Restoration of Genetic Code in Macular Mouse Fibroblasts via APOBEC1-Mediated RNA Editing

Area of Science:

• Molecular Biology
• Genetic Engineering
• Medical Genetics

Background:

• RNA editing, particularly C-to-U conversion, is crucial for genetic diversity and protein function in mammals.
• Menkes disease, a hereditary disorder affecting copper metabolism, results from mutations in the ATP7A gene.
• Controlling RNA editing enzymes like APOBEC1 is vital to prevent off-target modifications.

Purpose of the Study:

• To develop and validate a targeted RNA editing system for correcting mutations associated with Menkes disease.
• To investigate the potential of RNA base editing for therapeutic applications in genetic disorders.

Main Methods:

• Constructed plasmids encoding the MS2 system and the APOBEC1 deaminase domain.
• Designed a guide RNA with MS2 binding sites to direct RNA editing.
• Applied the system to restore a T>C mutation in the Atp7a gene in fibroblasts from a mouse model of Menkes disease.

Main Results:

• Successfully restored approximately 35% of mutated C nucleotides to U in the target Atp7a gene.
• Demonstrated the reliability and efficacy of the developed RNA editing system.
• Indicated significant potential for clinical therapeutic applications.

Conclusions:

• The developed RNA editing system is effective in correcting specific genetic mutations in a disease model.
• RNA base editing using human RNA-guided cytidine deaminases offers a promising avenue for in vivo therapeutic strategies.
• This approach holds potential for future advancements in treating genetic diseases.