Vertebrate limb bud formation is initiated by localized epithelial-to-mesenchymal transition.

Vertebrate limb bud formation is initiated by localized epithelial-to-mesenchymal transition.
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DOI:
10.1126/science.1248228
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发表时间:
2014-03-14
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Tabin CJ
Tabin CJ
中科院分区:
其他
文献类型:
--
作者:
Gros J;Tabin CJ

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脊椎动物的四肢最初是在沿着树干的特定位置上以小芽的形式出现的。虽然我们对肢体发育和生长的分子调控有相当多的了解,但这些过程背后的细胞事件仍然不太清楚。我们发现,间充质肢体祖细胞出现通过本地化上皮间充质转化(EMT)的体腔上皮细胞特别是在假定的肢体领域。这种EMT至少部分受Tbx5和Fgf10的调节,这两个基因已知控制肢体起始。这项工作表明,肢芽比以前认为的更早开始,作为局部EMT的结果,而不是差异增殖率。
Vertebrate limbs first emerge as small buds at specific locations along the trunk. Although a fair amount is known about the molecular regulation of limb initiation and outgrowth, the cellular events underlying these processes have remained less clear. We show that the mesenchymal limb progenitors arise through localized Epithelial-to-Mesenchymal Transition (EMT) of the coelomic epithelium specifically within the presumptive limb fields. This EMT is regulated at least in part by Tbx5 and Fgf10, two genes known to control limb initiation. This work shows that limb buds initiate earlier than previously thought, as a result of localized EMT rather than differential proliferation rates.
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