Related Experiment Video
Updated: Jul 30, 2026
10:46
Mechanical Stimulation-induced Calcium Wave Propagation in Cell Monolayers: The Example of Bovine Corneal Endothelial Cells
Published on: July 16, 2013
Inherited connexin mutations associated with hearing loss
1Department of Human Genetics & Molecular Medicine, Sackler School of Medicine, Tel Aviv University, Ramat Aviv, Israel.
Cell Communication & Adhesion
|June 18, 2002
Summary
Mutations in connexin genes, particularly connexin 26, are a major cause of hereditary hearing loss. Understanding connexin proteins
Area of Science:
- Genetics
- Otolaryngology
- Molecular Biology
Background:
- Hereditary hearing loss is a significant sensory defect.
- Connexin mutations are increasingly linked to this condition.
- Connexin 26 mutations account for 30-50% of inherited hearing loss.
Purpose of the Study:
- To investigate the role of connexin proteins in the mammalian inner ear.
- To understand the function of gap junctions in hearing.
- To explore connexin mutations' contribution to deafness.
Main Methods:
- Analysis of connexin gene mutations.
- Study of connexin protein expression in the cochlear duct.
- Utilizing mouse models with connexin mutations.
Main Results:
- Connexin proteins are expressed in the cochlear duct's gap junction regions.
- Connexin mutations are strongly associated with hereditary hearing loss.
- Specific connexin mutations lead to deafness in mouse models.
Conclusions:
- Gap junction proteins play a critical role in mammalian inner ear function.
- Connexin 26 is a key gene in hereditary hearing loss.
- Further research using mouse models will elucidate connexin function in hearing.
Related Concept Videos
01:33Pleiotropy
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
01:22Hair Cells
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
01:43Sex-linked Disorders
Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
01:37Gap Junctions
Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
01:27Gap Junctions
The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
00:50Unrenewable Cells
In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...