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RNA Editing02:23

RNA Editing

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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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RNA Structure01:19

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The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Related Experiment Video

Updated: Jun 16, 2025

A Nonsequencing Approach for the Rapid Detection of RNA Editing
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A Nonsequencing Approach for the Rapid Detection of RNA Editing

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Rational design of base, sugar and backbone modifications improves ADAR-mediated RNA editing.

Genliang Lu1, Chikdu Shivalila1, Prashant Monian1

  • 1Wave Life Sciences, Cambridge, MA, USA.

Nucleic Acids Research
|August 16, 2024
PubMed
Summary
This summary is machine-generated.

New oligonucleotide designs, called AIMers, enhance RNA editing by interacting with adenosine deaminases acting on RNA (ADAR) enzymes. Modifications, including N-3-uridine (N3U), significantly boost editing efficiency in vitro and in vivo.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • RNA Therapeutics

Background:

  • Adenosine to inosine (A-to-I) RNA editing is a crucial post-transcriptional modification mediated by adenosine deaminases acting on RNA (ADAR) enzymes.
  • AIMers (ADAR-targeting chimera) are chemically modified oligonucleotides designed to recruit ADARs to specific RNA sites for targeted editing.
  • Previous AIMer designs showed promise but required further optimization for enhanced efficiency and broader applicability.

Purpose of the Study:

  • To develop novel AIMer designs with improved RNA editing efficiency.
  • To investigate the impact of specific base, sugar, and backbone modifications on AIMer performance.
  • To explore the potential of N-3-uridine (N3U) as a key modification for enhancing ADAR-mediated RNA editing.

Main Methods:

  • Synthesis and chemical modification of various AIMer designs.
  • In vitro and in vivo assays to measure RNA editing efficiency.
  • Molecular modeling to elucidate the mechanism of enhanced ADAR interaction.
  • Exploration of N3U and its analogs for ADAR targeting.

Main Results:

  • Novel backbone and 2' sugar modifications significantly enhanced AIMer editing efficiency across diverse sequences.
  • Incorporation of N-3-uridine (N3U) at the 'orphan base' position consistently outperformed cytidine (C) in boosting RNA editing.
  • Combined modifications, including N3U, demonstrated superior in vitro and in vivo RNA editing capabilities.
  • Molecular modeling suggested N3U stabilizes AIMer-ADAR interactions, potentially increasing catalytic activity.

Conclusions:

  • Advanced AIMer designs incorporating specific chemical modifications, particularly N3U, represent a significant improvement in RNA editing technology.
  • These optimized AIMers offer enhanced efficiency and a broader targetable sequence space for therapeutic applications.
  • The findings provide a foundation for the development of next-generation RNA editing tools with potential in treating genetic disorders.