Site-Specific m⁶ A Erasing via Conditionally Stabilized CRISPR-Cas13b Editor.

Area of Science:

• Molecular Biology
• RNA Epigenetics
• Gene Editing Technologies

Background:

• N6-methyladenosine (m⁶ A) is a crucial RNA modification regulating diverse biological processes.
• CRISPR technology enables programmable m⁶ A editing, but large protein size and constitutive expression pose challenges.
• Existing CRISPR/RNA editing enzymes can interfere with native RNA and cellular functions.

Purpose of the Study:

• To develop a conditional and ligand-inducible platform for programmable m⁶ A editing.
• To overcome the limitations of bulky CRISPR proteins and constitutive enzyme expression in RNA editing.
• To enable site-specific m⁶ A erasure with minimal steric interference for functional studies.

Main Methods:

• Development of a conditional m⁶ A editing platform (FKBP*-dCas13b-ALK) utilizing a ligand-stabilized dCas13 editor.
• Inducible expression of the m⁶ A editing system controlled by the addition or removal of the Shield-1 molecule.
• Demonstration of targeted recruitment of dCas13b-m⁶ A eraser fusion protein and site-specific m⁶ A erasing under Shield-1 control.

Main Results:

• Successful implementation of a conditional, ligand-inducible m⁶ A editing system.
• Shield-1 molecule effectively controlled the expression and recruitment of the dCas13b fusion protein for targeted m⁶ A erasure.
• Rapid release and degradation of the dCas13b fusion protein post-Shield-1 removal, preceding m⁶ A restoration.

Conclusions:

• The FKBP*-dCas13b-ALK platform provides a novel method for conditional and inducible m⁶ A editing.
• This system allows precise control over m⁶ A erasure, facilitating the study of m⁶ A functions.
• The rapid clearance of the fusion protein minimizes steric hindrance, offering an improved approach for investigating RNA modification roles.