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Programmable C-to-U RNA editing using the human APOBEC3A deaminase.

Xinxin Huang1,2, Junjun Lv1,2, Yongqin Li1,2

  • 1School of Life Sciences and Technology, ShanghaiTech University, Shanghai, China.

The EMBO Journal
|October 15, 2020
PubMed
Summary

Researchers developed CURE, a novel cytidine-specific RNA editor. This tool precisely targets C-to-U RNA editing, offering enhanced specificity and fewer off-target mutations compared to existing methods.

Keywords:
RESCUEApobecRNA editingprogrammablesite-directed RNA editing

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Area of Science:

  • Molecular Biology
  • RNA Editing Technologies
  • Gene Editing

Background:

  • Programmable RNA editing offers precise control over RNA sequences.
  • Existing bifunctional editors like RESCUE-S can deaminate both adenine and cytidine.
  • There is a need for highly specific cytidine-to-uridine RNA editors.

Purpose of the Study:

  • To develop the first cytidine-specific RNA editor, named CURE (Cytidine-to-Uracil RNA Editor).
  • To compare the specificity and efficiency of CURE with existing RNA editing tools.
  • To explore the potential of CURE for nuclear RNA editing.

Main Methods:

  • Fusion of the APOBEC3A cytidine deaminase enzyme with dCas13.
  • Utilizing unconventional guide RNAs (gRNAs) designed to induce loops at target sites.
  • Transcriptome-wide off-target analysis and comparison with RESCUE-S.

Main Results:

  • CURE demonstrates high specificity for cytidine-to-uridine (C-to-U) RNA editing.
  • CURE produces fewer missense mutations than RESCUE-S due to its specificity.
  • CURE and RESCUE-S show distinct yet overlapping motif preferences (UCC for CURE, AC for RESCUE-S).
  • Nuclear-localized CURE efficiently edits nuclear RNAs, unlike RESCUE-S.

Conclusions:

  • CURE represents a significant advancement in cytidine-specific RNA editing.
  • CURE offers a complementary tool to RESCUE-S with distinct advantages in specificity and localization.
  • The development of CURE expands the toolkit for precise RNA manipulation.