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Related Concept Videos

Synaptic Signaling01:12

Synaptic Signaling

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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
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Synaptic Signaling01:09

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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
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Integration of Synaptic Events01:28

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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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The Synapse02:47

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Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Related Experiment Video

Updated: Jan 30, 2026

Studying Synaptic Vesicle Pools using Photoconversion of Styryl Dyes
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Unc13: a multifunctional synaptic marvel.

Jeremy S Dittman1

  • 1Department of Biochemistry, Weill Cornell Medical College, New York, NY 10065, United States.

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PubMed
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This summary is machine-generated.

Unc13 proteins are crucial hubs coordinating synaptic transmission by regulating fusion and release. This review explores Unc13

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Synaptic connections are fundamental to nervous system function.
  • Recent advances in genetics, molecular biology, physiology, and biochemistry have enhanced understanding of synaptic function.
  • The presynaptic terminal utilizes a conserved fusion apparatus involving key proteins.

Purpose of the Study:

  • To review the diverse functions of Unc13 proteins in synaptic transmission.
  • To highlight Unc13's role as a central coordinator of presynaptic events.
  • To summarize recent research on Unc13's involvement in specific synaptic processes.

Main Methods:

  • Literature review of recent studies on Unc13.
  • Analysis of Unc13's roles in protein interactions and cellular machinery.
  • Synthesis of findings related to synaptic vesicle release and plasticity.

Main Results:

  • Unc13 acts as a central hub coordinating presynaptic functions.
  • Unc13 plays critical roles in SNARE complex assembly and quality control.
  • Unc13 influences release site formation, calcium channel proximity, and short-term synaptic plasticity.

Conclusions:

  • Unc13 is essential for efficient and regulated synaptic transmission.
  • Understanding Unc13 function provides insights into the molecular mechanisms of neurotransmitter release.
  • Further research on Unc13 will illuminate synaptic plasticity and neurological disorders.