Related Experiment Video
Updated: Aug 6, 2026
Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
Published on: July 29, 2016
Modeling myotonic dystrophy type 1 with hiPSCs-derived cardiac organoids reveals key disease mechanisms
Cyrielle Jajkiewicz1, Valérie Pouliot1, Mohamed Chahine2
1CERVO Brain Research Centre, Quebec City, Quebec, Canada.
Insights
Myotonic dystrophy type 1 (DM1) cardiac dysfunction progresses from early electrical instability to later conduction and contractile problems. Mature 3D models reveal the full spectrum of DM1 heart disease, aiding therapeutic development.
Area of Science:
- Cardiovascular Research
- Stem Cell Biology
- Genetic Disorders
Background:
- Myotonic dystrophy type 1 (DM1) causes significant cardiac issues, including arrhythmias and sudden death.
- Human induced pluripotent stem cell (hiPSC)-derived cardiomyocytes are used to model DM1 cardiac dysfunction.
- Immature 2D cell cultures may not fully represent late-stage DM1 cardiac pathology.
Purpose of the Study:
- To examine the progression of cardiac dysfunction in DM1.
- To utilize developmentally mature 3D cardioids derived from patient-specific hiPSCs for this investigation.
Main Methods:
- Differentiated control and DM1 hiPSC lines into chamber-specific cardioids.
- Assessed electrophysiological properties using optical mapping and MEA.
- Quantified contractile performance and analyzed gene expression for molecular and structural maturation.
Main Results:
- DM1 cardioids showed stage-dependent cardiac dysfunction.
- Early DM1 cardioids exhibited electrical hyperexcitability.
- Later-stage DM1 cardioids displayed conduction slowing, impaired calcium handling, and reduced contractility.
Conclusions:
- DM1 cardiac pathology evolves dynamically during maturation.
- Developmentally mature 3D cardiac models are essential for capturing the full DM1 pathophysiology.
- This approach enhances translational modeling for therapeutic discovery in DM1.
Background:
Myotonic dystrophy type 1 (DM1) is a multisystemic disorder characterized by conduction defects and arrhythmias that contribute significantly to cardiac morbidity and sudden death. Human-induced pluripotent stem cell (hiPSC)-derived cardiomyocytes provide a powerful platform to model disease-specific cardiac dysfunction; however, immature 2-dimensional cultures may not fully capture late-stage pathological mechanisms.
Objective:
This study aimed to investigate the temporal evolution of cardiac dysfunction in DM1 using developmentally mature 3-dimensional cardioids derived from patient-specific hiPSCs.
Methods:
Control and DM1 hiPSC lines were differentiated into left ventricular and atrial cardioids following chamber-specific protocols and characterized at multiple developmental stages. Electrophysiological properties were assessed using optical mapping and multielectrode arrays, whereas contractile performance was quantified via motion analysis (MUSCLEMOTION). Gene-expression and immunofluorescence analyses were performed to evaluate molecular and structural maturation.
Results:
DM1 cardioids displayed a stage-dependent trajectory of dysfunction. Early-stage cardioids showed electrical hyperexcitability with shortened action potential duration and increased spontaneous activity. As differentiation progressed, DM1 cardioids exhibited significant conduction slowing, impaired calcium handling, and reduced contractile amplitude compared with controls. These progressive alterations were accompanied by dysregulation of ion channel and gap junction gene expression.
Conclusion:
Our findings demonstrate that DM1 cardiac pathology evolves dynamically during maturation, transitioning from early hyperexcitability to late-stage conduction and contractile defects. This study underscores the necessity of using developmentally mature 3-dimensional cardiac models to capture the full spectrum of DM1 pathophysiology and improve translational modeling for therapeutic discovery.
More Related Videos
10:37Fabrication of 3D Cardiac Microtissue Arrays using Human iPSC-Derived Cardiomyocytes, Cardiac Fibroblasts, and Endothelial Cells
Published on: March 14, 2021
08:37Sarcomere Shortening of Pluripotent Stem Cell-Derived Cardiomyocytes using Fluorescent-Tagged Sarcomere Proteins.
Published on: March 3, 2021
