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Related Concept Videos

Fusion of Secretory Vesicles with the Plasma Membrane01:26

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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
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Exocytosis is a process that releases molecules outside the cell. Like other bulk transport mechanisms, exocytosis requires energy.
Exocytosis is the opposite of endocytosis, which brings molecules inside the cell. Sometimes, the released materials are signaling molecules. For example, neurons typically use exocytosis to release neurotransmitters. Cells also use exocytosis to insert proteins such as ion channels into their cell membranes, secrete proteins for use in the extracellular matrix, or...
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When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
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Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
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Nervous tissue is a vital component of the human body's communication system, enabling us to perceive and respond to stimuli. However, like all other tissues, it is vulnerable to disorders and diseases that can significantly impact our neurological functioning.
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Vesicular transport is a cellular process that encompasses the engulfment of particles or dissolved substances by cells. It involves endocytosis, transcytosis, and exocytosis.
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Updated: Aug 2, 2025

Quantitative Approaches for Scoring in vivo Neuronal Aggregate and Organelle Extrusion in Large Exopher Vesicles in C. elegans
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The exocyst complex in neurological disorders.

Dilara O Halim1,2, Mary Munson3, Fen-Biao Gao4,5

  • 1Department of Neurology, University of Massachusetts Chan Medical School, Worcester, MA, USA. Dilara.Halim@umassmed.edu.

Human Genetics
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Summary
This summary is machine-generated.

The exocyst complex controls vesicle fusion for cellular functions. Mutations in exocyst genes cause neurodevelopmental disorders and ciliopathies, highlighting its critical role in human health.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Exocytosis is a fundamental cellular process involving vesicle fusion with the plasma membrane.
  • The exocyst complex, an octameric protein assembly, regulates SNARE complex formation for vesicle tethering and fusion.
  • The exocyst is involved in numerous cellular processes, including membrane trafficking, cell polarity, and migration.

Purpose of the Study:

  • To review mutations and variants in exocyst subunits linked to human diseases.
  • To discuss the implications of exocyst dysfunction in various disorders.
  • To highlight the exocyst's role in cell viability and development.

Main Methods:

  • Literature review of studies on exocyst function and human disease associations.
  • Analysis of genetic mutations and variants in exocyst subunits.
  • Synthesis of information on the phenotypic consequences of exocyst dysfunction.

Main Results:

  • Mutations in exocyst subunits are implicated in human diseases, primarily neurodevelopmental disorders and ciliopathies.
  • These diseases often present with developmental delay, intellectual disability, and brain abnormalities.
  • Exocyst subunits are essential for cell viability.

Conclusions:

  • Exocyst complex dysfunction contributes to a range of human diseases, particularly those affecting development.
  • Understanding exocyst variants is crucial for diagnosing and potentially treating associated disorders.
  • Further research into exocyst roles may uncover links to other pathologies.