CRISPR-Pass: Gene Rescue of Nonsense Mutations Using Adenine Base Editors

Area of Science:

• Genetics
• Molecular Biology
• Bioengineering

Background:

• Nonsense mutations cause premature translation termination, leading to non-functional proteins and genetic disorders.
• Current methods for read-through of premature termination codons (PTCs) are limited.
• Targeting PTCs is crucial for developing therapies for genetic diseases.

Purpose of the Study:

• To develop a novel, targeted tool for bypassing premature termination codons (PTCs).
• To assess the applicability and efficacy of the tool for treating nonsense mutations.
• To demonstrate the potential clinical utility of the developed tool.

Main Methods:

• Utilized CRISPR-mediated adenine base editors to create a targeted PTC-bypassing tool named CRISPR-pass.
• Applied CRISPR-pass to patient-derived fibroblasts.
• Evaluated the rescue of protein synthesis.

Main Results:

• CRISPR-pass demonstrated applicability to 95.5% of clinically significant nonsense mutations in the ClinVar database.
• The tool successfully rescued protein synthesis in patient-derived fibroblasts.
• These findings suggest significant potential for clinical application.

Conclusions:

• CRISPR-pass offers a promising strategy for bypassing premature termination codons.
• The tool has broad applicability to a majority of clinically relevant nonsense mutations.
• This research highlights a potential therapeutic avenue for genetic disorders caused by nonsense mutations.