Promoter analysis of ventricular myosin heavy chain (vmhc) in zebrafish embryos.

Promoter analysis of ventricular myosin heavy chain (vmhc) in zebrafish embryos.
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DOI:
10.1002/dvdy.22000
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发表时间:
2009-07
影响因子:
2.5
通讯作者:
Zhong, Tao P.
Zhong, Tao P.
中科院分区:
生物学3区
文献类型:
--
作者:
Jin, Daqing;Ni, Terri T.;Hou, Jia;Rellinger, Eric;Zhong, Tao P.

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在斑马鱼中,心室肌球蛋白重链(vmhc)基因最初在前外侧中胚层表达,此后其表达仅限于心室。调节肌球蛋白重链的室特异性表达的转录控制机制还没有很好的定义。我们分离并分析了斑马鱼vmhc上游区,利用转基因和瞬时表达技术研究了vmhc的时空调控。启动子缺失分析确定了一个足以驱动心室中vmhc表达的基础启动子区域和一个抑制心房中异位vmhc表达所需的上游片段。阻止心房中vmhc表达的转录机制通过Nkx2.5结合元件(NKE)介导。我们进一步发现,配对相关同源框转录因子2(Prx 2/S8)样结合元件是促进vmhc表达所必需的,Prrx 1b,一种Prx相关同源框蛋白,与其他转录因子一起参与vmhc表达的调控。
In zebrafish, ventricular myosin heavy chain (vmhc) gene is initially expressed at the anterior lateral mesoderm, thereafter its expression is restricted to the cardiac ventricle. The transcriptional control mechanisms in regulating chamber-specific expression of myosin heavy chains are not well defined. We isolated and analyzed zebrafish vmhc upstream region to examine the spatial and temporal regulation of vmhc using transgenic and transient expression techniques. Promoter deletion analyses defined a basal promoter region sufficient to drive vmhc expression in the ventricle and an upstream fragment necessary for repressing ectopic vmhc expression in the atrium. The transcriptional mechanism that prevents vmhc expression in the atrium is mediated through Nkx2.5 binding elements (NKE). We have further discovered that paired-related homeobox transcriptional factor 2 (Prx2/S8)-like binding elements are required for promoting vmhc expression, and Prrx1b, a Prx-related homeobox protein, participates in the regulation of vmhc expression with other transcriptional factors.
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