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Updated: Sep 16, 2025

Real Time and Repeated Measurement of Skeletal Muscle Growth in Individual Live Zebrafish Subjected to Altered Electrical Activity
Published on: June 16, 2022
Muscle growth by sarcomere divisions
Clement Rodier1, Ian D Estabrook2, Eunice HoYee Chan1
1CNRS, IBDM, Turing Centre for Living Systems, Aix Marseille University, Marseille, France.
Individual sarcomeres divide to form new sarcomeres, enabling muscle growth and repair during development. This process ensures muscle cells maintain mechanical integrity as the skeleton grows.
Area of Science:
- Muscle biology
- Developmental biology
- Cellular mechanics
Background:
- Sarcomeres are the fundamental contractile units of muscle.
- Muscle cells grow by increasing length, requiring new sarcomeres.
- The mechanism of sarcomere addition during development was previously unknown.
Purpose of the Study:
- To investigate how muscles add new sarcomeres to facilitate growth.
- To understand the process of sarcomere addition during Drosophila development.
Main Methods:
- Live imaging of sarcomere components in developing Drosophila.
- High-throughput image analysis to track sarcomere dynamics.
Main Results:
- Individual sarcomeres divide along the myofibril tension axis into daughter sarcomeres.
- New sarcomeres are inserted into myofibrils, maintaining mechanical integrity.
- Sarcomere division appears to be triggered by tension and local damage.
Conclusions:
- Sarcomere division is a novel mechanism for muscle growth during development.
- This process repairs damaged sarcomeres and synchronizes muscle growth with skeletal growth.
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