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Life at Low Copy Number: How Dendrites Manage with So Few mRNAs

机译:低拷贝数的生活:很少有mRNA的树突如何处理

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摘要

Most mammalian dendrites have surprisingly few copy numbers of mRNAs relative to the large number of synapses and consequently, at any given moment, the majority of synapses do not have a repertoire of mRNAs within their immediate locale capable of initiating translation-dependent plasticity. The dimensions of the translationally serviceable locale around synapses have boundary parameters that can be estimated. When a synapse receives an input beyond that boundary, the requisite mRNAs for local translation and plasticity may not be there. How a complex dendritic arbor optimizes this paucity of mRNAs opens several functional considerations that are related to the dynamic range of dendritic plasticity, sparse coding, and modifications of firing rates. RNA localization in dendrites may instantiate a neuron's history and establishes a bias toward inputs that synapse on RNA-laden synaptic clusters. Low copy numbers create an element of stochasticity to the induction of translation-dependent plasticity that allows the dendrite opportunities to respond to novel and unexpected inputs.
机译:相对于大量突触,大多数哺乳动物树突具有令人惊讶的很少数量的mRNA拷贝数,因此,在任何给定时刻,大多数突触在其直接区域内都没有能够启动翻译依赖性可塑性的mRNA组成。突触周围可翻译服务的语言环境的大小具有可以估计的边界参数。当突触接收到超出该边界的输入时,可能不存在本地翻译和可塑性所需的mRNA。复杂的树突状乔木如何优化这种稀疏的mRNA带来了一些功能上的考虑,这些因素与树突可塑性的动态范围,稀疏编码和发射速率的改变有关。树突状细胞中的RNA定位可能会实例化神经元的历史,并向在带有RNA的突触簇上突触的输入建立偏见。低拷贝数会导致随机性,从而导致依赖翻译的可塑性,从而使枝晶机会有机会响应新颖而出乎意料的输入。

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