Related Experiment Video
Updated: Jan 30, 2026
11:34
Basic Caenorhabditis elegans Methods: Synchronization and Observation
Published on: June 10, 2012
49.4K
A conserved retromer-independent function for RAB-6.2 in C. elegans epidermis integrity
Jonathan D Kim1, Andy Y Chun1, Riley J Mangan1
1Department of Biology, Davidson College, Davidson, NC 28035, USA.
Journal of Cell Science
|January 23, 2019
Summary
The small GTPase RAB-6.2 is crucial for maintaining the integrity and impermeability of the C. elegans cuticle. Its function in the epidermis is conserved across species, suggesting a vital role in skin development.
Area of Science:
- Cellular Biology
- Molecular Biology
- Developmental Biology
Background:
- Rab proteins are essential small GTPases regulating intracellular trafficking.
- RAB-6.2 is a C. elegans ortholog of human RAB6 proteins, known for retrograde trafficking in neurons and intestines.
- Cuticle integrity is vital for organismal homeostasis and protection.
Purpose of the Study:
- To investigate the function of RAB-6.2 in C. elegans epidermis.
- To determine if RAB-6.2's function in cuticle integrity is evolutionarily conserved.
- To elucidate the molecular mechanisms underlying RAB-6.2's role in skin development.
Main Methods:
- Gene knockout (null) studies in C. elegans.
- Complementation assays using mouse RAB6A cDNA.
- Phenotypic analysis of cuticle integrity and impermeability.
- Comparison with exocyst and glycosylation mutants.
Main Results:
- RAB-6.2 is essential for C. elegans cuticle integrity and impermeability.
- Expression of mouse RAB6A rescues C. elegans epidermal defects caused by RAB-6.2 loss.
- RAB-6.2's function in the epidermis is distinct from its known neuronal roles.
- rab-6.2 null mutants exhibit phenotypes similar to mutants with defective surface glycosylation.
Conclusions:
- RAB-6.2 plays a critical, evolutionarily conserved role in C. elegans epidermal development and cuticle formation.
- RAB-6.2 may function by trafficking glycosylated cuticle proteins or glycosylation enzymes.
- This study reveals a novel function for RAB-6.2 in skin integrity, expanding its known cellular roles.
Related Concept Videos
01:25Rab Cascades
3.6K
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
3.6K
01:14Rab Proteins
5.1K
Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
5.1K
01:24Cells of the Epidermis
7.0K
The epidermis is made of four or five layers of epithelial cells, depending on its location in the body. From deep to superficial, these layers are the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
The cells in all these layers except the stratum basale are called keratinocytes, a type of cell that manufactures and stores the protein keratin. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from...
The cells in all these layers except the stratum basale are called keratinocytes, a type of cell that manufactures and stores the protein keratin. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from...
7.0K
02:26Conservation of Protein Domains Over Different Proteins
14.4K
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
14.4K
01:57What is Conservation Biology?
24.3K
Conservation biology is a scientific field that focuses on the preservation of biodiversity in order to protect ecosystems while meeting the needs of the human population. Humans require properly functioning ecosystems to maintain our supply of natural resources, including food, medicines, and building materials.
24.3K
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