Optimal estimation of ion-channel kinetics from macroscopic currents.

Optimal estimation of ion-channel kinetics from macroscopic currents.
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从宏观电流对离子通道动力学的优化估计

DOI:
10.1371/journal.pone.0035208
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Ding J
Ding J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang W;Xiao F;Zeng X;Yao J;Yuchi M;Ding J

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马尔可夫模型为离子通道动力学建模提供了一种有效的方法。有几种搜索算法用于在不同实验条件下全局拟合宏观或单通道电流。在这里,我们提出了一种基于粒子群优化(PSO)的方法,当与黄金分割搜索(GSS)结合使用时,可以在台式计算机上以较高的精度(误差在1%以内)和合理的计算时间(20个自由参数小于10小时)来拟合宏观电压响应。我们还描述了一种方法的初始值估计的模型参数,这似乎有利于识别的全局最优值,可以进一步减少计算成本。PSO-GSS算法适用于任意拓扑结构和大小的动力学模型,并与常用的刺激方案兼容,为建立宏观水平的动力学模型提供了一种方便的方法。
Markov modeling provides an effective approach for modeling ion channel kinetics. There are several search algorithms for global fitting of macroscopic or single-channel currents across different experimental conditions. Here we present a particle swarm optimization(PSO)-based approach which, when used in combination with golden section search (GSS), can fit macroscopic voltage responses with a high degree of accuracy (errors within 1%) and reasonable amount of calculation time (less than 10 hours for 20 free parameters) on a desktop computer. We also describe a method for initial value estimation of the model parameters, which appears to favor identification of global optimum and can further reduce the computational cost. The PSO-GSS algorithm is applicable for kinetic models of arbitrary topology and size and compatible with common stimulation protocols, which provides a convenient approach for establishing kinetic models at the macroscopic level.
DOI: 10.1529/biophysj.103.038679
发表时间: 2004-06-01
影响因子: 3.4
作者:
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