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A Noisy Analog-to-Digital Converter Connects Cytosolic Calcium Bursts to Transcription Factor Nuclear Localization Pulses in Yeast

机译:嘈杂的模数转换器将胞质钙爆发与酵母中的转录因子核定位脉冲相连

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摘要

Several examples of transcription factors that show stochastic, unsynchronized pulses of nuclear localization have been described. Here we show that under constant calcium stress, nuclear localization pulses of the transcription factor Crz1 follow stochastic variations in cytosolic calcium concentration. We find that the size of the stochastic calcium bursts is positively correlated with the number of subsequent Crz1 pulses. Based on our observations, we propose a simple stochastic model of how the signaling pathway converts a constant external calcium concentration into a digital number of Crz1 pulses in the nucleus, due to the time delay from nuclear transport and the stochastic decoherence of individual Crz1 molecule dynamics. We find support for several additional predictions of the model and suggest that stochastic input to nuclear transport may produce noisy digital responses to analog signals in other signaling systems.
机译:已经描述了显示随机的,不同步的核定位脉冲的转录因子的几个例子。在这里,我们显示出在恒定的钙胁迫下,转录因子Crz1的核定位脉冲遵循胞质钙浓度的随机变化。我们发现,随机钙爆发的大小与后续Crz1脉冲的数量呈正相关。基于我们的观察,我们提出了一个简单的随机模型,该模型是信号传导途径如何将恒定的外部钙浓度转换为原子核中Crz1脉冲的数字数量的原因,这是由于核传输的时间延迟和单个Crz1分子动力学的随机去相干性。我们找到了对该模型的其他几个预测的支持,并建议对核运输的随机输入可能会对其他信号系统中的模拟信号产生嘈杂的数字响应。

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