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RNA Editing02:23

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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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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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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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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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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
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Functional Assessment of BRCA1 variants using CRISPR-Mediated Base Editors
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Target-stabilized base editors enable robust high-fidelity RNA editing.

Taian Liu1,2, Yunping Lin3,4,5, Qiwei Liu3

  • 1Research Center for Primate Neuromodulation and Neuroimaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China. ta.liu@siat.ac.cn.

Nature Communications
|February 25, 2026
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Summary
This summary is machine-generated.

RNA base editing is improved by the RECODE system, which uses engineered ADAR1 deaminase variants. This technology enhances precision by degrading unbound enzymes, reducing off-target effects and correcting disease-related mutations effectively.

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Area of Science:

  • Molecular Biology
  • Genetic Engineering
  • Biotechnology

Background:

  • RNA base editing offers precise mutation correction at the RNA level.
  • Off-target mutations caused by free deaminases limit current RNA editing technologies.

Purpose of the Study:

  • To develop a novel RNA editing system, RECODE, that enhances specificity and reduces off-target effects.
  • To engineer ADAR1 deaminase variants with regulated stability for improved RNA editing precision.

Main Methods:

  • Designed degron-tagged ADAR1 deaminase (ADAR1d) with guide RNA (gRNA)-regulated stability.
  • Engineered gRNA for target RNA-induced conformational switching to stabilize ADAR1d.
  • Utilized structure-guided rational engineering for ADAR1d optimization.

Main Results:

  • RECODE significantly reduced transcriptome-wide off-target edits while maintaining high on-target efficacy.
  • Target RNA-induced stabilization confined ADAR1d activity to intended sites, enhancing precision.
  • Successfully corrected an FUS mutation relevant to Amyotrophic Lateral Sclerosis and an Angptl3 mutation in vivo.

Conclusions:

  • RECODE represents a highly stringent and efficient RNA editing technology.
  • The study demonstrates a generalizable principle for enhancing the specificity of RNA-guided protein effectors.
  • RECODE effectively corrects disease-associated mutations and shows therapeutic potential in vivo.