Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

The hepatitis C viral protein NS5A stabilizes growth-regulatory human transcripts

ABSTRACT: Numerous mammalian proto-oncogene and other growth-regulatory transcripts are upregulated in malignancy due to abnormal mRNA stabilization. In hepatoma cells expressing a hepatitis C virus (HCV) subgenomic replicon, we found that the viral nonstructural protein 5A (NS5A), a protein known to bind to viral RNA, also bound specifically to human cellular transcripts that encode regulators of cell growth and apoptosis, and this binding correlated with transcript stabilization. An important subset of human NS5A-target transcripts contained GU-rich elements, sequences known to destabilize mRNA. We found that NS5A bound to GU-rich elements in vitro and in cells. Mutation of the NS5A zinc finger abrogated its GU-rich element-binding and mRNA stabilizing activities. Overall, we identified a molecular mechanism whereby HCV manipulates host gene expression by stabilizing host transcripts in a manner that would promote growth and prevent death of virus-infected cells, allowing the virus to establish chronic infection and lead to the development of hepatocellular carcinoma.

ORGANISM(S): Homo sapiens

PROVIDER: GSE102910 | GEO | 2017/11/01

SECONDARY ACCESSION(S): PRJNA399262

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Similar Datasets

Hepatitis C virus up-regulates B-cell receptor signaling: a novel mechanism for HCV-associated B-cell lymphoproliferative disorders

Project description:B-cell receptor (BCR) signaling is essential for the development of B-cells and plays a critical role in B-cell neoplasia. Increasing evidence indicates an association between chronic hepatitis C virus (HCV) infection and B-cell lymphoma, however, the mechanisms by which HCV causes B-cell lymphoproliferative disorder are still unclear. Herein, we demonstrate the expression of HCV viral proteins in B-cells of HCV-infected patients and show that HCV up-regulates BCR signaling in human primary B-cells. HCV nonstructural protein NS3/4A interacts with CHK2 and down-regulates its activity, modulating HuR posttranscriptional regulation of a network of target mRNAs associated with B-cell lymphoproliferative disorders. Interestingly, the BCR signaling pathway was found to have the largest number of transcripts with increased association with HuR and was up-regulated by NS3/4A. Our study reveals a previously unidentified role of NS3/4A in regulation of host BCR signaling during HCV infection, contributing to a better understanding of the molecular mechanisms underlying HCV-associated B-cell lymphoproliferative disorders.

2015-10-14 | GSE71757 | GEO

Inflammation-Induced Stabilization of mRNA in Rheumatoid Arthritis

Project description:<p>During rheumatoid arthritis (RA), TNF activates fibroblast-like synoviocytes (FLS) inducing in a temporal order a constellation of genes, which perpetuate synovial inflammation. Although the molecular mechanisms regulating TNF-induced transcription are well characterized, little is known about the impact of mRNA stability on gene expression and the impact of TNF on decay rates of mRNA transcripts in FLS. To address these issues we performed RNA sequencing and genome-wide analysis of the mRNA stabilome in RA FLS. We found that TNF induces a biphasic gene expression program: initially, the inducible transcriptome consists primarily of unstable transcripts but progressively switches and becomes dominated by very stable transcripts. This temporal switch is due to: a) TNF-induced prolonged stabilization of previously unstable transcripts that enables progressive transcript accumulation over days and b) sustained expression and late induction of very stable transcripts. TNF- induced mRNA stabilization in RA FLS occurs during the late phase of TNF response, is MAPK-dependent, and involves several genes with pathogenic potential such as IL6, CXCL1, CXCL3, CXCL8/IL8, CCL2, and PTGS2. These results provide the first insights into genome-wide regulation of mRNA stability in RA FLS and highlight the potential contribution of dynamic regulation of the mRNA stabilome by TNF to chronic synovitis.</p>

| phs001371 | dbGaP

Landscape of protein-protein-interactions during hepatitis C virus assembly and release

Project description:Assembly of infectious hepatitis C virus (HCV) particles requires multiple cellular proteins including for instance apolipoprotein E (ApoE). To describe these protein-protein-interactions, we performed an affinity purification mass spectrometry screen (AP-MS) of HCV infected cells. We used functional viral constructs with epitope-tagged envelope protein 2 (E2), protein (p)7 or nonstructural protein 4B (NS4B), as well as cells expressing a tagged variant of ApoE. We also evaluated assembly stage-dependent remodeling of protein complexes by using viral mutants carrying point mutations abrogating particle production at distinct steps of the HCV particle production cascade. Detected were five ApoE binding proteins, 12 p7 binders, seven primary E2-interactors and 24 proteins interacting with NS4B. Cell-derived PREB, STT3B, SPCS2 as well as viral NS2 interacted with both p7 and E2. Only GTF3C3 interacted with E2 and NS4B, highlighting that HCV assembly and replication complexes exhibit largely distinct interactomes. An HCV core protein mutation, preventing core protein decoration of lipid droplets, profoundly altered the E2 interactome. In cells replicating this mutant, E2 interactions with HSPA5, STT3A/B, RAD23A/B and ZNF860 were significantly enhanced, suggesting that E2 protein interactions partly depend on core protein functions. Bioinformatic and functional studies including STRING network analyses, RNA interference, and ectopic expression support a role of Rad23A and Rad23B in facilitating HCV infectious virus production. Both Rad23A and Rad23B are involved in the endoplasmic reticulum (ER)-associated protein degradation (ERAD). Collectively, our results provide a map of host proteins interacting with HCV assembly proteins and they give evidence for the involvement of ER protein folding machineries and the ERAD pathway in the late stages of the HCV replication cycle.

2023-12-18 | PXD046941 | Pride

IL-3 coordination of myeloblast function by modulating mRNA stability

Project description:The growth factor interleukin-3 (IL-3) promotes the survival and growth of multipotent hematopoietic progenitors and stimulates myelopoiesis. It has also been reported to oppose terminal granulopoiesis and to support leukemic cell growth through autocrine or paracrine mechanisms. We used kinetic microarray, Northern Blotting and bioinformatics analysis of IL-3 dependent myeloblasts to determine whether IL-3 acts in part by regulating the rate of turnover of mRNA transcripts in specific functional pathways. Our results indicate that exposure of myeloblasts to IL-3 causes immediate early stabilization of hundreds of transcripts in pathways relevant to myeloblast function. Examples include transcripts associated with proliferation and leukemic transformation (pik3cd, myb, pim-1), hematopoietic development (cited2), differentiation control (cdkn1a) and RNA processing (BRF1, BRF2). A domain in the 3’-utr of IL-6 that mediates IL-3 responsiveness contains AU-rich elements that bind proteins known to modulate mRNA stability, however a known destabilizing protein (AUF1) is shown not to mediate degradation in the absence of IL-3. These findings support a model of IL-3 action through mRNA stability control and suggest that aberrant stabilization of this network of transcripts could contribute to growth patterns observed in leukemia.

2009-06-01 | GSE12067 | GEO

Viral lncRNA upregulates multiple A+U-richViral lncRNA upregulates multiple A+U-rich transcripts to promote cell motility and viral dissemination transcripts to promote cell motility and viral dissemination

Project description:Long non-coding RNAs are frequently associated with broad modulation of gene expression and thus provide the cell with the ability to synchronize entire metabolic processes. We used transcriptomic and proteomic approaches to investigate whether the most abundant human cytomegalovirus-encoded lncRNA, RNA2.7, has this characteristic. By comparing RNA2.7 deletion mutants with wild-type virus, RNA2.7 was found to regulate a large number of cellular genes late in infection. Pathway analysis indicated that >100 RNA2.7-regulated cellular genes are associated with promoting cell movement, and ten of the most highly regulated were verified in further experiments. Morphological analysis and live cell tracking showed that RNA2.7 promotes the movement and detachment of infected cells late in infection, and plaque assays using sparse cell monolayers demonstrated that RNA2.7 promotes cell-to-cell dissemination and spread of virus. Bioinformatic analysis indicated that RNA2.7-upregulated mRNAs are relatively A+U-rich, which is a trait associated with transcript instability, and that they are also enriched in motifs associated with mRNA instability. Experiments involving transcriptional inhibition showed that transcripts from four RNA2.7-regulated cellular genes were longer-lived in the presence of RNA2.7. These findings demonstrate that RNA2.7 promotes cell movement and viral dissemination late in infection and indicate that this may be due to general stabilization of A+U-rich transcripts.

2021-07-27 | PXD022277 | Pride

Altered m6A Modification of Specific Cellular Transcripts Affects Flaviviridae Infection

Project description:The RNA modification N6-methyladenosine (m6A) can modulate mRNA fate and thus affect many biological processes. We analyzed m6A modification across the transcriptome following infection by dengue virus (DENV), Zika virus (ZIKV), West Nile virus (WNV), and hepatitis C virus (HCV). We found that infection by these viruses in the Flaviviridae family alters m6A modification of specific cellular transcripts, including RIOK3 and CIRBP. During viral infection, the addition of m6A to RIOK3 promotes its translation, while loss of m6A in CIRBP promotes alternative splicing. Importantly, we found that viral activation of innate immune sensing or the endoplasmic reticulum (ER) stress response contributes to the changes in m6A modification in RIOK3 and CIRBP, respectively. Further, several transcripts with infection-altered m6A profiles, including RIOK3 and CIRBP, encode proteins that influence DENV, ZIKV, and HCV infection. Overall, this work reveals that cellular signaling pathways activated during viral infection lead to alterations in m6A modification of host mRNAs to regulate infection.

2019-10-11 | GSE138730 | GEO

IL-3 coordination of myeloblast function by modulating mRNA stability

2009-06-01 | E-GEOD-12067 | biostudies-arrayexpress

MeRIP-seq for host response to Flaviviridae infection

Project description:The modification N6-methyladenosine (m6A) affects rates of translation and degradation of mRNA transcripts. We analyzed m6A across the transcriptome following infection by dengue virus (DENV), Zika virus (ZIKV), West Nile virus (WNV), and hepatitis C virus (HCV) using MeRIP-seq. We used the uninfected replicates, among which we would expect little biological variation in methylation, as negative controls to validate statistical methods for the detection of m6A changes in MeRIP-seq data. Applying validated statistical methods, we found that innate immune response to Flaviviridae viruses alters m6A modification of specific cellular transcripts compared to uninfected controls. Finally, we find that these changes in m6A can in turn affect splicing or translation of genes relevant to infection.

2019-05-09 | GSE130891 | GEO

Global analysis of mRNA isoform half-lives: identification of stabilizing and destabilizing elements in yeast

Project description:We measured half-lives of 21,248 mRNA 3’ isoforms in yeast by rapidly depleting RNA polymerase II from the nucleus and performing direct RNA sequencing throughout the decay process. Interestingly, the half-lives of mRNA isoforms from the same gene, including nearly identical isoforms, often vary widely. Based on clusters of isoforms with different half-lives, we identify hundreds of sequences conferring stabilization or destabilization upon mRNAs terminating downstream. One class of stabilizing element is a polyU sequence that can interact with poly(A) tails, inhibit the association of poly(A) binding protein, and confer increased stability upon introduction into ectopic transcripts. More generally, destabilization and stabilization elements are linked to the degree to which the poly(A) tail can engage in double-stranded structures. Isoforms engineered to fold into 3’ stem-loop structures not involving the poly(A) tail exhibit even longer half-lives. We suggest that double-stranded structures at the 3’ ends are a major determinant of mRNA stability. Half-lives of 21,248 mRNA 3’ isoforms in yeast were measured by rapidly depleting RNA polymerase II from the nucleus and performing direct RNA sequencing throughout the decay process.

2014-04-02 | E-GEOD-52286 | biostudies-arrayexpress

Integrating Hepatitis C Screening With Dried Blood Spot Testing Into Colorectal Cancer Screening

Project description:The main purpose of the study is to compare the acceptance and viability of three strategies aimed to screen hepatitis C virus (HCV) infection in a birth cohort by: a) invitation letter offering HCV screening with dried blood spot (DBS) testing at the primary care center, b) invitation letter offering both HCV and colorectal cancer (CCR) screening with faecal occult test (FOT) at the primary care center, and c) invitation letter offering self-collected screening at home for HCV and CCR.

| 2312242 | ecrin-mdr-crc

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data