Transcriptome-wide identification of adenosine-to-inosine editing using the ICE-seq method

Area of Science:

• Molecular Biology
• Genomics
• RNA Biology

Background:

• Inosine (I) is a modified RNA base crucial for gene expression regulation in metazoans.
• Adenosine deaminase acting on RNA (ADAR) enzymes catalyze A-to-I RNA editing, converting adenosine (A) to inosine (I).
• Current methods for identifying inosine sites, like deep sequencing, suffer from high false-positive rates due to mapping errors.

Purpose of the Study:

• To develop a robust biochemical method for accurate transcriptome-wide identification of A-to-I RNA editing sites.
• To overcome the limitations of existing deep sequencing approaches in detecting inosine modifications.
• To provide a practical protocol for reliable RNA editing site analysis.

Main Methods:

• Development of inosine chemical erasing (ICE) using cyanoethylation and reverse transcription.
• Integration of ICE with deep sequencing (ICE-seq) for enhanced sensitivity and specificity.
• Establishment of a 22-day protocol for practical application of ICE-seq.

Main Results:

• ICE-seq enables reliable identification of transcriptome-wide A-to-I RNA editing sites.
• The method effectively minimizes false positives associated with mapping errors.
• A practical protocol for ICE-seq application is described, facilitating widespread use.

Conclusions:

• ICE-seq is a powerful tool for accurate and reliable mapping of A-to-I RNA editing sites.
• This method significantly advances the study of RNA modifications and their regulatory roles.
• The described protocol offers a standardized approach for RNA editing research.