EMX2 activates slow myosin heavy chain 2 gene expression in embryonic muscle fibers.

EMX2 activates slow myosin heavy chain 2 gene expression in embryonic muscle fibers.
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DOI:
10.1016/j.mod.2017.06.006
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发表时间:
2017-10
影响因子:
2.6
通讯作者:
DiMario JX
DiMario JX
中科院分区:
生物学4区
文献类型:
--
作者:
Hatch K;Pabon A;DiMario JX

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禽类肌肉发生的部分特征是不同的成肌细胞谱系致力于形成特定类型的肌肉纤维。以往的研究已证实,转录因子EMX2是快/慢初级肌纤维中慢肌球蛋白重链2(MyHC2)基因表达的调节因子。我们在这里报道了EMX2与快/慢胚胎肌肉纤维中慢速MyHC2转录调节区的相互作用。启动子活性和电子迁移率分析将EMX2与慢速MyHC2基因相互作用的部位定位在克隆的慢速MyHC2 DNA转录调控区3‘端3336-3326bp之间的一个确定的结合部位内。利用克隆来源的成肌细胞稳定地形成快/慢肌纤维,我们还报道了EMX2基因表达的变化对这些成肌细胞内全基因组基因表达的影响。在快/慢成肌细胞中EMX2基因表达增加导致1185个基因表达改变,表明EMX2在胚胎成肌细胞的基因表达谱中起核心作用。
Avian myogenesis is partly characterized by commitment of distinct myoblast cell lineages to the formation of specific muscle fiber types. Previous studies have identified the transcription factor EMX2 as a regulator of slow myosin heavy chain 2 (MyHC2) gene expression in fast/slow primary muscle fibers. We report here the interaction of EMX2 with the slow MyHC2 transcriptional regulatory region in fast/slow embryonic muscle fibers. Promoter activity and electromobility shift assays localized the site of interaction of EMX2 with the slow MyHC2 gene within a defined binding site located between 3336-3326bp from the 3′ end of the cloned slow MyHC2 DNA containing the transcriptional regulatory region. Using clonally-derived myoblasts stably committed to the formation of fast/slow muscle fibers, we also report the effect of altered EMX2 gene expression on genome-wide gene expression within these myoblasts. Increased EMX2 gene expression in fast/slow myoblasts caused altered gene expression of 1185 genes, indicating that EMX2 plays a central role in the gene expression profile of embryonic myoblasts.
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