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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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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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Developing PspCas13b-based enhanced RESCUE system, eRESCUE, with efficient RNA base editing.

Guo Li1,2, Yihan Wang3,4, Xiangyang Li5

  • 1State Key Laboratory of Agrobiotechnology, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193, China.

Cell Communication and Signaling : CCS
|August 12, 2021
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Summary
This summary is machine-generated.

A new enhanced RESCUE (eRESCUE) RNA base editor improves adenosine-to-inosine and cytidine-to-uridine editing efficiency. This tool aids in cellular function research and offers potential for genetic disease treatments.

Keywords:
IKKβPhosphorylationRNA base editingeRESCUE

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Area of Science:

  • Molecular Biology
  • Genetic Engineering
  • Biotechnology

Background:

  • RNA base editing offers potential for cellular research and treating genetic diseases.
  • Existing RNA base editors like REPAIR and RESCUE have limitations, particularly RESCUE's lower efficiency.
  • There is a need for more efficient RNA base editing tools.

Purpose of the Study:

  • To develop an enhanced RNA base editor with improved efficiency.
  • To evaluate the editing efficiency of the new system in human cells.
  • To demonstrate the application of the new editor in modulating gene function.

Main Methods:

  • Constructed an enhanced RESCUE (eRESCUE) system by fusing inactivated PspCas13b with evolved ADAR2.
  • Determined endogenous mRNA A-to-I and C-to-U editing efficiency in HEK-293T cells.
  • Utilized eRESCUE to induce a specific amino acid conversion in inhibitor kappa B kinase β (IKKβ).

Main Results:

  • The eRESCUE system demonstrated higher A-to-I and C-to-U RNA editing efficiency compared to the original RESCUE system.
  • Successfully induced 177Ser/Gly conversion in IKKβ by altering the genetic code from AGU to GGU.
  • Observed decreased IKKβ phosphorylation and downstream gene downregulation following the induced editing.

Conclusions:

  • Developed a more efficient RNA base editor, eRESCUE.
  • eRESCUE provides a valuable tool for biomedical research.
  • This enhanced editor holds promise for the treatment of genetic diseases.