Gcn4 binding in coding regions can activate internal and canonical 5’ promoters in yeast [ChIP-seq]
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ABSTRACT:
PROVIDER: PRJNA420488 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR6333840_1.fastq.gz | Fastqsanger.gz | |||
| SRR6333840_2.fastq.gz | Fastqsanger.gz | |||
| SRR6333850_1.fastq.gz | Fastqsanger.gz | |||
| SRR6333850_2.fastq.gz | Fastqsanger.gz | |||
| SRR6333860_1.fastq.gz | Fastqsanger.gz |
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Project description:Gcn4 is a yeast transcriptional activator induced by amino acid starvation. ChIP-seq analysis revealed 546 genomic sites occupied by Gcn4 in starved cells, representing ~30% of all Gcn4 binding-motifs. Deviation from the consensus motif and nucleosome occupancy are key negative determinants of Gcn4 binding. Surprisingly, only ~40% of the bound sites are in promoter regions, and only ~50-67% of these activate transcription, indicating extensive negative control over Gcn4 function. Most of the remaining ~300 Gcn4-bound sites are within coding sequences (CDS), with ~75 representing the only bound sites near Gcn4-induced genes. Many such unconventional sites map between divergent antisense and sub-genic sense transcripts induced within CDS, adjacent to induced TBP peaks—consistent with Gcn4 activation of cryptic, bidirectional internal promoters. Mutational analysis confirms that Gcn4 sites within CDS can activate sub-genic and full-length transcripts from the same or adjacent genes, showing that functional Gcn4 binding is not confined to promoters.
2018-03-23 | GSE107532 | GEO
Project description:Gcn4 is a yeast transcriptional activator induced by amino acid starvation. ChIP-seq analysis revealed 546 genomic sites occupied by Gcn4 in starved cells, representing ~30% of all Gcn4 binding-motifs. Deviation from the consensus motif and nucleosome occupancy are key negative determinants of Gcn4 binding. Surprisingly, only ~40% of the bound sites are in promoter regions, and only ~50-67% of these activate transcription, indicating extensive negative control over Gcn4 function. Most of the remaining ~300 Gcn4-bound sites are within coding sequences (CDS), with ~75 representing the only bound sites near Gcn4-induced genes. Many such unconventional sites map between divergent antisense and sub-genic sense transcripts induced within CDS, adjacent to induced TBP peaks—consistent with Gcn4 activation of cryptic, bidirectional internal promoters. Mutational analysis confirms that Gcn4 sites within CDS can activate sub-genic and full-length transcripts from the same or adjacent genes, showing that functional Gcn4 binding is not confined to promoters.
2018-02-26 | GSE110413 | GEO
Project description:Gcn4 binding in coding regions can activate internal and canonical 5’ promoters in yeast [RNA-seq]
| PRJNA433659 | ENA
Project description:Gcn4 is a yeast transcriptional activator induced by amino acid starvation. ChIP-seq analysis revealed 546 genomic sites occupied by Gcn4 in starved cells, representing ∼30% of Gcn4-binding motifs. Surprisingly, only ∼40% of the bound sites are in promoters, of which only ∼60% activate transcription, indicating extensive negative control over Gcn4 function. Most of the remaining ∼300 Gcn4-bound sites are within coding sequences (CDSs), with ∼75 representing the only bound sites near Gcn4-induced genes. Many such unconventional sites map between divergent antisense and sub-genic sense transcripts induced within CDSs adjacent to induced TBP peaks, consistent with Gcn4 activation of cryptic bidirectional internal promoters. Mutational analysis confirms that Gcn4 sites within CDSs can activate sub-genic and full-length transcripts from the same or adjacent genes, showing that functional Gcn4 binding is not confined to promoters. Our results show that internal promoters can be regulated by an activator that functions at conventional 5'-positioned promoters.
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Project description:Deletion of several ribosomal proteins genes (RPKOs) has been shown to extend the lifespan of Saccharomyces cerevisiae in a Gcn4-dependent manner. To characterize the underlying mechanisms, we systematically analyzed the gene expression of both short- and long-lived RPKO strains at multiple levels. We found that up-regulation of amino acid biosynthesis and global down-regulation of protein synthesis are hallmarks of long-lived strains. We provide direct evidence that gene expression changes observed in long-lived strains result from translational up-regulation of GCN4 mRNA via skipping of upstream open reading frames (uORFs), in turn due to slow/defective ribosome assembly. We further demonstrate that Gcn4 acts as a transcriptional repressor on promoters of translation-related genes, thereby globally reducing protein synthesis. Our data suggest that the Gcn4-dependent increase in lifespan can be attributed partially to its ability to dampen the translation capacity of the cell, thereby engaging a well known mechanism of longevity.
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Project description:In Saccharomyces cerevisiae, deletion of genes encoding proteins of the large ribosomal subunit (RPLs) increases the replicative lifespan in a Gcn4-dependent manner. However, how Gcn4, a key transcriptional activator of amino acid biosynthesis genes, increases lifespan, is unknown. Here we show that Gcn4 acts as a repressor of protein synthesis. By analyzing the mRNA and protein abundance, the ribosome occupancy and protein synthesis rate in various yeast strains, we demonstrate that Gcn4 is sufficient to reduce protein synthesis and to increase yeast lifespan. Chromatin immunoprecipitation reveals Gcn4 binding not only at genes that are activated, but also at genes that are repressed upon Gcn4 overexpression. The promoters of repressed genes contain Rap1 binding motifs. Our data suggest that Gcn4 is a central regulator of protein synthesis under multiple perturbations - including ribosomal protein (RP) gene deletions, calorie restriction, rapamycin treatment - and provide an explanation for its role in longevity and stress response. This SuperSeries is composed of the SubSeries listed below.
2017-06-28 | GSE85591 | GEO
Project description:In Saccharomyces cerevisiae, deletion of genes encoding proteins of the large ribosomal subunit (RPLs) increases the replicative lifespan in a Gcn4-dependent manner. However, how Gcn4, a key transcriptional activator of amino acid biosynthesis genes, increases lifespan, is unknown. Here we show that Gcn4 acts as a repressor of protein synthesis. By analyzing the mRNA and protein abundance, the ribosome occupancy and protein synthesis rate in various yeast strains, we demonstrate that Gcn4 is sufficient to reduce protein synthesis and to increase yeast lifespan. Chromatin immunoprecipitation reveals Gcn4 binding not only at genes that are activated, but also at genes that are repressed upon Gcn4 overexpression. The promoters of repressed genes contain Rap1 binding motifs. Our data suggest that Gcn4 is a central regulator of protein synthesis under multiple perturbations - including ribosomal protein (RP) gene deletions, calorie restriction, rapamycin treatment - and provide an explanation for its role in longevity and stress response.
2017-06-28 | GSE85590 | GEO
Project description:In Saccharomyces cerevisiae, deletion of genes encoding proteins of the large ribosomal subunit (RPLs) increases the replicative lifespan in a Gcn4-dependent manner. However, how Gcn4, a key transcriptional activator of amino acid biosynthesis genes, increases lifespan, is unknown. Here we show that Gcn4 acts as a repressor of protein synthesis. By analyzing the mRNA and protein abundance, the ribosome occupancy and protein synthesis rate in various yeast strains, we demonstrate that Gcn4 is sufficient to reduce protein synthesis and to increase yeast lifespan. Chromatin immunoprecipitation reveals Gcn4 binding not only at genes that are activated, but also at genes that are repressed upon Gcn4 overexpression. The promoters of repressed genes contain Rap1 binding motifs. Our data suggest that Gcn4 is a central regulator of protein synthesis under multiple perturbations - including ribosomal protein (RP) gene deletions, calorie restriction, rapamycin treatment - and provide an explanation for its role in longevity and stress response.
2017-06-28 | GSE85588 | GEO
Project description:Since the early 1980s remarkable progress has been made in understanding the role of the HER2 locus in carcinogenesis, but many details of its regulatory network are still elusive. We recently reported the finding of 367 new human microRNA (miRNA) genes of which one, mir-4728, is encoded in an intron of the HER2 gene. Here, we confirm that the HER2 oncogene is a bi-functional locus encoding the membrane receptor and a functional miRNA gene. We further show that miR-4728-3p has alternative functionalities depending on the region used for interaction with its target; the canonical seed between nucleotides 2-8 or a novel, more internal seed shifted to nucleotides 6-12. Analysis of public data shows that this internal seed region, although rare compared to the far more abundant canonical 2-8 seed interaction, can also direct targeted down-regulation by other miRNAs. Through the internal seed, miR-4728-3p regulates expression of estrogen receptor alpha, an interaction that would have remained undetected if classic rules for miRNA-target interaction had been applied. In summary, we present here an alternative mode of miRNA regulation and demonstrate this dual function of the HER2 locus, linking the two major biomarkers in breast cancer. 6 samples treated with hsa-miR-4728-3p mimic and 6 samples treated with non-targeting control 4 samples treated with hsa-miR-1-3p mimic and 4 samples treated with non-targeting control
2014-08-13 | E-GEOD-55822 | biostudies-arrayexpress
Project description:The position of nucleosomes influences DNA accessibility to DNA-binding proteins. Genome-wide nucleosome profiles often report the observation of a canonical nucleosome organization at gene promoters where arrays of well-positioned nucleosomes emanate from nucleosome-depleted regions. It is unclear how this canonical promoter nucleosome organization forms and how it is related to transcription activation and the establishment of histone marks during development. Here we report the genome-wide organization of nucleosomes during zebrafish embryogenesis and show that well-positioned nucleosome arrays appear in thousands of promoters during the activation of the zygotic genome. The formation of canonical promoter nucleosome organization cannot be explained by DNA sequence preference, and is independent of transcription and the presence of RNA polymerase II, but strongly correlates with the presence of Histone H3 Lysine 4 trimethylation (H3K4me3). Our study further suggests that promoter nucleosome structure primes genes to future transcription activation. Together, this study reveals that genome activation but not transcription underlies the organization of nucleosome arrays during early embryogenesis. MNase-seq to generate nucleosome organization in two stages of zebrafish development; two biological replicates for each stage. 7 ChIP-seq experiments in three stages.
2013-10-18 | E-GEOD-44269 | biostudies-arrayexpress