Mosaic hoxb4a neuronal pleiotropism in zebrafish caudal hindbrain.

Mosaic hoxb4a neuronal pleiotropism in zebrafish caudal hindbrain.
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DOI:
10.1371/journal.pone.0005944
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发表时间:
2009-06-17
期刊:
影响因子:
3.7
通讯作者:
Baker R
Baker R
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ma LH;Punnamoottil B;Rinkwitz S;Baker R

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为了更好地了解个体基因和经验如何影响行为,通过斑马鱼增强子-陷阱YFP系中尾部后脑神经元的克隆和逆行荧光标记,在体内全面分析了单个同源异型单位hoxb 4a的作用。一个定量的时空神经元图谱显示hoxb 4a活性是高度可变的和马赛克在菱形7-8网状,运动神经元和小脑前核的表达减少差异,通过青少年阶段的所有亚组。广泛的Hox嵌合体和广泛的多效性表明,相同的转录蛋白在驱动从自主神经到运动功能(包括小脑调节)的行为的回路的发育中起作用。我们认为,hoxb 4a阳性神经元的持续存在可能为行为特异性回路提供发育可塑性,以适应经验和生长相关的变化。因此,无处不在的hoxb 4a多亲性和模块性可能提供了一个适应性转录元件的电路修改在生长和进化。
To better understand how individual genes and experience influence behavior, the role of a single homeotic unit, hoxb4a, was comprehensively analyzed in vivo by clonal and retrograde fluorescent labeling of caudal hindbrain neurons in a zebrafish enhancer-trap YFP line. A quantitative spatiotemporal neuronal atlas showed hoxb4a activity to be highly variable and mosaic in rhombomere 7–8 reticular, motoneuronal and precerebellar nuclei with expression decreasing differentially in all subgroups through juvenile stages. The extensive Hox mosaicism and widespread pleiotropism demonstrate that the same transcriptional protein plays a role in the development of circuits that drive behaviors from autonomic through motor function including cerebellar regulation. We propose that the continuous presence of hoxb4a positive neurons may provide a developmental plasticity for behavior-specific circuits to accommodate experience- and growth-related changes. Hence, the ubiquitous hoxb4a pleitropism and modularity likely offer an adaptable transcriptional element for circuit modification during both growth and evolution.
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