Base editing repairs an SGCA mutation in human primary muscle stem cells.

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Genetics

Background:

• Skeletal muscle regeneration relies on muscle stem cells and myoblasts.
• Genetic mutations, like those in SGCA, cause severe muscular dystrophies.
• Autologous gene editing in human muscle stem cells for therapy remains largely unexplored.

Purpose of the Study:

• To investigate precise gene editing in human muscle stem cells for treating genetic muscle diseases.
• To correct the SGCA mutation causing limb-girdle muscular dystrophy 2D/R3.
• To assess the therapeutic potential of gene-repaired muscle stem cells.

Main Methods:

• Isolation of human muscle stem cells from patients with the SGCA c.157G>A mutation.
• Utilizing adenine base editing to correct the specific splicing mutation.
• In vivo assessment of gene-edited cells using mouse xenografts.

Main Results:

• Adenine base editing achieved >90% efficiency in correcting the SGCA mutation.
• The gene editing successfully rescued the splicing defect and restored α-sarcoglycan expression.
• Gene-corrected human muscle stem cells regenerated muscle and contributed to the satellite cell pool in vivo.

Conclusions:

• This study presents the first evidence of successful gene repair in autologous human muscle stem cells for muscular dystrophy.
• Gene-repaired muscle stem cells demonstrate regenerative capacity in vivo.
• This approach holds promise for developing cell replacement therapies for genetic muscle diseases.