each of ~100 endogenous genes at ~100 distinct expression levels spanning a 500-fold range at high resolution. Our results show that the relationship between expression levels and growth is gene- and environment-specific, with the specific relationship exhibited by each gene being highly informative on its function, stoichiometry within complexes, and interaction with other genes. Notably, in one of the two environmental conditions that we tested, we find that ~20% of the genes have expression levels where fitness is greater than that at wild-type expression levels, indicating that wild-type expression is not optimal for growth in that condition. We find that genes whose fitness is greatly affected by small changes in expression level tend to exhibit lower cell-to-cell variability in expression, suggesting that noise in gene expression is shaped in part by the relationship between expression and fitness. Overall, our study addresses a fundamental gap in our understanding of the functional significance of gene expression regulation and offers a powerful framework for evaluating the phenotypic effects of expression variation.
2016-08-25 | GSE83936 | GEO
Project description:Background: Recent studies have demonstrated that antisense transcription is pervasive in budding yeasts and is conserved between Saccharomyces cerevisiae and S. paradoxus. While studies have examined antisense transcripts of S. cerevisiae for inverse transcription in stationary phase and stress conditions, there is a lack of comprehensive analysis of the conditional specific evolutionary characteristics of antisense transcription between yeasts. Here we attempt to decipher the evolutionary relationship of antisense transcription of S. cerevisiae and S. paradoxus cultured in mid log, early stationary phase, and heat shock conditions. Results: Massively parallel sequencing of sequence strand-specific cDNA library was performed from RNA isolated from S. cerevisiae and S. paradoxus cells at mid log, stationary phase and heat shock conditions. We performed this analysis using a stringent set of sense ORF transcripts and non-coding antisense transcripts that were expressed in all the three conditions, as well as in both species. We found the divergence of the condition specific anti-sense transcription levels is higher than that in condition specific sense transcription levels, suggesting that antisense transcription played a potential role in adapting to different conditions. Furthermore, 43% of sense-antisense pairs demonstrated inverse transcription in either stationary phase or heat shock conditions relative to the mid log conditions. In addition, a large part of sense-antisense pairs (67%), which demonstrated inverse transcription, were highly conserved between the two species. Our results were also concordant with known functional analyses from previous studies and with the evidence from mechanistic experiments of role of individual genes. Conclusions: This study provides a comprehensive picture of the role of antisense transcription mediating sense transcription in different conditions across yeast species. We can conclude from our findings that antisense regulation could act like an on-off switch on sense regulation in different conditions.
2014-06-09 | GSE58319 | GEO
Project description:Systematic investigation of transcription factor activity in the context of chromatin using massively parallel DNA binding and expression assays
| PRJNA357133 | ENA
Project description:Transcription start site (TSS) selection is a key step in gene expression and occurs at many promoter positions over a wide range of efficiencies. Here, we develop a massively parallel reporter assay to quantitatively dissect contributions of promoter sequence, NTP substrate levels, and RNA polymerase II (Pol II) activity to TSS selection by "promoter scanning" in Saccharomyces cerevisiae (Pol II MAssively Systematic Transcript End Readout, "Pol II MASTER"). Using Pol II MASTER, we measure the efficiency of Pol II initiation at 1,000,000 individual TSS sequences in a defined promoter context. Pol II MASTER confirms proposed critical qualities of S. cerevisiae TSS -8, -1, and +1 positions quantitatively in a controlled promoter context. Pol II MASTER extends quantitative analysis to surrounding sequences and determines that they tune initiation over a wide range of efficiencies. These results enabled the development of a predictive model for initiation efficiency based on sequence. We show that genetic perturbation of Pol II catalytic activity alters initiation efficiency mostly independently of TSS sequence, but selectively modulates preference for initiating nucleotide. Intriguingly, we find that Pol II initiation efficiency is directly sensitive to GTP levels at the first five transcript positions and to CTP and UTP levels at the second position genome wide. These results suggest individual NTP levels can have transcript-specific effects on initiation, representing a cryptic layer of potential regulation at the level of Pol II biochemical properties. The results establish Pol II MASTER as a method for quantitative dissection of transcription initiation in eukaryotes.
2023-11-26 | GSE185290 | GEO
Project description:The effects of cis-regulatory mutations in SUL1 on yeast sulfate-limited fitness
| PRJNA273419 | ENA
Project description:The N-terminal tail of histone H2A shows evolutionary changes that parallel genome size and aid chromatin compaction. As genome size increases, so does the number of arginines. In contrast, serines corellate with small genomes. Examples for such changes are arginine in position 11 and serine in position 15. To test if these residues affect mRNA levels, we analysed gene expression profiles of S.cerevisiae strains containing either WT or mutant H2A.
2014-03-01 | GSE50440 | GEO