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Related Concept Videos

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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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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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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The Role of Ion Channels in Neuronal Computation01:19

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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
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Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors
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Mechanisms regulating GABAergic neuron development.

Kaia Achim1, Marjo Salminen, Juha Partanen

  • 1EMBL Heidelberg, Meyerhofstr. 1, 69117, Heidelberg, Germany, kaia.achim@embl.de.

Cellular and Molecular Life Sciences : CMLS
|November 8, 2013
PubMed
Summary
This summary is machine-generated.

Gamma-aminobutyric acid (GABA) neurons are key inhibitory cells in the central nervous system (CNS). This review details gene regulation in GABAergic neuron development across CNS regions, revealing distinct molecular toolkits for cell fate determination.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Molecular Biology

Background:

  • Gamma-aminobutyric acid (GABA) neurons are the primary inhibitory neurons in the central nervous system (CNS).
  • These neurons exhibit significant diversity in morphology and function.
  • GABAergic neuron development involves complex gene expression and regulatory mechanisms across discrete neuroepithelial regions.

Purpose of the Study:

  • To review gene expression and regulatory mechanisms governing GABAergic neuron development.
  • To compare molecular regulation across different CNS regions.
  • To identify core determinants and sources of diversity in GABAergic neuron generation.

Main Methods:

  • Comparative analysis of gene expression patterns.
  • Review of regulatory mechanisms controlling neuroepithelial patterning, precursor production, identity establishment, and migration.
  • Categorization of CNS regions based on molecular toolkits for GABAergic fate determination.

Main Results:

  • Identification of three main CNS regions with distinct molecular toolkits for GABAergic neuron development: telencephalon-anterior diencephalon (DLX2 type), posterior diencephalon-midbrain (GATA2 type), and hindbrain-spinal cord (PTF1A and TAL1 types).
  • Elucidation of similarities and differences in molecular regulation across these regions.
  • Insights into the fundamental determinants of GABAergic neuron identity.

Conclusions:

  • Distinct molecular toolkits govern GABAergic neuron development in different CNS regions.
  • Understanding these mechanisms is crucial for deciphering the generation of GABAergic neuron diversity.
  • This comparative approach highlights conserved and divergent pathways in CNS development.