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Related Concept Videos

Gap Junctions01:27

Gap Junctions

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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...
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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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Outer Layers of the Cell Envelope01:18

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The outermost layers of prokaryotic cells play a critical role in their survival, virulence, and interaction with the environment. These layers, often composed of polysaccharides, polypeptides, or proteins, form protective and adhesive structures that vary in organization and function.Capsules and Slime LayersCapsules are highly organized, tightly bound layers that firmly attach to the bacterial cell wall. Capsules are usually made of polysaccharides, though some are made of polypeptides. These...
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P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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The Neuromuscular Junction01:19

The Neuromuscular Junction

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The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
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Anchoring Junctions01:03

Anchoring Junctions

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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Related Experiment Video

Updated: Feb 4, 2026

Cut-loading: A Useful Tool for Examining the Extent of Gap Junction Tracer Coupling Between Retinal Neurons
10:11

Cut-loading: A Useful Tool for Examining the Extent of Gap Junction Tracer Coupling Between Retinal Neurons

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Retinal Cx36 gap junctions in the inner and outer plexiform layers differentially control visual thresholds.

Sam LaMagna1, Eduardo Solessio1

  • 1Center for Vision Research, Department of Ophthalmology, SUNY Upstate Medical University, Syracuse, NY, USA.

Iscience
|February 2, 2026
PubMed
Summary
This summary is machine-generated.

Connexin 36 (Cx36) gap junctions in the retina play distinct roles in dim light vision. Removing Cx36 in the outer retina improves visual thresholds, while removing it from both inner and outer retina impairs vision.

Keywords:
cell biologymolecular biologysensory neuroscience

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Cut-loading: A Useful Tool for Examining the Extent of Gap Junction Tracer Coupling Between Retinal Neurons
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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cell Biology

Background:

  • Gap junctions are crucial for neural communication, particularly in sensory systems like the retina.
  • Connexin 36 (Cx36) gap junctions integrate visual information across space and time.
  • The specific roles of Cx36 in the inner and outer retina regarding dim light vision remain unclear.

Purpose of the Study:

  • To investigate how Cx36 gap junctions in the inner and outer retina influence visual thresholds under dim light conditions.
  • To elucidate the distinct contributions of Cx36 in different retinal layers to visual perception.

Main Methods:

  • Utilized transgenic mouse models with targeted Cx36 gene deletion.
  • Employed an operant behavioral assay to measure visual performance.
  • Applied psychophysical modeling to analyze visual thresholds.

Main Results:

  • Visual thresholds plateaued at approximately 2 × 10-4 ph/μm2/s for flash durations >0.5 s.
  • Cx36 removal in the outer retina decreased visual thresholds by 2.6-fold.
  • Cx36 removal in both inner and outer retina increased visual thresholds by 16.5-fold.
  • Visual thresholds in Cx36 knockout mice were rod-mediated, likely via the OFF-rod pathway.

Conclusions:

  • Both inner and outer retinal Cx36 play significant roles in controlling visual thresholds under dim light.
  • Cx36 in the outer retina appears to modulate visual sensitivity, while its presence in both layers is essential for normal dim light vision.