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Related Concept Videos

Neural Circuits01:25

Neural Circuits

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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
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Neuronal Communication01:28

Neuronal Communication

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Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
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The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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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.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
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Neurons: The Axon01:21

Neurons: The Axon

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Axons are long, cytoplasmic processes of nerve cells capable of propagating electrical impulses known as action potentials. The cytoplasm or axoplasm of an axon contains neurofibrils, neurotubules, small vesicles, lysosomes, mitochondria, and various enzymes, all encased within the axolemma, the plasma membrane of the axon.
The axon attaches to the cell body at a cone-shaped elevation called the axon hillock. The initial part of the axon, closest to the hillock, is known as the initial segment....
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Neurons as Communicators of the Brain01:22

Neurons as Communicators of the Brain

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Neurons, the fundamental units of the brain and nervous system, function as the primary transmitters of information throughout the body. Their ability to communicate through electrical and chemical signals is vital for every bodily function, from regulating the heartbeat to processing complex thoughts. Each neuron has three main components: the cell body (soma), dendrites, and an axon, each specialized to facilitate swift and efficient neural communication.
Cell Body
The cell body, also known...
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Excitatory and Inhibitory Effects of Neurotransmitters01:29

Excitatory and Inhibitory Effects of Neurotransmitters

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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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Closed-loop Neuro-robotic Experiments to Test Computational Properties of Neuronal Networks
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ExBoX - a simple Boolean exclusion strategy to drive expression in neurons.

Teresa Ubina1, Tyler Vahedi-Hunter1, Will Agnew-Svoboda1

  • 1Neuroscience Graduate Program, Department of Molecular, Cell & Systems Biology, University of California, Riverside, CA 92521, USA.

Journal of Cell Science
|September 13, 2021
PubMed
Summary

Researchers developed a new genetic tool, Expression by Boolean EXclusion (ExBoX), using adeno-associated virus (AAV) vectors. This system precisely targets gene expression in specific cell types by combining recombinase inputs, advancing single-cell biology research.

Keywords:
Adeno-Associated VirusBoolean logicCombinatorial expressionCreFlpIntersectional approachesRecombinases

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Area of Science:

  • Molecular Biology
  • Genetics
  • Neuroscience

Background:

  • Single-cell biology reveals significant molecular diversity in cell populations.
  • Understanding cellular heterogeneity requires advanced genetic tools for functional analysis.
  • Intersectional genetic approaches are crucial for dissecting complex cell types.

Purpose of the Study:

  • To develop a novel adeno-associated virus (AAV)-based system for precise gene expression control.
  • To enable the definition of specific cell subpopulations using Boolean exclusion logic (AND NOT).
  • To create a versatile tool for cell- and time-specific gene delivery.

Main Methods:

  • Developed the Expression by Boolean EXclusion (ExBoX) system using AAV vectors.
  • Engineered ExBoX to utilize recombinase activity (Cre or FlpO) for conditional gene activation and inactivation.
  • Validated ExBoX for regulating fluorescent reporter gene expression in vitro and in vivo.

Main Results:

  • Demonstrated tight regulation of gene expression using the ExBoX system.
  • Successfully achieved specific gene expression in targeted cell populations in vitro and in vivo.
  • Showcased the system's adaptability by expressing various coding sequences in the mouse brain.

Conclusions:

  • The ExBoX system provides a simple yet powerful method for Boolean logic-based gene expression.
  • This AAV-based strategy enhances the ability to probe cellular heterogeneity.
  • ExBoX expands the molecular toolkit for sophisticated genetic manipulation in diverse biological systems.