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Results for “noncoding RNA”

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PubMed1988

Cap-independent translation of poliovirus mRNA is conferred by sequence elements within the 5' noncoding region.

Poliovirus polysomal RNA is naturally uncapped, and as such, its translation must bypass any 5' cap-dependent ribosome recognition event. To elucidate the manner by which poliovirus mRNA is translated, we have determined the translational efficiencies of a series of deletion mutants within the 5' noncoding region of the mRNA. We found striking differences in translatability among the altered mRNAs when assayed in mock-infected and poliovirus-infected HeLa cell extracts. The results identify a functional cis-acting element within the 5' noncoding region of the poliovirus mRNA which enables it to translate in a cap-independent fashion. The major determinant of this element maps between nucleotides 320 and 631 of the 5' end of the poliovirus mRNA. We also show that this region (320 to 631), when fused to a heterologous mRNA, can function in cis to render the mRNA cap independent in translation.

Base Sequence↗

PubMed2026

LncRNA HOTAIR contributes to cigarette smoke-induced pro-inflammatory responses in human airway epithelial cells.

Inhalation of cigarette smoke (CS) is the primary risk factor for chronic obstructive pulmonary disease (COPD), inducing epigenetic changes in the airway epithelium, including dysregulation of long-noncoding RNAs (lncRNAs). LncRNA homeobox gene transcript antisense RNA (HOTAIR) regulates chromatin remodeling and has been implicated in CS-induced malignant transformation. We hypothesized that HOTAIR expression is altered in COPD, leading to airway epithelial abnormalities. HOTAIR expression and overall survival were studied in The Cancer Genome Atlas (TCGA) database. Airway epithelial cells (AECs) were isolated from transplanted lungs of 11 patients with COPD, tracheobronchial tissue of 9 non-COPD donors, and bronchial brushings of ex-smokers with/without COPD (n = 6/group). HOTAIR expression, histone modifications, and production of proinflammatory cytokines (CXCL8 and GM-CSF) were assessed in the absence/presence of CS extract (CSE) and HOTAIR-polycomb inhibitor AQB. High HOTAIR expression correlated with poor overall survival in cancer patients with COPD, but not those without. Although HOTAIR expression was not significantly different between AECs from controls and subjects with COPD at baseline, it was significantly increased by 20% CSE only in COPD-derived AECs. CSE significantly decreased H3K4me3 levels in COPD-derived AECs, but not those from controls. AQB reduced baseline H3K27me3 levels in both groups, with a stronger effect in control-derived AECs. In addition, it reduced H3K4me3 levels in the presence of CSE in both groups. Finally, although AQB significantly suppressed CSE-induced production of GM-CSF and CXCL8 in control AECs, it failed to do so in COPD. Together, these findings suggest that COPD-derived AECs are more susceptible to CSE-induced HOTAIR upregulation, which may have a proinflammatory effect that cannot be inhibited by AQB.NEW & NOTEWORTHY COPD-derived AECs exhibit higher susceptibility to CSE-induced HOTAIR upregulation. CSE induces distinct histone modification patterns (H3K4me3) specifically in COPD-derived AECs. HOTAIR is essential for mediating CSE-induced proinflammatory responses in AECs.

Humans↗

PubMed2024

Expression profile of long noncoding RNAs and comprehensive analysis of lncRNA-cisTF-DGE regulation in condyloma acuminatum.

OBJECTIVE: To identify differentially expressed long noncoding RNAs (lncRNAs) in condyloma acuminatum (CA) and to explore their probable regulatory mechanisms by establishing coexpression networks. METHODS: High-throughput RNA sequencing was performed to assess genome-wide lncRNA expression in CA and paired adjacent mucosal tissue. The expression of candidate lncRNAs and their target genes in larger CA specimens was validated using real-time quantitative reverse transcriptase polymerase chain reaction (RT‒qPCR). Furthermore, Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses were used for the functional enrichment analysis of these candidate lncRNAs and differential mRNAs. The coexpressed mRNAs of the candidate lncRNAs, calculated by Pearson's correlation coefficient, were also analysed using GO and KEGG analysis. In addition, the interactions among differentially expressed lncRNAs (DElncRNAs)-cis-regulatory transcription factors (cisTFs)-differentially expressed genes (DEGs) were analysed and their network was constructed. RESULTS: A total of 546 lncRNAs and 2553 mRNAs were found to be differentially expressed in CA compared to the paired control. Functional enrichment analysis revealed that the DEGs coexpressed with DElncRNAs were enriched in the terms of cell adhesion and keratinocyte differentiation, and the pathways of ECM-receptor interaction, local adhesion, PI3K/AKT and TGF-ß signaling. We further constructed the network among DElncRNAs-cisTFs-DEGs and found that these 95 DEGs were mainly enriched in GO terms of epithelial development, regulation of transcription or gene expression. Furthermore, the expression of 3 pairs of DElncRNAs and cisTFs, EVX1-AS and HOXA13, HOXA11-AS and EVX1, and DLX6-AS and DLX5, was validated with a larger number of specimens using RT‒qPCR. CONCLUSION: CA has a specific lncRNA profile, and the differentially expressed lncRNAs play regulatory roles in mRNA expression through cis-acting TFs, which provides insight into their regulatory networks. It will be useful to understand the pathogenesis of CA to provide new directions for the prevention, clinical treatment and efficacy evaluation of CA.

RNA, Long Noncoding↗

PubMed1991

Translation of hepatitis A virus RNA in vitro: aberrant internal initiations influenced by 5' noncoding region.

Hepatitis A virus (HAV) RNAs were translated in vitro in rabbit reticulocyte lysates. The pattern of proteins synthesized from full-length HAV RNA was highly complex, consisting of a continuous spectrum of polypeptides ranging from less than 20,000 to greater than 200,000 Da. The pattern was not significantly altered by varying incubation times, ion, or other reaction parameters, or by the addition of HeLa or BS-C-1 cell extracts to the translation reactions. Plasmids engineered with mutations in the 3C coding region produced transcripts which directed the synthesis of the same overall pattern of polypeptide products as those transcribed from wild-type sequences, suggesting that protein processing by 3C did not generate the complex set of protein products. Translation of RNA containing only the P3 coding region of HAV, directly adjacent to the HAV 5' noncoding region, generated a set of protein products which precisely matched a subset of those synthesized from full-length HAV RNA. The translation products of P3 RNA, full-length RNA, and mutant 3C-containing RNAs were analyzed by immunoprecipitation with antisera specific for 3D, VP1, and 2C sequences; several products were subjected to N-terminal sequence analysis. All together, the results demonstrate that translation of HAV RNA in rabbit reticulocyte lysates initiates predominantly at a large number of internal AUG codons, especially those in the P3 coding region. A minor population of products is initiated from sites in the P1 and P2 regions. The latter proteins undergo some proteolytic processing, at unidentified sites, catalyzed by 3C protein sequences. Replacement of the HAV 5' noncoding region with encephalomyocarditis virus 5' end sequences increased initiation at the correct polyprotein start site and both reduced and altered the products generated by internal initiation.

3C Viral Proteases↗

PubMed2025

Nascent and Mature RNA Profiling by Subcellular Fractionation in Human Cells.

Transcription and RNA decay determine steady-state RNA levels in cells available for translation and RNA-mediated regulatory functions. Both processes can be assessed by various techniques, for majority, based on RNA labelling or chromatin immunoprecipitation, but require a high level of expertise. Here, we describe a cost-effective, fast, and simple protocol that enables the profiling of nascent and mature RNA in the cytoplasm, nucleoplasm, and chromatin through subcellular fractionation. The workflow can include α-amanitin inhibition of RNA Polymerase II to assess nascent RNAs as a proxy of transcriptional activity, or it can be used without this treatment to investigate distribution of partially processed or mature transcripts across distinct subcellular compartments. It is applicable for studying any of RNA biotypes, including small and long noncoding RNAs, mRNAs, and their splice variants, on both transcript-specific and transcriptome-wide scales. Nascent or mature RNAs isolated from each fraction can be further analyzed by any technique of choice (northern blot, reverse transcription, RNA sequencing).

Humans↗

PubMed2025

Popcorn: prediction of short coding and noncoding genomic sequences in prokaryotes.

SUMMARY: The most challenging prokaryotic genes to identify often correspond to short ORFs (sORFs) encoding small proteins or to noncoding RNAs. RNA-seq experiments commonly evince small transcripts that do not correspond to annotated genes and are candidates for novel coding sORFs or small regulatory RNAs, but it can be difficult to accurately assess whether the numerous small transcripts are coding or not. We present Popcorn (PrOkaryotic Prediction of Coding OR Noncoding), a novel machine learning method for determining whether prokaryotic sequences are coding or noncoding. We find that Popcorn is effective in distinguishing coding from noncoding sequences, including coding sORFs and noncoding RNAs. AVAILABILITY AND IMPLEMENTATION: Freely available for use on the web at https://cs.wellesley.edu/∼btjaden/Popcorn. Source code available at https://github.com/btjaden/Popcorn and https://doi.org/10.5281/zenodo.15120075.

Open Reading Frames↗

PubMed1988

Defined recombinants of poliovirus and coxsackievirus: sequence-specific deletions and functional substitutions in the 5'-noncoding regions of viral RNAs.

We describe the isolation of a variant of a polio--coxsackie recombinant virus (PCV110) containing a genomic RNA with a chimeric 5'-noncoding region. The variant virus [designated PCV110(1)] has growth and biosynthetic properties that are quite different from the original, temperature-sensitive isolate of the recombinant virus [designated PCV110(4)]. Nucleotide sequencing of the 5'-noncoding region of RNA from PCV110(1) revealed a 4-base deletion within the substituted coxsackievirus region of the chimeric genome that may contribute to the loss of temperature sensitivity of this variant recombinant virus. In addition, we have generated new recombinant viruses that contain (1) coxsackievirus sequences within the N66-N627 region of the poliovirus genome and (2) coxsackievirus sequences substituted from N1-N627 in the poliovirus genome. These recombinant viruses are not temperature sensitive for growth at 37 degrees and have biosynthetic properties similar to those of wild-type poliovirus. Our results provide evidence that replicase recognition signals encoded in the 5' noncoding regions of enterovirus genomic RNAs are not strictly sequence specific.

Base Sequence↗

PubMed2024

Whole transcriptome sequencing analyses of islets reveal ncRNA regulatory networks underlying impaired insulin secretion and increased β-cell mass in high fat diet-induced diabetes mellitus.

AIM: Our study aims to identify novel non-coding RNA-mRNA regulatory networks associated with β-cell dysfunction and compensatory responses in obesity-related diabetes. METHODS: Glucose metabolism, islet architecture and secretion, and insulin sensitivity were characterized in C57BL/6J mice fed on a 60% high-fat diet (HFD) or control for 24 weeks. Islets were isolated for whole transcriptome sequencing to identify differentially expressed (DE) mRNAs, miRNAs, IncRNAs, and circRNAs. Regulatory networks involving miRNA-mRNA, lncRNA-mRNA, and lncRNA-miRNA-mRNA were constructed and functions were assessed through Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses. RESULTS: Despite compensatory hyperinsulinemia and a significant increase in β-cell mass with a slow rate of proliferation, HFD mice exhibited impaired glucose tolerance. In isolated islets, insulin secretion in response to glucose and palmitic acid deteriorated after 24 weeks of HFD. Whole transcriptomic sequencing identified a total of 1324 DE mRNAs, 14 DE miRNAs, 179 DE lncRNAs, and 680 DE circRNAs. Our transcriptomic dataset unveiled several core regulatory axes involved in the impaired insulin secretion in HFD mice, such as miR-6948-5p/Cacna1c, miR-6964-3p/Cacna1b, miR-3572-5p/Hk2, miR-3572-5p/Cckar and miR-677-5p/Camk2d. Additionally, proliferative and apoptotic targets, including miR-216a-3p/FKBP5, miR-670-3p/Foxo3, miR-677-5p/RIPK1, miR-802-3p/Smad2 and ENSMUST00000176781/Caspase9 possibly contribute to the increased β-cell mass in HFD islets. Furthermore, competing endogenous RNAs (ceRNA) regulatory network involving 7 DE miRNAs, 15 DE lncRNAs and 38 DE mRNAs might also participate in the development of HFD-induced diabetes. CONCLUSIONS: The comprehensive whole transcriptomic sequencing revealed novel non-coding RNA-mRNA regulatory networks associated with impaired insulin secretion and increased β-cell mass in obesity-related diabetes.

Mice↗

PubMed1991

Nucleotide sequence of tomato ringspot virus RNA-2.

The sequence of tomato ringspot virus (TomRSV) RNA-2 has been determined. It is 7273 nucleotides in length excluding the 3' poly(A) tail and contains a single long open reading frame (ORF) of 5646 nucleotides in the positive sense beginning at position 78 and terminating at position 5723. A second in-frame AUG at position 441 is in a more favourable context for initiation of translation and may act as a site for initiation of translation. The TomRSV RNA-2 3' noncoding region is 1550 nucleotides in length. The coat protein is located in the C-terminal region of the large polypeptide and shows significant but limited amino acid sequence similarity to the putative coat proteins of the nepoviruses tomato black ring (TBRV), Hungarian grapevine chrome mosaic (GCMV) and grapevine fanleaf (GFLV). Comparisons of the coding and non-coding regions of TomRSV RNA-2 and the RNA components of TBRV, GCMV, GFLV and the comovirus cowpea mosaic virus revealed significant similarity for over 300 amino acids between the coding region immediately to the N-terminal side of the putative coat proteins of TomRSV and GFLV; very little similarity could be detected among the non-coding regions of TomRSV and any of these viruses.

Amino Acid Sequence↗

PubMed1986

Nucleotide sequence of the glycoprotein gene and intergenic region of the Lassa virus S genome RNA.

Two overlapping cDNA clones corresponding to the 5' region of the Lassa virus S genome RNA were isolated and their nucleotide sequences determined. Similar to Pichinde and lymphocytic choriomeningitis viruses (LCMV), Lassa virus has an ambisense S RNA. The precursor to the viral glycoproteins (GPC) is encoded in viral RNA sequence originating at position 56 and terminating at position 1529 from the 5' terminus of the S RNA. A short, noncoding, intergenic region capable of forming a hairpin structure separates the termination codons of the nucleoprotein (N) and GPC genes. Hydropathic analysis of the GPC gene product of Lassa virus indicates the presence of hydrophobic domains near the amino and carboxy termini as previously noted in the corresponding proteins of Pichinde and LCM viruses. A comparison of the nucleotide sequences on the 3' termini of the viral and viral-complimentary S RNA species of Lassa, LCM, and Pichinde viruses reveals slight sequence differences that may possibly be involved in the regulation of RNA synthesis and gene expression.

Amino Acid Sequence↗

PubMed1992

Nucleotide sequence and genetic map of cowpea severe mosaic virus RNA 2 and comparisons with RNA 2 of other comoviruses.

We report the nucleotide sequence of cowpea severe mosaic comovirus (CPSMV) genomic RNA 2. The molecule is composed of 3732 nucleotide (nt) residues, exclusive of the polyadenylate at the 3' end. Only one of the six reading frame registers has a long open reading frame, from nt 255 to nt 3260 in the polarity of encapsidated RNA and corresponding to a polyprotein of 1002 amino acid residues (aa). As has been reported for other comoviruses, a second in-frame AUG, at nt position 531, apparently also initiates translation, at least in vitro. Multiple alignments of the deduced CPSMV polyprotein aa sequence with those of bean pod mottle comovirus (BPMV), cowpea mosaic comovirus (CPMV), and red clover mottle comovirus (RCMV) were consistent with a similar size for each of the three genes: the putative movement protein, beginning at the second in-frame AUG, the large coat protein (L), and the small coat protein. Identical nucleotide sequences in the terminal noncoding regions of RNA 2 of the four viruses are limited to 9 nt at the 5' end and the 3' polyadenylate. However, extensive similarities in sequence and potential structure were found. For all three genes and the 5' untranslated region, CPSMV and BPMV are more similar to each other than either is to CPMV or RCMV, the last two being similar to each other. Observed similarities predict that both cleavage sites in the CPSMV RNA 2 polyprotein are at glutamine-serine dipeptides. A sequence of 16 aa at the amino terminus of L, determined by automated Edman degradation, matched a region of the deduced aa sequence in the polyprotein and is consistent with cleavage at the predicted glutamine-serine dipeptide.

Amino Acid Sequence↗

PubMed1987

Segment-specific and common nucleotide sequences in the noncoding regions of influenza B virus genome RNAs.

The nucleotide sequences of the 3' noncoding regions of all eight segments of influenza B virus RNA and the sequences of the 5' noncoding regions of segments 4-8 were determined in virus strains isolated over a period of 40 years. Nearly complete conservation of the noncoding sequences was found. Nine nucleotides at the 3' termini and 11 nucleotides at the 5' termini were common to all segments examined. In the region immediately adjacent to the common 3' terminal region, the nucleotides were specific for each segment and these segment-specific sequences were conserved in all strains examined. In each of the five segments in which both termini were examined, the segment-specific 3' sequences exhibited perfect inverted complementarity to a segment-specific sequence adjacent to the common 5' terminus. In addition, in the 3' noncoding region of RNA segments 1-3, which encode proteins involved in RNA synthesis, a single nucleotide substitution at position 10 was found that distinguishes these segments from segments 4-8. Comparison of these data with published reports has revealed that some of the features found in the noncoding regions of influenza B virus are also present in influenza A and C virus RNAs. In the RNAs of all three virus types, there is a segment-specific sequence of nucleotides near the 3' terminus that shows inverted complementarity to a sequence near the 5' terminus. This segment-specific sequence may play a role in the transcription of individual segments or in sorting of segments during virion assembly.

Animals↗

PubMed1979

Do eukaryotic mRNA 5' noncoding sequences base-pair with the 18 S ribosomal RNA 3' terminus?

Protein synthesis initiation on prokaryotic mRNAs involves base-pairing of a site preceding the initiation codon with the 3' terminal sequence of 16 S rRNA. It has been suggested that a similar situation may prevail in eukaryotic mRNAs. This suggestion is not based on experiments, but on observation of complementarities between mRNA 5' noncoding sequences and a conserved sequence near the 18 S rRNA 3' terminus. The hypothesis can be evaluated by comparing the number of potential binding sites found in the 5' noncoding sequences with the number of such sites expected to occur by chance. A method for computing this number is presented. The 5' noncoding sequences contain more binding sites than expected for a random RNA chain, but the same is true for 3' noncoding sequences. The effect can be traced to a clustering of purines and pyrimidines, common to noncoding sequences. In conclusion, a close inspection of the available mRNA sequences does not reveal any indication of a specific base-pairing ability between their 5' noncoding segments and the 18 S rRNA 3' terminus.

Animals↗

PubMed1991

A complex RNA sequence determines the internal initiation of encephalomyocarditis virus RNA translation.

Translation initiation on EMCV RNA occurs via binding of ribosomes to an internal sequence within the 5' noncoding region. To investigate the organization of the internal ribosome entry site (IRES) we have determined the translational efficiencies of a series of deletion mutants within the 5' noncoding region of EMCV RNA. Three functional regions have been distinguished: a sequence between nts 315-484 and the upper parts of the double-helical structural domains III (nts 488-647) and IV (nts 701-763). The first one greatly enhances translation, but is not absolutely necessary for internal initiation. The other two regions are indispensable to this process. A sequence within domain IV determines inhibition of in vitro translation of mRNAs with 5'-terminal dependent initiation. It is proposed to interact with a translational factor(s) common to the internal and 5'-terminal dependent initiation.

Binding Sites↗

PubMed2024

RNA-seq reveals differentially expressed lncRNAs and circRNAs and their associated functional network in HTR-8/Svneo cells under hypoxic conditions.

Placental hypoxia is hazardous to maternal health as well as fetal growth and development. Preeclampsia and intrauterine growth restriction are common pregnancy problems, and one of the causes is placental hypoxia. Placental hypoxia is linked to a number of pregnancy illnessesv. To investigate their potential function in anoxic circumstances, we mimicked the anoxic environment of HTR-8/Svneo cells and performed lncRNA and circRNA studies on anoxic HTR-8/Svneo cells using high-throughput RNA sequencing. The miRNA target genes were predicted by integrating the aberrant expression of miRNAs in the placenta of preeclampsia and intrauterine growth restriction, and a ceRNA network map was developed to conduct a complete transcriptomic and bioinformatics investigation of circRNAs and lncRNAs. The signaling pathways in which the genes were primarily engaged were predicted using GO and KEGG analyses. To propose a novel explanation for trophoblastic organism failure caused by lncRNAs and circRNAs in an anoxic environment.

Humans↗

PubMed1990

A region of the 5' noncoding region of foot-and-mouth disease virus RNA directs efficient internal initiation of protein synthesis within cells: involvement with the role of L protease in translational control.

Plasmids encoding bicistronic mRNAs have been constructed and used to identify a region from the 5' noncoding region of foot-and-mouth disease virus (FMDV) which directs efficient internal initiation of protein synthesis within cells. The loss of about 30 nucleotides (nt) from the 5' terminus or about 50 nt from the 3' terminus of the 435-nt region completely abolished the activity of this region. The expression of the FMDV L protease severely inhibited the expression of other genes unless they were preceded by this element. The regulation of protein synthesis mediated by FMDV is discussed.

Animals↗

PubMed1990

Substitutions in the protease (3Cpro) gene of poliovirus can suppress a mutation in the 5' noncoding region.

The poliovirus mutant 5NC-11 has a 4-base insertion at position 70 within the 5' untranslated region and is deficient in RNA synthesis. Revertants from 5NC-11 were isolated, showing a partial recovery of wild-type levels of RNA synthesis. The 5' noncoding region of those revertants contained the mutation intact; mix-and-match experiments with the cDNA from these revertants revealed that a restricted region within the 3C gene was the site of the suppressing mutations in the revertants. The suppressors were point mutations, confirmed by introducing them into the 3C gene by site-directed mutagenesis. Although complementation studies indicated that the suppressors were cis active, we believe that protein changes rather than RNA sequence alterations are responsible for the suppression because RNA changes that did not alter protein sequence had no effect, whereas various protein alterations were suppressive. The results therefore imply that protein 3C interacts with the 5' end of the RNA and may play a role in RNA replication.

Amino Acid Sequence↗

PubMed2026

Context-dependent effects of MIR100HG on tumorigenic phenotypes and p38/MAPK-AKT signaling in hepatocellular carcinoma.

Hepatocellular carcinoma (HCC) is one of the leading causes of cancer-related mortality worldwide and is characterized by a hypoxic tumor microenvironment that promotes tumor progression, cellular adaptation, and therapeutic resistance. Increasing evidence indicates that long non-coding RNAs (lncRNAs) play critical roles in regulating tumor-associated signaling networks; however, the contribution of MIR100HG to hepatocellular carcinoma progression, particularly under hypoxic conditions, remains insufficiently understood. In this study, we investigated the expression pattern and functional significance of MIR100HG in hepatocellular carcinoma using epithelial-like Hep3B and mesenchymal-like SNU-398 cells, together with non-tumor hepatocytes (Clone-9). Gain- and loss-of-function approaches were employed to evaluate the impact of MIR100HG on tumor-associated cellular phenotypes under both normoxic and hypoxic conditions. Functional assays demonstrated that MIR100HG overexpression significantly enhanced cell proliferation, clonogenic potential, migration, and invasion, whereas MIR100HG silencing markedly suppressed these tumorigenic properties and increased apoptotic cell death. Mechanistic analyses revealed that MIR100HG promotes oncogenic signaling through the p38/MAPK and AKT pathways under normoxic conditions, whereas MIR100HG depletion reduced the phosphorylation of these key signaling proteins. Notably, additional pathway analyses under hypoxia-mimicking conditions revealed a distinct signaling response, in which the MIR100HG-associated activation of p38/MAPK and AKT observed under normoxia was not maintained. Moreover, the expression patterns of AKT-associated regulatory genes, including GAS6 and PTEN, were reversed under hypoxia-mimicking conditions. These findings suggest that the effects of MIR100HG on oncogenic signaling are highly dependent on the cellular oxygenation context and that hypoxia reshapes the downstream signaling consequences of MIR100HG expression in HCC cells. Collectively, our findings identify MIR100HG as a hypoxia-associated oncogenic regulator that enhances tumorigenic phenotypes and promotes survival signaling in hepatocellular carcinoma. These results highlight MIR100HG as a potential biomarker and therapeutic target in liver cancer and provide new insights into the molecular mechanisms underlying hypoxia-driven tumor progression.

Humans↗