Generation of the First Human In Vitro Model for McArdle Disease Based on iPSC Technology

Area of Science:

• Biochemistry
• Genetics
• Cell Biology

Background:

• McArdle disease is a rare autosomal recessive disorder caused by mutations in the PYGM gene, leading to exercise intolerance due to impaired muscle glycogenolysis.
• The absence of effective treatments is partly due to a lack of suitable in vitro human models for disease research.

Purpose of the Study:

• To establish the first human induced pluripotent stem cell (iPSC)-based model for McArdle disease.
• To create a functional in vitro model for studying disease mechanisms and testing therapeutic interventions.

Main Methods:

• Generated iPSCs from a McArdle disease patient with a specific PYGM mutation (c.148C>T; p.R50*).
• Differentiated iPSCs into functional myogenic cells that exhibit spontaneous contraction and calcium transients.
• Developed an isogenic control model and tested PYGM expression rescue using read-through compounds (PTC124, RTC13).

Main Results:

• Successfully created a human iPSC-based model of McArdle disease.
• Demonstrated the maturity and functionality of differentiated myogenic cells.
• Showcased proof-of-concept for rescuing PYGM expression using specific compounds.

Conclusions:

• The developed iPSC model provides a valuable platform for studying McArdle disease.
• This model facilitates the testing of drugs and compounds for potential therapeutic activity against McArdle disease.
• The study paves the way for future research into treatments for this debilitating genetic disorder.