RNA Editing Mechanisms in Gene Regulation

RNA editing denotes post-transcriptional modifications that alter nucleotide sequences within RNA molecules, thereby expanding the diversity and regulatory potential of the transcriptome. The most prevalent form in metazoans is adenosine-to-inosine (A-to-I) conversion, catalysed by the adenosine deaminase acting on RNA (ADAR) family. By deaminating specific adenosines in double-stranded RNA regions, editing can recode codons, create or remove splice sites and modulate interactions with microRNAs and RNA-binding proteins. These changes exert profound effects on mRNA stability, splicing patterns, translational efficiency and non-coding RNA function. Emerging evidence indicates that editing is dynamically regulated in a tissue-specific and developmental context, and that dysregulation contributes to diverse pathologies, including neurological disorders, immune dysfunction and cancer. Cross-talk between editing enzymes and innate immune sensors also illustrates a critical role for RNA editing in discerning self from non-self RNA, thereby safeguarding cellular homeostasis. Overall, RNA editing serves as a versatile regulatory layer that fine-tunes gene expression in response to physiological cues and stress signals.

Research from Nature Portfolio

High-throughput mapping of the human inosinome has generated an atlas of over three million A-to-I events across multiple tissues, revealing that editing profiles are highly tissue-specific and correlate strongly with local ADAR expression levels. This resource highlights enrichment of editing within genes linked to neuronal function and cancer pathways, offering a foundation for functional annotation of edited sites and identification of disease-relevant candidates. In parallel, systematic loss-of-function screens in diverse cancer cell lines have uncovered a subset that depend critically on ADAR1 for survival. Loss of ADAR1 activates the double-stranded RNA sensor PKR, triggering cell death, whereas disruption of PKR signalling rescues viability. These findings nominate ADAR1 as a potential therapeutic target in cancers characterised by heightened interferon signalling and suggest ways to exploit innate immune pathways in oncology.

RNA Editing Mechanisms in Gene Regulation publication trend

The graph below shows the total number of articles in rna editing mechanisms in gene regulation across all publications each year (not limited to Nature Index journals).

Technical terms

A-to-I editing: conversion of adenosine to inosine in RNA by deaminases.
ADAR: family of enzymes mediating A-to-I editing in double-stranded RNA.
Double-stranded RNA: RNA regions where complementary sequences form helices, substrates for editing.
Transcriptome: complete set of RNA transcripts in a cell.
MicroRNA: short non-coding RNAs that regulate gene expression post-transcriptionally.

References

1. The RNA editor ADAR2 promotes immune cell trafficking by enhancing endothelial responses to interleukin-6 during sterile inflammation. Immunity (2023).
2. Widespread A-to-I RNA Editing of Alu-Containing mRNAs in the Human Transcriptome. PLOS Biology (2004).
3. Profiling RNA editing in human tissues: towards the inosinome Atlas. Scientific Reports (2015).
4. Identification of ADAR1 adenosine deaminase dependency in a subset of cancer cells. Nature Communications (2018).
5. Principles Governing A-to-I RNA Editing in the Breast Cancer Transcriptome. Cell Reports (2015).