PUBLICATION
In vivo cell biological screening identifies an endocytic capture mechanism for T-tubule formation
- Authors
- Hall, T.E., Martel, N., Ariotti, N., Xiong, Z., Lo, H.P., Ferguson, C., Rae, J., Lim, Y.W., Parton, R.G.
- ID
- ZDB-PUB-200728-18
- Date
- 2020
- Source
- Nature communications 11: 3711 (Journal)
- Registered Authors
- Hall, Thomas, Lo, Harriet, Parton, Robert G.
- Keywords
- none
- MeSH Terms
-
- Zebrafish
- Myofibrils/metabolism
- Golgi Apparatus/metabolism
- Calcium Channels/metabolism
- Calcium Channels/ultrastructure
- PubMed
- 32709891 Full text @ Nat. Commun.
Abstract
The skeletal muscle T-tubule is a specialized membrane domain essential for coordinated muscle contraction. However, in the absence of genetically tractable systems the mechanisms involved in T-tubule formation are unknown. Here, we use the optically transparent and genetically tractable zebrafish system to probe T-tubule development in vivo. By combining live imaging of transgenic markers with three-dimensional electron microscopy, we derive a four-dimensional quantitative model for T-tubule formation. To elucidate the mechanisms involved in T-tubule formation in vivo, we develop a quantitative screen for proteins that associate with and modulate early T-tubule formation, including an overexpression screen of the entire zebrafish Rab protein family. We propose an endocytic capture model involving firstly, formation of dynamic endocytic tubules at transient nucleation sites on the sarcolemma, secondly, stabilization by myofibrils/sarcoplasmic reticulum and finally, delivery of membrane from the recycling endosome and Golgi complex.
Genes / Markers
Figure Gallery (9 images)
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping