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Related Concept Videos

Gap Junctions01:37

Gap Junctions

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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...
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Hair Cells01:22

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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.
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The Cochlea01:13

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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Auditory Pathway01:15

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
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Direct connexin-26 interactions with membrane proteins functionally relevant to the cochlea.

Jennifer Costa Leoncio1,2, Ana Carla Batissoco3,4, Thiago Geronimo Pires Alegria1

  • 1Centro de Pesquisa Sobre o Genoma Humano e Células-Tronco (HUG- CELL), Departamento de Genética e Biologia Evolutiva, Instituto de Biociências IBUSP, Universidade de São Paulo, São Paulo, SP, 05508-090, Brazil.

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Connexin 26 (Cx26) protein interactions were identified using a yeast two-hybrid screen. This research uncovers potential new candidates for genetic hearing loss and related skin disorders by mapping Cx26 partners in cochlea and skin cells.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Otolaryngology

Background:

  • Connexin 26 (Cx26), encoded by the GJB2 gene, is vital in the cochlea and skin.
  • GJB2 mutations cause hearing loss and skin conditions, but the etiology of some cases remains unknown.
  • Identifying Cx26 interacting proteins may reveal new genetic factors for hearing loss.

Purpose of the Study:

  • To identify direct protein partners of Connexin 26.
  • To investigate the relevance of these interactions in cochlear and skin physiology.
  • To explore potential links between Cx26 interactors and genetic hearing loss or skin disorders.

Main Methods:

  • A human fetal brain cDNA library was screened using a membrane yeast two-hybrid assay to find Cx26 interacting proteins.
  • In-silico characterization was performed on identified interactors.
  • Coexpression analysis of Cx26 and its interactors was conducted in mouse cochlea and embryonic keratinocytes.

Main Results:

  • Forty direct Connexin 26 interactors were identified.
  • The mouse Gjb2 orthologue coexpressed with 95% of these interactors in cochlea and 70% in keratinocytes.
  • Interactome analysis revealed enrichment of transporter activity, including ion transporters, in cochlear supporting cells. Nine genes were linked to deafness/skin disorders or hearing loss loci.

Conclusions:

  • The Connexin 26 interactome includes proteins crucial for cochlear and skin function.
  • This network provides potential candidates for understanding genetic hearing loss and associated skin phenotypes.
  • The findings highlight the role of Cx26-associated proteins in ion transport and cellular communication relevant to hearing.