The AML-associated K313 mutation enhances C/EBPα activity by increasing translation via release of ribosome stalling
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA493112 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Mutations in the transcription factor C/EBPα are found in about 10% of all acute myeloid leukaemia (AML) cases but the contribution of these mutations to leukaemogenesis is incompletely understood. We here use a mouse model of granulocyte progenitors expressing conditionally active HoxB8 to assess the cell biological and molecular activity of C/EBPα-mutations associated with human AML.
2020-05-05 | GSE120473 | GEO
Project description:In higher eukaryotes, the large numbers of nuclear-encoded tRNA genes partially ensure the robustness of cytoplasmic protein translation. Here we discover that a loss-of-function in n-Tr20, a member of the nuclear-encoded tRNA Arg UCU family that is expressed specifically in the central nervous systems leads to low but detectable levels of ribosome stalling. In the absence of GTPBP2, a novel binding partner of the ribosome recycling protein Pelota, ribosome stalling increases, leading to widespread neurodegeneration. Our results not only define GTPBP2 as a ribosome rescue factor, but also unmask the disease potential of mutations in nuclear-encoded tRNA genes. In this submission we provide ribosome footprinting data from the cerebella of four strains derived from the C57BL/6J strain with combinations of n-Tr20 and GTPBP2 mutations. Examination of ribosome stalling in cerebella from 4 mouse strains derived from the: C57BL/6J (B6J) strain. The nmf205-/- strain has a homozygous mutation in the gene GTPBP2 while the B6J strain has normal GTPBP2. The n-Tr20 J/J strain has a defect in the n-Tr20 tRNA while the n-Tr20 N/N strain has a functional n-Tr20 tRNA. The 4 strains are the 2x2 combinations of these defects and correctly functioning sequences. 2 replicates for each strain. Please note that only BAM files are included in the records since they form the basis of the study's conclusions. The raw data ribosomal RNA have been filtered and then unique reads mapping to mm10 were computed using tophat and igenome annotations.
2014-07-28 | E-GEOD-56127 | biostudies-arrayexpress
Project description:In higher eukaryotes, the large numbers of nuclear-encoded tRNA genes partially ensure the robustness of cytoplasmic protein translation. Here we discover that a loss-of-function in n-Tr20, a member of the nuclear-encoded tRNA Arg UCU family that is expressed specifically in the central nervous systems leads to low but detectable levels of ribosome stalling. In the absence of GTPBP2, a novel binding partner of the ribosome recycling protein Pelota, ribosome stalling increases, leading to widespread neurodegeneration. Our results not only define GTPBP2 as a ribosome rescue factor, but also unmask the disease potential of mutations in nuclear-encoded tRNA genes. In this submission we provide ribosome footprinting data from the cerebella of four strains derived from the C57BL/6J strain with combinations of n-Tr20 and GTPBP2 mutations.
2014-07-28 | GSE56127 | GEO
Project description:In bacteria, translation-transcription coupling inhibits RNA polymerase (RNAP) stalling. We present evidence suggesting that, upon amino acid starvation, inactive ribosomes promote rather than inhibit RNAP stalling. We developed an algorithm to evaluate genome-wide polymerase progression independently of local noise, and used it to reveal that the transcription factor DksA inhibits promoter-proximal pausing and increases RNAP elongation when uncoupled from translation by depletion of charged tRNAs. DksA has minimal effect on RNAP elongation in vitro and on untranslated RNAs in vivo. In these cases, transcripts can form RNA structures that prevent backtracking. Thus, the effect of DksA on transcript elongation may occur primarily upon ribosome slowing/stalling or at promoter-proximal locations that limit the potential for RNA structure. We propose that inactive ribosomes prevent formation of backtrackblocking mRNA structures and that, in this circumstance, DksA acts as a transcription elongation factor in vivo. Chromatin immunoprecipitation (ChIP) experiments were performed by using antibodies against RNA polymerase b subunit in wild-type and DdksA cells treated with 0.5mg/ml serine hydroxamate (SHX) or untreated. DksA and s70 enrichments were compared to RNAP enrichment by ChIP experiments using antibodies against s70 and DksA in wild-type cells (also in DdksA cells as a negative control for DksA ChIP-chip). Differentially labeled ChIP DNA and genomic DNA were competitively hybridized to an E. coli K-12 MG1655 tiling array with overlapping probes at ~12bp spacing across the entire genome. The series contains 19 datasets.
2014-04-21 | E-GEOD-54669 | biostudies-arrayexpress
Project description:We use ribosome profiling to demonstrate the selectivity of a small molecule, PF-06446846 that inhibits translation of its target by selectively inducing ribosome-stalling in a nascent chain sequence dependent manner.
2017-06-05 | GSE94454 | GEO
Project description:In bacteria, translation-transcription coupling inhibits RNA polymerase (RNAP) stalling. We present evidence suggesting that, upon amino acid starvation, inactive ribosomes promote rather than inhibit RNAP stalling. We developed an algorithm to evaluate genome-wide polymerase progression independently of local noise, and used it to reveal that the transcription factor DksA inhibits promoter-proximal pausing and increases RNAP elongation when uncoupled from translation by depletion of charged tRNAs. DksA has minimal effect on RNAP elongation in vitro and on untranslated RNAs in vivo. In these cases, transcripts can form RNA structures that prevent backtracking. Thus, the effect of DksA on transcript elongation may occur primarily upon ribosome slowing/stalling or at promoter-proximal locations that limit the potential for RNA structure. We propose that inactive ribosomes prevent formation of backtrackblocking mRNA structures and that, in this circumstance, DksA acts as a transcription elongation factor in vivo.
2014-04-21 | GSE54669 | GEO
Project description:Translation initiation at alternative start sites can dynamically control the synthesis of two or more functionally distinct protein isoforms from a single mRNA. Alternate isoforms of the hematopoietic transcription factor C/EBPα produced from different start sites exert opposing effects during myeloid cell development. This alternative initiation depends on sequence features of the CEBPA transcript, including a regulatory upstream open reading frame (uORF), but the molecular basis is not fully understood. Here we identify trans-acting factors that affect C/EBPα isoform choice using a sensitive and quantitative two-color fluorescence reporter coupled with CRISPRi screening. Our screen uncovered a role for the ribosome rescue factor PELOTA (PELO) in promoting expression of the longer C/EBPα isoform, by directly removing inhibitory unrecycled ribosomes and through indirect effects mediated by the mechanistic target of rapamycin (mTOR) kinase. Our work provides further mechanistic insights into coupling between ribosome recycling and translation reinitiation in regulation of a key transcription factor, with implications for normal hematopoiesis and leukemiagenesis.
2023-03-08 | GSE226435 | GEO
Project description:Translation initiation at alternative start sites can dynamically control the synthesis of two or more functionally distinct protein isoforms from a single mRNA. Alternate isoforms of the hematopoietic transcription factor C/EBPα produced from different start sites exert opposing effects during myeloid cell development. This alternative initiation depends on sequence features of the CEBPA transcript, including a regulatory upstream open reading frame (uORF), but the molecular basis is not fully understood. Here we identify trans-acting factors that affect C/EBPα isoform choice using a sensitive and quantitative two-color fluorescence reporter coupled with CRISPRi screening. Our screen uncovered a role for the ribosome rescue factor PELOTA (PELO) in promoting expression of the longer C/EBPα isoform, by directly removing inhibitory unrecycled ribosomes and through indirect effects mediated by the mechanistic target of rapamycin (mTOR) kinase. Our work provides further mechanistic insights into coupling between ribosome recycling and translation reinitiation in regulation of a key transcription factor, with implications for normal hematopoiesis and leukemiagenesis.
2023-03-08 | GSE226436 | GEO
Project description:Stalling of the ribosomes on the mRNA has been linked to myriad of molecular and biological functions. While a multitude of algorithms predict codon-usage in ribosome profiling data, no tool exists to predict the context-specific stalling of ribosomes on transcripts. Combining these two features can reveal unprecedented insights in the ribosomal function and their usage across cells and conditions. To overcome this lack of tools to comprehensively analyze these features, we created Bumpfinder, a web-server, that provides comprehensive analytical details on differences in total ribosome occupancy on transcripts, ribosomal occupancy across codons, ribosome-stalling and the underlying causal amino-acids/codons, as well as collisions. Employing Bumpfinder on generated and publicly available ribosome-profiling datasets, we studied the response of various cell types to amino-acid starvation conditions. We observed interesting patterns in response to the biological effects, suggesting the impact of quality control mechanisms of protein synthesis. Complimentary analysis of collided ribosomes demonstrated phased ribosome stalling on the identified sites. Thus, by deciphering context-specific ribosome distribution, Bumpfinder provides unprecedented molecular insights in the ribosome function and mRNA translation during stress response conditions.
2023-12-31 | GSE156443 | GEO
Project description:Protein synthesis is performed by the ribosome and a host of highly conserved elongation factors. Elongation factor P (EF-P) prevents ribosome stalling at difficult-to-translate sequences, particularly polyproline tracts. In bacteria, phenotypes associated with efp deletion range from modest to lethal, suggesting that some species encode an additional translation factor that has similar function to EF-P. Here we identify YfmR as a translation factor that is essential in the absence of EF-P in B. subtilis. YfmR is an ABCF ATPase that is closely related to both Uup and EttA, ABCFs that bind the ribosomal E-site and are conserved in more than 50% of bacterial genomes. We show that YfmR associates with actively translating ribosomes, and that depleting YfmR from ∆efp cells causes severe ribosome stalling at a polyproline tract in vivo. YfmR depletion from ∆efp cells was lethal, and caused reduced levels of actively translating ribosomes. Our results therefore identify YfmR as an important translation factor that is essential in B. subtilis in the absence of EF-P.
2024-03-06 | GSE249203 | GEO