m6A eraser ALKBH5/treRNA1/DDX46 axis regulates BCR expression

Area of Science:

• Epitranscriptomics
• Molecular Biology
• Immunology

Background:

• N6-methyladenosine (m6A) modifications regulate RNA processing and are vital in B-cell immunity and cancer.
• ALKBH5 is a key RNA demethylase, but its role in B-cell receptor (BCR) signaling remains unclear.

Purpose of the Study:

• To investigate the role of m6A demethylation in BCR signaling pathways.
• To identify novel regulators involved in m6A removal within B-cells.

Main Methods:

• Investigated the interaction between ALKBH5, treRNA1 (Translation Regulatory Long Non-Coding RNA 1), and DDX46 (RNA helicase) in B-cells.
• Analyzed the impact of m6A demethylation on BCR signaling pathway transcripts.
• Assessed the effects of disrupting the ALKBH5-treRNA1-DDX46 axis on B-cell function.

Main Results:

• A novel complex of ALKBH5, treRNA1, and DDX46 was identified, which translocates to the nucleus upon activation.
• This complex removes m6A marks from BCR signaling-related transcripts, enhancing their stability and translation via HuR.
• Loss of ALKBH5, treRNA1, or DDX46 impaired RNA processing and reduced BCR gene expression.

Conclusions:

• The ALKBH5-treRNA1-DDX46 complex plays a critical role in B-cell functionality by regulating RNA dynamics through m6A demethylation.
• This epitranscriptomic mechanism is essential for maintaining proper BCR signaling and offers potential therapeutic targets for immune disorders and cancer.