N⁶-Methyladenosines Modulate A-to-I RNA Editing

Area of Science:

• Molecular Biology
• Epigenetics
• RNA Biology

Background:

• N6-methyladenosine (m6A) and adenosine-to-inosine (A-to-I) are prevalent RNA modifications at adenosine residues.
• The interplay between m6A and A-to-I RNA editing remains largely unexplored.

Purpose of the Study:

• To investigate the relationship and potential interactions between m6A modification and A-to-I RNA editing.
• To elucidate how m6A influences the landscape of A-to-I editing.

Main Methods:

• Comparative analysis of A-to-I editing in m6A-positive versus m6A-negative RNA populations.
• Assessment of global A-to-I editing changes upon suppression of m6A-modifying enzymes.
• Investigation of adenosine deaminase acting on RNA (ADAR) enzyme association with m6A-depleted transcripts.

Main Results:

• A global difference in A-to-I editing was observed between m6A-positive and m6A-negative RNA.
• A negative correlation between m6A modification and A-to-I editing sites was identified.
• Suppression of m6A modification led to global changes in A-to-I editing and increased ADAR association with transcripts.

Conclusions:

• m6A modification negatively impacts A-to-I RNA editing.
• Depletion of m6A promotes A-to-I editing through enhanced ADAR binding.
• A complex interplay exists between m6A and A-to-I RNA modifications within the epitranscriptome.