Robust RNA editing via recruitment of endogenous ADARs using circular guide RNAs
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ABSTRACT:
PROVIDER: PRJNA692618 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR13448602_1.fastq.gz | Fastqsanger.gz | |||
| SRR13448602_2.fastq.gz | Fastqsanger.gz | |||
| SRR13448603_1.fastq.gz | Fastqsanger.gz | |||
| SRR13448603_2.fastq.gz | Fastqsanger.gz | |||
| SRR13448604_1.fastq.gz | Fastqsanger.gz |
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Project description:We engineered circular ADAR recruiting guide RNAs (cadRNAs) that efficiently recruit endogenous ADARs to edit specific sites on target RNA
2021-11-15 | GSE164956 | GEO
Project description:Molecular tools to target RNA site‐specifically allow recoding of RNA information and processing. SNAP‐tagged deaminases, guided by a chemically stabilized guideRNA, enable the simultaneous editing of targeted adenosine to inosine in several endogenous transcripts, with high efficiency (up to 90%), high potency, sufficient duration, and high precision. We applied SNAP‐ADARs for the efficient and concurrent editing of two disease‐relevant signaling transcripts, KRAS and STAT1. We also show improved performance compared to the recently described Cas13b-ADAR.
2018-06-01 | GSE112787 | GEO
Project description:Circular RNAs (circRNAs) are produced by head-to-tail back-splicing which is mainly facilitated by base-pairing of reverse complementary matches (RCMs) in circRNA flanking introns. Adenosine deaminases acting on RNA (ADARs) are known to bind double-stranded RNAs for adenosine to inosine (A-to-I) RNA editing. Here we characterize ADARs as potent regulators of circular transcriptome by identifying over a thousand of circRNAs regulated by ADARs in a bidirectional manner through and beyond their editing function. We found that editing can stabilize or destabilize secondary structures formed between RCMs via correcting A:C mismatches to I(G)-C pairs or creating I(G).U wobble pairs, respectively. We provided experimental evidence that editing also favors the binding of RNA-binding proteins such as PTBP1 to regulate back-splicing. These ADARs-regulated circRNAs which are ubiquitously expressed in multiple types of cancers, demonstrate high functional relevance to cancer. Our findings support a hitherto unappreciated bidirectional regulation of circular transcriptome by ADARs and highlights the complexity of cross-talk in RNA processing and its contributions to tumorigenesis.
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Project description:Efficient and precise editing of endogenous transcripts with SNAP-tagged ADARs
| PRJNA448951 | ENA
Project description:Molecular tools that target RNA at specific sites allow recoding of RNA information and processing. SNAP-tagged deaminases guided by a chemically stabilized guide RNA can edit targeted adenosine to inosine in several endogenous transcripts simultaneously, with high efficiency (up to 90%), high potency, sufficient editing duration, and high precision. We used adenosine deaminases acting on RNA (ADARs) fused to SNAP-tag for the efficient and concurrent editing of two disease-relevant signaling transcripts, KRAS and STAT1. We also demonstrate improved performance compared with that of the recently described Cas13b-ADAR.
| S-EPMC6322650 | biostudies-literature
Project description:Adenosine-to-inosine RNA base editing is a strategy developed to safely manipulate genetic information at the RNA level. Particularly promising for clinical implementation is the use of the ubiquitously expressed endogenous editing enzyme ADAR (adenosine deaminase acting on RNA) with tailored guide RNAs. However, the precision of editing could be compromised by global off-target events that can potentially occur throughout the transcriptome. In this study, we introduce a novel circular CLUSTER guide RNA design that recruits endogenous ADAR in vivo. The goals of the whole transcriptome sequencing experiment were to evaluate the A-to-G RNA editing index and the global editing precision of this novel design. To achieve this, Rett syndrome mice harboring a Mecp2 W104Amber mutation were treated either with a circular CLUSTER guide RNA targeting the mutant Mecp2 transcript or a scrambled and thus non-targeting control guide RNA. Both the targeting and the non-targeting guide RNA were encoded as AAV and delivered via retro-orbital injection of 4x10^12 viral genomes per mouse. The used AAV serotype PHP.eB allows cargo delivery to the mouse brain after systemic administration. Four weeks after injection the thalamus was isolated for NGS analysis. Whole transcriptome sequencing showed that the A-to-G RNA editing index was unaffected by treatment with the targeting guide RNA compared to the scrambled non-targeting control. We were unable to identify any global off-target events, excluding mouse to mouse variability, which suggests a very high precision of our approach on the transcriptome-wide level. Harnessing endogenous ADAR with permanent, AAV-driven CLUSTER guide RNAs in the CNS is an important next step towards the development of novel drug modalities that fight neurological diseases.
2024-06-27 | GSE265898 | GEO
Project description:RNA base editing represents a promising alternative for genome editing. Recent approaches harness the endogenous RNA editing enzyme ADAR to circumvent problems related to the ectopic expression of an editing enzyme, but they suffer from sequence restriction, lack of efficiency, and bystander editing. Here, we present in‐silico optimized CLUSTER guide RNAs, which bind their target mRNAs in a multivalent fashion and thereby enable editing with unprecedented precision as shown by next generation sequencing. CLUSTER guide RNAs can be genetically encoded and manufactured into viruses to work in various cell lines. They achieve on‐target editing on endogenous transcripts like GUSB and NUP43 with yields up to 45% without bystander editing and have been shown to recruit endogenous ADAR in vivo. The CLUSTER approach tremendously enlarges the sequence space available for guide RNA design and opens new avenues for drug development in the field of RNA base editing.
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Project description:Cellular RNAs containing double-stranded RNA (dsRNA) structures are subject to A-to-I RNA editing by the adenosine deaminases that act on RNA (ADARs). While A-to-I editing can alter mRNA coding potential, most editing is observed in non-coding sequences, the function of which remains poorly characterized. To correlate small RNA population with expression patterns of ADARs and hyperedited RNAs (editing-enriched regions: EERs) defined and characterized in a separate RNAseq analysis, we re-analyzed existing smallRNAseq datasets of a wildtype strain and a strain lacking ADARs (adr-1;adr-2). Analysis of primary siRNAs from mixed-stage worms revealed that ADARs impact siRNA biogenesis from EERs. We then analyzed primary and secondary RNAs mapping to EERs from embryo-stage or L4-stage worms and observed that ADAR effects on siRNA levels are dependent on developmental stage.
2018-02-23 | GSE89765 | GEO
Project description:Huge efforts are made to engineer safe and efficient genome editing tools. An alternative might be the harnessing of ADAR-mediated RNA editing. We now present the engineering of chemically optimized antisense oligonucleotides that recruit endogenous human ADARs to edit endogenous transcripts in a simple and programmable way, an approach we refer to as RESTORE. Notably, RESTORE was markedly precise, and there was no evidence for perturbation of the natural editing homeostasis. We applied RESTORE to a panel of standard human cell lines, but also to several human primary cells including hepatocytes. In contrast to other RNA and DNA editing strategies, this approach requires only the administration of an oligonucleotide, circumvents the ectopic expression of proteins, and thus represents an attractive platform for drug development. In this respect we have shown the repair of the PiZZ mutation causing α1-antitrypsin deficiency and the editing of phosphotyrosine 701 in STAT1.
2018-12-01 | GSE121573 | GEO
Project description:Adenosine deaminases that act on RNA (ADARs) are RNA editing enzymes that convert adenosine to inosine in double-stranded RNA (dsRNA). To evaluate effects of ADARs on small RNAs that derive from dsRNA precursors, we performed deep-sequencing, comparing small RNAs from wildtype and ADAR mutant C. elegans. While editing in small RNAs was rare, at least 40% of microRNAs had altered levels in at least one ADAR mutant strain, and miRNAs with significantly altered levels had mRNA targets with correspondingly affected levels. About 40% of siRNAs derived from endogenous genes (endo-siRNAs) also had altered levels in at least one mutant strain, including 63% of Dicer-dependent endo-siRNAs. The 26G class of endo-siRNAs was significantly affected by ADARs, and many altered 26G loci had intronic reads, and histone modifications associated with transcriptional silencing. Our data indicate ADARs, through both direct and indirect mechanisms, are important for maintaining wildtype levels of many small RNAs in C. elegans.
2012-04-05 | GSE28888 | GEO