Browse
Submit Data
Databases
API
Help

Dataset Information

16 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Detection of siRNA-mediated target mRNA cleavage activities in human cells by a novel stem-loop array RT-PCR analysis.

ABSTRACT: The small interfering RNA (siRNA)-mediated target mRNA cleavage activity generates cleaved mRNA fragments with varied termini, which creates major technical challenges for the accurate and efficient detection and verification of cleavage sites on target mRNAs. Here we used a sensitive stem-loop array reverse transcription polymerase chain reaction (SLA-RT-PCR) approach to detect and verify the siRNA-mediated target mRNA cleavage sites by determining precise sequences at the 3'-termini of cleaved mRNA fragments in human cells under physiological conditions. Our results demonstrated the great potential and broad applications of using the SLA-RT-PCR as a sensitive, cost-efficient, and high-throughput tool to systematically detect siRNA-targeted mRNA cleavage sites and fragments in human cells.

SUBMITTER: Lin J

PROVIDER: S-EPMC4776327 | biostudies-literature |

REPOSITORIES: biostudies-literature

ACCESS DATA

Json Xml

Similar Datasets

Serum miRNA profiling by quantitative RT PCR [RT-PCR Array 2]

Project description:Initial screening, the expression of 125 mature miRNA was compared between pooled control and autism samples by two microarray analysis. The differential expression of 14 miRNA was further validated by SYBR green quantitative PCR of Individual samples. Thirteen miRNAs were differetially expressed in autistic individuals compared to the controls (8 upregulated and 5 down regulated). miR-151a-3p, miR-181b-5p, miR-320a, miR-328, miR-433, miR-489, miR-572, and miR-663a were downregulated, while miR-101-3p, miR-106b-5p, miR-130a-3p, miR-195-5p, and miR-19b-3p were upregulated. We have identified a set of serum miRNAs that could be used as non-invasive biomarkers for autism.

2014-06-27 | GSE58848 | GEO

Serum miRNA profiling by quantitative RT PCR [RT-PCR Array 1]

2014-06-27 | GSE58847 | GEO

The importance of RT-qPCR primer design for the detection of siRNA-mediated mRNA silencing.

Project description:BACKGROUND: The use of RNAi to analyse gene function in vitro is now widely applied in biological research. However, several difficulties are associated with its use in vivo, mainly relating to inefficient delivery and non-specific effects of short RNA duplexes in animal models. The latter can lead to false positive results when real-time RT-qPCR alone is used to measure target mRNA knockdown. FINDINGS: We observed that detection of an apparent siRNA-mediated knockdown in vivo was dependent on the primers used for real-time RT-qPCR measurement of the target mRNA. Two siRNAs specific for RRM1 with equivalent activity in vitro were administered to A549 xenografts via intratumoural injection. In each case, apparent knockdown of RRM1 mRNA was observed only when the primer pair used in RT-qPCR flanked the siRNA cleavage site. This false-positive result was found to result from co-purified siRNA interfering with both reverse transcription and qPCR. CONCLUSIONS: Our data suggest that using primers flanking the siRNA-mediated cleavage site in RT-qPCR-based measurements of mRNA knockdown in vivo can lead to false positive results. This is particularly relevant where high concentrations of siRNA are introduced, particularly via intratumoural injection, as the siRNA may be co-purified with the RNA and interfere with downstream enzymatic steps. Based on these results, using primers flanking the siRNA target site should be avoided when measuring knockdown of target mRNA by real-time RT-qPCR.

| S-EPMC3123217 | biostudies-literature

Qiagen RT-PCR array Dimethylamin validation experiment

Project description:This study compares the dose dependent transcriptome data obtained for the volatile compound dimethylamine, which has been exposed in an in vitro system via air-liquid-interface (ALI) exposure to a pulmonary cell line (A549 cells).

2024-06-25 | GSE240876 | GEO

RT² Profiler™ PCR Array Human Senesence

Project description:In vivo restoration of aged bone marrow mononuclear cells by micrRNA: effect on cellular senesence Treatment groups were (1) no microRNA, (2) microRNA-619 (miR-619), (3) a combination of microRNAs-619, -1303, 4497 (miR-combo), or (4) a control microRNA expected to have no effect (control RNA)

2021-12-01 | GSE141838 | GEO

RT² Profiler™ PCR Array Human Aging

Project description:in vivo restoration of aged bone marrow mononuclear cells by microRNA: effect on cellular aging Treatment groups were (1) no microRNA, (2) microRNA-619 (miR-619), (3) a combination of microRNAs-619, -1303, 4497 (miR-combo), or (4) a control microRNA expected to have no effect (control RNA)

2021-12-01 | GSE141837 | GEO

A ribonuclease coordinates siRNA amplification and mRNA cleavage during RNAi.

Project description:Effective silencing by RNA-interference (RNAi) depends on mechanisms that amplify and propagate the silencing signal. In some organisms, small-interfering RNAs (siRNAs) are amplified from target mRNAs by RNA-dependent RNA polymerase (RdRP). Both RdRP recruitment and mRNA silencing require Argonaute proteins, which are generally thought to degrade RNAi targets by directly cleaving them. However, in C. elegans, the enzymatic activity of the primary Argonaute, RDE-1, is not required for silencing activity. We show that RDE-1 can instead recruit an endoribonuclease, RDE-8, to target RNA. RDE-8 can cleave RNA in vitro and is needed for the production of 3' uridylated fragments of target mRNA in vivo. We also find that RDE-8 promotes RdRP activity, thereby ensuring amplification of siRNAs. Together, our findings suggest a model in which RDE-8 cleaves target mRNAs to mediate silencing, while generating 3' uridylated mRNA fragments to serve as templates for the RdRP-directed amplification of the silencing signal.

| S-EPMC4318647 | biostudies-literature

Real-time quantification of microRNAs by stem-loop RT-PCR.

Project description:A novel microRNA (miRNA) quantification method has been developed using stem-loop RT followed by TaqMan PCR analysis. Stem-loop RT primers are better than conventional ones in terms of RT efficiency and specificity. TaqMan miRNA assays are specific for mature miRNAs and discriminate among related miRNAs that differ by as little as one nucleotide. Furthermore, they are not affected by genomic DNA contamination. Precise quantification is achieved routinely with as little as 25 pg of total RNA for most miRNAs. In fact, the high sensitivity, specificity and precision of this method allows for direct analysis of a single cell without nucleic acid purification. Like standard TaqMan gene expression assays, TaqMan miRNA assays exhibit a dynamic range of seven orders of magnitude. Quantification of five miRNAs in seven mouse tissues showed variation from less than 10 to more than 30,000 copies per cell. This method enables fast, accurate and sensitive miRNA expression profiling and can identify and monitor potential biomarkers specific to tissues or diseases. Stem-loop RT-PCR can be used for the quantification of other small RNA molecules such as short interfering RNAs (siRNAs). Furthermore, the concept of stem-loop RT primer design could be applied in small RNA cloning and multiplex assays for better specificity and efficiency.

| S-EPMC1292995 | biostudies-literature

Target mRNA abundance dilutes microRNA and siRNA activity.

Project description:Post-transcriptional regulation by microRNAs and siRNAs depends not only on characteristics of individual binding sites in target mRNA molecules, but also on system-level properties such as overall molecular concentrations. We hypothesize that an intracellular pool of microRNAs/siRNAs faced with a larger number of available predicted target transcripts will downregulate each individual target gene to a lesser extent. To test this hypothesis, we analyzed mRNA expression change from 178 microRNA and siRNA transfection experiments in two cell lines. We find that downregulation of particular genes mediated by microRNAs and siRNAs indeed varies with the total concentration of available target transcripts. We conclude that to interpret and design experiments involving gene regulation by small RNAs, global properties, such as target mRNA abundance, need to be considered in addition to local determinants. We propose that analysis of microRNA/siRNA targeting would benefit from a more quantitative definition, rather than simple categorization of genes as 'target' or 'not a target.' Our results are important for understanding microRNA regulation and may also have implications for siRNA design and small RNA therapeutics.

| S-EPMC2872614 | biostudies-literature

Real-Time RT-PCR Detection of Equine Coronavirus

Project description:Equine coronavirus (ECoV) is a recently identified equine virus, involved mainly in enteric infections. Since the ECoV discovery in 1999, only two real-time RT-PCRs have been developed for viral identification. In this chapter we describe a one-step real-time RT-PCR that has been routinely used in our laboratory for ECoV detection from fecal and respiratory samples.

| S-EPMC7120059 | biostudies-literature

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

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