Related Experiment Video
Updated: Feb 7, 2026
06:08
Automatic Identification of Dendritic Branches and their Orientation
Published on: September 17, 2021
2.3K
Actin blobs prefigure dendrite branching sites.
Vanitha Nithianandam1,2, Cheng-Ting Chien3,2
1Molecular and Cell Biology, Taiwan International Graduate Program, Academia Sinica and Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan.
The Journal of Cell Biology
|July 26, 2018
Summary
Dynamic actin blobs in neuronal dendrites, regulated by cofilin, are crucial for branching. These actin structures stall at future branching sites, guiding dendrite morphology and diversification.
Area of Science:
- Neuroscience
- Cell Biology
- Cytoskeleton Dynamics
Background:
- The actin cytoskeleton is vital for cell structure and neuronal dendrite morphogenesis.
- Dendritic branching involves dynamic changes, but actin dynamics in these processes are poorly understood.
Purpose of the Study:
- To investigate the dynamics of F-actin in neuronal dendrites.
- To elucidate the role of actin dynamics in dendrite branching and morphology.
Main Methods:
- In vivo imaging of F-actin markers in neuronal dendrites.
- Utilizing a G15S mutant to overstabilize F-actin.
- Identifying key regulatory proteins involved in actin dynamics.
Main Results:
- F-actin is highly dynamic and heterogeneously distributed in dendrites, enriched at terminal regions.
- A novel population of dynamic F-actin structures, termed 'actin blobs,' was observed propagating bidirectionally.
- Actin blobs stalled at future branching sites, and their stabilization inhibited branching.
- The F-actin-severing protein Tsr/cofilin was identified as a regulator of actin blobs and branching.
Conclusions:
- Actin blobs represent a key mechanism for regulating dendrite branching.
- The localization and dynamics of actin blobs at future branching sites contribute to dendritic morphology.
- Tsr/cofilin plays a critical role in modulating actin dynamics for dendrite development.
Related Concept Videos
01:14Generation of Straight or Branched Actin Filaments
3.8K
The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
3.8K
01:49Conserved Binding Sites
5.2K
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
5.2K
01:49Conserved Binding Sites
2.0K
2.0K
02:40Ligand Binding Sites
15.1K
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
15.1K
02:40Ligand Binding Sites
8.8K
8.8K
01:18Actin Treadmilling
9.7K
Actin filaments undergo polymerization and depolymerization from either end. The polymerization and depolymerization rates depend on the cytosolic concentration of free G-actins. The polymerization rate is generally higher at the plus or barbed end, while the depolymerization rate is higher at the minus or pointed end. At a steady state, critical concentration describes the concentration of free G-actin monomers at which the polymerization rate at the plus end is equal to that of the...
9.7K