Tissue-specific modulation of CRISPR activity by miRNA-sensing guide RNAs

Area of Science:

• Biomedical engineering
• Molecular biology
• Gene editing technologies

Background:

• Nucleic acid nanostructures offer programmable functions for biomedical applications.
• Controlling therapeutic cargo based on molecular signatures can improve cell specificity and reduce off-target effects.
• Endogenous microRNAs (miRNAs) serve as reliable indicators of cell type and state, suitable for RNA nanodevices.

Purpose of the Study:

• To introduce CRISPR MiRAGE, a novel tool for miRNA-activated genome editing.
• To demonstrate the functionality of a dynamic single-guide RNA that senses specific miRNA signatures.
• To achieve targeted gene editing in specific cell types using endogenous molecular cues.

Main Methods:

• Development of a dynamic single-guide RNA (sgRNA) that interacts with miRNA-Argonaute complexes.
• Integration of the miRNA-sensing sgRNA with CRISPR-Cas gene editing systems.
• In vivo testing of CRISPR MiRAGE in Duchenne muscular dystrophy models for muscle-specific gene editing.

Main Results:

• The miRNA-sensing sgRNA successfully detected specific miRNA signatures.
• CRISPR MiRAGE demonstrated muscle-specific activation of gene editing in disease models.
• The technology enables precise control over CRISPR activity based on cellular miRNA profiles.

Conclusions:

• CRISPR MiRAGE represents a significant advancement in RNA-controlled gene editing.
• This technology holds promise for developing tissue-specific CRISPR-based therapies.
• CRISPR MiRAGE can overcome challenges in cell specificity and off-target effects for treating human diseases.