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首页> 外文期刊>Journal of Computational Neuroscience >Relating ion channel expression, bifurcation structure, and diverse firing patterns in a model of an identified motor neuron
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Relating ion channel expression, bifurcation structure, and diverse firing patterns in a model of an identified motor neuron

机译:在已识别的运动神经元模型中与离子通道表达,分叉结构和多种激发模式相关

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摘要

Neurons show diverse firing patterns. Even neurons belonging to a single chemical or morphological class, or the same identified neuron, can display different types of electrical activity. For example, motor neuron MN5, which innervates a flight muscle of adult Drosophila, can show distinct firing patterns under the same recording conditions. We developed a two-dimensional biophysical model and show that a core complement of just two voltage-gated channels is sufficient to generate firing pattern diversity. We propose Shab and DmNa_v to be two candidate genes that could encode these core currents, and find that changes in Shab channel expression in the model can reproduce activity resembling the main firing patterns observed in MN5 recordings. We use bifurcation analysis to describe the different transitions between rest and spiking states that result from variations in Shab channel expression, exposing a connection between ion channel expression, bifurcation structure, and firing patterns in models of membrane potential dynamics.
机译:神经元显示出多种放电模式。甚至属于单个化学或形态学类别的神经元,或相同的已识别神经元,也可以显示不同类型的电活动。例如,支配成年果蝇的飞行肌肉的运动神经元MN5在相同的记录条件下可以显示出不同的发射模式。我们开发了二维生物物理模型,并表明仅两个电压门控通道的核心互补就足以产生点火模式多样性。我们提出Shab和DmNa_v是可以编码这些核心电流的两个候选基因,并发现模型中Shab通道表达的变化可以复制类似于MN5录音中观察到的主要触发模式的活动。我们使用分叉分析来描述静息状态和尖峰状态之间的不同过渡,这些变化是由Shab通道表达的变化引起的,从而揭示了离子通道表达,分叉结构和膜电位动力学模型中的发射模式之间的联系。

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