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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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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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Induction of an Isoelectric Brain State to Investigate the Impact of Endogenous Synaptic Activity on Neuronal Excitability In Vivo
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一个转录基因轴预测皮层内部神经元的状态调制.

Stéphane Bugeon1, Joshua Duffield2, Mario Dipoppa2,3

  • 1UCL Queen Square Institute of Neurology, University College London, London, UK. s.bugeon@ucl.ac.uk.

Nature
|July 6, 2022
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概括

皮层抑制神经元亚型表现出多样化的大脑活动模式,主要由它们的分子形状来组织. 这种分子组织有助于解释这些多样化的神经元如何影响视觉皮层中的大脑状态.

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科学领域:

  • 神经科学是一个神经科学.
  • 分子生物学分子生物学
  • 系统神经科学 系统神经科学

背景情况:

  • 转录学揭示了皮层抑制神经元之间广泛的分子多样性.
  • 这种分子多样性对神经元活动的功能影响在体内仍然在很大程度上是未知的.

研究的目的:

  • 为了调查主要视觉皮层 (V1) 中的抑制神经元的多种分子亚型是否在体内表现出不同的活动模式.
  • 确定分子变异如何与神经元功能和大脑状态调制有关.

主要方法:

  • 结合了小鼠V1的体内两光子成像,并对已识别的神经元进行了转录基因分析.
  • 基于基因表达的基层系统 (子类,类型,亚型) 将抑制性神经元分类.
  • 分析神经元对视觉刺激的反应和大脑状态的调制.

主要成果:

  • 抑制性神经元亚型显示出多样化的大脑状态相关性,由转录组变异的主要轴组织.
  • 视觉刺激反应主要在子类水平上有所不同,Sncg中抑制,Sncg中激发.
  • 大脑状态调制可以从主要的转录基因轴中预测,与像尖峰宽度和轴突投射模式这样的细胞特性相关.

结论:

  • 一个单一的转录基因原理在很大程度上组织了V1.1中抑制性神经元亚型的多样化活动模式.
  • 这一原则将分子身份与状态依赖的皮层处理中的不同功能角色联系在一起.