Skeletal Muscle Cells Derived from Induced Pluripotent Stem Cells: A Platform for Limb Girdle Muscular Dystrophies

Area of Science:

• Biomedical Sciences
• Stem Cell Biology
• Genetics and Genomics

Background:

• Limb girdle muscular dystrophies (LGMD) are a prevalent group of genetic muscle diseases, affecting approximately 1 in 3000 individuals.
• Despite identifying genetic causes for LGMD, effective treatments remain limited, highlighting an unmet medical need.
• Current research models often rely on primary, immortalized, or genetically modified cells, which have limitations in availability and relevance.

Purpose of the Study:

• To establish and validate a novel cellular modeling platform for Limb girdle muscular dystrophies (LGMD) using human induced pluripotent stem cells (hiPSC).
• To demonstrate the utility of hiPSC-derived skeletal muscle cells (skMC) as a renewable and physiologically relevant model for LGMD research.
• To evaluate the potential of this platform for studying specific LGMD subtypes, exemplified by Limb girdle muscular dystrophy type R9 (LGMDR9).

Main Methods:

• Generation of skeletal muscle cells (skMC) from human induced pluripotent stem cells (hiPSC).
• Characterization of hiPSC-derived skMC for the expression of LGMD-related genes and proteins.
• Application of the hiPSC-based model to study disease-specific phenotypes in LGMDR9 using cells from affected patients.

Main Results:

• hiPSC possess self-renewal and pluripotency, enabling a renewable source of skeletal muscle cells (skMC).
• skMC derived from hiPSC successfully express a majority of the genes and proteins implicated in Limb girdle muscular dystrophies (LGMD).
• Disease-specific phenotypes were successfully evaluated in skMC derived from hiPSC of four LGMDR9 patients, validating the model's utility.

Conclusions:

• A robust hiPSC-based platform has been developed for modeling Limb girdle muscular dystrophies (LGMD).
• This platform offers a renewable and alternative source of skeletal muscle cells (skMC) for studying LGMD pathogenesis and potential therapies.
• The model is effective for investigating disease-specific phenotypes, as demonstrated for LGMDR9, paving the way for future research in genetic muscle diseases.