Key result
Super-resolution microscopy reveals vertebrate muscle myosin mini-A-bands increase ~4-fold in length during myofibril assembly.
Why the study?
Despite extensive knowledge of individual sarcomeric proteins, how they assemble de novo into mature myofibrils remains challenging to understand.
Population
Avian skeletal muscle cells
Design
Microscopy study
Authors
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Challenges prior models of full-length thick filament assembly; leaves open validation in mammalian cardiac myofibrillogenesis.
Super-resolution microscopy reveals that vertebrate muscle myosin thick filaments assemble from 0.4 μm mini-A-Bands that grow to 1.6 μm, challenging previous reports that they form at their final length.
Welchons et al. (2023) studied Avian skeletal muscle development. Super-resolution microscopy (SIM and STED) was evaluated on Myofibril assembly and A-Band length. Super-resolution microscopy revealed that vertebrate muscle myosin thick filaments first form mini-A-Bands at ~0.4 μm and gradually increase four-fold to 1.6 μm in mature myofibrils.
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