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Development and Function of the Cardiac Conduction System in Health and Disease

机译:心脏传导系统在健康和疾病中的发展和功能

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The generation and propagation of the cardiac impulse is the central function of the cardiac conduction system (CCS). Impulse initiation occurs in nodal tissues that have high levels of automaticity, but slow conduction properties. Rapid impulse propagation is a feature of the ventricular conduction system, which is essential for synchronized contraction of the ventricular chambers. When functioning properly, the CCS produces ~2.4 billion heartbeats during a human lifetime and orchestrates the flow of cardiac impulses, designed to maximize cardiac output. Abnormal impulse initiation or propagation can result in brady- and tachy-arrhythmias, producing an array of symptoms, including syncope, heart failure or sudden cardiac death. Underlying the functional diversity of the CCS are gene regulatory networks that direct cell fate towards a nodal or a fast conduction gene program. In this review, we will discuss our current understanding of the transcriptional networks that dictate the components of the CCS, the growth factor-dependent signaling pathways that orchestrate some of these transcriptional hierarchies and the effect of aberrant transcription factor expression on mammalian conduction disease.
机译:心脏冲动的产生和传播是心脏传导系统(CCS)的核心功能。脉冲启动发生在具有高水平自动化性但传导特性较慢的淋巴结组织中。快速的脉冲传播是心室传导系统的特征,这对于心室腔的同步收缩至关重要。如果功能正常,CCS在人类一生中会产生约24亿次心跳,并协调心脏冲动的流量,旨在最大化心输出量。冲动的开始或传播异常会导致心律不齐和速动性心律失常,产生一系列症状,包括晕厥,心力衰竭或心源性猝死。 CCS功能多样性的基础是基因调控网络,该基因调控网络将细胞命运导向节点或快速传导基因程序。在这篇综述中,我们将讨论目前对决定CCS组成部分的转录网络的理解,协调某些转录层次结构的依赖生长因子的信号传导途径以及异常转录因子表达对哺乳动物传导疾病的影响。

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